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Necrosis

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Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
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Tissue-Specific Iron Levels Modulate Lipid Peroxidation and the FLASH Radiotherapy Effect.

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    Area of Science:

    • Oncology
    • Radiation Oncology
    • Cellular Biology

    Background:

    • Iron is essential for cell function, but cancer cells exhibit higher iron dependency for growth.
    • Ferroptosis, an iron-dependent cell death, is a vulnerability in tumors and can be induced by radiation therapy (RT).
    • Ultra-high dose rate FLASH RT shows promise for improved cancer treatment by sparing normal tissues.

    Purpose of the Study:

    • To investigate the role of iron levels and ferroptosis in the protective mechanisms of FLASH RT on normal tissues.
    • To elucidate the differential impact of FLASH RT on lipid peroxidation and ferroptosis in tumor versus normal cells.
    • To determine if manipulating iron levels in normal tissues affects FLASH RT's protective outcomes.

    Main Methods:

    • Comparison of lipid peroxidation and ferroptosis induction in tumor and normal tissues after conventional RT and FLASH RT.
    • Administration of a high-iron diet to mice before and after FLASH RT to assess its impact on normal tissue damage.
    • Assessment of intestinal damage and lipid peroxidation levels in response to iron-enriched diets and RT.

    Main Results:

    • FLASH RT significantly increased lipid peroxidation and induced ferroptosis in tumor cells.
    • Normal tissues showed no significant increase in lipid peroxidation or ferroptosis with FLASH RT compared to conventional RT.
    • A high-iron diet reversed the protective effects of FLASH RT, leading to increased intestinal damage and lipid peroxidation in normal tissues.

    Conclusions:

    • Baseline iron levels critically influence the protective effects of FLASH RT on normal tissues.
    • Iron-driven lipid peroxidation is a key mediator of FLASH RT's differential response between normal and cancerous tissues.
    • Targeting iron metabolism may enhance the therapeutic efficacy and safety of FLASH RT in cancer treatment.