Single-cell transcriptomic analysis identifies a highly replicating Cd168<sup>+</sup> skeletal stem/progenitor cell population in mouse long bones

Rui-Cong Hao; Zhi-Ling Li; Fei-Yan Wang; Jie Tang; Pei-Lin Li; Bo-Feng Yin; Xiao-Tong Li; Meng-Yue Han; Ning Mao; Bing Liu; Li Ding; Heng Zhu

doi:10.1016/j.jgg.2023.04.004

Volume 50 Issue 9

Sep. 2023

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Article Navigation > Journal of Genetics and Genomics > 2023 > 50(9): 702-712

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Single-cell transcriptomic analysis identifies a highly replicating Cd168⁺ skeletal stem/progenitor cell population in mouse long bones

doi: 10.1016/j.jgg.2023.04.004

a. Basic Medical College of Anhui Medical University, Hefei, Anhui 230032, China;
b. Beijing Institute of Radiation Medicine, Beijing 100850, China;
c. Beijing Institute of Basic Medical Sciences, Beijing 100850, China;
d. State Key Laboratory of Experimental Hematology, Department of Hematology, Fifth Medical Center of Chinese PLA General Hospital, Beijing 100071, China;
e. Air Force Medical Center, PLA, Beijing 100142, China

Funds:

This work was supported by the National Key R&D Program of China (2022YFA1104100, 2022YFA1103500), the National Natural Sciences Grants China (82172388, 82372373, 81871771), and the Beijing Natural Sciences Foundation (7222123, L212065).

Received Date: 2023-01-23
Revised Date: 2023-04-08
Accepted Date: 2023-04-09
Publish Date: 2023-04-17

Abstract

Abstract

Skeletal stem/progenitor cells (SSPCs) are tissue-specific stem/progenitor cells localized within skeletons and contribute to bone development, homeostasis, and regeneration. However, the heterogeneity of SSPC populations in mouse long bones and their respective regenerative capacity remain to be further clarified. In this study, we perform integrated analysis using single-cell RNA sequencing (scRNA-seq) datasets of mouse hindlimb buds, postnatal long bones, and fractured long bones. Our analyses reveal the heterogeneity of osteochondrogenic lineage cells and recapitulate the developmental trajectories during mouse long bone growth. In addition, we identify a novel Cd168⁺ SSPC population with highly replicating capacity and osteochondrogenic potential in embryonic and postnatal long bones. Moreover, the Cd168⁺ SSPCs can contribute to newly formed skeletal tissues during fracture healing. Furthermore, the results of multicolor immunofluorescence show that Cd168⁺ SSPCs reside in the superficial zone of articular cartilage as well as in growth plates of postnatal mouse long bones. In summary, we identify a novel Cd168⁺ SSPC population with regenerative potential in mouse long bones, which adds to the knowledge of the tissue-specific stem cells in skeletons.
- Skeletal stem cell,
- scRNA-seq,
- Bone development,
- Fracture healing,
- Bone regeneration,
- Development

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