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GAPDHは,細胞のエネルギーホメオスタシスの飢餓中の細胞内経路を阻害する

Jia-Shu Yang¹, Jia-Wei Hsu¹, Seung-Yeol Park¹

¹Division of Rheumatology, Immunology and Allergy, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.

|September 14, 2018

まとめ

飢餓時,グリセラルデヒド3リン酸脱水素酶 (GAPDH) は細胞内輸送を停止してエネルギーを節約します. このメカニズムは,コートタンパク質I (COPI) の膀分裂を阻害し,細胞エネルギーホメオスタシスの新しい側面を明らかにします.

科学分野:

細胞生物学
分子生物学
生物化学

背景:

飢餓は細胞の生存に重大な課題をもたらします
飢餓中のエネルギー恒常性におけるオートファギーの役割はよく知られていますが,他のメカニズムは不明です.

研究の目的:

飢餓中の細胞エネルギーホメオスタシスの新しいメカニズムを調査する.
細胞内輸送の調節におけるグリセルアルデヒド3リン酸脱水酵素 (GAPDH) の役割を明らかにする.

主な方法:

GAPDHと細胞内輸送機構の構成要素の相互作用を調査した.
膀の輸送と分裂に対するGAPDHの影響を評価するために生化学的測定を用いた.
飢餓状況下でのGAPDHによるARFGAPの規制を調査した.

主要な成果:

GAPDHは,ARF GAPを標的とし,特にCOPIの膀分裂を抑制することで,コートタンパク質I (COPI) の膀輸送を阻害することが判明しました.
このGAPDHの抑制作用は,他の複数の細胞内輸送経路にも及ぶ.
GAPDHによる輸送の広範な阻害は,エネルギー消費を減らすために飢餓中に細胞によって活性化されます.

結論:

GAPDHは,飢餓中の細胞内輸送を調節する上で重要な役割を果たします.
この調節は細胞のエネルギーホメオスタシスの重要な構成要素であり複数の輸送経路で調整されます
細胞がストレス下でのエネルギー資源を管理する新しいメカニズムが明らかになりました

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