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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

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

Hong Sug Kim1, Aiguo Li1, Susie Ahn1

  • 1Neuro-Oncology Branch, National Cancer Institute and National Institutes of Neurological Disorders &Stroke, National Institutes of Health, Bethesda, MD 20892, USA.

Scientific Reports
|December 6, 2014
PubMed

Insights

Inositol Polyphosphate-5-Phosphatase F (INPP5F) inhibits glioblastoma stem cell growth by blocking STAT3 signaling. Loss of INPP5F correlates with reduced survival, suggesting its role as a tumor suppressor in gliomas.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Stem Cell Research

Background:

  • Glioblastoma (GBM) is an aggressive brain tumor characterized by stem-like cells (GSCs).
  • Signal Transducer and Activator of Transcription 3 (STAT3) signaling is crucial for GSC maintenance, but its deregulation mechanisms in GSCs remain unclear.

Purpose of the Study:

  • To investigate the role of Inositol Polyphosphate-5-Phosphatase F (INPP5F) in glioblastoma stem cells (GSCs).
  • To elucidate the molecular mechanisms by which INPP5F affects STAT3 signaling and glioblastoma progression.

Main Methods:

  • Differential expression analysis of INPP5F in GSCs from glioma patients.
  • Investigating the interaction between INPP5F and STAT3, and its effect on STAT3 phosphorylation.
  • Assessing the impact of INPP5F expression on glioblastoma cell self-renewal, proliferation, and tumorigenicity.

Main Results:

  • INPP5F is differentially expressed in GSCs and acts as an inhibitor of STAT3 signaling by preventing its phosphorylation.
  • Constitutive INPP5F expression suppresses glioblastoma cell self-renewal, proliferation, and reduces tumor formation.
  • Loss of INPP5F gene expression in gliomas significantly correlates with decreased overall patient survival.

Conclusions:

  • INPP5F functions as a tumor suppressor in gliomas, primarily through the inhibition of the STAT3 pathway.
  • INPP5F deregulation contributes to gliomagenesis, highlighting its potential as a therapeutic target.

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