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Related Experiment Videos

Interferon and the epidermis: implications for cellular senescence.

M Peacocke1, M Yaar, B A Gilchrest

  • 1Department of Dermatology, Boston University School of Medicine, Massachusettes 02118.

Experimental Gerontology
|January 1, 1989
PubMed
Summary
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Human keratinocytes, skin cells, show reduced proliferation with age. Interferons (IFN) inhibit keratinocyte growth, with older cells being more sensitive to this growth inhibition.

Area of Science:

  • Cell Biology
  • Dermatology
  • Immunology

Background:

  • Human keratinocytes form the epidermis, providing protection and constantly renewing.
  • Keratinocyte proliferation decreases with donor age, indicating cellular aging.
  • Interferons (IFN) are known for antiviral properties and modulating cell growth.

Purpose of the Study:

  • To investigate the presence and role of growth inhibitors in human keratinocytes.
  • To determine if interferons (IFN) affect keratinocyte proliferation.
  • To compare the sensitivity of young and old keratinocytes to IFN growth inhibition.

Main Methods:

  • Immunofluorescence and Western blotting to detect IFN-alpha in skin.
  • Viral plaque inhibition assays to confirm IFN activity in keratinocyte extracts.

Related Experiment Videos

  • In vitro culture of keratinocytes to assess IFN's effect on proliferation.

    • Main Results:

    • A 40 kDa protein with IFN-alpha characteristics was detected in intact skin.
    • Keratinocyte extracts exhibited IFN activity, inhibiting viral growth.
    • IFN inhibited human keratinocyte growth reversibly and non-cytotoxically.
    • Keratinocytes from older donors were significantly more sensitive to IFN's growth inhibitory effects.

    Conclusions:

    • Interferons (IFN) are present in human skin and inhibit keratinocyte growth.
    • Aging increases keratinocyte sensitivity to the growth-inhibitory effects of IFN.
    • These findings suggest a role for IFN in age-related changes in skin renewal.