基于细胞生物学方法比较5种不同组织来源间充质干细胞的特征

背景:间充质干细胞的来源以及分离方法越来越多样,充分认识到这些间充质干细胞的异同,将有助于间充质干细胞在临床中更加合理规范的应用。目的:比较不同组织来源间充质干细胞的生物学特征。方法:采集剖宫产产妇在生育后脱落的脐带、胎盘以及部分脂肪组织,采用胰酶消化法或组织块贴壁法培养出底蜕膜间充质干细胞、绒毛膜间充质干细胞、脂肪间充质干细胞、脐带胎盘连接处间充质干细胞、脐带间充质干细胞,所用的干细胞培养基有3 种:含胎牛血清的干细胞培养基、含脐血裂解物的干细胞培养基、含无血清添加物的干细胞培养基。检测不同培养条件下的细胞直径、表面标志物以及多向分化能力,检索GEO数据库分析不同间充质干细胞的基因表达情况。结果与结论:①不同培养条件影响细胞大小和细胞周期,其中无血清培养体系培养的间充质干细胞直径偏小,而脐血裂解物干细胞培养基能够增加胎盘源间充质干细胞的直径;②5 种间充质干细胞有类似的表面标志物,都具有成骨、成软骨和成脂肪分化能力,其中脂肪间充质干细胞成脂肪分化能力更强;③脂肪间充质干细胞相比于与其他4 种干细胞在基因表达上存在较大差异,具有更复杂细胞基质成分。

Dimethylarsenic acid damages cellular DNA and inhibits gap junctional intercellular communication between human skin fibroblast cells

Although arsenic is identified as a human carcinogen,there is currently no accepted mechanism for its action or an established animal model for evaluating the carcinogenic activity of arsenic.To elucidate the mechanism of arsenic arcinogenesis,we investigated the effect of dimethylarsenic acid(DMAA),the main metabolite of inorganic arsenic in humans,on the cellular DNA and gap junctional intercellular communication (GJIC) between human skin fibroblast cells.Single-cell gel electrophoresis (SCGE) assay was used to detect the DNA damage in human skin fibroblast cells exposed to DMAA,and the GJIC between cells was detected by the scrape loading/dye transfer assay.DMAA at concentrations of 0.01-1.0 mmol·L^-1 induced DNA damage in a dose-dependent manner,and GJIC between human skin fibroblast cells was significantly inhibited by DMAA at 1.0 mmol·L^-1.Our results suggest that both genotoxic and nongenotoxic mechanism are involved in the mechanism of DMAA-induced cellular toxicity.