オステオゲネシスとリンパポエシスのための機械感受性周辺動脈のニッチ
Bo Shen1, Alpaslan Tasdogan1, Jessalyn M Ubellacker1
1Children's Research Institute and the Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature
|February 25, 2021
まとめ
骨髄のレプチン受容体 (LEPR) + 細胞は,異なるサブタイプを持っています. オステオレクチンは,リンパ分裂をサポートし,維持のために機械的刺激を必要とする,年齢とともに減少する骨質原産体を標識します.
科学分野:
- 骨髄のストロマ細胞生物学
- 血液形成と免疫学
- 幹細胞の研究
背景:
- 骨髄のレプチン受容体 (LEPR) + ストロマ細胞は,血液形成幹細胞の維持に不可欠です.
- LEPR+細胞は多様ですが,サブセットと機能を区別するマーカーは限られています.
- LEPR+細胞の異質性を理解することは,骨髄のニッチ研究にとって極めて重要です.
研究 の 目的:
- 骨髄のニッチ内のLEPR+細胞サブセットを識別するマーカーを特定する.
- 血液形成と骨創生における異なるLEPR+細胞群の機能的役割を調査する.
- 機械的な刺激と老化による 先祖細胞の調節を研究する
主な方法:
- 周辺動脈細胞と周辺シナリオ細胞の差別化用マーカーとしてオステオレクチンを使用した.
- オステオレクチン+細胞における幹細胞因子 (SCF) の遺伝的消去が行われた.
- 細胞集団に対する機械的刺激 (自発的な走行,後肢の放荷) の影響を調査した.
- オステオレクチン+細胞における機械感受性イオンチャネルPIEZO1の役割を評価した.
主要な成果:
- オステオレクチン発現は,オステオゲン性平衡の近動脈LEPR+細胞とアディポゲン性平衡の近動脈LEPR+細胞を区別する.
- オステオレクチン+細胞からのSCFの除去はリンパ分裂と免疫応答を阻害するが,HSCの維持は阻害しない.
- 周動脈性オステオレクチン+細胞と一般的なリンパ性祖先は,機械的刺激によって維持され,年齢とともに減少する.
- オステオレクチン+ 細胞のPIEZO1 欠損は,これらの細胞とリンパ性原始細胞の枯渇につながった.
結論:
- オステオレクチンは,骨髄原産体の特定のサブセットを特定し,骨の形成とリンパの形成に関与します.
- 周辺動脈のニッチとそれに関連した祖先の集団を維持するには,機械的刺激が不可欠です.
- 年齢に伴う機械的刺激の低下は,骨髄における骨形成とリンパ形成の減少に寄与する可能性があります.
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