Depletion of brain serotonin by 5,7-DHT: effects on the 8-OH-DPAT-induced changes of sleep and waking in the rat.
Psychopharmacology (Berl)
; 115(1-2): 273-7, 1994 Jun.
Article
en En
| MEDLINE
| ID: mdl-7532312
ABSTRACT
The effect of 5-HT1A receptor agonist 8-OH-DPAT on sleep and wakefulness was studied in rats with selective serotonin depletion after ICV administration of the neurotoxin 5,7-dihydroxytryptamine (5,7-DHT). Injection of 8-OH-DPAT to vehicle-treated animals induced biphasic effects, such that low doses (0.010 mg/kg) which act perferentially on the somatodendritic autoreceptor decreased wakefulness (W) and increased slow wave sleep (SWS), while higher doses (0.375 mg/kg) which stimulate postsynaptic receptors caused opposite effects. REM sleep was suppressed irrespective of the dosage given. Injection of the 0.010 mg/kg dose in the 5,7-DHT-treated rats did not result in significant changes in sleep or W. On the other hand, the 0.375 mg/kg dose produced changes in sleep variables which were similar to those described in the vehicle-treated animals. Our findings tend to indicate that increased SWS after low doses of 8-OH-DPAT depends upon the activation of inhibitory somatodendritic 5-HT1A receptors, while increased W after higher doses of the compound is related to stimulation of postsynaptic receptors.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Sueño
/
Vigilia
/
Química Encefálica
/
Serotonina
/
8-Hidroxi-2-(di-n-propilamino)tetralin
/
5,7-Dihidroxitriptamina
Límite:
Animals
Idioma:
En
Revista:
Psychopharmacology (Berl)
Año:
1994
Tipo del documento:
Article
País de afiliación:
Uruguay