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Inhibition of glioblastoma cell proliferation, migration and invasion by the proteasome antagonist carfilzomib

Glioblastoma multiforme is the most aggressive and lethal tumor of the central nervous system with limited treatment strategies on offer, and as such the identification of effective novel therapeutic agents is paramount. To examine the efficacy of proteasome inhibitors, we tested bortezomib, carfilzomib, nafamostat mesylate, gabexate mesylate and acetylsalicylic acid on glioblastoma cell viability, migration and invasion. Both bortezomib and carfilzomib produced significant reduction of cell viability, while nafamostat mesylate, gabexate mesylate and acetylsalicylic acid did not. Subsequent testing showed that carfilzomib significantly reduced cell viability at nM concentrations. Carfilzomib also reduced cell migration, secretion and activation of MMP2 and also cell invasion of all four glioblastoma cells tested. In summary, carfilzomib represents a novel, yet FDA-approved agent for the treatment of glioblastoma multiforme.

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Serine/threonin kinase