, Volume 120, Issue 4, pp 400–408 | Cite as

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

  • C. Smadja
  • R. Maldonado
  • S. Turcaud
  • M. C. Fournie-Zaluski
  • B. P. Roques
Original Investigation


Systemic administration of RB 101, a complete inhibitor of the enkephalin degrading enzymes, has been reported to induce naltrindole-reversed anti-depressant-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.

Key words

Conditioned suppression of motility Antidepressant-like effects Enkephalin-degrading enzymes RB 101 L-365,260 BC 264 L-364,718 δ-Opioid receptors 


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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • C. Smadja
    • 1
  • R. Maldonado
    • 1
  • S. Turcaud
    • 1
  • M. C. Fournie-Zaluski
    • 1
  • B. P. Roques
    • 1
  1. 1.Département de Pharmacochimie Moléculaire et StructuraleINSERM U266, CNRS URA D 1500, UFR des Sciences Pharmaceutiques et BiologiquesParis Cedex 06France

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