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The Low-Threshold Calcium Channel Cav3.2 Determines Low-Threshold Mechanoreceptor Function. | LitMetric

The Low-Threshold Calcium Channel Cav3.2 Determines Low-Threshold Mechanoreceptor Function.

Cell Rep

Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, 141 rue de la Cardonille, 34094 Montpellier, France; CNRS UMR5203, 34095 Montpellier, France; INSERM, U661, 34095 Montpellier, France; Université de Montpellier, 34095 Montpellier, France. Electronic address:

Published: January 2015

AI Article Synopsis

Article Abstract

The T-type calcium channel Cav3.2 emerges as a key regulator of sensory functions, but its expression pattern within primary afferent neurons and its contribution to modality-specific signaling remain obscure. Here, we elucidate this issue using a unique knockin/flox mouse strain wherein Cav3.2 is replaced by a functional Cav3.2-surface-ecliptic GFP fusion. We demonstrate that Cav3.2 is a selective marker of two major low-threshold mechanoreceptors (LTMRs), Aδ- and C-LTMRs, innervating the most abundant skin hair follicles. The presence of Cav3.2 along LTMR-fiber trajectories is consistent with critical roles at multiple sites, setting their strong excitability. Strikingly, the C-LTMR-specific knockout uncovers that Cav3.2 regulates light-touch perception and noxious mechanical cold and chemical sensations and is essential to build up that debilitates allodynic symptoms of neuropathic pain, a mechanism thought to be entirely A-LTMR specific. Collectively, our findings support a fundamental role for Cav3.2 in touch/pain pathophysiology, validating their critic pharmacological relevance to relieve mechanical and cold allodynia.

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Source
http://dx.doi.org/10.1016/j.celrep.2014.12.042DOI Listing

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