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Carcinogenesis Advance Access originally published online on June 23, 2005
Carcinogenesis 2005 26(11):1868-1878; doi:10.1093/carcin/bgi158
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Carcinogenesis vol.26 no.11 © Oxford University Press 2005; all rights reserved.

Mammary carcinoma provides highly tumourigenic and invasive reactive stromal cells

Mirco Galiè *, Carlo Sorrentino 1, Maura Montani 2, Luigi Micossi 2, Emma Di Carlo 1, Tommaso D'Antuono 1, Laura Calderan, Pasquina Marzola, Donatella Benati, Flavia Merigo, Fiorenza Orlando 3, Arianna Smorlesi 3, Cristina Marchini 2, Augusto Amici 2 and Andrea Sbarbati

Department of Morphological and Biomedical Sciences, Section Anatomy and Histology, University of Verona, Verona, Italy, 1 Department of Oncology and Neuroscience, Section Surgical Pathology, University of Chieti, Chieti, Italy, 2 Department of Molecular, Cellular and Animal Biology, Genetic Immunization laboratory, University of Camerino, Camerino, Italy and 3 Department of INRCA Gerontology Research, Immunology Center, Ancona, Italy

* To whom correspondence should be addressed. Tel: +39 045 8027265; Fax: +39 045 8027163; Email: mirco{at}anatomy.univr.it

Correspondence may also be addressed to A.Amici. Tel: +39 0737 403275; Fax: +39 0737 636216; Email: augusto.amici{at}unicam.it

The progression of a lesion to a carcinoma is dependent on the engagement of ‘reactive stroma’ that provides structural and vascular support for tumour growth and also leads to tissue reorganization and invasiveness. The composition of reactive stroma closely resembles that of granulation tissue, and myofibroblasts are thought to play a critical role in driving the stromal reaction of invasive tumours as well as of physiological wound repair. In the present work, we established a myofibroblast-like cell line, named A17, from a mouse mammary carcinoma model in which tumourigenesis is triggered in a single step by the overexpression of HER-2/neu transgene in the epithelial compartment of mammary glands. We showed that although they derived from a tumour of epithelial origin and did not express HER-2/neu transgene, their subcutaneous injection into the backs of syngeneic mice gave rise to sarcomatoid tumours which expressed alpha-smooth muscle actin at the invasive edge. The expression of cytokeratin 14 suggested a myoepithelial origin but immunophenotypical profile, invasive and neoangiogenic potential of A17 cells and tumours showed many similarities with the reactive stroma that occurs in wound repair and in cancerogenesis. Our results suggest that epithelial tumours have the potential to develop highly tumourigenic and invasive reactive stromal cells and our cell line represents a novel, effective model for studying epithelial-stromal interaction and the role of myofibroblasts in tumour development.


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