Cited by 42Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchAmino Acid Enzymes and Metabolism

Amyloid-beta peptide decreases expression and function of glutamate transporters in nervous system cells

Tong, Huichun, Zhang, Xiuping, Meng, Xingjun, Xu, Pingyi, Zou, Xiaoming, Qu, Shaogang·2017·The International Journal of Biochemistry & Cell Biology

Abstract

Glutamate is an essential excitatory neurotransmitter that regulates brain functions, and its activity is tightly regulated by glutamate transporters. Excess glutamate in the synaptic cleft and dysfunction of excitatory amino acid transporters have been shown to be involved in development of Alzheimer's disease, but the precise regulatory mechanism is poorly understood. Using a D-[ 3 H]-aspartic acid uptake assay, we found that Aβ 1-42 oligomers impaired glutamate uptake in astrocytes and neurons. In astrocytes, this process was accompanied by reduced expression of GLT-1 and GLAST as detected by Western blot and immunocytofluorescence. However, mRNA levels of EAATs detected by qPCR in astrocytes and neurons were not altered, which suggests that this process is post-translational. Co-localization analysis using immunocytofluorescence showed that ubiquitylation of GLT-1 significantly increased. Therefore, we hypothesized that Aβ 1-42 oligomers-induced endocytosis of astrocytic GLT-1 may be involved in ubiquitylation. In addition, Aβ 1-42 oligomers enhanced secretion of IL-1β, TNF-α, and IL-6 into culture supernatant, which may be correlated with an inflammatory response and altered EAATs expression or function in Alzheimer's disease. These findings support the idea that dysregulation of the glutamatergic system may play a significant role in pathogenesis of Alzheimer's disease. Furthermore, enhancing expression or function of EAATs in astrocytes and neurons might be a new thera…

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Crossref · 10.1016/j.biocel.2017.01.017

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Authors
Tong, H., Zhang, X., Meng, X., Xu, P., Zou, X., & Qu, S.
Affiliations
  • The First People's Hospital of Shunde (CN)
  • Southern Medical University (CN)
  • First Affiliated Hospital of Guangzhou Medical University (CN)
Corresponding author
  • Xu, Pingyi
  • Zou, Xiaoming
  • Qu, Shaogang
Venue
The International Journal of Biochemistry & Cell Biology
Publisher
Elsevier BV
Published
2017-04
Volume
85
Pages
75-84
ISSN
1357-2725 (ISSN-L)
OpenAlex
W2587701879
Cited by
42
References
73
Citations by year
2026: 4 · 2025: 8 · 2024: 6 · 2023: 4 · 2022: 3 · 2021: 5 · 2020: 5 · 2019: 2 · 2018: 2 · 2017: 2
FWCI
2.22
Type
journal article
Language
en
Open access
closed
Locations
  • The International Journal of Biochemistry & Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Natural Science Foundation of China (31570716, U1603281)
  • Science and Technology Planning Project of Guangdong Province (2012B050200003, 2013B021800305, 2016A050502025)
  • Science and Technology Planning Project of Guangzhou (2013J4500018, 2014J4100008)
  • Scientific and Technological Innovation Programs of the Higher Education Institution in Guangdong (2013KJCX0041)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
glutamate transporters, GLT-1, GLAST, astrocytes, neurons, glutamate uptake, ubiquitination, endocytosis, neuroinflammation, inflammatory cytokines, Alzheimer's disease, glutamatergic system
MeSH terms
Animals, Astrocytes, Cells, Cultured, Enzyme-Linked Immunosorbent Assay, Blotting, Western, Down-Regulation, Amyloid beta-Peptides, Vesicular Glutamate Transport Proteins, Mice

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