Abstract
Prostate cancer (PCa) bone metastasis is frequently associated with bone-forming lesions, but the source of the osteoblastic lesions remains unclear. We show that the tumor-induced bone derives partly from tumor-associated endothelial cells that have undergone endothelial-to-osteoblast (EC-to-OSB) conversion. The tumor-associated osteoblasts in PCa bone metastasis specimens and patient-derived xenografts (PDXs) were found to co-express endothelial marker Tie-2. BMP4, identified in PDX-conditioned medium, promoted EC-to-OSB conversion of 2H11 endothelial cells. BMP4 overexpression in non-osteogenic C4-2b PCa cells led to ectopic bone formation under subcutaneous implantation. Tumor-induced bone was reduced in trigenic mice (Tie2cre/Osxf/f/SCID) with endothelial-specific deletion of osteoblast cell-fate determinant OSX compared with bigenic mice (Osxf/f/SCID). Thus, tumor-induced EC-to-OSB conversion is one mechanism that leads to osteoblastic bone metastasis of PCa.
Original language | English |
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Pages (from-to) | 467-480.e3 |
Journal | Developmental Cell |
Volume | 41 |
Issue number | 5 |
DOIs | |
Publication status | Published - Jun 5 2017 |
Keywords
- bone metastasis
- endothelial-to-osteoblast conversion
- osteoblast
- paracrine factors
- prostate cancer
- proteomics
ASJC Scopus subject areas
- Developmental Biology