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Related Experiment Videos

UV-induced changes in urinary polyamine excretion in the mouse.

N Seiler, W Richards, B Knödgen

    Archives of Dermatological Research
    |January 1, 1981
    PubMed
    Summary

    UV radiation significantly increases polyamine excretion in mice, lasting for days. This increase, involving free and acetylated polyamines, was notably reduced by alpha-difluoromethylornithine, an ornithine decarboxylase inhibitor.

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    Area of Science:

    • Dermatology
    • Biochemistry
    • Molecular Biology

    Background:

    • Ultraviolet (UV) radiation exposure is known to stimulate epidermal DNA synthesis, cell proliferation, and polyamine metabolism.
    • Polyamines play crucial roles in cell growth and differentiation, and their metabolism is altered during cellular stress responses.

    Purpose of the Study:

    • To investigate the effect of UV radiation on polyamine excretion in hairless mice.
    • To determine if changes in polyamine excretion can serve as a marker for UV-induced epidermal cell proliferation.
    • To evaluate the efficacy of ornithine decarboxylase inhibition in modulating UV-induced polyamine changes.

    Main Methods:

    • Hairless mice were exposed to germicidal lamp (254 nm) irradiation.
    • Urinary polyamine levels (free and acetylated) were measured over time.
    • The ratio of N1-acetylspermidine/N8-acetylspermidine was analyzed.
    • The effect of topical alpha-difluoromethylornithine, an ornithine decarboxylase inhibitor, was assessed.

    Main Results:

    • UV exposure induced a significant and prolonged increase in urinary polyamine excretion.
    • Both free and acetylated polyamines showed a similar increase in excretion.
    • The ratio of N1-acetylspermidine/N8-acetylspermidine showed a non-significant increase, limiting its utility as a proliferation marker.
    • Alpha-difluoromethylornithine administration effectively prevented the UV-induced increase in polyamine excretion.

    Conclusions:

    • UV radiation markedly elevates polyamine excretion in mice, reflecting altered polyamine metabolism and turnover in the epidermis.
    • While polyamine excretion increases, the N1-acetylspermidine/N8-acetylspermidine ratio is not a reliable marker for UV-induced proliferation.
    • Inhibition of ornithine decarboxylase is effective in preventing UV-induced changes in polyamine excretion, highlighting the enzyme's role in this response.

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