Abstract
Lateral hypothalamic neuropeptides, orexins, have been recognized as one of the most important regulators of sleep/wakefulness states. Besides, these peptides are also regarded as an important factor that regulates feeding behavior, owing to their localization within the lateral hypothalamic area, the classic "feeding center", pharmacological activities, and the fact that prepro-orexin mRNA is upregulated when animals are fasted. This review summarizes the role of orexins in the regulation of feeding behavior and body weight homeostasis in relation to other systems that involve orexinergic neurotransmission.
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