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The Journal of Neuroscience, February 1, 1999, 19(3):1072-1087
Synaptic Interaction between Hypocretin (Orexin) and Neuropeptide
Y Cells in the Rodent and Primate Hypothalamus: A Novel Circuit
Implicated in Metabolic and Endocrine Regulations
Tamas L.
Horvath1,
Sabrina
Diano1, and
Anthony
N.
van den Pol2
Departments of 1 Obstetrics and Gynecology and
2 Neurosurgery, Yale University School of Medicine, New
Haven, Connecticut 06520
Hypocretin (orexin) has recently been shown to increase feeding
when injected into the brain. Using both rat and primate brains, we
tested the hypothesis that a mechanism of hypocretin action might be
related to synaptic regulation of the neuropeptide Y (NPY) system.
Hypocretin-immunoreactive terminals originating from the lateral
hypothalamus make direct synaptic contact with neurons of the arcuate
nucleus that not only express NPY but also contain leptin receptors. In
addition, hypocretin-containing neurons also express leptin receptor
immunoreactivity. This suggests a potential mechanism of action for
hypocretin in the central regulation of metabolic and endocrine
processes. The excitatory actions of hypocretin could increase NPY
release, resulting in enhanced feeding behavior and altered endocrine
regulation, whereas leptin, released from adipose tissue as an
indicator of fat stores, would have the opposite effect on the same
neurons, leading to a decrease in NPY and NPY-mediated hypothalamic
functions. On the other hand, the innervation of hypocretin cells by
NPY boutons raises the possibility that NPY may exert an effect on
hypothalamic functions, at least in part, via mediation or feedback
action on these lateral hypothalamic cells. Our data indicate that a
direct interaction between leptin, hypocretin, and NPY exists in the
hypothalamus that may contribute to the central regulation of metabolic
and endocrine processes in both rodents and primates.
Key words:
hypocretin; orexin; neuropeptide Y; leptin receptor; synapse; hypothalamus; feeding; endocrine regulations
Copyright © 1999 Society for Neuroscience 0270-6474/99/1931072-16$05.00/0
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