Abstract
Background
Epidemiological evidence has demonstrated a clear association between diabetes mellitus and increased risk of Alzheimer’s disease (AD). Cerebral accumulation of phosphorylated tau aggregates, a cardinal neuropathological feature of AD, is associated with neurodegeneration and cognitive decline. Clinical and experimental studies indicate that diabetes mellitus affects the development of tau pathology; however, the underlying molecular mechanisms remain unknown.
Objective
In the present study, we used a unique diabetic AD mouse model to investigate the changes in tau phosphorylation patterns occurring in the diabetic brain.
Design
Tau-transgenic mice were fed a high-fat diet (n = 24) to model diabetes mellitus. These mice developed prominent obesity, severe insulin resistance, and mild hyperglycemia, which led to early-onset neurodegeneration and behavioral impairment associated with the accumulation of hyperphosphorylated tau aggregates.
Results
Comprehensive phosphoproteomic analysis revealed a unique tau phosphorylation signature in the brains of mice with diabetic AD. Bioinformatic analysis of the phosphoproteomics data revealed putative tau-related kinases and cell signaling pathways involved in the interaction between diabetes mellitus and AD.
Conclusion
These findings offer potential novel targets that can be used to develop tau-based therapies and biomarkers for use in AD.
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Acknowledgments
This study was supported by Center for Medical Research and Education, Graduate School of Medicine, Osaka University. This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI grants, including a Grant-in-Aid for Young Scientists (A) (17H05080) and a Grant-in-Aid for Scientific Research (B) (21H02828) awarded to S.T., and a research grant from the Cell Science Research Foundation awarded to S.T.
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The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of data; in the preparation of the manuscript; or in the review or approval of the manuscript.
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Conflict of Interest Statement: The authors declare no conflicts of interest.
Ethical standards: All animal procedures were performed in Osaka University School of Medicine after the approval of the study protocol by the Animal Experiments Committee of Osaka University, Osaka, Japan (decision reference number 29-046-015). This study protocol was reviewed and approved by the Osaka University Living Modified Organisms (LMO) Research Safety Committee (approval number 04232). All animal experiments comply with the ARRIVE guidelines and were carried out in accordance with the National Institutes of Health Guide for the Care and Use of Laboratory Animals.
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Supplemental Information: High-fat diet-induced diabetic conditions exacerbate cognitive impairment in a mouse model of Alzheimer’s disease via a specific tau phosphorylation pattern
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Ito, Y., Takeda, S., Nakajima, T. et al. High-Fat Diet-Induced Diabetic Conditions Exacerbate Cognitive Impairment in a Mouse Model of Alzheimer’s Disease Via a Specific Tau Phosphorylation Pattern. J Prev Alzheimers Dis 11, 138–148 (2024). https://doi.org/10.14283/jpad.2023.85
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DOI: https://doi.org/10.14283/jpad.2023.85