5-Aza-CdR通过抑制大鼠原代肾肌成纤维细胞Epo基因启动子高甲基化逆转PMT  

5-Aza-CdR reverses pericyte-myofibroblast transition by inhibiting Epo gene promoter hypermethylation in rat primary renal myofibroblasts

作　　者：袁玲[1] 王蕾[1] 程鹏[1] 江茜 崔晓雪[1] YUAN Ling;WANG Lei;CHENG Peng;JIANG Qian;CUI Xiaoxue(Tianjin Institute of Medical and pharmaceutical Science,Tianjin 300020,China)

机构地区：[1]天津市医药科学研究所,天津300020

出　　处：《中国比较医学杂志》2025年第1期79-85,共7页Chinese Journal of Comparative Medicine

基　　金：天津市卫生健康科技项目(TJWJ2022MS050)。

摘　　要：目的观察去甲基化剂5-氮杂-2’脱氧胞苷(5-aza-2’-deoxycytidine,5-Aza-CdR)对大鼠原代肾肌成纤维细胞的周细胞肌成纤维细胞转化(pericyte-myofibroblast transition,PMT)的影响。方法取5-Aza-CdR 250 ng/mL处理大鼠原代肾肌成纤维细胞72 h,采用焦磷酸测序方法检测促红细胞生成素(erythropoietin,EPO)基因启动子甲基化程度,采用免疫荧光与Western blot检测α-平滑肌肌动蛋白(alpha-smooth muscle actin,α-SMΑ)、血小板源性生长因子受体β(platelet-derived growth factor receptorβ,PDGFRβ)和DNA甲基转移酶3a(DNA methyltransferase 3a,Dnmt3a)的蛋白表达水平,并检测细胞上清液EPO水平。结果与对照组相比,5-Aza-CdR处理能显著降低Dnmt3a的表达和Epo启动子高甲基化水平,并随之降低了肌成纤维细胞中α-SMA的表达及α-SMA与PDGFRβ的表达比例,同时,5-Aza-CdR处理提高了细胞上清液中EPO的水平。结论5-Aza-CdR可通过抑制大鼠原代肾肌成纤维细胞Epo启动子高甲基化逆转PMT。Objective To examine the effect of the demethylating agent 5-aza-2’-deoxycytidine(5-Aza-CdR)on pericyte-myofibroblast transition(PMT)in primary rat renal myofibroblasts.Methods Rat primary renal myofibroblasts were treated with 5-Aza-CdR 250 ng/mL for 72 h,and the degree of Epo promoter methylation was detected by pyrosequencing.Protein expression levels of α-smooth muscle actin(α-SMA),platelet-derived growth factor receptor-β(PDGFRβ)and DNA methyltransferase(Dnmt3a)were detected by immunofluorescence and Western blot,and erythropoietin(EPO)levels in the supernatant were detected.Results Compared with the control group,5-Aza-CdR treatment significantly decreased the expression of Dnmt3a and hypermethylation of the Epo promoter,and subsequently decreased the expression of α-SMA and the expression ratio ofα-SMA to PDGFRβ in myofibroblasts.Meanwhile,5-Aza-CdR treatment increased the level of EPO in the cell supernatant.Conclusions 5-Aza-CdR can reverse PMT by inhibiting Epo promoter hypermethylation in primary renal myofibroblasts.

关 键 词：周细胞-肌成纤维细胞转化 EPO DNA甲基化 5-氮杂-2’脱氧胞苷 DNA甲基转移酶 

分 类 号：R-33[医药卫生]