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Quantification of γH2AX Foci in Response to Ionising Radiation
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Interaction between X-ray and alpha-particle damage in V79 cells.

N J McNally1, J de Ronde, M Folkard

  • 1Cancer Research Campaign Gray Laboratory, Mount Vernon Hospital, Northwood, Middlesex, U.K.

International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine
|June 1, 1988
PubMed
Summary

Alpha-particles, used in radiation therapy, can interact with X-ray damage in V79 cells. Priming doses of alpha-particles modify subsequent X-ray survival curves, reducing shoulder width and potentially enhancing cell kill.

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Area of Science:

  • Radiobiology
  • Cellular Radiation Response
  • DNA Damage and Repair

Background:

  • Understanding the interaction between different radiation types is crucial for optimizing radiotherapy.
  • Alpha-particles and X-rays induce DNA damage through distinct mechanisms.

Purpose of the Study:

  • To investigate the combined effects of alpha-particle and X-ray radiation on V79 cell survival.
  • To determine if alpha-particle radiation priming influences the response to subsequent X-ray exposure.

Main Methods:

  • V79 cells were exposed to single doses of X-rays or 238Pu alpha-particles.
  • Cells received priming doses of alpha-particles (0.5, 2, or 2.5 Gy) followed by X-ray exposure.
  • Cell survival curves were analyzed to assess radiation effects.

Main Results:

  • Alpha-particle exposure resulted in an exponential survival curve with a D0 of 0.89 Gy.
  • Priming with alpha-particles reduced the shoulder of the X-ray survival curve without altering its slope.
  • A high priming dose (2.5 Gy) of alpha-particles nearly eliminated the shoulder (Dq) of the subsequent X-ray survival curve.

Conclusions:

  • Alpha-particles induce damage that can interact with X-ray-induced damage in V79 cells.
  • The observed modification of X-ray survival curves suggests a potential for synergistic effects in combined radiation treatments.