Dopamine receptor sensitive effect of dizocilpine on feeding behaviour.

Abstract:

:The effect of intracerebroventricular administration of dizocilpine on feeding behaviour and adrenal corticrotropic hormone (ACTH)-induced anorexia in elevated plus maze was examined. Dizocilpine (10, 20 and 40 nmol/rat, i.c.v.) showed a dose-dependent increase in food intake in 16 h food deprived rats. Dopamine receptor antagonists such as SCH 23390 (0.25 and 0.5 mg/kg, i.p.), pimozide (0.5 and 1 mg/kg, i.p.) and haloperidol (0.25 and 0.5 mg/kg, i.p.) dose-dependently blocked dizocilpine (40 nmol)-induced potentiation of food intake. Brain dopamine depletion by pretreatment with reserpine (5 mg/kg, i.p.) and alpha-methyl-p-tyrosine (200 mg/kg, i.p.) decreased food intake in rats. Similarly, pretreatment with reserpine and alpha-methyl-p-tyrosine (AMPT) reversed the hyperphagic effect of dizocilpine (20 and 40 nmol). Intracerebroventricular administration of ACTH (5 microgram/rat) produced significant diminution of feeding duration and increased tasting latency and feeding latency in elevated plus maze which was reversed by dizocilpine (40 nmol). SCH 23390 (0.25 mg/kg), pimozide (0.5 mg/kg) and haloperidol (0.25 mg/kg) reversed the effect of dizocilpine on ACTH-induced behaviours in elevated plus maze. The present observations support and extend the hypothesis that endogenous excitatory aminoacids (EAAs) play a role in the control of food intake. Further, dizocilpine-induced hyperphagia and dizocilpine-induced reversal of ACTH effect on feeding behaviour in elevated plus maze involve DAergic mediation.

journal_name

Brain Res

journal_title

Brain research

authors

Ninan I,Kulkarni SK

doi

10.1016/s0006-8993(98)00990-1

subject

Has Abstract

pub_date

1998-11-23 00:00:00

pages

157-63

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(98)00990-1

journal_volume

812

pub_type

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