内皮型一氧化氮合酶基因转染对人吞噬细胞释放细胞因子和生成环核苷酸的影响

目的和方法:将内皮型一氧化氮合酶基因转染吞噬细胞,观察该基因表达对吞噬细胞释放细胞因子和cAMP的影响。 结果:内皮型一氧化氮合酶可在吞噬细胞获得稳定表达,但该产物在活细胞中不产生一氧化氮。一氧化氮合酶基因表达可上调TNF-α的释放,下调IL-10和cAMP的生成,使用一氧化氮合酶抑制剂不改变这种变化趋势。结论:内皮型一氧化氮合酶基因产物的功能具有细胞特异性。导致吞噬细胞功能变化的效应分子可能不是一氧化氮。

Effects of endothelial nitric oxide synthase gene transfection on cytokines and cAMP production in human phagocytic cells

AIM and METHOD: Human endothelial nitric oxide synthase (eNOS) gene was transfected into human phagocytic cell U937 and the effects of gene transfer on cytokines and cAMP production were observed. RESULTS: A functional eNOS was stably expressed in transfected U937 cells, but NO release was undetectable in intact transfectants. However, eNOS gene expression upregulated tumor necrosis factor-α release and downregulated interleukin-10 and cAMP production in either presence or absence of NOS inhibitor N^ω-monomethyl-L-arginine. CONCLUSION: The function of tranfected eNOS gene product showed cellular speciality. The effector molecule that changed the produced pattern of cytokines and cAMP in phagocytic cells seems not likely the nitric oxide.