協力性エピテリアファゴシトーシスは,初期胚の誤差修正を可能にします

Esteban Hoijman¹, Hanna-Maria Häkkinen², Queralt Tolosa-Ramon²

¹Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain. hoijman@gmail.com.

Nature

|February 11, 2021

まとめ

初期の胚の組織は斑馬魚やマウスの表皮のように集合的メカニズムを使って死んだ細胞を浄化しますこれはアポプトティック細胞を包み込み分散させる特殊な突起を伴うもので発達の強さを保証します

科学分野:

発達生物学
細胞生物学
免疫学

背景:

アポプトシス細胞のクリアランスは,発達と組織ホメオスタシスにとって極めて重要です.
免疫細胞によるファゴサイトーシスは分化組織で知られているが,初期の胚におけるその役割は不明である.
早期の胚形成には細胞死があり効率的なクリアランスメカニズムが必要です

研究の目的:

胚芽細胞のアポプトシス細胞の除去方法を研究する.
初期の胚組織におけるアポプトシス細胞クリアランスの細胞メカニズムを特定する.
胚の誤差修正における上皮細胞の役割を理解する.

主な方法:

ゼブラフィッシュとマウスの胚の定量的な4次元のインビボ画像
Rac1に依存する基礎上皮質突起 (ファゴシトカップと上皮質腕) の分析.
フォスファディチルセリン媒介の標的認識とArp2/3依存の機械的プッシングの調査.

主要な成果:

胚性上皮は,アポプトティック細胞の効率的なファゴサイトクリアランスを実行します.
2種類の上皮突起 (ファゴサイトカップと上皮腕) を含む集団的メカニズムが特定されました.
エピテリアアームは,機械的な押し付けにより,アポプトティック標的の急速な分散を促進し,長距離の協力を可能にします.

結論:

胚の上皮は,アポプトシス細胞をクリアするための生まれつきの免疫機能を持っています.
コレクティブ上皮のクリアランスは,エラーを修正することによって,発達の強度と胚の生存を最適化します.
このメカニズムは,機械的な負荷分担により,非運動性表皮細胞のクリアランス能力を拡張します.

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