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Synthesis and evaluation of novel radioiodinated PSMA targeting ligands for potential radiotherapy of prostate cancer.

Abstract：

:Radioligand therapy (RLT) using prostate-specific membrane antigen (PSMA) targeting ligands is an attractive option for the treatment of Prostate cancer (PCa) and its metastases. We report herein a series of radioiodinated glutamate-urea-lysine-phenylalanine derivatives as new PSMA ligands in which l-tyrosine and l-glutamic acid moieties were added to increase hydrophilicity concomitant with improvement of in vivo targeting properties. Compounds 8, 15, 19a/19b and 23a/23b were synthesized and radiolabeled with 125I by iododestannylation. All iodinated compounds displayed high binding affinities toward PSMA (IC50 = 1-13 nM). In vitro cell uptake studies demonstrated that compounds containing an l-tyrosine linker moiety (8, 15 and 19a/19b) showed higher internalization than MIP-1095 and 23a/23b, both without the l-tyrosine linker moiety. Biodistribution studies in mice bearing PC3-PIP and PC3 xenografts showed that [125I]8 and [125I]15 with higher lipophilicity exhibited higher nonspecific accumulations in the liver and intestinal tract, whereas [125I]19a/19b and [125I]23a/23b containing additional glutamic acid moieties showed higher accumulations in the kidney and implanted PC3-PIP (PSMA+) tumors. [125I]23b displayed a promising biodistribution profile with favorable tumor retention, fast clearance from the kidney, and 2-3-fold lower uptake in the liver and blood than that observed for [125I]MIP-1095. [125/131I]23b may serve as an optimal PSMA ligand for radiotherapy treatment of prostate cancer over-expressing PSMA.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Yao X,Zha Z,Ploessl K,Choi SR,Zhao R,Alexoff D,Zhu L,Kung HF

doi

10.1016/j.bmc.2020.115319

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

115319

issue

5

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(19)32006-1

journal_volume

28

pub_type

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