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Effects of psychotropic agents on the physical properties of platelet membranes in vitro

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Abstract

Normal platelet membranes were exposed in vitro to a variety of psychotropic medications commonly used in the treatment of patients with psychiatric disorders. Changes in structural order at the hydrocarbon region of the drug-exposed membranes were determined by steadystate fluorescence polarization measurements employing the fluorescent probe 1,6-diphenyl-1,3,5-hexatriene (DPH). Chlorpromazine, an aliphatic phenothiazine, produced a significant increase in DPH fluorescence polarization at concentrations from 2–200 μM. Thioridazine, a piperidine phenothiazine, and three piperazine derivatives, perphenazine, trifluoperazine, and fluphenazine, produced significant increases in this parameter at concentrations from 20–200 μM. The other agents tested, including thiothixene, lithium, antidepressants, anxiolytics, and anticonvulsants, were without effect in the concentration ranges examined. The phenothiazine-induced increase in DPH fluoresence polarization apparently depended on the structure of the phenothiazine nucleus; changes in side-chain structure appeared to modulate this effect, most likely by altering the inherent membrane solubility of the agents.

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Authors and Affiliations

  1. Western Psychiatric Institute and Clinic, Department of Psychiatry, University of Pittsburgh School of Medicine, 3811 O'Hara Street, 15213, Pittsburgh, PA, USA

    George S. Zubenko

  2. Department of Biological Sciences, Mellon Institute, Carnegie-Mellon University, 15213, Pittsburgh, PA, USA

    George S. Zubenko

  3. Laboratories for Psychiatric Research, Mailman Research Center, McLean Hospital, 115 Mill Street, 02178, Belmont, MA, USA

    Bruce M. Cohen

  4. Harvard Medical School, 02115, Boston, MA, USA

    Bruce M. Cohen

Authors
  1. George S. Zubenko
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  2. Bruce M. Cohen
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Zubenko, G.S., Cohen, B.M. Effects of psychotropic agents on the physical properties of platelet membranes in vitro. Psychopharmacology 86, 369–373 (1985). https://doi.org/10.1007/BF00432231

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  • DOI: https://doi.org/10.1007/BF00432231

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