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J. Biol. Chem., Vol. 277, Issue 25, 22131-22139, June 21, 2002
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§ and
From the Lipopolysaccharide (LPS) stimulates
macrophages to release inflammatory cytokines, interleukin-1
Faculty of Medical Technology, Institute of
Biotechnology in Medicine, National Yang-Ming University,
112 Taipei, Taiwan
(IL-1),
and tumor necrosis factor (TNF). LPS-induced TNF suppresses scavenger
receptor functions in macrophages (van Lenten, B. J., and
Fogelman, A. M. (1992) J. Immunol. 148, 112-116), which is regulated by TNF-mediated protein kinases (Hsu,
H. Y., and Twu, Y. C. (2000) J. Biol. Chem. 275, 41035-41048). To examine the molecular mechanism for LPS induction of IL-1 in macrophages, we demonstrated that LPS quickly stimulated reactive oxygen species (ROS), and 3 h later induced prointerleukin-1
(pro-IL-1, precursor of IL-1) production and IL-1
secretion. LPS stimulated pro-IL-1 message/protein between 3 and
10 h; however, there was a 40% reduction of pro-IL-1 in preincubation of the antioxidant, N-acetylcysteine (NAC).
Moreover, NAC moderated LPS-induced IL-1 secretion partially via
interleukin 1-converting enzyme. The maximal activity of LPS-induced
ERK, JNK, and p38 was 12- (30 min), 5- (30 min), and 16-fold (15 min), respectively. In contrast, NAC reduced ERK activity to 60% and decreased p38 activity to the basal level, but JNK activity was induced
2-fold. Furthermore, the pharmacological antagonists LY294002, SB203580, curcumin, calphostin C, and PD98059 revealed the diverse roles of LPS-mediated protein kinases in pro-IL-1. On the other hand,
NAC and diphenyleneiodonium chloride partially inhibited LPS-induced
Rac activity and protein-tyrosine kinase (PTK), indicating that
LPS-mediated ROS and NADPH oxidase correspond to Rac activation and
IL-1 expression. Our findings establish for the first time that
LPS-mediated PTK/phosphatidylinositol 3-kinase/Rac/p38 pathways play a
more important role than pathways of PTK/PKC/MEK/ERK and of
PTK/phosphatidylinositol 3-kinase/Rac/JNK in the regulation of
pro-IL-1/IL-1. The findings also further elucidate the critical role of
LPS-mediated ROS in signal transduction pathways. Our results suggest
that understanding LPS-transduced signals in IL-1 induction upon the
antibacterial action of macrophages should provide a therapeutic
strategy for aberrant inflammatory responses leading to severe cellular
injury or concurrent multiorgan septic damage.
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