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Updated: Jun 11, 2026
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Simultaneous PET/MRI Imaging During Mouse Cerebral Hypoxia-ischemia
Published on: September 20, 2015
Cerebral and functional adaptation with chronic hypoxia exposure: a multi-modal MRI study
Xiaodan Yan1, Jiaxing Zhang, Jinfu Shi
1Laboratory for Higher Brain Function, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China.
Brain Research
|July 6, 2010
Summary
High altitude (HA) living causes brain structure and function changes in young adults, impacting gray matter volume and resting-state brain activity. These modifications correlate with poorer working memory performance.
Area of Science:
- Neuroscience
- Altitude Physiology
- Medical Imaging
Background:
- Chronic high altitude (HA) exposure presents unique physiological challenges.
- Understanding brain adaptations to HA hypoxia is crucial for immigrant health.
- Previous research indicates potential neurological effects of HA living.
Purpose of the Study:
- To investigate structural and functional brain differences between high altitude (HA) natives and sea level (SL) controls.
- To assess the impact of HA hypoxia on gray matter volume, white matter integrity, and resting-state brain activity.
- To correlate brain alterations with working memory performance in HA individuals.
Main Methods:
- Multi-modal MRI scans (VBM, DAI FA, BOLD-fMRI ReHo) were acquired from 28 HA young adults and 28 SL controls.
- Regional gray matter volumes were compared between groups.
- White matter integrity (Diffusion Anisotropy Imaging Fractional Anisotropy) and resting-state brain activity (Regional Homogeneity) were analyzed.
- Working memory tasks were administered, and performance was correlated with brain imaging metrics.
Main Results:
- HA residents exhibited reduced gray matter volume in the anterior insula, prefrontal cortex, precentral, cingulate, and lingual cortex.
- Altered white matter integrity (FA values) and resting-state activity (ReHo) were observed in HA individuals.
- Relocation to sea level (SL) was associated with increased resting-state activity in the hippocampus and right insula.
- Poorer working memory performance in HA subjects was linked to ReHo values in specific brain regions.
Conclusions:
- Chronic high altitude hypoxia induces significant cerebral and functional modifications.
- Brain structure and activity changes in HA natives may underlie cognitive deficits, particularly in working memory.
- These findings highlight the brain's plasticity in response to environmental hypoxia.
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