O-GlcNAc糖基化修饰和Akt1对胃癌细胞体外增殖及侵袭力的影响

目的 探讨O-连接N-乙酰氨基葡萄糖(O-GlcNAc)糖基化修饰对胃癌细胞体外增殖及侵袭力的影响,并评价Akt1在O-GlcNAc糖基化促进胃癌细胞体外增殖及侵袭过程中的作用.方法 通过使O-GlcNAc转移酶(OGT)过表达(过表达OGT组)或沉默表达(沉默OGT组)及使用O-GlcNAc水解酶(OGA)特异性抑制剂Thiamet-G(抑制剂组)下调O-GlcNAc水解酶活性(抑制剂组)等构建O-GlcNAc糖基化水平升高或降低的细胞模型;采用MTT法检测各组胃癌细胞增殖活力;软琼脂集落形成实验观察各组胃癌细胞集落形成;Transwell细胞迁移实验各组胃癌细胞体外迁移和侵袭能力;蛋白免疫印迹法(Western blot)检测各组胃癌细胞Akt1活性;Thiamet-G处理Akt1表达沉默(沉默Akt1组)的胃癌细胞以评价Akt1在O-GlcNAc糖基化促进胃癌细胞侵袭中的作用;利用Thiamet-G处理Akt1过表达(过表达Akt1组)的胃癌细胞以进一步验证Akt1在O-GlcNAc糖基化调控胃癌细胞侵袭性过程中的作用.结果 O-GlcNAc糖基化水平升高可促进胃癌细胞增殖并显著提高细胞集落形成、体外迁移和侵袭的能力;Akt1活性被由O-GlcNAc糖基化水平升高所介导的Ser473磷酸化上调而激活;Thiamet-G诱导的细胞侵袭性被Akt1 shRNA所抑制;Akt1高表达可进一步促进由Thiamet-G诱导的细胞侵袭性增强.结论 O-GlcNAc糖基化可部分通过Akt1途径增强胃癌细胞的体外增殖及侵袭力.

Effects of O-GlcNAcylation modification and Akt1 on proliferation and invasion of gastric cancer cells

Objective To study the influence of O-GlcNAcylation on on proliferation and invasion of gastric cancer cells and evaluate the role of Aktl on O-GlcNAcylation promotting cells proliferation and invasion in gastric cancer.Methods Build the cell model:O-GlcNAc glycosylation levels rise or fall.The cell viability was determine by MTT.To investigate whether O-GlcNAcylation affected colony formation ability of gastric cancer cells,soft agar colony assays were carried out.Cell migration or invasion was using transwell chambers.The expression of Akt1 was detected through Western blot.Thiamet-G was used to eualuate the role of Akt1 on O-Gcnac cylation regulating invasion in gastric Cancei.Results O-GlcNAcylation was increased the gastric cancer cells proliferation ability,colony formation ability,migration and invasion ability in vitro.Akt1 was activated by Ser473 phosphorylation upregulation though O-GlcNAcylation.Akt1 shRNA was inhibition the cell invasive which induced by Thiamet-G.Akt1 overexpression was promoted by Thiamet-G-induced cell invasion.Conclusion O-GlcNAcylation enhanced oncogenic phenotypes possibly partially involving Akt1.