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Direct interaction between surface β1,4-galactosyltransferase 1 and epidermal growth factor receptor (EGFR) inhibits

Wenqing Tang1, Shuqiang Weng, Si Zhang

  • 1Department of Gastroenterology and Hepatology of Zhongshan Hospital, Fudan University, Shanghai 200032, China.

Biochemical and Biophysical Research Communications
|April 16, 2013
PubMed

Insights

Cell surface galactosyltransferase 1 (β1,4GT1) interacts with epidermal growth factor receptor (EGFR) in hepatocellular carcinoma cells. This interaction inhibits EGFR activation, impacting cell survival signaling pathways.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Previous studies indicated cell surface β1,4-galactosyltransferase 1 (β1,4GT1) negatively regulates cell survival in hepatocellular carcinoma (HCC) by modulating the epidermal growth factor receptor (EGFR) pathway.
  • The precise molecular mechanism underlying this regulation remained unclear.

Purpose of the Study:

  • To elucidate the interaction mechanism between β1,4GT1 and EGFR in HCC.
  • To determine how β1,4GT1 influences EGFR signaling and activation.

Main Methods:

  • GST pull-down assays for in vitro interaction.
  • Co-immunoprecipitation for in vivo binding confirmation.
  • Confocal laser scanning microscopy for co-localization studies.
  • (125)I-EGF binding assays and Western blot analysis to assess EGFR activation.

Main Results:

  • β1,4GT1 was shown to interact with EGFR both in vitro and in vivo.
  • Co-localization of β1,4GT1 and EGFR was observed on the cell surface.
  • Overexpression of β1,4GT1 inhibited EGF binding to EGFR, reducing EGFR dimerization and phosphorylation.
  • Knockdown of β1,4GT1 led to increased EGFR dimerization and phosphorylation.

Conclusions:

  • Cell surface β1,4GT1 directly interacts with EGFR.
  • This interaction inhibits EGFR activation, suggesting a novel regulatory mechanism in HCC cell signaling and survival.

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