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Accelerated heavy particles and the lens II. Cytopathological changes
Investigative Ophthalmology & Visual Science
|January 1, 1986
Summary
Accelerated Argon (40Ar) ions cause similar cytopathological effects to x-rays in rat lenses. The relative biological effectiveness (RBE) for Argon ions in causing lens disorganization increases with decreasing dose, similar to cataractogenesis.
Area of Science:
- Radiation biology
- Ophthalmology
- Space medicine
Background:
- Assessing risks of heavy particle radiation exposure is crucial for space programs and radiotherapy.
- Understanding cytopathological effects on normal tissues, like the rat lens, is essential for risk assessment.
Purpose of the Study:
- To investigate the cytopathological effects of accelerated Argon (40Ar) ions on the rat lens.
- To compare the effects of Argon ions with x-rays and determine the relative biological effectiveness (RBE).
Main Methods:
- Rats were exposed to varying doses of accelerated Argon (40Ar) ions (570 MeV/amu).
- Time-course analyses examined mitotic index, nuclear fragmentation, and meridional row (MR) cytoarchitecture.
- Lens epithelium effects were assessed 67 weeks post-irradiation.
Main Results:
- Argon ion effects on mitotic index, nuclear fragmentation, and MR cytoarchitecture were qualitatively similar to x-rays at a 1 Gy dose.
- The mitotic index returned to normal levels by 67 weeks post-irradiation.
- The RBE of 40Ar ions relative to x-rays for MR disorganization increased with decreasing dose, mirroring RBE for cataractogenesis.
Conclusions:
- Radiation cataracts are likely caused by damage to the lens epithelial population.
- Aberrant differentiation during fibergenesis is the mechanism for radiation-induced cataract formation.
- Argon ions pose a significant risk to normal tissues, particularly the lens, in space and radiotherapy settings.