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The role of complement in UVB-induced inflammation.

W Torinuki, H Tagami

    Acta Dermato-Venereologica
    |January 1, 1986
    PubMed
    Summary

    The complement system amplifies late-phase skin inflammation after UVB exposure. Complement depletion reduced inflammation, but did not prevent initial leukocyte infiltration in UVB-irradiated guinea pigs.

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    Area of Science:

    • Immunology
    • Dermatology
    • Complement System

    Background:

    • Ultraviolet B (UVB) irradiation induces skin inflammation with leukocyte infiltration.
    • The role of the complement system in this inflammatory response is not fully understood.

    Purpose of the Study:

    • To investigate the complement system's involvement in UVB-induced skin inflammation and leukocyte infiltration.
    • To determine if complement activation is essential for initiating the inflammatory response.

    Main Methods:

    • Guinea pigs were decomplemented using cobra venom factor.
    • Decomplemented and saline-treated control animals were subjected to UVB irradiation.
    • Clinical responses and leukocyte infiltration were assessed.
    • Complement activation was measured by CH50 levels and anaphylatoxin generation in vitro.

    Main Results:

    • Complement-depleted animals exhibited a significantly weaker late-phase inflammatory response (12-48 hours post-UVB).
    • No complement activation (decreased CH50, anaphylatoxin generation) was observed after in vitro UVB irradiation of serum.
    • Initial leukocyte chemotaxis to the inflammatory site was not prevented by complement depletion.

    Conclusions:

    • The complement system contributes to amplifying the late phase of UVB-induced skin inflammation.
    • Complement activation is not the primary initiator of leukocyte chemotaxis in this model.
    • The complement system plays a supportive role in sustaining UVB-induced skin inflammation.

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