初期微生物群は,転移性メラノーマ患者における抗PD-1有効性に関連している
Vyara Matson1, Jessica Fessler1, Riyue Bao2,3
1Department of Pathology, University of Chicago, Chicago, IL 60637, USA.
まとめ
腸内微生物群は 癌の免疫療法に影響します Bifidobacterium longumのような特定のバクテリアは,応答者において豊富に存在し,メラノーマ患者の抗PD-1治療の有効性を高める可能性があります.
科学分野:
- 腫瘍学
- 免疫学
- 微生物群の研究
背景:
- 抗プログラム細胞死タンパク質1 (抗PD-1) 免疫療法は重要ながん治療法ですが,患者の反応率は著しく異なります.
- 免疫療法における患者間異質性は,腸内微生物の組成の違いと関連している可能性があります.
- 臨床前モデルでは,抗腫瘍免疫と治療の有効性を調節する微生物の役割を示しています.
研究 の 目的:
- 転移性メラノーマ患者の抗PD-1 免疫療法に対する臨床反応との関連を調査する.
- 免疫療法に対する好ましい反応と相関する特定の細菌種を特定する.
主な方法:
- 16S rRNA遺伝子配列とメタゲノムショットガン配列を用いて,転移性メラノーマ患者の基礎的な便サンプルを分析した.
- 定量ポリメラーゼ連鎖反応 (qPCR) が標的細菌の定量化に使用された.
- 機能的影響を評価するために,細菌のないマウスに糞便の微生物群を移植した.
主要な成果:
- 抗PD-1 治療に対する臨床的反応との間に有意な相関が認められた.
- Bifidobacterium longum,Collinsella aerofaciens,Enterococcus faeciumなどの細菌種は,治療に反応した患者でより多く見られた.
- 反応したマウスから細菌のないマウスの糞便を移植することで,腫瘍の制御,T細胞の反応,および抗PD- L1治療の有効性が向上しました.
結論:
- 腸内微生物群は,ヒトがんにおける抗腫瘍免疫と抗PD-1免疫療法の有効性に影響を与えるメカニズム的な役割を果たします.
- 特定の共生細菌は,免疫療法の結果を改善するための予測バイオマーカーまたは治療標的として機能する.
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