Development and Properties of a Monoclonal Antibody Specific for Human Ecto-5'-Nucleotidase

• Published in: Immunobiology (1979) 1984-03, Vol.166 (2), p.203-211
• Main Authors: Kummer, U., Mysliwietz, J., Gutensohn, W., Buschette, S., Jahn, H., Neuser, D., Munker, R.
• Format: Article
• Language: English
• Subjects: 5'-Nucleotidase; Animals; Antibodies, immunoglobulins; Antibodies, Monoclonal - immunology; Antibody Specificity; Binding Sites; Biological and medical sciences; Cross Reactions; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Humans; Hybridomas - immunology; Leukemia, Lymphoid - enzymology; Lymphocytes - enzymology; Mice; Molecular immunology; Nucleotidases - immunology
• ISSN: 0171-2985; 1878-3279
• DOI: 10.1016/S0171-2985(84)80038-8

After immunization with purified human placental ecto-5'-nucleotidase and fusion, 18 different hybrids were obtained which produce an antibody inhibitory for enzyme activity. These antibodies show complete cross-reactivity with the enzyme in a membrane-bound form or on the surface of intact cells. After cloning and ascites production, the antibody of one clone (IFH-5N1) was studied in greater detail. The IFH-5N1 antibody is of the IgG 1 subclass. Optimal enzyme inhibition is 90% for purified 5'-nucleotidase and 80% for the enzyme on lymphoblasts. The specificity of this antibody is further demonstrated by enzyme inhibition assays and fluorescence labeling using various 5'-nucleotidase-positive and -negative human cells such as peripheral blood lymphocytes, leukemic cells, lymphoblastoid B- and T-cell-lines and fibroblasts. The antibody should provide a useful tool for the diagnosis of certain forms of acute leukemias and for the study of normal human lymphocyte subpopulations.