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Related Experiment Videos

UVA-induced immunosuppression

G M Halliday1, R Bestak, K S Yuen

  • 1Department of Medicine (Dermatology), Royal Prince Alfred Hospital at University of Sydney, NSW, Australia. garyh@med.usyd.edu.au

Mutation Research
|January 27, 1999
PubMed
Summary
This summary is machine-generated.

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Chronic low-dose ultraviolet (UV) radiation, particularly UVA, suppresses the skin immune system in mice. Vitamin E may protect against UV-induced immunosuppression by inhibiting lipid peroxidation.

Area of Science:

  • Immunology
  • Dermatology
  • Photobiology

Background:

  • Chronic low-dose solar-simulated ultraviolet (UV) radiation is known to cause local and systemic immunosuppression.
  • UV-induced immunosuppression may facilitate the growth of UV-induced skin tumors by inhibiting tumor regression.
  • The specific effects of UVA radiation on the skin immune system require further investigation.

Purpose of the Study:

  • To investigate the impact of chronic low-dose UVA radiation on the skin immune system of C3H/HeJ mice.
  • To determine the role of reactive oxygen species and lipid peroxidation in UV-induced immunosuppression.

Main Methods:

  • Mice were exposed to chronic low-dose UVA and UVB radiation.
  • Contact sensitivity (CS) responses to TNCB were measured.

Related Experiment Videos

  • Numbers of epidermal Langerhans cells (LC) and dendritic epidermal T cells (DETC) were quantified.
  • The effect of Vitamin E on UV-induced immunosuppression and LC loss was assessed.

    • Main Results:

    • UVA + UVB irradiation significantly suppressed local and systemic primary CS responses and reduced LC and DETC numbers.
    • UVA irradiation alone induced local immunosuppression and reduced LC numbers but did not affect DETC.
    • Both UVA + UVB and UVA induced an impaired secondary CS response, indicating tolerance transferable with spleen cells.
    • Vitamin E administration prevented UV-induced immunosuppression and LC loss.

    Conclusions:

    • Chronic UVA exposure induces local immunosuppression and tolerance in C3H/HeJ mice.
    • UVA-induced immunosuppression may involve epidermal lipid peroxidation and subsequent LC migration.
    • Vitamin E shows potential in protecting the skin immune system against UV-induced damage by inhibiting lipid peroxidation.