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Experimental Therapeutics |
(1,3)Fucosyltransferase Antisense Sequences Inhibits Selectin-mediated Adhesion and Liver Metastasis of Colon Carcinoma Cells1
The Lineberger Comprehensive Cancer Center, Department of Pediatrics, Division of Hematology/Oncology [B. W. W., K. M. H., J. P. M., G. A. M., K. M. B.], and Department of Surgery, Division of Surgical Oncology [R. L., J. C. C.], University of North Carolina, Chapel Hill, North Carolina 27599-7220
The initial steps of leukocyte and tumor cell adhesion involve selectin receptor/ligand interactions. The selectin ligand components sialyl Lewis x and sialyl Lewis a are oncodevelopmental antigens involved in progression of adenocarcinoma. Interrupting biosynthesis of these surface glycans by inhibition of
(1,3)fucosyltransferase (FUT) gene expression is an attractive goal for functional and therapeutic studies. We report here the inhibition of E-selectin-mediated adenocarcinoma cell adhesion by stable transfection of antisense sequences directed at the human Lewis
(1,3/1,4)fucosyltransferase gene, FUT3. The metastatic parental cell line, HT-29LMM, expressed high levels of sialyl Lewis x, sialyl Lewis a,
(1,3/1,4)fucosyltransferase activity, and FUT3 transcript, but antisense transfectant cell lines did not. When injected into the spleens of nude mice, the stable antisense clones were unable to colonize the liver. These results provide target validation for inhibition of carcinoma metastasis with antisense FUT sequences and confirm the primacy of
(1,3)fucosyltransferases in the synthesis of selectin ligands.
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