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Adaptive response: modelling and experimental studies.

G Esposito1, A Campa, M Pinto

  • 1Health and Technology Department, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Roma, Italy. giuseppe.esposito@iss.infn.it

Radiation Protection Dosimetry
|December 17, 2010
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Summary
This summary is machine-generated.

Adaptive response (AR) protects cells from high radiation doses. This study models AR, finding it depends on DNA repair, antioxidant enzymes, and cell density, and occurs within specific dose ranges and timeframes.

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Area of Science:

  • Radiobiology
  • Cellular and Molecular Biology
  • Radiation Oncology

Background:

  • Adaptive response (AR) describes reduced cell damage from a high radiation dose after a low priming dose.
  • Proposed AR mechanisms include enhanced DNA repair and antioxidant enzyme induction.

Purpose of the Study:

  • To model adaptive response (AR) using an extended lethal-potentially lethal (LPL) model.
  • To investigate the influence of dose, dose rate, time, and cell density on AR.

Main Methods:

  • Developed a mathematical model extending the LPL model with dynamic variables for DNA repair efficiency, radical levels, and antioxidant enzymes.
  • Conducted experimental studies using AG1522 cells at sparse and confluent densities subjected to gamma irradiation.

Main Results:

  • The model successfully describes the protective effect of a priming radiation dose.
  • Simulations confirmed AR occurs within specific priming dose and dose-rate ranges and requires at least 4 hours to develop.
  • Experimental results indicated that cell density is critical for observing AR.

Conclusions:

  • The proposed model accurately simulates adaptive response (AR) phenomena.
  • Cell-cell communication, influenced by cell density, plays a significant role in adaptive response.
  • AR is a complex process influenced by multiple factors including radiation parameters and cellular environment.