Prostate-Specific Membrane Antigen (PSMA) is an established biomarker for the imaging and experimental therapy of prostate cancer (PCa), as it is strongly upregulated in high-grade primary, androgen-independent, and metastatic lesions. Here, we report on the development and functional characterization of recombinant single-chain Fv (scFv) and Fab fragments derived from the 5D3 PSMA-specific monoclonal antibody (mAb). These fragments were engineered, heterologously expressed in insect S2 cells, and purified to homogeneity with yields up to 20 mg/L. In vitro assays including ELISA, immunofluorescence and flow cytometry, revealed that the fragments retain the nanomolar affinity and single target specificity of the parent 5D3 antibody. Importantly, using a murine xenograft model of PCa, we verified the suitability of fluorescently labeled fragments for in vivo imaging of PSMA-positive tumors and compared their pharmacokinetics and tissue distribution to the parent mAb. Collectively, our data provide an experimental basis for the further development of 5D3 recombinant fragments for future clinical use.
- MeSH
- antigeny povrchové imunologie MeSH
- buněčné linie MeSH
- buňky PC-3 MeSH
- fluorescence MeSH
- glutamátkarboxypeptidasa II imunologie MeSH
- hmyz MeSH
- jednořetězcové protilátky imunologie MeSH
- lidé MeSH
- monoklonální protilátky imunologie MeSH
- myši nahé MeSH
- myši MeSH
- nádorové buněčné linie MeSH
- nádory prostaty imunologie MeSH
- rekombinantní proteiny imunologie MeSH
- xenogenní modely - testy antitumorózní aktivity metody MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
