Activation of multiple growth factor signalling pathways is frequent in meningiomas

David A. Hilton*, Aditya Shivane, Leanne Kirk, Kayleigh Bassiri, Doyo G. Enki, C. Oliver Hanemann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

A minority of meningiomas are difficult to treat with surgery or radiotherapy, and chemotherapeutic alternatives are limited. This study aims to better understand pathways that are active in meningiomas, in order to direct future treatment strategies. We investigated the expression and activation of multiple growth factor receptors, their ligands and downstream signalling pathways in 30 meningiomas using immunohistochemistry. Expression was correlated with chromosome 22q loss. Membrane expression of VEGF receptor (VEGFR) and platelet-derived growth factor receptor (PDGFR)β was seen in 83% of tumors, Axl in 70%, EGFR in 50% and insulin-like growth factor receptor in 47%. Expression was similar in low- and high-grade tumors, but membrane EGFR expression was not seen in tumors showing chromosome 22q loss (P<0.05). Expression of ligands (IGF, NRG, VEGF, Gas 6), and signalling proteins (Mek, Erk, Jnk, Akt) and pS6RP, was widespread. Western blot confirmed widespread Axl expression and supported selective expression of EGFR in NF2-intact meningiomas. The majority of meningiomas express and show activation of multiple growth factor receptors and their signalling pathways, irrespective of tumor grade. In addition to previously reported receptors, Axl offers a new therapeutic target. The findings also suggest that anti-EGFR based therapies may be less effective in meningiomas with 22q loss.

Original languageEnglish
Pages (from-to)250-261
Number of pages12
JournalNeuropathology
Volume36
Issue number3
DOIs
Publication statusPublished - 1 Jun 2016

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Neurology (clinical)

Keywords

  • Growth factor
  • Meningioma
  • Merlin
  • NF2 gene
  • Protein kinase

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