BACKGROUND Dysregulated microRNA(miRNA)is crucial in the progression of diabetic nephropathy(DN).AIM To investigate the potential molecular mechanism of Icariin(ICA)in regulating endoplasmic reticulum(ER)stress-mediat...BACKGROUND Dysregulated microRNA(miRNA)is crucial in the progression of diabetic nephropathy(DN).AIM To investigate the potential molecular mechanism of Icariin(ICA)in regulating endoplasmic reticulum(ER)stress-mediated apoptosis in high glucose(HG)-induced primary rat kidney cells(PRKs),with emphasis on the role of miR-503 and sirtuin 4(SIRT4)in this process.METHODS Single intraperitoneal injection of streptozotocin(65 mg/kg)in Sprague-Dawley rats induce DN in the in vivo hyperglycemic model.Glucose-treated PRKs were used as an in vitro HG model.An immunofluorescence assay identified isolated PRKs.Cell Counting Kit-8 and flow cytometry analyzed the effect of ICA treatment on cell viability and apoptosis,respectively.Real-time quantitative polymerase chain reaction and western blot analyzed the levels of ER stressrelated proteins.Dual luciferase analysis of miR-503 binding to downstream SIRT4 was performed.RESULTS ICA treatment alleviated the upregulated miR-503 expression in vivo(DN)and in vitro(HG).Mechanistically,ICA reduced HG-induced miR-503 overexpression,thereby counteracting its function in downregulating SIRT4 levels.ICA regulated the miR-503/SIRT4 axis and subsequent ER stress to alleviate HG-induced PRKs injury.CONCLUSION ICA reduced HG-mediated inhibition of cell viability,promotion of apoptosis,and ER stress in PRKs.These effects involved regulation of the miR-503/SIRT4 axis.These findings indicate the potential of ICA to treat DN,and implicate miR-503 as a viable target for therapeutic interventions in DN.展开更多
文摘目的探究miRNA-424-5p(miR-424-5p)调控SIRT4表达影响胃癌细胞迁移和侵袭能力的潜在分子机制。方法利用RT-qPCR检测57例胃癌患者肿瘤组织与癌旁组织中miR-424-5p和SIRT4的表达水平。用脂质体法将miR-424-5p inhibitor和miR-424-5p mimic分别瞬时转染入MNK-28和HGC-27胃癌细胞中,RT-qPCR检测细胞中miR-424-5p和SIRT4 mRNA的表达水平,Western Blot检测细胞中SIRT4蛋白的表达量,划痕愈合实验和Transwell侵袭实验检测各组细胞的迁移和侵袭能力。双荧光素酶基因报告实验检测miR-424-5p对SIRT4的靶向调控机制。共转染miR-424-5p和SIRT4进一步验证miR-424-5p和SIRT4对胃癌细胞迁移和侵袭能力的影响。结果胃癌组织中miR-424-5p的表达明显高于癌旁组织(P<0.001),SIRT4的表达水平明显低于癌旁组织(P<0.001),相关性分析表明胃癌组织中miR-424-5p的表达与SIRT4呈负相关(r=-0.382,P=0.034)。此外,miR-424-5p高表达与肿瘤的浸润深度、TNM分期、脉管侵犯和神经侵犯显著相关(均P<0.05)。过表达miR-424-5p能促进胃癌细胞迁移和侵袭能力,而抑制miR-424-5p表达则呈现出相反的效果。过表达miR-424-5p可降低胃癌细胞中SIRT4 m RNA和蛋白的表达水平,相反,抑制miR-424-5p表达则上调胃癌细胞中SIRT4 m RNA和蛋白的表达水平。双荧光素酶报告基因实验显示miR-424-5p能显著影响野生型SIRT4-3’UTR表达载体的荧光素酶活性。回复实验结果显示miR-424-5p和SIRT4能显著影响胃癌细胞的迁移和侵袭能力。结论miR-424-5p在胃癌中高表达,其通过靶向抑制抑癌基因SIRT4的表达促进肿瘤细胞的迁移和侵袭,从而参与胃癌的的发生、发展。
基金The First Affiliated Hospital of Guangzhou University of Chinese Medicine Innovation and Strengthening Fund,No.2019QN14.
文摘BACKGROUND Dysregulated microRNA(miRNA)is crucial in the progression of diabetic nephropathy(DN).AIM To investigate the potential molecular mechanism of Icariin(ICA)in regulating endoplasmic reticulum(ER)stress-mediated apoptosis in high glucose(HG)-induced primary rat kidney cells(PRKs),with emphasis on the role of miR-503 and sirtuin 4(SIRT4)in this process.METHODS Single intraperitoneal injection of streptozotocin(65 mg/kg)in Sprague-Dawley rats induce DN in the in vivo hyperglycemic model.Glucose-treated PRKs were used as an in vitro HG model.An immunofluorescence assay identified isolated PRKs.Cell Counting Kit-8 and flow cytometry analyzed the effect of ICA treatment on cell viability and apoptosis,respectively.Real-time quantitative polymerase chain reaction and western blot analyzed the levels of ER stressrelated proteins.Dual luciferase analysis of miR-503 binding to downstream SIRT4 was performed.RESULTS ICA treatment alleviated the upregulated miR-503 expression in vivo(DN)and in vitro(HG).Mechanistically,ICA reduced HG-induced miR-503 overexpression,thereby counteracting its function in downregulating SIRT4 levels.ICA regulated the miR-503/SIRT4 axis and subsequent ER stress to alleviate HG-induced PRKs injury.CONCLUSION ICA reduced HG-mediated inhibition of cell viability,promotion of apoptosis,and ER stress in PRKs.These effects involved regulation of the miR-503/SIRT4 axis.These findings indicate the potential of ICA to treat DN,and implicate miR-503 as a viable target for therapeutic interventions in DN.
