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Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract
Published on: November 28, 2012
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Cataractogenesis following high-LET radiation exposure
Nobuyuki Hamada1, Tatsuhiko Sato2
1Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwado-kita, Komae, Tokyo 201-8511, Japan.
Mutation Research. Reviews in Mutation Research
|December 7, 2016
Summary
High-linear energy transfer (LET) radiation poses a significant risk for cataract development. Recent updates to radiation protection guidelines reflect a lower cataract threshold, emphasizing the need for further research into high-LET radiation cataractogenesis.
Area of Science:
- Radiation biology
- Ophthalmology
- Radiological protection
Background:
- Biological effectiveness of ionizing radiation varies with linear energy transfer (LET), with high-LET radiation being more potent for biological effects.
- The ocular lens is highly radiosensitive, and cataract formation is a deterministic effect with a threshold.
- Human exposure to high-LET radiation is relevant for specific occupations and space travel.
Purpose of the Study:
- To review current knowledge on high-LET radiation cataractogenesis.
- To update on changes in International Commission on Radiological Protection (ICRP) recommendations for ocular lens protection.
- To discuss future research needs in high-LET radiation cataractogenesis.
Main Methods:
- Review of epidemiological and biological findings on high-LET radiation cataractogenesis.
- Analysis of changes in ICRP recommendations regarding ocular lens radiation protection.
- Discussion of current understanding and future research directions.
Main Results:
- ICRP significantly lowered the threshold for radiation-induced cataracts from >8Gy to 0.5Gy in 2011.
- The occupational dose limit for the lens was reduced to 20mSv/year.
- Historically, the lens has been considered more vulnerable to high-LET radiation, necessitating specific protection factors.
Conclusions:
- A deeper understanding of high-LET radiation's cataractogenic potential is crucial due to the lens's radiosensitivity.
- Updated ICRP recommendations reflect a more cautious approach to lens radiation exposure.
- Further research is indispensable to refine radiation protection strategies for the ocular lens against high-LET radiation.
Keywords:
CataractCrystalline lensHigh-LET ionizing radiationRadiation weighting factorRelative biological effectivenessMore Related Videos
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