Abstract
N-linked glycosylation (NLG) is a co-translational modification that is essential for the folding, stability, and trafficking of transmembrane (TM) and secretory glycoproteins. Efficient NLG requires the stepwise synthesis and en bloc transfer of a 14-sugar carbohydrate known as a lipid-linked oligosaccharide (LLO). The genetics of LLO biosynthesis have been established in yeast and Chinese hamster systems, but human models of LLO biosynthesis are lacking. In this study we report that Kato III human gastric cancer cells represent a model of deficient LLO synthesis, possessing a homozygous deletion of the LLO biosynthesis factor, MPDU1. Kato III cells lacking MPDU1 have all the hallmarks of a glycosylation-deficient cell line, including altered sensitivity to lectins and the formation of truncated LLOs. Analysis of transcription using an expression microarray and protein levels using a proteome antibody array reveal changes in the expression of several membrane proteins, including the metalloprotease ADAM-15 and the cell adhesion molecule CEACAM1. Surprisingly, the restoration of MPDU1 expression in Kato III cells demonstrated a clear phenotype of increased cell-cell adhesion, a finding that was confirmed in vivo through analysis of tumor xenografts. These experiments also confirmed that protein levels of CEACAM-1, which functions in cell adhesion, is dependent on LLO biosynthesis in vivo. Kato III cells and the MPDU1-rescued Kato IIIM cells therefore provide a novel model to examine the consequences of defective LLO biosynthesis both in vitro and in vivo.
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Abbreviations
- LLO :
-
Lipid-linked oligosaccharide
- NLG :
-
N-linked glycosylation
- ER :
-
Endoplasmic reticulum
- CHO :
-
Chinese hamster ovary
- CDG :
-
Congenital disorder of glycosylation
- MPDU :
-
Mannose-P-dolichol utilization
- Man :
-
Mannose
- GlcNac :
-
N-acetylglucosamine
- FACE :
-
Fluorophore-assisted carbohydrate electrophoresis
- CNV :
-
Copy number variation
- H&E :
-
Hematoxylin and eosin
- PBS :
-
Phosphate-buffered sailne
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This work was supported by grants from the National Institutes of Health (5RO1CA172391) and the National Research Service Award (postdoctoral training grant #T32CA009259).
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Bennett, D.C., Cazet, A., Charest, J. et al. MPDU1 regulates CEACAM1 and cell adhesion in vitro and in vivo. Glycoconj J 35, 265–274 (2018). https://doi.org/10.1007/s10719-018-9819-6
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DOI: https://doi.org/10.1007/s10719-018-9819-6