感染後の修復に重要なモノサイト-レプチン-血管新生経路
Rachel M Kratofil1,2, Hanjoo B Shim1,2, Raymond Shim1,2
1Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
Nature
|August 10, 2022
まとめ
傷の治癒を制御するのは 中性細胞ではなく レプチンのレベルと 感染後の血管の成長です これらの細胞はマクロファージに変容し 組織修復や傷痕形成に影響を与えます
科学分野:
- 免疫学
- 傷 の 癒し
- 細胞生物学
背景:
- 炎症性単細胞は 細菌のクリアランスにとって 伝統的に重要なものと考えられています
- 中性粒子はより強力な微生物殺菌機能を示し,感染中に単細胞よりも多くの数を集めます.
- 単細胞は,直接の感染制御を超えた多様な機能を持つマクロファージに差異化するユニークな能力を持っています.
研究 の 目的:
- Staphylococcus aureus感染とその後の傷の解消における単細胞と中性粒子の異なる役割を調査する.
- 細菌のクリアランスを超えた単細胞の機能,特に組織修復と代謝調節における役割を解明する.
- 単細胞由来マクロファージが脂肪細胞の機能,レプチンの生成,そして治癒過程における血管化の影響を理解する.
主な方法:
- Staphylococcus aureusでコーティングされた異体モデルを使って 皮膚感染症の進行と解消を研究した.
- 単細胞と中性粒子の採用パターンと局所化を観察するためにタイムラプス画像を用いた.
- マウスにおける単細胞欠乏が傷の治癒,下皮の厚み,レプチンのレベル,血管化,および傷痕形成に及ぼす影響を調査した.
- 血管の過剰成長と治癒に対するレプチンの作用を調節する単細胞由来グレリンの役割を評価した.
主要な成果:
- 単細胞と中性粒子の増殖数は,低用量感染では類似したが,高用量感染では異なっていた.
- 単細胞は感染部位の周りに局所化し,中性粒子は浸透した.単細胞は細菌のクリアランスに寄与しなかった.
- 単細胞は長生きするマクロファージに微分化し,脂肪細胞の膨張とレプチンの生成を調節した.
- 単細胞欠乏は下皮質の加厚化,レプチンの上昇,過剰な血管化,治癒の遅延,そしてより厚い傷痕をもたらしました.
- モノサイトで生成されたグレリンは レプチンの効果を相殺し,血管の過剰増殖を減らし,治癒を改善しました.
結論:
- 単細胞は,レプチンのレベルと再血管化を調節することによって,細菌のクリアランスとは異なり,傷の修復に重要な役割を果たします.
- 単細胞由来マクロファージは細胞のリオスタットとして作用し,組織修復中の代謝および血管の変化を制御する.
- レプチンやグレリン信号伝達などの単細胞主導の経路をターゲットにすることで 創傷治癒の成果を上げる可能性があります
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