Interaction between APOE genotype and diabetes in cognitive decline
Mitsuru Shinohara1,2,3, Yoshitaka Tashiro1, Kaoru Suzuki1
1Department of Aging Neurobiology Center for Development of Advanced Medicine for Dementia National Center for Geriatrics and Gerontology Obu Aichi Japan.
Alzheimer'S & Dementia (Amsterdam, Netherlands)
|March 27, 2020
Summary
Diabetes accelerates cognitive decline in non-APOE ε4 carriers by worsening vascular issues. This effect is minimal in APOE ε4 carriers, who already face high vascular impairment risks.
Area of Science:
- Neuroscience
- Genetics
- Endocrinology
Background:
- Diabetes and apolipoprotein E (apoE) are known dementia risk factors.
- The interplay between diabetes, apoE genotype, and dementia risk requires further clarification.
Purpose of the Study:
- To investigate how diabetes influences cognitive decline based on APOE genotype.
- To explore the relationship between diabetes, APOE genotype, and neuropathology.
Main Methods:
- Analysis of National Alzheimer's Coordinating Center (NACC) clinical records.
- Examination of cognitive decline patterns in relation to diabetes and APOE genotype.
- Assessment of neuropathological markers, specifically vascular pathology.
Main Results:
- A significant interaction was found between diabetes and APOE genotype.
- Diabetes exacerbated cognitive decline in APOE3 and APOE2 carriers, but not APOE4 carriers.
- Diabetes increased vascular pathology in APOE3 carriers; APOE4 carriers showed high levels regardless of diabetes status.
Conclusions:
- Diabetes accelerates cognitive decline, particularly in non-APOE ε4 carriers, by promoting vascular impairment.
- APOE4 carriers are less affected by diabetes-induced cognitive decline due to pre-existing vascular vulnerability.
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