Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 324, Issue 4, Pages 1204-1209Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2004.09.177
Keywords
AMP-activated protein kinase; free fatty acids; human umbilical vein endothelial cells; nuclear factor kappa-B; tumor necrosis factor-alpha; atherosclerosis; inflammation
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Funding
- NHLBI NIH HHS [P01 HL 68758-01A1] Funding Source: Medline
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The fuel sensing enzyme AMP-activated protein kinase (AMPK) enhances processes that generate ATP when stresses such as exercise or glucose deprivation make cells energy deficient. We report here a novel role of AMPK, to prevent the activation of NF-kappaB in endothelial cells exposed to the fatty acid palmitate or the cytokine TNF-alpha. Incubation of cultured human umbilical vein endothelial cells (HUVEC) with elevated levels of palmitate (0.4 mM) increased NF-kappaB reporter gene expression by 2- to 4-fold within 8 h and caused a 7-fold increase in VCAM-1 mRNA expression at 24 h. In contrast, no increase in reporter gene expression was detected for AP-1, glucocorticoid-, cyclic AMP-, or serum response elements. Similar increases in NF-kappaB activation and VCAM-1 expression were not observed in cells incubated with an elevated concentration of glucose (25 mM). The increases in NF-kappaB activation and VCAM-1 expression caused by palmitate were markedly inhibited by co-incubation with the AMPK activator AICAR and, where studied, by expression of a constitutively active AMPK. Likewise, AMPK activation inhibited the increase in NF-kappaB reporter gene expression observed in HUVEC incubated with TNF-alpha. The results suggest that AMPK inhibits the activation of NF-kappaB caused by both palmitate and TNF-alpha. The mechanism responsible for this action, as well as its relevance to the reported anti-atherogenic actions of exercise, metformin, thiazolidinediones, and adiponectin, all of which have been shown to activate AMPK, remains to be determined. (C) 2004 Elsevier Inc. All rights reserved.
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