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The expression of dual-specificity phosphatase 1 mRNA is downregulated in lesional psoriatic skin

R B Kjellerup1, C Johansen, K Kragballe

  • 1Department of Dermatology, Aarhus University Hospital, P.P. Oerumsgade 11, 8000 Aarhus C, Denmark.

The British Journal of Dermatology
|August 29, 2012
PubMed
Abstract

Insights

Dual-specificity phosphatase 1 (DUSP1) is downregulated in psoriasis, impairing the p38 MAPK pathway. This reduced DUSP1 expression in psoriatic skin may drive persistent inflammation.

Area of Science:

  • Dermatology
  • Molecular Biology
  • Immunology

Background:

  • Psoriasis involves heightened p38 mitogen-activated protein kinase (MAPK) activity.
  • Dual-specificity phosphatase 1 (DUSP1) normally inhibits p38 MAPK signaling.
  • Understanding DUSP1's role is crucial for psoriasis pathogenesis.

Purpose of the Study:

  • Investigate DUSP1 mRNA expression in normal human epidermal keratinocytes (NHEKs) stimulated by cytokines.
  • Analyze DUSP1 mRNA levels in psoriatic skin lesions.
  • Explore the relationship between DUSP1 and p38 MAPK in psoriasis.

Main Methods:

  • Cultured NHEKs and analyzed mRNA expression via RT-qPCR.
  • Obtained skin biopsies from patients with psoriasis vulgaris and atopic dermatitis.
  • Assessed DUSP1 mRNA expression in lesional and non-lesional psoriatic skin.

Main Results:

  • Interleukin-1β rapidly induced DUSP1 mRNA in NHEKs via the p38 MAPK/MSK pathway.
  • DUSP1 mRNA was significantly downregulated in psoriatic lesions compared to non-lesional skin.
  • DUSP1 mRNA did not increase with adalimumab treatment in early stages.

Conclusions:

  • The p38 MAPK negative feedback loop involving DUSP1 appears inhibited in lesional psoriatic skin.
  • Reduced DUSP1 expression may contribute to sustained inflammation in psoriasis.
  • DUSP1 downregulation is specific to psoriatic lesions, unlike atopic dermatitis.

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