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Updated: Aug 9, 2026
10:10
Quantifying Cognitive Decrements Caused by Cranial Radiotherapy
Published on: October 18, 2011
Low-dose ionizing radiation and cognitive function: evidence, mechanisms, and controversies
Yuqiao Wang1, Weiwei Su2, Tao Wang1
1Department of Nuclear Medicine, the First Affiliated Hospital of Naval Medical University, Shanghai 200433, China.
Neuroscience
|August 4, 2026
Summary
Low-dose ionizing radiation (LDIR) exposure presents dual effects, causing neurotoxicity or offering neuroprotection through hormesis. Further research is needed to understand its mechanisms, safety, and clinical applications for cognitive disorders.
Area of Science:
- Neuroscience
- Radiation Biology
- Toxicology
Background:
- Humans face chronic exposure to ionizing radiation from natural and artificial sources.
- Low-dose ionizing radiation (LDIR) effects (<100 mSv) are controversial, with limited understanding of its dual neurotoxic and neuroprotective potential.
- Existing research primarily focuses on LDIR's neurotoxicity, including neuroinflammation, oxidative stress, and synaptic damage.
Purpose of the Study:
- To systematically review recent (5-year) studies on LDIR's detrimental and protective effects on the nervous system.
- To identify key factors modulating LDIR's impact, such as radiation parameters and biological characteristics.
- To explore the translational potential of LDIR as a non-pharmacological intervention for cognitive disorders.
Main Methods:
- Systematic literature review of studies published in the last five years.
- Integration of preclinical data and prospective clinical applications.
- Analysis of modulating factors including radiation parameters, biological characteristics, and socioeconomic variables.
Main Results:
- LDIR exhibits hormetic effects, potentially reducing Aβ deposition, promoting anti-inflammatory microglial polarization, and enhancing neurogenesis, thereby ameliorating cognitive impairment.
- Significant variability exists in study findings due to ethical constraints, sample size limitations, and inter-model differences.
- Key factors influencing LDIR outcomes include specific radiation parameters, biological characteristics, and socioeconomic variables.
Conclusions:
- LDIR possesses a dual mechanism, capable of inducing neurotoxicity or conferring neuroprotection via hormesis.
- Further research is essential to establish consensus on LDIR's safety thresholds, long-term outcomes, and optimal therapeutic regimens.
- Translational potential exists for LDIR in clinical settings for cognitive disorders, but barriers to implementation require addressing.
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