Melatonin improves synapse development by PI3K/Akt signaling in a mouse model of autism spectrum disorder

Autism spectrum disorders are a group of neurodevelopmental disorders involving more than 1100 genes,including Ctnnd2 as a candidate gene.Ctnnd2knockout mice,serving as an animal model of autis m,have been demonstrated to exhibit decreased density of dendritic spines.The role of melatonin,as a neuro hormone capable of effectively alleviating social interaction deficits and regulating the development of dendritic spines,in Ctnnd2 deletion-induced nerve injury remains unclea r.In the present study,we discove red that the deletion of exon 2 of the Ctnnd2 gene was linked to social interaction deficits,spine loss,impaired inhibitory neurons,and suppressed phosphatidylinositol-3-kinase(PI3K)/protein kinase B(Akt) signal pathway in the prefrontal cortex.Our findings demonstrated that the long-term oral administration of melatonin for 28 days effectively alleviated the aforementioned abnormalities in Ctnnd2 gene-knockout mice.Furthermore,the administration of melatonin in the prefro ntal cortex was found to improve synaptic function and activate the PI3K/Akt signal pathway in this region.The pharmacological blockade of the PI3K/Akt signal pathway with a PI3K/Akt inhibitor,wo rtmannin,and melatonin receptor antagonists,luzindole and 4-phenyl-2-propionamidotetralin,prevented the melatonin-induced enhancement of GABAergic synaptic function.These findings suggest that melatonin treatment can ameliorate GABAe rgic synaptic function by activating the PI3K/Akt signal pathway,which may contribute to the improvement of dendritic spine abnormalities in autism spectrum disorders.

MicroRNA (let-7b-5p)-targeted DARS2 regulates lung adenocarcinoma growth by PI3K/AKT signaling pathway

Background:The aberrant intraellular expression of a mitochondrial aspartyl tRNA synthetase 2(DARS2)has been reported in human cancers.Nevertheless its critical role and detailed mechanism in lung adenocarcinoma(LUAD)remain unexplored.Methods:Initially,The Cancer Genome Atlas(TCGA)based Gene Expression Profiling Interactive Analysis(GEPIA)database (http:/gepia.cancer-pku.cn/)was used to analyze the prognostic relevance of DARS2 expression in LUAD.Further,cell counting kit(CCK)8,immunostaining,and transwell invasion assays in LUAD cell lines in vitro,as well as DARS2 silence on LUAD by tumorigenicity experiments in wivo in nude mice,were performed.Besides,we analyzed the expression levels of p-PI3K(phosphorylated Phosphotylinosital3 kinase),PI3K,AKT(Protein Kinase B),p-AKT(phosphorylated Protein Kinase B),PCNA(proliferating cell nudear antigen),cleaved-caspase 3,E cadherin,and N-cadherin proteins using the Westem blot analysis.Results:LUAD tissues showed higher DARS2 expression compared to normal tissues.Upregulation of DARS2 could be related to Tumor-Node-Metastasis(TNM)stage,high lymph node metastasis,and inferior prognosis.DARS2 silence decreased the proliferation,migration,and invasion abilities of LUAD cells.In addition,the DARS2 downregulation decreased the PCNA and N-cadherin expression and increased cleaved:caspase 3 and E cadherin expressions in LUAD cells,coupled with the inactivation of the PI3K/AKT signaling pathway.Moreover,DARS2 silence impaired the tumonigenicity of LUAD in vivo.Interestingly,let:7b-5p could recognize DARS2 through a complementary sequence.Mechanistically,the increased let 7b 5p expression attenuated the promo oncogenic action of DARS2 during LUAD progression,which were inversely correlated to each other in the LUAD tssues Conclusion:In summary,let 7b-5p,downregulated DARS2 expression,regulating the progression of LUAD cells by the PI3K/AKT signaling pathway.

Ascophyllum nodosum and Fucus vesiculosus ameliorate restenosis via improving inflammation and regulating the PTEN/PI3K/AKT signaling pathway

Restenosis is a common complication following coronary angioplasty.The traditional use of seaweeds for health benefits has increasingly been explored,however few studies exist reporting its protective effects on the development of restenosis and gut dysbiosis.The aim of this study was to investigate the potential of seaweed extracts(SE) of Ascophyllum nodosum and Fucus vesiculosus in inhibiting intimal hyperplasia in a rat model of restenosis and its underlying mechanisms in macrophages and vascular smooth muscle cells(vSMCs).16S rRNA sequencing was done to investigate the regulatory effect of SE on the gut microbiome of injured rats.As indicated by the results,SE significantly inhibited the progression of intimal hyperplasia in vivo,attenuated inflammation in macrophages and could inhibit the proliferation,dedifferentiation and migration of vSMCs.It was observed through immunoblotting assays that treatment with SE significantly upregulated PTEN expression in macrophages and inhibited the upregulation of PI3K and AKT expression in vSMCs.Meanwhile,according to the 16S rRNA gene sequencing analysis,supplementation with SE modulated gut microbiota composition in injured rats.In conclusion,SE could ameliorate intimal hyperplasia by inhibiting inflammation and vSMCs proliferation through the regulation of the PTEN/PI3K/AKT pathway and modulating the gut microbiome.

Indirubin alleviates retinal neurodegeneration through the regulation of PI3K/AKT signaling

Retinal neurodegenerative disease is a leading cause of blindness among the elderly in developed countries,including glaucoma,diabetic retinopathy,traumatic optic neuropathy and optic neuritis,etc.The current clinical treatment is not very effective.We investigated indirubin,one of the main bioactive components of the traditional Chinese medicine Danggui Longhui Pill,in the present study for its role in retinal neurodegeneration.Indirubin exhibited no detectable tissue toxicity in vivo or cytotoxicity in vitro.Moreover,indirubin improved visual function and ameliorated retinal neurodegeneration in mice after optic nerve crush injury in vivo.Furthermore,indirubin reduced the apoptosis of retinal ganglion cells induced by oxidative stress in vitro.In addition,indirubin significantly suppressed the increased production of intracellular reactive oxygen species and the decreased activity of superoxide dismutase induced by oxidative stress.Mechanically,indirubin played a neuroprotective role by regulating the PI3K/AKT/BAD/BCL-2 signaling.In conclusion,indirubin protected retinal ganglion cells from oxidative damage and alleviated retinal neurodegeneration induced by optic nerve crush injury.The present study provides a potential therapeutic medicine for retinal neurodegenerative diseases.

Mechanism of stilbene glycosides on apoptosis of SH-SY5Y cells via regulating PI3K/AKT signaling pathway

Objective:To investigate the effects of stilbene glycoside(TSG)on okadaic acid-induced apoptosis in human neuroblastoma cells(SH-SY5Y)via the PI3K/AKT pathway.Methods:The optimal concentration of OA was screened by CCK-8 assay,and SH-SY5Y cells were divided into control group,model group,TSG group,LY294002 group and LY294002+TSG group.The proliferation and apoptosis in each group were detected by CCK-8 and TUNEL assays;Western blotting method and real-time fluorescence quantitative polymerase chain reaction was used to detect the expression of PI3K,P-PI3K(Y607),AKT,P-AKT(Ser473),Bcl-2 and Bax proteins.The relative protein expression was represented by P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT and Bcl-2/Bax gray ratio.Results:CCK-8 screened the optimal concentration of OA as 40 nmol/L.Compared with the control group,the model group increased relative cell viability,decreased apoptosis rate,the pathway and apoptotic proteins expression levels of P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT and Bcl-2/Bax were decreased,and the mRNA expression levels of PI3K,AKT and Bcl-2 were decreased.Bax mRNA expression level increased(P<0.05);Compared with model group,TSG group increased relative cell viability,decreased apoptosis rate,increased protein expression levels of P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT,Bcl-2/Bax,and increased mRNA expression levels of PI3K,AKT,and Bcl-2.Bax mRNA expression decreased(P<0.05),LY294002 group decreased relative cell viability,increased apoptosis rate,P-PI3K(Y607)/PI3K protein expression levels were significantly decreased(P<0.05),P-AKT(Ser473)/AKT and Bcl-2/Bax protein expression levels were significantly decreased,but there was no statistical significance,PI3K,AKT and Bcl-2 mRNA expression levels were decreased,and Bax mRNA expression levels were increased(all P<0.05);Compared with LY294002 group,LY294002+TSG group increased relative cell viability,decreased apoptosis rate,and the protein expression levels of P-PI3K(Y607)/PI3K,P-AKT(Ser473)/AKT and Bcl-2/Bax were increased.The mRNA expression levels of PI3K,AKT,Bcl-2 were increased,Bax was decreased(all P<0.05).Conclusion:Stilbene glycoside may alleviate okadaic acid-induced apoptosis in SH-SY5Y cells by interfering with the PI3K/AKT signaling pathway,which in turn regulates the expression of apoptotic factors such as Bcl-2 and Bax.

YBX1 inhibits mitochondrial-mediated apoptosis in ischemic heart through the PI3K/AKT signaling pathway

Background:Myocardial infarction(MI)is associated with higher morbidity and mortality in the world,especially in cold weather.YBX1 is an RNA-binding protein that is required for pathological growth of cardiomyocyte by regulating cell growth and protein synthesis.But YBX1,as an individual RNA-binding protein,regulates cardiomyocytes through signaling cascades during myocardial infarction remain largely unexplored.Methods:In vivo,the mouse MI model was induced by ligating the left anterior descending coronary artery(LAD),and randomly divided into sham operation group,MI group,MI+YBX1 knockdown/overexpression group and MI+negative control(NC)group.The protective effect of YBX1 was verified by echocardiography and triphenyltetrazolium chloride staining.In vitro,mitochondrial-dependent apoptosis was investigated by using CCK8,TUNEL staining,reactive oxygen species(ROS)staining and JC-1 staining in hypoxic neonatal mouse cardiomyocytes(NMCMs).Results:YBX1 expression of cardiomyocytes was downregulated in a mouse model and a cellular model on the ischemic condition.Compared to mice induced by MI,YBX1 overexpression mediated by adeno-associated virus serotype 9(AAV9)vector reduced the infarcted size and improved cardiac function.Knockdown of endogenous YBX1 by shRNA partially aggravated ischemia-induced cardiac dysfunction.In hypoxic cardiomyocytes,YBX1 overexpression decreased lactic dehydrogenase(LDH)release,increased cell viability,and inhibited apoptosis by affecting the expression of apoptosis related proteins,while knockdown of endogenous YBX1 by siRNA had the opposite effect.Overexpression of YBX1 restored mitochondrial dysfunction in hypoxic NMCMs by increasing mitochondrial membrane potential and ATP content and decreasing ROS.In hypoxic NMCMs,YBX1 overexpression increased the expression of phosphorylated phosphatidylinositol 3 kinase(PI3K)/AKT,and the anti-apoptosis effect of YBX1 was eliminated t by LY294002,PI3K/AKT inhibitor.Conclusion:YBX1 protected the heart from ischemic damage by inhibiting the mitochondrial-dependent apoptosis through PI3K/AKT pathway.It is anticipated that YBX1 may serve as a novel therapeutic target for MI.

Acalypha australis L.extract inhibits B16 melanoma cell metastasis through PI3K/AKT signaling pathway

Background:Melanoma is a deadly skin tumor resulting from the malignant transformation of melanocytes.It is highly malignant and invasive,with the highest mortality rate among skin cancers.Acalypha australis L.(AAL),a plant with dual medicinal and culinary purposes,is commonly regarded as an edible wild vegetable in southern China.Additionally,AAL has a long history of medicinal use in China,often employed for its hemostatic,anti-diarrheal,and anti-inflammatory properties.Modern pharmacology has demonstrated that AAL possesses functions such as weight loss,antimicrobial activity,antiviral effects,and treatment for ulcerative colitis.However,there is currently no research available regarding its effectiveness and mechanisms of action on melanoma.Methods:In this investigation,we used methyl thiazolyl tetrazolium assay to detect cell viability,transwell assay to detect cell migration and invasion ability,and Western blot assay to detect relevant signaling pathways.Results:The present study reveals that 2 mg/mL AAL effectively suppresses the metastasis of B16 cells,while simultaneously triggering the expression of key apoptosis-related proteins,including Bcl-2,Bax,and cleaved caspased 3.Subsequent investigations demonstrate that AAL exerts this inhibitory effect via the PI3K/AKT signal transduction pathway,as evidenced by the observed deficits in Ras,AKT,p-AKT,and PI3K expression levels.Conclusion:These findings indicated that AAL could be a valuable therapeutic option for reducing the metastatic potential of B16 melanoma cells.

Zuo Gui Wan Promotes Osteogenesis via PI3K/AKT Signaling Pathway:Network Pharmacology Analysis and Experimental Validation

Objective Osteogenesis is vitally important for bone defect repair,and Zuo Gui Wan(ZGW)is a classic prescription in traditional Chinese medicine(TCM)for strengthening bones.However,the specific mechanism by which ZGW regulates osteogenesis is still unclear.The current study is based on a network pharmacology analysis to explore the potential mechanism of ZGW in promoting osteogenesis.Methods A network pharmacology analysis followed by experimental validation was applied to explore the potential mechanisms of ZGW in promoting the osteogenesis of bone marrow mesenchymal stem cells(BMSCs).Results In total,487 no-repeat targets corresponding to the bioactive components of ZGW were screened,and 175 target genes in the intersection of ZGW and osteogenesis were obtained.And 28 core target genes were then obtained from a PPI network analysis.A GO functional enrichment analysis showed that the relevant biological processes mainly involve the cellular response to chemical stress,metal ions,and lipopolysaccharide.Additionally,KEGG pathway enrichment analysis revealed that multiple signaling pathways,including the phosphatidylinositol-3-kinase/protein kinase B(PI3K/AKT)signaling pathway,were associated with ZGW-promoted osteogensis.Further experimental validation showed that ZGW could increase alkaline phosphatase(ALP)activity as well as the mRNA and protein levels of ALP,osteocalcin(OCN),and runt related transcription factor 2(Runx 2).What’s more,Western blot analysis results showed that ZGW significantly increased the protein levels of p-PI3K and p-AKT,and the increases of these protein levels significantly receded after the addition of the PI3K inhibitor LY294002.Finally,the upregulated osteogenic-related indicators were also suppressed by the addition of LY294002.Conclusion ZGW promotes the osteogenesis of BMSCs via PI3K/AKT signaling pathway.

The effects of hormone-mediated PI3K/AKT signaling on spermatogenesis in Sertoli cells

The phosphoinositide-3-kinase/Akt(PI3K/AKT)signaling pathway is crucial for Sertoli cell development and completing spermatogenesis.Its main role is to promote proliferation and inhibit apoptosis.Many factors activate the PI3K/AKT pathway,like hormones,such as follicle stimulating hormone(FSH),androgen,estrogen,insulin to name a few.Many of these factors have receptors inside or on the surface of Sertoli cells(SCs).This review summarizes how these hormones directly regulate the PI3K/AKT signaling pathway in SCs,which in turn affects SC proliferation and differentiation.Further,hormone-mediated PI3K/AKT signaling also stimulates SC secretion,which is essential for germ cell development,suggesting an indirect role of PI3K/AKT signaling during spermatogenesis.These functions include promoting spermatogonia proliferation and differentiation,meiosis of spermatocytes,sperm maturation,and their release.This review also provides potential hints for clinically treating male infertility issues like cryptorchidism and Sertoli cell-only syndrome.

Simiao Wan alleviates obesity-associated insulin resistance via PKCε/IRS-1/PI3K/Akt signaling pathway based on network pharmacology analysis and experimental validation

Background:The purpose of the study was to investigatethe active ingredients and potential biochemicalmechanisms of Simiao Wan(SMW)in obesity-associated insulin resistance.Methods:An integrated network pharmacology method to screen the active compoundsand candidate targets,construct the protein-protein-interaction network,and ingredients-targets-pathways network was constructed for topological analysis to identify core targets and main ingredients.To find the possible signaling pathways,enrichment analysis was performed.Further,a model of insulin resistance in HL-7702 cells was established to verify the impact of SMW and the regulatory processes.Results:An overall of 63 active components and 151 candidate targets were obtained,in which flavonoids were the main ingredients.Enrichment analysis indicated that the PI3K-Akt signaling pathway was the potential pathway regulated by SMW in obesity-associated insulin resistance treatment.The result showed that SMW could significantly ameliorate insulin sensitivity,increase glucose synthesis and glucose utilization and reduce intracellular lipids accumulation in hepatocytes.Also,SMW inhibited diacylglycerols accumulation-induced PKCεactivity and decreased its translocation to the membrane.Conclusion:SMW ameliorated obesity-associated insulin resistance through PKCε/IRS-1/PI3K/Akt signaling axis in hepatocytes,providing a new strategy for metabolic disease treatment.

XB130 inhibits healing of diabetic skin ulcers through the PI3K/Akt signalling pathway

BACKGROUND Diabetic skin ulcers,a significant global healthcare burden,are mainly caused by the inhibition of cell proliferation and impaired angiogenesis.XB130 is an adaptor protein that regulates cell proliferation and migration.However,the role of XB130 in the development of diabetic skin ulcers remains unclear.AIM To investigate whether XB130 can regulate the inhibition of proliferation and vascular damage induced by high glucose.Additionally,we aim to determine whether XB130 is involved in the healing process of diabetic skin ulcers,along with its molecular mechanisms.METHODS We conducted RNA-sequencing analysis to identify the key genes involved in diabetic skin ulcers.We investigated the effects of XB130 on wound healing using histological analyses.In addition,we used reverse transcription-quantitative polymerase chain reaction,Western blot,terminal deoxynucleotidyl transferasemediated dUTP nick end labeling staining,immunofluorescence,wound healing,and tubule formation experiments to investigate their effects on cellular processes in human umbilical vein endothelial cells(HUVECs)stimulated with high glucose.Finally,we performed functional analysis to elucidate the molecular mechanisms underlying diabetic skin ulcers.RESULTS RNA-sequencing analysis showed that the expression of XB130 was up-regulated in the tissues of diabetic skin ulcers.Knockdown of XB130 promoted the healing of skin wounds in mice,leading to an accelerated wound healing process and shortened wound healing time.At the cellular level,knockdown of XB130 alleviated high glucose-induced inhibition of cell proliferation and angiogenic impairment in HUVECs.Inhibition of the PI3K/Akt pathway removed the proliferative effects and endothelial protection mediated by XB130.CONCLUSION The findings of this study indicated that the expression of XB130 is up-regulated in high glucose-stimulated diabetic skin ulcers and HUVECs.Knockdown of XB130 promotes cell proliferation and angiogenesis via the PI3K/Akt signalling pathway,which accelerates the healing of diabetic skin ulcers.

The role and research progress of PI3K/AKT signaling pathway in non-traumatic osteonecrosis of the femoral head

Non-traumatic osteonecrosis of the femoral head(NONFH)is one of the most common orthopedic diseases,influenced by multiple signaling pathways and inflammatory factors.The PI3K/AKT signaling pathway is closely related to various biological processes such as apoptosis,autophagy,and metabolism in cells.Increasing evidence suggests that it plays an important role in the development of femoral head necrosis.This paper aims to explore the mechanism of the PI3K/AKT signaling pathway in the pathogenesis of NONFH by analyzing its regulation of lipid metabolism,cell apoptosis and autophagy,and intravascular coagulation.This study provides new insights for the research of NONFH.

FGF2 promotes the chemotherapy resistance in colon cancer cells through activating PI3K/Akt signaling pathway

Background:To investigate the role of fibroblast growth factor 2(FGF2)in chemotherapy resistance of colon cancer.Methods:An HCT116/5-fluorouracil(5-FU)-resistant cell line was established,and FGF2 levels were detected in a sensitive cell group(HCT116)and a resistant cell group(HCT1116-R)using different methods.Fibroblast growth factor 2 levels in the medium were determined by enzyme-linked immunoassay.The protein expressions of FGF2,fibroblast growth factor receptor 1(FGFR1),and phospho-FGFR1 were assessed by Western blotting,and FGF2 mRNA levels were detected by quantitative real-time polymerase chain reaction.Fibroblast growth factor 2 recombinant protein was added to sensitive cells,and FGFR inhibitor AZD4547 was added to resistant cells,and the cell survival rate was determined using the cell counting kit-8 method and the protein expressions of PI3K(phosphatidylinositol 3 kinase),p-PI3K(phospho-PI3K),Akt(protein kinase B),p-Akt(phospho-Akt),mammalian target of rapamycin(mTOR),p-mTOR(phospho-mTOR),Bad(Bcl-xL/Bcl-2-associated death promoter),NF-κB(nuclear factorκB),GSK-3(glycogen synthase kinase-3),FKHR(forkhead box protein O1),and PTEN(phosphatase and tensin homolog deleted on chromosome ten)were detected by Western blotting.Results:Fibroblast growth factor 2 protein and mRNA expression levels in the HCT116-R group were significantly higher than those in the HCT116 group.Fibroblast growth factor 2 increased the survival rate of HCT116 cells;improved tolerance to 5-FU;upregulated p-PI3K,p-Akt,and p-mTOR;and downregulated Bad.The FGFR inhibitor AZD4547 decreased cell survival rate and tolerance to 5-FU;downregulated p-PI3K,p-Akt,and p-mTOR expression;and upregulated Bad.Conclusions:Fibroblast growth factor 2 promotes chemotherapy tolerance in colon cancer cells by activating the Akt/mTOR and Akt/Bad signaling pathways downstream of PI3K.

POLE2 Regulates Apoptosis of Oral Squamous Cell Carcinoma Cells through the PI3K/AKT Signaling Pathway

Objective Oral squamous cell carcinoma(OSCC)is the most common malignant tumor of the head and neck,but its occurrence and progression mechanisms remain unclear.In addition-there is a lack of effective targeting drugs.The second major subunit of DNA polymerase(POLE2)catalyzes the prolongation of new strand replication and modifies exonuclease domain activity.Our previous study found that POLE2 was associated with OSCC progression,but the mechanism remains unclear.Methods The expression of POLE2 in OSCC tissues was detected using immunological assays.Mann-Whitney U analysis was used to investigate the relationship between POLE2 gene expression and tumor classification and prognosis of OSCC.POLE2 expression was inhibited in OSCC cells,and the effects of gene and protein expression were detected using RT-PCR and Western blotting.The POLE2 knockout model was constructed by transfecting a lentiviral vector.Cell proliferation,apoptosis,and migration were detected using various assays including colony formation,MTT,flow cytometry,wound healing assay,Transwell assay,and the Human Apoptosis Antibody Array.The animal model of OSCC was established by subcutaneous injection of transfected HN6 into 4-week-old female nude mice.After 30 days,tumors were removed under anesthesia and tumor weight and dimension were recorded.Tumor cell proliferation was analyzed using Ki67 staining.Results POLE2 gene levels were significantly higher in the OSCC tissues than in the normal tissues.In addition,POLE2 gene levels were statistically correlated with tumor classification and prognosis.Silencing POLE2 inhibited the proliferation of oral cancer cells and promoted apoptosis in vitro.Animal experiments also supported a positive correlation between POLE2 and OSCC tumor formation.We further demonstrated that POLE2 could upregulate the expression of apoptosis-related proteins such as caspase-3,CD40,CD40L,DR6,Fas,IGFBP-6,p21,and SMAC.In addition,POLE2 regulated OSCC development by inhibiting the PI3K/AKT signaling pathway.Conclusion POLE2 is closely related to the progression of OSCC.Thus,POLE2 may be a potential target for OSCC treatment.

The Effect of MMP-9 Inhibitors on the Biological Behavior of Human Oral Squamous Cell Carcinoma SCC15 Cell Line Through PI3K/Akt Signaling Pathway

Objective:To investigate the effect of MMP-9 inhibitor(Mki67)on the biology of human oral squamous cell carcinoma SCC15 cell line and to explore its mechanism of action through PI3K/Akt signaling pathway.Methods:SCC15 cells were extracted,and the supernatant was discarded.The cells were then rinsed twice with PBS,and 0,2.5,5,and 10μL of Mki67(50 mg/mL)were added to the culture respectively.The inhibition rate of cell proliferation was detected by 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide(MTT)method,and the cell migration was measured by Transwell chamber test.The cell apoptosis rate was detected by cytometry,and the p-Akt protein content in the cells of each group was determined by a double-antibody sandwich enzyme-linked immunosorbent assay(ELISA)kit.Results:The cell proliferation rates of the 2.5μL,5μL,and 10μL dose groups were all lower than the 0μL group(P<0.05)before treatment,and the cell proliferation rates in the 2.5μL,5μL,and 10μL dose groups decreased overtime(P<0.05).After 24 h,with the increase of Mki67 concentration,the number of migration and invasion gradually decreased(P<0.05),and the number of apoptosis gradually increased(P<0.05);besides,the relative expression of MMP-9,PI3K,and Akt mRNA decreased gradually(P<0.05),and the expression level of Akt mRNA was not statistically significant(P>0.05).Conclusion:MMP-9 inhibitor(Mki67)can inhibit the proliferation and migration of SCC15 cell line and induce apoptosis,and its mechanism of action may be related to the inhibition of PI3K/Akt signaling pathway.

Baicalin attenuates blood-spinal cord barrier disruption and apoptosis through PI3K/Akt signaling pathway after spinal cord injury

Baicalin is a natural active ingredient isolated from Scutellariae Radix that can cross the blood-brain barrier and exhibits neuroprotective effects on multiple central nervous system diseases.However,the mechanism behind the neuroprotective effects remains unclear.In this study,rat models of spinal cord injury were established using a modified Allen's impact method and then treated with intraperitoneal injection of Baicalin.The results revealed that Baicalin greatly increased the Basso,Beattie,Bresnahan Locomotor Rating Scale score,reduced blood-spinal cord barrier permeability,decreased the expression of Bax,Caspase-3,and nuclear factorκB,increased the expression of Bcl-2,and reduced neuronal apoptosis and pathological spinal cord injury.SH-SY5 Y cell models of excitotoxicity were established by application of 10 m M glutamate for 12 hours and then treated with 40μM Baicalin for 48 hours to investigate the mechanism of action of Baicalin.The results showed that Baicalin reversed tight junction protein expression tendencies(occludin and ZO-1)and apoptosis-related protein expression(Bax,Bcl-2,Caspase-3,and nuclear factor-κB),and also led to up-regulation of PI3 K and Akt phosphorylation.These effects on Bax,Bcl-2,and Caspase-3 were blocked by pretreatment with the PI3 K inhibitor LY294002.These findings suggest that Baicalin can inhibit bloodspinal cord barrier permeability after spinal cord injury and reduce neuronal apoptosis,possibly by activating the PI3 K/Akt signaling pathway.This study was approved by Animal Ethics Committee of Xi'an Jiaotong University on March 6,2014.

Jiao-tai-wan Up-regulates Hypothalamic and Peripheral Circadian Clock Gene Cryptochrome and Activates PI3K/AKT Signaling in Partially Sleep-deprived Rats

This study aims to explore the effect and mechanism of Jiao-tai-wan （JTW） on systemic and tissue-specific inflammation and insulin resistance in obesity-resistant （OR） rats with chronic partial sleep deprivation （PSD）. OR rats with PSD were orally given JTW and Estazolam for 4 weeks. The amount of food intake and metabolic parameters such as body weight increase rate, fasting plasma glucose （FPG）, fasting insulin （FINS）, homeostasis model assessment-insulin resistance （HOMA-IR） and plasma inflammatory markers were measured. The expression levels of circadian proteins cryptochrome 1 （Cryl） and cryptochrome 2 （Cry2） in hypothalamus, adipose and liver tissues were also determined. Meanwhile, the mRNA expression of inflammatory markers, activity of nuclear factor kappa B （NF-κB） p65 protein, as well as the expression levels of insulin signaling pathway proteins in hypothalamus, adipose and liver tissues were measured. Additionally, cyclic adenosine 3＇, 5＇-monophosphate （cAMP） and activity of vasodilator-stimulated phosphoprotein （VASP） in hypothalamus tissue were measured. JTW significantly decreased the body weight increase rate and food intake, ameliorated systemic inflammation and insulin resistance. JTW effectively ameliorated inflammation and increased PI3K/AKT signaling activation in hypothalamus, adipose and liver. Interestingly, all these changes were associated with the up-regulation of circadian gene Cryl and Cry2 protein expression. We also found that in hypothalamus tissue of PSD rats, down-regulation of Cryl and Cry2 activated cAMP/PKA signaling and then led to inflammation, while JTW inhibited this signaling. These results suggested that JTW has the beneficial effect on ameliorating inflammation and insulin resistance in partially sleep-deprived rats by up-regulating Cry expression.

Panax notogiseng saponin inhibits ischemia-induced apoptosis by activating PI3K/Akt signal pathway in cardiomyocytes

The panax notoginseng saponin(PNS) had been clinically used for the treatment of cardiovascular diseases and stroke in China.It had been demonstrated that PNS could protect cardiomyocytes from injury induced by ischemi- a,but the underlying molecular mechanisms of this protective effect were still unclear.This study was aimed to investigate the protective effect and molecular mechanisms of PNS on apoptosis in H9c2 cells in vitro and rat myocardial ischemia injury model in vivo.Annexin-V/PI assay shew that PNS could protect H9c2 cells from apoptosis induced by serum, glucose and oxygen deprivation(SGOD) in a dose-dependent manner.However,the anti-apoptotic effect of PNS was reversed by LY294002,a specific PI3K inhibitor.This antiapoptotic effect of PNS was confirmed by JC-1,a specific probe of mitochondrial membrane potential staining.PNS could significantly increase phos-Akt in H9c2 cells by Western blot assays and its effect could be inhibited by LY294002.Furthermore,PNS could improve ischemic-induced left ventricular function as reflected by EF,LVDd and LVDs.PNS could also inhibited cellular apoptosis in myocardial tissues in ischemic rats by TUNEL assay.PNS administration also increased the expression of phos-Akt in rat ischemic myocardial tissues.These results suggested that PNS could protect myocardial cells from apoptosis induced by ischemia in vitro model and in vivo model through activating-PI3K/Akt signal pathway which may be meaningful for further understanding the molecular mechanisms of cardiac protection of PNS.And the results might be useful in treatment of myocardial ischemia in future.

Scoparone inhibits pancreatic cancer through PI3K/Akt signaling pathway

BACKGROUND Pancreatic cancer is a highly malignant tumor of the gastrointestinal system whose emerging resistance to chemotherapy has necessitated the development of novel antitumor treatments.Scoparone,a traditional Chinese medicine monomer with a wide range of pharmacological properties,has attracted considerable attention for its antitumor activity.AIM To explore the potential antitumor effect of scoparone on pancreatic cancer and the possible molecular mechanism of action.METHODS The target genes of scoparone were determined using both the bioinformatics and multiplatform analyses.The effect of scoparone on pancreatic cancer cell proliferation,migration,invasion,cell cycle,and apoptosis was detected in vitro.The expression of hub genes was tested using quantitative reverse transcription polymerase chain reaction(qRT-PCR),and the molecular mechanism was analyzed using Western blot.The in vivo effect of scoparone on pancreatic cancer cell proliferation was detected using a xenograft tumor model in nude mice as well as immunohistochemistry.RESULTS The hub genes involved in the suppression of pancreatic cancer by scoparone were obtained by network bioinformatics analyses using publicly available databases and platforms,including SwissTargetPrediction,STITCH,GeneCards,CTD,STRING,WebGestalt,Cytoscape,and Gepia;AKT1 was confirmed using qRT-PCR to be the hub gene.Cell Counting Kit-8 assay revealed that the viability of Capan-2 and SW1990 cells was significantly reduced by scoparone treatment exhibiting IC50 values of 225.2μmol/L and 209.1μmol/L,respectively.Wound healing and transwell assays showed that scoparone inhibited the migration and invasion of pancreatic cancer cells.Additionally,flow cytometry confirmed that scoparone caused cell cycle arrest and induced apoptosis.Scoparone also increased the expression levels of Bax and cleaved caspase-3,decreased the levels of MMP9 and Bcl-2,and suppressed the phosphorylation of Akt without affecting total PI3K and Akt.Moreover,compared with the control group,xenograft tumors,in the 200μmol/L scoparone treatment group,were smaller in volume and lighter in weight,and the percentages of Ki65-and PCNA-positive cells were decreased.CONCLUSION Our findings indicate that scoparone inhibits pancreatic cancer cell proliferation in vitro and in vivo,inhibits migration and invasion,and induces cycle arrest and apoptosis in vitro through the PI3K/Akt signaling pathway.

Sulforaphane modulates TGFβ2-induced conjunctival fibroblasts activation and fibrosis by inhibiting PI3K/Akt signaling

AIM:To examine the effects of sulforaphane on fibrotic changes of transforming growth factor(TGFβ2)induced human conjunctival fibroblast(HCon Fs).METHODS:HCon Fs were cultured and divided into control,TGFβ2(1 ng/m L),sulforaphane and TGFβ2+sulforaphane groups.Cell viability and apoptosis were detected using the MTT and Apo Tox-Glo Triplex assay.Cell migration was detected using scratch and Transwell assay.Real-time quantitative PCR method was used to evaluate m RNA expression of TGFβ2,matrix metalloproteinase-2(MMP2),myosin light chain kinase(MYLK),integrinαV,integrinα5,fibronectin 1 andα-smooth muscle actin(α-SMA).The protein expression ofα-SMA,p-PI3 K,PI3 K,p-Akt,and Akt were detected by Western blot.RESULTS:The proliferation of HCon Fs was significantly(P<0.05)suppressed by sulforaphane compared to control cells with the increase of the concentration and treatment time.Cell proliferation after 48 h incubation was significantly reduced with 100μmol/L sulforaphane treatment by 17.53%(P<0.05).The Transwell assay showed sulforaphane decreased cell migration by 18.73%compared with TGFβ2-induced HCon F(P<0.05).TGFβ2-induced the increasing expression of fibronectin,type I collagen andα-SMA,and the phosphorylation of PI3 K and Akt were all significantly suppressed by sulforaphane pretreatment.CONCLUSION:Sulforaphane inhibits proliferation,migration,and synthesis of the extracellular matrix in HCon Fs,and inhibiting the PI3 K/Akt signaling pathway.Sulforaphane could be a potential therapeutic drug for prevention of scar formation in filtering bleb after trabeculectomy.