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Effects of membrane fluidity on [3H]TCP binding to PCP receptors

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Abstract

Phencyclidine (PCP) binds with high affinity to the ion channel associated with the NMDA receptor. The binding of the PCP receptor-specific ligand TCP is greatly reduced at temperatures between 2°C and 6°C, at which the plasma membrane is in a rigid state. However, membrane rigidity alone does not appear to cause the reduced TCP binding, since the membrane fluidizing agent A2C did not increase TCP binding at 4°C; instead, it decreased binding at 21°C. This inhibitory effect of A2C on TCP binding was dose dependent and was highly correlated with A2C-induced increases in membrane fluidity. The IC50 of A2C inhibition was 8.9 mM, with a pseudo-Hill coefficient of −0.24. Scatchard analysis demonstrated that this effect was the result of an increase in the apparentK d of [3H]TCP for the PCP receptor, with no effect on theB max. These results suggest that the function of the NMDA-PCP receptor complex is impaired by increases in membrane fluidity. These findings may be pharmacologically relevant in understanding the mechanism of action of such agents as general anesthetics and ethanol, which cause increases in plasma membrane fluidity.

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  1. Developmental Neurobiology Program, Center for Neuroscience, Department of Psychiatry, University of Pittsburgh, Room E-1226, WPIC, 3811 O'Hara Street, 15213, Pittsburgh, PA, USA

    Frank R. DePietro & James C. Byrd

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  1. Frank R. DePietro
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  2. James C. Byrd
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Frank DePietro is the recipient of an NIH Medical Scientist Training Award to the University of Pittsburgh College of Medicine. This research was supported in part by NIMH grant MH30915.

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DePietro, F.R., Byrd, J.C. Effects of membrane fluidity on [3H]TCP binding to PCP receptors. J Mol Neurosci 2, 45–52 (1990). https://doi.org/10.1007/BF02896925

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