Single-cell transcriptomic analysis identifies a highly replicating Cd168⁺ skeletal stem/progenitor cell population...

Area of Science:

• Skeletal biology
• Stem cell research
• Developmental biology

Background:

• Skeletal stem/progenitor cells (SSPCs) are crucial for bone development, homeostasis, and regeneration.
• Understanding the heterogeneity and regenerative capacity of SSPCs in mouse long bones is limited.

Purpose of the Study:

• To investigate the heterogeneity of SSPC populations in mouse long bones.
• To identify novel SSPC subsets and characterize their regenerative potential.

Main Methods:

• Integrated analysis of single-cell RNA sequencing (scRNA-seq) datasets from embryonic, postnatal, and fractured mouse long bones.
• Multicolor immunofluorescence to localize identified SSPC populations.

Main Results:

• Revealed heterogeneity within osteochondrogenic lineage cells and recapitulated developmental trajectories.
• Identified a novel Cd168+ SSPC population with high proliferative capacity and osteochondrogenic potential.
• Demonstrated that Cd168+ SSPCs contribute to skeletal tissue regeneration during fracture healing.
• Localized Cd168+ SSPCs to the superficial zone of articular cartilage and growth plates.

Conclusions:

• A novel Cd168+ SSPC population with significant regenerative potential in mouse long bones has been identified.
• This discovery enhances the understanding of tissue-specific stem cells within the skeletal system.
• Cd168+ SSPCs represent a promising target for future skeletal regenerative medicine strategies.