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Phenytoin, phospholipids, and calcium.

M A Goldberg

    Neurology
    |September 1, 1977
    PubMed
    Summary

    Phenytoin binds strongly to brain phospholipids, especially those rich in certain fatty acids. This interaction enhances calcium binding, potentially explaining phenytoin's effectiveness in treating hypocalcemia.

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    Area of Science:

    • Neuropharmacology
    • Lipid Biochemistry

    Background:

    • Phenytoin is an anticonvulsant drug with a known mechanism involving ion channels.
    • Its interaction with cellular lipids, particularly phospholipids, is not fully understood.
    • Understanding these interactions may elucidate drug efficacy and side effects.

    Purpose of the Study:

    • To investigate the binding of phenytoin to various phospholipids.
    • To determine the relationship between phospholipid composition and phenytoin binding.
    • To explore the effect of phenytoin on calcium (Ca++) binding to phospholipids.

    Main Methods:

    • Fractionation of total lipids from rabbit and human brain.
    • Analysis of phospholipid binding activity with phenytoin.
    • Measurement of Ca++ binding to phospholipids in the presence and absence of phenytoin.

    Main Results:

    • Phenytoin demonstrated significant binding to phospholipids, particularly dipalmitoyl and dioleoyl lecithins.
    • A direct correlation was observed between phenytoin binding activity and lipid phosphorus content.
    • Phenytoin (1 x 10(-4) M) increased phospholipid binding of Ca++ up to fivefold.
    • Phenobarbital showed minimal interaction with phospholipids.

    Conclusions:

    • Phenytoin's binding to brain phospholipids is influenced by their fatty acid composition.
    • Enhanced Ca++ binding to phospholipids by phenytoin may contribute to its therapeutic effects in hypocalcemic conditions.
    • Both Ca++ and phospholipid binding are suggested as key factors in phenytoin's membrane-stabilizing actions.

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