背景胰腺腺泡细胞增殖及凋亡与急性胰腺炎(acute pancreatitis,AP)发生密切相关,miRNA可通过调控靶基因表达从而参与细胞增殖及凋亡过程,因而寻找与胰腺腺泡细胞增殖及凋亡相关的miRNA分子标志物对临床诊断及治疗AP具有重要意义.目的探...背景胰腺腺泡细胞增殖及凋亡与急性胰腺炎(acute pancreatitis,AP)发生密切相关,miRNA可通过调控靶基因表达从而参与细胞增殖及凋亡过程,因而寻找与胰腺腺泡细胞增殖及凋亡相关的miRNA分子标志物对临床诊断及治疗AP具有重要意义.目的探讨微小RNA-7a-5p(miR-7a-5p)对AP腺泡细胞增殖、凋亡的影响及机制.方法构建雨蛙肽诱导的AP模型并收集胰腺炎腺泡细胞AR42J(雨蛙肽组),采用qRT-PCR与Western blot分别检测未经雨蛙肽诱导的AR42J细胞(对照组)及雨蛙肽组AR42J细胞中miR-7a-5p相对表达量及活化信号转导和转录激活因子的蛋白抑制因子-1(proteininhibitor of activated signal transducer and activator oftranscription 1,PIAS1)表达.分别将anti-miR-7a-5p、pcDNA-PIAS1转染至雨蛙肽组AR42J细胞,采用MTT法检测AR42J细胞增殖能力,流式细胞术检测AR42J细胞凋亡.荧光素酶报告系统检测miR-7a-5p对PIAS1基因的靶向调控作用,并采用Western blot检测miR-7a-5p对PIAS1蛋白表达的调控作用.采用RNA干扰技术沉默PIAS1表达(si-PIAS1组),分别将si-PIAS1及其阴性对照转染至anti-miR-7a-5p组AR42J细胞,观察AR42J细胞增殖及凋亡能力.结果与对照组相比,雨蛙肽组AR42J细胞中miR-7a-5p表达水平显著升高(P<0.05),PIAS1蛋白表达显著降低(P<0.05);抑制miR-7a-5p表达可促进胰腺炎腺泡细胞AR42J增殖并抑制其凋亡;miR-7a-5p可负向调控靶基因PIAS1表达;PIAS1过表达可促进AR42J细胞增殖并抑制其凋亡;与anti-miR-7a-5p+si-NC组相比,anti-miR-7a-5p+si-PIAS1组AR42J细胞活性显著降低(P<0.05),细胞凋亡率显著升高(P<0.05).结论miR-7a-5p可通过抑制PIAS1表达进而促进AP腺泡细胞凋亡并降低细胞增殖能力.展开更多
Viral myocarditis(VMC)is one of the most common acquired heart diseases in children and teenagers.However,its pathogenesis is still unclear,and effective treatments are lacking.This study aimed to investigate the regu...Viral myocarditis(VMC)is one of the most common acquired heart diseases in children and teenagers.However,its pathogenesis is still unclear,and effective treatments are lacking.This study aimed to investigate the regulatory pathway by which exosomes alleviate ferroptosis in cardiomyocytes(CMCs)induced by coxsackievirus B3(CVB3).CVB3 was utilized for inducing the VMC mouse model and cellular model.Cardiac echocardiography,left ventricular ejection fraction(LVEF),and left ventricular fractional shortening(LVFS)were implemented to assess the cardiac function.In CVB3-induced VMC mice,cardiac insufficiency was observed,as well as the altered levels of ferroptosis-related indicators(glutathione) peroxidase 4(GPX4),glutathione(GSH),and malondialdehyde(MDA).However,exosomes derived from human umbilical cord mesenchymal stem cells(hucMSCs-exo)could restore the changes caused by CVB3 stimulation.Let-7a-5p was enriched in hucMSCs-exo,and the inhibitory ffect of hucMSCs-exoa-ie-pmimo on CVB3-induced ferroptosis was higher than that of hucMSCs-exommie N(NC:negative control).Mothers against decapentaplegic homolog 2(SMAD2)increased in the VMC group,while the expression of zinc-finger protein 36(ZFP36)decreased.Let-7a-5p was confirmed to interact with SMAD2 messenger RNA(mRNA),and the SMAD2 protein interacted directly with the ZFP36 protein.Silencing SMAD2 and overexpressing ZFP36 inhibited the expression of ferroptosis-related indicators.Meanwhile,the levels of GPX4,solute carrier family 7,member 11(SLC7A11),and GSH were lower in the SMAD2 overexpression plasmid(oe-SMAD2)+let-7a-5p mimic group than in the oe-NC+let-7a-5p mimic group,while those of MDA,reactive oxygen species(ROS),and Fe^(2+)increased.In conclusion,these data showed that ferroptosis could be regulated by mediating SMAD2 expression.Exo-let-7a-5p derived from hucMSCs could mediate SMAD2 to promote the expression of ZFP36,which further inhibited the ferroptosis of CMCs to alleviate CVB3-induced VMC.展开更多
BACKGROUND Primary sclerosing cholangitis(PSC)is characterized by chronic inflammation and it predisposes to cholangiocarcinoma due to lack of effective treatment options.Recombinant adeno-associated virus(rAAV)provid...BACKGROUND Primary sclerosing cholangitis(PSC)is characterized by chronic inflammation and it predisposes to cholangiocarcinoma due to lack of effective treatment options.Recombinant adeno-associated virus(rAAV)provides a promising platform for gene therapy on such kinds of diseases.A microRNA(miRNA)let-7a has been reported to be associated with the progress of PSC but the potential therapeutic implication of inhibition of let-7a on PSC has not been evaluated.AIM To investigate the therapeutic effects of inhibition of a miRNA let-7a transferred by recombinant adeno-associated virus 8(rAAV8)on a xenobiotic-induced mouse model of sclerosing cholangitis.METHODS A xenobiotic-induced mouse model of sclerosing cholangitis was induced by 0.1% 3,5-Diethoxycarbonyl-1,4-Dihydrocollidine(DDC)feeding for 2 wk or 6 wk.A single dose of rAAV8-mediated anti-let-7a-5p sponges or scramble control was injected in vivo into mice onset of DDC feeding.Upon sacrifice,the liver and the serum were collected from each mouse.The hepatobiliary injuries,hepatic inflammation and fibrosis were evaluated.The targets of let-7a-5p and downstream molecule NF-κB were detected using Western blot.RESULTS rAAV8-mediated anti-let-7a-5p sponges can depress the expression of let-7a-5p in mice after DDC feeding for 2 wk or 6 wk.The reduced expression of let-7a-5p can alleviate hepato-biliary injuries indicated by serum markers,and prevent the proliferation of cholangiocytes and biliary fibrosis.Furthermore,inhibition of let-7a mediated by rAAV8 can increase the expression of potential target molecules such as suppressor of cytokine signaling 1 and Dectin1,which consequently inhibit of NF-κB-mediated hepatic inflammation.CONCLUSION Our study demonstrates that a rAAV8 vector designed for liver-specific inhibition of let-7a-5p can potently ameliorate symptoms in a xenobiotic-induced mouse model of sclerosing cholangitis,which provides a possible clinical translation of PSC of human.展开更多
文摘背景胰腺腺泡细胞增殖及凋亡与急性胰腺炎(acute pancreatitis,AP)发生密切相关,miRNA可通过调控靶基因表达从而参与细胞增殖及凋亡过程,因而寻找与胰腺腺泡细胞增殖及凋亡相关的miRNA分子标志物对临床诊断及治疗AP具有重要意义.目的探讨微小RNA-7a-5p(miR-7a-5p)对AP腺泡细胞增殖、凋亡的影响及机制.方法构建雨蛙肽诱导的AP模型并收集胰腺炎腺泡细胞AR42J(雨蛙肽组),采用qRT-PCR与Western blot分别检测未经雨蛙肽诱导的AR42J细胞(对照组)及雨蛙肽组AR42J细胞中miR-7a-5p相对表达量及活化信号转导和转录激活因子的蛋白抑制因子-1(proteininhibitor of activated signal transducer and activator oftranscription 1,PIAS1)表达.分别将anti-miR-7a-5p、pcDNA-PIAS1转染至雨蛙肽组AR42J细胞,采用MTT法检测AR42J细胞增殖能力,流式细胞术检测AR42J细胞凋亡.荧光素酶报告系统检测miR-7a-5p对PIAS1基因的靶向调控作用,并采用Western blot检测miR-7a-5p对PIAS1蛋白表达的调控作用.采用RNA干扰技术沉默PIAS1表达(si-PIAS1组),分别将si-PIAS1及其阴性对照转染至anti-miR-7a-5p组AR42J细胞,观察AR42J细胞增殖及凋亡能力.结果与对照组相比,雨蛙肽组AR42J细胞中miR-7a-5p表达水平显著升高(P<0.05),PIAS1蛋白表达显著降低(P<0.05);抑制miR-7a-5p表达可促进胰腺炎腺泡细胞AR42J增殖并抑制其凋亡;miR-7a-5p可负向调控靶基因PIAS1表达;PIAS1过表达可促进AR42J细胞增殖并抑制其凋亡;与anti-miR-7a-5p+si-NC组相比,anti-miR-7a-5p+si-PIAS1组AR42J细胞活性显著降低(P<0.05),细胞凋亡率显著升高(P<0.05).结论miR-7a-5p可通过抑制PIAS1表达进而促进AP腺泡细胞凋亡并降低细胞增殖能力.
基金supported by the China Postdoctoral Science Foundation(No.2022M712252)the Natural Science Foundation of Sichuan Province,China(No.2023NSFSC1634).
文摘Viral myocarditis(VMC)is one of the most common acquired heart diseases in children and teenagers.However,its pathogenesis is still unclear,and effective treatments are lacking.This study aimed to investigate the regulatory pathway by which exosomes alleviate ferroptosis in cardiomyocytes(CMCs)induced by coxsackievirus B3(CVB3).CVB3 was utilized for inducing the VMC mouse model and cellular model.Cardiac echocardiography,left ventricular ejection fraction(LVEF),and left ventricular fractional shortening(LVFS)were implemented to assess the cardiac function.In CVB3-induced VMC mice,cardiac insufficiency was observed,as well as the altered levels of ferroptosis-related indicators(glutathione) peroxidase 4(GPX4),glutathione(GSH),and malondialdehyde(MDA).However,exosomes derived from human umbilical cord mesenchymal stem cells(hucMSCs-exo)could restore the changes caused by CVB3 stimulation.Let-7a-5p was enriched in hucMSCs-exo,and the inhibitory ffect of hucMSCs-exoa-ie-pmimo on CVB3-induced ferroptosis was higher than that of hucMSCs-exommie N(NC:negative control).Mothers against decapentaplegic homolog 2(SMAD2)increased in the VMC group,while the expression of zinc-finger protein 36(ZFP36)decreased.Let-7a-5p was confirmed to interact with SMAD2 messenger RNA(mRNA),and the SMAD2 protein interacted directly with the ZFP36 protein.Silencing SMAD2 and overexpressing ZFP36 inhibited the expression of ferroptosis-related indicators.Meanwhile,the levels of GPX4,solute carrier family 7,member 11(SLC7A11),and GSH were lower in the SMAD2 overexpression plasmid(oe-SMAD2)+let-7a-5p mimic group than in the oe-NC+let-7a-5p mimic group,while those of MDA,reactive oxygen species(ROS),and Fe^(2+)increased.In conclusion,these data showed that ferroptosis could be regulated by mediating SMAD2 expression.Exo-let-7a-5p derived from hucMSCs could mediate SMAD2 to promote the expression of ZFP36,which further inhibited the ferroptosis of CMCs to alleviate CVB3-induced VMC.
基金Supported by the National Natural Science Foundation of China,No.82172297Natural Science Foundation of Jiangsu Province of China,No.BK20211346 and No.BK20201011+1 种基金Natural Science Foundation of Jiangsu Higher Education Institutions of China,No.22KJA310007Xuzhou Science and Technology Project,No.KC22055.
文摘BACKGROUND Primary sclerosing cholangitis(PSC)is characterized by chronic inflammation and it predisposes to cholangiocarcinoma due to lack of effective treatment options.Recombinant adeno-associated virus(rAAV)provides a promising platform for gene therapy on such kinds of diseases.A microRNA(miRNA)let-7a has been reported to be associated with the progress of PSC but the potential therapeutic implication of inhibition of let-7a on PSC has not been evaluated.AIM To investigate the therapeutic effects of inhibition of a miRNA let-7a transferred by recombinant adeno-associated virus 8(rAAV8)on a xenobiotic-induced mouse model of sclerosing cholangitis.METHODS A xenobiotic-induced mouse model of sclerosing cholangitis was induced by 0.1% 3,5-Diethoxycarbonyl-1,4-Dihydrocollidine(DDC)feeding for 2 wk or 6 wk.A single dose of rAAV8-mediated anti-let-7a-5p sponges or scramble control was injected in vivo into mice onset of DDC feeding.Upon sacrifice,the liver and the serum were collected from each mouse.The hepatobiliary injuries,hepatic inflammation and fibrosis were evaluated.The targets of let-7a-5p and downstream molecule NF-κB were detected using Western blot.RESULTS rAAV8-mediated anti-let-7a-5p sponges can depress the expression of let-7a-5p in mice after DDC feeding for 2 wk or 6 wk.The reduced expression of let-7a-5p can alleviate hepato-biliary injuries indicated by serum markers,and prevent the proliferation of cholangiocytes and biliary fibrosis.Furthermore,inhibition of let-7a mediated by rAAV8 can increase the expression of potential target molecules such as suppressor of cytokine signaling 1 and Dectin1,which consequently inhibit of NF-κB-mediated hepatic inflammation.CONCLUSION Our study demonstrates that a rAAV8 vector designed for liver-specific inhibition of let-7a-5p can potently ameliorate symptoms in a xenobiotic-induced mouse model of sclerosing cholangitis,which provides a possible clinical translation of PSC of human.
