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Current Topics in Peptide & Protein Research   Volumes    Volume 14 
Orexin A induces sympathetic and thermogenic activation as a thermoregulatory peptide
M. Monda, An. Viggiano, D. Tafuri, E. Viggiano, S. Chieffi, V. De Luca, G. Messina
Pages: 41 - 48
Number of pages: 8
Current Topics in Peptide & Protein Research
Volume 14 

Copyright © 2013 Research Trends. All rights reserved

The hypothalamic peptide orexin A (also called hypocretin-1) was originally named so with the intend of emphasizing its role in promoting food intake. The aim of this brief review is to show that orexin A is an important neuropeptide that primarily controls body temperature through activation of the sympathetic nervous system. The modification of eating behavior due to orexin A could be only secondary to change in the thermoregulatory set-point. Activity of the sympathetic nerves system, brown adipose tissue and central body temperatures, heart rate and food intake were monitored to measure the modifications induced by an intracerebroventricular injection of orexin A on the thermoregulation and eating behavior in various experimental conditions in the rat. We report many experimental evidences derived from our laboratory to demonstrate that orexin A is a thermoregulatory peptide. Our viewpoint is compared with vision of other authors, finding possible agreement or disagreement.
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