骨髄内皮細胞は,糖尿病における骨髄形成を調節する
Friedrich Felix Hoyer1, Xinyi Zhang2,3, Emilie Coppin2
1Center for Systems Biology and Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Simches Research Building, Boston (F.F.H., M.J.S., D.R., C.S.A., Y.I., K.N., F.K.S., M.N.).
Circulation
|April 23, 2020
まとめ
幹細胞を静止させる因子であるCxcl12を減少させることにより,糖尿病は骨髄の血液形成を妨げます. 内皮のEGFR信号は通常 幹細胞の増殖を抑制しますが 糖尿病では 傷の治癒の遅延や動脈硬化などの合併症を悪化させます
科学分野:
- 血液学
- 内分泌学
- 血管生物学
背景:
- 糖尿病は米国の人口の大部分に影響し,重度の血管合併症を引き起こします.
- 糖尿病の合併症における骨髄の血液形成の役割は完全に理解されていません.
- この研究では,骨髄内皮細胞が糖尿病における炎症性骨髄細胞生成にどのように影響するかを調査しています.
研究 の 目的:
- 糖尿病に関連する血液形成における骨髄内皮細胞の役割を明らかにする.
- 糖尿病が造血幹細胞と原始細胞 (HSPC) の生成を乱すメカニズムを特定する.
- 骨髄形成における内皮成長因子受容体 (Egfr) 信号伝達の機能を調査する.
主な方法:
- 糖尿病の3つのマウスモデル (ストレプトゾトシン,高脂肪食,db/db) で測定された白血球とHSPC.
- フローサイトメトリーと発現プロファイリングを用いて骨髄内皮細胞を分析した.
- 機能的役割を研究するために,内皮特異的なEgfr消去 (Cdh5-Egfr) を生成したマウス.
主要な成果:
- 糖尿病はHSPCの増殖と循環する骨髄細胞を増加させた.
- 糖尿病のマウスは,幹細胞保持因子である内皮Cxcl12の発現が低下した.
- 内皮のEGFRシグナル伝達が妨げられ,HSPCの増殖と骨髄細胞の生成が増加し,創傷治癒の欠陥と動脈硬化が悪化した.
結論:
- 骨髄内皮細胞は,糖尿病によって引き起こされる血液形成の調節不全において重要な役割を果たします.
- 糖尿病は内皮のCxcl12の生成を阻害し,幹細胞の増殖を促進する.
- 糖尿病におけるHSPCの増殖と骨髄細胞の生成を制御する重要な対抗レギュレーション経路として機能する.
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