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Article
Role of phosphodiesterases in modulation of BKCa channels in hypertensive pulmonary arterial smooth muscle
Therapeutic Advances in Respiratory Disease
  • Shu Zhu, Philadelphia College of Osteopathic Medicine
  • Richard E. White
  • Scott A. Barman
Document Type
Article
Publication Date
1-1-2008
Abstract
BKCa channels regulate pulmonary arterial pressure, and protein kinase C (PKC) inhibits BKCa channels, but little is known about PKC-mediated modulation of BKCa channel activity in pulmonary arterial smooth muscle. Studies were carried out to determine mechanisms of PKC modulation of BKCa channel activity in pulmonary arterial smooth muscle cells (PASMC) of the fawn-hooded rat (FHR), an animal model of pulmonary hypertension. Forskolin opened BKCa channels in FHR PASMC, which was blocked by PKC activation, and reversed by the phosphodiesterase (PDE) inhibitors IBMX, milrinone, and zaprinast. PDE inhibition also blocked the vasoconstrictor response to PKC activation in FHR pulmonary arteries. These results indicate that PKC inhibits cAMP-induced activation of BKCa channels and causes pulmonary vasoconstriction in hypertensive pulmonary arterial smooth muscle via PDE, which further suggests PDE inhibitors for treatment of pulmonary hypertension. © SAGE Publications 2008.
Comments

This article was published in Therapeutic Advances in Respiratory Disease, Volume 2, Issue 3, Pages 119-127.

The published version is available at http://dx.doi.org/10.1177/1753465808091327.

Copyright © 2008 Sage.

Citation Information
Shu Zhu, Richard E. White and Scott A. Barman. "Role of phosphodiesterases in modulation of BKCa channels in hypertensive pulmonary arterial smooth muscle" Therapeutic Advances in Respiratory Disease Vol. 2 Iss. 3 (2008) p. 119 - 127
Available at: http://works.bepress.com/richard_white/8/