Caco-2细胞缺氧复氧损伤后二肽载体表达及生物学功能的改变
Changes of Expression and Functions of Dipeptide Transporter after Anoxia/reoxygenation in Caco-2 Cells
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摘要: 目的:探讨Caco-2细胞缺氧复氧(anoxia/reoxygenation,A/R)损伤后二肽载体表达及生物学功能的变化。方法:采用Caco-2细胞A/R方法,模拟临床缺血再灌注(ischemia/reperfusion injury,I/R)。Caco-2细胞正常培养和A/R后(缺氧90min,复氧30min)后,测定二肽载体对头孢氨苄的摄取功能;采用流式细胞术观察损伤后Caco-2细胞的凋亡情况;员时比较两种培养情况下二肽载体的mRNA水平。结果:A/R后二肽载体对头孢氨苄的摄取能力下降;损伤后Caco-2细胞凋亡水平较正常细胞明显提高;Northern blotting显示损伤后二肽载体mRNA水平下调。结论:A/R后Caco-2细胞二肽载体mRNA下降从基因水平下调了二肽载体对头孢氨苄的摄取功能。提示Caco-2细胞A/R或临床I/R后肠上皮细胞刷状缘二肽载体对二肽的摄取功能下降。Abstract: AIM:To determine the changes of biological functions and expression of dipeptide transporter in Caco 2 cells with anoxia/reoxygenation(A/R) injury. METHOD:The human adenocarcinoma cell line Caco 2 cells were as the in vitro model of human small inte