NG2 expression in glioblastoma identifies an actively proliferating population with an aggressive molecular signature

M. Talal F. Al-Mayhani, Richard Grenfell, Masashi Narita, Sara Piccirillo, Emma Kenney-Herbert, James W. Fawcett, Peter V. Collins, Koichi Ichimura, Colin Watts

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Glioblastoma multiforme (GBM) is the most common type of primary brain tumor and a highly malignant and heterogeneous cancer. Current conventional therapies fail to eradicate or curb GBM cell growth. Hence, exploring the cellular and molecular basis of GBM cell growth is vital to develop novel therapeutic approaches. Neuroglia (NG)-2 is a transmembrane proteoglycan expressed by NG21 progenitors and is strongly linked to cell proliferation in the normal brain. By using NG2 as a biomarker we identify a GBM cell population (GBM NG21 cells) with robust proliferative, clonogenic, and tumorigenic capacity. We show that a significant proportion (mean 83%) of cells proliferating in the tumor mass express NG2 and that over 50% of GBM NG21 cells are proliferating. Compared with the GBM NG22 cells from the same tumor, the GBM of NG21 cells overexpress genes associated with aggressive tumorigenicity, including overexpression of Mitosis and Cell Cycling Module genes (e.g., MELK, CDC, MCM, E2F), which have been previously shown to correlate with poor survival in GBM. We also show that the coexpression pattern of NG2 with other glial progenitor markers in GBM does not recapitulate that described in the normal brain. The expression of NG2 by such an aggressive and actively cycling GBM population combined with its location on the cell surface identifies this cell population as a potential therapeutic target in a subset of patients with GBM.

Original languageEnglish (US)
Pages (from-to)830-845
Number of pages16
JournalNeuro-oncology
Volume13
Issue number8
DOIs
StatePublished - Aug 2011

Keywords

  • Glioblastoma
  • Molecular signature
  • NG2
  • Progenitor
  • Proliferation

ASJC Scopus subject areas

  • Oncology
  • Clinical Neurology
  • Cancer Research

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    Al-Mayhani, M. T. F., Grenfell, R., Narita, M., Piccirillo, S., Kenney-Herbert, E., Fawcett, J. W., Collins, P. V., Ichimura, K., & Watts, C. (2011). NG2 expression in glioblastoma identifies an actively proliferating population with an aggressive molecular signature. Neuro-oncology, 13(8), 830-845. https://doi.org/10.1093/neuonc/nor088