Journal
FEBS LETTERS
Volume 580, Issue 19, Pages 4625-4631Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2006.07.042
Keywords
cytokine; food intake; insulin; nitric oxide; nitric oxide synthase; tumor necrosis factor
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TNF-alpha acts on the hypothalamus modulating food intake and energy expenditure through mechanisms incompletely elucidated. Here, we explore the hypothesis that, to modulate insulin-induced anorexigenic signaling in hypothalamus, TNF-a requires the synthesis of NO. TNF-alpha activates signal transduction through JNK and p38 in hypothalamus, peaking at 10(-8) M. This is accompanied by the induction of expression of the inducible and neuronal forms of NOS, in both cases peaking at 10(-12) M. In addition, TNF-alpha stimulates NOS catalytic activity. Pre-treatment with TNF-alpha at a low dose (10(-12) M) inhibits insulin-dependent anorexigenic signaling, and this effect is abolished in iNOS but not in nNOS knockout mice. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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