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Sirtuin-2 inhibition affects hippocampal functions and sodium butyrate ameliorates the reduction in novel object memory, cell proliferation, and neuroblast differentiation

Laboratory Animal Research volume 32, pages 224–230 (2016)Cite this article

Abstract

We investigated the effects of the sirtuin-2 (SIRT2) inhibitor AK-7 on novel object memory, cell proliferation, and neuroblast differentiation in the dentate gyrus. In addition, we also observed the relationships with sodium butyrate, a histone deacetylase inhibitor, on the hippocampal functions. To investigate the effects of AK-7 on hippocampal functions, 10-week-old C57BL/6 mice were daily injected intraperitoneally with 20 mg/kg AK-7 alone or in combination with subcutaneous administration of 300 mg/kg sodium butyrate, a histone deacetylase inhibitor, for 21 days. A novel object recognition test was conducted on days 20 (training) and 21 (testing) of treatment. Thereafter, the animals were sacrificed for immunohistochemistry for Ki67 (cell proliferation) and doublecortin (DCX, neuroblast differentiation). AK-7 administration significantly reduced the time spent exploring new objects, while treatment in combination with sodium butyrate significantly alleviated this reduction. Additionally, AK-7 administration significantly reduced the number of Ki67-positive cells and DCX-immunoreactive neuroblasts in the dentate gyrus, while the treatment in combination with sodium butyrate ameliorated these changes. This result suggests that the reduction of SIRT2 may be closely related to age-related phenotypes including novel object memory, as well as cell proliferation and neuroblast differentiation in the dentate gyrus. In addition, sodium butyrate reverses SIRT2-related age phenotypes.

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Authors and Affiliations

  1. Department of Anatomy and Cell Biology, College of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea

    Hyo Young Jung, Dae Young Yoo, Jong Whi Kim, Yeo Sung Yoon & In Koo Hwang

  2. Department of Biochemistry and Molecular Biology, Research Institute of Oral Sciences, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea

    Dae Won Kim

  3. Department of Anatomy, College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea

    Jung Hoon Choi

  4. Department of Veterinary Internal Medicine and Geriatrics, College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea

    Jin Young Chung

  5. Department of Neurobiology, School of Medicine, Kangwon National University, Chuncheon, Korea

    Moo-Ho Won

  6. Department of Anatomy and Cell Biology, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Korea

    In Koo Hwang

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  1. Hyo Young Jung
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Jung, H.Y., Yoo, D.Y., Kim, J.W. et al. Sirtuin-2 inhibition affects hippocampal functions and sodium butyrate ameliorates the reduction in novel object memory, cell proliferation, and neuroblast differentiation. Lab Anim Res 32, 224–230 (2016). https://doi.org/10.5625/lar.2016.32.4.224

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Laboratory Animal Research

ISSN: 2233-7660