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Research Article Free access | 10.1172/JCI116070

Regulation of insulin-like growth factor-I and its receptor in rat aorta after balloon denudation. Evidence for local bioactivity.

M J Khorsandi, J A Fagin, D Giannella-Neto, J S Forrester, and B Cercek

Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, California 90048-1896.

Find articles by Khorsandi, M. in: PubMed | Google Scholar

Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, California 90048-1896.

Find articles by Fagin, J. in: PubMed | Google Scholar

Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, California 90048-1896.

Find articles by Giannella-Neto, D. in: PubMed | Google Scholar

Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, California 90048-1896.

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Division of Cardiology, Cedars-Sinai Medical Center, Los Angeles, California 90048-1896.

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Published November 1, 1992 - More info

Published in Volume 90, Issue 5 on November 1, 1992
J Clin Invest. 1992;90(5):1926–1931. https://doi.org/10.1172/JCI116070.
© 1992 The American Society for Clinical Investigation
Published November 1, 1992 - Version history
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Abstract

Local production of growth factors may play a major role in vascular repair after injury. We examined the regulation of insulin-like growth factor-I (IGF-I) and its specific membrane receptor in balloon-denuded rat aorta. Aortic IGF-I mRNA and radioimmunoassayable IGF-I content increased severalfold after balloon denudation with a peak at 7 d after injury. This coincided with a reciprocal 25% decrease in IGF-I receptor mRNA content and a 40% decrease in total 125I-IGF-I binding. Scatchard analysis indicated a single class of binding sites, with a decrease in receptor number at 7 d compared to control and no change in affinity. By in situ hybridization the predominant site of IGF-I expression in the normal and the denuded vessel wall was the medial smooth muscle cell. After denudation there was a relative decrease in IGF-I receptor mRNA in the medial cells as compared to the neointima, suggesting that the site of IGF-I action was predominantly in the medial layer. These data suggest that local expression and action of IGF-I are significant in the promotion of smooth muscle cell proliferation after arterial injury.

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