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Título del libro: Neuropathology Of Drug Addictions And Substance Misuse
Título del capítulo: Nicotine and stimulatory effects on 5-ht drn neurons

Autores UNAM:
SALVADOR LEONARDO HERNANDEZ LOPEZ; RENE RAUL DRUCKER COLIN; LUCIAN STEFAN MIHAILESCU;
Autores externos:

Idioma:
Inglés
Año de publicación:
2016
Palabras clave:

5-HT neurons; Dorsal raphe nucleus; Nicotine; Nicotinic acetylcholine receptors


Resumen:

A large number of behaviors and brain functions are modulated by nicotine through stimulation of presynaptic and, less frequently, postsynaptic nicotinic acetylcholine receptors (nAChRs). Clinical and experimental studies suggested that many of nicotine's behavioral effects are mediated by the brain serotonergic (5-HT) system. Dorsal raphe nucleus (DRN) neurons give most of the forebrain 5-HT innervation. Brain slice experiments indicated that nicotine increases the firing activity of 60-80% of 5-HT DRN neurons. The stimulatory effects of nicotine are direct, dependent on ?7 and ?4?2 somatodendritic nAChRs, and indirect, dependent on presynaptic nAChRs located on glutamatergic (?4?2 nAChRs) and noradrenergic (?7 nAChRs) terminals in the DRN. Microdialysis experiments indicated that systemic nicotine increases 5-HT release in a large number of cerebral areas. Likewise, it was shown that most of nicotine's behavioral effects are mediated by stimulation of various subtypes of 5-HT receptors. © 2016 Elsevier Inc. All rights reserved.


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