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Discovery of a periosteal stem cell mediating intramembranous bone formation

机译:发现介导膜内骨形成的骨膜干细胞

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摘要

Bone consists of separate inner endosteal and outer periosteal compartments, each with distinct contributions to bone physiology and each maintaining separate pools of cells owing to physical separation by the bone cortex. The skeletal stem cell that gives rise to endosteal osteoblasts has been extensively studied; however, the identity of periosteal stem cells remains unclear(1-5). Here we identify a periosteal stem cell (PSC) that is present in the long bones and calvarium of mice, displays clonal multipotency and self-renewal, and sits at the apex of a differentiation hierarchy. Single-cell and bulk transcriptional profiling show that PSCs display transcriptional signatures that are distinct from those of other skeletal stem cells and mature mesenchymal cells. Whereas other skeletal stem cells form bone via an initial cartilage template using the endochondral pathway(4), PSCs form bone via a direct intramembranous route, providing a cellular basis for the divergence between intramembranous versus endochondral developmental pathways. However, there is plasticity in this division, as PSCs acquire endochondral bone formation capacity in response to injury. Genetic blockade of the ability of PSCs to give rise to bone-forming osteoblasts results in selective impairments in cortical bone architecture and defects in fracture healing. A cell analogous to mouse PSCs is present in the human periosteum, raising the possibility that PSCs are attractive targets for drug and cellular therapy for skeletal disorders. The identification of PSCs provides evidence that bone contains multiple pools of stem cells, each with distinct physiologic functions.
机译:骨由单独的内骨膜内和外骨膜隔室组成,每个对骨生理都有独特的贡献,并且由于与骨皮质的物理分离,每个都保持着独立的细胞池。引起骨内膜成骨细胞的骨骼干细胞已经得到了广泛的研究。然而,骨膜干细胞的身份仍不清楚(1-5)。在这里,我们确定了长骨和小鼠颅骨中存在的骨膜干细胞(PSC),显示出克隆的多能性和自我更新能力,并且位于分化等级的最高点。单细胞和大量转录谱显示,PSC显示出与其他骨骼干细胞和成熟间充质细胞不同的转录特征。其他骨骼干细胞利用软骨内途径通过初始软骨模板形成骨骼(4),而PSC则通过直接膜内途径形成骨骼,从而为膜内和软骨内发展途径之间的差异提供了细胞基础。但是,由于PSC在响应损伤时获得了软骨内骨形成能力,因此该部门具有可塑性。 PSC产生成骨成骨细胞能力的遗传封锁导致皮质骨结构的选择性损伤和骨折愈合缺陷。人的骨膜中存在类似于小鼠PSC的细胞,从而增加了PSC是骨骼疾病的药物和细胞治疗的有吸引力的靶标的可能性。对PSC的鉴定提供了证据,表明骨骼包含多个干细胞池,每个池具有不同的生理功能。

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  • 来源
    《Nature》 |2018年第7725期|133-139|共7页
  • 作者单位

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

    Weill Cornell Med, Flow Cytometry Core Facil, New York, NY USA;

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

    Weill Cornell Med, Genom Resources Core Facil, New York, NY USA;

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

    Weill Cornell Med, Pathol & Lab Med Core Facil, New York, NY USA;

    Univ Massachusetts, Med Sch, Dept Med, North Worcester, MA USA;

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

    Univ Massachusetts, Med Sch, Dept Med, North Worcester, MA USA;

    Mem Sloan Kettering Canc Ctr, Dept Pathol, 1275 York Ave, New York, NY 10021 USA;

    Mem Sloan Kettering Canc Ctr, Dept Surg, Orthopaed Serv, 1275 York Ave, New York, NY 10021 USA;

    Hosp Special Surg, Dept Orthopaed Surg, Res Div, 535 E 70th St, New York, NY 10021 USA;

    Weill Cornell Med, Canc Genom & Evolutionary Dynam, New York, NY USA;

    Weill Cornell Med, Dept Pathol & Lab Med, New York, NY 10065 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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