Journal
FASEB JOURNAL
Volume 24, Issue 10, Pages 3796-3808Publisher
FEDERATION AMER SOC EXP BIOL
DOI: 10.1096/fj.10-157347
Keywords
breast cancer; tumorigenesis; invasion; metastasis; signaling
Categories
Funding
- Association for International Cancer Research (AICR)
- AIRC, Associazione Italiana Ricerca Cancro
- EU
- Ministero Universita e Ricerca
- Programma di Ricerca di Rilevante Interesse Nazionale
- Regione Piemonte-Progetti Sanita
- Oncoprot
- Piattaforma Staminali
- Druidi
- Comitato Interministeriale per la Programmazione Economica, Compagnia San Paolo, Progetto Alfieri-Fondazione Cassa Risparmio Torino, Turin, Italy
- European Molecular Biology Organization
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The ErbB2 oncogene is often overexpressed in breast tumors and associated with poor clinical outcome. p130Cas represents a nodal scaffold protein regulating cell survival, migration, and proliferation in normal and pathological cells. The functional role of p130Cas in ErbB2-dependent breast tumorigenesis was assessed by its silencing in breast cancer cells derived from mouse mammary tumors overexpressing ErbB2 (N202-1A cells), and by its reexpression in ErbB2-transformed p130Cas-null mouse embryonic fibroblasts. We demonstrate that p130Cas is necessary for ErbB2-dependent foci formation, anchorage-independent growth, and in vivo growth of orthotopic N202-1A tumors. Moreover, intranipple injection of p130Cas-stabilized siRNAs in the mammary gland of Balbc-NeuT mice decreases the growth of spontaneous tumors. In ErbB2-transformed cells, p130Cas is a crucial component of a functional molecular complex consisting of ErbB2, c-Src, and Fak. In human mammary cells, MCF10A. B2, the concomitant activation of ErbB2, and p130Cas overexpression sustain and strengthen signaling, leading to Rac1 activation and MMP9 secretion, thus providing invasive properties. Consistently, p130Cas drives N202-1A cell in vivo lung metastases colonization. These results demonstrate that p130Cas is an essential transducer in ErbB2 transformation and highlight its potential use as a novel therapeutic target in ErbB2 positive human breast cancers.-Cabodi, S., Tinnirello, A., Bisaro, B., Tornillo, G., Camacho-Leal, M. P., Forni, G., Cojoca, R., Iezzi, M., Amici, A., Montani, M., Eva, A., Di Stefano, P., Muthuswamy, S. K., Tarone, G., Turco, E., Defilippi, P. p130Cas is an essential transducer element in ErbB2 transformation. FASEB J. 24, 3796-3808 (2010). www.fasebj.org
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