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IGFBP3 suppresses retinopathy through suppression of oxygen-induced vessel loss and promotion of vascular regrowth

Journal article
Authors Chatarina Löfqvist
J. Chen
K. M. Connor
A. C. Smith
C. M. Aderman
N. Liu
J. E. Pintar
T. Ludwig
Ann Hellström
L. E. Smith
Published in Proc Natl Acad Sci U S A
Volume 104
Issue 25
Pages 10589-94
ISSN 0027-8424 (Print)
Publication year 2007
Published at Institute of Neuroscience and Physiology, Department of Clinical Neuroscience and Rehabilitation
Institute of Clinical Sciences
Pages 10589-94
Language en
Links internal-pdf://PNAS 07_104_10589-29...
Keywords Animals, Disease Models, Animal, Dose-Response Relationship, Drug, Gene Expression Regulation, Gestational Age, Humans, Hyperoxia/complications, Infant, Newborn, Infant, Premature, Insulin-Like Growth Factor Binding Protein 1/blood, Insulin-Like Growth Factor Binding Protein, 3/blood/*deficiency/genetics/pharmacology, Mice, Mice, Knockout, Mice, Transgenic, *Oxygen, RNA, Messenger/metabolism, Retina/cytology, Retinal Neovascularization/chemically induced/*metabolism, Retinopathy of, Prematurity/classification/etiology/*metabolism/pathology/physiopathology
Subject categories Medical and Health Sciences

Abstract

Vessel loss precipitates many diseases. In particular, vessel loss resulting in hypoxia induces retinal neovascularization in diabetic retinopathy and in retinopathy of prematurity (ROP), major causes of blindness. Here we define insulin-like growth factor binding protein-3 (IGFBP3) as a new modulator of vascular survival and regrowth in oxygen-induced retinopathy. In IGFBP3-deficient mice, there was a dose-dependent increase in oxygen-induced retinal vessel loss. Subsequent to oxygen-induced retinal vessel loss, Igfbp3(-/-) mice had a 31% decrease in retinal vessel regrowth versus controls after returning to room air. No difference in serum insulin-like growth factor 1 (IGF1) levels was observed among groups. Wild-type mice treated with exogenous IGFBP3 had a significant increase in vessel regrowth. This correlated with a 30% increase in endothelial progenitor cells in the retina at postnatal day 15, indicating that IGFBP3 could be serving as a progenitor cell chemoattractant. In a prospective clinical study, we measured IGFBP3 (and IGF1) plasma levels weekly and examined retinas in all premature infants born at gestational ages <32 weeks at high risk for ROP. The mean level of IGFBP3 at 30-35 weeks postmenstrual age (PMA) for infants with proliferative ROP (ROP stages 3>, n = 13) was 802 microg/liter, and for infants with no ROP (ROP stage 0, n = 38) the mean level was 974 microg/liter (P < 0.03). These results suggest that IGFBP3, acting independently of IGF1, helps to prevent oxygen-induced vessel loss and to promote vascular regrowth after vascular destruction in vivo in a dose-dependent manner, resulting in less retinal neovascularization.

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