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Related Experiment Videos

Ionizing radiation induces human intercellular adhesion molecule-1 in vitro

U Behrends1, R U Peter, R Hintermeier-Knabe

  • 1Institute of Clinical Molecular Biology and Tumor Genetics, GSF, München, Germany.

The Journal of Investigative Dermatology
|November 1, 1994
PubMed
Summary

Ionizing radiation (IR) significantly increases intercellular adhesion molecule-1 (ICAM-1) expression in human cells and skin cultures. This radiation-induced ICAM-1 enhances immune cell adhesion, contributing to inflammation post-irradiation.

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Area of Science:

  • Immunology
  • Radiation Biology
  • Cell Biology

Background:

  • Intercellular adhesion molecule-1 (ICAM-1) is crucial in inflammatory responses.
  • Cytokines and UV irradiation are known inducers of ICAM-1 expression.

Purpose of the Study:

  • To investigate the impact of ionizing radiation (IR) on human ICAM-1 expression.
  • To elucidate the mechanisms of IR-induced ICAM-1 upregulation.

Main Methods:

  • Exposure of human cell lines (HL60, HaCaT, HeLa) and skin cultures to varying doses of IR.
  • Analysis of ICAM-1 mRNA and cell surface expression.
  • Immunohistologic examination of irradiated human skin.

Main Results:

  • IR elevated ICAM-1 mRNA levels in a dose-dependent manner (10-40 Gy) within 3-6 hours.

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  • ICAM-1 induction occurred at the transcriptional level, independent of de novo protein synthesis or autocrine factors.
  • IR increased ICAM-1 cell surface expression within 24 hours.
  • Upregulation of ICAM-1 was observed on epidermal keratinocytes and dermal microvascular endothelial cells in human skin cultures.

    • Conclusions:

    • Ionizing radiation is a potent inducer of ICAM-1 expression.
    • Radiation-induced ICAM-1 enhances immunologic cell adhesion.
    • ICAM-1 contributes to inflammatory reactions following irradiation.