Electroacupuncture attenuates cerebral hypoxia and neuronal apoptosis induced by cerebral ischemia/reperfusion injury.To further identify the involved mechanisms,we assumed that electroacupuncture used to treat cerebr...Electroacupuncture attenuates cerebral hypoxia and neuronal apoptosis induced by cerebral ischemia/reperfusion injury.To further identify the involved mechanisms,we assumed that electroacupuncture used to treat cerebral ischemia/reperfusion injury was associated with the p38 mitogen-activated protein kinase(MAPK) signaling pathway.We established rat models of cerebral ischemia/reperfusion injury using the modified Zea-Longa's method.At 30 minutes before model establishment,p38 MAPK blocker SB20358 was injected into the left lateral ventricles.At 1.5 hours after model establishment,electroacupuncture was administered at acupoints of Chize(LU5),Hegu(LI4),Zusanli(ST36),and Sanyinjiao(SP6) for 20 minutes in the affected side.Results showed that the combination of EA and SB20358 injection significantly decreased neurologic impairment scores,but no significant differences were determined among different interventional groups.Hematoxylin-eosin staining also showed reduced brain tissue injuries.Compared with the SB20358 group,the cells were regularly arranged,the structures were complete,and the number of viable neurons was higher in the SB20358 + electroacupuncture group.Terminal deoxynucleotidyl transferase(Td T)-mediated d UTP nick-end labeling assay showed a decreased apoptotic index in each group,with a significant decrease in the SB20358 + electroacupuncture group.Immunohistochemistry revealed reduced phosphorylated p38 expression at 3 days in the electroacupuncture group and SB20358 + electroacupuncture group compared with the ischemia/reperfusion group.There was no significant difference in phosphorylated p38 expression between the ischemia/reperfusion group and SB20358 group.These findings confirmed that the electroacupuncture effects on mitigating cerebral ischemia/reperfusion injury are possibly associated with the p38 MAPK signaling pathway.A time period of 3 days could promote the repair of ischemic cerebral nerves.展开更多
Mitogen-activated protein kinases(MAPKs)are a family of proteins that constitute signaling pathways involved in processes that control gene expression,cell division, cell survival,apoptosis,metabolism,differentiation ...Mitogen-activated protein kinases(MAPKs)are a family of proteins that constitute signaling pathways involved in processes that control gene expression,cell division, cell survival,apoptosis,metabolism,differentiation and motility.The MAPK pathways can be divided into conventional and atypical MAPK pathways.The first group converts a signal into a cellular response through a relay of three consecutive phosphorylation events exerted by MAPK kinase kinases,MAPK kinase,and MAPK.Atypical MAPK pathways are not organized into this three-tiered cascade.MAPK that belongs to both conventional and atypical MAPK pathways can phosphorylate both non-protein kinase substrates and other protein kinases.The latter are referred to as MAPK-activated protein kinases.This review focuses on one such MAPK-activated protein kinase,MAPK-activated protein kinase 5(MK5)or p38-regulated/activated protein kinase(PRAK).This protein is highly conserved throughout the animal kingdom and seems to be the target of both conventional and atypical MAPK pathways.Recent findings on the regulation of the activity and subcellular localization,bona fide interaction partners and physiological roles of MK5/PRAK are discussed.展开更多
Recent studies have shown that varied stress stimuli activate c-Jun N-terminal kinase (JNK), protein kinase B (Akt), and p38 mitogen-activated protein kinase (p38) signal transduction pathway, and also regulate ...Recent studies have shown that varied stress stimuli activate c-Jun N-terminal kinase (JNK), protein kinase B (Akt), and p38 mitogen-activated protein kinase (p38) signal transduction pathway, and also regulate various apoptotic cascades. JNK and p38 promote apoptosis, but Akt protects against apoptosis, in hippocampal neurons. However, changes in the transduction pathway in different regions of brain tissues in a chronic stress rat model of depression remain poorly understood. Results from this study showed that JNK phosphorylation levels were significantly greater in the stress group hippocampus compared with the control group (P 〈 0.05). No significant difference in JNK phosphorylation levels was detected in the rat cerebral cortex between stress and control groups, and no significant difference in Akt and p38 phosphorylation levels was detected in the rat hippocampus and cerebral cortex between stress and control groups (P 〉 0.05). These results suggested that the JNK signal pathway is activated by JNK phosphorylation and participates in pathophysiological changes in rat models of depression.展开更多
Cerebral ischemia was induced using photothrombosis 1 hour after intraperitoneal injection of the p38 mitogen-activated protein kinase (MAPK) inhibitor $B239063 into Swedish mutant amyloid precursor protein (APP/SW...Cerebral ischemia was induced using photothrombosis 1 hour after intraperitoneal injection of the p38 mitogen-activated protein kinase (MAPK) inhibitor $B239063 into Swedish mutant amyloid precursor protein (APP/SWE) transgenic and non-transgenic mice. The number of surviving neurons in the penumbra was quantified using Nissl staining, and the activity of p38 MAPKs was measured by western blotting. The number of surviving neurons in the penumbra was significantly reduced in APP/SWE transgenic mice compared with non-transgenic controls 7 days after cerebral ischemia, but the activity of p38 MAPKs was significantly elevated compared with the non-ischemic hemisphere in the APP/SWE transgenic mice. SB239063 prevented these changes. The APP/SWE mutation exacerbated ischemic brain injury, and this could be alleviated by inhibiting p38 MAPK activity.展开更多
Tuina is a traditional Chinese treatment for sensory disturbances caused by peripheral nerve injury and related diseases. Our previous studies showed that tuina regulates relevant regions and indices of the spinal dor...Tuina is a traditional Chinese treatment for sensory disturbances caused by peripheral nerve injury and related diseases. Our previous studies showed that tuina regulates relevant regions and indices of the spinal dorsal horn using the Dian, Bo, and Rou method in Yinmen(BL37), Yanglingquan(GB34), and Weizhong(BL40). Treatment prevents muscle atrophy, protects spinal cord neurons, and promotes sciatic nerve repair. The mechanisms of action of tuina for treating peripheral nerve injury remain poorly understood. This study established rat models of sciatic nerve injury using the crushing method. Rats received Chinese tuina in accordance with the principle of "Three Methods and Three Points," once daily for 20 days. Tuina intervention reduced paw withdrawal latency and improved wet weight of the gastrocnemius muscle, as well as promoting morphological recovery of sciatic nerve fibers, Schwann cells, and axons. The protein expression levels of phospho-p38 mitogen-activated protein kinase, tumor necrosis factor-α, and interleukin-1β also decreased. These findings indicate that "Three Methods and Three Points" promoted morphological recovery and improved behavior of rats with peripheral nerve injury.展开更多
BACKGROUND: Activated N-methyl-D-aspartate (NMDA) receptor is involved in the formation of chronic neuropathic pain, and its antagonist, ketamine, exhibits effective amelioration of diabetic neuropathic pain (DNP...BACKGROUND: Activated N-methyl-D-aspartate (NMDA) receptor is involved in the formation of chronic neuropathic pain, and its antagonist, ketamine, exhibits effective amelioration of diabetic neuropathic pain (DNP). However, the mechanisms of NMDA receptor participation in the formation and maintenance of DNP remain poorly understood. OBJECTIVE: To evaluate the role NMDA receptor plays in DNP and effects on p38 mitogen activated protein kinase (p38 MAPK) in a rat model of DNP. DESIGN, TIME AND SETTING: A randomized, controlled, animal experiment was performed at the Human Embryonic Stem Cell Research Institute of Yunyang Medical College Affiliated Taihe Hospital between July 2005 and September 2007. MATERIALS: Streptozotocin was provided by Sigma, USA; p38 MAPK inhibitor (SB203580) was provided by Shanghai KangChen Biotech, China; NMDA receptor antagonist (MK-801) was purchased from Shanghai Yope Biotech, China. METHODS: A total of 128 healthy, Wistar rats of clean grade, aged 3 months and weighing 180- 220 g, were randomly assigned to 4 groups: control, DNP model, p38 MAPK, and NMDA receptor. Each group contained 32 rats. DNP was established in all groups except for the control group by intraperitoneal injection of streptozocin (65 mg/kg). Subsequently, 1 mg/kg SB203580 and 1 mg/kg MK-801 were injected once each week via intraperitoneal injection in the p38 MAPK and NMDA receptor groups, respectively. MAIN OUTCOME MEASURES: At the end of 2, 4, 6, and 8 weeks following streptozotocin injection, mechanical withdrawal threshold was measured in 8 animals from each group following von Frey filament stimulation. The rats were anesthetized and nerve conduction velocity of the left sciatic nerve was measured. Subsequently, the right sciatic nerve, the lumbar segment of the spinal cord, and dorsal root ganglia were removed from the L3-6 segment for microscopic examination, p38 MAPK expression was determined using immunohistochemistry and Western blot analysis. Expression of NMDA receptor 1 mRNA in dorsal root ganglion and spinal cord neurons was detected using RT-PCR. RESULTS: Mechanical withdrawal threshold and nerve conduction velocity were significantly reduced, and p38 MAPK and NMDA receptor 1 mRNA expression in the spinal cord and dorsal root ganglia were significantly increased, in the model, p38 MAPK, and NMDA receptor groups compared with the control group at all time points (P 〈 0.05). At 4-8 weeks following successful DNP model establishment, SB203580 and MK-801 increased mechanical withdrawal threshold, accelerated nerve conduction velocity, and attenuated p38 MAPK expression, compared with the model group. The NMDA receptor group exhibited downregulated mRNA expression of NMDA receptor 1 compared with the model and p38 MAPK groups (P 〈 0.05). CONCLUSION: NMDA receptor was highly expressed in the brains of DNP rats and was involved in DNP development via activation of the p38 MAPK signal pathway.展开更多
Background Recent studies have suggested that p38 mitogen-activated protein kinases (MAPK) signalling pathway plays an important role in hepatic fibrosis. This study explored the antifibrotic effect of oxymatrine on...Background Recent studies have suggested that p38 mitogen-activated protein kinases (MAPK) signalling pathway plays an important role in hepatic fibrosis. This study explored the antifibrotic effect of oxymatrine on tetrachloromethane induced liver fibrosis in rats and its modulation on the p38 MAPK signalling pathway. Methods One hundred and twenty healthy male Sprague-Dawley rats were randomly assigned to six groups: normal (n=20), induced fibrosis (n=20), colchicine (n=20) and three treatment groups of oxymatrine (n=20x3). We obesrved changes in deposition of collagen, hyaluronic acid (HA), laminin (LN), collagen type IV (CIV), procollagen III (PCIll) and hydroxyproline (Hyp), a-smooth muscle actin (α-SMA) and phosphor-p38 (pp38). Results The relative indicators of changes in histopathology, HA, LN, CIV, PCIII, Hyp, a-SMA and pp38 were raised significantly in the induced fibrosis group (P〈0.01 vs normal group). The semiquantitative hepatic fibrosis staging scores of middle dose group and high dose group were decreased (P 〈0.05 and P 〈0.01 respectively vs the induced fibrosis group), as was the average area of collagen in rats' liver, the concentrations of serum HA, LN, CIV, PCIII and liver tissue homogenate Hyp. The gene expression of α-SMA mRNA was considerably decreased in the treated animals, as was the protein espression of pp38 protein. Conclusions Oxymatrine is effective in reducing the production and deposition of collagen in the liver tissue of experimental rats in ways which relate to modulating the fibrogenic signal transduction via p38 MAPK signalling pathway.展开更多
Background p38 mitogen-activated protein kinases (MAPK) in ischemic preconditioning (IPC) may be essential to cardioprotection. We assessed whether protective effect of morphine-induced preconditioning (MPC) on ...Background p38 mitogen-activated protein kinases (MAPK) in ischemic preconditioning (IPC) may be essential to cardioprotection. We assessed whether protective effect of morphine-induced preconditioning (MPC) on myocardial ischemia and reperfusion injury in rat hearts involved p38 MAPK activation.Methods Male Spargue-Dawley rats (weighing 300--350 g) were randomly assigned to 1 of the following 8 groups: control (CON, saline vehicle, n=9), SB 203580 (SB, a p38 MAPK inhibitor, n=6), MPC (n=6), IPC (n=9), SB+MPC, SB+IPC, MPC+SB, and IPC+SB (n=6). Infarct sizes (IS), a percentage of the area at risk (AAR), were determined by triphenyltetrazolium (TTC) staining. Hssue samples were processed from the entire AAR of left ventricle for the determination of p38 MAPK protein expression (5 hearts/group). The bands representing the proteins were visualized using an enhanced chemiluminescence detection system. Results The IS/AAR was significantly reduced by I PC (12.9±1.6)% or MPC (25.3±2.9)% compared to the control (52.7±5.5)%. SB 203580 administered prior to preconditioning abolished the effect of IPC (SB+IPC: (43.8±2.6)%, P〉0.05 vs CON, P〈0.01 vs IPC), but not MPC (SB+MPC: (30.7±0.9)%, P〈0.01 vs CON, P〉0.05 vs MPC). Treatment with SB 203580 prior to sustained ischemia diminished the protective effect of both MPC (MPC+SB: (42.4±2.9)%, P〉0.05 vs CON) and IPC (IPC+SB: (52.0±2.5)%, P〉0.05 vs CON) on IS/AAR. In the IPC group, phospho-p38 MAPK protein increased significantly within 5 minutes into ischemia and remained elevated at 30 minutes into reperfusion, while phospho-p38 MAPK protein in the MPC group only increased significantly at 30 minutes into reperfusion.Conclusion The activation of p38 MAPK just acts as a mediator of MPC,whereas it acts as both a trigger and a mediator in IPC.展开更多
Objective: Impaired signal transduction is associated with tumorigenesis and progression of various kinds of human cancers. Transforming growth factor (TGF)-beta/Smad and ras-mitogen activated protein kinase (MAPK...Objective: Impaired signal transduction is associated with tumorigenesis and progression of various kinds of human cancers. Transforming growth factor (TGF)-beta/Smad and ras-mitogen activated protein kinase (MAPK) are two major signal transduction pathways for adjusting cell proliferation and differentiation. Little is known about TGF-beta/Smad4 in non-small cell lung cancer (NSCLC). Hereby, we investigated the expression of Smad4 in NSCLC, its correlation with MAPK proteins (including p38, ERK1 and JNK1 proteins) and their clinical significance in NSCLC. Methods: The expressions of Smad4, p38, ERK1 and JNK1 were detected at protein level with Western blotting and immunohistochemistry, at transcription level with RT-PCR. Statistical analysis was performed for the comparisons of expressions of Smad4, p38, ERK1 and JNK1, and their correlation with various clinicopathological parameters and the prognosis of NSCLC. Results: The levels of protein and mRNA expression of Smad4 in lung cancer tissues were significantly lower than in normal tissues (P〈0.05). All these four proteins were associated with TNM staging. There was a strongly negative correlation between p38 and Smad4. Expressions of Smad4, p38 and JNK1, as well as tumor differentiation and staging were significantly correlated with the prognosis of NSCLC by univariate analysis. By multivariate analysis, only Smad4, p38, tumor differentiation and staging were correlated with the prognosis. Taken together, the negative expression of p38 and positive expression of Smad4 were associated with a better prognosis of NSCLC. Conclusion: Smad4 could be of vital importance for the initiation and development of NSCLC. The expression of Smad4 might be inhibited by p38, supporting a cross-talk between main proteins of TGF-beta/Smad and ras-MAPK signal transduction pathways. Smad4 and p38 could be possible prognostic factors for NSCLC.展开更多
Objective: To study the effects of tetrandrine (Tet) on phenotypic modulation of vascular smooth muscle cells (VSMCs) and expression of p38 mitogen-activated protein kinase (p38MAPK) as well as mitogen-activate...Objective: To study the effects of tetrandrine (Tet) on phenotypic modulation of vascular smooth muscle cells (VSMCs) and expression of p38 mitogen-activated protein kinase (p38MAPK) as well as mitogen-activated protein kinase phosphatase-1 (MKP-1) after vascular intimal injury. Methods: HE staining was used to analyze vascular morphology of sham-injured group, injured group and Tet-treated group at day 28. lmmunohistochemistry, Western blot and RT-PCR were respectively used to detect the expression change of smooth muscle a-actin (SMa-actin), proliferation cell nuclear antigen (PCNA), p38MAPK and MKP-1 of injured group and Tet group at days 7, 14 and 28 after balloon injury. Results: ① All layers of vascular wall in sham-injured group were intact at day 28. The neointimal area was significantly increased and the lumen area notably decreased in injured group at day 28. The neointimal proliferation in Tet treated group was less than that in injured group, and the lumen area of Tet group was significantly increased than that of injured group at day 28. ②Compared with the injured group, the expression of SMa-actin, PCNA, p38MAPK and MKP-1 of vascular wall in Tet group was no difference, and the neointimal proliferation condition was also basically as same as injured group at day 7 after injury. The expression of PCNA and p38MAKP in Tet group was obviously lower than that in injured group, and the expression of MKP-1 in Tet group was obviously higher than that in injured group at days 14 and 28 after injury. The expression of SMa-actin in Tet group was slightly higher than that in injured group at days 14 and 28 after injury. Conclusions: Tet could reduce neointimal proliferation by inhibiting VSMCs phenotypic modulation and p38MAPK signaling transduction pathway as well as its down regulation.展开更多
Bone morphogenetic proteins (BMPs) induce ectopic bone formation and promote osteoblast differentiation. It has been documented that Smad transcriptional factors function as primary mediators of BMPs activity. Recep...Bone morphogenetic proteins (BMPs) induce ectopic bone formation and promote osteoblast differentiation. It has been documented that Smad transcriptional factors function as primary mediators of BMPs activity. Receptor-regulated Smad (Smad1, 5, 8) could be phosphorylated by activated BMPR-I and form complex with Smad4. The Smad complex translocates to the nucleus and regulate target gene transcription. Recently, several reports suggested that Mitogen-Activated Protein Kinase (MAPK) signaling pathways could be initiated downstream of the BMP receptor complex. Alkaline phosphatase (ALP) is an early marker of osteoblast differentiation Both ALP activity and its mRNA expression level could be increased by BMP4 treatment. Previously, we demonstrated that mutation of ERK1/2 phosphorylation sites in Smad5 partially rescued Smad transcriptional activity. However, fibroblast growth factor2-suppressed ALP activity could not be rescued similarly by introduction of Smad5 mutant in MC3T3-E1. These results prompted us to further evaluate the effect of BMP4-stimulated Smad transcriptional activity on ALP expression in this study.展开更多
Acute lung injury (ALI) is a leading complication in extensively burnedpatients, especially those with inhalation injury. It can cause hypoxia resulting in injury ofremote organs and dysfunction. p38 mitogen-activated...Acute lung injury (ALI) is a leading complication in extensively burnedpatients, especially those with inhalation injury. It can cause hypoxia resulting in injury ofremote organs and dysfunction. p38 mitogen-activated protein kinase (p38 MARK) is a stress activatedprotein kinase in the MARK family. Most of the previous studies have demonstrated that p38 MARKsignal transduction pathway mediated All in rats with acute severe pancreatitis, sepsis etc.However, there is little information regarding the role of p38 MARK signal transduction pathway inALI after severe burn trauma.展开更多
Background The microemboli produced during spontaneous plaque rupture and ulceration and during coronary intervention will reduce coronary reserve and cause cardiac dysfunction. It is though that inflammation caused b...Background The microemboli produced during spontaneous plaque rupture and ulceration and during coronary intervention will reduce coronary reserve and cause cardiac dysfunction. It is though that inflammation caused by the microinfarction induced by the microembolization may play an essential role. It is known that the activation of p38 mitogen-activated protein kinases (MAPK) in both infected and non-infected inflammation in myocardium may cause a contractile dysfunction. But the relation between the activation of p38 MAPK and microembolization is still unknown. Methods Sprague-Dawley rats were randomly divided into three groups: Sham group, coronary microembolization (CME) group and SB203580 group (n=-10 per group). CME rats were produced by injection of 42 pm microspheres into the left ventricle with occlusion of the ascending aorta. SB203580, a p38 MAPK inhibitor, was injected into the femoral vein after the injection of microspheres to make the SB203580 group. Left ventricular ejection fraction (LVEF) was determined by echocardiography. The protein concentration of P38 MAPK in the myocardium was assessed by Western blotting. The relative expression of mRNA for tumor necrosis factor (TNF)-a was assessed by the technique of semi-quantitative polymerase chain reaction amplification. Results LVEF was depressed at three hours up to 12 hours in the CME group. Increased p38 MAPK activity and TNF-a mRNA expression were observed in the CME group. The administration of SB203580 partly inhibited p38 MAPK activity, but did not fully depress the TNF-α expression, and partly preserved cardiac contractile function. Conclusions p38 MAPK is significantly activated by CME and the inhibition of p38 MAPK can partly depress the TNF-a expression and preserve cardiac contractile function.展开更多
Background:Sepsis,a serious condition with high mortality,usually causes sepsis associated encephalopathy(SAE)that involves neuronal cell death.However,the cell death programs involved and their underlying mechanisms ...Background:Sepsis,a serious condition with high mortality,usually causes sepsis associated encephalopathy(SAE)that involves neuronal cell death.However,the cell death programs involved and their underlying mechanisms are not clear.This study aimed to explore the regulatory mechanisms of different cell death programs in SAE.Methods:A neonatal rat model of SAE was established by cecal ligation and perforation.Survival rate and vital signs(mean arterial pressure and heart rate)were monitored,nerve reflexes were evaluated,and cortical pathological changes were observed by hematoxylin and eosin staining.The expression of pyroptosis,apoptosis,and necroptosis(PANoptosis)-related proteins,mitogen-activated protein kinase(MAPK),and its upstream regulator toll-like receptor 9(TLR9)were detected.The expression of TLR9 in neurons was observed by immunofluorescence staining.The ultrastructure of neurons was observed by transmission electron microscope.Results:First,PANoptosis was found in cortical nerve cells of the SAE rats.Meanwhile,the subunits of MAPKs,p38 MAPK,Jun N-terminal kinase,and extracellular signal-regulated kinase(ERK)were activated.After pharmacologically inhibiting each of the subunits,only p38 MAPK was found to be associated with PANoptosis.Furthermore,blocking the p38 MAPK signaling pathway activated necroptosis but inhibited apoptosis and pyroptosis.When necroptosis was pharmacologically inhibited,apoptosis and pyroptosis were reactivated.Finally,we found that the expression of TLR9,a regulator of MAPKs,was significantly increased in this model.After down-regulation of TLR9,p38 MAPK,and ERK signaling pathways were inhibited,which led to the inhibition of PANoptosis.Further analysis found that down-regulation of TLR9 improved the survival rate and reduced the pathological changes in SAE rats.Conclusions:Our study showed that the programs comprising PANoptosis are activated simultaneously in SAE rats.TLR9 activated PANoptosis through the p38 MAPK signaling pathway.TLR9 may work as a potential target for SAE treatment.展开更多
Background Astrocyte swelling is an important consequence of hepatic encephalopathy, and aquaporin-4 has been reported to play a vital role in this swelling. Ammonia causes astrocyte swelling and is also known to modu...Background Astrocyte swelling is an important consequence of hepatic encephalopathy, and aquaporin-4 has been reported to play a vital role in this swelling. Ammonia causes astrocyte swelling and is also known to modulate aquaporin-4 expression in the astrocyte foot processes. The purpose of this study was to explore the mechanism of ammonia-induced aquaporin-4 expression, which has been suggested to involve the p38 mitogen-activated protein kinase pathway. Methods We exposed cultured astrocytes to ammonium chloride, an in vitro model of hepatic encephalopathy. The purity of cultured astrocytes was evaluated by fluorescent glial fibrillary acidic protein labeling; cell morphology was assessed by light microscopy; the expression of aquaporin-4, phospho-p38, and p38 were detected by Western blotting analysis. Statistical analysis was performed by one-way factorial analysis of variance, and the relationship between variables was calculated by linear regression using SPSS version 13.0 program for Windows (SPSS, Chicago, IL, USA). Results The purity of cultured astrocytes was (96.6±1.4)%. Astrocytes swelled significantly when exposed to 5 mmol/L ammonium chloride for 24 hours as compared to non-exposed astrocytes. Co-treatment with 10 μmol/L SB203580 (an inhibitor of p38) attenuated the degree of ammonium chloride induced astrocyte swelling. Western blotting analysis revealed that the expression levels of phospho-p38 and aquaporin-4 in ammonium chloride treated cells were significantly increased relative to the control group (P 〈0.001); SB203580 co-treatment inhibited the increased expression of phospho-p38 and aquaporin-4 relative to the ammonium chloride treated group (P=0.002 and P=0.015 respectively). The phosphorylation of p38 and upregulation of aquaporin-4 were highly correlated (r=0.909). There were no significant differences in total p38 expression among the groups (P=0.341). Conclusions Ammonium chloride induced upregulation of aquaporin-4 in astrocytes is regulated by the p38 mitogen-activated protein kinase pathway. Inhibiting p38 activation prevented ammonium chloride induced aquaporin-4 protein upregulation.展开更多
Objective: To investigate whether analgesic effect of electroacupuncture(EA) is affected by p38 mitogen-activated protein kinase(p38 MAPK) on microglia. Methods: There were two experiments. The experiment 1: 40...Objective: To investigate whether analgesic effect of electroacupuncture(EA) is affected by p38 mitogen-activated protein kinase(p38 MAPK) on microglia. Methods: There were two experiments. The experiment 1: 40 male Sprague-Dawley(SD) rats were randomly divided into the normal, surgery, EA and sham EA groups, and the L5 spinal nerve ligation(SNL) on the right side was used to establish neuropathic pain model. EA was applied to bilateral Zusanli(ST36) and Kunlun(BL60) at 24, 48 and 72 h after SNL for 30 min, once per day. The paw withdrawal thresholds(PWTs) were measured before surgery(as base) and at 24, 25, 49 and 73 h after surgery. Phospho-p38 MAPK(p-p38 MAPK), oxycocin-42(OX-42, marker of microglia), and glial fibrillary acidic protein(GFAP, marker of astrocyte) in bilateral spinal cord dorsal horn(SCDH) were detected by immunofluorescence, respectively. The experiment 2: 40 male SD rats were cannulated for SNL-induced neuropathic pain, and then were randomly divided into the dimethyl sulfoxide(DMSO), EA plus DMSO, 4-(4-fluorophenyl)-2-(4-methylsulfonylpheny)-5-(4-pyridyl)-1H-imidazole(SB203580) and EA plus SB203580 groups. SB203580(30 nmol/L) was administered 5 min prior to EA treatment. The PWTs and OX-42 in bilateral SCDH were measured as mentioned above. Results: SNL-induced neuropathic pain reduced PWTs and increased the expression of p-p38 MAPK and OX-42 in bilateral lumbar SCDH of rats(P〈0.01). Spinal p-p38 MAPK was only co-localized with OX-42 in our study. EA treatment significantly alleviated SNL-mediated mechanical hyperalgesia, and suppressed the expression of p-p38 MAPK and OX-42 in lumbar SCDH(P〈0.05 or P〈0.01). Intrathecal injection of low dose SB203580 had no influence on PWTs(P〉0.05), but significantly inhibited the expression of OX-42 positive cells in bilateral SCDH(P〈0.01 or P〈0.05). EA plus SB203580 synergistically increased PWTs, and reduced the expression of bilateral spinal OX-42(P〈0.01 or P〈0.05). Conclusions: The central mechanism of EA-induced anti-hyperalgesia may be partially associated with the reduced expression of p-p38 MAPK, and subsequently reducing the activation of OX-42 in neuropathic pain. Therefore, EA may be a new complementary and alternative therapy for neuropathic pain.展开更多
OBJECTIVE:To investigate the efficacy of needling acupoins of Guanyuan(CV4),Sanyinjiao(SP6),Zusanli(ST36),Pishu(BL20),Shenshu(BL23),Zigong(EX-CA1)on the expression of p38 mitogen-activated protein kinase(p38MAPK)in ov...OBJECTIVE:To investigate the efficacy of needling acupoins of Guanyuan(CV4),Sanyinjiao(SP6),Zusanli(ST36),Pishu(BL20),Shenshu(BL23),Zigong(EX-CA1)on the expression of p38 mitogen-activated protein kinase(p38MAPK)in ovarian tissue in rats with premature ovarian failure induced by cyclophosphamide,and to study the underlying mechanism.METHODS:Forty specific pathogen free female Sprague-Dawley rats were randomly divided into the blank group,the model group,the acupuncture group,the Western Medicine group and the Western Medicine combined with acupuncture group.Except the blank group,the rest of the rats were given with cyclophosphamide for 14 d to establish premature ovarian failure model.No intervention was conducted in the blank group and model group;the acupuncture group was given with acupuncture daily;the Western Medicine group was given with estradiol valerate(0.09 mg/kg)by intragastrical gavage daily;the combination group was given with acupuncture combined with estradiol valerate(0.09 mg/kg)daily.Each group was intervened in continuously for 14 d.After the last treatment,the levels of estradiol(E2),follicle stimulating hormone(FSH)and luteinizing hormone(LH)were detected by enzyme-linked immunosorbent assay,then the ovarian tissue was dissected.Western blot was used to detect the expression of p38 MAPK protein.RESULTS:Compared with the blank group,E2 in the serum of rats in the model group was significantly decreased(P<0.05),FSH and LH were significantly increased(P<0.05),and the expression of p38 MAPK protein in the ovarian tissue of the rats was significantly increased(P<0.05).Compared with the model group,E2 in the serum of the acupuncture group,Western Medicine group and the combination group were significantly increased(P<0.05),FSH and LH levels were significantly decreased(P<0.05),and the expression of p38MAPK protein in the ovarian tissue of the rats was significantly decreased(P<0.05).However,there was no statistically significant difference between the Western Medicine group and the acupuncture group(P>0.05).CONCLUSIONS:Acupuncture has the same effect as estrogen in interfering POF caused by cyclophosphamide,and its mechanism may be related to inhibiting the expression of p38MAPK protein in ovarian tissue and affecting the activation of p38MAPK signaling pathway.展开更多
Objective: To investigate the underlying mechanisms of cyclovirobuxinum D(Cvb-D) on alleviating cardiac hypertrophy in rats. Methods: Sprague-Dawley rats were randomly divided into 5 groups: control group; levoth...Objective: To investigate the underlying mechanisms of cyclovirobuxinum D(Cvb-D) on alleviating cardiac hypertrophy in rats. Methods: Sprague-Dawley rats were randomly divided into 5 groups: control group; levothyroxine-induced cardiac hypertrophy group(model); levothyroxine-induced cardiac hypertrophy + Cvb-D group(Cvb-D); levothyroxine-induced cardiac hypertrophy + captopril group(captopril); levothyroxine-induced cardiac hypertrophy + SB203580 group(SB203580), n=10 for each group. Rats were daily administered the respective drugs continuously for14 days by gastric gavage. A rat model of cardiac hypertrophy was established by intraperitoneal injection of levothyroxine to investigate whether Cvb-D protects against cardiac hypertrophy by inhibiting the p38 mitogen-activated protein kinase(MAPK) signaling pathway and preventing apoptosis of cardiac cells. Results: Treatment with Cvb-D significantly deceased left ventricle hypertrophy, improved the histopathology, hemodynamic conditions, and cardiac function in rats with cardiac hypertrophy. Compared with the normal control group, in rats with cardiac hypertrophy, expression of bax in the heart and phospho-p38 MAPK protein levels were significantly up-regulated(P〈0.01 or 0.05), whereas the bcl-2 protein level was downregulated(P〈0.01). In contrast, Cvb-D treatment reversed the changes in bax and phospho-p38 MAPK protein levels but increased the bcl-2 protein level(P〈0.01 or 0.05), and these effects were similar to those of captopril and SB203580(a specific p38 MAPK inhibitor) treatment. Furthermore, both Cvb-D, captopril and SB203580 reduced m RNA expression of p38α, p38β, c-fos, and c-jun m RNA, and Cvb-D had a stronger effect(P〈0.01). Conclusion: These results demonstrate that Cvb-D protects against cardiac hypertrophy, which is possibly mediated by prevention of cardiac cell apoptosis and inhibition of the p38 MAPK signaling pathway.展开更多
OBJECTIVE: To investigate the efficacy of Xiaokeping(XKP)-containing serum on the proliferation of high-glucose-induced mesangial cells(MCs)and the potential underlying mechanism.METHODS: XKP-containing serum was prep...OBJECTIVE: To investigate the efficacy of Xiaokeping(XKP)-containing serum on the proliferation of high-glucose-induced mesangial cells(MCs)and the potential underlying mechanism.METHODS: XKP-containing serum was prepared by the intragastric administration of XKP in rats.HBZY-1 cells were cultured with normal glucose(NC group), high glucose(HG group), and high glucose with different XKP concentrations. Cell proliferation was assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay,and the cell cycle distribution was detected by flow cytometry. The expression of p38 mitogen-activated protein kinase(p38 MAPK) pathway components in MCs was detected by Western blotting and quantitative real-time polymerase chain reaction.RESULTS: The MC proliferation level in the high-glucose group was significantly higher than that in the normal control group, and XKP suppressed the HG-induced proliferation of MCs dose dependently. Moreover, flow cytometry revealed that XKP blocked cell cycle progression by inducing cell cycle arrest in G1 phase and inhibiting S phase entry. XKP down-regulated the protein and m RNA expression of p38 MAPK in MCs(P < 0.05 vs HG).CONCLUSION: The present study demonstrated that XKP-containing serum inhibits high-glucoseinduced proliferation of MCs by causing cell cycle arrest at G1 phase and inhibiting S phase entry. The underlying mechanism involves the down-regulation of the p38 MAPK signaling pathway, providing a theoretical basis for the use of XKP to treat diabetic kidney disease.展开更多
The aim of this study was to investigate the role of p38 mitogen-activated protein kinase(MAPK)in cell migration induced by platelet-derived growth factor(PDGF).Western blot was performed to detect the phosphorylation...The aim of this study was to investigate the role of p38 mitogen-activated protein kinase(MAPK)in cell migration induced by platelet-derived growth factor(PDGF).Western blot was performed to detect the phosphorylation of p38 in NIH3T3 cells treated with PDGF.A Transwell cell migration system was used to determine the effects of PDGF treatment on the migration of NIH3T3 cells and the influence of p38 deficiency on this process in a p38 gene knockout(p38^(−/−))mouse embryonic fibroblast cell line.On the stimulation of PDGF,the migration of NIH3T3 cells was significantly increased(P<0.001)compared to the control and p38 MAP kinase was simultaneously phosphorylated.Furthermore,the PDGF-induced cell migration was significantly blocked in p38 gene knockout(p38^(−/−))mouse embryonic fibroblasts(MEFs)(P<0.001)as compared with the wild type cells(p38+/+).p38 MAPK plays an important role in the regulation of cell migration induced by PDGF.展开更多
基金supported by the National Natural Science Foundation of China,No.81173355
文摘Electroacupuncture attenuates cerebral hypoxia and neuronal apoptosis induced by cerebral ischemia/reperfusion injury.To further identify the involved mechanisms,we assumed that electroacupuncture used to treat cerebral ischemia/reperfusion injury was associated with the p38 mitogen-activated protein kinase(MAPK) signaling pathway.We established rat models of cerebral ischemia/reperfusion injury using the modified Zea-Longa's method.At 30 minutes before model establishment,p38 MAPK blocker SB20358 was injected into the left lateral ventricles.At 1.5 hours after model establishment,electroacupuncture was administered at acupoints of Chize(LU5),Hegu(LI4),Zusanli(ST36),and Sanyinjiao(SP6) for 20 minutes in the affected side.Results showed that the combination of EA and SB20358 injection significantly decreased neurologic impairment scores,but no significant differences were determined among different interventional groups.Hematoxylin-eosin staining also showed reduced brain tissue injuries.Compared with the SB20358 group,the cells were regularly arranged,the structures were complete,and the number of viable neurons was higher in the SB20358 + electroacupuncture group.Terminal deoxynucleotidyl transferase(Td T)-mediated d UTP nick-end labeling assay showed a decreased apoptotic index in each group,with a significant decrease in the SB20358 + electroacupuncture group.Immunohistochemistry revealed reduced phosphorylated p38 expression at 3 days in the electroacupuncture group and SB20358 + electroacupuncture group compared with the ischemia/reperfusion group.There was no significant difference in phosphorylated p38 expression between the ischemia/reperfusion group and SB20358 group.These findings confirmed that the electroacupuncture effects on mitigating cerebral ischemia/reperfusion injury are possibly associated with the p38 MAPK signaling pathway.A time period of 3 days could promote the repair of ischemic cerebral nerves.
文摘Mitogen-activated protein kinases(MAPKs)are a family of proteins that constitute signaling pathways involved in processes that control gene expression,cell division, cell survival,apoptosis,metabolism,differentiation and motility.The MAPK pathways can be divided into conventional and atypical MAPK pathways.The first group converts a signal into a cellular response through a relay of three consecutive phosphorylation events exerted by MAPK kinase kinases,MAPK kinase,and MAPK.Atypical MAPK pathways are not organized into this three-tiered cascade.MAPK that belongs to both conventional and atypical MAPK pathways can phosphorylate both non-protein kinase substrates and other protein kinases.The latter are referred to as MAPK-activated protein kinases.This review focuses on one such MAPK-activated protein kinase,MAPK-activated protein kinase 5(MK5)or p38-regulated/activated protein kinase(PRAK).This protein is highly conserved throughout the animal kingdom and seems to be the target of both conventional and atypical MAPK pathways.Recent findings on the regulation of the activity and subcellular localization,bona fide interaction partners and physiological roles of MK5/PRAK are discussed.
基金the General Program of National Natural Science Foundation of China, No.90709034
文摘Recent studies have shown that varied stress stimuli activate c-Jun N-terminal kinase (JNK), protein kinase B (Akt), and p38 mitogen-activated protein kinase (p38) signal transduction pathway, and also regulate various apoptotic cascades. JNK and p38 promote apoptosis, but Akt protects against apoptosis, in hippocampal neurons. However, changes in the transduction pathway in different regions of brain tissues in a chronic stress rat model of depression remain poorly understood. Results from this study showed that JNK phosphorylation levels were significantly greater in the stress group hippocampus compared with the control group (P 〈 0.05). No significant difference in JNK phosphorylation levels was detected in the rat cerebral cortex between stress and control groups, and no significant difference in Akt and p38 phosphorylation levels was detected in the rat hippocampus and cerebral cortex between stress and control groups (P 〉 0.05). These results suggested that the JNK signal pathway is activated by JNK phosphorylation and participates in pathophysiological changes in rat models of depression.
基金supported by the National Natural Science Foundation of China, No. 81171191Shenzhen Bureau of Science Technology and Information, No. 201002013+1 种基金Guangdong Province Medical Science Fund, No. A2008601 and Jinan University Scientific Research Foundation for Creation and Cultivation, No. 21609708
文摘Cerebral ischemia was induced using photothrombosis 1 hour after intraperitoneal injection of the p38 mitogen-activated protein kinase (MAPK) inhibitor $B239063 into Swedish mutant amyloid precursor protein (APP/SWE) transgenic and non-transgenic mice. The number of surviving neurons in the penumbra was quantified using Nissl staining, and the activity of p38 MAPKs was measured by western blotting. The number of surviving neurons in the penumbra was significantly reduced in APP/SWE transgenic mice compared with non-transgenic controls 7 days after cerebral ischemia, but the activity of p38 MAPKs was significantly elevated compared with the non-ischemic hemisphere in the APP/SWE transgenic mice. SB239063 prevented these changes. The APP/SWE mutation exacerbated ischemic brain injury, and this could be alleviated by inhibiting p38 MAPK activity.
基金supported by the National Natural Science Foundation of China,No.81373759the Natural Science Foundation of Beijing of China,No.7142097
文摘Tuina is a traditional Chinese treatment for sensory disturbances caused by peripheral nerve injury and related diseases. Our previous studies showed that tuina regulates relevant regions and indices of the spinal dorsal horn using the Dian, Bo, and Rou method in Yinmen(BL37), Yanglingquan(GB34), and Weizhong(BL40). Treatment prevents muscle atrophy, protects spinal cord neurons, and promotes sciatic nerve repair. The mechanisms of action of tuina for treating peripheral nerve injury remain poorly understood. This study established rat models of sciatic nerve injury using the crushing method. Rats received Chinese tuina in accordance with the principle of "Three Methods and Three Points," once daily for 20 days. Tuina intervention reduced paw withdrawal latency and improved wet weight of the gastrocnemius muscle, as well as promoting morphological recovery of sciatic nerve fibers, Schwann cells, and axons. The protein expression levels of phospho-p38 mitogen-activated protein kinase, tumor necrosis factor-α, and interleukin-1β also decreased. These findings indicate that "Three Methods and Three Points" promoted morphological recovery and improved behavior of rats with peripheral nerve injury.
基金a Grant from Hubei Provincial Health Ministry,No.JX3C58
文摘BACKGROUND: Activated N-methyl-D-aspartate (NMDA) receptor is involved in the formation of chronic neuropathic pain, and its antagonist, ketamine, exhibits effective amelioration of diabetic neuropathic pain (DNP). However, the mechanisms of NMDA receptor participation in the formation and maintenance of DNP remain poorly understood. OBJECTIVE: To evaluate the role NMDA receptor plays in DNP and effects on p38 mitogen activated protein kinase (p38 MAPK) in a rat model of DNP. DESIGN, TIME AND SETTING: A randomized, controlled, animal experiment was performed at the Human Embryonic Stem Cell Research Institute of Yunyang Medical College Affiliated Taihe Hospital between July 2005 and September 2007. MATERIALS: Streptozotocin was provided by Sigma, USA; p38 MAPK inhibitor (SB203580) was provided by Shanghai KangChen Biotech, China; NMDA receptor antagonist (MK-801) was purchased from Shanghai Yope Biotech, China. METHODS: A total of 128 healthy, Wistar rats of clean grade, aged 3 months and weighing 180- 220 g, were randomly assigned to 4 groups: control, DNP model, p38 MAPK, and NMDA receptor. Each group contained 32 rats. DNP was established in all groups except for the control group by intraperitoneal injection of streptozocin (65 mg/kg). Subsequently, 1 mg/kg SB203580 and 1 mg/kg MK-801 were injected once each week via intraperitoneal injection in the p38 MAPK and NMDA receptor groups, respectively. MAIN OUTCOME MEASURES: At the end of 2, 4, 6, and 8 weeks following streptozotocin injection, mechanical withdrawal threshold was measured in 8 animals from each group following von Frey filament stimulation. The rats were anesthetized and nerve conduction velocity of the left sciatic nerve was measured. Subsequently, the right sciatic nerve, the lumbar segment of the spinal cord, and dorsal root ganglia were removed from the L3-6 segment for microscopic examination, p38 MAPK expression was determined using immunohistochemistry and Western blot analysis. Expression of NMDA receptor 1 mRNA in dorsal root ganglion and spinal cord neurons was detected using RT-PCR. RESULTS: Mechanical withdrawal threshold and nerve conduction velocity were significantly reduced, and p38 MAPK and NMDA receptor 1 mRNA expression in the spinal cord and dorsal root ganglia were significantly increased, in the model, p38 MAPK, and NMDA receptor groups compared with the control group at all time points (P 〈 0.05). At 4-8 weeks following successful DNP model establishment, SB203580 and MK-801 increased mechanical withdrawal threshold, accelerated nerve conduction velocity, and attenuated p38 MAPK expression, compared with the model group. The NMDA receptor group exhibited downregulated mRNA expression of NMDA receptor 1 compared with the model and p38 MAPK groups (P 〈 0.05). CONCLUSION: NMDA receptor was highly expressed in the brains of DNP rats and was involved in DNP development via activation of the p38 MAPK signal pathway.
文摘Background Recent studies have suggested that p38 mitogen-activated protein kinases (MAPK) signalling pathway plays an important role in hepatic fibrosis. This study explored the antifibrotic effect of oxymatrine on tetrachloromethane induced liver fibrosis in rats and its modulation on the p38 MAPK signalling pathway. Methods One hundred and twenty healthy male Sprague-Dawley rats were randomly assigned to six groups: normal (n=20), induced fibrosis (n=20), colchicine (n=20) and three treatment groups of oxymatrine (n=20x3). We obesrved changes in deposition of collagen, hyaluronic acid (HA), laminin (LN), collagen type IV (CIV), procollagen III (PCIll) and hydroxyproline (Hyp), a-smooth muscle actin (α-SMA) and phosphor-p38 (pp38). Results The relative indicators of changes in histopathology, HA, LN, CIV, PCIII, Hyp, a-SMA and pp38 were raised significantly in the induced fibrosis group (P〈0.01 vs normal group). The semiquantitative hepatic fibrosis staging scores of middle dose group and high dose group were decreased (P 〈0.05 and P 〈0.01 respectively vs the induced fibrosis group), as was the average area of collagen in rats' liver, the concentrations of serum HA, LN, CIV, PCIII and liver tissue homogenate Hyp. The gene expression of α-SMA mRNA was considerably decreased in the treated animals, as was the protein espression of pp38 protein. Conclusions Oxymatrine is effective in reducing the production and deposition of collagen in the liver tissue of experimental rats in ways which relate to modulating the fibrogenic signal transduction via p38 MAPK signalling pathway.
基金This study was supported by a grant from the National Natural Sicence Foundation of China(No.30672032).
文摘Background p38 mitogen-activated protein kinases (MAPK) in ischemic preconditioning (IPC) may be essential to cardioprotection. We assessed whether protective effect of morphine-induced preconditioning (MPC) on myocardial ischemia and reperfusion injury in rat hearts involved p38 MAPK activation.Methods Male Spargue-Dawley rats (weighing 300--350 g) were randomly assigned to 1 of the following 8 groups: control (CON, saline vehicle, n=9), SB 203580 (SB, a p38 MAPK inhibitor, n=6), MPC (n=6), IPC (n=9), SB+MPC, SB+IPC, MPC+SB, and IPC+SB (n=6). Infarct sizes (IS), a percentage of the area at risk (AAR), were determined by triphenyltetrazolium (TTC) staining. Hssue samples were processed from the entire AAR of left ventricle for the determination of p38 MAPK protein expression (5 hearts/group). The bands representing the proteins were visualized using an enhanced chemiluminescence detection system. Results The IS/AAR was significantly reduced by I PC (12.9±1.6)% or MPC (25.3±2.9)% compared to the control (52.7±5.5)%. SB 203580 administered prior to preconditioning abolished the effect of IPC (SB+IPC: (43.8±2.6)%, P〉0.05 vs CON, P〈0.01 vs IPC), but not MPC (SB+MPC: (30.7±0.9)%, P〈0.01 vs CON, P〉0.05 vs MPC). Treatment with SB 203580 prior to sustained ischemia diminished the protective effect of both MPC (MPC+SB: (42.4±2.9)%, P〉0.05 vs CON) and IPC (IPC+SB: (52.0±2.5)%, P〉0.05 vs CON) on IS/AAR. In the IPC group, phospho-p38 MAPK protein increased significantly within 5 minutes into ischemia and remained elevated at 30 minutes into reperfusion, while phospho-p38 MAPK protein in the MPC group only increased significantly at 30 minutes into reperfusion.Conclusion The activation of p38 MAPK just acts as a mediator of MPC,whereas it acts as both a trigger and a mediator in IPC.
基金This work was supported by the National Natural Science Foundation of China(No.30100220)
文摘Objective: Impaired signal transduction is associated with tumorigenesis and progression of various kinds of human cancers. Transforming growth factor (TGF)-beta/Smad and ras-mitogen activated protein kinase (MAPK) are two major signal transduction pathways for adjusting cell proliferation and differentiation. Little is known about TGF-beta/Smad4 in non-small cell lung cancer (NSCLC). Hereby, we investigated the expression of Smad4 in NSCLC, its correlation with MAPK proteins (including p38, ERK1 and JNK1 proteins) and their clinical significance in NSCLC. Methods: The expressions of Smad4, p38, ERK1 and JNK1 were detected at protein level with Western blotting and immunohistochemistry, at transcription level with RT-PCR. Statistical analysis was performed for the comparisons of expressions of Smad4, p38, ERK1 and JNK1, and their correlation with various clinicopathological parameters and the prognosis of NSCLC. Results: The levels of protein and mRNA expression of Smad4 in lung cancer tissues were significantly lower than in normal tissues (P〈0.05). All these four proteins were associated with TNM staging. There was a strongly negative correlation between p38 and Smad4. Expressions of Smad4, p38 and JNK1, as well as tumor differentiation and staging were significantly correlated with the prognosis of NSCLC by univariate analysis. By multivariate analysis, only Smad4, p38, tumor differentiation and staging were correlated with the prognosis. Taken together, the negative expression of p38 and positive expression of Smad4 were associated with a better prognosis of NSCLC. Conclusion: Smad4 could be of vital importance for the initiation and development of NSCLC. The expression of Smad4 might be inhibited by p38, supporting a cross-talk between main proteins of TGF-beta/Smad and ras-MAPK signal transduction pathways. Smad4 and p38 could be possible prognostic factors for NSCLC.
文摘Objective: To study the effects of tetrandrine (Tet) on phenotypic modulation of vascular smooth muscle cells (VSMCs) and expression of p38 mitogen-activated protein kinase (p38MAPK) as well as mitogen-activated protein kinase phosphatase-1 (MKP-1) after vascular intimal injury. Methods: HE staining was used to analyze vascular morphology of sham-injured group, injured group and Tet-treated group at day 28. lmmunohistochemistry, Western blot and RT-PCR were respectively used to detect the expression change of smooth muscle a-actin (SMa-actin), proliferation cell nuclear antigen (PCNA), p38MAPK and MKP-1 of injured group and Tet group at days 7, 14 and 28 after balloon injury. Results: ① All layers of vascular wall in sham-injured group were intact at day 28. The neointimal area was significantly increased and the lumen area notably decreased in injured group at day 28. The neointimal proliferation in Tet treated group was less than that in injured group, and the lumen area of Tet group was significantly increased than that of injured group at day 28. ②Compared with the injured group, the expression of SMa-actin, PCNA, p38MAPK and MKP-1 of vascular wall in Tet group was no difference, and the neointimal proliferation condition was also basically as same as injured group at day 7 after injury. The expression of PCNA and p38MAKP in Tet group was obviously lower than that in injured group, and the expression of MKP-1 in Tet group was obviously higher than that in injured group at days 14 and 28 after injury. The expression of SMa-actin in Tet group was slightly higher than that in injured group at days 14 and 28 after injury. Conclusions: Tet could reduce neointimal proliferation by inhibiting VSMCs phenotypic modulation and p38MAPK signaling transduction pathway as well as its down regulation.
基金This work was supported by a grant from the National 863 Program (No. 2003AA205170).
文摘Bone morphogenetic proteins (BMPs) induce ectopic bone formation and promote osteoblast differentiation. It has been documented that Smad transcriptional factors function as primary mediators of BMPs activity. Receptor-regulated Smad (Smad1, 5, 8) could be phosphorylated by activated BMPR-I and form complex with Smad4. The Smad complex translocates to the nucleus and regulate target gene transcription. Recently, several reports suggested that Mitogen-Activated Protein Kinase (MAPK) signaling pathways could be initiated downstream of the BMP receptor complex. Alkaline phosphatase (ALP) is an early marker of osteoblast differentiation Both ALP activity and its mRNA expression level could be increased by BMP4 treatment. Previously, we demonstrated that mutation of ERK1/2 phosphorylation sites in Smad5 partially rescued Smad transcriptional activity. However, fibroblast growth factor2-suppressed ALP activity could not be rescued similarly by introduction of Smad5 mutant in MC3T3-E1. These results prompted us to further evaluate the effect of BMP4-stimulated Smad transcriptional activity on ALP expression in this study.
文摘Acute lung injury (ALI) is a leading complication in extensively burnedpatients, especially those with inhalation injury. It can cause hypoxia resulting in injury ofremote organs and dysfunction. p38 mitogen-activated protein kinase (p38 MARK) is a stress activatedprotein kinase in the MARK family. Most of the previous studies have demonstrated that p38 MARKsignal transduction pathway mediated All in rats with acute severe pancreatitis, sepsis etc.However, there is little information regarding the role of p38 MARK signal transduction pathway inALI after severe burn trauma.
文摘Background The microemboli produced during spontaneous plaque rupture and ulceration and during coronary intervention will reduce coronary reserve and cause cardiac dysfunction. It is though that inflammation caused by the microinfarction induced by the microembolization may play an essential role. It is known that the activation of p38 mitogen-activated protein kinases (MAPK) in both infected and non-infected inflammation in myocardium may cause a contractile dysfunction. But the relation between the activation of p38 MAPK and microembolization is still unknown. Methods Sprague-Dawley rats were randomly divided into three groups: Sham group, coronary microembolization (CME) group and SB203580 group (n=-10 per group). CME rats were produced by injection of 42 pm microspheres into the left ventricle with occlusion of the ascending aorta. SB203580, a p38 MAPK inhibitor, was injected into the femoral vein after the injection of microspheres to make the SB203580 group. Left ventricular ejection fraction (LVEF) was determined by echocardiography. The protein concentration of P38 MAPK in the myocardium was assessed by Western blotting. The relative expression of mRNA for tumor necrosis factor (TNF)-a was assessed by the technique of semi-quantitative polymerase chain reaction amplification. Results LVEF was depressed at three hours up to 12 hours in the CME group. Increased p38 MAPK activity and TNF-a mRNA expression were observed in the CME group. The administration of SB203580 partly inhibited p38 MAPK activity, but did not fully depress the TNF-α expression, and partly preserved cardiac contractile function. Conclusions p38 MAPK is significantly activated by CME and the inhibition of p38 MAPK can partly depress the TNF-a expression and preserve cardiac contractile function.
基金This work was supported by grants from the National Natural Science Foundation of China(Nos.81630038,81771634,81842011,81801629,81971433,81971428,and 82071353)the National Key Research and Development Program(Nos.2017YFA0104200 and 2017YFA0104201)+2 种基金the grants from the Science and Technology Bureau of Sichuan Province(Nos.2021YJ0017 and 2020YFS0041)the Fundamental Research Funds for the Central University(No.SCU2020D006)the National Key Project of Neonatal Children(No.1311200003303).
文摘Background:Sepsis,a serious condition with high mortality,usually causes sepsis associated encephalopathy(SAE)that involves neuronal cell death.However,the cell death programs involved and their underlying mechanisms are not clear.This study aimed to explore the regulatory mechanisms of different cell death programs in SAE.Methods:A neonatal rat model of SAE was established by cecal ligation and perforation.Survival rate and vital signs(mean arterial pressure and heart rate)were monitored,nerve reflexes were evaluated,and cortical pathological changes were observed by hematoxylin and eosin staining.The expression of pyroptosis,apoptosis,and necroptosis(PANoptosis)-related proteins,mitogen-activated protein kinase(MAPK),and its upstream regulator toll-like receptor 9(TLR9)were detected.The expression of TLR9 in neurons was observed by immunofluorescence staining.The ultrastructure of neurons was observed by transmission electron microscope.Results:First,PANoptosis was found in cortical nerve cells of the SAE rats.Meanwhile,the subunits of MAPKs,p38 MAPK,Jun N-terminal kinase,and extracellular signal-regulated kinase(ERK)were activated.After pharmacologically inhibiting each of the subunits,only p38 MAPK was found to be associated with PANoptosis.Furthermore,blocking the p38 MAPK signaling pathway activated necroptosis but inhibited apoptosis and pyroptosis.When necroptosis was pharmacologically inhibited,apoptosis and pyroptosis were reactivated.Finally,we found that the expression of TLR9,a regulator of MAPKs,was significantly increased in this model.After down-regulation of TLR9,p38 MAPK,and ERK signaling pathways were inhibited,which led to the inhibition of PANoptosis.Further analysis found that down-regulation of TLR9 improved the survival rate and reduced the pathological changes in SAE rats.Conclusions:Our study showed that the programs comprising PANoptosis are activated simultaneously in SAE rats.TLR9 activated PANoptosis through the p38 MAPK signaling pathway.TLR9 may work as a potential target for SAE treatment.
文摘Background Astrocyte swelling is an important consequence of hepatic encephalopathy, and aquaporin-4 has been reported to play a vital role in this swelling. Ammonia causes astrocyte swelling and is also known to modulate aquaporin-4 expression in the astrocyte foot processes. The purpose of this study was to explore the mechanism of ammonia-induced aquaporin-4 expression, which has been suggested to involve the p38 mitogen-activated protein kinase pathway. Methods We exposed cultured astrocytes to ammonium chloride, an in vitro model of hepatic encephalopathy. The purity of cultured astrocytes was evaluated by fluorescent glial fibrillary acidic protein labeling; cell morphology was assessed by light microscopy; the expression of aquaporin-4, phospho-p38, and p38 were detected by Western blotting analysis. Statistical analysis was performed by one-way factorial analysis of variance, and the relationship between variables was calculated by linear regression using SPSS version 13.0 program for Windows (SPSS, Chicago, IL, USA). Results The purity of cultured astrocytes was (96.6±1.4)%. Astrocytes swelled significantly when exposed to 5 mmol/L ammonium chloride for 24 hours as compared to non-exposed astrocytes. Co-treatment with 10 μmol/L SB203580 (an inhibitor of p38) attenuated the degree of ammonium chloride induced astrocyte swelling. Western blotting analysis revealed that the expression levels of phospho-p38 and aquaporin-4 in ammonium chloride treated cells were significantly increased relative to the control group (P 〈0.001); SB203580 co-treatment inhibited the increased expression of phospho-p38 and aquaporin-4 relative to the ammonium chloride treated group (P=0.002 and P=0.015 respectively). The phosphorylation of p38 and upregulation of aquaporin-4 were highly correlated (r=0.909). There were no significant differences in total p38 expression among the groups (P=0.341). Conclusions Ammonium chloride induced upregulation of aquaporin-4 in astrocytes is regulated by the p38 mitogen-activated protein kinase pathway. Inhibiting p38 activation prevented ammonium chloride induced aquaporin-4 protein upregulation.
基金Supported by National Natural Science Foundation of China(No.81102643)Zhejiang Provincial Natural Science Foundation(No.Y2091151)+1 种基金State Administration of Traditional Chinese Medicine(Acupuncture)of Key Subjects Construction Funding(No.[2009]30)Research Fund of Zhejiang Provincial FirstForemost Key Subject-Acupuncture and Moxibustion(No.[2008]255)
文摘Objective: To investigate whether analgesic effect of electroacupuncture(EA) is affected by p38 mitogen-activated protein kinase(p38 MAPK) on microglia. Methods: There were two experiments. The experiment 1: 40 male Sprague-Dawley(SD) rats were randomly divided into the normal, surgery, EA and sham EA groups, and the L5 spinal nerve ligation(SNL) on the right side was used to establish neuropathic pain model. EA was applied to bilateral Zusanli(ST36) and Kunlun(BL60) at 24, 48 and 72 h after SNL for 30 min, once per day. The paw withdrawal thresholds(PWTs) were measured before surgery(as base) and at 24, 25, 49 and 73 h after surgery. Phospho-p38 MAPK(p-p38 MAPK), oxycocin-42(OX-42, marker of microglia), and glial fibrillary acidic protein(GFAP, marker of astrocyte) in bilateral spinal cord dorsal horn(SCDH) were detected by immunofluorescence, respectively. The experiment 2: 40 male SD rats were cannulated for SNL-induced neuropathic pain, and then were randomly divided into the dimethyl sulfoxide(DMSO), EA plus DMSO, 4-(4-fluorophenyl)-2-(4-methylsulfonylpheny)-5-(4-pyridyl)-1H-imidazole(SB203580) and EA plus SB203580 groups. SB203580(30 nmol/L) was administered 5 min prior to EA treatment. The PWTs and OX-42 in bilateral SCDH were measured as mentioned above. Results: SNL-induced neuropathic pain reduced PWTs and increased the expression of p-p38 MAPK and OX-42 in bilateral lumbar SCDH of rats(P〈0.01). Spinal p-p38 MAPK was only co-localized with OX-42 in our study. EA treatment significantly alleviated SNL-mediated mechanical hyperalgesia, and suppressed the expression of p-p38 MAPK and OX-42 in lumbar SCDH(P〈0.05 or P〈0.01). Intrathecal injection of low dose SB203580 had no influence on PWTs(P〉0.05), but significantly inhibited the expression of OX-42 positive cells in bilateral SCDH(P〈0.01 or P〈0.05). EA plus SB203580 synergistically increased PWTs, and reduced the expression of bilateral spinal OX-42(P〈0.01 or P〈0.05). Conclusions: The central mechanism of EA-induced anti-hyperalgesia may be partially associated with the reduced expression of p-p38 MAPK, and subsequently reducing the activation of OX-42 in neuropathic pain. Therefore, EA may be a new complementary and alternative therapy for neuropathic pain.
文摘OBJECTIVE:To investigate the efficacy of needling acupoins of Guanyuan(CV4),Sanyinjiao(SP6),Zusanli(ST36),Pishu(BL20),Shenshu(BL23),Zigong(EX-CA1)on the expression of p38 mitogen-activated protein kinase(p38MAPK)in ovarian tissue in rats with premature ovarian failure induced by cyclophosphamide,and to study the underlying mechanism.METHODS:Forty specific pathogen free female Sprague-Dawley rats were randomly divided into the blank group,the model group,the acupuncture group,the Western Medicine group and the Western Medicine combined with acupuncture group.Except the blank group,the rest of the rats were given with cyclophosphamide for 14 d to establish premature ovarian failure model.No intervention was conducted in the blank group and model group;the acupuncture group was given with acupuncture daily;the Western Medicine group was given with estradiol valerate(0.09 mg/kg)by intragastrical gavage daily;the combination group was given with acupuncture combined with estradiol valerate(0.09 mg/kg)daily.Each group was intervened in continuously for 14 d.After the last treatment,the levels of estradiol(E2),follicle stimulating hormone(FSH)and luteinizing hormone(LH)were detected by enzyme-linked immunosorbent assay,then the ovarian tissue was dissected.Western blot was used to detect the expression of p38 MAPK protein.RESULTS:Compared with the blank group,E2 in the serum of rats in the model group was significantly decreased(P<0.05),FSH and LH were significantly increased(P<0.05),and the expression of p38 MAPK protein in the ovarian tissue of the rats was significantly increased(P<0.05).Compared with the model group,E2 in the serum of the acupuncture group,Western Medicine group and the combination group were significantly increased(P<0.05),FSH and LH levels were significantly decreased(P<0.05),and the expression of p38MAPK protein in the ovarian tissue of the rats was significantly decreased(P<0.05).However,there was no statistically significant difference between the Western Medicine group and the acupuncture group(P>0.05).CONCLUSIONS:Acupuncture has the same effect as estrogen in interfering POF caused by cyclophosphamide,and its mechanism may be related to inhibiting the expression of p38MAPK protein in ovarian tissue and affecting the activation of p38MAPK signaling pathway.
基金Supported by the State Administration of Traditional Chinese Medicine of Guangdong Province,China(No.2009231)
文摘Objective: To investigate the underlying mechanisms of cyclovirobuxinum D(Cvb-D) on alleviating cardiac hypertrophy in rats. Methods: Sprague-Dawley rats were randomly divided into 5 groups: control group; levothyroxine-induced cardiac hypertrophy group(model); levothyroxine-induced cardiac hypertrophy + Cvb-D group(Cvb-D); levothyroxine-induced cardiac hypertrophy + captopril group(captopril); levothyroxine-induced cardiac hypertrophy + SB203580 group(SB203580), n=10 for each group. Rats were daily administered the respective drugs continuously for14 days by gastric gavage. A rat model of cardiac hypertrophy was established by intraperitoneal injection of levothyroxine to investigate whether Cvb-D protects against cardiac hypertrophy by inhibiting the p38 mitogen-activated protein kinase(MAPK) signaling pathway and preventing apoptosis of cardiac cells. Results: Treatment with Cvb-D significantly deceased left ventricle hypertrophy, improved the histopathology, hemodynamic conditions, and cardiac function in rats with cardiac hypertrophy. Compared with the normal control group, in rats with cardiac hypertrophy, expression of bax in the heart and phospho-p38 MAPK protein levels were significantly up-regulated(P〈0.01 or 0.05), whereas the bcl-2 protein level was downregulated(P〈0.01). In contrast, Cvb-D treatment reversed the changes in bax and phospho-p38 MAPK protein levels but increased the bcl-2 protein level(P〈0.01 or 0.05), and these effects were similar to those of captopril and SB203580(a specific p38 MAPK inhibitor) treatment. Furthermore, both Cvb-D, captopril and SB203580 reduced m RNA expression of p38α, p38β, c-fos, and c-jun m RNA, and Cvb-D had a stronger effect(P〈0.01). Conclusion: These results demonstrate that Cvb-D protects against cardiac hypertrophy, which is possibly mediated by prevention of cardiac cell apoptosis and inhibition of the p38 MAPK signaling pathway.
基金Supported by the National Natural Science Foundation of China: To investigate the molecular mechanism of Xiaokeping mixture on early diabetic nephropathy through the miR-192/TGF-β/Smad signal pathway (No. 81774270)the New Medical Talent Training Plan of Zhejiang Province in 2017111 Talent Training Plan in Tongde Hospital of Zhejiang Province。
文摘OBJECTIVE: To investigate the efficacy of Xiaokeping(XKP)-containing serum on the proliferation of high-glucose-induced mesangial cells(MCs)and the potential underlying mechanism.METHODS: XKP-containing serum was prepared by the intragastric administration of XKP in rats.HBZY-1 cells were cultured with normal glucose(NC group), high glucose(HG group), and high glucose with different XKP concentrations. Cell proliferation was assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay,and the cell cycle distribution was detected by flow cytometry. The expression of p38 mitogen-activated protein kinase(p38 MAPK) pathway components in MCs was detected by Western blotting and quantitative real-time polymerase chain reaction.RESULTS: The MC proliferation level in the high-glucose group was significantly higher than that in the normal control group, and XKP suppressed the HG-induced proliferation of MCs dose dependently. Moreover, flow cytometry revealed that XKP blocked cell cycle progression by inducing cell cycle arrest in G1 phase and inhibiting S phase entry. XKP down-regulated the protein and m RNA expression of p38 MAPK in MCs(P < 0.05 vs HG).CONCLUSION: The present study demonstrated that XKP-containing serum inhibits high-glucoseinduced proliferation of MCs by causing cell cycle arrest at G1 phase and inhibiting S phase entry. The underlying mechanism involves the down-regulation of the p38 MAPK signaling pathway, providing a theoretical basis for the use of XKP to treat diabetic kidney disease.
基金This work was supported by the National Basic Research Program of China(973 Program)(No.2002CB513005)the National Natural Science Foundation of China(Grant No.30572151)+1 种基金Guangdong Provincial Science and Technology Program(No.A1090202)the Medical Science and Technology Foundation of Guangdong Province(No.A2005367).
文摘The aim of this study was to investigate the role of p38 mitogen-activated protein kinase(MAPK)in cell migration induced by platelet-derived growth factor(PDGF).Western blot was performed to detect the phosphorylation of p38 in NIH3T3 cells treated with PDGF.A Transwell cell migration system was used to determine the effects of PDGF treatment on the migration of NIH3T3 cells and the influence of p38 deficiency on this process in a p38 gene knockout(p38^(−/−))mouse embryonic fibroblast cell line.On the stimulation of PDGF,the migration of NIH3T3 cells was significantly increased(P<0.001)compared to the control and p38 MAP kinase was simultaneously phosphorylated.Furthermore,the PDGF-induced cell migration was significantly blocked in p38 gene knockout(p38^(−/−))mouse embryonic fibroblasts(MEFs)(P<0.001)as compared with the wild type cells(p38+/+).p38 MAPK plays an important role in the regulation of cell migration induced by PDGF.