Background Atresia and degeneration,a follicular developmental fate that reduces female fertility and is triggered by granulosa cell(GC)apoptosis,have been induced by dozens of miRNAs.Here,we report a miRNA,miR-423,th...Background Atresia and degeneration,a follicular developmental fate that reduces female fertility and is triggered by granulosa cell(GC)apoptosis,have been induced by dozens of miRNAs.Here,we report a miRNA,miR-423,that inhibits the initiation of follicular atresia(FA),and early apoptosis of GCs.Results We showed that miR-423 was down-regulated during sow FA,and its levels in follicles were negatively correlated with the GC density and the P4/E2 ratio in the follicular fluid in vivo.The in vitro gain-of-function experiments revealed that miR-423 suppresses cell apoptosis,especially early apoptosis in GCs.Mechanically speaking,the miR-423 targets and interacts with the 3’-UTR of the porcine SMAD7 gene,which encodes an apoptosis-inducing factor in GCs,and represses its expression and pro-apoptotic function.Interestingly,FA and the GC apoptosis-related lncRNA NORHA was demonstrated as a ceRNA of miR-423.Additionally,we showed that a single base deletion/insertion in the miR-423 promoter is significantly associated with the number of stillbirths(NSB)trait of sows.Conclusion These results demonstrate that miR-423 is a small molecule for inhibiting FA initiation and GC early apoptosis,suggesting that treating with miR-423 may be a novel approach for inhibiting FA initiation and improving female fertility.展开更多
目的探究microRNA-423-5p(miR-423-5p)调节磷脂酰肌醇-3-激酶/丝苏氨酸蛋白激酶(PI3K/AKT)通路在心力衰竭进展中的作用。方法构建大鼠心力衰竭模型,同时用AngⅡ处理(100 n M,24 h)大鼠心肌细胞H9C2构建心力衰竭体外模型。H9C2细胞转染mi...目的探究microRNA-423-5p(miR-423-5p)调节磷脂酰肌醇-3-激酶/丝苏氨酸蛋白激酶(PI3K/AKT)通路在心力衰竭进展中的作用。方法构建大鼠心力衰竭模型,同时用AngⅡ处理(100 n M,24 h)大鼠心肌细胞H9C2构建心力衰竭体外模型。H9C2细胞转染miR-423-5p的抑制剂和模拟剂实现miR-423-5p的敲除和过表达;LY294002用来抑制PI3K/AKT通路的激活。RT-PCR技术检测miR-423-5p的表达; Western blot检测凋亡相关蛋白Bcl-2、Bax、casapse-3/9及PI3K、AKT总蛋白及磷酸化蛋白的表达;流式细胞术检测细胞凋亡。结果 miR-423-5p的表达水平在模型组大鼠心肌组织和AngⅡ处理的H9C2细胞中升高;敲除miR-423-5p可抑制由AngⅡ造成的H9C2细胞凋亡,并促进了p-PI3K及p-AKT的表达,但敲除miR-423-5p的以上作用在PI3K/AKT通路被抑制后全部削弱。结论敲除miR-423-5p可通过激活PI3K/AKT通路抑制心肌细胞凋亡,进而缓解心力衰竭的恶性进展。展开更多
目的探讨Polo样蛋白激酶1(Polo-like protein kinase 1,PLK1)抑制剂BI-2536对人肝癌SNU-423细胞增殖及侵袭的影响。方法体外培养人肝癌SNU-423细胞,采用不同浓度梯度的BI-2536作用于SNU-423细胞,同时设对照组(未加BI-2536),MTT法检测BI-...目的探讨Polo样蛋白激酶1(Polo-like protein kinase 1,PLK1)抑制剂BI-2536对人肝癌SNU-423细胞增殖及侵袭的影响。方法体外培养人肝癌SNU-423细胞,采用不同浓度梯度的BI-2536作用于SNU-423细胞,同时设对照组(未加BI-2536),MTT法检测BI-2536对人肝癌SNU-423细胞的抑制率,划痕试验检测BI-2536对人肝癌SNU-423细胞侵袭和迁移能力的影响。结果SNU-423细胞经BI-2536处理48 h后的IC50为5.036μmol/L。SNU-423细胞的增殖抑制率随BI-2536浓度的增加明显上升(P<0.01);经BI-2536作用的SNU-423细胞迁移率明显低于对照组(P<0.01),随药物浓度的增高,SNU-423细胞出现凋亡现象。结论BI-2536可抑制人肝癌SNU-423细胞的增殖及迁移能力,PLK1可作为肝癌治疗中的新靶点。展开更多
基金supported by the National Key R&D Program of China(2022YFD1600903)the National Natural Science Foundation of China(32072693)the College Students’Innovative Entrepreneurial Training Plan Program(202110307028).
文摘Background Atresia and degeneration,a follicular developmental fate that reduces female fertility and is triggered by granulosa cell(GC)apoptosis,have been induced by dozens of miRNAs.Here,we report a miRNA,miR-423,that inhibits the initiation of follicular atresia(FA),and early apoptosis of GCs.Results We showed that miR-423 was down-regulated during sow FA,and its levels in follicles were negatively correlated with the GC density and the P4/E2 ratio in the follicular fluid in vivo.The in vitro gain-of-function experiments revealed that miR-423 suppresses cell apoptosis,especially early apoptosis in GCs.Mechanically speaking,the miR-423 targets and interacts with the 3’-UTR of the porcine SMAD7 gene,which encodes an apoptosis-inducing factor in GCs,and represses its expression and pro-apoptotic function.Interestingly,FA and the GC apoptosis-related lncRNA NORHA was demonstrated as a ceRNA of miR-423.Additionally,we showed that a single base deletion/insertion in the miR-423 promoter is significantly associated with the number of stillbirths(NSB)trait of sows.Conclusion These results demonstrate that miR-423 is a small molecule for inhibiting FA initiation and GC early apoptosis,suggesting that treating with miR-423 may be a novel approach for inhibiting FA initiation and improving female fertility.
文摘目的探究microRNA-423-5p(miR-423-5p)调节磷脂酰肌醇-3-激酶/丝苏氨酸蛋白激酶(PI3K/AKT)通路在心力衰竭进展中的作用。方法构建大鼠心力衰竭模型,同时用AngⅡ处理(100 n M,24 h)大鼠心肌细胞H9C2构建心力衰竭体外模型。H9C2细胞转染miR-423-5p的抑制剂和模拟剂实现miR-423-5p的敲除和过表达;LY294002用来抑制PI3K/AKT通路的激活。RT-PCR技术检测miR-423-5p的表达; Western blot检测凋亡相关蛋白Bcl-2、Bax、casapse-3/9及PI3K、AKT总蛋白及磷酸化蛋白的表达;流式细胞术检测细胞凋亡。结果 miR-423-5p的表达水平在模型组大鼠心肌组织和AngⅡ处理的H9C2细胞中升高;敲除miR-423-5p可抑制由AngⅡ造成的H9C2细胞凋亡,并促进了p-PI3K及p-AKT的表达,但敲除miR-423-5p的以上作用在PI3K/AKT通路被抑制后全部削弱。结论敲除miR-423-5p可通过激活PI3K/AKT通路抑制心肌细胞凋亡,进而缓解心力衰竭的恶性进展。
文摘目的探讨Polo样蛋白激酶1(Polo-like protein kinase 1,PLK1)抑制剂BI-2536对人肝癌SNU-423细胞增殖及侵袭的影响。方法体外培养人肝癌SNU-423细胞,采用不同浓度梯度的BI-2536作用于SNU-423细胞,同时设对照组(未加BI-2536),MTT法检测BI-2536对人肝癌SNU-423细胞的抑制率,划痕试验检测BI-2536对人肝癌SNU-423细胞侵袭和迁移能力的影响。结果SNU-423细胞经BI-2536处理48 h后的IC50为5.036μmol/L。SNU-423细胞的增殖抑制率随BI-2536浓度的增加明显上升(P<0.01);经BI-2536作用的SNU-423细胞迁移率明显低于对照组(P<0.01),随药物浓度的增高,SNU-423细胞出现凋亡现象。结论BI-2536可抑制人肝癌SNU-423细胞的增殖及迁移能力,PLK1可作为肝癌治疗中的新靶点。
