Involvement of nociceptive transient receptor potential channels in repellent action of pulegone.
Involvement of nociceptive transient receptor potential channels in repellent action of pulegone.
Biochem Pharmacol. 2018 Feb 28;:
Authors: Majikina A, Takahashi K, Saito S, Tominaga M, Ohta T
Abstract
Pulegone, one of avian repellents, is used to prevent the economic loss caused by birds. Chemical repellents often evoke unpleasant sensations and sensory irritation resulting in avoidance under some circumstances. It is recognized that some TRP channels expressing sensory neurons are related to nociception. Here we determined the molecular mechanisms of the repellent action of pulegone using isolated chicken sensory neurons and heterologous expression system. Pulegone increased the intracellular Ca2+ concentration ([Ca2+]i) in chicken sensory neurons. There were two types of neurons exhibiting different sensitivity to pulegone. One was responded to it at low concentrations and the other at high concentrations. Pharmacological analyses revealed that the former was predominantly mediated by TRP melastatin 8 (TRPM8), and the latter by both TRP ankyrin 1 (TRPA1) and TRPM8. An activation of both channels by pulegone was also determined using heterologously expression system. At high concentrations, pulegone suppressed chicken TRPM8 but not chicken TRPA1. The intraplantar injection of pulegone in chicks caused pain-related behaviors that were attenuated by TRPA1 antagonist. These results indicate that pulegone stimulates both TRPM8 and TRPA...
Source: Biochemical Pharmacology - Category: Drugs & Pharmacology Authors: Majikina A, Takahashi K, Saito S, Tominaga M, Ohta T Tags: Biochem Pharmacol Source Type: research