Functional effects of alcohol withdrawal syndrome on peripheral sympathetic neurotransmission in vas deferens of adult rats

Functional effects of alcohol withdrawal syndrome on peripheral sympathetic neurotransmission in vas deferens of adult rats

Author Bomfim, Guilherme Henrique Souza Autor UNIFESP Google Scholar
Verde, Luciana Ferreira Autor UNIFESP Google Scholar
Frussa-Filho, Roberto Autor UNIFESP Google Scholar
Jurkiewicz, Aron Autor UNIFESP Google Scholar
Jurkiewicz, Neide Hyppolito Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Aims: Alcohol withdrawal syndrome (AWS) is characterized by a set of physiological modifications triggered by abrupt withdrawal and/or decreasing consumption of ethanol (EtOH), which May manifest 16-48 h after ceasing consumption. the relationship between the effects of AWS and central and peripheral sympathetic neurotransmission is unknown. This study investigates the possible mechanisms on the sympathetic system during periods of AWS.Main methods: Male Wistar rats were treated with EtOH (6-10 g/kg/day/v.o. 5 days). Subsequently, 1 h, 24 h, 48 h and 120 h after administration of the last dose of EtOH, the animals were sacrificed, and their vas deferens (VD) were removed to perform the following evaluations: (a) concentration-effect curves of sympathetic agonist; (b) activity of alpha(2)-adrenoreceptor; (c) function of voltage-dependent calcium channels (Cav); and (d) release of endogenous catecholamines measured in real time coupled to HPLC.Key findings: the results showed that the maximum effects of contraction were increased by agonists tested in at 24 h and 48 h EtOH withdrawal. the inhibitory affinity (pIC(50)) of guanfacine was decreased 24 h EtOH withdrawal. the function of Cav was also decreased as pIC50 values dropped 24 h and 48 h EtOH withdrawal. the release of catecholamines increased 48 h after EtOH withdrawal. It is suggested that AWS triggers hyperactivity in peripheral sympathetic neurotransmission.Significance: the mechanisms underlying hyperactivity are possibly explained by a failure of autoregulation from catecholamines released by alpha(2)-adrenoreceptors and/or an increase of Cav function, which may be potential targets to attenuate the symptoms of AWS at the peripheral level. (C) 2014 Published by Elsevier Inc.
Keywords Alcohol withdrawal syndrome
Peripheral sympathetic neurotransmission
Catecholamines
Calcium channels
Vas deferens
Language English
Sponsor Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number CAPES: 8477/2013-2
FAPESP: 2011/51778-3
Date 2014-07-11
Published in Life Sciences. Oxford: Pergamon-Elsevier B.V., v. 108, n. 1, p. 34-43, 2014.
ISSN 0024-3205 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 34-43
Origin http://dx.doi.org/10.1016/j.lfs.2014.05.002
Access rights Closed access
Type Article
Web of Science ID WOS:000338691600006
URI http://repositorio.unifesp.br/handle/11600/37988

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