Binding of a human monoclonal antithyroglobulin antibody to cultured human thyroid cancer cells.
To develop a new method of radioimmunodetection for thyroid cancer, we tested the binding ability of a human antithyroglobulin monoclonal antibody, VB5, to primary culture of human thyroid cancer cells. VB5 was able to immunostain cytoplasmic thyroglobulin (Tg) in the acetone-fixed cancer cells when used in a labeled streptavidin-biotin method but not in a conventional indirect immunoperoxidase technique. The antibody was readily labeled with I-125 in the standard chloramin-T method, and showed specific binding to the antigen on cultured malignant thyrocytes displaceable with non-labeled VB5 or with excess Tg antigen. Although these initial results in vitro are encouraging, the observed low specific binding (about 1% at room temperature) to intact cells with a single monoclonal antibody seems insufficient to conduct any in vivo immunolocalization experiments in animals. To obtain more binding, we would need a cocktail of several monoclonal antibodies to different epitopes, and also fragmentation of antibody molecules to penetrate into cytoplasm.
Misaki
T
T
Department of Nuclear Medicine and Diagnostic Imaging, Kyoto University School of Medicine, Kyoto, Japan.
Alam
M S
MS
Sakahara
H
H
Kasagi
K
K
Konishi
J
J
D000911:Antibodies, Monoclonal; D006801:Humans; D007150:Immunohistochemistry; D007457:Iodine Radioisotopes; D016719:Radioimmunodetection / Q000379:methods*; D013954:Thyroglobulin / Q000276:immunology* / Q000378:metabolism; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging* / Q000378:metabolism; D014407:Tumor Cells, Cultured
D000911:Antibodies, Monoclonal; D007457:Iodine Radioisotopes; D013954:Thyroglobulin