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.

Hypoglycemic mechanism of Tegillarca granosa polysaccharides on type 2 diabetic mice by altering gut microbiota and regulating the PI3K-akt signaling pathwaye

Type 2 diabetes mellitus(T2DM)is a complex metabolic disease threatening human health.We investigated the effects of Tegillarca granosa polysaccharide(TGP)and determined its potential mechanisms in a mouse model of T2DM established through a high-fat diet and streptozotocin.TGP(5.1×10^(3) Da)was composed of mannose,glucosamine,rhamnose,glucuronic acid,galactosamine,glucose,galactose,xylose,and fucose.It could significantly alleviate weight loss,reduce fasting blood glucose levels,reverse dyslipidemia,reduce liver damage from oxidative stress,and improve insulin sensitivity.RT-PCR and Western blotting indicated that TGP could activate the phosphatidylinositol-3-kinase/protein kinase B signaling pathway to regulate disorders in glucolipid metabolism and improve insulin resistance.TGP increased the abundance of Allobaculum,Akkermansia,and Bifidobacterium,restored the microbiota abundance in the intestinal tracts of mice with T2DM,and promoted short-chain fatty acid production.This study provides new insights into the antidiabetic effects of TGP and highlights its potential as a natural hypoglycemic nutraceutical.

Spi1 regulates the microglial/macrophage inflammatory response via the PI3K/AKT/mTOR signaling pathway after intracerebral hemorrhage

Preclinical and clinical studies have shown that microglia and macrophages participate in a multiphasic brain damage repair process following intracerebral hemorrhage.The E26 transformation-specific sequence-related transcription factor Spi1 regulates microglial/macrophage commitment and maturation.However,the effect of Spi1 on intracerebral hemorrhage remains unclear.In this study,we found that Spi1 may regulate recovery from the neuroinflammation and neurofunctional damage caused by intracerebral hemorrhage by modulating the microglial/macrophage transcriptome.We showed that high Spi1expression in microglia/macrophages after intracerebral hemorrhage is associated with the activation of many pathways that promote phagocytosis,glycolysis,and autophagy,as well as debris clearance and sustained remyelination.Notably,microglia with higher levels of Soil expression were chara cterized by activation of pathways associated with a variety of hemorrhage-related cellular processes,such as complement activation,angiogenesis,and coagulation.In conclusion,our results suggest that Spi1 plays a vital role in the microglial/macrophage inflammatory response following intracerebral hemorrhage.This new insight into the regulation of Spi1 and its target genes may advance our understanding of neuroinflammation in intracerebral hemorrhage and provide therapeutic targets for patients with intracerebral hemorrhage.

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.

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.

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.

Downregulation of Serum PTEN Expression in Mercury-Exposed Population and PI3K/AKT Pathway-Induced Inflammation

Objective This study investigated the impact of occupational mercury(Hg) exposure on human gene transcription and expression, and its potential biological mechanisms.Methods Differentially expressed genes related to Hg exposure were identified and validated using gene expression microarray analysis and extended validation. Hg-exposed cell models and PTEN lowexpression models were established in vitro using 293T cells. PTEN gene expression was assessed using qRT-PCR, and Western blotting was used to measure PTEN, AKT, and PI3K protein levels. IL-6 expression was determined by ELISA.Results Combined findings from gene expression microarray analysis, bioinformatics, and population expansion validation indicated significant downregulation of the PTEN gene in the high-concentration Hg exposure group. In the Hg-exposed cell model(25 and 10 μmol/L), a significant decrease in PTEN expression was observed, accompanied by a significant increase in PI3K, AKT, and IL-6 expression.Similarly, a low-expression cell model demonstrated that PTEN gene knockdown led to a significant decrease in PTEN protein expression and a substantial increase in PI3K, AKT, and IL-6 levels.Conclusion This is the first study to report that Hg exposure downregulates the PTEN gene, activates the PI3K/AKT regulatory pathway, and increases the expression of inflammatory factors, ultimately resulting in kidney inflammation.

ROR2 promotes invasion and chemoresistance of triple-negative breast cancer cells by activating PI3K/AKT/mTOR signaling

Objective:This study aimed to investigate the role of receptor tyrosine kinase-like orphan receptor 2(ROR2)in triple-negative breast cancer(TNBC).Methods:ROR2 expression in primary TNBC and metastatic TNBC tissues was analyzed by immunohistochemical staining and PCR.ROR2 expression in TNBC cell lines was detected by PCR and Western blot analysis.The migration,invasion and chemosensitivity of TNBC cells with overexpression or knockdown of ROR2 were examined.Results:ROR2 expression was high in metastatic TNBC tissues.ROR2 knockdown suppressed the migration,invasion and chemoresistance of TNBC cells.ROR2 overexpression in MDA-MB-435 cells promoted the migration,invasion,and chemoresistance.Moreover,ROR2 knockdown in HC1599 and MDA-MB-435 adriamycin-resistant cells enhanced chemosensitivity to adriamycin.ROR2 could activate PI3K/AKT/mTOR signaling in TNBC cells.Conclusion:ROR2 is upregulated and promotes metastatic phenotypes of TNBC by activating PI3K/AKT/mTOR signaling.

基于PTEN/PI3K/Akt信号通路探讨糖通饮对糖尿病肾病大鼠足细胞损伤的保护作用

目的探讨糖通饮对糖尿病肾病(DN)大鼠足细胞损伤的保护作用。方法高脂高糖饮食联合链脲佐菌素(STZ)多次注射建立DN大鼠模型,并随机分为模型组、厄贝沙坦组(13.5mg/kg)和糖通饮低、中、高剂量组(930、1860、3720mg/kg),另设置正常组,各组灌胃给予相应剂量药物,每天1次,连续8周。检测各组大鼠空腹血糖(FBG)、24h尿蛋白(24-hUP)、血肌酐(Scr)、血尿素氮(BUN)水平,HE染色观察各组大鼠肾组织病理形态学改变,透射电子显微镜观察肾足细胞超微结构变化,RT-qPCR法检测肾组织PTEN、PI3K、Akt、nephrin、podocin、CD2APmRNA表达,Westernblot法检测肾组织PTEN、PI3K、Akt、p-Akt、nephrin、podocin、CD2AP蛋白表达。结果与模型组比较,糖通饮各剂量组FBG、24-hUP、Scr、BUN水平降低(P<0.05,P<0.01),肾组织病理形态和足细胞超微结构得到改善,PTEN、nephrin、podocin、CD2APmRNA和蛋白表达升高(P<0.05,P<0.01),p-Akt蛋白表达降低(P<0.05,P<0.01);糖通饮中、高剂量组PI3K、AktmRNA和蛋白表达降低(P<0.05,P<0.01)。结论糖通饮对DN大鼠肾组织足细胞有保护作用,其机制可能与调节PTEN/PI3K/Akt信号通路有关。

基于PTEN与JAK对PI3K/Akt信号通路的影响探讨加味小蓟饮子治疗急性放射性膀胱炎的作用机制

目的:探讨加味小蓟饮子治疗急性放射性膀胱炎的作用机制。方法:50只ICR小鼠随机分为空白组12只和造模组38只。采用X射线辐照仪造模,造模后随机取2只小鼠处死鉴定模型是否成功。将剩余造模组小鼠随机分为模型组、小蓟饮子组和加味小蓟饮子组各12只。空白组、模型组、小蓟饮子组、加味小蓟饮子组分别予0.9%氯化钠、0.9%氯化钠、小蓟饮子药液,加味小蓟饮子药液灌胃处理,每日1次,连续7 d。末次灌胃后24 h处死取材,酶联免疫吸附实验(ELISA)法检测血清超氧化物歧化酶(SOD)、丙二醛(MDA)、谷胱甘肽过氧化物酶(GSH-Px)、总抗氧化能力(T-AOC)含量。Western Blot法检测小鼠膀胱丝氨酸/苏氨酸激酶(AKT)、E钙粘着蛋白(E-Cadherin)、内皮素-1(ET-1)、JAK激酶(JAK)、核转录因子红系2相关因子2(Nrf2)、磷脂酰肌醇3-激酶(PI3K)、人第10号染色体缺失的磷酸酶(PTEN)、Smad蛋白2(Smad2)、Smad蛋白3(Smad3)、转化生长因子β1(TGF-β1)、尿斑蛋白3(Upk3)、血管内皮生长因子(VEGF)蛋白相对表达水平;实时荧光免疫定量-聚合酶链式反应法(RT-PCR)法检测小鼠膀胱微RNA-21(MicroRNA-21,miR-21)、PTEN、JAK、PI3K、AKT、Nrf2信使核糖核酸(mRNA)相对表达水平。结果:相较模型组,加味小蓟饮子组小鼠体内SOD、GSH-Px、T-AOC、AKT、E-Cadherin、JAK、Nrf2、PI3K、Upk3含量升高(P<0.05),MDA、ET-1、PTEN、Smad2、Smad3、TGF-β1、VEGF含量下降(P<0.05);与模型组和小蓟饮子组比较,加味小蓟饮子miR-21 mRNA表达升高(P<0.05)。结论:加味小蓟饮子组可能通过上调miR-21表达,同调PTEN、JAK蛋白以激活下游PI3K/AKT/Nrf2信号通路治疗急性放射性膀胱炎。

血必净注射液通过PTEN/PI3K/Akt/mTOR信号通路对大鼠肺缺血再灌注损伤的影响

目的:探讨血必净注射液对肺缺血再灌注损伤的保护作用及其相关机制。方法:选择18只健康成年雄性大鼠,随机分为正常对照组(Sham组)、肺缺血再灌注组(LIR组)、血必净注射液组(XBJ组),采用开胸夹闭左肺门构建肺缺血再灌注损伤大鼠模型,苏木素—伊红染色观察各组大鼠肺组织病理学改变,检测各组大鼠肺组织湿/干重比(W/D)及肺组织炎症因子IL-1β、TNF-α水平,Western Blot检测各组肺组织PTEN、PI3K、Akt、mTOR、LC3-Ⅰ、LC3-Ⅱ、p62蛋白表达,qRT-PCR检测各组肺组织PTEN、PI3K、Akt、mTOR mRNA表达。结果:血必净注射液可显著减轻肺缺血再灌注大鼠肺组织损伤,降低缺血再灌注大鼠肺组织W/D及IL-1β、TNF-α含量(P<0.05)。与Sham组相比,LIR组、XBJ组PTEN、PI3K、Akt、mTOR、LC3-Ⅰ、LC3-Ⅱ、p62表达均升高(P<0.05);与LIR组相比,XBJ组PTEN、LC3-Ⅰ、LC3-Ⅱ、p62表达降低(P<0.05),PI3K、Akt、mTOR表达升高(P<0.05)。与Sham组相比,LIR组、XBJ组PTEN、PI3K、Akt、mTOR mRNA表达升高(P<0.05);与LIR组相比,XBJ组PTEN mRNA表达降低(P<0.05),PI3K、Akt、mTOR mRNA表达升高(P<0.05)。结论:血必净注射液可能通过抑制PTEN,激活PI3K/Akt/mTOR信号通路抑制肺缺血再灌注损伤自噬水平,从而改善肺缺血再灌注损伤,达到保护肺组织的作用。

Myricetin induces M2 macrophage polarization to alleviate renal tubulointerstitial fibrosis in diabetic nephropathy via PI3K/Akt pathway

BACKGROUND Development of end-stage renal disease is predominantly attributed to diabetic nephropathy(DN).Previous studies have indicated that myricetin possesses the potential to mitigate the pathological alterations observed in renal tissue.Never-theless,the precise molecular mechanism through which myricetin influences the progression of DN remains uncertain.AIM To investigate the effects of myricetin on DN and explore its potential therapeutic mechanism.METHODS Db/db mice were administered myricetin intragastrically on a daily basis at doses of 50 mg/kg or 100 mg/kg for a duration of 12 wk.Subsequently,blood and urine indexes were assessed,along with examination of renal tissue pathology.Kidney morphology and fibrosis were evaluated using various staining techniques including hematoxylin and eosin,periodic acid–Schiff,Masson’s trichrome,and Sirius-red.Additionally,high-glucose culturing was conducted on the RAW 264.7 cell line,treated with 25 mM myricetin or co-administered with the PI3K/Akt inhibitor LY294002 for a period of 24 h.In both in vivo and in vitro settings,quantification of inflammation factor levels was conducted using western blotting,real-time qPCR and ELISA.RESULTS In db/db mice,administration of myricetin led to a mitigating effect on DN-induced renal dysfunction and fibrosis.Notably,we observed a significant reduction in expressions of the kidney injury markers kidney injury molecule-1 and neutrophil gelatinase associated lipocalin,along with a decrease in expressions of inflammatory cytokine-related factors.Furthermore,myricetin treatment effectively inhibited the up-regulation of tumor necrosis factor-alpha,interleukin-6,and interluekin-1βinduced by high glucose in RAW 264.7 cells.Additionally,myricetin modulated the M1-type polarization of the RAW 264.7 cells.Molecular docking and bioinformatic analyses revealed Akt as the target of myricetin.The protective effect of myricetin was nullified upon blocking the polarization of RAW 264.7 via inhibition of PI3K/Akt activation using LY294002.CONCLUSION This study demonstrated that myricetin effectively mitigates kidney injury in DN mice through the regulation of macrophage polarization via the PI3K/Akt signaling pathway.

黄芩清热除痹胶囊通过PTEN/PI3K/AKT信号通路改善痛风性关节炎大鼠的炎症反应及尿酸、脂质代谢失衡

目的探究黄芩清热除痹胶囊(HQC)对痛风性关节炎(GA)大鼠炎症反应及尿酸、脂质代谢的影响,并探讨其可能机制。方法随机将60只SD大鼠分为6组:正常组,模型组,HQC低、中、高剂量组,秋水仙碱组(n=10);以单钠尿酸盐注射右踝关节腔进行GA大鼠造模,HQC低、中、高剂量组及秋水仙碱组予相应剂量药物灌胃,模型组予等量生理盐水,连续7 d。造模后4、8、24、48、72 h检测各组大鼠足趾肿胀度;HE染色法进行滑膜组织学分析;ELISA检测血清中白细胞介素(IL)-10、IL-18、肿瘤坏死因子(TNF)-α、转化生长因子(TGF)-β1、脂联素(APN)、瘦素(LP)、抵抗素(RS)、内脂素(VF)的表达,检测滑膜中APN、LP、RS、VF的表达;生化法检测血清中高密度脂蛋白胆固醇(HDL-C)、甘油三酯(TG)、总胆固醇(TC)、血尿酸(BUA)的水平;RT-qPCR检测滑膜中磷酸酶与紧张素同源物(PTEN)、磷脂酰肌醇-3-激酶(PI3K)、蛋白激酶B(AKT)mRNA的表达;Western blotting检测PTEN、PI3K、p-PI3K、AKT、p-AKT蛋白表达。结果与正常组比较,模型组足趾肿胀度升高(P<0.05),且在48 h达到高峰;HE染色显示大量炎性细胞浸润和滑膜组织增生;TNF-α、TGF-β1、IL-18、TC、TG、LP、RS、VF、BUA、p-PI3K、p-AKT的表达增加(P<0.05),IL-10、APN、HDL-C、PTEN的表达降低(P<0.05)。与模型组比较,HQC和秋水仙碱可降低TNF-α、TGF-β1、IL-18、TC、TG、LP、RS、VF、BUA、p-PI3K、p-AKT的表达(P<0.05),升高IL-10、APN、HDL-C、PTEN的表达(P<0.05),减轻滑膜组织病理损伤,改善足趾肿胀度。结论HQC可改善GA大鼠炎症反应及尿酸、脂质代谢失衡,可能与抑制PTEN/PI3K/AKT信号通路有关。

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.

miR-26a-5p调控PTEN/PI3K/Akt信号通路对高糖诱导视网膜Müller细胞活化及凋亡的影响

目的检测微小RNA-26a-5p(microRNA-26a-5p,miR-26a-5p)对PTEN/PI3K/Akt信号通路及高糖刺激的视网膜Müller细胞凋亡的影响,探讨糖尿病视网膜神经损伤的潜在机制。方法采用不同浓度的葡萄糖刺激视网膜Müller细胞构建糖尿病视网膜神经损伤模型,采用CCK-8及流式细胞仪观察细胞增殖及凋亡情况,细胞转染过表达miR-26a-5p模拟物,Real-time PCR检测miR-26a-5p、PTEN、PI3K、Akt的表达情况,ELISA测定细胞上清液中IL-1β及IL-6的水平,采用Graphpad 8.0软件处理数据。结果高糖刺激视网膜Müller细胞生长活跃,与对照组相比,50 mmol/L高糖刺激Müller细胞活力在12 h、24 h时逐渐增加,48 h时活力减弱,细胞凋亡增加,组间差异有统计学意义(P<0.05)。高糖刺激后视网膜Müller细胞中miR-26a-5p水平下降,PTEN的表达显著升高,PI3K及Akt水平下降,IL-1β及IL-6的水平明显升高,过表达miR-26a-5p后,PTEN水平降低,PI3K/Akt及炎性因子降低,细胞凋亡减少(P<0.01)。结论miR-26a-5p通过调控PTEN/PI3K/Akt的表达,影响炎症因子释放,减轻高糖诱导的视网膜Müller细胞凋亡。

阿魏酸通过调节PTEN/PI3K/AKT信号通路抑制急性T淋巴细胞白血病进展

目的探究阿魏酸是否可通过调控PTEN/PI3K/AKT信号通路在体内外抑制急性T淋巴细胞白血病进展。方法将急性T淋巴细胞白血病Jurkat细胞分为对照组、阿魏酸处理组和LY294002处理组进行体外实验,对照组正常培养;阿魏酸处理组分别给予不同浓度(1.25、2.5、5、10、20、40、80、160µmol/L)阿魏酸,采用CCK-8法检测细胞增殖能力,筛选实验浓度;LY294002处理组给予50µmol/L PI3K/AKT抑制剂LY294002,采用克隆形成实验、流式细胞术、Transwell实验检测细胞增殖、凋亡、侵袭情况,采用Western blot检测核蛋白Ki67、增殖细胞核抗原(PCNA)、cleaved caspase-3、cleaved caspase-9、E-cadherin、N-cadherin、Vimentin、PTEN、p-PI3K、PI3K、p-AKT和AKT蛋白相对表达量。使用30只雄性BALB/c裸鼠建立移植瘤裸鼠模型,平均分为正常组和阿魏酸处理组进行体内实验,正常组接种Jurkat细胞后以生理盐水灌胃,阿魏酸处理组接种Jurkat细胞后以75 mg/kg阿魏酸灌胃,比较移植瘤质量和体积变化,并检测肿瘤组织中Ki67、cleaved caspase-3/caspase-3、E-cadherin、N-cadherin、PTEN、p-PI3K、PI3K、p-AKT和AKT水平。结果体外实验中,与对照组比较,5、10、20µmol/L阿魏酸处理组和LY294002处理组细胞克隆形成率、细胞侵袭数、Ki67、PCNA、N-cadherin、Vimentin、p-PI3K/PI3K、p-AKT/AKT明显降低/减少(P<0.05),细胞凋亡率、cleaved caspase-3/caspase-3、cleaved caspase-9/caspase-9、E-cadherin、PTEN明显升高(P<0.05)。体内实验中,与正常组比较,阿魏酸处理组裸鼠肿瘤质量减轻,肿瘤体积减小,肿瘤组织中Ki67、N-cadherin、p-PI3K/PI3K、p-AKT/AKT明显降低,cleaved caspase-3/caspase-3、E-cadherin、PTEN明显升高,差异均有统计学意义(P<0.05)。结论阿魏酸在体内外均可抑制急性T淋巴细胞白血病Jurkat细胞的增殖及侵袭,并诱导细胞凋亡,其作用机制可能与调控PTEN/PI3K/AKT信号通路有关。

Liqi Huoxue dripping pill protects against myocardial ischemia-reperfusion injury via the PI3K/Akt/GSK-3β signaling pathway in rats

Background:Liqi Huoxue dripping pill(LQHXDP),a traditional Chinese drug for coronary heart disease,has a protective effect on the heart of rats with myocardial ischemia-reperfusion injury(MIRI)in previous studies;however,its mechanism of action remains unclear.The purpose of this study was to investigate the protective mechanism of LQHXDP on MIRI in rats and its relationship with the PI3K/Akt signaling pathway.Methods:In this study,Sprague-Dawley rats were pre-infused with LQHXDP(175 mg/kg/d)for 10 days.PI3K inhibitor LY294002(0.3 mg/kg)was intravenously injected 15 minutes before ischemia.The rat model of MIRI was established by ligating the left anterior descending coronary artery.Subsequently,cardiac hemodynamics,serum myocardial injury markers,inflammatory factors,myocardial infarct size,antioxidant indexes,myocardial histopathology,and phosphorylation levels of key proteins of PI3K/Akt signaling pathway were assessed in rats.Results:LQHXDP was found to improve cardiac hemodynamic indexes,reduce serum creatine kinase MB isoenzyme activity and cardiac troponin and heart-type fatty acid binding protein levels,lower serum interleukin-1 beta,interleukin-6 and tumour necrosis factorαlevels,reduce the myocardial infarct size and enhance the antioxidant capacity of myocardial tissue in MIRI rats.Pathological analysis revealed that LQHXDP attenuated the extent of myocardial injury and protected mitochondria from damage in MIRI rats.Immunoblot analysis revealed that LQHXDP increased the expression levels of p-Akt and p-GSK-3βin MIRI rat cardiomyocytes.PI3K inhibitor LY294002 could impair these effects of LQHXDP.Conclusion:LQHXDP attenuated myocardial injury,attenuated oxidative stress injury and reduced inflammatory response in MIRI rats,and its protective effects were mediated by activating of PI3K/Akt/GSK-3βsignaling pathway.

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.

Alleviatory effect of isoquercetin on benign prostatic hyperplasia via IGF-1/PI3K/Akt/mTOR pathway

We evaluated the effect of isoquercetin(quercetin-O-3-glucoside-quercetin,IQ)as a functional component of Abeliophyllum disistichum Nakai ethanol extract(ADLE)on prostate cell proliferation and apoptosis and its effects on the IGF-1/PI3K/Akt/mTOR pathway in benign prostatic hyperplasia(BPH).Metabolites in ADLE were analyzed using UHPLC-qTOF-MS and HPLC.IQ was orally administered(1 or 10 mg/kg)to a testosterone propionate-induced BPH rat model,and its effects on the prostate weight were evaluated.The effect of IQ on androgen receptor(AR)signaling was analyzed in LNCaP cells.Whether IGF-1 and IQ affect the IGF-1/PI3K/Akt/mTOR pathway in BPH-1 cells was also examined.The metabolites in ADLE were identified and quantified,which confirmed that ADLE contained abundant IQ(20.88 mg/g).IQ significantly reduced the prostate size in a concentration-dependent manner in a BPH rat model,and significantly decreased the expression of AR signaling factors in the rat prostate tissue and LNCaP cells in a concentration-dependent manner.IQ also inhibited the PI3K/AKT/mTOR pathway activated by IGF-1 treatment in BPH-1 cells.In BPH-1 cells,IQ led to G0/G1 arrest and suppressed the expression of proliferation factors while inducing apoptosis.Thus,IQ shows potential for use as a pharmaceutical and nutraceutical for BPH.

加味沙参麦冬汤调控PTEN/PI3K/AKT通路对CAG大鼠的治疗作用

目的观察加味沙参麦冬汤对慢性萎缩性胃炎(CAG)大鼠胃黏膜细胞凋亡及对PTEN/PI3K/AKT通路的作用。方法将60只Wistar大鼠随机分为空白组、模型组、阳性对照组、加味沙参麦冬汤低剂量、中剂量、高剂量组共6组,每组各10只。除空白组外,其余大鼠饮用N-甲基-N’-硝基-N-亚硝基胍(MNNG)溶液以复制CAG模型。阳性对照组以维酶素作为阳性对照,于造模完成后给予0.3 g/kg维酶素混悬液灌胃,加味沙参麦冬汤低剂量、中剂量、高剂量组分别给予加味沙参麦冬汤不同剂量灌胃,每日给药1次,持续12周。采用中性红清除法观察胃黏膜血流量,ELISA实验检测血清中Fas、Fas L的含量,TUNEL染色检测胃黏膜细胞凋亡情况,免疫组织化学法及Western-blot法检测胃黏膜组织中PTEN/PI3K/AKT信号通路相关蛋白的表达。结果加味沙参麦冬汤不同剂量灌胃治疗后,胃黏膜血流量明显升高,血清中Fas、Fas L的水平显著降低,胃黏膜TUNEL凋亡阳性细胞明显减少,胃黏膜组织中AKT的阳性细胞数和蛋白表达显著减少(P<0.05),胃黏膜组织中PTEN的阳性细胞数和蛋白表达显著上调,PI3K的阳性细胞数和蛋白表达显著下调(P<0.05),且效果呈现剂量依赖性。结论加味沙参麦冬汤对CAG大鼠具有较好的治疗效果,能够通过抑制细胞过度凋亡保护黏膜上皮,同时通过增加PTEN的表达有效抑制PI3K/AKT信号通路的异常激活,发挥对CAG的防治作用。