Identification of Molecular Determinants for a Potent Mammalian TRPA1 Antagonist by Utilizing Species Differences

Overview

Journal J Mol Neurosci

Specialties Molecular Biology
Neurology

Date 2013 Jul 23

PMID 23872983

Citations 15

Authors

Kazumasa Nakatsuka

Rupai Gupta

Shigeru Saito

Nagako Banzawa

Kenji Takahashi

Makoto Tominaga

Toshio Ohta

Affiliations

Soon will be listed here.

Abstract

The transient receptor potential A1 (TRPA1) receptor is a member of the TRP family and an excitatory nonselective cation channel. An increasing body of evidence suggests that TRPA1 acts as a nociceptor for various chemicals and physical stimuli. Thus, many TRPA1 antagonists have been developed as analgesic agents. Recently, we found that AP18, a mammalian TRPA1 antagonist, does not inhibit heterologously expressed western clawed frog TRPA1 (fTRPA1). Here, we show that fTRPA1 is also insensitive to A967079, one of the most potent mammalian TRPA1 antagonists. Neither heterologously nor endogenously expressed fTRPA1 was inhibited by A967079 upon activation by TRPA1 agonists. Mutant channel analyses revealed that two specific amino acid residues located within the putative fifth transmembrane domain were involved in the inhibitory action of A967079. Our findings and previous reports based on species differences in the sensitivity to TRPA1 antagonists provide novel insights into the structure-function relationship of TRPA1 and supply useful information in the search for new analgesic medicines targeting TRPA1.

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