外源核苷酸对IEC-6细胞凋亡的影响

Effects of exogenerous nucleotides on the apoptosis ofintestinal epithelial cells IEC-6

目的探讨外源核苷酸对正常肠上皮细胞系IEC6凋亡的作用。方法体外培养的IEC6细胞经4种单核苷酸及按母乳组成模式配制的核苷酸混合物处理,然后采用流式细胞术、电子显微镜等方法观测细胞凋亡。结果流式细胞检测表明嘌呤核苷酸AMP和GMP均能诱导细胞凋亡,但电子显微镜观察发现仅有AMP诱导典型的细胞凋亡特征。嘧啶核苷酸和核苷酸混合物不诱导细胞凋亡,而且嘧啶核苷酸UMP能解除嘌呤核苷酸诱导细胞凋亡的作用。结论嘌呤核苷酸可诱导肠上皮细胞凋亡,嘧啶核苷酸UMP可解除嘌呤核苷酸的凋亡诱导作用。

Objective To investigate the effects of exogenous nucleotides on apoptosis of a normal rat small intestinal epithelial cell line, IEC-6. Methods Cultured IEC-6 cells were treated by four kinds of monophosphate nucleotides and their mixture prepared according to their composition in human milk, then the cell apoptosis was determined by flow cytometry measurement, morphologic characterization, and electron-microscope observation. Results IEC-6 cells treated with AMP or GMP showed a apotosis peak in flow cytometry measurement, but only AMP produce typical apoptosis characteristics in electron-microscope observation. Pyrimidine nucleotides （UMP and CMP）and nucleotides mixture could not induce apoptosis. However, UMP could significantly eliminate the apoptosis-inducing effects of AMP or GMP. Conclusion Purine nucleotides induce apoptosis of IEC-6, pyrimidine nucleotides UMP could abolish the apoptosisinducing effects of purine nucleotides.