Hic1定義具有骨骼肌再生功能的間充質祖細胞亞群
作者:
小柯機器人發布時間:2019/12/9 13:50:29
加拿大英屬哥倫比亞大學T. Michael Underhill研究組發現,Hic1定義了在骨骼肌再生過程中具有不同功能和命運的靜止間質祖亞群。2019年12月5日,國際知名學術期刊《細胞—幹細胞》發表了這一成果。
研究人員發現Hic1(Hypermethylated in cancer 1)是骨骼肌間充質祖細胞(MP)的標記,並進一步表明Hic1缺失導致MP增生。骨骼肌中Hic1+MP的單細胞RNA-seq和ATAC-seq分析顯示了多個亞群,研究人員進一步發現它們具有獨特的功能和譜系潛力。Hic1+MP通過提供階段特異性的免疫調節以及營養和機械支持來協調骨骼肌再生的多個方面。在肌肉再生過程中,Hic1+衍生物直接參與多個間充質區室,包括肌腱接頭內的Col22a1表達細胞。總的來說,這些發現表明,HIC1調節MP的靜止並確立MP亞群在肌肉再生中具有短暫和持久作用。
據介紹,許多成人組織都包含常駐幹細胞,例如骨骼肌內的Pax7+衛星細胞,這些幹細胞在損傷後會再生實質成分。組織駐留MP也參與再生,儘管在此過程中它們的功能和命運尚不清楚。
附:英文原文
Title: Hic1 Defines Quiescent Mesenchymal Progenitor Subpopulations with Distinct Functions and Fates in Skeletal Muscle Regeneration
Author: R. Wilder Scott, Martin Arostegui, Ronen Schweitzer, Fabio M.V. Rossi, T. Michael Underhill
Issue&Volume: 2019/12/05
Abstract: 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.
DOI: 10.1016/j.stem.2019.11.004
Source: https://www.cell.com/cell-stem-cell/fulltext/S1934-5909(19)30459-X