生物活性方面,BFCAs-1 是一种双功能螯合剂,常用于医学影像和生物化学研究。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
1,4,7,10-四氮杂环十二烷-1,4,7,10-四乙酸,三(1,1-二甲基乙基)苯基甲基酯 | tri-tert-butyl 2,2',2''-(10-(2-(benzyloxy)-2-oxoethyl)-1,4,7,10 tetraazacyclododecane-1,4,7-triyl)triacetate | 192635-89-5 | C35H58N4O8 | 662.868 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-(9-amino-3-aza-2-oxononyl)-4,7,10-tris(tert-butyloxycarbonylmethyl)-1,4,7,10-tetraazacyclododecane | 866831-91-6 | C34H66N6O7 | 670.934 |
1,4,7,10-四氮杂环十二烷-1,4,7,10-四乙酸 | 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid | 60239-18-1 | C16H28N4O8 | 404.42 |
Targeting of cholecystokinin-2 receptor (CCK2R) expressing tumors using radiolabeled minigastrin (MG) analogs is hampered by rapid digestion of the linear peptide in vivo. In this study, a new MG analog stabilized against enzymatic degradation was investigated in preclinical studies to characterize the metabolites formed in vivo. The new MG analog DOTA-DGlu-Pro-Tyr-Gly-Trp-(N-Me)Nle-Asp-1Nal-NH2 comprising site-specific amino acid substitutions in position 2, 6 and 8 and different possible metabolites thereof were synthesized. The receptor interaction of the peptide and selected metabolites was evaluated in a CCK2R-expressing cell line. The enzymatic stability of the 177Lu-labeled peptide analog was evaluated in vitro in different media as well as in BALB/c mice up to 1 h after injection and the metabolites were identified based on radio-HPLC analysis. The new radiopeptide showed a highly increased stability in vivo with >56% intact radiopeptide in the blood of BALB/c mice 1 h after injection. High CCK2R affinity and cell uptake was confirmed only for the intact peptide, whereas enzymatic cleavage within the receptor specific C-terminal amino acid sequence resulted in complete loss of affinity and cell uptake. A favorable biodistribution profile was observed in BALB/c mice with low background activity, preferential renal excretion and prolonged uptake in CCK2R-expressing tissues. The novel stabilized MG analog shows high potential for diagnostic and therapeutic use. The radiometabolites characterized give new insights into the enzymatic degradation in vivo.