Study of a radiopharmaceutical precursor targeting prostate-specific membrane antigen

Prostate cancer is one of the most commonly diagnosed cancers worldwide. Targeted therapy is an anticancer strategy using short peptides targeting prostate-specific membrane antigen (PSMA). However, short peptides have a number of disadvantages, including low stability in vivo. This problem can be solved by using toxins with an inhibitory cystine knot with a short built in peptide. The aim of the study is to examine the stability and ability of the PSMA/C1-C2 peptide, created on the base of knottin U5-scytotoxin-Sth1a and a short peptide tropic to PSMA, to bind to receptors on the surface of prostate cancer cells and to compare the results with a market image drug PSMA I&T and a specific PSMA inhibitor.