Abstract
Objectives
Higher static magnetic field (SMF) enables higher imaging capability in magnetic resonance imaging (MRI), which encourages the development of ultra-high field MRIs above 20 T with a prerequisite for safety issues. However, animal tests of ≥ 20 T SMF exposure are very limited. The objective of the current study is to evaluate mice behaviour consequences of 3.5–23.0 T SMF exposure.
Methods
We systematically examined 112 mice for their short- and long-term behaviour responses to a 2-h exposure of 3.5–23.0 T SMFs. Locomotor activity and cognitive functions were measured by five behaviour tests, including balance beam, open field, elevated plus maze, three-chamber social recognition, and Morris water maze tests.
Results
Besides the transient short-term impairment of the sense of balance and locomotor activity, the 3.5–23.0 T SMFs did not have long-term negative effects on mice locomotion, anxiety level, social behaviour, or memory. In contrast, we observed anxiolytic effects and positive effects on social and spatial memory of SMFs, which is likely correlated with the significantly increased CaMKII level in the hippocampus region of high SMF-treated mice.
Conclusions
Our study showed that the short exposures to high-field SMFs up to 23.0 T have negligible side effects on healthy mice and may even have beneficial outcomes in mice mood and memory, which is pertinent to the future medical application of ultra-high field SMFs in MRIs and beyond.
Key Points
• Short-term exposure to magnetic fields up to 23.0 T is safe for mice.
• High-field static magnetic field exposure transiently reduced mice locomotion.
• High-field static magnetic field enhances memory while reduces the anxiety level.
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Abbreviations
- Arc:
-
Apoptosis repressor with CARD
- CaMKII:
-
Ca2+/calmodulin-dependent protein kinase II
- cm/sec:
-
Average velocity
- EPM:
-
Elevated plus maze
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- IOD:
-
Integrated optical density
- MRI:
-
Magnetic resonance imaging
- MWM:
-
Morris water maze
- NMDAR1:
-
N-Methyl-d-aspartate receptor subunit 1
- OFT:
-
Open field test
- SDS:
-
Sodium dodecyl sulfate
- SMF:
-
Static magnetic field
- T:
-
Unit of magnetic field intensity: Tesla
- TBST:
-
Tris-buffered saline with Tween
- TMS:
-
Transcranial magnetic stimulation
- UHF-MRI:
-
Ultra-high field MRI
- USTC:
-
University of Science and Technology of China
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Acknowledgements
We would like to thank the staff members in the High Magnetic Field Laboratory, Chinese Academy of Sciences, for their technical assistance, and Shu-tong Maggie Wang for cartoon illustration.
Funding
This study has received funding from the National Key R&D Program of China (2016YFA0400900) to Xin Zhang and Tian Xue; National Natural Science Foundation of China (U21A20148), the CASHIPS Director’s Fund (BJPY2021A06, 2021YZGH04) to Xin Zhang; National Natural Science Foundation of China (52007185) to Xiaofei Tian; National Natural Science Foundation of China (U20A2017 and 32071020), Guangdong Basic and Applied Basic Research Foundation (2020B1515120014), and Shenzhen Key Laboratory of Drug Addiction (ZDSYS20190902093601675) to Jin Bao; and CAS Project for Young Scientists in Basic Research (YSBR-013) to Tian Xue and international collaboration grant (211134KYSB20190122) to Jin Bao.
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The scientific guarantor of this publication is Dr. Xin Zhang.
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Some study subjects have been previously reported in Neuroimage. 2019. 199. 273-280.
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Khan, M.H., Huang, X., Tian, X. et al. Short- and long-term effects of 3.5–23.0 Tesla ultra-high magnetic fields on mice behaviour. Eur Radiol 32, 5596–5605 (2022). https://doi.org/10.1007/s00330-022-08677-8
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DOI: https://doi.org/10.1007/s00330-022-08677-8