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- Title
TRANSIENT RECEPTOR POTENTIAL (TRP) CHANNELS, VASCULAR TONE AND AUTOREGULATION OF CEREBRAL BLOOD FLOW.
- Authors
Brayden, Joseph E; Earley, Scott; Nelson, Mark T; Reading, Stacey
- Abstract
1. Members of the transient receptor potential (TRP) channel superfamily are present in vascular smooth muscle cells and play important roles in the regulation of vascular contractility. 2. The TRPC3 and TRPC6 channels are activated by stimulation of several excitatory receptors in vascular smooth muscle cells. Activation of these channels leads to myocyte depolarization, which stimulates Ca2+ entry via voltage-dependent Ca2+ channels (VDCC), leading to vasoconstriction. The TRPV4 channels in arterial myocytes are activated by epoxyeicosatrienoic acids, and activation of the channels enhances Ca2+ spark and transient Ca2+-sensitive K+ channel activity, thereby hyperpolarizing and relaxing vascular smooth muscle cells. 3. The TRPC6 and TRPM4 channels are activated by mechanical stimulation of cerebral artery myocytes. Subsequent depolarization and activation of VDCC Ca2+ entry is directly linked to the development of myogenic tone in vitro and to autoregulation of cerebral blood flow in vivo. 4. These findings imply a fundamental importance of TRP channels in the regulation of vascular smooth muscle tone and suggest that TRP channels could be important targets for drug therapy under conditions in which vascular contractility is disturbed (e.g. hypertension, stroke, vasospasm).
- Subjects
BLOOD circulation disorders; HEMODYNAMICS; CEREBRAL circulation; BLOOD flow; VASCULAR smooth muscle
- Publication
Clinical & Experimental Pharmacology & Physiology, 2008, Vol 35, Issue 9, p1116
- ISSN
0305-1870
- Publication type
Article
- DOI
10.1111/j.1440-1681.2007.04855.x