超抗原依存性,細胞媒介性サイト毒性は,Tリンパ球のMHCクラスI受容体によって抑制される
J H Phillips1, J E Gumperz, P Parham
1Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304, USA.
まとめ
細菌の超抗原はT細胞の活性化を誘発し,病気を引き起こす. NKB1のようなT細胞の阻害受容体は,ヒト白血球抗原 (HLA) クラスI分子を標的とし,組織損傷を潜在的に制限することによって,この活性化をブロックすることができます.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
背景:
- バクテリアのスーパーアンチゲンは,MHCクラスIIとTCRベータ鎖に結合し,T細胞を活性化します.
- このT細胞の活性化は,有毒ショック症候群と食物中毒に関連しています.
研究 の 目的:
- ヒト白血球抗原 (HLA) クラスI分子を標的とする細胞毒性Tリンパ球 (CTLs) の抑制受容体を調査する.
- これらの受容体が,スーパーアンチゲン誘発のT細胞活性化と細胞毒性をどのように影響するかを理解する.
主な方法:
- HLAクラスI分子に対する抑制受容体を発現するCTLクローンの分析.
- スタフィロコックスの腸毒素B (SEB) でコーティングされた標的細胞に対する細胞毒性を測定するためのアッセイ.
主要な成果:
- 抑制性受容体であるNKB1はCTLクローンで発見され,特定のHLA-B分子でSEBコーティングの標的の殺戮を阻害しました.
- また,標的細胞におけるHLA-A, -B, -C分子の発現は,NKB1陰性CTLクローンによって媒介される細胞分解を阻害した.
結論:
- NKB1.1を超えて,追加の抑制MHCクラスI受容体が存在する可能性が高い.
- これらのHLAクラスI特異的阻害受容体は,過剰なT細胞媒介組織破壊と自己免疫を予防する役割を果たす可能性があります.
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