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Updated: Jun 2, 2025

Real-Time Imaging of CCL5-Induced Migration of Periosteal Skeletal Stem Cells in Mice
Published on: September 16, 2020
No bones about it: regulatory T cells promote fracture healing
Jason W Griffith1,2, Andrew D Luster1,3
1Center for Immunology and Inflammatory Diseases.
Abstract:
Regulatory T cells (Tregs) are increasingly being recognized for their role in promoting tissue repair. In this issue of the JCI, Chen et al. found that Tregs at the site of bone injury contribute to bone repair. The CCL1/CCR8 chemokine system promoted the accumulation of Tregs at the site of bone injury, where Tregs supported skeletal stem cell (SSC) accumulation and osteogenic differentiation. CCL1 increased the transcription factor basic leucine zipper ATF-like transcription factor (BATF) in CCR8+ Tregs, which induced the secretion of progranulin that promoted SSC osteogenic function and new bone formation. This study highlights the ever-expanding role of Tregs in tissue repair by demonstrating their ability to expand stem cells at a site of injury.
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