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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Updated: Nov 26, 2025

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Low dose ionizing radiation effects on the immune system.

Katalin Lumniczky1, Nathalie Impens2, Gemma Armengol3

  • 1National Public Health Centre, Department of Radiation Medicine, Budapest, Albert Florian u. 2-6, 1097, Hungary.

Environment International
|December 9, 2020
PubMed
Summary

Low-dose ionizing radiation profoundly impacts immune system balance, potentially accelerating aging and disease, yet also offers therapeutic benefits for inflammatory conditions. Understanding these effects is crucial for managing radiation exposure and developing new treatments.

Keywords:
DNA damage responseEpidemiological dataImmune systemInflammationLow-dose ionizing radiation

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Area of Science:

  • Immunology
  • Radiation Biology
  • Cellular Biology

Background:

  • Ionizing radiation's effects on the immune system are complex, involving a balance of cells and soluble factors crucial for tissue repair.
  • High-dose radiation causes cytotoxic effects, while low-dose exposure induces subtle, long-term quantitative and functional immune changes.

Purpose of the Study:

  • To review epidemiological, clinical, and experimental data on low-dose radiation's impact on immune cell homeostasis and function.
  • To discuss immune-mediated mechanisms in systemic responses to localized radiation exposure.
  • To highlight the fundamental and durable reshaping of the immune system by ionizing radiation.

Main Methods:

  • Review of epidemiological studies.
  • Analysis of clinical trial data.
  • Examination of experimental research findings.

Main Results:

  • Low-dose radiation can alter immune fitness, potentially accelerating immune senescence and increasing susceptibility to age-related diseases and cancer.
  • Paradoxically, low-dose radiation therapy shows anti-inflammatory and pain-relieving effects in chronic conditions.
  • Immune responses are implicated in systemic manifestations of localized radiation exposure.

Conclusions:

  • Ionizing radiation fundamentally and durably alters the immune system's structure and function.
  • Further research into immunological pathways is essential for enhancing radiation resilience and therapeutic applications.