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Type 2 diabetes and cognitive impairment: linking mechanisms
1Division of General Medicine, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA. jal94@columbia.edu
Journal of Alzheimer'S Disease : JAD
|March 22, 2012
Summary
Type-2-diabetes (T2D) is linked to cognitive impairment, primarily through cerebrovascular disease. Further research is needed to confirm if T2D also causes Alzheimer's disease and understand the underlying mechanisms.
Area of Science:
- Neuroscience
- Endocrinology
- Public Health
Background:
- Type-2-diabetes (T2D) is a global epidemic with potential links to cognitive decline.
- Existing research suggests T2D may contribute to cerebrovascular disease, leading to vascular cognitive impairment (VCI).
- The relationship between T2D and late-onset Alzheimer's disease (LOAD) remains less clear.
Purpose of the Study:
- To review current concepts on mechanisms linking T2D and cognitive impairment.
- To evaluate the evidence for T2D causing VCI versus LOAD.
- To highlight the need for further research into the causal relationship and mechanisms.
Main Methods:
- Review of epidemiologic studies.
- Analysis of neuroimaging findings.
- Examination of autopsy study results.
- Assessment of clinical trial evidence.
Main Results:
- Strong evidence suggests T2D causes cerebrovascular disease and VCI.
- The link between T2D and LOAD is less certain, with imaging data potentially explained by vascular factors.
- Autopsy studies present conflicting evidence regarding cerebrovascular versus neurodegenerative mechanisms.
- Clinical trial data is currently mixed, with key trials ongoing.
Conclusions:
- Cerebrovascular disease appears to be the primary mechanism linking T2D to cognitive impairment.
- The causal role of T2D in LOAD requires further investigation.
- Elucidating the precise mechanisms is crucial given the prevalence of T2D.
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