Decrease of human pancreatic cancer cell tumorigenicity by alpha1,3galactosyltransferase gene transfer.
The enzyme alpha1,3galactosyltransferase synthesizes the alphaGal epitope, a carbohydrate structure (Galalpha1,3Galbeta1,4GlcNAc-R), on glycoconjugates in lower mammals. The enzyme is absent in humans but large amounts of natural antibodies that recognize alphaGal epitopes are present in human serum. It is likely that these antibodies contribute to the host defense and participate in the hyperacute rejection of xenograft. Previous studies indicated that the glycosyltransferase gene transfer into tumoral cells can modify the structure of glycoconjugates at the cell surface and, as a consequence, modulates the metastatic and tumorigenic behaviors of these cells. The aim of our study was to determine whether the expression of alphaGal epitope can modify the tumorigenicity of human pancreatic cancer cells. The expression of alphaGal epitopes in the human pancreatic cancer cell lines BxPC-3 and Panc-1 was obtained by selecting stable cell clones transfected with murine alpha1,3galactosyltransferase gene. The expression of the enzyme activity in BxPC-3 and Panc-1 cells resulted in the formation at the cell surface of alphaGal epitopes that are recognized by human anti-alphaGal antibodies. alphaGal epitope expression at the surface of pancreatic cancer cells was associated with the fixation of complement 1q to human anti-alphaGal antibodies. The alphaGal epitope expression also resulted in a delay in the tumoral development of BxPC-3 and Panc-1 cells in vivo after xenograft transplantation of nude mice. In addition to the impairment of the metastatic potential of murine tumor cell lines and the activation of immune response, our study provides evidence that the cell surface expression of alphaGal epitopes also modulates the tumorigenic behavior of human pancreatic cancer cells.
Institut National de la Santé et de la Recherche Médicale (INSERM) Unité 559 and Université de la Méditerranée EA 3289, Faculté de Médecine, 27 Boulevard Jean Moulin, 13385 Marseille Cedex 05, France.
Muriel
M
Aubert
Christian
C
Crotte
Jean-Paul
JP
Bernard
Dominique
D
Lombardo
Marie-Odile
MO
Sadoulet
Eric
E
Mas
D000818:Animals; D001483:Base Sequence; D002455:Cell Division; D017931:DNA Primers; D000939:Epitopes / Q000032:analysis; D005434:Flow Cytometry; D005697:Galactosides / Q000032:analysis; D005700:Galactosyltransferases / Q000235:genetics* / Q000378:metabolism; D018014:Gene Transfer Techniques; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D010190:Pancreatic Neoplasms / Q000201:enzymology* / Q000473:pathology*; D010957:Plasmids; D011994:Recombinant Proteins / Q000378:metabolism; D014162:Transfection; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
D017931:DNA Primers; D000939:Epitopes; D005697:Galactosides; D011994:Recombinant Proteins; D005700:Galactosyltransferases; C047006:N-acetyllactosaminide alpha-1,3-galactosyltransferase