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Orexin/hypocretin neurons: chemical phenotype and possible interactions with melanin-concentrating hormone neurons. | LitMetric

Orexin/hypocretin neurons: chemical phenotype and possible interactions with melanin-concentrating hormone neurons.

Regul Pept

CNRS FRE 2174, Laboratoire d'Histologie, Faculté de Médecine, Place Saint-Jacques, 25030 cedex, Besançon, France.

Published: March 2002

AI Article Synopsis

Article Abstract

We showed earlier that a specific neuron population of the rat lateral hypothalamus, differing from the codistributed melanin-concentrating hormone (MCH) neurons, express both dynorphin (DYN) and secretogranin II (SgII) genes. We demonstrated later that this population corresponds in fact to the newly identified orexin/hypocretin (OX/Hcrt) neurons. In the present study, by revisiting the chemical phenotype of these neurons, we confirm that all of them contain DYN B- and SgII-immunoreactive materials. The roles played by these peptide/protein in OX/Hcrt neurons are still unclear. Double immunocytochemical stainings highlight putative somasomatic, axosomatic and axodendritic contacts between OX/Hcrt and MCH neurons. Adding OX/Hcrt to the culture medium of hypothalamic slices from 8-day-old rats results either in a significant increase of MCH mRNA after 24 h survival or a strong fall after 10 days culture. These results taken together suggest that OX/Hcrt can directly and/or indirectly affect MCH expression, and that both OX/Hcrt and MCH neuron populations interact to respond in a coordinated manner to central and peripheral signals.

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http://dx.doi.org/10.1016/s0167-0115(01)00320-2DOI Listing

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