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Kinetics of the Early Adaptive Response to Gamma Rays: Induction of a Cellular Radioprotective Mechanism in Murine Leukocytes In vivo

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Bioscience Reports

The aims of the study were to establish the kinetics of the early adaptive response and to determine the minimum adaptive dose of gamma rays capable of inducing this response. The minimum adaptive dose was determined by exposing groups of five BALB/c male mice to an adaptive dose of 0.005 or of 0.02 Gy γ rays from a 137Cs source and challenge with 1.0 Gy 60 min later. The kinetics of adaptive response induction was established by exposing mice to an adaptive dose of 0.01 Gy, and subsequently to a challenge dose of 1.0 Gy at different times. Blood samples were collected from the tail immediately after exposure to the challenge dose, and the percentage of DNA-damaged cells and the extent of damaged were determined by single cell gel electrophoresis in 300 leukocytes per animal in five mice. The results confirms the capability of an in vivo induction of an early radioprotective process against the DNA-damage produced by gamma rays in murine leukocytes, and allows us to conclude that the minimum adaptive dose lies between 0.005 and 0.01Gy of gamma rays, and the early adaptive response is induced as early as 30 min after the exposure and persists for at least 18 hr.

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  1. Departamento de Biología, Instituto Nacional de Investigaciones Nucleares, Apartado Postal, 18-1027, México, D.F., MEXICO

    Pedro Morales-Ramírez & María Teresa Mendiola-Cruz

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  1. Pedro Morales-Ramírez
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  2. María Teresa Mendiola-Cruz
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Correspondence to Pedro Morales-Ramírez.

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Morales-Ramírez, P., Mendiola-Cruz, M.T. Kinetics of the Early Adaptive Response to Gamma Rays: Induction of a Cellular Radioprotective Mechanism in Murine Leukocytes In vivo. Biosci Rep 24, 609–616 (2004). https://doi.org/10.1007/s10540-005-2795-7

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  • DOI: https://doi.org/10.1007/s10540-005-2795-7

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