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Functional analysis of Smek2 which regulates metabolisms of three major nutrients

Research Project

Project/Area Number 21K14806
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 38050:Food sciences-related
Research InstitutionKyushu University

Principal Investigator

Yasutake Tanaka  九州大学, 農学研究院, 助教 (90809435)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
KeywordsSmek2 / アミロイドβ / アルツハイマー型認知症 / 代謝異常 / ゲノム編集 / 実験動物 / 高コレステロール血症 / 三大栄養素代謝 / 糖代謝 / ホモシステイン
Outline of Research at the Start

本研究は代表者らが食事誘導性高コレステロール血症の原因遺伝子として同定した、遺伝子Smek2の機能性の解明に取り組むものである。Smek2の機能をより厳密に解析するため、ゲノム編集技術を利用してSmek2ノックアウトラットを確立する。また、Smek2の機能異常によって食事誘導性高コレステロール血症以外の病態の発生が予測されるため、その側面を評価し、新規モデル動物としての可能性も探索する。

Outline of Final Research Achievements

The aim of this study is to analyze the function of the Smek2 gene, which was identified as one of the causative genes for diet-induced hypercholestereoemia in exogenous hypercholesterolemic (ExHC) rat. To achieve this aim, we tried to creat Smek2 knockout rats using the CRISPER/Cas9 system and to establish an in vitro Smek2 overexpression system. While we did not achieve to create Smek2 knockout rats due to technical problems, we succeeded in constructing a vector for an overexpression system to conduct an overexpression experiment with human neuroblast cells. As a result, overexpression of Smek2 decreased the amount of amyloid β contained in the cell culture supernatant. This suggested that Smek2 may control suppressively amyloid-β production in the brain. This result may bring new developments to Alzheimer's disease research.

Academic Significance and Societal Importance of the Research Achievements

Smek2に欠損変異のあるExHCラットの脳ではアミロイドβの蓄積が見られたことから、Smek2はアルツハイマー型認知症の発症・進展においても重要な意味を持つ遺伝子であると考えてきた。今回、ヒト神経芽細胞腫 SH-SY5Y 細胞における過発現実験において、Smek2過発現によってアミロイドβ量が減少したことから、そのことが裏付けられる形となった。これまでアルツハイマー型認知症研究の対象となる遺伝子はアミロイドβそのものあるいはその切断酵素(βセクレターゼ)であったため、本成果はアルツハイマー型認知症研究に新たな展開をもたらす可能性がある。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2023 2022

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Mutation in Smek2 regulating hepatic glucose metabolism causes hypersarcosinemia and hyperhomocysteinemia in rats2023

    • Author(s)
      Tanaka Yasutake、Kawano Michio、Nakashima Sawako、Yamaguchi Chisato、Asahina Makoto、Sakamoto Mai、Shirouchi Bungo、Tashiro Kousuke、Imaizumi Katsumi、Sato Masao
    • Journal Title

      Scientific Reports

      Volume: 13 Issue: 1 Pages: 3053-3053

    • DOI

      10.1038/s41598-022-26115-z

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Smek2 is a multi-function regulator of three major nutritions2022

    • Author(s)
      Yasutake Tanaka, Michio Kawano, Makoto Asahina, Katsumi Imaizumi, Masao Sato
    • Organizer
      22nd IUNS-ICN INTERNATIONAL CONGRESS OF NUTRITION
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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