BMY-14802 reversed the σ receptor agonist-induced neck dystonia in rats
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Summary
To clarify clinical roles of σ receptor binding affinity of neuroleptics, neck dystonia induced by microinjection of σ receptor ligands and neuroleptics into rat red nucleus was investigated. DTG and (+)-3-PPP, putative σ receptor agonists, induced neck dystonia in dose-dependent and reversible manner. Haloperidol and perphenazine induced dystonia in the same way as σ receptor agonists, whereas zotepine and (−)-sulpiride did not. The rank order of potency in induction of dystonia and σ receptor affinity of these compounds showed positive correlation. Although BMY-14802 has a high affinity for σ receptors, it never produced dystonia by itself. On the other hand, combined injection of BMY-14802 with DTG attenuated DTG-induced dystonia. Therefore, it is suggested that typical neuroleptics such as haloperidol act agonistic and atypical neuroleptics such as BMY-14802 act antagonistic at rubral σ receptors in the induction of neck dystonia.
Keywords
Sigma receptors neck dystonia red nucleus BMY-14802 neurolepticsPreview
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