防御性耐性は,浸透した病原性B細胞の再プログラムと機能障害を誘導し,耐性の維持を保証する
Koki Hayashi1,2,3, Takahiro Yokose1,2,3, Jenna Lancey1,2,3
1Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital and Harvard Medical School; Boston, MA, USA.
Research square
|September 2, 2025
まとめ
調節性B細胞 (Bregs) は移植耐性を引き起こさない. 代わりに,B細胞のFcγRIIBとSiglec-Gは移植受容と腫瘍免疫回避の鍵となる.
科学分野:
- 免疫学
- 移植免疫学
- がん免疫学
背景:
- 受け入れられた腎臓アロインプラントに浸透した免疫細胞は",防御性耐性"によって制御性/枯渇性細胞に再プログラムされる.
- B細胞のレギュレーションシグネチャー (Breg) は以前,受け入れられた腎臓アロ移植で観察された.
研究 の 目的:
- 腎臓アロインプラントの受容におけるB細胞とその調節機能を調査する.
- 移植耐性におけるB細胞抑制受容体Siglec- GとFcγRIIBの役割を調査する.
- 同様のB細胞メカニズムが腫瘍の免疫回避に寄与するかどうかを判断する.
主な方法:
- B細胞の枯渇と,アロ移植の拒絶を評価するためにμMT受容体 (B細胞が欠けている) の使用.
- 受け入れられた腎臓および肺アロ移植におけるSiglec-GおよびFcγRIIB発現の分析
- B6.Fcgr2b ノックアウト (KO) 受信者への腎臓アロ移植
- ヒトのメラノーマにおけるSIGLEC10発現の分析と,抗PD1治療への反応との関連
主要な成果:
- B細胞の枯渇も,μMT受容者も,Breg現象型にもかかわらず,腎臓アロ移植の拒絶を示さなかった.
- 受け入れられた腎臓と肺のアロ移植では,Siglec- GとFcγRIIBの発現の増加が観察されました.
- B6. Fcgr2b KO受容者の腎臓アロインプラントは,抗体媒介による拒絶を経験した.
- ヒトのメラノーマにおけるSIGLEC10発現は,抗PD1治療に対する耐性と相関している.
結論:
- FcγRIIBとSiglec- GのB細胞発現は,移植耐性の維持に不可欠である.
- これらのB細胞抑制受容体は,抗腫瘍免疫の腫瘍逃避に役割を果たします.
- FcγRIIBとSiglec- Gは,抗腫瘍免疫を強化し,移植結果を改善するための潜在的な治療目標です.
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