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Dipropylacetate and aminoaciduria.

S Similä, L von Wendt, S L Linna

    Journal of the Neurological Sciences
    |February 1, 1980
    PubMed
    Summary

    Dipropylacetate (DPA), an anticonvulsant, causes high glycine levels in blood and spinal fluid. It also significantly increases the urinary excretion of multiple amino acids in epilepsy patients.

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    Area of Science:

    • Biochemistry
    • Neuropharmacology
    • Clinical Chemistry

    Background:

    • Dipropylacetate (DPA) is an established anticonvulsant used for epilepsy treatment.
    • Its precise mechanism of action is not fully understood, but it may affect gamma-aminobutyric acid (GABA) metabolism.
    • Emerging evidence suggests DPA impacts broader amino acid metabolism, indicated by observed hyperglycinemia.

    Purpose of the Study:

    • To investigate the effects of DPA on amino acid concentrations in plasma, cerebrospinal fluid (CSF), and urine.
    • To explore potential mechanisms behind DPA-induced metabolic alterations in epilepsy patients.

    Main Methods:

    • Analysis of plasma, CSF, and urinary amino acid levels in 10 epilepsy patients undergoing DPA treatment.
    • Comparison of amino acid profiles before and during DPA therapy.

    Main Results:

    • Patients on DPA exhibited significantly elevated glycine concentrations in plasma and CSF.
    • Levels of other plasma and CSF amino acids remained largely unchanged.
    • Marked increases in urinary excretion of alanine, asparagine, cystine, glycine, histidine, isoleucine, leucine, phenylalanine, and tyrosine were observed.

    Conclusions:

    • DPA treatment leads to secondary hyperglycinemia, potentially by inhibiting glycine conjugation pathways.
    • DPA or its metabolites may impair renal tubular reabsorption, causing generalized hyperaminoaciduria.
    • These findings highlight DPA's significant impact on amino acid metabolism beyond its anticonvulsant effects.

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