Cleavage of carcinoembryonic antigen induces metastatic potential in colorectal carcinoma.
Carcinoembryonic antigen (CEA), a widely used tumor marker, is attached by a glycosylphosphatidylinositol (GPI) anchor motif to the cell membrane. Recent study suggested that membrane-bound CEA might be cleaved by glycosylphosphatidylinositol-phospholipase D (GPI-PLD). We studied the effect of GPI-PLD on the cleavage of CEA to elucidate the implication for metastatic potential in colorectal carcinoma cells. CEA amount of conditioned medium was changed by suramin and phenanthroline (activator and inhibitor of GPI-PLD) only in SW620 and SW837 which expressed both CEA and GPI-PLD mRNA. Suramin treatment also augmented migratory activity and decreased cell surface CEA expression in SW620 and SW837. Furthermore, GPI-PLD knockdown cells using GPI-PLD-specific siRNA in SW620 and SW837 showed decreased CEA secretion from cell membrane and the migration activity, increased membrane-bound CEA amount. Splenic injection of SW620 and SW837 induced marked hepatic metastases in nude mice. These results suggest that membrane-bound CEA is cleaved by GPI-PLD and that this cleavage enhances the metastatic potential in colorectal carcinoma cells.
Yamamoto
Yasuko
Y
Department of Molecular Pathology, Graduate School of Medicine and Health Sciences, Osaka University, Japan.
Hirakawa
Eiichiro
E
Mori
Seiji
S
Hamada
Yoshinosuke
Y
Kawaguchi
Naomasa
N
Matsuura
Nariaki
N
D000818:Animals; D002272:Carcinoembryonic Antigen / Q000378:metabolism*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D015179:Colorectal Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000556:secondary; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000473:pathology* / Q000556:secondary*; D051379:Mice; D008807:Mice, Inbred BALB C; D010739:Phospholipase D / Q000378:metabolism*
D002272:Carcinoembryonic Antigen; D010739:Phospholipase D; C065017:glycoprotein phospholipase D