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Upregulation of CD40 and CD40 ligand expression in IgE-associated cutaneous diseases

B Hermes1, M Worm, F Nowak

  • 1Department of Dermatology, Virchow-Klinikum, Humboldt-Universität, Berlin, Germany.

Acta Dermato-Venereologica
|December 12, 1997
PubMed

Insights

Skin cells in atopic dermatitis (AD) and scabies show increased IgE and CD40/CD40L expression, suggesting the skin may contribute to IgE synthesis, unlike chronic urticaria.

Area of Science:

  • Immunodermatology
  • Cutaneous Immunology
  • Allergy Research

Background:

  • Immunoglobulin E (IgE) is central to allergic skin diseases.
  • CD40 and CD40 Ligand (CD40L) are crucial for B-cell IgE synthesis.
  • Understanding IgE-associated cutaneous disease requires examining these molecules in skin.

Purpose of the Study:

  • To investigate the expression of IgE, its receptors (Fc epsilon RI, Fc epsilon RII), and CD40/CD40L in various skin conditions.
  • To compare these expressions in atopic dermatitis (AD), scabies, and chronic urticaria with normal skin.
  • To analyze these markers in a dermopathic lymph node versus normal lymphatic tissue.

Main Methods:

  • Immunohistochemistry was employed to detect protein expression.
  • Analysis included skin samples from AD, scabies, chronic urticaria patients, and healthy controls.
  • Lymphatic tissue from a patient with AD and a normal donor was also examined.

Main Results:

  • Increased expression of IgE, Fc epsilon RI, Fc epsilon RII, CD40, and CD40L was observed in the skin of AD and scabies patients compared to normal skin.
  • These increases were localized to the dermis and partly the epidermis.
  • Chronic urticaria skin showed no significant changes in these markers; lymphatic tissue showed CD40/CD40L in both normal and AD cases, but IgE/Fc epsilon RI primarily in AD.

Conclusions:

  • Elevated IgE/Fc epsilon RI and associated CD40/CD40L expression in AD and scabies skin suggests a role for cutaneous tissue in IgE synthesis.
  • The findings indicate that skin, alongside lymphatic tissue, may actively participate in the pathogenesis of IgE-mediated skin diseases.
  • This highlights potential therapeutic targets within the skin microenvironment for allergic dermatoses.

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