Abstract
Objectives
Type 2 diabetes mellitus (T2DM) increases the risk of brain atrophy and dementia. We aimed to elucidate deep grey matter (GM) structural abnormalities and their relationships with T2DM cognitive deficits by combining region of interest (ROI)-based volumetry, voxel-based morphometry (VBM) and shape analysis.
Methods
We recruited 23 T2DM patients and 24 age-matched healthy controls to undergo T1-weighted structural MRI scanning. Images were analysed using the three aforementioned methods to obtain deep GM structural shapes and volumes. Biochemical and cognitive assessments were made and were correlated with the resulting metrics.
Results
Shape analysis revealed that T2DM is associated with focal atrophy in the bilateral caudate head and dorso-medial part of the thalamus. ROI-based volumetry only detected thalamic volume reduction in T2DM when compared to the controls. No significant between-group differences were found by VBM. Furthermore, a worse performance of cognitive processing speed correlated with more severe GM atrophy in the bilateral dorso-medial part of the thalamus. Also, the GM volume in the bilateral dorso-medial part of the thalamus changed negatively with HbA1c.
Conclusions
Shape analysis is sensitive in identifying T2DM deep GM structural abnormalities and their relationships with cognitive impairments, which may greatly assist in clarifying the neural substrate of T2DM cognitive dysfunction.
Key Points
• Type 2 diabetes mellitus is accompanied with brain atrophy and cognitive dysfunction
• Deep grey matter structures are essential for multiple cognitive processes
• Shape analysis revealed local atrophy in the dorso-medial thalamus and caudatum in patients
• Dorso-medial thalamic atrophy correlated to cognitive processing speed slowing and high HbA1c.
• Shape analysis has advantages in unraveling neural substrates of diabetic cognitive deficits
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Abbreviations
- T2DM:
-
Type 2 diabetes
- cMRI:
-
Cranial magnetic resonance imaging
- GM:
-
Grey matter
- VBM:
-
Voxel-based morphometry
- ROI:
-
Region of interest
- MMSE:
-
Mini-Mental State Examination
- AVLT:
-
Auditory Verbal Learning Test
- ROCF:
-
Rey-Osterrieth Complex Figure
- TMT:
-
Trail Making Test
- TFCE:
-
Threshold free cluster enhancement
- AAM:
-
Active Appearance Model
- FBG:
-
Fasting blood glucose
- VST:
-
Victoria Stroop test
- SPM:
-
Statistical parametric mapping
- ICV:
-
Intracranial volume
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance
- PFC:
-
Prefrontal cortex
- Tem:
-
Temporal cortex
- Occ:
-
Occipital cortex
- Par:
-
Parietal lobe
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Acknowledgements
The authors thank all the volunteers who took part in the study.
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The scientific guarantor of this publication is Ziqian Chen.
Conflict of interest
The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
Funding
This study has received funding from the Major Project of the Nanjing Military Area Command of the Chinese PLA (project no. 14ZX23) and Natural Science Foundation of Fujian Province, China (project no. 2016 J01591).
Statistics and biometry
No complex statistical methods were necessary for this article.
Ethical approval
Institutional Review Board approval was obtained.
Informed consent
Written informed consent was obtained from all subjects (patients) in this study.
Methodology:
• Prospective
• Cross-sectional study
• Performed at one institution
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Chen, J., Zhang, J., Liu, X. et al. Abnormal subcortical nuclei shapes in patients with type 2 diabetes mellitus. Eur Radiol 27, 4247–4256 (2017). https://doi.org/10.1007/s00330-017-4790-3
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DOI: https://doi.org/10.1007/s00330-017-4790-3