The epidermal growth factor receptor is associated with phospholipase C-γ1 in meningiomas

Mahlon D. Johnson, Megumi Horiba, Angela R. Winnier, Carlos L. Arteaga

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

In this study we evaluated phospholipase C-γ1 (PLC-γ1) expression, activity, and association with the epidermal growth factor (EGF) receptor in a series of human meningiomas as well as cultured meningioma cells. Phospholipase C-γ1 was detectable by immunoblot and immunohistochemistry in 13 of 13 meningioma specimens. Epidermal growth factor receptors were detected by immunoblot in six of nine meningiomas (67%) and by immunohistochemistry in 13 of 19 meningiomas (68%) but not in normal leptomeningeal cells. In two of three meningiomas EGF receptors and/or a 170-kd phosphotyrosine band precipitated with a PLC-γ1 antiserum. Both PLC-γ1 and EGF receptors also exhibited the same pattern of immunostaining on meningioma tissue sections. Phospholipase C-γ1 catalytic activity, measured in a PIP2 hydrolysis assay, was higher in nine EGF receptor-positive meningiomas than in six EGF receptor-negative meningiomas (P = .05; t test). Finally, treatment of cultured meningioma cells with transforming growth factor-α induced a 78% increase in PLC-γ1 catalytic activity. Thus, these data are consistent with the possibility that the EGF receptor tyrosine kinase regulates PLC-γ1 activity in native meningioma tissue.

Original languageEnglish (US)
Pages (from-to)146-153
Number of pages8
JournalHuman Pathology
Volume25
Issue number2
DOIs
StatePublished - Feb 1994

Keywords

  • epidermal growth factor receptor
  • meningioma
  • phospholipase C-γ1

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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