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Updated: Jan 30, 2026

Evaluation of the Spatial Distribution of γH2AX following Ionizing Radiation
Published on: August 7, 2010
Ionizing radiation and bone quality: time-dependent effects
Pedro Henrique Justino Oliveira Limirio1, Priscilla Barbosa Ferreira Soares1, Eduardo Tadashi Pinto Emi1
1Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil.
Background:
The aim of this study was to evaluate the ionizing radiation (IR) effects on rat bone 30 and 60 days after irradiation.
Methods:
Wistar rats were submitted to IR (30 Gy) on the left leg and were euthanized after 30 and 60 days. The legs were divided into four groups according to the treatment and euthanization time: C30 and C60 (right leg-without IR), IR30 and IR60 (left leg-with IR).
Results:
CT analysis showed more radiodensity in C60 compared with other groups, and IR60 showed more radiodensity than IR30. In histomorphometric analysis, C30 showed lower bone matrix values compared with IR30 and C60. Lacunarity analyses showed more homogeneous bone channel distribution in C30 than IR30. ATR-FTIR showed decrease in ratio of mature and immature crosslinks in IR30 compared with C30. Crystallinity Index was decrease in IR60 compared with C60. The Amide III + Collagen/HA ratio was increased in C60 compared with C30; however this ratio decreased in IR60 compared with IR30. Biomechanical analysis showed lower values in IR groups in both time.
Conclusions:
IR damaged bone quality and decreased stiffness. Moreover, the results suggested that the deleterious effects of IR increased in the late time points.
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