4.7 Article

Altered synaptic glutamate homeostasis contributes to cognitive decline in young APP/PSEN1 mice

期刊

NEUROBIOLOGY OF DISEASE
卷 158, 期 -, 页码 -

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2021.105486

关键词

Alzheimer's disease; Glutamate; Memory; Behavior; Mouse; EEG; Electrophysiology

资金

  1. Department of Veterans Affairs, Veterans Health Administration, Office of Research and Development, (VA Merit Review) [I01 CX001610]
  2. Vanderbilt Interdisciplinary Training Program in Alzheimer's Disease [T32 AG058524]
  3. Vanderbilt Training Program in Environmental Toxicology [T32 ES007028]
  4. American Epilepsy Society
  5. National Institute for Neurologic Disease and Stroke's Center for SUDEP Research (CSR)
  6. Vanderbilt Faculty Research Scholars award
  7. Vanderbilt Kennedy Center [P50 HD103537]
  8. [U2C DK059637]

向作者/读者索取更多资源

Repeated low-dose kainic acid treatment triggered non-convulsive epileptiform activity in APP/PSEN1 mice, leading to memory impairment and hippocampal long-term potentiation deficits. The high excitability in Alzheimer's disease may contribute to cognitive decline independently of beta-amyloid-plaque load, especially in younger mice without plaques.
Non-convulsive epileptiform activity is a common and under-studied comorbidity of Alzheimer's disease that may significantly contribute to onset of clinical symptoms independently of other neuropathological features such as beta-amyloid deposition. We used repeated treatment with low dose kainic acid (KA) to trigger subthreshold epileptiform activity in young (less than 6 months) wild-type (WT) and APP/PSEN1 mice to test the role of disruption to the glutamatergic system in epileptiform activity changes and the development of memory deficits. Short-term repeated low-dose KA (five daily treatments with 5 mg/kg, IP) impaired long-term potentiation in hippocampus of APP/PSEN1 but not WT mice. Long-term repeated low-dose KA (fourteen weeks of biweekly treatment with 7.5-10 mg/kg) led to high mortality in APP/PSEN1 mice. KA treatment also impaired memory retention in the APP/PSEN1 mice in a Morris water maze task under cognitively challenging reversal learning conditions where the platform was moved to a new location. Four weeks of bi-weekly treatment with 5 mg/kg KA also increased abnormal spike activity in APP/PSEN1 and not WT mice but did not impact sleep/wake behavioral states. These findings suggest that hyperexcitability in Alzheimer's disease may indeed be an early contributor to cognitive decline that is independent of heavy beta-amyloid-plaque load, which is absent in APP/ PSEN1 mice under 6 months of age.

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