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B kinase
activity in lung epithelial cells
1 Department of Internal Medicine, Seoul National University College of Medicine, and 3 Lung Institute, Seoul National University Medical Research Center, Chongno-Gu, Seoul 110-799; and 2 Clinical Research Institute, Seoul National University Hospital, Chongno-Gu, Seoul 110-744, Korea
The anti-inflammatory effect of
acetylsalicylic acid (ASA) has been thought to be secondary to the
inhibition of prostaglandin synthesis. Because doses of ASA necessary
to treat chronic inflammatory diseases are much higher than those
needed to inhibit prostaglandin synthesis, a prostaglandin-independent
pathway has been emerging as the new anti-inflammatory mechanism of
ASA. Here, we examined the effect of ASA on the interleukin
(IL)-1
- and tumor necrosis factor (TNF)-
-induced
proinflammatory cytokine expression and evaluated whether this effect
is closely linked to the nuclear factor (NF)-
B/I
B-
pathway. A
high dose of ASA blocked IL-1
- and TNF-
-induced TNF-
and IL-8
expression, respectively. ASA inhibited TNF-
-induced activation of
NF-
B by preventing phosphorylation and subsequent degradation of
I
B-
in a prostanoid-independent manner. TNF-
-induced
activation of I
B kinase was also suppressed by ASA pretreatment.
These observations suggest that the anti-inflammatory effect of ASA in
lung epithelial cells may be due to suppression of I
B kinase
activity, which thereby inhibits subsequent phosphorylation and
degradation of I
B-
, activation of NF-
B, and proinflammatory cytokine expression in lung epithelial cells.
nuclear factor-
B; interleukin-8
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