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神经酰胺介导粒细胞凋亡机理初探 |
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辛宏 颜光涛 郝秀华 王录焕 李英丽
摘 要 目的:观察神经酰胺对HL-60及中性粒细胞(PMN)凋亡产生的影响,探讨其在粒细胞发生过程中可能的调节作用。方法:采用DNA凝胶电泳,流式细胞术,光镜及RT-PCR等技术对细胞进行凋亡鉴定及相关基因bcl-2, c-myc mRNA表达分析。结果:神经酰胺(C2 -ceramide), 肿瘤坏死因子(TNFα)及长春新碱(Vincristine)均可不同程度地诱导HL-60及成熟PMN产生凋亡, CPK激活剂PMA, Diacylglycerol无诱凋作用, 并对TNFα,C2-ceramide及Vincristine诱导的凋亡有不同程度的抑制;上述药物刺激后bcl-2, c-myc mRNA表达在HL-60细胞中呈明显下调趋势, c-myc mRNA表达在PMN中也呈轻度下调。结论: 神经酰胺可作为HL-60、PMN胞内介质参与凋亡信号的传导,且与CPK途径及bcl-2,c-myc基因表达相关。 关键词 细胞凋亡 神经酰胺 bcl-2基因 c-myc基因
中国图书分类号 R392.12
Induction of apoptosis by ceramide in human promyelocytic cells and its mechanism
XIN Hong, YAN Guang-Tao, HAO Xiu-Hua et al. Laboratory of Biochemistry, Basic Medical Center, General Hospital of PLA, Beijing 100853
Abstract Objective: To determine the effects of ceramide on apoptosis and regulation in granulocytes differentiation processes. Methods: DNA fragmentation, FACS , light microscope and RT-PCR were employed to determine the apoptosis and bcl-2,c-myc mRNA levels of granulocytes. Results: C2-ceramide, TNFα and Vincristine all resulted in a time and dose-dependent apoptosis of PMN and HL-60 cells.They also induced down-regulation of bcl-2,c-myc mRNA expressions in HL-60 cells and a light down-regulation of c-myc mRNA expression in PMN. A proper dose of phorbol ester (PMA) and diacylglycerol could not induce cell growth suppression but inhibite apoptosis induced by the drugs above. Conclusion: Ceramide was a mediator of apoptosis in PMN and HL-60 cell. The transduction of apoptotic signal was correlated with the CPK pathway,the down-regulation of bcl-2 and c-myc mRNA expression. Key words Apoptosis Ceramide bcl-2 c-myc gene
细胞凋亡(Apoptosis)是细胞生理性死亡过程,在维持机体内环境稳定,减少自身免疫及炎症反应中有重要作用。中性粒细胞(PMN)是炎症反应的重要标志, 在炎症的发生、发展和转归中起至关重要的作用。PMN的清除机制仍未明确,但近年来认为通过凋亡方式在膜完整状态下被巨噬细胞识别和清除[1],是维持机体正常数量PMN,进而限制细胞损伤,促进炎症吸收的重要机制。 神经酰胺,即N-脂酰鞘氨醇(Ceramide)是神经鞘磷脂(SM)主要的水解产物, 作为一个新的第二信使[1] [2] [3] 下一页 上一个医学论文: 可溶性HLA 下一个医学论文: 纵向生命质量资料分析的Markov过程法及其应用
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