| Project/Area Number |
16K09789
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Metabolomics
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| Research Institution | Jichi Medical University |
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Principal Investigator |
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| Research Collaborator |
TAKEI shoko
TAKEI akihito
NAGASHIMA shuichi
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | コレステロール / 糖尿病 / マウス / 膵β細胞 / インスリン / スタチン / HMG-CoA還元酵素 / グルカゴン / ノックアウト / コレステロール合成 / ブドウ糖 / ランゲルハンス島 / β細胞 / ノックアウトマウス / 酵素 / 脂質 / 動物 / 遺伝子 |
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| Outline of Final Research Achievements |
Inhibitors of 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR), statins, which are used to prevent to cardiovascular diseases, are associated with a modest increase in the risk of new-onset diabetes mellitus. To investigate the role of HMGCR in the development of β cells and glucose homeostasis, we deleted Hmgcr in a β cell-specific manner by using Cre-loxP technique in vivo. Mice lacking Hmgcr in β cells (β-KO) exhibited hypoinsulinemic hyperglycemia due to decreases in both β cell mass and insulin secretion. mRNA expression of Ngn3 was maintained despite the striking reduction of the expression of genes which characterize β cell identity such as insulin, Pdx1 and MafA in the islets from β-KO mice. Numbers of β cells were marketly reduced, some of which were also positive for glucagon. In conclusion, HMGCR plays critical roles not only in insulin secretion but also in the development of β cells in mice.
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| Academic Significance and Societal Importance of the Research Achievements |
膵β細胞特異的なHMGCRの欠損は、膵β細胞の減少を来たし、インスリン分泌低下及び高血糖を来たすことが明らかとなっている。マウスの遺伝子改変モデルによっても、膵β細胞の形態維持や分化・増殖能におけるHMGCRの関与が確認された。今後、このモデルを用いて、膵β細胞障害の発症機序の詳細の解明が期待出来る。そこを標的にし、スタチン投与または機能低下型HMGCR変異に起因する２型糖尿病の発症予防や治療法の開発が期待される。該当する患者数は少なくないため、世界的に増加し続ける糖尿病患者数の低減に貢献できる可能性が大きい。
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