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Related Experiment Videos

PUVA-induced blisters, complement deposition, and damage to the dermoepidermal junction.

P S Friedmann1, P Coburn, M G Dahl

  • 1Department of Dermatology, University of Newcastle-Upon-Tyne, England.

Archives of Dermatology
|November 1, 1987
PubMed
Summary

Psoralen plus long-wave ultraviolet light (PUVA) therapy can cause skin blistering due to dermoepidermal adhesion impairment. This finding was observed in patients undergoing PUVA treatment, highlighting a potential side effect.

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Area of Science:

  • Dermatology
  • Photobiology
  • Immunodermatology

Background:

  • Psoralen plus long-wave ultraviolet light (PUVA) therapy is a common dermatological treatment.
  • Skin blistering is an uncommon but reported side effect of PUVA therapy.
  • The precise mechanism underlying PUVA-induced blistering is not fully understood.

Purpose of the Study:

  • To investigate the development and characteristics of skin blistering in patients undergoing PUVA therapy.
  • To examine the ultrastructural and immunopathological features of PUVA-induced blisters.
  • To assess the prevalence and implications of impaired dermoepidermal adhesion in PUVA-treated patients.

Main Methods:

  • Clinical observation of 56 patients undergoing PUVA therapy.
  • Histopathological and immunofluorescence analysis of skin biopsy specimens from blistered and non-blistered sites.

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  • Ultrastructural examination of blister formation and separation planes.
  • Measurement of suction blister formation time in 51 patients.

    • Main Results:

    • Seven out of 56 patients developed non-hemorrhagic blisters on clinically normal skin, often associated with friction or trauma.
    • Immunofluorescence revealed granular C3 deposits at the dermoepidermal junction and/or around dermal blood vessels in all blistered patients.
    • Ultrastructural analysis showed blister separation within the lamina lucida, with impaired dermoepidermal adhesion observed in all PUVA-treated patients.

    Conclusions:

    • PUVA therapy can lead to impaired dermoepidermal adhesion, manifesting as skin blistering.
    • The presence of C3 deposits suggests an immune-mediated component in the blistering process.
    • Further research is needed to elucidate the exact mechanism of this dermoepidermal adhesion defect induced by PUVA treatment.