ランプレイのチムス候補である
Baubak Bajoghli1, Peng Guo, Narges Aghaallaei
1Department of Developmental Immunology, Max Planck Institute of Immunobiology and Epigenetics, Stuebeweg 51, D-79108 Freiburg, Germany.
Nature
|February 5, 2011
まとめ
ランプレイの幼虫は,T型リンパ球の発達に不可欠な,チモイドと呼ばれるチムス状の構造を持っています. これらのチモイドは,変性リンパ球受容体 (VLR) 遺伝子アセンブリの部位であり,のある脊椎動物におけるチムスの機能に似ています.
科学分野:
- 免疫学 免疫学とは
- 進化生物学の進化生物学について
- 脊椎動物学 脊椎動物学
背景:
- のない脊椎動物 (ウミガメやウミガメ) は,を持つ脊椎動物とは異なるユニークな免疫システムを備えています.
- ランプレイは,抗原認識のために免疫グロブリンではなく,体的に多様化された変性リンパ球受容体 (VLR) を利用します.
- のない魚のリンパ球発達の主要なリンパ性臓器は,大部分が特徴化されていないままである.
研究 の 目的:
- ランプレイにおける一次リンパ性臓器の存在と機能を調査する.
- T型リンパ球発達の潜在的な部位とVLR遺伝子多様化を特定する.
主な方法:
- ランプレイの幼虫におけるリンパ上皮質構造の識別と組織学的分析.
- 特定された構造におけるFOXN1,CDA1,VLRAの遺伝子発現分析.
- 非機能的なVLRA遺伝子アセンブリの検出.
主要な成果:
- ティムス状の構造を"ティモイド (thymoids) "と称し,ランプレイの状繊維に識別された.
- ティモイドはFOXN1,CDA1,VLRAの共発現を示し,T型細胞発達の兆候を示した.
- 非機能的なVLRA遺伝子組成は,チモイドに多く存在し,VLRの多様化におけるその役割を支持した.
結論:
- Lamprey thymoidsは,のある脊椎動物における胸腺に類似した主要なリンパ性臓器として機能する.
- これらの発見は,脊椎動物の系統全体にわたる適応免疫の発達における保存された特徴を強調しています.
- この研究は,初期の脊椎動物における免疫系進化の理解を深める.
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