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American Journal of Pathology, Vol 137, 313-330, Copyright © 1990 by American Society for Investigative Pathology
REGULAR ARTICLES |
AD Snow, RP Bolender, TN Wight and AW Clowes
Department of Pathology, University of Washington, Seattle 98195.
Heparin and related molecules influence vascular wall structure by their ability to inhibit smooth muscle cell (smc) proliferation and migration. However, little is known as to whether heparin has an effect on the extracellular matrix. In the present study, the effect of heparin on the content and regional distribution of elastin, collagen, and proteoglycans (PGs) in blood vessels following experimental injury was determined. Two groups of rats were subjected to left common carotid balloon injury and were infused with either 0.9% saline or heparin in a saline solution, for 2 weeks. Using a new morphometric method of analysis, the authors determined changes in volumes of elastin, collagen, and PGs contained within an 'extracellular matrix domain (ECM domain),' the average envelope of connective tissue surrounding each smc. Heparin treatment inhibited intimal thickening and decreased the elastin content in the ECM domain in the upper and lower arterial intima. Collagen also was found to be significantly decreased 5.0-fold and 7.6-fold in the ECM domains of upper and lower intima, respectively, of heparin-treated animals. The decrease in both elastin and collagen was balanced by a significant increase in amorphous and filamentous electron-dense material. Heparin also caused a significant 1.8-fold and 1.9-fold increase in the PG content in the ECM domain in the upper and lower intima, respectively. Immunohistochemical analysis, using antibodies to elastin and PG subclasses, supported the morphometric observations. This study has shown that heparin administered in vivo can alter the accumulation and distribution of each of the major vascular ECM components in a specific and differential manner.
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