生体力学的な力は,胚の血液形成を促進する
Luigi Adamo1, Olaia Naveiras, Pamela L Wenzel
1Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|May 15, 2009
まとめ
流体切断ストレスなどの生体力学的な力は,血液細胞の発達に不可欠です. この研究では,シアストレスは,Runx1の発現を増加させることで,原始細胞の血液生成能力を高めることが示されています.
科学分野:
- 発達生物学 発達生物学について
- 心血管生物学 心血管生物学
- ヘマトポエーシス (血液形成) とは
背景:
- バイオメカニカル力は,胚の発達,特に心血管系の重要な調節因子としてますます認識されています.
- 転写因子Runx1は,血液形成の主調節体であり,心臓の鼓動開始後に特定の血管細胞で発現します.
- 発達中のこれらの細胞の血液形成の可能性に対する生体力学的力の影響は十分に理解されていません.
研究 の 目的:
- 生体力学的な力,特に流体切断ストレスが,胚形成過程で血液形成の可能性を調節するかどうかを調査する.
- Runx1発現の役割が,血造原始細胞にシアストレスの影響を媒介する役割を決定する.
- 発育中のマウスの胚の血液形成発達に対する切断ストレスのインビボおよびインビトロの影響を調査する.
主な方法:
- マウスの胚性幹細胞をインビトロで微分化して,早期の血液形成の発達をモデル化するために利用した.
- 血芽細胞の原始細胞に制御された液体切断ストレスを施し,Runx1の発現とコロニー形成の可能性を分析した.
- ネズミの胚から採取したパラアオルティック・スプランクノプレュラ/アオルタ・ゴナド・メソネフロスの組織における血液形成マーカーと潜在能力を,スイア・ストレスの条件下で調べた.
- 酸化窒素の信号伝達の役割を,その経路を廃止し,血液形成の可能性への影響を評価することによって調査した.
主要な成果:
- 流体切断ストレスは,CD41 (((+)) c-Kit (((+)) 造血原始細胞におけるRunx1発現を著しく増加させた.
- Runx1発現の増加は,血液生成体コロニー形成の可能性の増大と関連していた.
- シーアストレスは,胚性パラアオルティック組織における血球形成のコロニー形成の可能性とマーカー発現を高めました.
- 酸化窒素のシグナリングの廃止は,インビトロとインビボの両方で,血液形成の可能性を損なう.
結論:
- 生物力学的な力,特に流体切断ストレスが,血液形成の発達を調節する上で重要な役割を果たします.
- シーアストレスは,原始細胞のRunx1発現を上調することで,血液形成の可能性を高めます.
- 酸化窒素は,血質形成に不可欠な剪定ストレス誘発信号伝達経路の媒介者として作用する.
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