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DOSE-RESPONSE STUDY USING MICRONUCLEUS CYTOME ASSAY: A TOOL FOR BIODOSIMETRY APPLICATION.

Rajesha K Nairy1, Nagesh N Bhat2, Ganesh Sanjeev3

  • 1Depatment of Physics, P.A College of Engineering, Mangalore 574 153, Karnataka, India.

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|March 20, 2016
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Summary

This study evaluated micronuclei (MN) and nucleoplasmic bridges (NPBs) in human lymphocytes exposed to gamma rays and electron beams. Results show a linear-quadratic dose response, validating NPBs for biodosimetry.

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Area of Science:

  • Radiation biology
  • Cytogenetics
  • Biophysics

Background:

  • Micronucleus (MN) formation is a recognized biomarker for genotoxicity and radiation exposure.
  • Nucleoplasmic bridges (NPBs) are also observed following DNA damage and may serve as a biodosimetry endpoint.
  • Standardization of biodosimetry techniques is crucial for accurate radiation dose assessment.

Purpose of the Study:

  • To generate in vitro dose-response data for MN and NPBs induction in human lymphocytes.
  • To assess the potential of NPBs as a novel biodosimetry endpoint.
  • To compare the biological effectiveness of 60Co-gamma rays and an 8 MeV pulsed electron beam.

Main Methods:

  • Human lymphocytes were exposed to varying doses (0-6 Gy) of 60Co-gamma rays and 8 MeV pulsed electron beam.
  • A total of 1000 binucleated cells (BNCs) per dose point were analyzed.
  • Frequencies of MN and NPBs were quantified to establish dose-response relationships.

Main Results:

  • Both MN and NPBs showed a linear-quadratic dose-response relationship with radiation exposure.
  • The study provides linear and quadratic parameters for biodosimetry applications.
  • The relative biological effectiveness (RBE) of the 8 MeV electron beam was estimated, with values ranging from 1.09 to 1.27 depending on the endpoint.

Conclusions:

  • NPBs show promise as a reliable biodosimetry endpoint, comparable to MN.
  • The established dose-response data supports the use of both MN and NPBs for radiation dose assessment.
  • The RBE values indicate the biological effectiveness of the pulsed electron beam relative to gamma rays.