Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 21, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/ijms21176239
Keywords
pancreatic ductal adenocarcinoma; alpha 2,3-sialyltransferases; sialyl-Lewis antigens; E-selectin; cell migration
Funding
- Spanish Ministry of Science and Innovation [BIO 2015-66356-R]
- University of Girona grant [MPCUdG2016/028]
- AGAUR-Generalitat de Catalunya grant [2014SGR0229]
- Spanish Ministry of Economy and Competitiveness/ISCIII-FEDER [PI17/00199]
- Generalitat de Catalunya [2017-SGR-225]
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Aberrant sialylation is frequently found in pancreatic ductal adenocarcinoma (PDA). alpha 2,3-Sialyltransferases (alpha 2,3-STs) ST3GAL3 and ST3GAL4 are overexpressed in PDA tissues and are responsible for increased biosynthesis of sialyl-Lewis (sLe) antigens, which play an important role in metastasis. This study addresses the effect of alpha 2,3-STs knockdown on the migratory and invasive phenotype of PDA cells, and on E-selectin-dependent adhesion. Characterization of the cell sialome, the alpha 2,3-STs and fucosyltransferases involved in the biosynthesis of sLe antigens, using a panel of human PDA cells showed differences in the levels of sialylated determinants and alpha 2,3-STs expression, reflecting their phenotypic heterogeneity. Knockdown of ST3GAL3 and ST3GAL4 in BxPC-3 and Capan-1 cells, which expressed moderate to high levels of sLe antigens and alpha 2,3-STs, led to a significant reduction in sLe(x)and in most cases in sLe(a), with slight increases in the alpha 2,6-sialic acid content. Moreover, ST3GAL3 and ST3GAL4 downregulation resulted in a significant decrease in cell migration and invasion. Binding and rolling to E-selectin, which represent key steps in metastasis, were also markedly impaired in the alpha 2,3-STs knockdown cells. Our results indicate that inhibition of ST3GAL3 and ST3GAL4 may be a novel strategy to block PDA metastasis, which is one of the reasons for its dismal prognosis.
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