UNDERSTANDING THE BIOLOGICAL IMPACT OF IONIZING RADIATION: MECHANISMS AND CLINICAL RELEVANCE
Keywords:
Ionizing radiation, DNA damage, tissue response, cell death pathways, radiotherapyAbstract
To explore the biological effects of ionizing radiation at molecular, cellular, and tissue levels, highlighting variations in severity based on radiation type, dose, and tissue radiosensitivity.
A detailed review of cellular and tissue responses to ionizing radiation, emphasizing the mechanisms of DNA damage, cell death pathways (mitotic death, apoptosis, necrosis, and autophagy), and classification of tissue effects into acute, subacute, and late stages.
Ionizing radiation induces DNA damage leading to diverse cellular responses depending on the cell type and dose. Acute effects predominantly affect rapidly renewing tissues and are often reversible with treatment, while subacute effects emerge during tissue remodeling. Late effects, particularly in slow-proliferating tissues like the central nervous system and kidneys, result in chronic and progressive damage with significant functional impairments. Factors such as radiation dose fractionation, cellular repair capabilities, and regenerative potential modulate the severity and timing of these effects.
Understanding the biological effects of ionizing radiation is critical for optimizing radiotherapy and managing risks in accidental or occupational exposures. The balance between therapeutic benefits and potential long-term damage hinges on a comprehensive grasp of these mechanisms.
Future research should prioritize uncovering molecular pathways involved in tissue regeneration and chronic damage, with the goal of enhancing therapeutic efficacy and minimizing long-term adverse effects.
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