Expression of the H type 1 blood group antigen during enterocytic differentiation of Caco-2 cells.
We made a comparative study of the structures of the oligosaccharides on the glycoproteins from Caco-2 human colonic adenocarcinoma cells, before and after differentiation. Enterocytic differentiated Caco-2 cells highly express H type 1 blood group antigen on the cell surface as well as activities of brush border membrane hydrolases, such as dipeptidyl peptidase IV and alkaline phosphatase. A strong correlation was observed between the amounts of H type 1 blood group antigen and the degrees of differentiation. Structural analysis with use of lectin affinity high performance liquid chromatography revealed that typical mucin-type sugar chains of the glycoproteins from undifferentiated cells have H type 2 group, linear polylactosamines, and core 1 structure. On the other hand, differentiated cells newly contain H type 1 and Le(b) groups and core 2 structure. Mucins with H type 1 group make contact with brush border membrane enzymes on differentiated cells. Furthermore benzyl 2-acetamide-2-deoxy-alpha-D-galactopyranoside inhibited both expression of H type 1 group on the cell surface and enhancement of brush border membrane enzyme activities even in the presence of a differentiating inducer. These results suggest that the mucin-type sugar chains with H type 1 group have important functions regarding differentiation of Caco-2 cells.
Division of Biochemistry and Nutrition, Research Institute, International Medical Center of Japan, Tokyo 162-8655, Japan.
J
J
Amano
M
M
Oshima
D000017:ABO Blood-Group System / Q000096:biosynthesis* / Q000276:immunology; D018938:Caco-2 Cells; D002454:Cell Differentiation / Q000276:immunology; D005786:Gene Expression Regulation / Q000276:immunology; D006801:Humans; D007422:Intestines / Q000276:immunology* / Q000473:pathology*
D000017:ABO Blood-Group System