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Liraglutide Ameliorates Hyperhomocysteinemia-Induced Alzheimer-Like Pathology and Memory Deficits in Rats via Multi-molecular Targeting

  • Yao Zhang
  • Jia-Zhao Xie
  • Xiang-Yang Xu
  • Jun Hu
  • Teng Xu
  • Si Jin
  • Shao-Juan Yang
  • Jian-Zhi WangEmail author
Original Article
  • 48 Downloads

Abstract

Hyperhomocysteinemia (Hhcy) is an independent risk factor for Alzheimer’s disease (AD), and insulin-resistance is commonly seen in patients with Hhcy. Liraglutide (Lir), a glucagon-like peptide that increases the secretion and sensitivity of insulin, has a neurotrophic or neuroprotective effect. However, it is not known whether Lir ameliorates the AD-like pathology and memory deficit induced by Hhcy. By vena caudalis injection of homocysteine to produce the Hhcy model in rats, we found here that simultaneous administration of Lir for 2 weeks ameliorated the Hhcy-induced memory deficit, along with increased density of dendritic spines and up-regulation of synaptic proteins. Lir also attenuated the Hhcy-induced tau hyperphosphorylation and Aβ overproduction, and the molecular mechanisms involved the restoration of protein phosphatase-2A activity and inhibition of β- and γ-secretases. Phosphorylated insulin receptor substrate-1 also decreased after treatment with Lir. Our data reveal that Lir improves the Hhcy-induced AD-like spatial memory deficit and the mechanisms involve the modulation of insulin-resistance and the pathways generating abnormal tau and Aβ.

Keywords

Liraglutide Hyperhomocysteinemia Glucagon-like peptide-1 receptor Tau β-Amyloid 

Notes

Acknowledgements

This work was supported by the National Key R&D Program of China, National Basic Research Development Program of the Ministry of Science and Technology of China (2016YFC1305800), the National Natural Science Foundation of China (31730035, 91632305, and 81721005), and the Integrated Innovation Team for Major Human Disease Program of Tongji Medical College, Huazhong University of Science and Technology, China.

Conflict of interest

The authors claim that there are no conflicts of interest.

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Copyright information

© Shanghai Institutes for Biological Sciences, CAS 2019

Authors and Affiliations

  • Yao Zhang
    • 1
  • Jia-Zhao Xie
    • 2
  • Xiang-Yang Xu
    • 4
  • Jun Hu
    • 3
  • Teng Xu
    • 3
  • Si Jin
    • 3
  • Shao-Juan Yang
    • 3
  • Jian-Zhi Wang
    • 2
    Email author
  1. 1.Endocrinology Department of Liyuan Hospital and Key Laboratory of the Ministry of Education of China for Neurological Disorders, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
  2. 2.Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of the Ministry of Education of China for Neurological Disorders, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
  3. 3.Endocrinology Department, Liyuan Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
  4. 4.Radiology Department, Liyuan Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

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