TY - JOUR
T1 - Sigma receptor 'antagonist' BMY 14802 increases neurotensin concentrations in the rat nucleus accumbens and caudate
AU - Levant, B.
AU - Nemeroff, C. B.
PY - 1990
Y1 - 1990
N2 - Acute and chronic treatment with antipsychotic drugs, such as haloperidol, selectively increases the concentrations of neurotensin (NT) in the nucleus accumbens and caudate of the rat. These increases in NT concentration in the nucleus accumbens and caudate have been hypothesized to underlie the therapeutic and extrapyramidal effects of antipsychotic drugs, respectively. The present study evaluates the effects of the putative antipsychotic and selective sigma receptor 'antagonist' BMY 14802 on regional brain NT concentrations. NT concentrations in discrete brain regions of adult, male, Sprague-Dawley rats were measured by a sensitive and specific radioimmunoassay. Like haloperidol (1 mg/kg i.p.), acute and chronic treatment with BMY 14802 (35 mg/kg/day i.p.) produced significant increases in the concentrations of NT in the nucleus accumbens and anterior and posterior caudate. This effect was dose-dependent. Maximal increases in NT concentration were observed 18 hr after a single dose of BMY 14802. Neither acute nor chronic treatment with the sigma 'agonist' (+)-SKF 10,047 (20 mg/kg i.p.), the N-methyl-D-aspartate-phencyclidine binding site antagonist MK-801 (0.25 mg/kg i.p.) or the selective D2 antagonist sulpiride (100 mg/kg i.p.), produced the pattern of NT alterations observed after the administration of BMY 14802. These findings suggest that the blockade of sigma receptors modulates NT concentrations in these brain regions.
AB - Acute and chronic treatment with antipsychotic drugs, such as haloperidol, selectively increases the concentrations of neurotensin (NT) in the nucleus accumbens and caudate of the rat. These increases in NT concentration in the nucleus accumbens and caudate have been hypothesized to underlie the therapeutic and extrapyramidal effects of antipsychotic drugs, respectively. The present study evaluates the effects of the putative antipsychotic and selective sigma receptor 'antagonist' BMY 14802 on regional brain NT concentrations. NT concentrations in discrete brain regions of adult, male, Sprague-Dawley rats were measured by a sensitive and specific radioimmunoassay. Like haloperidol (1 mg/kg i.p.), acute and chronic treatment with BMY 14802 (35 mg/kg/day i.p.) produced significant increases in the concentrations of NT in the nucleus accumbens and anterior and posterior caudate. This effect was dose-dependent. Maximal increases in NT concentration were observed 18 hr after a single dose of BMY 14802. Neither acute nor chronic treatment with the sigma 'agonist' (+)-SKF 10,047 (20 mg/kg i.p.), the N-methyl-D-aspartate-phencyclidine binding site antagonist MK-801 (0.25 mg/kg i.p.) or the selective D2 antagonist sulpiride (100 mg/kg i.p.), produced the pattern of NT alterations observed after the administration of BMY 14802. These findings suggest that the blockade of sigma receptors modulates NT concentrations in these brain regions.
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M3 - Article
C2 - 1973198
AN - SCOPUS:0025183196
VL - 254
SP - 330
EP - 335
JO - Journal of Pharmacology and Experimental Therapeutics
JF - Journal of Pharmacology and Experimental Therapeutics
SN - 0022-3565
IS - 1
ER -