The response of Chinese hamster V79-379A cells exposed to negative Pi- mesons

Evidence that increased radioresistance is dependent on linear energy transfer

Brian Marples, G. K.Y. Lam, H. Zhou, K. A. Skov

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Chinese hamster V79-379A cells exhibit low-dose hypersensitivity to 250 kVp X rays followed by an increased radioresistant response over the dose range 0.5-1 Gy. This phenomenon is not seen with neutrons (Marples and Joiner, Radiat. Res. 133, 41-51, 1993). It was therefore postulated the induction of radioresistance might develop as a response to a cellular event(s) which predominates after low- and not high-LET radiation. To test this hypothesis, we measured the survival response of V79-379A cells exposed to pions. Clonogenic survival was assessed for cells irradiated in the Bragg peak (35 keV/μm) and plateau region (10-20 keV/μm) of the beam, using an automated microscope (DMIPS cell analyzer). As expected, peak pions were found to be more effective per unit of dose at killing cells than plateau pions. The survival curve for cells irradiated in the plateau of the pion beam was found to incorporate a region of low-dose hypersensitivity and increased radioresistance, the effective D0 was dose-dependent, ranging from 3.5-5. This was not seen with peak pions, where the effective D0 was, on average, constant reflecting a single-exponential survival curve. Fitting the data with an induced repair model indicates that the phenomenon of increased radioresistance is almost certainly dependent on LET.

Original languageEnglish (US)
JournalRadiation Research
Volume138
Issue number1 SUPPL.
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

Fingerprint

Mesons
Linear Energy Transfer
linear energy transfer (LET)
hamsters
Cricetulus
mesons
pions
dosage
plateaus
cells
Hypersensitivity
pion beams
Neutrons
curves
analyzers
Cell Survival
induction
microscopes
X-Rays
Radiation

ASJC Scopus subject areas

  • Biophysics
  • Radiation
  • Radiology Nuclear Medicine and imaging

Cite this

The response of Chinese hamster V79-379A cells exposed to negative Pi- mesons : Evidence that increased radioresistance is dependent on linear energy transfer. / Marples, Brian; Lam, G. K.Y.; Zhou, H.; Skov, K. A.

In: Radiation Research, Vol. 138, No. 1 SUPPL., 01.01.1994.

Research output: Contribution to journalArticle

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