Analysis of Angiogenesis Induced by Local IGF-1 Expression After Myocardial Infarction Using MicroSPECT-CT Imaging

Overview

Journal J Mol Cell Cardiol

Specialty Cardiology & Vascular Diseases

Date 2009 Oct 24

PMID 19850049

Citations 40

Authors

Lawrence W Dobrucki

Yoshiaki Tsutsumi

Leszek Kalinowski

Jarrod Dean

Mary Gavin

Sabyasachi Sen

Marivi Mendizabal

Albert J Sinusas

Ryuichi Aikawa

Affiliations

Soon will be listed here.

Abstract

Insulin-like growth factor-1 (IGF-1) has been found to exert favorable effects on angiogenesis in prior animal studies. This study explored the long-term effect of IGF-1 on angiogenesis using microSPECT-CT in infarcted rat hearts after delivering human IGF-1 gene by adeno-associated virus (AAV). Myocardial infarction (MI) was induced in Sprague-Dawley rats by ligation of the proximal anterior coronary artery and a total of 10(11) AAV-CMV-lacZ (control) or IGF-1 vectors were injected around the peri-infarct area. IGF-1 expression by AAV stably transduced heart muscle for up to 16 weeks post-MI and immunohistochemistry revealed a remarkable increase in capillary density. A (99m)Tc-labeled RGD peptide (NC100692, GE Healthcare) was used to assess temporal and regional alpha(v) integrin activation. Rats were injected with NC100692 followed by (201)Tl chloride and in vivo microSPECT-CT imaging was performed. After imaging, hearts were excised and cut for quantitative gamma-well counting (GWC). NC100692 retention was significantly increased in hypoperfused regions of both lacZ and IGF-1 rats at 4 and 16 weeks post-MI. Significantly higher activation of alpha(v) integrin was observed in IGF-1 rats at 4 weeks after treatment compared with control group, although the activation was lower in the IGF-1 group at 16 weeks. Local IGF-1 gene delivery by AAV can render a sustained transduction and improve cardiac function post-MI. IGF-1 expression contributes to enhanced alpha(v) integrin activation which is linked to angiogenesis. MicroSPECT-CT imaging with (99m)Tc-NC100692 and quantitative GWC successfully assessed differences in alpha(v) integrin activation between IGF-1-treated and control animals post-MI.

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