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Related Experiment Videos

Radiation-induced bystander effect in immune response.

Shu-Zheng Liu1, Shun-Zi Jin, Xiao-Dong Liu

  • 1Department of Radiation Biology, Jilin University School of Public Health, 8 Xinmin Street, Changchun 130021, Jilin, China.

Biomedical and Environmental Sciences : BES
|June 19, 2004
PubMed
Summary

Low dose radiation can stimulate immune cells, inducing a beneficial bystander effect. In contrast, high doses inhibit immune cell proliferation, highlighting dose-dependent radiation responses.

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Area of Science:

  • Radiobiology
  • Immunology
  • Cellular Biology

Background:

  • The bystander effect in radiation research typically focuses on radiation-induced damage.
  • Limited research explores potential stimulatory or beneficial effects of low-dose radiation on bystander cells.

Purpose of the Study:

  • To investigate whether low-dose radiation can induce a stimulatory or beneficial bystander effect.
  • To differentiate the effects of low-dose versus high-dose radiation on immune cell interactions.

Main Methods:

  • A co-culture system of irradiated antigen-presenting cells (J774A.1) and unirradiated T lymphocytes (EL-4) was utilized.
  • Cell proliferation was assessed via 3H-TdR incorporation.
  • Expression of CD80/86 and CD48 on J774A.1 cells was measured using flow cytometry and immunohistochemistry.

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  • Nitric oxide (NO) release was quantified using the nitrate reduction method.

    • Main Results:

    • Low-dose irradiated J774A.1 cells stimulated proliferation in unirradiated EL-4 cells.
    • High-dose irradiated J774A.1 cells inhibited EL-4 cell proliferation.
    • Differential changes in CD48 expression and NO production in J774A.1 cells correlated with dose-dependent bystander effects.

    Conclusions:

    • Low-dose radiation can induce a stimulatory bystander effect in immune cells.
    • The dose of radiation is a critical factor determining the nature of the bystander effect (stimulatory vs. inhibitory).