メラノーマは,炎症誘発の可逆性脱差別化により,T細胞療法に抵抗する
Jennifer Landsberg1, Judith Kohlmeyer, Marcel Renn
1Laboratory of Experimental Dermatology, Department of Dermatology and Allergy, University of Bonn, D-53105 Bonn, Germany.
Nature
|October 12, 2012
まとめ
メラノーマの養子細胞移植 (ACT) 治療は,腫瘍細胞が標的抗原を失うために失敗することがあります. この研究は,炎症が逆戻り可能な抗原喪失を引き起こし,再発につながることを明らかにしています. 将来の治療法は,複数の抗原をターゲットにすべきです.
科学分野:
- 免疫学 免疫学とは
- 腫瘍学 腫瘍学
- 細胞生物学 細胞生物学
背景:
- アドプティブ・セル・トランスファー (ACT) 治療は,転移性メラノーマに対して有望だが,しばしば腫瘍の再発に直面する.
- 抗原喪失やT細胞耐性などの獲得抵抗のメカニズムは,限られた実験モデルのために完全に理解されていません.
研究 の 目的:
- 関連するメラノーマモデルにおいて,ACTに対する既得耐性のメカニズムを調査する.
- T細胞免疫療法が最初成功した後,腫瘍の再発に寄与する要因を特定する.
主な方法:
- 遺伝子組み換えマウスメラノーマモデルで有効なACTプロトコルを確立しました.
- メラノーマ細胞のフェノタイプ変化を観察するために,連続移植実験を行った.
- メラノーマ細胞の脱差と抗原発現におけるサイトカイン腫瘍死滅因子アルファ (TNF-α) の役割を調査した.
主要な成果:
- メラノーマは,炎症によって引き起こされる,メラノサイト性抗原の可逆的な喪失によって,ACTに対する耐性を獲得した.
- メラノーマ細胞は,炎症的刺激に反応して,微分化状態と無微分化状態の間で切り替え,フェノタイプの可塑性を示した.
- 腫瘍死滅因子アルファ (TNF-α) は,直接誘発された可逆性無差別化を引き起こし,メラノサイト性抗原に特異的なT細胞による認識が低下しました.
結論:
- 炎症性マイクロ環境におけるメラノーマ細胞のフェノタイプの可塑性は,ACT後の腫瘍再発を誘発する.
- 将来のACT戦略は,耐性を克服するために,メラノサイト性および非メラノサイト性抗原の両方をターゲットにする必要があります.
- ACTを,腫瘍の微小環境を調節することによってT細胞機能を維持する戦略と組み合わせることが推奨されます.
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