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Mol. Cell. Biol., Jan 1998, 78-84, Vol 18, No. 1
P Schwenger, D Alpert, EY Skolnik and J Vilcek
Many actions of the proinflammatory cytokines tumor necrosis factor (TNF)
and interleukin-1 (IL-1) on gene expression are mediated by the
transcription factor NF-kappaB. Activation of NF-kappaB by TNF and IL-1 is
initiated by the phosphorylation of the inhibitory subunit, IkappaB, which
targets IkappaB for degradation and leads to the release of active
NF-kappaB. The nonsteroidal anti-inflammatory drug sodium salicylate
(NaSal) interferes with TNF-induced NF-kappaB activation by inhibiting
phosphorylation and subsequent degradation of the IkappaB alpha protein.
Recent evidence indicated that NaSal activates the p38 mitogen-activated
protein kinase (MAPK), raising the possibility that inhibition of NF-kappaB
activation by NaSal is mediated by p38 MAPK. We now show that inhibition of
TNF-induced IkappaB alpha phosphorylation and degradation by NaSal is
prevented by treatment of cells with SB203580, a highly specific p38 MAPK
inhibitor. Both p38 activation and inhibition of TNF-induced IkappaB alpha
degradation were seen after only 30 s to 1 min of NaSal treatment.
Induction of p38 MAPK activation and inhibition of TNF-induced IkappaB
alpha degradation were demonstrated with pharmacologically achievable doses
of NaSal. These findings provide evidence for a role of NaSal-induced p38
MAPK activation in the inhibition of TNF signaling and suggest a possible
role for the p38 MAPK in the anti-inflammatory actions of salicylates. In
addition, these results implicate the p38 MAPK as a possible negative
regulator of TNF signaling that leads to NF-kappaB activation.
Copyright © 1998, American Society for Microbiology
Activation of p38 mitogen-activated protein kinase by sodium salicylate leads to inhibition of tumor necrosis factor-induced IkappaB alpha phosphorylation and degradation
Department of Microbiology, Skirball Institute for Biomolecular Medicine, NYU Medical Center, New York 10016, USA.
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