Proton Radiation Causes DNA Lesions and MicroRNA Dysregulation in Mice

Strategic Insights -

Research published in Molecular and Cellular Biochemistry has identified that proton particles, a form of ionizing radiation, can cause DNA lesions and alter microRNA (miRNA) expression in mice. The study, led by S.Y. Khan at the University of California, Santa Cruz, examined the effects of whole-body proton irradiation on miRNA expression in selected mouse organs. The findings suggest that proton radiation can disrupt miRNA regulation, leading to changes in gene expression and potentially contributing to cancer and tumor formation.

Key Takeaways:

  • Proton particles, a type of ionizing radiation, are abundant in outer space and can cause DNA lesions, leading to cancer and tumor formation.
  • The study used high-throughput small RNA sequencing to analyze miRNA expression in mouse organs exposed to whole-body proton irradiation (2 Gy).
  • The research found that specific miRNAs are vulnerable to proton radiation, and their expression profiles may depend on the tissue.
  • The study observed that more miRNAs are affected by proton radiation than previously thought.
  • The findings suggest that proton radiation can disrupt miRNA regulation, leading to changes in gene expression.
  • The study's results have implications for determining health risks to astronauts during space missions.

Statistics:

  • 2 Gy: The dose of whole-body proton irradiation used in the study.
  • 0 Gy: The control group exposure level.
  • ~22 nucleotides: The length of miRNAs, a class of non-coding RNAs that regulate gene expression.
  • Hundreds of gene targets: The number of genes that can be controlled by a single miRNA.

Sources:

  • Distinctive microRNA expression signatures in proton-irradiated mice. Molecular and Cellular Biochemistry, 2013;382(1-2):225-35.

(Springer - www.springer.com; Molecular and Cellular Biochemistry - www.springerlink.com/content/0300-8177/)

  • S.Y. Khan, Dept. of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, 95064, United States.
  • Additional authors: M.A. Tariq, J.P. Perrott, C.D. Brumbaugh, H.J. Kim, M.I. Shabbir, G.T. Ramesh, and N. Pourmand.

(Publisher: Springer, 233 Spring Street, New York, NY 10013, USA)