• Katharina Held, Tatjana Kichko, Katrien De Clercq, Hugo Klaassen, Rieta Van Bree, Jean-Christophe Vanherck, Arnaud Marchand, Peter W Reeh, Patrick Chaltin, Thomas Voets, and Joris Vriens.
• Laboratory of Obstetrics and Experimental Gynecology and Laboratory of Ion Channel Research and Transient Receptor Potential Research Platform Leuven, Catholic University of Leuven, B-3000 Leuven, Belgium;
• Proc. Natl. Acad. Sci. U.S.A. 2015 Mar 17; 112 (11): E1363-72.

AbstractTransient receptor potential (TRP) cation channel subfamily M member 3 (TRPM3), a member of the TRP channel superfamily, was recently identified as a nociceptor channel in the somatosensory system, where it is involved in the detection of noxious heat; however, owing to the lack of potent and selective agonists, little is known about other potential physiological consequences of the opening of TRPM3. Here we identify and characterize a synthetic TRPM3 activator, CIM0216, whose potency and apparent affinity greatly exceeds that of the canonical TRPM3 agonist, pregnenolone sulfate (PS). In particular, a single application of CIM0216 causes opening of both the central calcium-conducting pore and the alternative cation permeation pathway in a membrane-delimited manner. CIM0216 evoked robust calcium influx in TRPM3-expressing somatosensory neurons, and intradermal injection of the compound induced a TRPM3-dependent nocifensive behavior. Moreover, CIM0216 elicited the release of the peptides calcitonin gene-related peptide (CGRP) from sensory nerve terminals and insulin from isolated pancreatic islets in a TRPM3-dependent manner. These experiments identify CIM0216 as a powerful tool for use in investigating the physiological roles of TRPM3, and indicate that TRPM3 activation in sensory nerve endings can contribute to neurogenic inflammation.

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