Central GABAA receptor mediates taurine-induced hypothermia and possibly reduces food intake in thermo-neutral chicks and regulates plasma metabolites in heat-exposed chicks

Mohamed Z. Elhussiny, Phuong V. Tran, Cuong V. Pham, Linh T.N. Nguyen, Shogo Haraguchi, Elizabeth R. Gilbert, Mark A. Cline, Takashi Bungo, Mitsuhiro Furuse, Vishwajit S. Chowdhury

研究成果: Contribution to journalArticle査読

抄録

The aim of this study was to examine the central action of taurine on body temperature and food intake in neonatal chicks under control thermoneutral temperature (CT) and high ambient temperature (HT). Intracerebroventricular injection of taurine caused dose-dependent hypothermia and reduced food intake under CT. The mRNA expression of the GABAA receptors, GABAAR-α1 and GABAAR-γ, but not that of GABABR, significantly decreased in the diencephalon after central injection of taurine. Subsequently, we found that picrotoxin, a GABAAR antagonist, attenuated taurine-induced hypothermia. Central taurine significantly decreased the brain concentrations of 3-methoxy-4-hydroxyphenylglycol, a major metabolite of norepinephrine; however, the concentrations of serotonin, dopamine, and the epinephrine metabolites, 3,4-hydroxyindoleacetic acid and homovanillic acid, were unchanged. Although hypothermia was not observed under HT after central injection of taurine, plasma glucose and uric acid levels were higher, and plasma sodium and calcium levels were lower, than those in chicks under CT. In conclusion, brain taurine may play a role in regulating body temperature and food intake in chicks through GABAAR. The changes in plasma metabolites under heat stress suggest that brain taurine may play an important role in maintaining homeostasis in chicks.

本文言語英語
論文番号102905
ジャーナルJournal of Thermal Biology
98
DOI
出版ステータス出版済み - 5 2021

All Science Journal Classification (ASJC) codes

  • 生化学
  • 生理学
  • 農業および生物科学(全般)
  • 発生生物学

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