Regulation of pulmonary vasoconstriction by agonists and caveolae.

Experimental Lung Research
Christian SchachJason X-J Yuan

Abstract

Sustained pulmonary vasoconstriction contributes to the elevated pulmonary vascular resistance observed in pulmonary arterial hypertension. A rise in cytosolic Ca(2 +) in pulmonary artery smooth muscle cells (PASMCs) is major trigger for pulmonary vasoconstriction. One family of drugs currently being pursued as a potential treatment for pulmonary hypertension are the statins, which act by depleting cholesterol and reducing the number of caveolae. This study aimed at investigating the role of caveolae, membrane receptors, and ion channels (that are potentially located in the caveolae) in agonist-mediated pulmonary vasoconstriction in order to gain a greater understanding of the signaling mechanisms involved in the regulation of pulmonary vascular tone. Chronic treatment of PASMCs with the cholesterol-depleting agent, methyl-beta -cyclodextrin (Mbeta CD), significantly reduced the number of cholesterol rich caveolae regions in the membrane. This disruption of cholesterol in caveolae significantly inhibited pharmacomechanical (induced by phenylephrine), but not electromechanical (induced by elevated extracellular potassium concentration), rat pulmonary artery contraction. These results indicate that receptors may functionally colo...Continue Reading

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Citations

Dec 17, 2008·Current Opinion in Nephrology and Hypertension·Paul A Insel, Hemal H Patel
Jan 17, 2012·American Journal of Physiology. Heart and Circulatory Physiology·Frank K KuhrJason X-J Yuan
Jul 27, 2014·American Journal of Physiology. Heart and Circulatory Physiology·Louise E See HoeJason N Peart
Sep 12, 2009·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Arun H S KumarNoel M Caplice
Aug 5, 2021·Biochemical Society Transactions·Thibault R H Jouen-TachoirePaolo Tammaro

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