1. Increased levels of the HER1 adaptor protein Rukl/CIN85 contribute to breast cancer malignancy
- Author
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Olga Basaraba, Thomas Kietzmann, Kseniya Palyvoda, Halyna Shuvayeva, Oksana Mayevska, Yuriy Rzhepetsky, Anatoliy Samoylenko, Bozhena Vynnytska-Myronovska, Nataliya Volodko, Nadiya Byts, Nina Kozlova, Yaroslav Bobak, Volodymyr Savran, Vladimir L. Buchman, Lyudmyla Drobot, Ganna Pasichnyk, Maryna Barska, Valeriy V. Lyzogubov, and Vasyl Usenko
- Subjects
Cancer Research ,Akt/PKB signaling pathway ,MAP Kinase Signaling System ,Breast Neoplasms ,General Medicine ,Biology ,Adenocarcinoma ,medicine.disease_cause ,Oncogene Protein pp60(v-src) ,Epidermal growth factor ,Cell Movement ,Cancer research ,medicine ,Cell Adhesion ,Humans ,Female ,Signal transduction ,Cell adhesion ,Carcinogenesis ,Protein kinase B ,Proto-Oncogene Proteins c-akt ,PI3K/AKT/mTOR pathway ,Proto-oncogene tyrosine-protein kinase Src ,Adaptor Proteins, Signal Transducing ,Signal Transduction - Abstract
The adaptor protein regulator for ubiquitous kinase/c-Cbl-interacting protein of 85kDa (Ruk/CIN85) was found to modulate HER1/EGFR signaling and processes like cell adhesion and apoptosis. Although these features imply a role in carcinogenesis, it is so far unknown how and by which molecular mechanisms Ruk/CIN85 could affect a certain tumor phenotype. By analyzing samples from breast cancer patients, we found high levels of Ruk(l)/CIN85 especially in lymph node metastases from patients with invasive breast adenocarcinomas, suggesting that Ruk(l)/CIN85 contributes to malignancy. Expression of Ruk(l)/CIN85 in weakly invasive breast adenocarcinoma cells deficient of Ruk(l)/CIN85 indeed converted them into more malignant cells. In particular, Ruk(l)/CIN85 reduced the growth rate, decreased cell adhesion, enhanced anchorage-independent growth, increased motility in both transwell migration and wound healing assays as well as affected the response to epidermal growth factor. Thereby, Ruk(l)/CIN85 led to a more rapid and prolonged epidermal growth factor-dependent activation of Src, Akt and ERK1/2 and treatment with the Src inhibitor PP2 and the PI3K inhibitor LY294002 abolished the Ruk(l)/CIN85-dependent changes in cell motility. Together, this study indicates that high levels of Ruk(l)/CIN85 contribute to the conversion of breast adenocarcinoma cells into a more malignant phenotype via modulation of the Src/Akt pathway.
- Published
- 2012