Insights into glycan biosynthesis in chemically-induced hepatocellular carcinoma in rats: A glycomic analysis

Amr Amin, Asma Bashir, Nazar Zaki, Diane McCarthy, Sanjida Ahmed, Mohamed Lotfy

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

AIM: To evaluate the qualitative and quantitative changes in N-linked glycosylation, which occurred in association with diethyl nitrosamine-induced hepatocellular carcinoma (HCC) in rodents. METHODS: Liver tissues of (1) normal (non-tumorbearing) rats; and (2) tumor-bearing rats; were collected and were used for histological and GlycanMap® analyses. Briefly, GlycanMap® analysis is a high-throughput assay that provides a structural and quantitative readout of protein-associated glycans using a unique, automated 96-well assay technology coupled to matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and custom bioinformatics. Histopathological studies were carried out to ensure the development of HCC in the tested animals. RESULTS: The N-glycomic analysis revealed 5 glycans; Glc1Man9GlcNAc2, Gal2Man3GlcNac4Fuc1Neu1, Man4GlcNac2, Gal2Man3GlcNac4Neu3OAc3, and Man3GlcNac5Fuc1, which showed significant changes in rat HCC tissues when compared with normal liver tissues. Four glycans were increased (P < 0.05) and Glc1Man9GlcNAc2 was decreased (5.89 ± 0.45 vs 3.54 ± 0.21, P < 0.01) in HCC tissues compared to normal liver tissues. An increase (66.5 ± 1.05 vs 62.7 ± 1.1, P < 0.05) in high-mannose structures in HCC rats was observed compared to normal rats. Importantly, HCC rats showed an increase (P < 0.05) in both tumor-associated carbohydrates and in branched glycans. The changes in glycans correlated well with glycan flow changes reported in the glycan biosynthetic pathway, which indicates the importance of enzyme activities involved in glycan synthesis at different subcellular localizations. CONCLUSION: The reported HCC-associated changes in glycan flow and subcellular localization explain the increase in high mannose glycans and siayl Lewis glycans common in HCC liver tissues.

Original languageEnglish
Pages (from-to)6167-6179
Number of pages13
JournalWorld Journal of Gastroenterology
Volume21
Issue number20
DOIs
Publication statusPublished - May 28 2015

Keywords

  • Biosynthetic pathways
  • Glycomics
  • Hepatocellular carcinoma
  • Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

ASJC Scopus subject areas

  • Gastroenterology

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