STING誘発の調節性B細胞は,がん免疫におけるNK機能を損なう
Sirui Li1,2,3, Bhalchandra Mirlekar1,2, Brandon M Johnson1,3
1Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Nature
|October 5, 2022
まとめ
インターフェロン遺伝子刺激剤 (STING) アゴニストは,調節性B細胞を拡張し,抗腫瘍免疫を阻害する. B細胞におけるこのSTING- IL-35経路を標的にすることで,自然殺人細胞の反応を強めることで,がん治療が改善される可能性があります.
科学分野:
- 免疫学
- 腫瘍学
- 癌 生物学
背景:
- 腫瘍の微小環境は しばしば免疫反応を抑制し 癌治療の有効性を制限します
- インターフェロン遺伝子刺激剤 (STING) アゴニストは先天的な免疫を活性化しますが,がん治療では抵抗に直面します.
- 固体腫瘍におけるSTINGアゴニストに対する耐性の基礎となるメカニズムは不明である.
研究 の 目的:
- 臓がんにおける腫瘍の微小環境に対するSTINGアゴニストの影響を調査する.
- STINGアゴニストが腫瘍内の免疫細胞に影響を与えるメカニズムを解明する.
- STINGベースのがん治療に対する耐性を克服するための新しい治療戦略を特定する.
主な方法:
- 人とマウスの臓がんモデルに様々なSTINGアゴニスト (cGAMPを含む) を投与する.
- B細胞集団の分析,特にレギュレータ性B細胞を発現するインタールイキン-35 (IL-35)
- B細胞におけるSTING信号伝達経路 (IRF3,タイプIインターフェロン) の評価
- B細胞におけるSTING経路調節後の腫瘍制御の評価
- IL-35 阻害または遺伝子剥離が腫瘍の成長に及ぼす影響の調査.
- 自然キラー (NK) 細胞の増殖と抗腫瘍活動の評価
主要な成果:
- cGAMPを含むSTINGアゴニストは,臓がんにおけるIL-35+調節性B細胞の拡張を誘導する.
- cGAMPが誘発するB細胞のIL-35発現はIRF3に依存するが,タイプIインターフェロンとは独立している.
- B細胞のSTING信号の喪失は,臨床前のモデルで腫瘍のコントロールを高めます.
- B細胞のIL-35を遮断または消去すると,腫瘍の成長が低下する.
- B細胞のSTING- IL-35軸は,NK細胞の増殖と抗腫瘍反応を抑制する.
結論:
- STINGアゴニストは,逆説的に,IL-35経路経由で調節性B細胞を拡張することで,免疫抑制を促進します.
- B細胞におけるこのSTING- IL-35軸は,STINGアゴニスト単独治療に対する本質的な障壁を象徴しています.
- B細胞のSTING- IL-35経路を標的とし,潜在的にIL-35阻害と組み合わせることで,NK細胞媒介の抗腫瘍免疫を強化し,治療抵抗性を克服する戦略を提供します.
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