Development of new prostate specific monoclonal antibodies.

BACKGROUND: Despite the need for new prostate-specific diagnostic and therapeutic targets, very few unique prostate (cancer) specific antigens have been characterized. Monoclonal antibody (mAb) technology is a powerful tool to identify specific antigenic markers, which could be potential targets for cancer diagnostics or therapy. METHODS: Splenocytes from mice immunized with prostate cancer (PCa) homogenates of different origin were fused using standard techniques. Employing a differential high-throughput screening method followed by immediate screening in immunohistochemistry (IHC) a large number of hybridomas were screened for prostate (cancer) specificity. RESULTS: From 25 successful fusions approximately 300 clones were identified excreting PCa-reactive antibodies. Subsequent immunohistochemical fine-specificity analysis reduced this number to 26. Eventually, after extensive fine-specificity analysis, the number of mAbs appearing to define prostate-specific antigenic structures that might serve as new diagnostic or therapeutic targets was reduced to three. CONCLUSIONS: Using mAb technology combined with a high throughput screening method we have developed three mAbs (1.8, 2.26, and 3.10) directed against prostate associated antigens that might identify potential new therapeutic targets