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001-es BibID:	BIBFORM059225
Első szerző:	Hrabovszky Erik
Cím:	Orexinergic Input to Dopaminergic Neurons of the Human Ventral Tegmental Area / Erik Hrabovszky, Csilla S. Molnár, Beáta Á. Borsay, Péter Gergely, László Herczeg, Zsolt Liposits
Dátum:	2013
ISSN:	1932-6203
Megjegyzések:	The mesolimbic reward pathway arising from dopaminergic (DA) neurons of the ventral tegmental area (VTA) has been strongly implicated in reward processing and drug abuse. In rodents, behaviors associated with this projection are profoundly influenced by an orexinergic input from the lateral hypothalamus to the VTA. Because the existence and significance of an analogous orexigenic regulatory mechanism acting in the human VTA have been elusive, here we addressed the possibility that orexinergic neurons provide direct input to DA neurons of the human VTA. Dual-label immunohistochemistry was used and orexinergic projections to the VTA and to DA neurons of the neighboring substantia nigra (SN) were analyzed comparatively in adult male humans and rats. Orexin B-immunoreactive (IR) axons apposed to tyrosine hydroxylase (TH)-IR DA and to non-DA neurons were scarce in the VTA and SN of both species. In the VTA, 15.0?2.8% of TH-IR perikarya in humans and 3.2?0.3% in rats received orexin B-IR afferent contacts. On average, 0.24?0.05 and 0.05?0.005 orexinergic appositions per TH-IR perikaryon were detected in humans and rats, respectively. The majority (86?88%) of randomly encountered orexinergic contacts targeted the dendritic compartment of DA neurons. Finally, DA neurons of the SN also received orexinergic innervation in both species. Based on the observation of five times heavier orexinergic input to TH-IR neurons of the human, compared with the rat, VTA, we propose that orexinergic mechanism acting in the VTA may play just as important roles in reward processing and drug abuse in humans, as already established well in rodents.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Axons Neurons neuronal dendrites Dopamine dopaminergics drug abuse Rodents ventral tegmental area
Megjelenés:	Plos One. - 8 : 12 (2013), p. e83029. -
További szerzők:	Molnár Csilla S. (Budapest) Borsay Beáta Á. (1982-) (igazságügyi orvosszakértő) Gergely Péter (1974-) (igazságügyi orvosszakértő) Herczeg László (1954-) (igazságügyi orvosszakértő) Liposits Zsolt
Pályázati támogatás:	OTKA-K83710 OTKA OTKA-K100722 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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