Investigation of PIMREG interactome in glioblastoma cell lines upon DNA damage caused by temozolomide

Abstract

PIMREG, a protein associated with cellular proliferation, is highly expressed in many types of cancer, in particular glioblastoma (GBM). This type of cancer, which affects the central nervous system, is associated with poor prognostic in patients and reoccurs in most cases after surgical resection and chemotherapy, showing resistance, possibly through activation of DNA damage response (DDR). Recent data from our group revealed that genotoxic agents induce PIMREG expression. Moreover, its silencing renders GBM cells sensitive to temozolomide (TMZ) treatment and affects ATR- and ATM-dependent signaling. Thus, PIMREG is involved in DDR and resistance of GBM cells to TMZ. However, where PIMREG might be placed in DNA damage signaling is unknown. Therefore, this study aims to investigate the PIMREG interactome in TMZ-treated GBM cells by mass spectrometry analysis, and identify the DDR regulatory network in which PIMREG participates. (AU)