Abstract
Patient data suggest that colony-stimulating factor-1 (CSF1) and its receptor (CSF1R) have critical roles during breast cancer progression. We have previously shown that in human breast tumors expressing both CSF1 and CSF1R, invasion in vivo is dependent both on a paracrine interaction with tumor-associated macrophages and an autocrine regulation of CSF1R in the tumor cells themselves. Although the role of the paracrine interaction between tumor cells and macrophages has been extensively studied, very little is known about the mechanism by which the autocrine CSF1R signaling contributes to tumor progression. We show here that breast cancer patients of the claudin-low subtype have significantly increased expression of CSF1R. Using a panel of breast cancer cell lines, we confirm that CSF1R expression is elevated and regulated by TGFβ specifically in claudin-low cell lines. Abrogation of autocrine CSF1R signaling in MDA-MB-231 xenografts (a claudin-low cell line) leads to increased tumor size by enhanced proliferation, but significantly reduced invasion, dissemination and metastasis. Indeed, we show that proliferation and invasion are oppositely regulated by CSF1R downstream of TGFβ only in claudin-low cell lines. Intravital multiphoton imaging revealed that inhibition of CSF1R in the tumor cells leads to decreased in vivo motility and a more cohesive morphology. We show that, both in vitro and in vivo, CSF1R inhibition results in a reversal of claudin-low marker expression by significant upregulation of luminal keratins and tight-junction proteins such as claudins. Finally, we show that artificial overexpression of claudins in MDA-MB-231 cells is sufficient to tip the cells from an invasive state to a proliferative state. Our results suggest that autocrine CSF1R signaling is essential in maintaining low claudin expression and that it mediates a switch between the proliferative and the invasive state in claudin-low tumor cells downstream of TGFβ.
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Acknowledgements
We thank Drs Paraic Kenny, Richard Stanley, Jeffrey Segall and members of the Condeelis lab for helpful discussions. The AFS98, total and phospho-Y559 CSF1R antibodies were a generous gift from Dr Richard Stanley. For technical help at Albert Einstein College of Medicine, we thank the Histotechnology and Comparative Pathology Facility, the shRNA Core Facility, the FACS Facility (supported by NCI P30 CA 013330) and the Genomics Facility. This work was supported by NCI grants 5RO1CA164468 (AP, YW, XC, DE and JSC) and RO1CA170507 (JP, MO and JSC).
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JSC holds equity and is a consultant for MetaStat and for Deciphera Pharmaceuticals. DE is a consultant for MetaStat. The remaining authors declare no conflict of interest.
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Patsialou, A., Wang, Y., Pignatelli, J. et al. Autocrine CSF1R signaling mediates switching between invasion and proliferation downstream of TGFβ in claudin-low breast tumor cells. Oncogene 34, 2721–2731 (2015). https://doi.org/10.1038/onc.2014.226
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DOI: https://doi.org/10.1038/onc.2014.226
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