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Neuroreport. 2000 Jan 17;11(1):103-8.

Hypocretin I in the lateral hypothalamus activates key feeding-regulatory brain sites.

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Veterans Affairs Medical Center, Research Service, Minneapolis, MN, USA.


Hypocretin I (also referred to as orexin A) administered into the lateral hypothalamus (LH) stimulates feeding in rats. We undertook the present study to determine the brain regions activated by LH administration of hypocretin I. Hypocretin I administered into the LH significantly elevated cFos-immunoreactivity in the lateral septal area, the central nucleus of the amygdala, the shell of the nucleus accumbens, the bed nucleus of the stria terminalis, the LH, the posterior and dorsomedial hypothalamus, the perifornical, arcuate and paraventricular nuclei and the nucleus of the solitary tract. These data indicate that LH hypocretin I communicates with other key energy regulatory sites within the hypothalamus, the limbic region and the hindbrain, and suggest that these areas are important in the feeding-stimulatory actions of hypocretin I.

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