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A型肝炎ウイルスが,自己免疫性慢性肝炎1型を誘発する要因として,感受性の高い個体において特定された
S Vento1, T Garofano, G Di Perri
1Infectious Diseases Unit, A. Pugliese Hospital, Catanzaro, Italy.
Lancet (London, England)
|May 18, 1991
まとめ
A型肝炎ウイルス (HAV) 感染は,感受性の高い個体において,自己免疫性慢性活性肝炎 (CAH) を引き起こす可能性があります. 肝細胞表面抗原に対する免疫反応を制御するTリンパ球の欠陥が,HAV感染後のCAH発症に先行した.
科学分野:
- 免疫学 免疫学とは
- 肝臓病理学 肝臓病理学
- ウイルス学 ウイルス学 ウイルス学
背景:
- 自己免疫性慢性活性肝炎 (CAH) の病原性は,まだ完全に理解されていません.
- 自己免疫性肝疾患のトリガーを特定することは,標的治療の開発に不可欠です.
研究 の 目的:
- 自己免疫性CAHの潜在的なトリガーとして,A型肝炎ウイルス (HAV) 感染症の役割を調査する.
- 感受性の高い個体において,自己免疫CAHの発症に先立つ免疫学的要因を特定する.
主な方法:
- 自免疫性CAHの13人の患者の58人の健康な親戚を4年間フォローアップした.
- 血清学的マーカーとTリンパ球の移住抑制活動のモニタリング.
- HAV感染前と後のアシアログリコプロテイン受容体 (ASGPR) に対する免疫応答の分析.
主要な成果:
- 研究期間中に,亜臨床的急性A型肝炎の症例が3件発生しました.
- 自免疫CAHを発症した2人の被験者において,ASGPRを標的にする抑制誘発性Tリンパ球の既にある欠陥が特定されました.
- HAV感染後,これらの被験者は,持続的で増加した特定のヘルパーT細胞とASGPRに対する抗体を示し,5ヶ月以内に自己免疫CAH1型の発症を引き起こしました.
結論:
- A型肝炎ウイルス (HAV) 感染症は,遺伝的に感受性の高い個体において,自己免疫性慢性活性肝炎 (CAH) のトリガーとして作用することがあります.
- 肝細胞抗原を標的としたTリンパ球の調節における特定の欠陥は,HAV感染後の自己免疫CAHを発症させる可能性が高い.
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