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Related Experiment Videos

Irradiation effects on wound contraction using a connective tissue model

A Yanase1, M Ueda, T Kaneda

  • 1Department of Oral Surgery, Nagoya University School of Medicine, Japan.

Annals of Plastic Surgery
|May 1, 1993
PubMed
Summary

X-ray irradiation of human oral fibroblasts inhibits wound contraction and fibroblast growth in a dose-dependent manner. This effect is linked to disrupted actin filament organization, impacting fibroblast function.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Radiation Oncology

Background:

  • Wound contraction is a critical phase of healing.
  • Fibroblast function, including their ability to contract collagen matrices, is essential for wound closure.
  • The impact of ionizing radiation on fibroblast behavior requires further elucidation.

Purpose of the Study:

  • To investigate the effects of x-ray irradiation on human oral fibroblasts.
  • To analyze the influence of radiation dose and time post-exposure on fibroblast growth and collagen gel contraction.
  • To examine the impact of irradiation on the actin filament organization within fibroblasts.

Main Methods:

  • Human oral mucosal fibroblasts were exposed to single doses of x-rays (2-10 Gy).
  • Fibroblast growth ability was assessed.

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  • Three-dimensional cultures in hydrated collagen gels were used to model wound contraction.
  • Actin filament organization was visualized using fluorescent dye-conjugated phalloidin.

    • Main Results:

    • X-ray irradiation inhibited fibroblast growth and collagen gel contraction in a dose-dependent manner.
    • The inhibitory effects were also dependent on the duration after irradiation.
    • Irradiated fibroblasts showed disrupted actin filament organization compared to control cells.
    • Control cells exhibited elongated cell projections, which were largely absent in irradiated cells.

    Conclusions:

    • X-ray irradiation negatively impacts fibroblast growth and their ability to contract collagen gels.
    • The disruption of actin filament organization is a key mechanism by which irradiation inhibits wound contraction.
    • These findings have implications for understanding radiation effects in oral mucosal healing.