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Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
Published on: December 31, 2013
TRPV4
1Institut für Pharmakologie u. Toxikologie, FB-Medizin, Philipps-Universität Marburg, 35032 Marburg, Germany. plant@staff.uni-marburg.de
Handbook of Experimental Pharmacology
|January 16, 2007
Summary
Transient Receptor Potential Vanilloid 4 (TRPV4) channels are activated by diverse physical and chemical signals. Studies in TRPV4 knockout mice indicate roles in osmoregulation, mechanosensation, and vascular control.
Area of Science:
- Ion channel physiology
- Molecular biology
- Physiology
Background:
- Transient Receptor Potential Vanilloid 4 (TRPV4) is a non-selective cation channel subunit found in many tissues.
- TRPV4 channels function as homotetramers and exhibit outward rectification, with higher permeability to Ca2+ than Na+.
Purpose of the Study:
- To review the activation mechanisms and physiological roles of TRPV4 channels.
- To highlight the involvement of arachidonic acid metabolism in TRPV4 activation.
Main Methods:
- Literature review of studies on TRPV4 channel function and physiology.
- Analysis of data from TRPV4 knockout mouse models.
Main Results:
- TRPV4 is activated by physical stimuli (swelling, heat, mechanical stress) and chemical agonists (endocannabinoids, arachidonic acid, phorbol esters).
- Activation by swelling and endocannabinoids involves epoxyeicosatrienoic acids (EETs) derived from arachidonic acid.
- TRPV4 plays roles in body fluid balance, mechanotransduction, thermosensation, vascular tone, and hearing.
Conclusions:
- TRPV4 is a versatile ion channel with diverse physiological functions.
- Further research is needed to identify the endogenous messenger for heat activation.
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