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The mechanosensitive nature of TRPV channels

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Abstract

Transient receptor potential vanilloid (TRPV) channels are widely expressed in both sensory and nonsensory cells. Whereas the channels display a broad diversity to activation by chemical and physical stimuli, activation by mechanical stimuli is common to many members of this group in both lower and higher organisms. Genetic screening in Caenorhabditis elegans has demonstrated an essential role for two TRPV channels in sensory neurons. OSM-9 and OCR-2, for example, are essential for both osmosensory and mechanosensory (nose-touch) behaviors. Likewise, two Drosophila TRPV channels, NAN and IAV, have been shown to be critical for hearing by the mechanosensitive chordotonal organs located in the fly’s antennae. The mechanosensitive nature of the channels appears to be conserved in higher organisms for some TRPV channels. Two vertebrate channels, TRPV2 and TRPV4, are sensitive to hypotonic cell swelling, shear stress/fluid flow (TRPV4), and membrane stretch (TRPV2). In the osmosensing neurons of the hypothalamus (circumventricular organs), TRPV4 appears to function as an osmoreceptor, or part of an osmoreceptor complex, in control of vasopressin release, whereas in inner ear hair cells and vascular baroreceptors a mechanosensory role is suggestive, but not demonstrated. Finally, in many nonsensory cells expressing TRPV4, such as vascular endothelial cells and renal tubular epithelial cells, the channel exhibits well-developed local mechanosensory transduction processes where both cell swelling and shear stress/fluid flow lead to channel activation. Hence, many TRPV channels, or combinations of TRPV channels, display a mechanosensitive nature that underlies multiple mechanosensitive processes from worms to mammals.

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  1. Department of Integrative Biology and Pharmacology, Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA

    Roger G. O‘Neil

  2. Department of Otolaryngology and Program in Neuroscience, Harvard Medical School and Massachusetts Eye and Ear Infirmary, Boston, MA, 02114, USA

    Stefan Heller

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O‘Neil, R.G., Heller, S. The mechanosensitive nature of TRPV channels. Pflugers Arch - Eur J Physiol 451, 193–203 (2005). https://doi.org/10.1007/s00424-005-1424-4

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