期刊
CELL STEM CELL
卷 25, 期 6, 页码 797-+出版社
CELL PRESS
DOI: 10.1016/j.stem.2019.11.004
关键词
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资金
- Canadian Institutes of Health (CIHR) [PJT-149026, PJT-148816]
- Terry Fox New Frontiers Program [1021]
- National Institutes of Health [CA231652]
- CIHR [MOP 97856]
- UBC graduate scholarship
Many adult tissues contain resident stem cells, such as the Pax7(+) satellite cells within skeletal muscle, that regenerate parenchymal elements following damage. Tissue-resident mesenchymal progenitors (MPs) also participate in regeneration, although their function and fate in this process are unclear. Here, we identify Hypermethylated in cancer 1 (Hic1) as a marker of MPs in skeletal muscle and further show that Hic1 deletion leads to MP hyperplasia. Single-cell RNA-seq and ATAC-seq analysis of Hic1(+) MPs in skeletal muscle shows multiple subpopulations, which we further show have distinct functions and lineage potential. Hic1(+) MPs orchestrate multiple aspects of skeletal muscle regeneration by providing stage-specific immunomodulation and trophic and mechanical support. During muscle regeneration, Hic1(+) derivatives directly contribute to several mesenchymal compartments including Col22a1-expressing cells within the myotendinous junction. Collectively, these findings demonstrate that HIC1 regulates MP quiescence and identifies MP subpopulations with transient and enduring roles in muscle regeneration.
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