Abstract |
Brain monoamines are reported to regulate body temperature and food intake. The objective of this study was to investigate the mechanism of brain monoamine metabolism in taurine- induced hypothermia and appetite suppression. In Experiment 1, 5-day-old male Julia layer chicks (n = 10) were subjected to intracerebroventricular (ICV) injection with saline or taurine (5 μmol/10 μL). In Experiment 2, the chicks were ICV injected with saline, taurine, fusaric acid ( dopamine-β- hydroxylase inhibitor: 558 nmol), or taurine with fusaric acid. In Experiment 3, the chicks were ICV injected with saline, taurine, para-chlorophenylalanine (PCPA, tryptophan hydroxylase inhibitor: 400 nmol), or taurine with PCPA. In Experiment 4, the chicks were ICV injected with saline, taurine, clorgyline ( monoamine oxidase inhibitor: 81 nmol), or taurine with clorgyline. Central taurine lowered rectal temperature at 30 min post-injection and increased norepinephrine in the brainstem and its metabolite 3-methoxy-4-hydroxyphenylglycol in both the diencephalon and brainstem. Similarly, taurine treatment induced increases in serotonin (5-HT) and its metabolite 5-hydroxyindoleacetic acid in the diencephalon. Fusaric acid completely and PCPA partially, but not clorgyline, attenuated taurine- induced hypothermia. The anorexigenic effect of taurine was partially attenuated by PCPA, but not fusaric acid nor clorgyline. In conclusion, central taurine activates dopamine-β- hydroxylase and tryptophan hydroxylase to produce norepinephrine and 5-HT, and then induces hypothermia, but 5-HT alone may be linked with taurine-induced anorexia in chicks.
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Authors | Mohamed Z Elhussiny, Haruka Nishimura, Phuong V Tran, Shogo Haraguchi, Elizabeth R Gilbert, Mark A Cline, Takashi Bungo, Mitsuhiro Furuse, Vishwajit S Chowdhury |
Journal | European journal of pharmacology
(Eur J Pharmacol)
Vol. 928
Pg. 175092
(Aug 05 2022)
ISSN: 1879-0712 [Electronic] Netherlands |
PMID | 35697149
(Publication Type: Journal Article)
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Copyright | Copyright © 2022 Elsevier B.V. All rights reserved. |
Chemical References |
- Taurine
- Serotonin
- Tryptophan Hydroxylase
- Fenclonine
- Dopamine
- Norepinephrine
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Topics |
- Animals
- Chickens
(metabolism)
- Dopamine
(pharmacology)
- Eating
- Fenclonine
(pharmacology)
- Hypothermia
(chemically induced)
- Male
- Norepinephrine
(pharmacology)
- Serotonin
(metabolism)
- Taurine
(pharmacology)
- Tryptophan Hydroxylase
(pharmacology)
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