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第42卷第3期 南京医科大学学报(自然科学版)
2022年3月 Journal of Nanjing Medical University(Natural Sciences) ·325 ·
·基础研究·
MiR⁃484通过靶向MAPK8抑制人前体脂肪细胞的增殖与分化
仲逢钰,秦振英,李 婧,田 甜,牟雨虹,田慧琴,胡幼芳 *
南京医科大学第一附属医院儿童保健科,江苏 南京 210029
[摘 要] 目的:探讨miRNA⁃484在肥胖发生中的作用及其临床意义。方法:利用RT⁃qPCR 、CCK⁃8法、油红O染色及甘油三
酯定量检测研究miR⁃484对人脂肪细胞增殖及成脂分化的作用。运用Targetscan7.2对miR⁃484的下游靶基因进行预测分析,并使
用双荧光素酶实验验证miR⁃484与靶基因的结合,使用Western blot及RT⁃qPCR验证miR⁃484对靶基因的作用。结果:miR⁃484在
人脂肪细胞分化成熟过程中逐渐低表达。过表达miR⁃484抑制人前体脂肪细胞的增殖及分化,而沉默miR⁃484与过表达作用
相反。生物信息学预测发现MAPK8是miR⁃484的下游靶基因,且miR⁃484可抑制其mRNA及蛋白表达,同时过表达MAPK8可
部分挽救miR⁃484对人前体脂肪细胞增殖分化的抑制。结论:miR⁃484可以通过抑制MAPK8的表达从而抑制人前体脂肪细胞
的增殖与成脂分化。
[关键词] miR⁃484;人前体脂肪细胞;增殖;成脂分化;肥胖
[中图分类号] R589.2 [文献标志码] A [文章编号] 1007⁃4368(2022)03⁃325⁃08
doi:10.7655/NYDXBNS20220303
MiR⁃484 inhibits human pre⁃adipocyte differentiation and proliferation by targeting MAPK8
ZHONG Fengyu,QIN Zhenying,LI Jing,TIAN Tian,MU Yuhong,TIAN Huiqin,HU Youfang *
Department of Child Health Care,the First Affiliated Hospital of Nanjing Medical University,Nanjing 210029,China
[Abstract] Objective:This study aims to investigate the role of miR⁃484 in adipogenesis and its clinical potentiality. Methods:To
explore the function of miR⁃484 in human pre⁃adipocyte(HPA)differentiation and proliferation,RT⁃qPCR,CCK⁃8,red oil staining and
triglyceride content assays were conducted. Additionally,a dual⁃luciferase reporter assay demonstrated MAPK8,which predicted by
Targetscan7.2,was a direct target gene of miR⁃484 during preadipocyte differentiation,and the results were confirmed by RT⁃qPCR
and Western blot. Results:The miR⁃484 was down⁃regulated during HPA differentiation. The miR⁃484 inhibited the proliferation and
differentiation in HPA,and silencing miR⁃484 had the opposite effects. A dual⁃luciferase reporter assay demonstrated MAPK8 was a
direct target gene of miR⁃484. Additionally,over expression of MAPK8 could reserve the negative effect of miR⁃484 on differentiation
and proliferation of pre⁃adipocytes. Conclusion:MiR⁃484 could inhibit HPA differentiation and proliferation by targeting MAPK8.
[Key words] miR⁃484;human pre⁃adipocyte;proliferation;adipogenic differentiation;obesity
[J Nanjing Med Univ,2022,42(03):325⁃332]
世界卫生组织报道,自 1975 年以来,全球肥胖 代谢紊乱相关疾病的发生,如2型糖尿病、非酒精性
人数几乎增加了两倍,现共有 6 000 万 5 岁以下儿 脂肪肝和心血管疾病 [2- 3] 。脂肪组织不仅是储能器
童患上肥胖症,肥胖已成为一个严重的公共健康问 官,为人体的生命活动提供能量,也是人体重要的
[1]
题 。肥胖以脂肪大量堆积为特征,并可导致多种 内分泌器官,可分泌多种细胞因子,具有重要生理
功能 [4- 5] 。然而,由于能量摄入与消耗的不平衡,大
量能量以甘油三酯的形式储存,脂肪组织迅速膨
[基金项目] 国家自然科学基金(81700707);江苏省妇幼健
胀,脂肪组织的扩张将导致炎性细胞因子分泌增
康科研项目面上项目(F201804)
加,并减少瘦素和脂联素等抗炎蛋白的分泌,从而
∗
通信作者(Corresponding author),E⁃mail:13182823903@163.
com 导致代谢紊乱 [6-7] 。因此,深入研究脂肪组织的生成