年老いた骨格幹細胞は炎症性退化ニッチを生成する
Thomas H Ambrosi1,2, Owen Marecic1,2, Adrian McArdle1,2
1Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|August 12, 2021
まとめ
老化した骨髄幹細胞は,骨髄のニッチを変化させ,骨の再生を阻害する. BMP2とCSF1アンタゴニストの併用療法により,老いたマウスの骨の再生が成功しました.
科学分野:
- 骨格生物学
- 幹細胞生物学
- ゲロントロジー
背景:
- 骨格の整合性は,バランスのとれた骨格細胞と骨格細胞の活動に依存しています.
- 老化と病気は このバランスを崩し 骨の衰えにつながります
- 骨幹細胞の内在的な老化は,骨の健康に悪影響を及ぼします.
研究 の 目的:
- SSCの固有の老化は骨髄のニッチと骨格再生にどのように影響するか調査する.
- 年齢に伴う骨の脆さや 治癒不良の原因を特定する
- 老化した骨格の再生のための治療戦略を探求する.
主な方法:
- 年老いたマウスと若いマウスのSSCの単細胞RNAシーケンシング
- ヘテロクロニック・パラバイオシスと 造血幹細胞移植実験
- 骨折モデルにおけるBMP2とCSF1アンタゴニストの局所結合治療
主要な成果:
- 年老いたSSCは骨/軟骨の形成が低下し,炎症誘発性サイトカインの産生が増加している.
- 年老いたSSCのトランスクリプトミックの多様性が低下すると,骨髄のニッチが変化し,骨髄系統の歪みが促進される.
- 若年期の循環や幹細胞は,高齢のSSC機能障害を逆転させなかった.
- 結合療法により,老いたSSCが再活性化され,骨の再生が若々しい状態に戻った.
結論:
- SSCの内在的老化は,骨格の老化と血液形成の老化の主要な要因です.
- 骨髄のニッチ変容は骨の脆弱性を悪化させ,治癒を阻害する.
- ターゲットを絞った組み合わせ療法は 老化した骨格を若返らせる 有望なアプローチです
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