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Knockdown of fucosyltransferase III disrupts the adhesion of circulating cancer cells to E-selectin without affecting hematopoietic cell adhesion.

Abstract
Adhesive interactions between selectins and their ligands play an essential role during cancer extravasation. Fucosylation of these proteins by fucosyltransferases, or FUTs, is critical for their functions. Using quantitative RT-PCR, we demonstrated that FUT4 and FUT7 are the predominant FUTs expressed in hematopoietic cell line, while FUT3 is heavily expressed by multiple cancer cell lines including the prostate cancer cell line MDA PCa2b. Knockdown of FUT3 expression in MDA PCa2b cells by small interference RNA (siRNA) significantly reduced FUT3 expression. Cell-surface sialyl Lewis antigens were largely abolished. Cell adhesion and cell rolling on the blood vessel wall were simulated by perfusing cancer cells through microtubes coated with recombinant human E-selectin. At physiological levels of wall shear stress, the number of flowing cancer cells recruited to the microtube surface was dramatically reduced by FUT3 knockdown. Higher rolling velocity was also observed, which is consistent with reduced E-selectin binding activity. Interestingly, FUT3 siRNA treatment also significantly reduced the cell growth rate. Combined with the novel siRNA delivery platform recently developed in our laboratory, FUT3 siRNA could be a promising conjunctive therapy aiming at reducing the metastatic virulence of circulating epithelial cancer cells.
AuthorsXiaoyan Yin, Kuldeepsinh Rana, Varun Ponmudi, Michael R King
JournalCarbohydrate research (Carbohydr Res) Vol. 345 Issue 16 Pg. 2334-42 (Nov 02 2010) ISSN: 1873-426X [Electronic] Netherlands
PMID20833389 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
CopyrightCopyright © 2010 Elsevier Ltd. All rights reserved.
Chemical References
  • E-Selectin
  • Ligands
  • RNA, Small Interfering
  • Fucosyltransferases
  • 3-galactosyl-N-acetylglucosaminide 4-alpha-L-fucosyltransferase
Topics
  • Cell Adhesion (drug effects)
  • Cell Proliferation (drug effects)
  • E-Selectin (metabolism)
  • Fucosyltransferases (biosynthesis, deficiency, genetics)
  • Gene Knockdown Techniques
  • Hematopoietic Stem Cells (cytology)
  • Humans
  • Ligands
  • Neoplasms (enzymology, pathology)
  • RNA, Small Interfering (genetics)
  • Reverse Transcriptase Polymerase Chain Reaction
  • Structure-Activity Relationship
  • Tumor Cells, Cultured

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