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Updated: Apr 14, 2026

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IGFBP2 potentiates nuclear EGFR-STAT3 signaling.

C Y Chua1,2, Y Liu1,3, K J Granberg1,4,5

  • 1Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.

Oncogene
|April 21, 2015
PubMed
Summary

Insulin-like growth factor binding protein 2 (IGFBP2) promotes cancer by activating epidermal growth factor receptor (EGFR) and signal transducer and activator of transcription factor 3 (STAT3) signaling. Nuclear IGFBP2 enhances glioblastoma invasion, suggesting IGFBP2 as a potential therapeutic target.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Signaling

Background:

  • Insulin-like growth factor binding protein 2 (IGFBP2) is an oncogenic protein with poorly understood tumor-promoting mechanisms.
  • The role of intracellular IGFBP2 in cancer development and progression remains unclear.

Purpose of the Study:

  • To elucidate the tumor-promoting mechanisms of IGFBP2, particularly its intracellular functions.
  • To investigate the link between IGFBP2, epidermal growth factor receptor (EGFR), and signal transducer and activator of transcription factor 3 (STAT3) signaling in cancer.

Main Methods:

  • Investigated the effects of exogenous IGFBP2 and IGFBP2 overexpression on EGFR and STAT3 signaling.
  • Examined the role of nuclear IGFBP2 in EGFR nuclear accumulation and STAT3 activation.
  • Analyzed The Cancer Genome Atlas (TCGA) database for IGFBP2 and STAT3-activated genes in glioma.
  • Correlated IGFBP2, EGFR, and STAT3 levels with patient survival data.

Main Results:

  • IGFBP2 treatment and overexpression aberrantly activate EGFR, leading to STAT3 signaling.
  • IGFBP2 enhances nuclear EGFR accumulation, potentiating STAT3 transactivation via nuclear EGFR signaling.
  • Nuclear IGFBP2 directly promotes invasion and migration in human glioblastoma cells.
  • High levels of IGFBP2, EGFR, and STAT3 correlate with poorer patient survival.

Conclusions:

  • IGFBP2 promotes cancer by activating EGFR/STAT3 signaling and facilitating nuclear EGFR accumulation.
  • Intracellular and nuclear IGFBP2 directly contribute to cancer hallmarks like invasion and migration.
  • IGFBP2 represents a novel therapeutic target for glioma, given the limited success of EGFR-targeted therapies.