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Ref Type Journal Article
PMID (26573800)
Authors Lerner RG, Grossauer S, Kadkhodaei B, Meyers I, Sidorov M, Koeck K, Hashizume R, Ozawa T, Phillips JJ, Berger MS, Nicolaides T, James CD, Petritsch CK
Title Targeting a Plk1-Controlled Polarity Checkpoint in Therapy-Resistant Glioblastoma-Propagating Cells.
Journal Cancer research
Vol 75
Issue 24
Date 2015 Dec 15
URL
Abstract Text The treatment of glioblastoma (GBM) remains challenging in part due to the presence of stem-like tumor-propagating cells that are resistant to standard therapies consisting of radiation and temozolomide. Among the novel and targeted agents under evaluation for the treatment of GBM are BRAF/MAPK inhibitors, but their effects on tumor-propagating cells are unclear. Here, we characterized the behaviors of CD133(+) tumor-propagating cells isolated from primary GBM cell lines. We show that CD133(+) cells exhibited decreased sensitivity to the antiproliferative effects of BRAF/MAPK inhibition compared to CD133(-) cells. Furthermore, CD133(+) cells exhibited an extended G2-M phase and increased polarized asymmetric cell divisions. At the molecular level, we observed that polo-like kinase (PLK) 1 activity was elevated in CD133(+) cells, prompting our investigation of BRAF/PLK1 combination treatment effects in an orthotopic GBM xenograft model. Combined inhibition of BRAF and PLK1 resulted in significantly greater antiproliferative and proapoptotic effects beyond those achieved by monotherapy (P < 0.05). We propose that PLK1 activity controls a polarity checkpoint and compensates for BRAF/MAPK inhibition in CD133(+) cells, suggesting the need for concurrent PLK1 inhibition to improve antitumor activity against a therapy-resistant cell compartment.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E glioblastoma multiforme decreased response PD-0325901 Preclinical - Cell culture Actionable In a preclinical study, a glioblastoma cell line harboring BRAF V600E demonstrated a decreased response to treatment with PD-0325901, demonstrating increased viability of CD133 positive cells in culture (PMID: 26573800). 26573800
BRAF V600E glioblastoma multiforme sensitive BI2536 + PLX4720 Preclinical - Cell line xenograft Actionable In a preclinical study, the combination of BI 2536 and PLX4720 resulted in suppression of downstream signaling, increased apoptotic activity, inhibition of cell proliferation, and tumor growth suppression in glioblastoma cell line xenograft models harboring BRAF V600E (PMID: 26573800). 26573800
Unknown unknown glioblastoma multiforme not applicable BI2536 Preclinical - Cell culture Actionable In a preclinical study, a glioblastoma cell line treated with BI2536 demonstrated decreased cell viability in culture (PMID: 26573800). 26573800
BRAF V600E glioblastoma multiforme sensitive BI2536 Preclinical - Cell culture Actionable In a preclinical study, a glioblastoma cell line harboring BRAF V600E demonstrated sensitivity to BI2536 in culture (PMID: 26573800). 26573800
Unknown unknown glioblastoma multiforme not applicable BI2536 + PD-0325901 Preclinical - Cell culture Actionable In a preclinical study, the combination of BI 2536 and PD-0325901 resulted in greater inhibition of cell proliferation in glioblastoma cells in culture compared to treatment with either agent alone (PMID: 26573800). 26573800
BRAF V600E glioblastoma multiforme decreased response PLX4720 Preclinical - Cell line xenograft Actionable In a preclinical study, a glioblastoma cell line harboring BRAF V600E demonstrated a decreased response to treatment with PLX4720, demonstrating increased viability of CD133 positive cells in culture and in xenograft models (PMID: 26573800). 26573800