Inositol Polyphosphate-5-Phosphatase F (INPP5F) inhibits STAT3 activity and suppresses gliomas tumorigenicity

Sci Rep. 2014 Dec 5;4:7330. doi: 10.1038/srep07330.

Abstract

Glioblastoma (GBM), the most common type of primary malignant brain tumors harboring a subpopulation of stem-like cells (GSCs), is a fast-growing and often fatal tumor. Signal Transducer and Activator of Transcription 3 (STAT3) is one of the major signaling pathways in GSCs maintenance but the molecular mechanisms underlying STAT3 deregulation in GSCs are poorly defined. Here, we demonstrate that Inositol Polyphosphate-5-Phosphatase F (INPP5F), one of the polyphosphoinositide phosphatases, is differentially expressed in GSCs from glioma patients, and is identified as an inhibitor of STAT3 signaling via interaction with STAT3 and inhibition of its phosphorylation. Constitutively expressed INPP5F showed to suppress self-renewal and proliferation potentials of glioblastoma cells and reduced tumorigenicity of glioblastoma. In addition, loss of INPP5F gene in gliomas is significantly correlated with lower overall patient survivals. These findings suggest that INPP5F is a potential tumor suppressor in gliomas via inhibition of STAT3 pathway, and that deregulation of INPP5F may lead to contribution to gliomagenesis.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Brain Neoplasms / metabolism*
  • Brain Neoplasms / mortality*
  • Carcinogenesis / metabolism
  • Cell Proliferation
  • Cell Survival
  • Glioblastoma / metabolism*
  • Glioblastoma / mortality*
  • Humans
  • Inositol Polyphosphate 5-Phosphatases
  • Phosphoric Monoester Hydrolases / metabolism*
  • Phosphorylation
  • Risk Assessment
  • STAT3 Transcription Factor / metabolism*
  • Signal Transduction
  • Survival Rate
  • United States / epidemiology

Substances

  • STAT3 Transcription Factor
  • STAT3 protein, human
  • Phosphoric Monoester Hydrolases
  • INPP5F protein, human
  • Inositol Polyphosphate 5-Phosphatases