Effects of Global O-GlcNAcylation on Galectin Gene-expression Profiles in Human Cancer Cell Lines
Ali A Sherazi1, Komal A Jariwala1, Amanda N Cybulski1
1Department of Biology, The University of Western Ontario, London, ON, Canada.
Background/Aim:
The effects of O-linked β-N-acetyl-D-glucosamine (O-GlcNAc) transferase (OGT) and O-GlcNAcase (OGA) inhibitors on galectin gene expression profiles were examined in MCF7, HT-29, and HL-60 cancer cell lines.
Materials And Methods:
Cell cultures were treated for 24 h with OGA inhibitor thiamet G or OGT inhibitor 2-acetamido-1,3,4,6-tetra-O-acetyl-2-deoxy-5-thio-α-D-glucopyranose, and global O-GlcNAc levels and expression of galectin genes were determined using an immunodot blot assay and real-time quantitative polymerase chain reaction.
Results:
Two galectin genes, LGALS3 in MCF7 cells and LGALS12 in HL-60 cells, were up-regulated by O-GlcNAc, whereas other cell-specific galectins were unresponsive to changes in O-GlcNAc level. Of interest, basal levels of O-GlcNAc in resting HL-60 and HT-29 cells were significantly higher than those in cells differentiated into neutrophilic or enterocytic lineages, respectively.
Conclusion:
O-GlcNAc-mediated signaling pathways may be involved in regulating the expression of only a limited number of galectin genes. Additional O-GlcNAc-dependent mechanisms may work at the protein level (galectin secretion and intracellular localization) and warrant further investigation.
Insights
Inhibitors of O-linked β-N-acetyl-D-glucosamine (O-GlcNAc) transferase (OGT) and O-GlcNAcase (OGA) selectively modulated galectin gene expression. O-GlcNAc signaling impacts a limited set of galectin genes, suggesting protein-level regulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- O-linked β-N-acetyl-D-glucosamine (O-GlcNAc) is a dynamic post-translational modification regulating diverse cellular processes.
- Galectins are a family of β-galactoside-binding proteins implicated in cancer progression and immune responses.
Purpose of the Study:
- To investigate the impact of O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA) inhibition on galectin gene expression profiles in human cancer cell lines.
- To elucidate the role of O-GlcNAc signaling in the regulation of galectin gene expression.
Main Methods:
- MCF7, HT-29, and HL-60 cancer cell lines were treated with OGT or OGA inhibitors.
- Global O-GlcNAc levels were assessed using immunodot blot assays.
- Galectin gene expression was quantified using real-time quantitative polymerase chain reaction (RT-qPCR).
Main Results:
- O-GlcNAc significantly up-regulated LGALS3 in MCF7 cells and LGALS12 in HL-60 cells.
- Other cell-specific galectins showed no significant response to altered O-GlcNAc levels.
- Basal O-GlcNAc levels were higher in resting HL-60 and HT-29 cells compared to differentiated cells.
Conclusions:
- O-GlcNAc-mediated signaling pathways appear to regulate a restricted subset of galectin genes.
- Further research is warranted to explore O-GlcNAc-dependent mechanisms at the protein level, including galectin secretion and localization.
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