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Keratinocyte expression of OKM5 antigen in inflammatory cutaneous disease

J N Barker1, A C Markey, M H Allen

  • 1Laboratory of Applied Dermatopathology, United Medical School, London, U.K.

The British Journal of Dermatology
|May 1, 1989
PubMed

Insights

Keratinocytes express OKM5 antigens in inflammatory skin conditions, but not OKM1 antigens. This suggests keratinocytes play a role in skin immunity and immune responses.

Area of Science:

  • Immunodermatology
  • Cellular Immunology
  • Cutaneous Biology

Background:

  • Keratinocytes are key cells in the epidermis.
  • Their role in immune responses is increasingly recognized.
  • Monocyte/macrophage surface antigens are important immune markers.

Purpose of the Study:

  • To investigate keratinocyte expression of monocyte/macrophage surface antigens (OKM1 and OKM5).
  • To correlate antigen expression with inflammatory cutaneous disorders.

Main Methods:

  • Immunohistochemical technique using peroxidase anti-peroxidase.
  • Examination of skin biopsies from patients with lichen planus, psoriasis, and atopic dermatitis.
  • Antibodies used: OKM1 and OKM5.

Main Results:

  • Positive suprabasal keratinocyte expression of OKM5 antigen was detected in all investigated inflammatory skin disorders.
  • Keratinocyte staining with OKM1 antibody was consistently negative.
  • Findings suggest keratinocytes may participate in cutaneous immune responses.

Conclusions:

  • Keratinocytes express OKM5, indicating a potential role in skin immunity.
  • The absence of OKM1 expression warrants further investigation.
  • Results align with observations of HLA-DR positive keratinocytes modulating T-cell responses.

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