| First Author | Wei Y | Year | 2021 |
| Journal | Elife | Volume | 10 |
| PubMed ID | 34085927 | Mgi Jnum | J:312424 |
| Mgi Id | MGI:6715030 | Doi | 10.7554/eLife.62917 |
| Citation | Wei Y, et al. (2021) The critical role of Hedgehog-responsive mesenchymal progenitors in meniscus development and injury repair. Elife 10:e62917 |
| abstractText | Meniscal tears are associated with a high risk of osteoarthritis but currently have no disease-modifying therapies. Using a Gli1 reporter line, we found that Gli1(+) cells contribute to the development of meniscus horns from 2 weeks of age. In adult mice, Gli1(+) cells resided at the superficial layer of meniscus and expressed known mesenchymal progenitor markers. In culture, meniscal Gli1(+) cells possessed high progenitor activities under the control of Hh signal. Meniscus injury at the anterior horn induced a quick expansion of Gli1-lineage cells. Normally, meniscal tissue healed slowly, leading to cartilage degeneration. Ablation of Gli1(+) cells further hindered this repair process. Strikingly, intra-articular injection of Gli1(+) meniscal cells or an Hh agonist right after injury accelerated the bridging of the interrupted ends and attenuated signs of osteoarthritis. Taken together, our work identified a novel progenitor population in meniscus and proposes a new treatment for repairing injured meniscus and preventing osteoarthritis. |
