LPS induced macrophage priming effect on O_2~ production and its signal mechanisms
- VernacularTitle:LPS致敏巨噬细胞产生O_2~及其信号机制
- Author:
Hui LIU
;
Xiaoyan ZHU
;
Haifeng JI
;
Weimin SUN
;
Renba XU
- Publication Type:Journal Article
- Keywords:
Lipopolysaccharides;
Macrophages;
Superoxides;
Calcium
- From:
Chinese Journal of Pathophysiology
2000;0(07):-
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To investigate the effect of lipopolysaccharide (LPS) priming on macrophage(M?). METHODS: Macrophage cell line RAW264.7 were pretreated with or without LPS for 1 h, then challenged with PMA, or LPS, muramyl dipeptide(MDP), Zymosan, formyl-methionyl-leucyl-phenylalanine(FMLP) for 1 h . O 2 production in supernatants and intracellular free calcium([Ca 2+ ]i ) were measured, and changes in [Ca 2+ ]i and LPS induced O 2 production were compared. RESULTS: LPS pretreatment significantly increased O 2 production in RAW264.7 cells challenged with the stimuli, and in a certain extent, both O 2 production and increase of resting intracellular [Ca 2+ ]i were dose- and time-dependent on LPS pretreatment.Furthermore,the peak [Ca 2+ ]i was significantly higher in LPS pretreated groups than that of LPS unpretreated groups when challenged with PMA. Pretreatment with Ca 2+ inophore A23187 mimicked the LPS priming effects on O 2 production, but pretreatment with Ca 2+ chelator BAPTA and EGTA blocked this priming effect. CONCLUSION: LPS induced M? priming effect on O 2 production is dependent on elevation of resting intracellular [Ca 2+ ]i .
