title: Monoclonal antibody against angiotensin-converting enzyme: its use as a marker for murine, bovine, and human endothelial cells.
abstract: A monoclonal antibody has been prepared against rat angiotensin-converting enzyme (ACE). By selection for antibody binding to endothelial cells of bovine rather than rat origin we have obtained a reagent that has broad cross-species binding properties and that can at the same time serve as a useful marker for the surface of endothelial cells. The IgM-producing clone that we have established, alpha-ACE 3.1.1, has been grown in ascites form to yield ascites fluid that binds selectively to immobilized ACE at a greater than 1:10,000 dilution. By use of enzyme-linked immunosorbent assays, immunofluorescence histology, and flow cytometry, we have demonstrated the presence of ACE on endothelial cells of murine, bovine, and human origin. By means of a fluorescence-activated cell sorter (FACS-IV) we have been able to selectively isolate viable endothelial cells from a mixture of endothelial cells and fibroblasts. We believe the antibody will be useful not only for the selection and in vitro cultivation of endothelial cells but also as a tool for the identification and pharmacological study of ACE.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D002417:Cattle; D002478:Cells, Cultured; D004727:Endothelium / Q000201:enzymology*; D006801:Humans; D051379:Mice; D007703:Peptidyl-Dipeptidase A / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D007703:Peptidyl-Dipeptidase A