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CD317 Activates EGFR by Regulating Its Association with Lipid Rafts

Guizhong Zhang1, Xin Li1, Qian Chen1

  • 1Shenzhen Laboratory of Fully Human Antibody Engineering, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, People's Republic of China.

Cancer Research
|March 21, 2019
PubMed

Insights

CD317 activates epidermal growth factor receptor (EGFR) in liver cancer cells by altering EGFR

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Epidermal growth factor receptor (EGFR) is crucial for cellular functions, and its overactivation drives cancer.
  • Resistance to anti-EGFR therapies necessitates understanding EGFR activation mechanisms.

Purpose of the Study:

  • To investigate the role of CD317 in EGFR activation within hepatocellular carcinoma (HCC).
  • To elucidate the mechanism by which CD317 influences EGFR localization and activity.

Main Methods:

  • Investigated CD317 expression and its correlation with EGFR in HCC cells and patient samples.
  • Utilized cell-based assays to examine CD317's effect on EGFR localization within lipid rafts.
  • Analyzed downstream signaling pathways (Ras-Raf-MEK-ERK, JAK-STAT) activated by CD317-mediated EGFR signaling.
  • Employed HCC mouse models to validate findings in vivo.

Main Results:

  • CD317 is upregulated in HCC cells and promotes cell-cycle progression and tumorigenesis dependent on EGFR.
  • CD317 releases EGFR from lipid rafts, leading to EGFR activation and downstream signaling.
  • CD317 upregulation correlates with EGFR activation in HCC mouse models and patient tissues.

Conclusions:

  • CD317 activates EGFR in hepatocellular carcinoma by modulating its plasma membrane localization.
  • CD317 represents a novel regulatory mechanism for EGFR and a potential therapeutic target for EGFR-driven cancers.

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