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Opposite role of CCKA and CCKB receptors in the modulation of endogenous enkephalin antidepressant-like effects.

Abstract：

:Systemic administration of RB 101, a complete inhibitor of the enkephalin degrading enzymes, has been reported to induce naltrindole-reversed antidepressant-like effects in the conditioned suppression of motility (CSM) test in mice. The selective CCKB antagonist L-365,260 also elicits the same naltrindole-blocked responses on CSM. The aim of this study was therefore to investigate the possible modulation of RB 101 induced behavioral responses by activation or blockade of CCK receptors. Thus, the effects induced by RB 101 administered alone or associated with an ineffective dose of a selective CCKB agonist (BC 264), a CCKB antagonist (L-365,260) or a CCKA antagonist (L-364,718), were evaluated on the CSM in mice. RB 101 alone decreased the stress-induced loss of motility, as previously reported. The antidepressant-like effect of RB 101 was potentiated by L-365,260, and suppressed by BC 264 and to a lesser extent by L-364,718. The facilitatory effect induced by L-365,260 on RB 101 responses was blocked by the delta selective antagonist naltrindole. All these effects occurred only in shocked animals. The present results suggest that the activation of CCKA and CCKB receptors by endogenous CCK, could play an opposite role in the control of behavioral responses induced by endogenous enkephalins. Delta opioid receptors seem to be selectively involved in this interaction.

journal_name

Psychopharmacology (Berl)

journal_title

Psychopharmacology

authors

Smadja C,Maldonado R,Turcaud S,Fournie-Zaluski MC,Roques BP

doi

10.1007/BF02245811

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

400-8

issue

4

eissn

0033-3158

issn

1432-2072

journal_volume

120

pub_type

杂志文章

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