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Aurisicchio, Luigi; Marra, Emanuele; Luberto, Laura; Carlomosti, Fabrizio; De Vitis, Claudia; Noto, Alessia; Gunes, Zeynep; Roscilli, Giuseppe; Mesiti, Giuseppe; Mancini, Rita; Alimandi, Maurizio; Ciliberto, Gennaro
Journal of cellular physiology, October 2012, Letnik: 227, Številka: 10Journal Article
The role of the ErbB3 receptor in signal transduction is to augment the signaling repertoire of active heterodimeric ErbB receptor complexes through activating the PI3K/AKT pathway, which in turn promotes survival and proliferation. ErbB3 has recently been proposed to be involved in acquired resistance to tyrosine kinase inhibitors (TKIs), and is therefore a promising new drug cancer target. Since ErbB3 is a kinase defective receptor, it cannot be targeted by small molecule inhibitors, whereas monoclonal antibodies may offer a viable strategy for pharmacological intervention. In this study, we have utilized DNA electroporation (DNA‐EP) to generate a set of novel hybridomas directed against human ErbB3, which have been characterized for their biochemical and functional properties and selected for their ability to negatively regulate the ErbB3‐mediated signaling pathway. In vitro, the anti‐ErbB3 antibodies modulate the growth rate of cancer cells of different origins. In vivo they show antitumoral properties in a xenograft model of human pancreatic tumor and in the ErbB2‐driven carcinogenesis genetically engineered mouse model (GEMM) for mammary tumor, the BALB/neuT. Our data confirm that downregulating the ErbB3‐mediated signals with the use of anti‐ErbB3 monoclonal antibodies is both feasible and relevant for therapeutic purposes and provides new opportunities for novel anti‐ErbB3 combinatory strategies for cancer treatment. J. Cell. Physiol. 227: 3381–3388, 2012. © 2011 Wiley Periodicals, Inc.
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