The relationship between LPS-induced iNOS mRNA expression and macrophages cytotoxic function
- VernacularTitle:内毒素诱导巨噬细胞iNOS表达与抗肿瘤细胞毒作用的关系
- Author:
Bo XU
;
Jun YANG
- Publication Type:Journal Article
- Keywords:
macrophage;
lipopolysaccharide;
nitric oxide;
cytotoxic effects
- From:China Oncology
2001;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Purpose:To study LPS induced iNOS mRNA expression and NO production by murine peritoneal macrophages, and their relationship with cytotoxic function of activated macrophages.Methods:LPS induced iNOS mRNA expression, production of NO and effects of activated macrophages on anti tumor were investigated separately by RT PCR, nitrate reductase method and 3HTdR incorporation.Results:LPS can upregulates iNOS mRNA expression in a dose dependent manner. L NIL(specific inhibitors of iNOS) pretreatment significantly reduced cytotoxic effect on the proliferation of HL 60 cells, but had little effect on the K562 tumor target cells on condition that NO production is sufficiently inhibited. Conclusions:LPS can effectively induce iNOS mRNA expression and NO production in murine peritoneal macrophages. NO is one of the important effector molecules in unspecific immunity of activated macrophages, but it plays different roles in cytotoxic effects of macrophages on different target tumor cells.
