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Decrease in free cystine content of cultured cystinotic fibroblasts by ascorbic acid.

W A Kroll, J A Schneider

    Science (New York, N.Y.)
    |December 13, 1974
    PubMed
    Summary
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    L-ascorbic acid significantly reduces high cystine levels in skin cells from nephropathic cystinosis patients. Daily ascorbic acid application is required for sustained reduction, with levels returning to normal upon its removal.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Medical Genetics

    Background:

    • Nephropathic cystinosis is characterized by a significant accumulation of free cystine within cells, particularly fibroblasts.
    • Elevated intracellular cystine levels are a hallmark of this genetic disorder, leading to various organ damages.

    Purpose of the Study:

    • To investigate the effect of L-ascorbic acid on the elevated free cystine content in cultured skin fibroblasts from nephropathic cystinosis patients.
    • To determine the efficacy and duration of L-ascorbic acid's impact on intracellular cystine levels.

    Main Methods:

    • Cultured skin fibroblasts from patients diagnosed with nephropathic cystinosis were utilized.
    • L-ascorbic acid was added to the culture medium at varying concentrations (0.29 to 2.9 millimolar).

    Related Experiment Videos

  • Intracellular free cystine content was measured over a 3-day period with daily ascorbic acid replenishment and after its removal.

    • Main Results:

    • A more than 50 percent decrease in the characteristic 100-fold increase of free cystine was observed upon L-ascorbic acid addition.
    • Daily addition of fresh L-ascorbic acid was necessary for a progressive reduction in cellular free cystine over 3 days.
    • Upon withdrawal of L-ascorbic acid, intracellular free cystine levels reverted to their original high values.

    Conclusions:

    • L-ascorbic acid demonstrates a significant inhibitory effect on cystine accumulation in fibroblasts from nephropathic cystinosis patients.
    • The observed reduction is dependent on continuous daily exposure to L-ascorbic acid, suggesting a dynamic interaction.
    • These findings highlight L-ascorbic acid's potential as a therapeutic agent or adjunct in managing cystinosis, warranting further investigation.