N-linked glycosylation at Asn152 on CD147 affects protein folding and stability: promoting tumour metastasis in hepatocellular carcinoma

Sci Rep. 2016 Nov 21:6:35210. doi: 10.1038/srep35210.

Abstract

Cluster of differentiation 147 (CD147), also known as extracellular matrix metalloproteinase inducer, is a transmembrane glycoprotein that mediates oncogenic processes partly through N-glycosylation modifications. N-glycosylation has been demonstrated to be instrumental for the regulation of CD147 function during malignant transformation. However, the role that site-specific glycosylation of CD147 plays in its defective function in hepatocellular carcinomacells needs to be determined. Here, we demonstrate that the modification of N-glycosylation at Asn152 on CD147 strongly promotes hepatocellular carcinoma (HCC) invasion and migration. After the removal of N-glycans at Asn152, CD147 was more susceptible to degradation by ER-localized ubiquitin ligase-mediated endoplasmic reticulum-associated degradation (ERAD). Furthermore, N-linked glycans at Asn152 were required for CD147 to acquire and maintain proper folding in the ER. Moreover, N-linked glycans at Asn152 functioned as a recognition motif that was directly mediated by the CNX quality control system. Two phases in the retention-based ER chaperones system drove ER-localized CD147 trafficking to degradation. Deletion of N-linked glycosylation at Asn152 on CD147 significantly suppressed in situ tumour metastasis. These data could potentially shed light on the molecular regulation of CD147 through glycosylation and provide a valuable means of developing drugs that target N-glycans at Asn152 on CD147.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Asparagine / chemistry*
  • Asparagine / immunology
  • Basigin / chemistry*
  • Basigin / genetics
  • Basigin / immunology
  • Carcinoma, Hepatocellular / genetics*
  • Carcinoma, Hepatocellular / immunology
  • Carcinoma, Hepatocellular / secondary
  • Cell Line, Tumor
  • Endoplasmic Reticulum-Associated Degradation*
  • Gene Expression Regulation, Neoplastic*
  • Glycosylation
  • Humans
  • Liver Neoplasms / genetics*
  • Liver Neoplasms / immunology
  • Liver Neoplasms / pathology
  • Lung Neoplasms / genetics*
  • Lung Neoplasms / immunology
  • Lung Neoplasms / secondary
  • Male
  • Mice
  • Mice, Nude
  • Mutation
  • Neoplasm Transplantation
  • Polysaccharides / chemistry
  • Polysaccharides / immunology
  • Protein Folding
  • Proteolysis

Substances

  • BSG protein, human
  • Polysaccharides
  • Basigin
  • Asparagine