Timosaponin AⅢ induces drug-metabolizing enzymes by activating constitutive androstane receptor (CAR) via dephosphorylation of the EGFR signaling pathway

The current study aimed to assess the effect of timosaponin AⅢ(T-AⅢ)on drug-metabolizing enzymes during anticancer therapy.The in vivo experiments were conducted on nude and ICR mice.Following a 24-day administration of T-AⅢ,the nude mice exhibited an induction of CYP2B10,MDR1,and CYP3A11 expression in the liver tissues.In the ICR mice,the expression levels of CYP2B10 and MDR1 increased after a three-day T-AⅢ administration.The in vitro assessments with HepG2 cells revealed that T-AⅢ induced the expression of CYP2B6,MDR1,and CYP3A4,along with constitutive androstane receptor(CAR)activation.Treatment with CAR siRNA reversed the T-AⅢ-induced increases in CYP2B6 and CYP3A4 expression.Furthermore,other CAR target genes also showed a significant increase in the expression.The up-regulation of murine CAR was observed in the liver tissues of both nude and ICR mice.Subsequent findings demonstrated that T-AⅢ activated CAR by inhibiting ERK1/2 phosphorylation,with this effect being partially reversed by the ERK activator t-BHQ.Inhibition of the ERK1/2 signaling pathway was also observed in vivo.Additionally,T-AⅢ inhibited the phosphorylation of EGFR at Tyr1173 and Tyr845,and suppressed EGF-induced phosphorylation of EGFR,ERK,and CAR.In the nude mice,T-AⅢ also inhibited EGFR phosphorylation.These results collectively indicate that T-AⅢ is a novel CAR activator through inhibition of the EGFR pathway.

Fanlian Huazhuo Formula alleviates high-fat diet-induced nonalcoholic fatty liver disease by modulating autophagy and lipid synthesis signaling pathway

BACKGROUND Fanlian Huazhuo Formula(FLHZF)has the functions of invigorating spleen and resolving phlegm,clearing heat and purging turbidity.It has been identified to have therapeutic effects on type 2 diabetes mellitus(T2DM)in clinical application.Non-alcoholic fatty liver disease(NAFLD)is frequently diagnosed in patients with T2DM.However,the therapeutic potential of FLHZF on NAFLD and the underlying mechanisms need further investigation.AIM To elucidate the effects of FLHZF on NAFLD and explore the underlying hepatoprotective mechanisms in vivo and in vitro.METHODS HepG2 cells were treated with free fatty acid for 24 hours to induce lipid accumulation cell model.Subsequently,experiments were conducted with the different concentrations of freeze-dried powder of FLHZF for 24 hours.C57BL/6 mice were fed a high-fat diet for 8-week to establish a mouse model of NAFLD,and then treated with the different concentrations of FLHZF for 10 weeks.RESULTS FLHZF had therapeutic potential against lipid accumulation and abnormal changes in biochemical indicators in vivo and in vitro.Further experiments verified that FLHZF alleviated abnormal lipid metabolism might by reducing oxidative stress,regulating the AMPKα/SREBP-1C signaling pathway,activating autophagy,and inhibiting hepatocyte apoptosis.CONCLUSION FLHZF alleviates abnormal lipid metabolism in NAFLD models by regulating reactive oxygen species,autophagy,apoptosis,and lipid synthesis signaling pathways,indicating its potential for clinical application in NAFLD.

Acupuncture at Back-Shu point improves insomnia by reducing inflammation and inhibiting the ERK/NF-κB signaling pathway

BACKGROUND Insomnia is a disease where individuals cannot maintain a steady and stable sleep state or fail to fall asleep.Western medicine mainly uses sedatives and hypnotic drugs to treat insomnia,and long-term use is prone to drug resistance and other adverse reactions.Acupuncture has a good curative effect and unique advantages in the treatment of insomnia.AIM To explore the molecular mechanism of acupuncture at Back-Shu point for the treatment of insomnia.METHODS We first prepared a rat model of insomnia,and then carried out acupuncture for 7 consecutive days.After treatment,the sleep time and general behavior of the rats were determined.The Morris water maze test was used to assess the learning ability and spatial memory ability of the rats.The expression levels of inflammatory cytokines in serum and the hippocampus were detected by ELISA.qRTPCR was used to detect the mRNA expression changes in the ERK/NF-κB signaling pathway.Western blot and immunohistochemistry were carried out to evaluate the protein expression levels of RAF-1,MEK-2,ERK1/2 and NF-κB.RESULTS Acupuncture can prolong sleep duration,and improve mental state,activity,diet volume,learning ability and spatial memory.In addition,acupuncture increased the release of 1L-1β,1L-6 and TNF-αin serum and the hippocampus and inhibited the mRNA and protein expression of the ERK/NF-κB signaling pathway.CONCLUSION These findings suggest that acupuncture at Back-Shu point can inhibit the ERK/NF-κB signaling pathway and treat insomnia by increasing the release of inflammatory cytokines in the hippocampus.

MIR-448 Regulates MAGEA6/AMPK Signaling Pathway in Hepatocellular Carcinoma Tumor Stem Cells

Objective: To explore the role of miR-448 in regulating MAGEA6/AMPK signaling pathway in the biological study of hepatocellular carcinoma (HCC) tumor stem cells. Methods: Using the database, the hepatocellular carcinoma related expression chips were obtained and the regulatory mirnas of candidate genes were predicted, and the predicted results were analyzed. The effects of miR-448 and MAGEA6 on the pellet formation rate and clone formation rate of hepatocellular carcinoma stem cells were detected by immunofluorescence identification of stem cell markers and light microscope counting method. The effects of miR-448 and MAGEA6 on migration and invasion of hepatocellular carcinoma stem cells were detected by scratch and Transwell assay. Dual luciferase reporter assay to verify whether miR-448 targets MAGEA6. The expression and influence of miR-448 on MAGEA6 and AMPK pathway were detected by qRT-PCR and Western blot. Results: It was found that miR-448 may directly regulate the expression of MAGEA6. Overexpression of miR-448 inhibited the characteristics, proliferation, migration, and invasion of hepatocellular carcinoma stem cells in vitro, as well as the ability of xenograft tumor formation in vivo. However, inhibition of miR-448 showed opposite results. In addition, miR-448 directly targets MAGEA6 and regulates AMPK signaling. Silencing MAGEA6 and adding AMPK activator further verified that miR-448 activated AMPK signaling pathway by targeting MAGEA6, thus affecting characteristics, proliferation, migration and invasion of hepatoma stem cells. Conclusions: Our results reveal that miR-448 activates AMPK signaling pathway by targeting MAGEA6, thereby affecting characteristics, proliferation, migration and invasion of hepatoma stem cells. It is suggested that overexpression of miR-448 may be a new therapeutic strategy for hepatocellular carcinoma.

Effect and Mechanism of Dicliptera chinensis Polysaccharide on miR-141/AMPK/SIRT1 Signaling Pathway in Rats with NAFLD

[Objectives]Non-alcoholic fatty liver disease(NAFLD)rat model was established by feeding high-fat and high-sugar fodder to rats,and the protective effect of Dicliptera chinensis polysaccharide(DCP)on NAFLD rats was studied to explore its potential mechanism.[Methods]45 SD rats were randomly divided into 4 groups:normal control group,model control group and DCP treatment groups(100 and 300 mg/kg).The rats in the normal control group were fed with ordinary fodder,and the rats in other groups were fed with high-fat and high-sugar diet for 14 weeks to establish NAFLD model.From the 9^(th)week,the rats in the DCP treatment groups were given different doses of DCP by intragastric administration(5 mL/kg)for 6 weeks.After the last intragastric administration,the rats fasted for 16 h,and the serum and liver of rats were collected for detection.Hematoxylin-eosin(HE)staining was conducted to observe the histopathological changes of rat liver,and alanine aminotransferase(ALT),aspartate aminotransferase(AST),superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),malondialdehyde(MDA),triglyceride(TG),total cholesterol(TC),low density lipoprotein cholesterol(LDL-C),and high density lipoprotein cholesterol(HDL-C)were detected by biochemical method.Interleukin-6(IL-6),interleukin-1β(IL-1β),tumor necrosis factor(TNF-α)and micrornA-141(micro RNA-141)were detected by reverse transcription-polymerase chain reaction(RT-PCR).The expression of SIRT1 and adenosine 5'-monophosphate(AMP)-activated protein kinase(AMPK)in rat liver was detected by western blot.[Results]Compared with the model control group,the inflammatory damage and steatodegeneration of rats in the DCP groups were relieved to varying degrees,and the number of lipid vacuoles significantly reduced.The ALT,AST,TC,TG and LDL-C content in the serum and MDA content in the liver tissue decreased to varying degrees,while the HDL-C,SOD and GSH-Px content increased.The expression of SIRT1 and AMPK increased,while the expression of miR-141,TNF-α,IL-6 and IL-1βdeclined,and the DCP 300 mg/kg treatment group had better improvement effect.[Conclusions]DCP had a certain protective effect on NAFLD rats,which may be related to the regulation of miR-141/AMPK/SIRT1 signaling pathway.

Puerarin protects rat brain against ischemia/reperfusion injury by suppressing autophagy via the AMPK-mT OR-ULK1 signaling pathway

Puerarin suppresses autophagy to alleviate cerebral ischemia/reperfusion injury, and accumulating evidence indicates that the AMPKm TOR signaling pathway regulates the activation of the autophagy pathway through the coordinated phosphorylation of ULK1. In this study, we investigated the mechanisms underlying the neuroprotective effect of puerarin and its role in modulating autophagy via the AMPK-m TOR-ULK1 signaling pathway in the rat middle cerebral artery occlusion model of cerebral ischemia/reperfusion injury. Rats were intraperitoneally injected with puerarin, 50 or 100 mg/kg, daily for 7 days. Then, 30 minutes after the final administration, rats were subjected to transient middle cerebral artery occlusion for 90 minutes. Then, after 24 hours of reperfusion, the Longa score and infarct volume were evaluated in each group. Autophagosome formation was observed by transmission electron microscopy. LC3, Beclin-1 p62, AMPK, m TOR and ULK1 protein expression levels were examined by immunofluorescence and western blot assay. Puerarin substantially reduced the Longa score and infarct volume, and it lessened autophagosome formation in the hippocampal CA1 area following cerebral ischemia/reperfusion injury in a dose-dependent manner. Pretreatment with puerarin（50 or 100 mg/kg） reduced Beclin-1 expression and the LC3-II/LC3-I ratio, as well as p-AMPK and p S317-ULK1 levels. In comparison, it increased p62 expression. Furthermore, puerarin at 100 mg/kg dramatically increased the levels of p-m TOR and p S757-ULK1 in the hippocampus on the ischemic side. Our findings suggest that puerarin alleviates autophagy by activating the APMK-m TOR-ULK1 signaling pathway. Thus, puerarin might have therapeutic potential for treating cerebral ischemia/reperfusion injury.

Endogenous hydrogen sulfide and ERK1/2-STAT3 signaling pathway may participate in the association between homocysteine and hypertension

Background Homocysteine(Hcy)is a risk factor for hypertension,although the mechanisms are poorly understood.Methods We first explored the relationship between Hcy levels and blood pressure(BP)by analyzing the clinical data of primary hypertensive patients admitted to our hospital.Secondly,we explored a rat model to study the effect of Hcy on blood pressure and the role of H2S.An hyperhomocysteinemia(HHcy)rat model was induced to explore the effect of Hcy on blood pressure and the possible mechanism.We carried out tissue histology,extraction and examination of RNA and protein.Finally,we conducted cell experiments to determine a likely mechanism through renin-angiotensin-aldosterone system(RAAS)and extracellular signal-regulated kinase 1/2(ERK1/2)signaling pathway.Results In primary hypertensive inpatients with HHcy,blood pressure was significantly higher as compared with inpatient counterparts lacking HHcy.In the rat model,blood pressure of the Wistar rats was significantly increased with increases in serum Hcy levels and decreased after folate treatment.Angiotensin converting enzyme 1(ACE1)expression in the Wistar Hcy group was enhanced comparing to controls,but was decreased in the Wistar folate group.Angiotensin II receptor type 1(AGTR1)levels in the kidney tissue increased in the Wistar folate group.Both serum H2S and kidney cystathionineγ-lyase decreased with elevated levels of serum Hcy.In vitro,increased concentrations and treatment times for Hcy were associated with increased expression of collagen type 1 and AGTR1.This dose and time dependent response was also observed for p-STAT3 and p-ERK1/2 expression.Conclusion Endogenous H2S might mediate the process of altered blood pressure in response to changes in serum Hcy levels,in a process that is partly dependent on activated RAAS and ERK1/2-STAT3 signaling pathway.

MEK/ERK signaling pathway in apoptosis of SW620 cell line and inhibition effect of resveratrol

Objective:To study the involvement of MAPK MEK/ERK signaling transduction pathway in the apoptosis process of SW620 tumor cell line and the inhibition effect of resveratrol.Methods:SW620 cell lines were divided into 5 groups,namely,control group.PD98059 group,low-dose resveratrol group,mid-dose resveratrol group and high-dose resveratrol group.The inhibition rate of cell proliferation was detected by MTT method.The expression of apoptotic molecules and MEK/ERK signaling pathway related proteins were assayed by realtime PCR and Western blotting.Results:Compared with control group,the proliferation of cells treated with resveratrol was significantly inhibited.In the case of apoptotic molecules,the expression of Bax,Caspase 3 and Caspase 9 was increased significantly while the expression of anti-apoptotic molecule Bcl2 was decreased significantly in resveratrol groups with a dosedependent manner.In the case of molecules in MEK/ERK signaling pathway,the expression of Ras,Raf,MEK and ERKl/2 was decreased significantly in resveratrol groups with a dose-dependent manner.Conclusions:PD98059 and resveratrol can effectively inhibit the proliferation of SW620 through inhibiting the MEK/ERK signaling pathway.

The role of ERK1/2 signaling pathway in coronary microembolization-induced rat myocardial inflammation and injury

Objectives In this work,we explore the effect of atorvastatin on myocardial apoptosis and caspase-8 acti- vation after coronary microembolization(CME) in rats. Methods Fifty rats were randomly divided into five groups; the coronary microembolization(CME) group,the sham-operated (sham) control group,the gastric lavage control group, the atorvastatin lavage group,and the caspasse-8 inhibitor (N-acetyl-Ile-Glu-Thr-Asp-CHO,abbreviated as CHO) group,with 10 rats for each group.A microembolization ball was injected through the left ventricle for constructing the CME model.Animals in the sham control group were given an injection of physiological saline instead of the microembolization ball.Seven days before the operation,the atorvastatin group underwent gastric lavage with 20 mg/kg of atorvastatin once a day.Gastric lavage control animals underwent gastric lavage with an equivalent dose of physiological saline instead of the atorvastatin.Animals in the CHO group were given an intraperitoneal injection of 10 mg/kg of CHO 30 min before the operation.Six hours after the operation,cardiac ultrasonic detection was conducted on each group to measure the cardiac function indexes.TUNEL(Terminal-deoxynucleoitidyl transferase mediated dUTP nick end labeling) assays were used to measure myocardial apoptosis,and western blots were used to quantify the expression levels of activated caspase-3 and -8.Results(1) The echocardiographic parameters showed that,compared to the sham control animals,the left ventricular ejection fraction(LVEF) of the CME group was significantly decreased(P【0.05).In addition, cardiac sonography revealed a decrease in the left ventricular shortening fraction(FS) and cardiac output(CO), but an increase in the left ventricular end-diastolic dimension (LVEDd).Compared to the CME group,the atorvastatin and CHO groups exhibited significantly improved cardiac function (P【0.05).(2) When compared with the sham control,the myocardical apoptotic rate of the CME group,as well as the levels of activated caspase-3 and-8,increased significantly (P【0.05).The myocardial apoptotic rate,as well as the levels of activated caspase-3 and caspase-8 in the atorvastatin and CHO groups,decreased significandy(P【0.05) in comparison to the CME group.Conclusions The atorvastatin pretreatment clearly suppressed post-CME myocardial apoptosis and improved cardiac function.The most likely mechanism for these effects is the blockade of the myocardial death receptor -mediated apoptosis pathway.

Irisin Attenuates Osteoarthritis by Inhibiting Apoptosis of Osteocytes Through Activating Erk Signaling Pathway

Osteoarthritis(OA)is an inflammatory disease involving the joints that is prevalent in the global aging population.The purpose of this study is to determine whether irisin can attenuate osteoarthritis(OA)progression in anterior cruciate ligament transection(ACLT)mice models and the mechanism of irisin therapy effect on OA by increase the resistance of apoptosis in MLO-Y4 cells induced by mechanical stretch in vitro.Methods For in vivo study,3-month-old male C57BL/6 J mice were randomized to three groups,sham-operated,anterior cruciate ligament transection(ACLT)-operated treated with vehicle,and ACLT-operated treated with irisin by intraperitoneal injection once a week.Cartilage erosion was observed by HE staining.Osteoarthritis Research Society International(OARSI)scores were evaluated according to the safranin O stai-ning.The microstructure of tibia cortical bone,trabecular bone,and subchondral bone was analyzed by micro-CT and the bone histomorphometry has been administrated including mineral apposition rate(MAR).Edu staining and cck-8 were used for the detection of the proliferation of MLO-Y4 cells.For mechanical stress,cells were seeded on the collagen-I coated chamber subjected with a peak biaxial stretch of 20%at 1 Hz for 16 hours to induce apoptosis.Flow cytometry was used for the detection of apoptosis and cell cycle.TUNNEL was used for staining the apoptotic cells and rt-PCR was applied for quantifying the expression of mRNA such as Bax,Bcl-2,SOST,c-myc,Opg.Western blot was utilized to confirm the mechanism of how irisin decrease the osteocyte apoptosis.Results In vivo,irisin can attenuate articular cartilage degeneration.Irisin maintains the proportion of hyaline cartilage and calcified cartilage and keep fewer cartilage erosions in ACLT-operated mice.For immunohistochemical(IHC)staining,irisin reduced the expression of caspase3,Bax and matrix metalloproteinase-13 in both cartilage and subchondral bone.Irisin-treated ACLT group shows higher Trabecular number(Tb.N)and bone volume fraction(BV/TV)compared to the vehicle-treated ACLT group.In vitro, irisin significantly increased the proliferation of MLO-Y4 cells detected by Edu and Ki67 staining,and irisin can protect the cells from both mechanical stretchinduced apoptosis detected by FITC-PI flow cytometry and maintain the cell activity by regulating the expression of Bax,Bcl-2,and c-myc.Transcriptome sequencing shows that irisin significantly activates the MAPK signaling pathway and we confirm the result by western blot:irisin effectively activates the Erk signaling pathway through phosphorylation and has a certain activation effect on p38 signaling pathway,no activation was observed for FAK signaling pathway.Conclusions Irisin can attenuate the progression of OA by decrease the apoptosis of osteocyte,which can improve the microarchitecture of subchondral bone.Erk pathway activation plays an important role in reducing the apoptosis of osteocyte.

Maleylated-BSA induces TNF-α production through the ERK and NF-κB signaling pathways in murine RAW264.7 macrophages

Ligands for macrophage scavenger receptors are reported to induce a wide range of host cell responses, including the production of inflammatory cytokines;however, the underlying mechanisms have not yet been fully understood and which remain obscure. In this study, we have examined the effect of maleylated bovine serum albumin (maleylated-BSA), a well-known ligand of the scavenger receptor, on the murine macrophage cell line RAW264.7. Maleylated-BSA strongly induced the production of tumor necrosis factor-α (TNF-α) and induced phosphorylation of extracellular signal-regulated kinase (ERK) and NF-kB p65. We also observed that maleylated-BSA-induced TNF-α production was blocked by the ERK inhibitor U0126. Together, these data demonstrates that maleylated-BSA- induced production of TNF-α requires the ERK/NF-κB signaling cascade in murine RAW- 264.7 macrophages.

Loganin regulates glycolipid metabolism by influencing intestinal microbiota and AMPK signaling in obese mice

Objective: We aimed to observe the effects of loganin(Log) on serum glycolipid levels and probe the mechanisms focusing on intestinal flora and AMP-activated protein kinase(AMPK) signaling in obese mice.Methods: A high-fat diet was given for 12 consecutive weeks to generate the obesity model in institute of cancer research(ICR) mice. Body weight was measured weekly and fasting blood glucose(FBG) was determined every 2 weeks. Both the oral glucose tolerance test and the intraperitoneal insulin tolerance test were performed. The serum levels of total cholesterol(TC), triglyceride, high-density lipoproteincholesterol, low-density lipoprotein-cholesterol(LDL-C), and free fatty acids(FFA) were measured. The expression of key proteins in the AMPK signaling pathway in skeletal muscle tissue was detected by immunoblotting, and gut microbiota were characterized using 16S rDNA sequencing.Results: Log significantly decreased the body weight and the FBG in obese mice(P <.05), and it could restore FBG to normal levels. The total cholesterol, LDL-C, and FFA levels were significantly reduced by Log compared with the obese controls(TC: P =.0020;LDL-C: P =.0233;FFA: P =.0127), and the glucose tolerance of animals was significantly improved(P =.0477). The western blot results showed that Log could upregulate the protein expression of Adenosine 5‘-monophosphate(AMP)-activated protein kinase(AMPKa), Sirtuin 1(SIRT1), and peroxisome proliferator-activated receptor-gamma coactivator-1 alpha(PGC1a) in skeletal muscle tissue of obese mice. 16S rDNA sequencing indicated that Log reduced the diversity of the gut flora in feces and altered the floral composition of obese mice.Conclusions: Log was effective in reducing body weight and improving glucolipid metabolism in obese mice, probably through activating AMPK signaling and regulating intestinal microbial diversity.

Yiqi Yangyin and Huatan Quyu granule can improve skeletal muscle energy metabolism in a type 2 diabetic rat model by promoting the AMPK/SIRT/PGC-1α signalling pathway

Objective:To investigate how Yiqi Yangyin and Huatan Quyu granule (YYHO) improves skeletal muscle insulin resistance in a type 2 diabetic rat model and to discover whether the molecular mechanism is related to the promotion of the AMPK/SIRT/PGC-1α signalling pathway.Methods:Rats were randomly divided into 4 groups:the normal group,the model group,the YYHQ granule group,and the pioglitazone group.The type 2 diabetic rat model was established by feeding a high-fat diet for 5 weeks along with a single intraperitoneal injection of 30 mg/kg streptozotocin (STZ).After modelling successfully,the appropriate drug was intragastrically administered to diabetic rats for 2 weeks,once per day.The YYHQ granule group was given a dose of 4.8 g/kg body weight per day,the pioglitazone group was given a dose of 1.35 mg/kg body weight per day.The doses for both groups were equivalent to the clinical equivalent dose based on a previous study.Other groups were gavaged with the same amount of saline water.Body weight,food intake,water intake,urine volume and grip strength were recorded weekly.The fasting blood glucose(FBG) was determined weekly using blood glucose test strips.The related glucose and lipid metabolism indexes,e.g.,fasting insulin (Fins),glycated haemoglobin (GHb),HOMA-IR,ISI,triglycerides (TG),total cholesterol (TC),high-density lipoprotein cholesterol (HDL-C),low-density lipoprotein cholesterol (LDL-C) and free fatty acid (FFA),were determined using biochemical method.The mRNA expression levels of adenosine monophosphate-activated protein kinase (AMPK),peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1α),carnitine palmitoyl transterase-1 (CPT-1),Sirtuin 1 (SIRT1),and Sirtuin 3 (SIRT3) were assessed using quantitative real-time PCR (qRT-PCR).The protein expression levels of creatine kinase (CK),Ca2+ ATPase,α-Actin,AMPK,PGC-1α and CPT-1 were determined using enzyme-linked immunosorbent assay method (ELISA).Results:Body weight decreased significantly (P <.01),food intake,water intake and urine volume increased significantly (P <.01),and grip strength decreased significantly (P <.01) in the model group compared with the normal group.The levels of FBG,Fins,GHb and HOMA-IR increased significantly (P <.01),and the ISI decreased significantly (P <.01) in the model group.The levels of TG,TC,LDL-C and FFA increased significantly (P <.05 or P <.01),and the level of HDL-C decreased significantly (P <.05) in the model group.These changes were reversed after treatment with YYHQ granule or pioglitazone.Compared with the model group,the YYHQ granule and pioglitazone groups significantly improve body weight,water intake and urine volume (P <.05 or P <.01),however,both treatments had no significant effect on food intake (P >.05).The levels of FBG,Fins,GHb,HOMA-IR and ISI were improved significantly (P <.01) and the levels of TG,TC and LDL-C were improved significantly (P <.05 or P <.01),however,both treatments had no significant effect on the levels of HDL-C and FFA (P >.05).Further results indicated that YYHQ granule significantly decreased the mRNA expression of AMPK,PGC-1α,CPT-1,SIRT1 and SIRT3 in skeletal muscle (P <.01) and the pioglitazone group showed similar effects;moreover,the protein expression levels of CK,Ca2+ATPase,α-Actin,AMPK,PGC-1α and CPT-1 in skeletal muscle significantly decreased (P <.01),however,pioglitazone had no significant effect on CK and α-Actin (P >.05).Conclusion:The possible molecular mechanism of YYHQ granule improving skeletal muscle insulin resistance in a type 2 diabetic rat model may be related to the stimulation of energy metabolism in skeletal muscle via the AMPK/SIRT/PGC-1α signalling pathway.

Estrogen up-regulates MMP2/9 expression in endometrial epithelial cell via VEGF-ERK1/2 pathway

Objective:To study the effect of estrogen on anovulatory dysfunctional uterine bleeding(ADUB).Methods:Primary endometrial epithelial cells of Hainan Lizu female was cultured and hydrolylic activity of gelalinase was determined by gelatin zymography analysis.Cellular mRNA and protein synthesis was blocked respectively to determine whether the increased expression of MMP-2/9 was induced by estrogen.The expression of VEGF was blocked by siRNA.After treatment with various factors.MMP-9,VEGF,total Erk and phosphorylated Erk expression in primary uterine epithelial cells was detected by Western blotting analysis.Cell MMP-2/9mRNA levels was measured by real-time RT-PCR.Results:The activity and expression of MMP2/9 was inereased in the endometrium of patients with ADUB.Estrogen could up-regulate the expression of VEGF and activate Erk 1/2-Elk1 signal path.After interference by siRNA,ERK1/2 pathway was blocked in cells,and the expression of MMP-2/9 was down-regulated.ERK1/2 specific blocker U0126 blocked ERK phosphorylation,and it could down-regulate the expression of MMP-2/9.Conclusions:The results showed that the estrogen can increase the expression of VEGF,and thus activate ERK1/2 pathway to induce MMP-2/9 expression.

女贞子提取物对帕金森病大鼠的神经炎症及AMPK/ERK信号通路的影响

目的:探讨女贞子提取物(LLE)对帕金森病(PD)大鼠神经炎症以及腺苷酸激活蛋白激酶(AMPK)/细胞外调节蛋白激酶(ERK)信号通路的影响。方法:通过注射6-羟基多巴胺(6-OHDA)构建PD大鼠模型,将建模成功的大鼠随机分为模型组、LLE低、中、高剂量组、阳性对照组,每组15只;另取15只正常大鼠作为对照组;LLE低、中、高剂量组分别给予0.2 g/kg、0.4 g/kg、0.8 g/kg LLE灌胃,阳性对照组给予1.67 mg/kg美多芭灌胃,对照组、模型组大鼠灌胃等体积生理盐水,每天1次,连续15d。干预结束后,利用旋转试验检测大鼠行为学变化;利用酶联免疫吸附(ELISA)法测定大鼠脑组织中氧化应激指标[丙二醛(MDA)、还原型谷胱甘肽(GSH)、超氧化物歧化酶(SOD)],炎症因子[肿瘤坏死因子α(TNF-α)、一氧化氮(NO)]水平;采用免疫组化法检测多巴胺标志物酪氨酸羟化酶(TH)阳性细胞数;采用蛋白免疫印迹(western blotting)法检测PD大鼠脑组织中AMPK、ERK、p-AMPK、p-ERK表达。结果:与对照组相比,模型组大鼠旋转圈数及脑组织MDA、TNF-α、NO含量均增加(P<0.05),TH阳性细胞数,GSH、SOD水平及p-AMPK/AMPK、p-ERK/ERK比值均降低(P<0.05);与模型组相比,LLE随着剂量增加,大鼠旋转圈数、MDA、TNF-α、NO水平降低(P<0.05),TH阳性细胞数,GSH、SOD水平及p-AMPK/AMPK、p-ERK/ERK比值升高(P<0.05);LLE高剂量组各项指标与阳性对照组比较差异无统计学意义(P>0.05)。结论:LLE可以抑制PD大鼠氧化应激损伤,缓解大鼠炎性反应,其机制可能与激活AMPK/ERK信号通路有关。

Protective effects of Yishen Sanjie Huayu compound on the renal artery disease in rats with IgA nephropathy through ERK/NF-κB pathway

Objective:To observe the effect of Yishen Sanjie Huayu compound prescription on ERK/NF-κB signaling pathway in IgA nephropathy(IgAN)rats,and explore its effect on preventing and treating IgA nephropathy intrarenal arteriole disease.Methods:Fifty-five male SD rats were randomly divided into blank group,model group,ShenfukangⅡcapsule group and Losartan potassium tablet group.Bovine serum albumin(BSA)was used for intragastric administration and carbon tetrachloride(CCl4).IgAN rat model was established by subcutaneous injection and lipopolysaccharide(LPS)tail vein injection.ShenfukangⅡcapsule group and Losartan potassium tablet group were given each drug suspension 2ml/head/d one week after modeling Gavage was started.The blank group and the model group were given an equal volume of normal saline.The 24h urine protein(UTP)of the rats was measured at 4,8,and 12 weeks after the administration,and the blood creatinine(SCr)was measured after 12 weeks.,urea nitrogen(BUN),aldosterone(ADS),angiotensinⅡ(AngⅡ),immunohistochemical Envi-sion System two-step method to detect vascular endothelial growth factor(VEGF)and human matrix in the whole rat kidney and small artery area The expression of metalloproteinase-9(MMP-9),proliferating cell nuclear antigen(PCNA),extracellular regulatory protein kinase(ERK)1/2,nuclear transcription factor-κB(NF-κB),and the small arteries of rat kidney tissue The intima,media,vessel wall/vascular outer diameter value.Results:Compared with the model group,the expressions of VEGF,MMP-9,PCNA,ERK1/2 and NF-κB in kidney tissues of the ShenfukangⅡcapsule group and the Losartan potassium tablet group decreased(P<0.05),24hUTP and SCr,BUN level decreased(P<0.05),kidney tissue damage was alleviated;intima and vessel wall/vascular outer diameter values were significantly reduced(P<0.01),there was no significant difference in ADS between the groups.The AngⅡof the Tanpotassium tablets group was lower than that of the model group(P<0.05).Conclusion:Yishen Sanjie Huayu compound can inhibit the ERK/NF-κB signaling pathway in rats with IgA nephropathy,reduce the levels of VEGF,MMP-9,PCNA,ERK1/2,NF-κB,and inhibit intrarenal arteriole vascular endothelial cells Proliferate and reduce kidney damage.

Dietary choline activates the Ampk/Srebp signaling pathway and decreases lipid levels in Pacific white shrimp(Litopenaeus vannamei)

An 8-week feeding trial was conducted in Pacific white shrimp(Litopenaeus vannamei)to evaluate the effects of dietary choline supplementation on choline transport and metabolism,hepatopancreas histological structure and fatty acid profile,and regulation of lipid metabolism.Six isonitrogenous and isolipidic diets were formulated to contain different choline levels of 2.91(basal diet),3.85,4.67,6.55,10.70 and 18.90 g/kg,respectively.A total of 960 shrimp(initial weight,1.38±0.01 g)were distributed randomly into twenty-four 250-L cylindrical fiber-glass tanks,with each diet assigned randomly to 4replicate tanks.The results indicated that dietary choline significantly promoted the deposition of choline,betaine and carnitine(P<0.05).The diameters and areas of R cells,total lipid and triglyceride contents in hepatopancreas,and triglyceride and non-esterified fatty acid contents in hemolymph were negatively correlated with dietary choline level.The contents of functional fatty acids in hepatopancreas,the activity of acetyl-CoA carboxylase(Acc),and the mRNA expression of fas,srebp and acc were highest in shrimp fed the diet containing 4.67 g/kg choline,and significantly higher than those fed the diet containing 2.91 g/kg,the lowest level of choline(P<0.05).The number of R cells,content of very lowdensity lipoprotein(VLDL),activities of carnitine palmitoyl-transferase(Cpt1),lipoprotein lipase and hepatic lipase,and the mRNA expression levels of cpt1,fabp,fatp,ldlr,and ampk in hepatopancreas increased significantly as dietary choline increased(P<0.05).In addition,hepatopancreas m RNA expression levels of ctl1,ctl2,oct1,badh,bhmt,ck,cept,and cct were generally up-regulated as dietary choline level increased(P<0.01).In conclusion,dietary choline promoted the deposition of choline and its metabolites by up-regulating genes related to choline transport and metabolism.Moreover,appropriate dietary choline level promoted the development of hepatopancreas R cells and maintained the normal accumulation of lipids required for development,while high dietary choline not only promoted hepatopancreas lipid export by enhancing VLDL synthesis,but also promoted fatty acidβ-oxidation and inhibited de novo fatty acid synthesis by activating the Ampk/Srebp signaling pathway.These findings provided further insight and understanding of the mechanisms by which dietary choline regulated lipid metabolism in L.vannamei.

Effect of Guizhi Fuling Pill combined with GnRH analog on cell proliferation and invasion as well as MEK/ERK pathway in endometriosis lesions

Objective: To study the effect of Guizhi Fuling Pill combined with gonadotropin-releasing hormone analog (GnRH-a) on cell proliferation and invasion as well as MEK/ERK pathway in endometriosis lesions. Methods: Patients who were diagnosed with endometriosis in Bazhong Hospital of Traditional Chinese Medicine between November 2014 and March 2017 were selected as the research subjects and randomly divided into two groups, observation group received preoperative Guizhi Fuling Pill combined with GnRH analog therapy, and control group received preoperative GnRH analog monotherapy. After surgical resection, the endometriosis lesion was collected to determine the mRNA expression of proliferation and invasion-related genes as well as the protein expression of MEK/ERK pathway molecules. Results: Id-1, Sema3A, c-IAP1, OPN and uPA mRNA expression as well as p-MEK, p-EKR1/2, caspase-3 and MMP2 protein expression in endometriosis lesion of observation group were significantly lower than those of control group while Bak, Smac, PAI-1, TIMP1 and TIMP2 mRNA expression as well as caspase-3 protein expression were significantly higher than those of control group. Conclusion: Guizhi Fuling Pill combined with GnRH analog can inhibit the cell proliferation and invasion as well as the MEK/ERK pathway activation in endometriosis lesions.

Cytokine receptor-like factor 1(CRLF1)promotes cardiac fibrosis via ERK1/2 signaling pathway

Cardiac fibrosis is a cause of morbidity and mortality in people with heart disease.Anti-fibrosis treatment is a significant therapy for heart disease,but there is still no thorough understanding of fibrotic mechanisms.This study was carried out to ascertain the functions of cytokine receptor-like factor 1(CRLF1)in cardiac fibrosis and clarify its regulatory mechanisms.We found that CRLF1 was expressed predominantly in cardiac fibroblasts.Its expression was up-regulated not only in a mouse heart fibrotic model induced by myocardial infarction,but also in mouse and human cardiac fibroblasts provoked by transforming growth factor-β1(TGF-β1).Gain-and loss-of-function experiments of CRLF1 were carried out in neonatal mice cardiac fibroblasts(NMCFs)with or without TGF-β1 stimulation.CRLF1 overexpression increased cell viability,collagen production,cell proliferation capacity,and myofibroblast transformation of NMCFs with or without TGF-β1 stimulation,while silencing of CRLF1 had the opposite effects.An inhibitor of the extracellular signal-regulated kinase 1/2(ERK1/2)signaling pathway and different inhibitors of TGF-β1 signaling cascades,comprising mothers against decapentaplegic homolog(SMAD)-dependent and SMAD-independent pathways,were applied to investigate the mechanisms involved.CRLF1 exerted its functions by activating the ERK1/2 signaling pathway.Furthermore,the SMAD-dependent pathway,not the SMAD-independent pathway,was responsible for CRLF1 up-regulation in NMCFs treated with TGF-β1.In summary,activation of the TGF-β1/SMAD signaling pathway in cardiac fibrosis increased CRLF1 expression.CRLF1 then aggravated cardiac fibrosis by activating the ERK1/2 signaling pathway.CRLF1 could become a novel potential target for intervention and remedy of cardiac fibrosis.

LncRNAs are involved in regulating ageing and age-related disease through the adenosine monophosphate-activated protein kinase signalling pathway

A long noncoding RNA(lncRNA)is longer than 200 bp.It regulates various biological processes mainly by interacting with DNA,RNA,or protein in multiple kinds of biological processes.Adenosine monophosphate-activated protein kinase(AMPK)is activated during nutrient starvation,especially glucose starvation and oxygen deficiency(hypoxia),and exposure to toxins that inhibit mitochondrial respiratory chain complex function.AMPK is an energy switch in organisms that controls cell growth and multiple cellular processes,including lipid and glucose metabolism,thereby maintaining intracellular energy homeostasis by activating catabolism and inhibiting anabolism.The AMPK signalling pathway consists of AMPK and its upstream and downstream targets.AMPK upstream targets include proteins such as the transforming growth factor b-activated kinase 1(TAK1),liver kinase B1(LKB1),and calcium/calmodulindependent protein kinase b(CaMKKb),and its downstream targets include proteins such as the mechanistic/mammalian target of rapamycin(mTOR)complex 1(mTORC1),hepatocyte nuclear factor 4a(HNF4a),and silencing information regulatory 1(SIRT1).In general,proteins function relatively independently and cooperate.In this article,a review of the currently known lncRNAs involved in the AMPK signalling pathway is presented and insights into the regulatory mechanisms involved in human ageing and age-related diseases are provided.