title: A monoclonal antibody to intestinal alkaline phosphatase made against D98/AH-2 (HeLa) cells.
abstract: A monoclonal antibody (AAP1) to human intestinal alkaline phosphatase (ALP) was produced by immunizing a mouse with D98/AH-2 (HeLa) cells, which produce the enzyme ectopically. The antibody, which did not inhibit enzyme activity using p-nitrophenyl phosphate as the substrate, was of the IgG2A class and did not show complement-dependent cytotoxicity. In trace binding assays AAP1 bound only to cells that expressed an intestinal-like form of human ALP, including some human intraspecific (D98/AG-2 x human lymphocyte or fibroblast) hybrids. Immunoprecipitation of immune complexes from cell-free extracts of D98/AG-2 cells, using protein A containing S. aureus and AAP1 antibody, resulted in precipitation of all the ALP activity. The precipitated material had a subunit molecular weight of 80,000 daltons, as estimated by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate. In non-denaturing conditions, AAP1 antibody prevented the migration of ALP activity into the gel when cell-free extracts were made from human adult or fetal intestine, or D98/AH-2 cells. Similarly, AAP1 could be used to precipitate ALP activity from these extracts but not from extracts of human liver, kidney or placenta.
mesh_terms: D000469:Alkaline Phosphatase / Q000276:immunology*; D000818:Animals; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D001666:Binding Sites, Antibody; D002459:Cell Fusion; D002460:Cell Line; D011232:Chemical Precipitation; D005260:Female; D005333:Fetus / Q000276:immunology; D006367:HeLa Cells / Q000276:immunology; D006801:Humans; D007422:Intestines / Q000201:enzymology* / Q000276:immunology; D007668:Kidney / Q000276:immunology; D008099:Liver / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D008970:Molecular Weight; D010920:Placenta / Q000276:immunology; D011247:Pregnancy
chemical_list: D000911:Antibodies, Monoclonal; D000469:Alkaline Phosphatase