Modification of cardiovascular response of adenosine A1 receptor agonist by cyclic AMP in the spinal cord of the rats.
Neurosci Lett
; 219(3): 195-8, 1996 Nov 29.
Article
em En
| MEDLINE
| ID: mdl-8971813
ABSTRACT
This study was performed to investigate the influence of the spinal adenosine A1 receptors on the central regulation of blood pressure (BP) and heart rate (HR), and to define whether its mechanism is mediated by cyclic AMP (cAMP) or cyclic GMP (cGMP). Intrathecal (i.t.) administration of drugs at the thoracic level were performed in anesthetized, artificially ventilated male Sprague-Dawley rats. Injection (i.t.) of adenosine A1 receptor agonist, N6-cyclohexyladenosine (CHA; 1, 5 and 10 nmol) produced dose dependent decrease of BP and HR. Pretreatment with a cAMP analogue, 8-bromo-cAMP, attenuated the depressor and bradycardiac effects of CHA (10 nmol), but not with cGMP analogue, 8-bromo-cGMP. These results suggest that adenosine A1 receptor in the spinal cord plays an inhibitory role in the central cardiovascular regulation and that this depressor and bradycardiac actions are mediated by cAMP.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Medula Espinal
/
Pressão Sanguínea
/
Adenosina
/
AMP Cíclico
/
Agonistas do Receptor Purinérgico P1
/
Frequência Cardíaca
Limite:
Animals
Idioma:
En
Ano de publicação:
1996
Tipo de documento:
Article