Abstract
In carcinomas such as those of breast, pancreas, stomach, and colon, cancer cells support the expansion of molecular and cellular stroma in a phenomenon termed desmoplasia, which is characterized by a strong fibrotic response. In the case of breast tissue, in which stroma is mainly a fatty tissue, this response presumably occurs at the expense of the adipose cells, the most abundant stromal phenotype, generating a tumoral fibrous structure rich in fibroblast-like cells. In this study, we aimed to determine the cellular mechanisms by which factors present in the media conditioned by MDA-MB-231 and MCF-7 human breast cancer cell lines induce a reversion of adipose cells to a fibroblastic phenotype. We demonstrated that soluble factors generated by these cell lines stimulated the reversion of mammary adipose phenotype evaluated as intracellular lipid content and expression of C/EBPα and PPARγ. We also demonstrated that exogenous TGF-β1 and TNF-α exerts a similar function. The participation of both growth factors, components of media conditioned by tumoral mammary cells, on the expression and nuclear translocation of C/EBPα and PPARγ was tested in 3T3-L1 cells by interfering with the inhibitory effects of media with agents that block the TGF-β1 and TNF-α activity. These results allow us to postulate that TGF-β1 and TNF-α present in this media are in part responsible for this phenotypic reversion.
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Acknowledgments
This work was supported by the grant (1080196 to JM) from the Fondo Nacional de Ciencia y Tecnología (FONDECYT) of Chile.
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Guerrero, J., Tobar, N., Cáceres, M. et al. Soluble factors derived from tumor mammary cell lines induce a stromal mammary adipose reversion in human and mice adipose cells. Possible role of TGF-β1 and TNF-α. Breast Cancer Res Treat 119, 497–508 (2010). https://doi.org/10.1007/s10549-009-0491-1
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DOI: https://doi.org/10.1007/s10549-009-0491-1