Human bladder cancer cell-surface antigens recognized by murine monoclonal antibodies raised against T24 bladder cancer cells.

Seven hybridoma clones producing monoclonal antibodies (HBJ8, HBJ27, HBJ67, HBJ71, HBJ98, HBJ104 and HBJ127) were selected from hybridomas prepared by fusion between P3 X Ag8.653 mouse myeloma cells and spleen cells of a BALB/c mouse immunized with T24 human urinary bladder cancer cells, and the binding specificity of, and the molecular characters of the antigens defined by, these monoclonal antibodies were examined. The cell-surface antigens detected with these monoclonal antibodies from T24 bladder cancer cells were as follows: 1) HBJ27-defined gp85 antigen common in all human cells or tissues tested, 2) HBJ98- or HBJ127-defined gp125 antigen distributed in all epithelial and non-epithelial human tumor cell lines tested and in basal layers of the skin or esophagus, proximal tubules of the kidney, and crypts of the gastric and intestinal mucosa, 3) HBJ8-defined gp(40/90) and HBJ67-defined gp83 antigens distributed in a characteristic portion of epithelial tumor cell lines, 4) HBJ71-defined antigen of protein nature and HBJ104-defined antigen of unknown character, both being detected from immunizing T24 cells and a few epithelial tumor cell lines. All these monoclonal antibodies could bind with certain portions of fresh bladder cancer tissues from patients.