Reference Detail

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	Vol	Issue	Date	Pages	Journal Short Title
Cancer research	75	24	2015 Dec 15	5355-66	Cancer Res

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	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
BRAF V600E	glioblastoma	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
BRAF V600E	glioblastoma	conflicting	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	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