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Immunomodulatory Effects of Radiotherapy
Sharda Kumari1, Shibani Mukherjee1, Debapriya Sinha1
1Division of Molecular Radiation Biology, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
International Journal of Molecular Sciences
|November 4, 2020
Summary
Radiation therapy (RT) uses different techniques, including high-energy radiation, to kill cancer cells. Advanced RT methods and understanding radiation
Area of Science:
- Oncology and Radiation Physics
Background:
- Radiation therapy (RT) is a cornerstone of cancer treatment, with evolving techniques enhancing its application.
- Different RT modalities, including conventional x-rays, stereotactic body RT, and particle therapies (protons, carbon ions), offer varied biological effects.
Purpose of the Study:
- To review the properties and applications of diverse radiation therapy techniques.
- To elucidate the differential DNA damage induction by low- vs. high-linear energy transfer (LET) radiation.
- To explore the immunomodulatory effects of RT and strategies for enhancing immune responses against tumors.
Main Methods:
- Review of existing literature on radiation therapy techniques, DNA damage mechanisms, and radiation-induced immunomodulation.
- Analysis of the biological impact of low-LET (e.g., x-rays) and high-LET (e.g., protons, carbon ions) radiation on cellular DNA.
- Discussion of molecular pathways involved in radiation-induced tumor cell death and immune system activation.
Main Results:
- Low-LET radiation causes simple DNA lesions, readily repaired by cells, while high-LET radiation induces complex, less repairable DNA damage, improving cancer cell killing.
- Radiation therapy can trigger immunogenic cell death, initiating innate and adaptive immune responses against tumors.
- Strategies exist to enhance the efficacy of RT-mediated immune responses.
Conclusions:
- Understanding the interplay between RT, DNA damage, and the immune system is crucial for optimizing cancer treatment.
- Targeted RT combined with immunomodulatory approaches holds promise for improving therapeutic outcomes and developing novel cancer therapies.
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