Abstract:
:Osteosarcomas are bone tumors that frequently metastasize to the lung. Aberrant expression of the transcription factor, runt-related transcription factor 2 (RUNX2), is a key pathological feature in osteosarcoma and associated with loss of p53 and miR-34 expression. Elevated RUNX2 may transcriptionally activate genes mediating tumor progression and metastasis, including the RUNX2 target gene osteopontin (OPN/SPP1). This gene encodes a secreted matricellular protein produced by osteoblasts to regulate bone matrix remodeling and tissue calcification. Here we investigated whether and how the RUNX2/OPN axis regulates lung metastasis of osteosarcoma. Importantly, RUNX2 depletion attenuates lung metastasis of osteosarcoma cells in vivo. Using next-generation RNA-sequencing, protein-based assays, as well as the loss- and gain-of-function approaches in selected osteosarcoma cell lines, we show that osteopontin messenger RNA levels closely correlate with RUNX2 expression and that RUNX2 controls the levels of secreted osteopontin. Elevated osteopontin levels promote heterotypic cell-cell adhesion of osteosarcoma cells to human pulmonary microvascular endothelial cells, but not in the presence of neutralizing antibodies. Collectively, these findings indicate that the RUNX2/OPN axis regulates the ability of osteosarcoma cells to attach to pulmonary endothelial cells as a key step in metastasis of osteosarcoma cells to the lung.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Villanueva F,Araya H,Briceño P,Varela N,Stevenson A,Jerez S,Tempio F,Chnaiderman J,Perez C,Villarroel M,Concha E,Khani F,Thaler R,Salazar-Onfray F,Stein GS,van Wijnen AJ,Galindo Mdoi
10.1002/jcp.28046subject
Has Abstractpub_date
2019-08-01 00:00:00pages
13659-13679issue
8eissn
0021-9541issn
1097-4652journal_volume
234pub_type
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