American Association for Cancer Research
cd-22-0220_supplementary_video_1_suppsv1.mp4 (44.67 MB)

Supplementary Video 1 from Bone Metastasis Initiation Is Coupled with Bone Remodeling through Osteogenic Differentiation of NG2+ Cells

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posted on 2023-04-04, 00:21 authored by Weijie Zhang, Zhan Xu, Xiaoxin Hao, Tiancheng He, Jiasong Li, Yichao Shen, Kai Liu, Yang Gao, Jun Liu, David G. Edwards, Aaron M. Muscarella, Ling Wu, Liqun Yu, Longyong Xu, Xi Chen, Yi-Hsuan Wu, Igor L. Bado, Yunfeng Ding, Sergio Aguirre, Hai Wang, Zbigniew Gugala, Robert L. Satcher, Stephen T.C. Wong, Xiang H.-F. Zhang

Supplemantary Video 1, LLC1 cells cocultured with NG2+ BMSCs


National Cancer Institute (NCI)

United States Department of Health and Human Services

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U.S. Department of Defense (DOD)

Breast Cancer Research Foundation (BCRF)

Robert and Janice McNair Foundation (McNair Foundation)

John S. Dunn Foundation (Dunn Foundation)



The bone microenvironment is dynamic and undergoes remodeling in normal and pathologic conditions. Whether such remodeling affects disseminated tumor cells (DTC) and bone metastasis remains poorly understood. Here, we demonstrated that pathologic fractures increase metastatic colonization around the injury. NG2+ cells are a common participant in bone metastasis initiation and bone remodeling in both homeostatic and fractured conditions. NG2+ bone mesenchymal stem/stromal cells (BMSC) often colocalize with DTCs in the perivascular niche. Both DTCs and NG2+ BMSCs are recruited to remodeling sites. Ablation of NG2+ lineage impaired bone remodeling and concurrently diminished metastatic colonization. In cocultures, NG2+ BMSCs, especially when undergoing osteodifferentiation, enhanced cancer cell proliferation and migration. Knockout of N-cadherin in NG2+ cells abolished these effects in vitro and phenocopied NG2+ lineage depletion in vivo. These findings uncover dual roles of NG2+ cells in metastasis and remodeling and indicate that osteodifferentiation of BMSCs promotes metastasis initiation via N-cadherin–mediated cell–cell interaction. The bone colonization of cancer cells occurs in an environment that undergoes constant remodeling. Our study provides mechanistic insights into how bone homeostasis and pathologic repair lead to the outgrowth of disseminated cancer cells, thereby opening new directions for further etiologic and epidemiologic studies of tumor recurrences.This article is highlighted in the In This Issue feature, p. 247

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