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
目的探讨miR-let-7c-5p/c-myc信号轴在白血病细胞定向单核/巨噬细胞分化中的调控作用。方法采用PMA+LPS+IFN-γ诱导THP-1白血病细胞向单核/巨噬细胞定向分化,PBS作为对照组。诱导48 h后CCK8法测定细胞增殖水平;流式细胞仪测定细胞CD11b...目的探讨miR-let-7c-5p/c-myc信号轴在白血病细胞定向单核/巨噬细胞分化中的调控作用。方法采用PMA+LPS+IFN-γ诱导THP-1白血病细胞向单核/巨噬细胞定向分化,PBS作为对照组。诱导48 h后CCK8法测定细胞增殖水平;流式细胞仪测定细胞CD11b与CD14分化抗原表达水平;RT-qPCR检测白血病细胞分化前后miR-let-7c-5p和c-myc的表达变化;蛋白质印迹法检测c-myc蛋白表达变化;双荧光素酶结合实验检测miR-let-7c-5p与c-myc的3′UTR靶向结合和活性调控关系;转染miR-let-7c-5p mimic观察c-myc表达变化后细胞的增殖分化水平变化;过表达c-myc拯救实验观察miR-let-7c-5p对PMA+LPS+IFN-γ诱导的THP-1细胞增殖分化的影响。THP-1细胞转染miR-let-7c-5p inhibitor,观察c-myc表达变化对THP-1定向分化为M1样巨噬细胞的影响。结果与PBS对照组相比,PMA+LPS+IFN-γ诱导48 h后,THP-1细胞的增殖能力明显降低(0.64±0.01 vs 0.33±0.01,t=45.190,P<0.001)。PMA+LPS+IFN-γ实验组的CD11b和CD14平均阳性表达率升高[(5.51±0.89)%vs(17.72±0.86)%,t=17.050,P<0.001;(6.22±0.70)%vs(16.42±0.14)%,t=24.650,P<0.001]。PMA+LPS+IFN-γ实验组的c-myc蛋白表达水平降低(0.87±0.02 vs 0.64±0.06,t=6.041,P=0.004)。PMA+LPS+IFN-γ实验组的miR-let-7c-5p基因表达量高于对照组,而c-myc基因表达量低于对照组,均P<0.001。Luciferase实验证实,miR-let-7c-5p mimic+c-myc-WT组的荧光素酶活性明显低于mimics NC+c-myc-WT组(0.88±0.09 vs 0.62±0.05,t=4.320,P=0.013)。转染miR-let-7c-5p mimic后,miR-let-7c-5p mimic组的c-myc蛋白表达水平低于miR-let-7c-5p mimic NC组(1.03±0.08 vs 0.39±0.07,t=10.420,P<0.001),伴有细胞增殖水平的降低(0.64±0.01 vs 0.42±0.01,t=30.160,P<0.001),CD11b和CD14阳性表达率升高[(2.18±0.53)%vs(22.10±0.87)%,t=33.530,P<0.001;(3.37±0.73)%vs(22.98±5.43)%,t=6.195,P=0.004]。拯救实验结果表明,miR-let-7c-5p mimics+c-myc vector组的c-myc蛋白表达水平高于miR-let-7c-5p mimics组(0.53±0.02 vs 0.84±0.05,t=9.250,P<0.展开更多
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.
文摘目的探讨miR-let-7c-5p/c-myc信号轴在白血病细胞定向单核/巨噬细胞分化中的调控作用。方法采用PMA+LPS+IFN-γ诱导THP-1白血病细胞向单核/巨噬细胞定向分化,PBS作为对照组。诱导48 h后CCK8法测定细胞增殖水平;流式细胞仪测定细胞CD11b与CD14分化抗原表达水平;RT-qPCR检测白血病细胞分化前后miR-let-7c-5p和c-myc的表达变化;蛋白质印迹法检测c-myc蛋白表达变化;双荧光素酶结合实验检测miR-let-7c-5p与c-myc的3′UTR靶向结合和活性调控关系;转染miR-let-7c-5p mimic观察c-myc表达变化后细胞的增殖分化水平变化;过表达c-myc拯救实验观察miR-let-7c-5p对PMA+LPS+IFN-γ诱导的THP-1细胞增殖分化的影响。THP-1细胞转染miR-let-7c-5p inhibitor,观察c-myc表达变化对THP-1定向分化为M1样巨噬细胞的影响。结果与PBS对照组相比,PMA+LPS+IFN-γ诱导48 h后,THP-1细胞的增殖能力明显降低(0.64±0.01 vs 0.33±0.01,t=45.190,P<0.001)。PMA+LPS+IFN-γ实验组的CD11b和CD14平均阳性表达率升高[(5.51±0.89)%vs(17.72±0.86)%,t=17.050,P<0.001;(6.22±0.70)%vs(16.42±0.14)%,t=24.650,P<0.001]。PMA+LPS+IFN-γ实验组的c-myc蛋白表达水平降低(0.87±0.02 vs 0.64±0.06,t=6.041,P=0.004)。PMA+LPS+IFN-γ实验组的miR-let-7c-5p基因表达量高于对照组,而c-myc基因表达量低于对照组,均P<0.001。Luciferase实验证实,miR-let-7c-5p mimic+c-myc-WT组的荧光素酶活性明显低于mimics NC+c-myc-WT组(0.88±0.09 vs 0.62±0.05,t=4.320,P=0.013)。转染miR-let-7c-5p mimic后,miR-let-7c-5p mimic组的c-myc蛋白表达水平低于miR-let-7c-5p mimic NC组(1.03±0.08 vs 0.39±0.07,t=10.420,P<0.001),伴有细胞增殖水平的降低(0.64±0.01 vs 0.42±0.01,t=30.160,P<0.001),CD11b和CD14阳性表达率升高[(2.18±0.53)%vs(22.10±0.87)%,t=33.530,P<0.001;(3.37±0.73)%vs(22.98±5.43)%,t=6.195,P=0.004]。拯救实验结果表明,miR-let-7c-5p mimics+c-myc vector组的c-myc蛋白表达水平高于miR-let-7c-5p mimics组(0.53±0.02 vs 0.84±0.05,t=9.250,P<0.
