Cited by 50Alzheimer's disease research and treatmentsCaveolin-1 and cellular processesDementia and Cognitive Impairment Research

High glucose induces formation of tau hyperphosphorylation via Cav-1-mTOR pathway: A potential molecular mechanism for diabetes-induced cognitive dysfunction

Open access
Wu, Jing, Zhou, Shan-Lei, Pi, Lin-Hua, Shi, Xia-Jie, Ma, Ling-Ran, Chen, Zi, Qu, Min-Li, Li, Xin +4 more·2017·Oncotarget

Abstract

// Jing Wu 1 , Shan-Lei Zhou 1 , Lin-Hua Pi 1 , Xia-Jie Shi 1 , Ling-Ran Ma 2 , Zi Chen 1 , Min-Li Qu 1 , Xin Li 2 , Sheng-Dan Nie 3 , Duan-Fang Liao 4 , Jin-Jing Pei 5, 6, 7 and Shan Wang 1, 2 1 Department of Endocrinology, Xiang-Ya Hospital, Central South University, Changsha, Hunan, China 2 Department of Pharmaceutical Engineering, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, China 3 Institute of Clinical Medicine, People’s Hospital of Hunan Province, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China 4 Division of Stem Cell Regulation and Application, School of Pharmacy, Hunan University of Traditional Chinese Medicine, Changsha, Hunan, China 5 KI-Alzheimer’s Disease Research Center, Karolinska Institutet, Novum, Stockholm, Sweden 6 Department of Neurology, Xuan Wu Hospital, Capital Medical University, Xicheng, Beijing, China 7 Center of Alzheimer’s Disease, Beijing Institute for Brain Disorders, Beijing, China Correspondence to: Shan Wang, email: wangshancsu0717@163.com Jing Wu, email: wujing0731@163.com Keywords: diabetes mellitus, cognitive dysfunction, caveolin-1, tau hyperphosphorylation, mTOR Received: February 20, 2017 Accepted: April 07, 2017 Published: April 19, 2017 ABSTRACT The abnormally hyperphosphorylated tau is thought to be implicated in diabetes-associated cognitive deficits. The role of mammalian target of rapamycin (mTOR) / S6 kinase (S6K) signalling in the formation of tau hyperphosphorylation has been previously studied. Caveolin-1 (Cav-1), the essential structure protein of caveolae, promotes neuronal survival and growth, and inhibits glucose metabolism. In this study, we aimed to investigate the role of Cav-1 in the formation of tau hyperphosphorylation under chronic hyperglycemic condition (HGC). Diabetic rats were induced by streptozotocin (STZ). Primary hippocampal neurons with or without molecular intervention such as the transient over-expression or knock-down were subjected to HGC. The obtained experimental samples were analyzed by real time quantitative RT-PCR, Western blot, immunofluorescence or immunohistochemisty. We found: 1) that a chronic HGC directly decreases Cav-1 expression, increases tau phosphorylation and activates mTOR/S6K signalling in the brain neurons of diabetic rats, 2) that overexpression of Cav-1 attenuates tau hyperphosphorylation induced by chronic HGC in primary hippocampal neurons, whereas down-regulation of Cav-1 using Cav-1 siRNA dramatically worsens tau hyperphosphorylation via mTOR/S6K signalling pathway, and 3) that the down-regulation of Cav-1 induced by HGC is independent of mTOR signalling. Our results suggest that tau hyperphosphorylation and the sustained over-activated mTOR signalling under hyperglycemia may be due to the suppression of Cav-1. Therefore, Cav-1 is a potential therapeutic target for diabetes-induced cognitive dysfunction.

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  1. [53]Planel E Tatebayashi Y Miyasaka T Liu L Wang L Herman M Yu WH Luchsinger JA Wadzinski B Duff KE Takashima A Insulin dysfunction induces in vivo tau hyperphosphorylation through distinct mechanisms J Neurosci 2007 27 13635 13648 18077675 PMC6673606

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Authors
Wu, J., Zhou, S.-L., Pi, L.-H., Shi, X.-J., Ma, L.-R., Chen, Z., Qu, M.-L., Li, X., Nie, S.-D., Liao, D.-F., Pei, J.-J., & Wang, S.
Affiliations
  • Central South University (CN)
  • Department of Endocrinology, Xiang-Ya Hospital, Central South University, Changsha, Hunan, China
  • Institute of Clinical Medicine, People's Hospital of Hunan Province, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
  • Hunan University of Traditional Chinese Medicine (CN)
  • Capital Medical University (CN)
Venue
Oncotarget
Published
2017-04-19
Volume
8
Issue
25
Pages
40843-40856
ISSN
1949-2553 (ISSN-L)
OpenAlex
W2607382890
Cited by
50
References
86
Citations by year
2026: 4 · 2025: 7 · 2024: 6 · 2023: 7 · 2022: 8 · 2021: 5 · 2020: 7 · 2019: 2 · 2018: 3 · 2017: 1
FWCI
2.63
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Oncotarget (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Caveolin-1 and cellular processes
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
tau hyperphosphorylation, caveolin-1, mTOR signaling, S6 kinase, high glucose, hyperglycemia, hippocampal neurons, streptozotocin-induced diabetes, Alzheimer's disease, neurodegeneration, caveolae, neuroprotection, neuroinflammation, oxidative stress, autophagy
MeSH terms
Animals, Diabetes Mellitus, Experimental, Glucose, Hyperglycemia, Male, Phosphorylation, Transfection, tau Proteins, Rats, Sprague-Dawley, Caveolin 1, Rats, TOR Serine-Threonine Kinases, Cognitive Dysfunction

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