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The type I interferon system is locally activated in psoriatic lesions

P Schmid1, P Itin, D Cox

  • 1Ciba Geigy Ltd., Pharma Division, Basel, Switzerland.

Journal of Interferon Research
|October 1, 1994
PubMed

Insights

The interferon (IFN) system is activated in psoriatic lesions, with IFN-gamma mRNA found in infiltrating leukocytes and IFN-alpha-inducible proteins in keratinocytes. This suggests a localized immune response specific to psoriasis.

Area of Science:

  • Immunology
  • Dermatology
  • Molecular Biology

Background:

  • Psoriasis is a chronic inflammatory skin disease.
  • The role of interferons (IFNs) in psoriasis pathogenesis is not fully understood.
  • Investigating the local expression of IFNs and IFN-inducible genes can elucidate disease mechanisms.

Purpose of the Study:

  • To investigate the expression patterns of interferon-gamma (IFN-gamma) mRNA, interferon-alpha (IFN-alpha) mRNA, and IFN-alpha-inducible genes in psoriatic lesions and noninvolved skin.
  • To determine if the interferon-alpha system is locally activated in psoriatic skin.

Main Methods:

  • In situ hybridization was used to detect specific mRNA expression.
  • Antisense RNAs were employed as probes for mRNA detection.
  • Expression of MxA protein and 2'-5' oligoadenylate (2-5A) synthetase was analyzed as markers for IFN-alpha system activation.

Main Results:

  • IFN-gamma mRNA was exclusively detected in psoriatic lesions, likely within infiltrating leukocytes.
  • Weak signals for IFN-alpha mRNA were found in the hyperkeratotic epidermis of psoriatic lesions.
  • Expression of MxA and 2-5A synthetase was significantly elevated in psoriatic keratinocytes compared to normal keratinocytes.

Conclusions:

  • The interferon-alpha system is selectively activated within psoriatic skin lesions.
  • This localized activation suggests a role for the IFN-alpha pathway in psoriasis pathogenesis.
  • The findings contribute to understanding the cytokine network in inflammatory skin diseases.

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