Synthesis and biological evaluation of [18F]bicalutamide, 4-[76Br]bromobicalutamide, and 4-[76Br]bromo- thiobicalutamide as non-steroidal androgens for prostate cancer imaging

Ephraim E. Parent, Carmen S. Dence, Carl Jenks, Terry L. Sharp, Michael J. Welch, John A. Katzenellenbogen

Research output: Contribution to journalArticlepeer-review

Abstract

Androgen receptors (AR) are overexpressed in most primary and metastatic prostate cancers. To develop a nonsteroidal AR-mediated imaging agent, we synthesized and radiolabeled several analogs of the potent antiandrogen bicalutamide: [18F]bicalutamide, 4-[76Br] bromobicalutamide, and [76Br]bromo-thiobicalutamide. Two of these analogs, 4-[76Br]bromobicalutamide and [76Br]bromo- thiobicalutamide, were found to have a substantially increased affinity for the androgen receptor (AR) compared to that of bicalutamide. The synthesis of [ 18F]bicalutamide utilized a pseudocarrier approach to effect addition of a carbanion generated from tracer-level amounts of a radiolabeled precursor to an unlabeled carbonyl precursor. 4-[76Br]Bromobicalutamide and [76Br]bromo-thiobicalutamide were labeled through electrophilic bromination of a tributylstannane precursor. The former could be prepared in high specific activity, and its tissue distribution was tested in vivo. Androgen target tissue uptake was evident in castrated adult male rats; however, in DES-treated, AR-positive, tumor-bearing male mice, tumor uptake was low.

Original languageEnglish (US)
Pages (from-to)1028-1040
Number of pages13
JournalJournal of Medicinal Chemistry
Volume50
Issue number5
DOIs
StatePublished - Mar 8 2007

ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery

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