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Related Experiment Videos

Interleukin-6 in psoriasis: expression and mitogenicity studies.

J T Elder1, C I Sartor, D K Boman

  • 1Department of Dermatology, University of Michigan, Ann Arbor 48109-0672.

Archives of Dermatological Research
|January 1, 1992
PubMed
Summary

Interleukin-6 (IL-6) mRNA is increased in psoriatic skin. While IL-6 does not directly stimulate keratinocyte proliferation, it enhances clonal growth in the presence of epidermal growth factor (EGF) receptor signaling.

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Area of Science:

  • Dermatology
  • Molecular Biology
  • Cell Biology

Background:

  • Interleukin-6 (IL-6) is a cytokine implicated in skin conditions.
  • Its role as an autocrine mitogen in psoriatic epidermis requires further investigation.

Purpose of the Study:

  • To investigate IL-6 expression and its mitogenic potential in normal human keratinocytes (NHK) and psoriatic epidermis.
  • To elucidate the regulatory mechanisms of IL-6 mRNA expression and its proliferative effects.

Main Methods:

  • RNA extraction from normal and psoriatic epidermal biopsies.
  • Qualitative and semiquantitative PCR/Southern blot analyses for IL-6 mRNA.
  • Analysis of IL-6 expression in cultured NHK under varying conditions (calcium, cycloheximide).
  • Assessment of IL-6 mitogenic activity on NHK proliferation, including effects of EGF and blocking antibodies.

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Main Results:

  • IL-6 mRNA levels were significantly increased in lesional psoriatic epidermis compared to normal tissue.
  • IL-6 transcripts were inducible in NHK by calcium and cycloheximide, suggesting regulation by a labile protein.
  • IL-6 did not stimulate keratinocyte growth at high density but promoted clonal growth in EGF-deficient media.
  • The proliferative effect of IL-6 was dependent on EGF receptor signaling.

Conclusions:

  • IL-6 expression is upregulated in psoriatic epidermis.
  • IL-6's mitogenic activity on keratinocytes is context-dependent and mediated through the EGF receptor pathway.
  • IL-6 may play an indirect role in psoriatic skin proliferation.