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Critical contribution of KV1 channels to the regulation of coronary blood flow

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Abstract

Ion channels in smooth muscle control coronary vascular tone, but the identity of the potassium channels involved requires further investigation. The purpose of this study was to evaluate the functional role of KV1 channels on porcine coronary blood flow using the selective antagonist correolide. KV1 channel gene transcripts were found in porcine coronary arteries, with KCNA5 (encoding KV1.5) being most abundant (P < 0.001). Immunohistochemical staining demonstrated KV1.5 protein in the vascular smooth muscle layer of both porcine and human coronary arteries, including microvessels. Whole-cell patch-clamp experiments demonstrated significant correolide-sensitive (1–10 µM) current in coronary smooth muscle. In vivo studies included direct intracoronary infusion of vehicle or correolide into a pressure-clamped left anterior descending artery of healthy swine (n = 5 in each group) with simultaneous measurement of coronary blood flow. Intracoronary correolide (~0.3–3 µM targeted plasma concentration) had no effect on heart rate or systemic pressure, but reduced coronary blood flow in a dose-dependent manner (P < 0.05). Dobutamine (0.3–10 µg/kg/min) elicited coronary metabolic vasodilation and intracoronary correolide (3 µM) significantly reduced coronary blood flow at any given level of myocardial oxygen consumption (P < 0.001). Coronary artery occlusions (15 s) elicited reactive hyperemia and correolide (3 µM) reduced the flow volume repayment by approximately 30 % (P < 0.05). Taken together, these data support a major role for KV1 channels in modulating baseline coronary vascular tone and, perhaps, vasodilation in response to increased metabolism and transient ischemia.

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Acknowledgments

This study was supported by U01HL118738 (G. Kassab) and R01HL11760 (J. Tune). Dr. Goodwill was supported by the American Heart Association 13POST1681001813. Ms. Noblet and Mr. Sassoon were supported by TL1 TR000162 from the National Institutes of Health, National Center for Advancing Translational Sciences, Clinical and Translational Sciences Award.

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Authors and Affiliations

  1. Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, USA

    Adam G. Goodwill, Jillian N. Noblet, Daniel Sassoon, Luke Schepers, B. Paul Herring & Johnathan D. Tune

  2. California Medical Innovations Institute, 11107 Roselle Street, San Diego, CA, 92121, USA

    Lijuan Fu, Ghassan S. Kassab & Gregory M. Dick

  3. Department of Physiology, West Virginia University School of Medicine, Morgantown, USA

    Trey S. Rottgen

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  1. Adam G. Goodwill
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Correspondence to Gregory M. Dick.

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Goodwill, A.G., Noblet, J.N., Sassoon, D. et al. Critical contribution of KV1 channels to the regulation of coronary blood flow. Basic Res Cardiol 111, 56 (2016). https://doi.org/10.1007/s00395-016-0575-0

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