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Impaired pattern separation in Tg2576 mice is associated with hyperexcitable dentate gyrus caused by Kv4.1 downregulation

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Authors
Kim, Kyung-Ran; Kim, Yoonsub; Jeong, Hyeon-Ju; Kang, Jong-Sun; Lee, Sang Hun; Kim, Yujin; Lee, Suk-Ho; Ho, Won-Kyung
Issue Date
2021-03-30
Publisher
BMC
Citation
Molecular Brain. 2021 Mar 30;14(1):62
Keywords
Tg2676Intrinsic excitabilityDentate gyrusKv4.1Alzheimer’s disease
Abstract
Alzheimers disease (AD) is a progressive neurodegenerative disorder that causes memory loss. Most AD researches have focused on neurodegeneration mechanisms. Considering that neurodegenerative changes are not reversible, understanding early functional changes before neurodegeneration is critical to develop new strategies for early detection and treatment of AD. We found that Tg2576 mice exhibited impaired pattern separation at the early preclinical stage. Based on previous studies suggesting a critical role of dentate gyrus (DG) in pattern separation, we investigated functional changes in DG of Tg2576 mice. We found that granule cells in DG (DG-GCs) in Tg2576 mice showed increased action potential firing in response to long depolarizations and reduced 4-AP sensitive K+-currents compared to DG-GCs in wild-type (WT) mice. Among Kv4 family channels, Kv4.1 mRNA expression in DG was significantly lower in Tg2576 mice. We confirmed that Kv4.1 protein expression was reduced in Tg2576, and this reduction was restored by antioxidant treatment. Hyperexcitable DG and impaired pattern separation in Tg2576 mice were also recovered by antioxidant treatment. These results highlight the hyperexcitability of DG-GCs as a pathophysiologic mechanism underlying early cognitive deficits in AD and Kv4.1 as a new target for AD pathogenesis in relation to increased oxidative stress.
ISSN
1756-6606
Language
English
URI
https://hdl.handle.net/10371/174440
DOI
https://doi.org/10.1186/s13041-021-00774-x
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Physiology (생리학교실)Journal Papers (저널논문_생리학교실)
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