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Karger Publishers, Journal of Vascular Research, 2(41), p. 174-182, 2004

DOI: 10.1159/000077288

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Activation of Resistance Arteries with Endothelin-1: From Vasoconstriction to Functional Adaptation and Remodeling

Journal article published in 2004 by Erik N. T. P. Bakker ORCID, Carsten L. Buus, Ed VanBavel, Michael J. Mulvany
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Remodeling of resistance arteries is a key feature in hypertension. We studied the transition of vasoconstriction to remodeling in isolated rat skeletal muscle arterioles. Arterioles activated with 10 n<i>M</i> endothelin-1 showed functional adaptation when kept at low distension in a wire myograph setup, where contractile properties shifted towards a smaller lumen diameter after 1 day. Pressurized arteries kept in organoid culture showed physical inward remodeling after 3-day activation with 10 n<i>M</i> endothelin-1, characterized by a reduction in relaxed diameter without a change in the wall cross-sectional area (eutrophic remodeling). The relaxed lumen diameter (at 60 mm Hg) decreased from 169 ± 5 (day 0) to 155 ± 4 µm (day 3). An antibody directed to the β<sub>3</sub>-integrin subunit (but not one directed to the β<sub>1</sub>-integrin subunit) enhanced remodeling, from a reduction in relaxed diameter at 60 mm Hg of 15 ± 2.4 to 22 ± 1.8 µm (both on day 3). Collagen gel contraction experiments showed that the antibody directed to the β<sub>3</sub>-integrin subunit enhanced the compaction of collagen by smooth muscle cells, from 83 ± 1.5 to 68 ± 1.5% of the initial gel diameter. In conclusion, these data show that inward eutrophic remodeling is a response to sustained contraction, which may involve collagen reorganization through β<sub>3</sub>-integrins.