miR-135a-5p靶向抑制Kif3B调控小鼠腭胚突间充质细胞的自噬  

miR-135a-5p regulates autophagy of mouse embryonic palatal mesenchymal cells via targeting Kif3B

作　　者：冯文宣 廉舒博 王哲 陈靖 何苇 Feng Wenxuan;Lian Shubo;Wang Zhe;Chen Jing;He Wei(School of Stomatology,Zunyi Medical University,Zunyi 563000,Guizhou Province,China;Hospital of Stomatology,Zunyi Medical University,Zunyi 563000,Guizhou Province,China)

机构地区：[1]遵义医科大学,口腔医学院,贵州省遵义市563000 [2]遵义医科大学附属口腔医院,贵州省遵义市563000

出　　处：《中国组织工程研究》2024年第19期3003-3011,共9页Chinese Journal of Tissue Engineering Research

基　　金：国家自然科学基金(82160176),项目负责人:何苇;遵义医科大学研究生科研基金立项项目(ZYK65),项目负责人:冯文宣。

摘　　要：背景:研究表明,在地塞米松诱导腭裂的小鼠胚胎腭突间充质细胞中miR-135a-5p呈高表达,初级纤毛及其介导的Shh信号通路参与小鼠胚胎腭突间充质细胞的自噬。由此猜测miR-135a-5p可能通过初级纤毛及其介导的Shh信号途径调控小鼠胚胎腭突间充质细胞的自噬。目的:探讨miR-135a-5p对小鼠胚胎腭突间充质细胞自噬的调控作用。方法:体外提取并培养C57BL/6J小鼠胚胎腭突间充质细胞。细胞转染分别设置为:①对照组、miR-135a-5p阴性对照组、miR-135a-5p模拟物组。②NC+miR-NC组、KIF3B过表达组、miR-135a-5p+KIF3B组。qRT-PCR验证miR-135a-5p、KIF3B的转染效率;透射电镜观察各组细胞中自噬小体/自噬溶酶体的数目;免疫荧光技术测定自噬标记物LC3B的荧光表达程度;Western blot检测KIF3B、LC3和P62的蛋白表达。③miR-135a-5p阴性对照组、SAG处理组、SAG+miR-135a-5p组。qRT-PCR检测Shh信号下游关键转录因子Gli3的mRNA表达水平;Western blot检测自噬相关蛋白LC3和P62的蛋白表达。结果与结论:①过表达miR-135a-5p后,细胞内自噬小体/自噬溶酶体数量显著增多(P<0.01);LC3B的荧光密度显著升高(P<0.01),KIF3B、P62的蛋白表达降低(P<0.01),LC3的蛋白表达升高;②过表达KIF3B后,细胞内自噬小体/自噬溶酶体数目明显减少(P<0.01),LC3B的荧光密度降低(P<0.01),P62的蛋白表达升高(P<0.01),LC3的蛋白表达下降(P<0.01);miR-135a-5p靶向抑制KIF3B的表达(P<0.01),并使自噬小体/自噬溶酶体数目、LC3B的荧光强度以及LC3的蛋白表达得到回升(P<0.01),P62的蛋白表达下降(P<0.01);③SAG使Gli3的mRNA表达明显升高(P<0.01),P62的蛋白表达升高(P<0.01),LC3的蛋白表达下降(P<0.01);加入miR-135a-5p后,Gli3的mRNA表达显著下降(P<0.01),P62的蛋白表达下降(P<0.01),LC3的蛋白表达回升(P<0.01);④结果表明:miR-135a-5p靶向抑制KIF3B并且可能通过负向调控Shh信号通路促进小鼠胚胎间充质细胞自噬。BACKGROUND:Studies demonstrated that miR-135a-5p was highly expressed in mouse embryonic palatal mesenchymal cells with cleft palate induced by dexamethasone.The primary cilium and its mediated Shh signaling pathway were involved in the autophagy of mouse embryonic palatal mesenchymal cells.It is speculated that miR-135a-5p may regulate autophagy in mouse embryonic palatal mesenchymal cells through primary cilia and its mediated Shh signaling pathway.OBJECTIVE:To investigate the regulatory effect of miR-135a-5p on autophagy of mouse embryonic palatal mesenchymal cells.METHODS:In vitro,palatal mesenchymal cells from C57BL/6J mouse embryos were extracted and cultured.Cell transfections were set up as follows:(1)the cells were divided into control group,miR-135a-5p negative control group and miR-135a-5p mimic group;(2)NC+miR-NC group,KIF3B overexpression group,and miR-135a-5p+KIF3B group:qRT-PCR was performed to verify transfection efficiency of miR-135a-5p and KIF3B.A transmission electron microscope was used to observe the number of autophagosome/autophagolysosome in the cells of each group.The degree of fluorescence expression of autophagy marker LC3B was determined by the immunofluorescence technique.The protein expression of KIF3B,LC3 and P62 was determined by western blot assay.(3)The cells were divided into miR-135a-5p negative control group,and SAG treated group,and SAG+miR-135a-5p group.qRT-PCR was used to detect the mRNA expression levels of Gli3,a key transcription factor downstream of Shh signaling.The protein expressions of autophagy-related proteins LC3 and P62 were detected by western blot assay.RESULTS AND CONCLUSION:(1)After overexpression of miR-135a-5p,the number of autophagosome/autophagolysosome was significantly increased(P<0.01).The fluorescence density of LC3B increased significantly(P<0.01);the protein expression of KIF3B and P62 decreased(P<0.01),and the protein expression of LC3 increased.(2)After overexpression of KIF3B,the number of autophagosome/autophagolysosome was significantly decre

关 键 词：自噬 胚胎腭突间充质细胞 miRNA KIF3B SHH信号通路 腭裂 

分 类 号：R459.9[医药卫生—治疗学] R318[医药卫生—临床医学] R782.22