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FOXK1とFOXK2はエアロビック糖分解を調節する

Valentina Sukonina¹, Haixia Ma¹, Wei Zhang¹

¹Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden.

|February 1, 2019

まとめ

フォークヘッドの転写因子FOXK1とFOXK2は,鍵となる酵素を上昇調節し,ミトコンドリアのピルバート酸化を抑制することによって,有酸素糖分解を活性化します. この代謝再プログラムが細胞の適応とエネルギー抽出に不可欠です

科学分野:

細胞の代謝
分子生物学
生物化学

背景:

細胞の環境変化への適応とエネルギー抽出は生存に不可欠です
一般的な代謝経路は理解されているが,栄養利用適応の正確なメカニズムは不明である.
フォークヘッド転写因子 (FOXK1とFOXK2) は,断食と飢餓に対する細胞反応に関与する.

研究の目的:

細胞代謝の調節におけるFOXK1とFOXK2のメカニズム的役割を明らかにする.
これらの転写因子が糖分解とミトコンドリアの酸化のバランスにどのように影響するか調べる.
FOXK1とFOXK2が有酸素糖分解に与える影響を理解する.

主な方法:

細胞培養を用いた in vitro 研究
動物モデルでの体内実験
人間の細胞を分析する
酵素活性と,糖分解とミトコンドリアの代謝に関連する遺伝子発現を測定するアッセイ.

主要な成果:

FOXK1とFOXK2は,ヘキソキナーゼ-2,フォスフォフルトキナーゼ,ピルバートキナーゼ,およびラクト酸脱水素酶などの酵素を上調することによって,有酸素糖分解を誘導することが示された.
これらの要因は,ピルバ酸脱水素酵素キナーゼ (PDK1,PDK4) を増加させ,ピルバ酸脱水素酵素ファスファターゼ1 (PDP1) を減少させ,ミトコンドリアのピルバ酸酸化を抑制する.
これは,ミトコンドリア呼吸よりも乳酸生成を促進する,ピルバート脱水素酶複合体のリン酸化と抑制の増加につながります.

結論:

FOXK1とFOXK2は,細胞代謝をエアロビック・グリコロシスへと再プログラムする重要な調節体として作用する.
FOXK1とFOXK2を抑制すると,この代謝表型が逆転する.
これらの発見は,代謝適応におけるFOXK1/FOXK2の重要な役割を強調し,有酸素糖解のメカニズムの洞察を提供します.

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