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Open AccessArticle

Effect of Capsaicin and Other Thermo-TRP Agonists on Thermoregulatory Processes in the American Cockroach

1
Department of Animal Physiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, 87-100 Toruń, Poland
2
Department of Biophysics, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, 87-100 Toruń, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Pin Ju Chueh
Molecules 2018, 23(12), 3360; https://doi.org/10.3390/molecules23123360
Received: 5 November 2018 / Revised: 17 December 2018 / Accepted: 17 December 2018 / Published: 18 December 2018
(This article belongs to the Special Issue Capsaicin II)
Capsaicin is known to activate heat receptor TRPV1 and induce changes in thermoregulatory processes of mammals. However, the mechanism by which capsaicin induces thermoregulatory responses in invertebrates is unknown. Insect thermoreceptors belong to the TRP receptors family, and are known to be activated not only by temperature, but also by other stimuli. In the following study, we evaluated the effects of different ligands that have been shown to activate (allyl isothiocyanate) or inhibit (camphor) heat receptors, as well as, activate (camphor) or inhibit (menthol and thymol) cold receptors in insects. Moreover, we decided to determine the effect of agonist (capsaicin) and antagonist (capsazepine) of mammalian heat receptor on the American cockroach’s thermoregulatory processes. We observed that capsaicin induced the decrease of the head temperature of immobilized cockroaches. Moreover, the examined ligands induced preference for colder environments, when insects were allowed to choose the ambient temperature. Camphor exposure resulted in a preference for warm environments, but the changes in body temperature were not observed. The results suggest that capsaicin acts on the heat receptor in cockroaches and that TRP receptors are involved in cockroaches’ thermosensation. View Full-Text
Keywords: temperature perception; TRP receptors; behavioral thermoregulation; American cockroach; allyl isothiocyanate; capsaicin; camphor; menthol; thymol temperature perception; TRP receptors; behavioral thermoregulation; American cockroach; allyl isothiocyanate; capsaicin; camphor; menthol; thymol
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MDPI and ACS Style

Maliszewska, J.; Jankowska, M.; Kletkiewicz, H.; Stankiewicz, M.; Rogalska, J. Effect of Capsaicin and Other Thermo-TRP Agonists on Thermoregulatory Processes in the American Cockroach. Molecules 2018, 23, 3360.

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