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Differential effects of fluphenazine-N-mustard, on calmodulin activity and on D1 and D2 dopaminergic responses

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Abstract

Fluphenazine-N-mustard (FNM) has been shown to irreversibly block dopaminergic receptor sites and inhibit certain dopaminergically-mediated behaviors. In this study we measured whether FNM has any differential effects on D1 and D2 dopaminergic events. Accordingly, we examined the relative effects of FNM on rotational behavior induced by SKF 38393 (D1 agonist) and Ly 171555 (D2 agonist) in mice with unilateral, 6-hydroxydopamine-induced lesions of the striatum and the effects of FNM on the binding of [3H]Sch 23390 (D1 ligand) and [3H]spiroperidol (D2 ligand) to mouse striatal membranes. FNM inhibited rotational behavior induced by Ly 171555 at doses 10-fold lower than those required to block rotations induced by SKF 38393 (ID50 values: Ly 171555=1.8 μmole/kg, IP; SKF 38393=16 μmole/kg, IP). The inhibitory effect of high doses of FNM (20 μmole/kg) on rotational behavior was overcome by increasing the dose of SKF 38393 and apomorphine, a nonselective dopaminergic agonist. By contrast, the inhibitory effect of FNM was not overcome by Ly 171555, even when given in doses more than 100 times its ED50. Using striatal homogenates in vitro, FNM inhibited the specific binding of [3H]spiroperidol at concentrations about 10-fold lower than those required to inhibit the binding of [3H]Sch 23390 (IC50 values: [3H]spiroperidol=90 nM; [3H]Sch 23390=840 nM). Considerably higher concentrations of FNM were needed to irreversibly inhibit calmodulin activity in striatal homogenates (IC50=10 μM). In vivo, FNM inhibited the binding of [3H]spiroperidol measured ex vivo (ID50=4 μmole/kg), but did not inhibit the binding of [3H]Sch 23390, even when given in doses as high as 100 μmole/kg. These studies indicate that FNM was approximately 10 times more potent at inhibiting D2-than D1-mediated behavior and at displacing D2 versus D1 ligands and suggest that FNM may be useful for studying and differentiating D2- and D1-mediated events.

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  1. Division of Neuropsychopharmacology, Department of Pharmacology, Medical College of Pennsylvania at Eastern Pennsylvania, Psychiatric Institute, 3200 Henry Avenue, 19129, Philadelphia, PA, USA

    J. D. Winkler, K. Thermos & B. Weiss

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  1. J. D. Winkler
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  2. K. Thermos
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  3. B. Weiss
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Winkler, J.D., Thermos, K. & Weiss, B. Differential effects of fluphenazine-N-mustard, on calmodulin activity and on D1 and D2 dopaminergic responses. Psychopharmacology 92, 285–291 (1987). https://doi.org/10.1007/BF00210832

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