Abstract 5047: The MUC1 membrane-bound mucin increases tumor cell properties and chemoresistance in renal clear cell carcinoma

2016 
Introduction: MUC1, an O-glycoprotein membrane-bound mucin, is overexpressed in renal clear-cell carcinomas (CRCC) with correlation to two major prognostic factors, Tumor-Node-Metastasis stage and nuclear Furhman grade. Previously, we have shown that (i) MUC1 was significantly overexpressed in metastatic CRCC vs non-metastatic CRCC and (ii) MUC1 is a target gene of HIF-1 transcription factor which is a part of the hypoxia pathway, the main renal carcinogenetic pathway. Furthermore, CRCC is highly resistant to common systemic chemotherapies. Material and method: To better understand the roles of MUC1 in CRCC, we used two renal cell lines expressing MUC1 (786-O cells) or not (ACHN cells). 786-O cells were stably transfected with shRNA targeting MUC1 while ACHN cells with full-length MUC1. Proliferation, drug resistance, migration and invasion properties were studied in vitro in the different cellular clones using MTS cell proliferation assay, wound healing assay and Boyden chambers coated with Matrigel, respectively. Signaling pathways were screened by proteome profiler and western blot. Results and discussion: We showed that MUC1 expression was associated with increased invasion and migration properties of renal carcinomatous cells and a decrease of cell-cell interactions. MUC1 overexpressing cells (i) expressed higher levels of anti-apoptotic factors and MDR genes involved in chemoresistance processes and (ii) were more resistant to chemotherapeutic drugs. Conclusion: Our results show that MUC1 plays a role in biological properties of renal cancer cells suggesting important function for this mucin in tumour progression and chemo-resistance. Our data confirm its potential as a therapeutic target in this type of cancer. Citation Format: Kelly Gaudelot, Viviane Gnemmi, Audrey Bouillez, Jean-Baptiste Gibier, Melanie Fanchon, Justine Woszczyk, Brigitte Hemon, Isabelle Van Seuningen, Sebastien Aubert, Michael Perrais. The MUC1 membrane-bound mucin increases tumor cell properties and chemoresistance in renal clear cell carcinoma. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 5047.
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