PTPRD去甲基化通过PI3K/Akt/mTOR通路调控胃癌细胞的增殖、迁移及化疗耐药性  

PTPRD demethylation regulates the proliferation,migration,and chemoresistance of gastric cancer cells through the PI3K/Akt/mTOR pathway

作　　者：刘妍慧 高紫玉 任鹏 杜予馨 刘彩霞[1] 邢智伟[1] LIU Yanhui;GAO Ziyu;REN Peng;DU Yuxin;LIU Caixia;XING Zhiwei(Department of Oncology,Affiliated Hospital,Inner Mongolia Medical University,Hohhot 010050,Inner Mongolia,China;Graduate School,Inner Mongolia Medical University,Hohhot 010050,Inner Mongolia,China)

机构地区：[1]内蒙古医科大学附属医院肿瘤内科,内蒙古呼和浩特010050 [2]内蒙古医科大学研究生院,内蒙古呼和浩特010050

出　　处：《中国肿瘤生物治疗杂志》2025年第1期48-55,共8页Chinese Journal of Cancer Biotherapy

基　　金：内蒙古自治区科技计划项目(No.2020GG0171);内蒙古自治区高等学校科学研究项目(No.NJZZ23013)。

摘　　要：目的:探究蛋白酪氨酸磷酸酶D(PTPRD)去甲基化通过PI3K/Akt/mTOR通路对胃癌细胞增殖、迁移及化疗耐药性的影响。方法:体外培养胃癌细胞MKN-74、MKN-45和人胃黏膜上皮细胞GES-1并检测PTPRD表达。常规培养MKN-45细胞及耐药MKN-45/5-FU细胞,分别转染PTPRD空载体(NC组、NC/5-FU组)、PTPRD过表达腺病毒(PTPRD组、PTPRD/5-FU组)、shRNA空载体(sh-NC组、sh-NC/5-FU组)、shRNA-PTPRD慢病毒(sh-PTPRD组、sh-PTPRD/5-FU组)和PTPRD过表达腺病毒+10μmol/L 740Y-P处理(PTPRD+740Y-P组、PTPRD+740Y-P/5-FU组)。MTT法、划痕愈合实验检测各组细胞的增殖活力和迁移能力,细胞自噬实验检测细胞的自噬水平,WB法检测细胞中EMT和PI3K/Akt/mTOR通路相关蛋白的表达。采用0、2.5、5、10、20、40μmol/L的5-aza处理MKN-45细胞,qPCR法、MTT法检测细胞中PTPRD mRNA表达和细胞增殖活力。结果:PTPRD mRNA和蛋白在胃癌细胞中均呈低表达(P<0.05)。与MKN-45组相比,PTPRD组自噬体与自噬溶酶体数量、PTPRD、上皮钙黏素(E-cadherin)、BAX蛋白表达均增加(均P<0.05),细胞增殖活力、细胞迁移率、p-PI3K、波形蛋白(vimentin)、p-Akt、p-mTOR蛋白表达均降低(均P<0.05),sh-PTPRD组细胞增殖活力、细胞迁移率、p-PI3K、vimentin、p-Akt、p-mTOR蛋白表达均增加(均P<0.05),自噬体与自噬溶酶体数量、PTPRD、E-cadherin、BAX蛋白表达均减少(均P<0.05);与PTPRD组相比,PTPRD+740Y-P组细胞增殖活力、细胞迁移率、p-PI3K、vimentin、p-Akt、p-mTOR蛋白表达均增加(均P<0.05),自噬体与自噬溶酶体数量、PTPRD、E-cadherin、BAX蛋白表达减少(均P<0.05)。随着5-aza浓度的增加,MKN-45细胞中PTPRD mRNA表达增加、细胞增殖活力均降低(均P<0.05)。与MKN-45/5-FU组相比,PTPRD/5-FU组细胞迁移率、细胞增殖活力均降低(均P<0.05),sh-PTPRD/5-FU组细胞迁移率、细胞增殖活力均增加(均P<0.05);与PTPRD/5-FU组相比,PTPRD+740Y-P/5-FU组细胞迁移率、细胞增殖活力均增加(均P<0Objective:To investigate the effect of protein tyrosine phosphatase D(PTPRD)demethylation on the proliferation,migration,and chemoresistance of gastric cancer(GC)cells through the phosphatidyl inositol 3 kinase/protein kinase B/mammalian target of rapamycin(PI3K/Akt/mTOR)pathway.Methods:The gastric cancer MKN-74 and MKN-45 cells,as well as human gastric mucosal epithelial GES-1 cells,GES-1 were cultured in vitro and PTPRD expression was detected.MKN-45 cells and their drug-resistant variant MKN-45/5-FU cells were routinely cultured and transfected with various vectors:PTPRD empty vector(NC group,NC/5-FU group),PTPRD overexpressing adenovirus(PTPRD group,PTPRD/5-FU group),shRNA empty vector(sh-NC group,sh-NC/5-FU group),shRNA PTPRD lentivirus(sh-PTPRD group,sh-PTPRD/5-FU group),and PTPRD overexpressing adenovirus+10μmol/L 740Y-P treatment(PTPRD+740Y-P group,PTPRD+740Y-P/5-FU group).MTT assay and wound healing assay were used to assess cell proliferation and migration.Cell autophagy levels were assessed using autophagy assay,and the expression of epithelial-mesenchymal transition(EMT)and PI3K/Akt/mTOR pathway related proteins was detected using western blot(WB).MKN-45 cells were treated with 0,2.5,5,10,20 and 40μmol/L 5-aza solutions,and the PTPRD mRNA expression and cell proliferation in MKN-45 cells were detected using qPCR and MTT assays.Results:PTPRD mRNA and protein were significantly downregulated in gastric cancer cells(P<0.05).Compared with the MKN-45 group,the numbers of autophagosomes and autophagosomes,as well as the protein expression of PTPRD,E-cadherin,and BAX significantly increased in the PTPRD group(all P<0.05),while cell proliferation,migration rate,and protein expression of p-PI3K,vimentin,p-Akt,and p-mTOR decreased significantly(all P<0.05);However,in the sh-PTPRD group,cell proliferation activity,migration rate,and protein expression of p-PI3K,vimentin,p-Akt,and p-mTOR increased notably,while the quantity of autophagosomes,autophagosomes,and protein expression of PTPRD,E-cadherin,and BAX decr

关 键 词：蛋白酪氨酸磷酸酶D 胃癌 增殖 迁移 PI3K/Akt/mTOR通路 化疗耐药性 甲基化 

分 类 号：R735.2[医药卫生—肿瘤] R730.53[医药卫生—临床医学]