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Age-dependent increases in tau phosphorylation in the brains of type 2 diabetic rats correlate with a reduced expression of p62.
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- Author(s): Jung HJ;Jung HJ; Kim YJ; Eggert S; Chung KC; Choi KS; Park SA
- Source:
Experimental neurology [Exp Neurol] 2013 Oct; Vol. 248, pp. 441-50. Date of Electronic Publication: 2013 Jul 29.- Publication Type:
Journal Article; Research Support, Non-U.S. Gov't- Language:
English - Source:
- Additional Information
- Source: Publisher: Academic Press Country of Publication: United States NLM ID: 0370712 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1090-2430 (Electronic) Linking ISSN: 00144886 NLM ISO Abbreviation: Exp Neurol Subsets: MEDLINE
- Publication Information: Publication: Orlando Fl : Academic Press
Original Publication: New York. - Subject Terms: Aging/*metabolism ; Brain/*metabolism ; Diabetes Mellitus, Type 2/*metabolism ; Heat-Shock Proteins/*metabolism ; tau Proteins/*metabolism; Age Factors ; Animals ; Diabetes Mellitus, Type 2/complications ; Disease Models, Animal ; Epitopes ; Neurons/metabolism ; Obesity/complications ; Obesity/metabolism ; Phosphorylation ; Rats ; Sequestosome-1 Protein ; Signal Transduction/physiology
- Abstract: Aging increases the co-incidence of Alzheimer's disease (AD) and type 2 diabetes (T2DM). However, the critical factors that contribute to the age-related increase in AD-T2DM comorbidity have yet to be clarified. In this study, aging effects and their relationship to AD-related pathology and T2DM as well as the underlying mechanisms of this process were investigated using obese rats with chronic T2DM. Tau pathology and its associated signaling pathways in the brain were compared between Otsuka Long-Evans Tokushima Fatty (OLETF) rats and corresponding non-diabetic controls at various ages. Tau phosphorylation at AD-related epitopes, including Thr212, Thr231, Ser262, and Ser396, increased with age in the soluble brain extracts of chronic OLETF rats and were accompanied by synaptic protein loss. There was also a marked age-dependent accumulation of polyubiquitinated substances in diabetic rats. Accordingly, tau proteins were highly polyubiquitinated in aged OLETF rats and a strong degree of co-localization existed between p-tau and ubiquitin in these neurons. In addition, the mRNA and protein levels of p62, a known cargo molecule that transports polyubiquitinated tau to proteasomal and autophagic degradation systems, decreased robustly with age in OLETF rats and there was an inverse correlation between protein levels of p62 and p-tau. The impaired degradation of polyubiquitinated p-tau due to age- and T2DM-dependent decreases in p62 transcription is a primary mechanism underlying increased AD-like pathology in a T2DM rat model as age increases. These results provide novel insight into the mechanisms supporting the age-related increase in AD-T2DM comorbidity.
(© 2013.) - Contributed Indexing: Keywords: AD; Aging; Alzheimer's disease; BSA; Bcl-2-interacting protein-1; Beclin-1; CDK5; CYPA; CaMKII; LC3B; LETO; Long–Evans Tokushima Otsuka; NBR1; OLETF; Otsuka Long–Evans Tokushima Fatty; PBS containing 0.2% Triton X-100; PBST; SDS; T2DM; TBS; Tau; Tris-buffered saline; Type 2 diabetes; UPS; Ubiquitin; bovine serum albumin; calcium/calmodulin-dependent protein kinase II; cyclin dependent kinase 5; cyclophilin A; glycogen synthase kinase-3β; microtubule-associated protein 1 light chain 3; neighbor of BRAC1 gene 1; p62; pGSK3β; pPP2A; protein phosphatase 2; sodium dodecyl sulfate; type 2 diabetes; ubiquitin–proteasome system
- Accession Number: 0 (Epitopes)
0 (Heat-Shock Proteins)
0 (Sequestosome-1 Protein)
0 (Sqstm1 protein, rat)
0 (tau Proteins) - Publication Date: Date Created: 20130803 Date Completed: 20131127 Latest Revision: 20220309
- Publication Date: 20231215
- Accession Number: 10.1016/j.expneurol.2013.07.013
- Accession Number: 23906983
- Source:
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