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2015 ; 34
(37
): 4821-33
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Osteopontin mediates an MZF1-TGF-?1-dependent transformation of mesenchymal stem
cells into cancer-associated fibroblasts in breast cancer
#MMPMID25531323
Weber CE
; Kothari AN
; Wai PY
; Li NY
; Driver J
; Zapf MA
; Franzen CA
; Gupta GN
; Osipo C
; Zlobin A
; Syn WK
; Zhang J
; Kuo PC
; Mi Z
Oncogene
2015[Sep]; 34
(37
): 4821-33
PMID25531323
show ga
Interactions between tumor cells and cancer-associated fibroblasts (CAFs) in the
tumor microenvironment significantly influence cancer growth and metastasis.
Transforming growth factor-? (TGF-?) is known to be a critical mediator of the
CAF phenotype, and osteopontin (OPN) expression in tumors is associated with more
aggressive phenotypes and poor patient outcomes. The potential link between these
two pathways has not been previously addressed. Utilizing in vitro studies using
human mesenchymal stem cells (MSCs) and MDA-MB231 (OPN+) and MCF7 (OPN-) human
breast cancer cell lines, we demonstrate that OPN induces integrin-dependent MSC
expression of TGF-?1 to mediate adoption of the CAF phenotype. This OPN-TGF-?1
pathway requires the transcription factor, myeloid zinc finger 1 (MZF1). In vivo
studies with xenotransplant models in NOD-scid mice showed that OPN expression
increases cancer growth and metastasis by mediating MSC-to-CAF transformation in
a process that is MZF1 and TGF-?1 dependent. We conclude that tumor-derived OPN
engenders MSC-to-CAF transformation in the microenvironment to promote tumor
growth and metastasis via the OPN-MZF1-TGF-?1 pathway.