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Objective: Glioblastoma multiforme (GBM) is characterized by a strong self-renewal potential and poor differentiated state. We previously reported that (pro)renin receptor (PRR) was a potential target for glioma therapy by silencing the gene of PRR. Here, we have developed the monoclonal antibody of PRR and examined their effects on GBM. Materials and methods: We performed immunohistochemical analysis to detect the protein expression of PRR and SOX-2 in human sample of 56 gliomas. We used human glioma cell lines (U251MG and U87MG) and glioma stem cell line (MGG23) in vitro study. PRR antibody was designed to target the extracellular domain of the PRR with the rat lymph node method. Expression of the Wnt signaling components and stem marker (SOX-2, Oct3/4) in human glioma cell lines and glioma stem cell line treated with PRR antibody were measured using Western blotting. The effects of PRR antibody on cell proliferation, sphere formation, apoptosis, invasion were also examined. Subcutaneous xenografts with U87MG were induced in nude mice. Results: PRR expression showed a positive correlation with SOX-2 expression in glioma samples. Treatment with PRR antibody significantly reduced expression of Wnt signaling components and stem marker. We observed that PRR antibody significantly reduced cell proliferation and decreased sphere formation. Furthermore, PRR antibody suppressed invasion and induced apoptosis. In a subcutaneous U87MG xenograft model, systemic administration of the PRR antibody significantly reduced the size of the tumor volume. Conclusion: PRR has important role for the maintenance of stem cells and contribute to stem cell proliferation. PRR antibody inhibits cell proliferation and cell invasion and induces apoptosis. Treatment with PRR antibody could be an attractive therapeutic strategy for GBM.

CBMS-12 Pro renin receptor antibody regulates glioblastoma stemness