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Effects of 5-hydroxytryptamine and 5-hydroxytryptamine 2A/2C agonist on the genioglossus activity and sleep apnea in rats / 中华医学杂志(英文版)
Chinese Medical Journal ; (24): 2094-2098, 2010.
Artigo em Inglês | WPRIM | ID: wpr-241817
ABSTRACT
<p><b>BACKGROUND</b>5-Hydroxytryptamine (5-HT) is a common neurotransmitter in the brain which plays an important role in the pathogenesis of sleep apnea. Dysfunction of 5-HT and 5-HT(2) receptors may lead to the collapse of the upper airway and the instability of respiratory control, which in turn produce apnea. Genioglossus (GG) is one of the most important oropharyngeal muscles maintaining the upper airway open. The present study aimed to investigate the effects of 5-HT and 5-HT(2) receptor on GG activity and the sleep apnea in Sprague-Dawley (SD) rats.</p><p><b>METHODS</b>Microinjection probes were placed within the fourth ventricle of sixteen SD rats. After recovery for a week, the electromyogram (EMG) of GG was recorded in the anesthetized and vagotomized rats. The changes of GG activity before and after the microinjection of 5-HT or 5-HT(2A/2C) agonist -2,5-dimethoxy-4-iodoamphetamine hydrochloride (DOI) were observed. Probes were also laid in another eight SD rats. Electroencephalogram (EEG), EMG of neck muscle and respiration were recorded at the same time a week later. The effects of DOI on the occurrence of sleep apnea were explored.</p><p><b>RESULTS</b>Both 5-HT and DOI significantly enhanced the activity of GG just 3 minutes after the completion of injection. The effect of 5-HT disappeared quickly and the effect of DOI lasted for more than 27 minutes. DOI also significantly decreased the post-sigh apnea index in non-rapid-eye-movement (NREM) and rapid-eye-movement (REM) sleep and decreased the spontaneous apnea index only in NREM sleep (P < 0.05, respectively).</p><p><b>CONCLUSION</b>5-HT and 5-HT(2A/2C) system correlated closely with the pathogenesis of the sleep apnea syndrome and 5-HT receptors may become the target of the drug treatment.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Farmacologia / Síndromes da Apneia do Sono / Sono REM / Serotonina / Agonistas do Receptor de Serotonina / Ratos Sprague-Dawley / Usos Terapêuticos / Tratamento Farmacológico / Eletroencefalografia / Anfetaminas Limite: Animais Idioma: Inglês Revista: Chinese Medical Journal Ano de publicação: 2010 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Farmacologia / Síndromes da Apneia do Sono / Sono REM / Serotonina / Agonistas do Receptor de Serotonina / Ratos Sprague-Dawley / Usos Terapêuticos / Tratamento Farmacológico / Eletroencefalografia / Anfetaminas Limite: Animais Idioma: Inglês Revista: Chinese Medical Journal Ano de publicação: 2010 Tipo de documento: Artigo