Journal
ONCOTARGET
Volume 7, Issue 39, Pages 63138-63157Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.11257
Keywords
glycosylation; bladder cancer; hypoxia; invasion; sialyl-Tn
Categories
Funding
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BD/111242/2015, SFRH/BD/103571/2014, SFRH/BD/105355/2014, SFRH/BPD/66288/2009, SFRH/BPD/101827/2014]
- FCT/MEC
- FEDER [UID/MULTI/04378/2013 - POCI/01/0145/FERDER/007728]
- European Social Fund (ESF) under Human Potential Operation Programme (POPH) from National Strategic Reference Framework (NSRF)
- Portuguese Association for Urology
- Pfizer research grant
- Portuguese Institute for Oncology of Porto
- FCT - FEDER through the Operational Programme for Competitiveness Factors-COMPETE [PTDC/BBB-EBI/0786/2012]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/105355/2014, SFRH/BPD/101827/2014, SFRH/BD/103571/2014] Funding Source: FCT
Ask authors/readers for more resources
Invasive bladder tumours express the cell-surface Sialyl-Tn (STn) antigen, which stems from a premature stop in protein O-glycosylation. The STn antigen favours invasion, immune escape, and possibly chemotherapy resistance, making it attractive for target therapeutics. However, the events leading to such deregulation in protein glycosylation are mostly unknown. Since hypoxia is a salient feature of advanced stage tumours, we searched into how it influences bladder cancer cells glycophenotype, with emphasis on STn expression. Therefore, three bladder cancer cell lines with distinct genetic and molecular backgrounds (T24, 5637 and HT1376) were submitted to hypoxia. To disclose HIF-1 alpha-mediated events, experiments were also conducted in the presence of Deferoxamine Mesilate (Dfx), an inhibitor of HIF-1 alpha proteasomal degradation. In both conditions all cell lines overexpressed HIF-1 alpha and its transcriptionally-regulated protein CA-IX. This was accompanied by increased lactate biosynthesis, denoting a shift toward anaerobic metabolism. Concomitantly, T24 and 5637 cells acquired a more motile phenotype, consistent with their more mesenchymal characteristics. Moreover, hypoxia promoted STn antigen overexpression in all cell lines and enhanced the migration and invasion of those presenting more mesenchymal characteristics, in an HIF-1 alpha-dependent manner. These effects were reversed by reoxygenation, demonstrating that oxygen affects O-glycan extension. Glycoproteomics studies highlighted that STn was mainly present
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available