LPS induced macrophage priming effect on O_2~ production and its signal mechanisms / 中国病理生理杂志
Chinese Journal of Pathophysiology
;
(12)2000.
Article
in Chinese
| WPRIM
| ID: wpr-521051
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 .
Full text:
Available
Index:
WPRIM (Western Pacific)
Language:
Chinese
Journal:
Chinese Journal of Pathophysiology
Year:
2000
Type:
Article
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