Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 342, Issue 4, Pages 1197-1202Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2006.02.088
Keywords
insulin; AMP-activated protein kinase; hypoxia-inducible factor-1; insulin like growth factor-1
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Insulin, insulin like growth factor (IGF)-1 and AMP-activated protein kinase (AMPK) signaling regulate independently angiogenesis through vascular endothelial growth factor (VEGF) expression. In the present study, we investigated a potential cross-talk between these signaling pathways on hypoxia-inducible factor (HIF)-1 alpha and VEGF expression. Retinal epithelial ARPE-19 cells were treated with AICAR, an AMPK activator, alone or in combination with insulin and IGF-1. AICAR stimulated VEGF mRNA expression, but did not modify the insulin- and IGIF-1-induced VEGF expression. We have investigated the effect of AICAR on insulin and IGF-1 signaling pathways. We observed that AICAR increased insulin- and IGIF-1-induced phosphorylation of PKB, whereas phosphorylation of S6K-1 was decreased. Moreover, AICAR and metformin inhibited the ability Of insulin and IGF-1 to induce HIF-1 alpha expression. These results show that AICAR and insulin/IGF-1 regulate VEGF expression through different mechanisms. (c) 2006 Elsevier Inc. All rights reserved.
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