Ysasi Alexandra B, Engler Anna E, Bawa Pushpinder Singh, Wang Feiya, Conrad Regan D, Yeung Anthony K, Rock Jason R, Beane-Ebel Jennifer, Mazzilli Sarah A, Franklin Ruth A, Mizgerd Joseph P, Murphy George J
Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, MA 02118, USA.
Section of Hematology and Medical Oncology, Boston University Chobanian & Avedisian School of Medicine, Boston, MA 02118, USA.
iScience. 2024 Jun 4;27(7):110169. doi: 10.1016/j.isci.2024.110169. eCollection 2024 Jul 19.
Macrophages are critical for maintenance and repair of mucosal tissues. While functionally distinct subtypes of macrophage are known to have important roles in injury response and repair in the lungs, little is known about macrophages in the proximal conducting airways. Single-cell RNA sequencing and flow cytometry demonstrated murine tracheal macrophages are largely monocyte-derived and are phenotypically distinct from lung macrophages at homeostasis. Following sterile airway injury, monocyte-derived macrophages are recruited to the trachea and activate a pro-regenerative phenotype associated with wound healing. Animals lacking the chemokine receptor CCR2 have reduced numbers of circulating monocytes and tracheal macrophages, deficient pro-regenerative macrophage activation and defective epithelial repair. Together, these studies indicate that recruitment and activation of monocyte-derived tracheal macrophages is CCR2-dependent and is required for normal airway epithelial regeneration.
巨噬细胞对于黏膜组织的维持和修复至关重要。虽然已知功能不同的巨噬细胞亚型在肺部损伤反应和修复中发挥重要作用,但对于近端传导气道中的巨噬细胞却知之甚少。单细胞RNA测序和流式细胞术表明,小鼠气管巨噬细胞主要来源于单核细胞,在稳态时其表型与肺巨噬细胞不同。无菌气道损伤后,单核细胞衍生的巨噬细胞被募集到气管,并激活与伤口愈合相关的促再生表型。缺乏趋化因子受体CCR2的动物循环单核细胞和气管巨噬细胞数量减少,促再生巨噬细胞激活不足且上皮修复存在缺陷。总之,这些研究表明,单核细胞衍生的气管巨噬细胞的募集和激活依赖于CCR2,是正常气道上皮再生所必需的。
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