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Microtubules regulate expression of ICAM-1 in epidermoid cells (KB cells)

M Kaatz1, L Berod, M Lagadari

  • 1Department of Dermatology, University of Jena, Jena, Germany.

Skin Pharmacology and Physiology
|August 26, 2006
PubMed

Insights

Microtubule-disrupting agents enhance intercellular adhesion molecule-1 (ICAM-1) expression on human epidermoid cells. This suggests the microtubule network plays a key role in regulating ICAM-1 expression.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Intercellular adhesion molecule-1 (ICAM-1) is crucial for cell interactions, particularly with leukocytes.
  • ICAM-1 expression is typically low in human epidermoid KB cells but can be induced by interferon-gamma (IFN-gamma).

Purpose of the Study:

  • To investigate the role of the microtubule network in regulating ICAM-1 expression in KB cells.
  • To determine how microtubule-disrupting agents affect ICAM-1 surface expression and transcript levels.

Main Methods:

  • Treatment of KB cells with microtubule-disrupting agents (colchicine, nocodazole, vinblastine).
  • Assessment of ICAM-1 surface expression via flow cytometry.
  • Analysis of ICAM-1 mRNA levels and half-life using molecular biology techniques.
  • Evaluation of actinomycin D's effect on ICAM-1 expression.

Main Results:

  • Microtubule-disrupting agents significantly increased both constitutive and IFN-gamma-induced ICAM-1 surface expression.
  • These agents also elevated steady-state ICAM-1 transcript levels without affecting mRNA half-life.
  • Actinomycin D blocked the potentiation of ICAM-1 expression by microtubule-disrupting agents.
  • Glyceraldehyde-3-phosphate dehydrogenase mRNA and integrin levels remained unchanged.

Conclusions:

  • The microtubule network exerts a regulatory control over ICAM-1 expression.
  • Microtubule disruption influences ICAM-1 expression at a post-transcriptional or translational level, rather than affecting mRNA stability.

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