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      The dopamine D3 receptor partial agonist, BP 897, is an antagonist at human dopamine D3 receptors and at rat somatodendritic dopamine D3 receptors

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      European Journal of Pharmacology
      Elsevier BV

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          Abstract

          Recent studies have fueled the interest in dopamine D3 receptor antagonists and partial agonist for the treatment of psychosis and drug abuse, respectively. N-[4-[4-(2-methoxyphenyl)-1-piperazinyl]butyl]naphthalene-2-carboxamide (BP 897) is a dopamine D3 receptor selective ligand recently described as partial agonist with potential effects on drug-dependence. The aim of the present study was to determine both the functional activity of BP 897 at human dopamine D3 receptors expressed in Chinese hamster ovary (CHO) cells and in an electrophysiological in vivo model of dopaminergic activity. BP 897 failed to stimulate the human dopamine D3 receptor and showed antagonistic effects (cpIC(50)=9.51) in a [(35)S]GTPgammaS binding assay in cells expressing the human dopamine D3 receptor. In vivo, BP 897 up to 8.2 mg/kg, i.v., had no agonistic effects on firing rate of substantia nigra dopaminergic neurons and antagonized the quinpirole-induced inhibition of firing (DID(50)=1.1 mg/kg). Our data demonstrate that BP 897 acts, in vivo and in vitro, as a dopamine D3 receptor antagonist.

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          Author and article information

          Journal
          European Journal of Pharmacology
          European Journal of Pharmacology
          Elsevier BV
          00142999
          July 2001
          July 2001
          : 424
          : 2
          : 85-90
          Article
          10.1016/S0014-2999(01)01054-8
          11476753
          67d2b698-a8b9-4e5c-b0ae-a402afe2aaa5
          © 2001

          https://www.elsevier.com/tdm/userlicense/1.0/

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