Notch1を通じたDll4信号は,血管新生中に尖端細胞の形成を調節する
Mats Hellström1, Li-Kun Phng, Jennifer J Hofmann
1AngioGenetics Sweden AB, Scheeles väg 2, SE-171 77 Stockholm, Sweden. mats.hellstrom@ki.se
Nature
|January 30, 2007
まとめ
デルタ型の4 (Dll4) - Notch1シグナリングは,芽生える血管新生の間に,内皮の先端細胞の数を制御します. このメカニズムは,マウスの網膜で適切な血管形成と分岐を保証します.
科学分野:
- 発達生物学 発達生物学とは
- 細胞シグナリング
- 血管新生研究の研究
背景:
- 芽生える血管新生は,血管内皮細胞の尖端細胞が,血管内皮成長因子 (VEGF-A) による新しい血管の成長を誘導することを含む.
- 芽毎の尖端細胞の数を決定する正確なメカニズムは不明である.
研究 の 目的:
- 網膜血管新生中の尖端細胞数の調節におけるデルタ型の4 (Dll4) - Notch1信号伝達の役割を調査する.
- このシグナル伝達経路が血管の芽生えと枝分かれのパターンをどのように制御するかを理解するために.
主な方法:
- ガンマ分泌酵素阻害剤を用いたノッチ信号の抑制.
- マウスモデルにおけるDll4ハプロイン不十分性および内皮特異的なNotch1削除を含む遺伝子操作.
- Notchシグナリングを活性化するために,溶解可能な状1ペプチドを投与する.
主要な成果:
- ノッチ・シグナリングの阻害により,先端細胞の数が増加しました.
- 対照的に,Notchの活性化により,先端細胞が少なくなり,血管の分岐が減った.
- Dll4とNotchのシグナリングは,芽生えた網膜の血管にモザイク分布を示し,Notch1が削除された細胞は先端細胞の運命を好む.
結論:
- Dll4-Notch1のシグナル伝達は,VEGFに対する反応として尖端細胞の形成を制限する重要な調節剤として作用します.
- この経路は,効果的な血管新生のために,先端と茎細胞の間の正しいバランスを確立します.
- Dll4またはNotchシグナリングの調節剤は,血管新生を制御する潜在的な治療薬である可能性があります.
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