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The sigma-1 Antagonist BMY-14802 Inhibits L-DOPA-induced Abnormal Involuntary Movements by a WAY-100635-sensitive Mechanism

The sigma-1 Antagonist BMY-14802 Inhibits L-DOPA-induced Abnormal Involuntary Movements by a WAY-100635-sensitive Mechanism

Melanie A Paquette, Katherine Foley, Elizabeth G Brudney, Charles K Meshul, Steven W Johnson, S Paul Berger

Psychopharmacology (Berl). 2009 Jul;204(4):743-54.

PMID: 19283364

Abstract:

Rationale:
Levodopa (L-DOPA), the gold standard treatment for Parkinson's disease (PD), eventually causes L-DOPA-induced dyskinesia (LID) in up to 80% of patients. In the 6-hydroxydopamine (6-OHDA) rat model of PD, L-DOPA induces a similar phenomenon, which has been termed abnormal involuntary movement (AIM). We previously demonstrated that BMY-14802 suppresses AIM expression in this model.
Objectives:
Although BMY-14802 is widely used as a sigma-1 antagonist, it is also an agonist at serotonin (5-HT) 1A and adrenergic alpha-1 receptors. The current study was conducted to determine which of these mechanisms underlies BMY-14802's AIM-suppressing effect. This characterization included testing the 5-HT1A agonist buspirone and multiple sigma agents. When these studies implicated a 5-HT1A mechanism, we subsequently undertook a pharmacological reversal study, evaluating whether the 5-HT1A antagonist WAY-100635 counteracted BMY-14802's AIM-suppressing effects.
Results:
Buspirone dose-dependently suppressed AIM, supporting past findings. However, no AIM-suppressing effects were produced by drugs with effects at sigma receptors, including BD-1047, finasteride, SM-21, DTG, trans-dehydroandrosterone (DHEA), carbetapentane, and opipramol. Finally, we show for the first time that the AIM-suppressing effect of BMY-14802 was dose-dependently prevented by WAY-100635 but not by the alpha-1 antagonist prazosin.
Conclusions:
BMY-14802 exerts its AIM-suppressing effects via a 5-HT1A agonist mechanism, similar to buspirone. Other 5-HT1A agonists have failed clinical trials, possibly due to submicromolar affinity at other receptors, including D2, which may exacerbate PD symptoms. BMY-14802 is a promising candidate for clinical trials due to its extremely low affinity for the D2 receptor and lack of extrapyramidal effects during prior clinical trials for schizophrenia.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP105565568	BMY-14802		105565-56-8	Price

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