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Particle Radiation Side-Effects: Intestinal Microbiota Composition Shapes Interferon-γ-Induced Osteo-Immunogenicity.

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Restricted gut microbiota (RM) in mice mitigates radiation-induced bone loss by reducing inflammation and altering bacterial composition. This study highlights the gut microbiome

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Area of Science:

  • Microbiology and Immunology
  • Bone Biology and Radiation Oncology

Background:

  • Gut microbiota influences bone health, with potential roles in mitigating or exacerbating radiation-induced bone loss.
  • Previous research indicated that restricted microbiota (RM) reduced inflammatory markers like tumor necrosis factor (TNF) and interleukin-17 (IL-17) compared to conventional microbiota (CM).

Purpose of the Study:

  • To investigate the impact of gut microbiota composition on radiation-induced bone loss.
  • To explore the relationship between specific bacterial phylotypes and bone structural integrity following particle radiation exposure.
  • To assess the role of IL-17 in modulating the gut microbiota response to irradiation.

Main Methods:

  • Comparison of conventional microbiota (CM) and restricted microbiota (RM) mice exposed to 1.5 Gy 28Si ions.
  • Analysis of inflammatory markers (TNF, IL-17, interferon-γ) in bone marrow and blood.
  • Fecal bacterial composition analysis using 16S rRNA sequencing and correlation with bone parameters (trabecular number, thickness, separation, cortical thickness).

Main Results:

  • RM mice exhibited reduced inflammatory markers and better bone structure (higher trabecular numbers, reduced cortical thickness loss) post-irradiation compared to CM mice.
  • IL-17 blockage altered bacterial phylotypes, indicating its role in microbiota modulation during irradiation.
  • Specific bacterial taxa, including Muribaculum intestinale, Bacteroides massiliensis, and Prevotella denticola, were correlated with improved bone parameters in RM mice.

Conclusions:

  • Gut microbiota composition significantly impacts bone response to particle radiation, with RM offering protective effects.
  • Targeting gut microbiota and IL-17 pathways presents a potential therapeutic strategy to mitigate radiation-induced bone loss.
  • Further translational research is warranted to explore dynamic microbiota changes in radiotherapy patients.