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5-Hydroxytryptamine and tryptamine pathways in scleroderma

A Stachow, S Jablonska, A Skiendzielewska

    The British Journal of Dermatology
    |August 1, 1977
    PubMed
    Summary
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    Patients with scleroderma show abnormal tryptophan metabolism, with impaired serotonin conversion and potential excess tryptamine. This suggests a link to reduced monoamine oxidase activity in scleroderma patients.

    Area of Science:

    • Biochemistry
    • Medical Research
    • Scleroderma Pathophysiology

    Background:

    • Scleroderma is a complex autoimmune disease affecting connective tissues.
    • Tryptophan metabolism plays a role in various physiological processes, including serotonin production.

    Purpose of the Study:

    • To investigate tryptophan metabolism in patients with systemic and cutaneous scleroderma.
    • To assess the urinary levels of key indole metabolites before and after L-tryptophan loading.

    Main Methods:

    • Urine samples were collected from 23 systemic scleroderma and 7 cutaneous scleroderma patients.
    • Levels of 5-hydroxyindoleacetic acid, indoleacetic acid, and total indoles were measured.
    • Measurements were taken before and after oral L-tryptophan administration (0.1 g/kg body weight).

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    Main Results:

    • Baseline 5-hydroxyindoleacetic acid levels were generally normal in scleroderma patients.
    • After L-tryptophan loading, approximately half of the patients showed an inadequate increase in 5-hydroxyindoleacetic acid.
    • A high ratio of total indoles to indoleacetic acid suggested elevated tryptamine levels.

    Conclusions:

    • Scleroderma patients exhibit abnormal metabolism of tryptophan-derived biogenic amines.
    • Impaired conversion of serotonin to 5-hydroxyindoleacetic acid was observed.
    • Findings suggest potential dysfunction of monoamine oxidase in scleroderma.