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Insulin like growth factor binding protein 4 promotes GBM progression and regulates key factors involved in EMT and

V R Praveen Kumar1, Priyanka Sehgal, Balram Thota

  • 1Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, 560 012, India.

Journal of Neuro-Oncology
|January 8, 2014
PubMed

Insights

Insulin-like growth factor binding protein 4 (IGFBP4) promotes glioma growth and invasion. Elevated IGFBP4 expression in astrocytoma, particularly glioblastoma, correlates with increased tumor progression and cell motility.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Insulin-like growth factor binding protein 4 (IGFBP4) typically inhibits growth by regulating IGF signaling.
  • While often tumor suppressive, IGFBP4 promotes progression in renal cell carcinoma and is upregulated in astrocytoma.
  • The specific role of IGFBP4 in glioma pathogenesis remains largely unexplored.

Purpose of the Study:

  • To investigate the functional role of IGFBP4 in glioma development and progression.
  • To analyze IGFBP4 expression levels across different grades of astrocytoma.
  • To elucidate the molecular mechanisms underlying IGFBP4's function in glioma cells.

Main Methods:

  • Quantitative reverse transcription PCR (qRT-PCR) and immunohistochemistry (IHC) on patient-derived astrocytoma and normal brain tissues.
  • In vitro studies involving IGFBP4 overexpression in U343 glioma cells and knockdown in U251 glioma cells.
  • Assays included proliferation (MTT), migration (transwell), and invasion (Matrigel) assays, alongside Western blot analysis for key molecular markers.

Main Results:

  • IGFBP4 mRNA and protein expression were significantly higher in glioblastoma (GBM) compared to lower-grade astrocytomas and normal brain tissue.
  • Overexpression of IGFBP4 in glioma cells led to increased proliferation, migration, and invasion.
  • IGFBP4 modulated expression of key proteins involved in tumor growth, epithelial-mesenchymal transition (EMT), and invasion, including upregulation of pAkt, pErk, Vimentin, N-cadherin, and downregulation of E-cadherin.

Conclusions:

  • IGFBP4 exhibits a pro-tumorigenic role in glioma, driving tumor growth, proliferation, and metastasis.
  • Elevated IGFBP4 expression is a potential biomarker for higher-grade gliomas and GBM.
  • Targeting IGFBP4 may represent a novel therapeutic strategy for glioma treatment.

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