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Interleukin 6 and expression of its receptor on epidermal keratinocytes

K Yoshizaki1, N Nishimoto, K Matsumoto

  • 1Third Department of Internal Medicine, Osaka University Medical School, Japan.

Cytokine
|September 1, 1990
PubMed

Insights

Interleukin 6 (IL-6) is produced by skin cells and promotes their growth. This cytokine and its receptor are present on proliferative keratinocytes, suggesting a role in skin cell regulation.

Area of Science:

  • Dermatology
  • Cell Biology
  • Immunology

Background:

  • Interleukin 6 (IL-6) is a cytokine with known roles in inflammation and immunity.
  • The specific role of IL-6 in normal epidermal homeostasis and keratinocyte proliferation requires further elucidation.

Purpose of the Study:

  • To investigate the production and function of Interleukin 6 (IL-6) in human epidermal keratinocytes.
  • To determine the presence and localization of IL-6 receptors on keratinocytes.

Main Methods:

  • Detection of IL-6 in keratinocyte culture supernatants.
  • Immunohistochemical staining of cultured keratinocytes using anti-IL-6 antibodies.
  • Assessment of keratinocyte proliferation in response to recombinant IL-6.
  • Immunohistochemical analysis for IL-6 receptor expression on different keratinocyte layers.

Main Results:

  • Interleukin 6 (IL-6) was detected in keratinocyte culture supernatants and its production was enhanced by cytokine stimulation.
  • IL-6 significantly increased keratinocyte growth, measured by [3H] thymidine uptake and cell count.
  • IL-6 receptor expression was observed on proliferative keratinocytes in deeper layers but not on differentiated cells in upper layers.

Conclusions:

  • Epidermal keratinocytes produce IL-6, indicating an autocrine or paracrine role in skin.
  • IL-6 promotes normal keratinocyte proliferation, suggesting involvement in skin growth regulation.
  • The differential expression of IL-6 receptors on keratinocytes implies a specific role in regulating proliferative versus differentiated cell populations.

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