Free radical-mediated transgene inactivation of macrophages by endotoxin.
Free radical-mediated transgene inactivation of macrophages by endotoxin.
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自由基介导的转基因内毒素对巨噬细胞的灭活。
DOI:
10.1152/ajplung.2000.279.5.l878
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
Rojanasakul,Y
中科院分区:
文献类型:
--
作者:
Dokka,S;Toledo,D;Wang,L;Shi,X;Huang,C;Leonard,S;Rojanasakul,Y
Endotoxin, the lipopolysaccharide component of gram-negative bacteria, is a common contaminant of plasmid DNA preparations. The present study investigated the effect of endotoxin on gene transfection efficiency and the role of reactive oxygen species (ROS) in this process. Gene transfection studies were performed in various cell types with cytomegalovirus-luciferase as a reporter plasmid and cationic liposome as a transfecting agent. The presence of endotoxin in plasmid DNA preparations severely limited transgene expression in macrophages but had little or no effect in other cell types tested. This decreased transfection was dependent on ROS-mediated cellular toxicity induced by endotoxin. Neutralizing the endotoxin by the addition of polymyxin B effectively increased transfection efficiency and reduced toxicity. Electron spin resonance studies confirmed the formation of ROS in endotoxin-treated cells and their inhibition by free radical scavengers. The ROS scavengerN-t-butyl-α-phenylnitrone, the H2O2scavenger catalase, and the ·OH scavenger sodium formate effectively inhibited endotoxin-induced effects, whereas the O2−scavenger superoxide dismutase had lesser effects. These results indicate that multiple oxidative species are involved in the transfection inactivation process and that ·OH formed by H2O2-dependent, metal-catalyzed Fenton reaction play a major role in this process.
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影响因子:
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作者:
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