Abstract
Background
Osteosarcoma (OS) stands out as the most common bone tumor, with approximately 20% of the patients receiving a diagnosis of metastatic OS at their initial assessment. A significant challenge lies in the frequent existence of undetected metastases during the initial diagnosis. Mesenchymal stem cells (MSCs) possess unique abilities that facilitate tumor growth, and their interaction with OS cells is crucial for metastatic spread.
Methods and results
We demonstrated that, in vitro, MSCs exhibited a heightened migration response toward the secretome of non-metastatic OS cells. When challenged to a secretome derived from lungs preloaded with OS cells, MSCs exhibited greater migration toward lungs colonized with metastatic OS cells. Moreover, in vivo, MSCs displayed preferential migratory and homing behavior toward lungs colonized by metastatic OS cells. Metastatic OS cells, in turn, demonstrated an increased migratory response to the MSCs’ secretome. This behavior was associated with heightened cathepsin D (CTSD) expression and the release of active metalloproteinase 2 (MMP2) by metastatic OS cells.
Conclusions
Our assessment focused on two complementary tumor capabilities crucial to metastatic spread, emphasizing the significance of inherent cell features. The findings underscore the pivotal role of signaling integration within the niche, with a complex interplay of migratory responses among established OS cells in the lungs, prometastatic OS cells in the primary tumor, and circulating MSCs. Pulmonary metastases continue to be a significant factor contributing to OS mortality. Understanding these mechanisms and identifying differentially expressed genes is essential for pinpointing markers and targets to manage metastatic spread and improve outcomes for patients with OS.
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Data availability
All relevant data supporting the findings of this study are available within the paper and it’s Supporting Information files.
Abbreviations
- BM:
-
Bone marrow
- CCL2:
-
C–C motif chemokine ligand 2
- CCR2:
-
C–C motif chemokine receptor 2
- CM:
-
Conditioned medium
- CTSA:
-
Cathepsin A
- CTSD:
-
Cathepsin D
- CTSs:
-
Cathepsins
- CXCR4:
-
C–X–C motif chemokine receptor 4
- CXCL12:
-
C–X–C motif chemokine ligand 12
- DAPI:
-
4′,6-Diamidino-2-phenylindole dihydrochloride
- DiR:
-
1,1′-Dioctadecyl-3,3,3′,3′-tetramethylindotricarbocyanine iodide
- DMEM:
-
Dulbecco’s modified eagle’s medium
- DMEM/F12:
-
Dulbecco’s modified eagle’s medium/nutrient mixture F12
- ECM:
-
Extracellular matrix
- FBS:
-
Fetal bovine serum
- FI:
-
Fluorescence intensity
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GEO:
-
Gene expression omnibus
- HMEC-1:
-
Human microvascular endothelial cells
- IACUC:
-
Institutional Animal Care and Use Committee
- IL-1:
-
Interleukin 1 alpha
- i.v.:
-
Intravenously
- MMPs:
-
Metalloproteinases
- MMP2:
-
Metalloproteinase 2
- MMP9:
-
Metalloproteinase 9
- MSCs:
-
Mesenchymal stem/stromal cells
- NIH:
-
National Institutes of Health
- qPCR:
-
Real time polymerase chain reaction
- PBS:
-
Phosphate buffer solution
- PECAM:
-
Platelet–endothelial cell adhesion molecule 1
- OS:
-
Osteosarcoma
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
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This work was supported in part by the Fund for Scientific and Technological Research (FONCyT) PICT No. 1974 and by Florencio Fiorini Foundation.
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MVA and LMG performed experiments, analyzed data and designed figures. MVA also contributed to the writing of the manuscript and conceived experiments. MJC, MGG, and JB performed experiments; MGG contributed with reagents and analyzed data. MB conceived research and experiments, analyzed data and wrote manuscript. Authors discussed and commented the results on the manuscript.
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Valenzuela Alvarez, M.J.P., Gutierrez, L.M., Bayo, J.M. et al. Osteosarcoma cells exhibit functional interactions with stromal cells, fostering a lung microenvironment conducive to the establishment of metastatic tumor cells. Mol Biol Rep 51, 467 (2024). https://doi.org/10.1007/s11033-024-09315-w
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DOI: https://doi.org/10.1007/s11033-024-09315-w