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セルトラリン・クロロキン併用療法、低酸素および免疫抑制性セリン/グリシン合成依存型神経膠腫を標的に

iLIFE by iLIFE
2024年11月13日
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以下の内容を日本語のニュース記事として翻訳しました。

—

**要約**
セリン/グリシン(ser/gly)合成経路は解糖系から分岐し、約30%の癌で過剰活性化しています。約13%の神経膠腫(グリオブラストーマ)症例において、セリン合成の最終ステップを触媒する酵素PSPHをコードする遺伝子において、頻繁な増幅と稀な変異が観察されました。これにより、PSPHの遺伝的変化とその後のser/gly代謝の異常が神経膠腫の病因においてどのように関連しているかを明らかにする必要があると考えました。PSPHおよびPSPHV116Iを過剰発現させた一次神経膠腫細胞は、クローン形成能力、細胞増殖、移動が増加し、ヌクレオチド合成の増加と還元型NAD(P)の利用によって支持されました。私たちは以前、セリン/グリシン合成の阻害剤としてセルトラリンを特定し、臨床的に前テストされたクロロキンと組み合わせて、ser/gly高発現の神経膠腫モデルに対する効果を最適でない用量で探求しました。興味深いことに、PSPH増幅およびPSPHV116Iを含むser/gly高発現の神経膠腫は、併用療法に応じて選択的な相乗的増殖抑制を示しました。PSPHのノックダウンは、ser/gly高発現の神経膠腫のクローン形成能力と増殖に深刻な影響を与え、同時にクロロキン治療に対する感受性を高めました。代謝物のランドスケープ解析により、セルトラリン/クロロキンの併用治療がNADHおよびATPの生成を阻害し、ヌクレオチド合成を制限することで神経膠腫の増殖を抑制することが明らかになりました。私たちの以前の研究は、ser/gly高発現の癌細胞が免疫抑制のレベルでその微小環境を調節することを強調しています。この観点から、高いPSPH発現は神経膠腫患者における免疫チェックポイント療法の反応が悪いことを予測します。興味深いことに、神経膠腫におけるPSPHの増幅は、セルトラリン治療によって抑制可能な免疫抑制因子ガレクチン-1の発現を促進します。総じて、私たちはser/gly高発現の神経膠腫が、増殖能力、移動性、免疫系の抑制が強化されていることを明らかにし、セルトラリン/クロロキンの併用治療を用いることで、このGBM患者群に対する新たな治療機会を示しました。

—

この翻訳は、元の内容を日本語で正確に伝えることを目的としています。

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