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Gelatinase expression at positive patch test reactions.

Gianluigi Giannelli1, Caterina Foti, Felice Marinosci

  • 1Department of Internal Medicine, Immunology, and Infectious Diseases, Section of Internal Medicine, University of Bari Medical School, Bari, Italy.

Contact Dermatitis
|June 27, 2002
PubMed
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Matrix metalloproteases (MMPs), specifically MMP-2 and MMP-9, are elevated in allergic contact dermatitis (ACD) skin lesions. This suggests their involvement in ACD pathogenesis and epidermal alterations.

Area of Science:

  • Biochemistry
  • Dermatology
  • Immunology

Background:

  • Matrix metalloproteases (MMPs) are enzymes crucial for tissue remodeling and extracellular matrix (ECM) breakdown.
  • MMPs are secreted as inactive precursors and activated by membrane-type 1 MMP (MT1-MMP) and tissue inhibitor of MMP-2 (TIMP-2).
  • TIMP-2 regulates MMP activity and maintains a balance between proteolysis and inhibition.

Purpose of the Study:

  • To investigate the role of MMPs, specifically MMP-2 and MMP-9, and their inhibitors in allergic contact dermatitis (ACD).
  • To compare the expression of MMPs and TIMP-2 in involved versus uninvolved skin of ACD patients.
  • To assess serum levels of these proteins in ACD patients compared to healthy individuals.

Main Methods:

  • Analysis of MMP-2, MMP-9, TIMP-2, and MT1-MMP expression in skin biopsies from ACD patients during the challenge phase.

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  • Comparison of protein levels between lesional (involved) and non-lesional (uninvolved) skin.
  • Serum analysis of ACD patients and healthy controls.

    • Main Results:

    • MMP-2 and MMP-9 levels were significantly increased in the involved skin of ACD patients compared to uninvolved skin.
    • TIMP-2 expression was higher in uninvolved skin than in involved skin.
    • No significant differences in MT1-MMP staining were observed between involved and uninvolved skin.
    • Serum levels of these proteins did not differ between ACD patients and healthy subjects.

    Conclusions:

    • MMP-2 and MMP-9 likely contribute to the epidermal architectural changes observed in ACD.
    • These MMPs may play a significant role in the pathogenesis of ACD lesions.
    • Local skin expression, rather than systemic levels, appears relevant for MMP involvement in ACD.