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LXR/ApoEの活性化は,がんにおける先天性免疫抑制を抑制する
Masoud F Tavazoie1, Ilana Pollack1, Raissa Tanqueco1
1Laboratory of Systems Cancer Biology, The Rockefeller University, New York, NY, USA.
Cell
|January 17, 2018
まとめ
肝臓X受容体 (LXR) アゴニストによる骨髄系抑制細胞 (MDSCs) を標的とした治療は,がん免疫療法を強化することができる. このアプローチは免疫抑制細胞を減少させ,前臨床モデルと第1相試験で抗腫瘍T細胞の反応を高めます.
科学分野:
- 免疫学
- 腫瘍学
- 薬理学について
背景:
- 癌の免疫療法,特にチェックポイント抑制は 治療に革命をもたらしましたが 反応率は限られています
- 免疫抑制性ミエロイド系抑制細胞 (MDSC) の高濃度を示すことが多い.
研究 の 目的:
- 癌の免疫療法の有効性を改善するために,MDSCの豊富性を調節する経路を特定し,ターゲットにする.
- 肝臓X核受容体 (LXR) アゴニズムによるMDSCの減少と抗腫瘍免疫の強化の治療の可能性を調査する.
主な方法:
- ネズミのがんモデルにおけるMDSCの調節を研究するために遺伝的および薬理学的アプローチを使用した.
- がん患者でLXRアゴニズムの第1段階の投与量エスカレーション試験を実施しました.
- 評価されたMDSCレベル,細胞毒性Tリンパ球 (CTL) 応答,およびApoEの役割.
主要な成果:
- 治療的なLXRアゴニズムにより,マウスとヒトの両方のMDSCの濃度が著しく低下しました.
- MDSCの減少は,臨床前および臨床でのCTL活性化の増加と相関しています.
- LXR標的のApoEがこれらの効果を媒介し,LXR/ApoEの活性化により抗腫瘍反応とT細胞の活性化が促進された.
結論:
- LXR/ApoE軸は,がんにおける先天性免疫抑制の重要な調節因子である.
- LXR/ApoE経路を標的にすることは,がん免疫療法の有効性を高める有望な戦略です.
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