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Leconet, Wilhem; Chentouf, Myriam; du Manoir, Stanislas; Chevalier, Clément; Sirvent, Audrey; Aït-Arsa, Imade; Busson, Muriel; Jarlier, Marta; Radosevic-Robin, Nina; Theillet, Charles; Chalbos, Dany; Pasquet, Jean-Max; Pèlegrin, André; Larbouret, Christel; Robert, Bruno
Clinical cancer research, 06/2017, Volume: 23, Issue: 11Journal Article
AXL receptor tyrosine kinase has been described as a relevant molecular marker and a key player in invasiveness, especially in triple-negative breast cancer (TNBC). We evaluate the antitumor efficacy of the anti-AXL monoclonal antibody 20G7-D9 in several TNBC cell xenografts or patient-derived xenograft (PDX) models and decipher the underlying mechanisms. In a dataset of 254 basal-like breast cancer samples, genes correlated with expression are enriched in EMT, migration, and invasion signaling pathways. Treatment with 20G7-D9 inhibited tumor growth and bone metastasis formation in AXL-positive TNBC cell xenografts or PDX, but not in AXL-negative PDX, highlighting AXL role in cancer growth and invasion. stimulation of AXL-positive cancer cells by its ligand GAS6 induced the expression of several EMT-associated genes ( , and ) through an intracellular signaling implicating the transcription factor FRA-1, important in cell invasion and plasticity, and increased their migration/invasion capacity. 20G7-D9 induced AXL degradation and inhibited all AXL/GAS6-dependent cell signaling implicated in EMT and in cell migration/invasion. The anti-AXL antibody 20G7-D9 represents a promising therapeutic strategy in TNBC with mesenchymal features by inhibiting AXL-dependent EMT, tumor growth, and metastasis formation. .
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