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Mele, Valentina; Sokol, Lena; Kölzer, Viktor Hendrik; Pfaff, Dennis; Muraro, Manuele Giuseppe; Keller, Irene; Stefan, Zahnd; Centeno, Irene; Terracciano, Luigi Maria; Dawson, Heather; Zlobec, Inti; Iezzi, Giandomenica; Lugli, Alessandro
Oncotarget, 09/2017, Volume: 8, Issue: 41Journal Article
In colorectal cancer (CRC), RHAMM is an independent adverse prognostic factor. The aim of the study was therefore to investigate on the role of RHAMM as a potential direct driver of cell proliferation and migration in CRC cell lines and to identify pathways dependent on RHAMM in human CRC. Proliferation, cell cycle alterations and invasive capacity were tested in two RHAMM- and control- knockdown CRC cell lines by flow cytometry and assays. Tumorigenicity and metastasis formation was assessed in immunodeficient mice. RNA-Seq and immunohistochemistry was performed on six RHAMM+/- primary CRC tumors. , silencing of RHAMM inhibited CRC cell migration and invasion by 50% (p<0.01). , RHAMM knockdown resulted in slower growth, lower tumor size (p<0.001) and inhibition of metastasis (p<0.001). Patients with RHAMM-high CRC had a worse prognosis (p=0.040) and upregulated pathways for cell cycle progression and adhesion turnover. RHAMM overexpression is correlated with increased migration and invasion of CRC cells, leads to larger, fast growing tumors, and its downregulation essentially abolishes metastasis in mouse models. RHAMM is therefore a promising therapeutic target in all CRC stages as its inhibition affects growth and dissemination of the primary CRC as well as the metastases.
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