Prostate Specific Membrane Antigen Novocastra
The prostate specific membrane antigen (PSMA) is expressed as a 750 amino acid glycoprotein but may also be found as PSM', a form of the protein missing the first 57 amino acids. PSMA has two enzymatic activities, one as a prostate-specific integral membrane folate hydrolase and the other as a carboxypeptidase. Reports suggest that PSMA expression may correlate with tumor burden and serve as an indicator of metastatic involvement. The cellular localization of PSMA contrasts with that of prostate specific antigen (PSA) and prostatic acid phosphatase (PAP) that are secreted proteins.