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In Vitro
Journal Article
Tolerance and sensitization to endotoxin in Kupffer cells caused by acute ethanol involve interleukin-1 receptor-associated kinase.
Biochemical and Biophysical Research Communications 2000 November 3
Ethanol changes sensitivity of Kupffer cells to endotoxin. Here, the hypothesis that interleukin-1 receptor-associated kinase (IRAK), a downstream signaling molecule of toll-like receptors, regulates the response to LPS in Kupffer cells after ethanol treatment was evaluated. C57BL/6 mice were given ethanol intragastrically, and LPS was injected 1 or 21 h later. One hour after ethanol treatment, serum transaminases after LPS were 60% of control, while ethanol increased these parameters about 3-fold 21 h after ethanol. Pretreatment with antibiotics blocked these effects of ethanol. In Kupffer cells from mice treated with ethanol 1 h earlier, LPS-induced TNFalpha production, and IRAK expression and activity and NFkappaB were decreased 50-60% of control. In contrast, in Kupffer cells from mice treated with ethanol 21 h earlier, LPS-induced TNFalpha production, expression and activity of IRAK were increased 1.5-fold over controls, while NFkappaB was elevated 3-fold. These data indicate that ethanol-induced tolerance and sensitization of Kupffer cells to endotoxin in mice involve IRAK.
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