Response of rat globus pallidus neurons to microintophoretically applied mu and kappa opioid receptor agonists.
Eur J Pharmacol
; 170(3): 179-91, 1989 Nov 07.
Article
em En
| MEDLINE
| ID: mdl-2575994
ABSTRACT
The effects of the microiontophoretic application of dynorphin A-(1-13) (DYN 13) and the benzomorphans ethylketocyclazocine (EKC), bremazocine and MRZ 2549, (kappa) opioid agonists, and of morphine and morphiceptin, (mu) opioid agonists, were compared on spontaneous or glutamate-evoked discharge of globus pallidus (GP) neurons in rat. Our results demonstrate that mu and kappa opioid agonists are able to depress the excitability of pallidal neurons, possibly by interacting with mu and kappa opioid receptor subtypes, respectively. In addition, the mu agonists and dynorphin A-(1-13), but not the benzomorphans, enhanced the excitability of a number of pallidal neurons. We have proposed a presynaptic site as the basis for this opioid-induced excitation, possibly also mediated by a mu opioid receptor. The selectivity of dynorphin A-(1-13) for benzomorphan kappa opioid receptors in the rat GP appears to be low and dynorphin A-(1-13) may elicit effects that are different from those produced by the benzomorphan kappa agonists by virtue of its ability to interact with other opioid receptor subtypes, for example mu opioid receptors.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Receptores Opioides
/
Globo Pálido
/
Entorpecentes
/
Neurônios
Limite:
Animals
Idioma:
En
Revista:
Eur J Pharmacol
Ano de publicação:
1989
Tipo de documento:
Article