Rapid Insulin-like Growth Factor (IGF)-independent Effects of IGF Binding Protein-3 on Endothelial Cell Survival

Overview

Journal J Clin Endocrinol Metab

Publisher Oxford University Press

Specialty Endocrinology

Date 2003 Feb 8

PMID 12574231

Citations 25

Authors

Sherry Lynn Franklin

Robert J Ferry Jr

Pinchas Cohen

Affiliations

Soon will be listed here.

Abstract

Angiogenic factors, such as vascular endothelial-derived growth factor (VEGF) and IGF-I, play pivotal roles in endothelial proliferation and migration. IGF binding protein-3 (IGFBP-3) is emerging as a key regulator of cell growth and apoptosis, both as an IGF antagonist and as an independent molecule. We investigated the role of IGFBP-3 in VEGFmediated survival of human macrovascular umbilical vein endothelial cells (HUVEC). Specific commercial ELISAs quantified cell proliferation and apoptosis, and Akt phosphorylation was assessed by immunoblots and confocal microscopy. IGF-I and VEGF significantly stimulated HUVEC proliferation and survival. Addition of IGFBP-3 reversed both IGF- and VEGF-induced proliferation and prevented the survival induced by these factors. The antiproliferative and proapoptotic effects of exogenous IGFBP-3 upon VEGF-induced HUVEC survival were not inhibited by blockade of the type 1 IGF receptor with alpha IR-3 immunoglobulin, which fully prevented IGF actions. An IGFBP-3 mutant, which binds IGFs normally but has a substituted mid-region domain, lost the ability to inhibit VEGF actions. VEGF-induced phosphorylation of Akt, as evident by both specific immunoblots and confocal microscopy, was significantly and rapidly reduced in the presence of IGFBP-3, as well as wortmannin.

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