Syntheses of 2-nitroimidazole derivatives conjugated with 1,4,7-triazacyclononane- N, N ′-diacetic acid labeled with F-18 using an aluminum complex method for hypoxia imaging

Lathika Hoigebazar, Jae Min Jeong, Ji Youn Lee, Dinesh Shetty, Bo Yeun Yang, Yun Sang Lee, Dong Soo Lee, June Key Chung, Myung Chul Lee

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42 Scopus citations

Abstract

Hypoxia imaging is important for diagnosis of ischemic diseases, and thus various 18F-labeled radiopharmaceuticals have been developed. However, 18F-labeling requires multistep procedures including azeotropic distillation, which is complicated and difficult to automate. Recently, 18F-labeling method using Al-F complex in aqueous solution was devised that offered a straightforward 18F-labeling procedure. We synthesized nitroimidazole derivatives conjugated with 1,4,7-triazacyclononane- 1,4-diacetic acid (NODA) that can be labeled with 18F using Al-F complex and examined their radiochemistries, in vitro and in vivo biological properties, and animal PET imaging characteristics. We found that the synthesized derivatives have excellent 18F-labeling efficiencies, high stabilities, specific uptakes in cultured hypoxic tumor cells, and high tumor to nontumor ratios in xenografted mice. Furthermore, the derivatives were labeled with 18F in a straightforward manner within 15 min at high labeling efficiencies and radiochemical purities. In conclusion, 18F-labeled NODA-nitroimidazole conjugates were developed and proved to be promising hypoxia PET agents.

Original languageBritish English
Pages (from-to)3155-3162
Number of pages8
JournalJournal of Medicinal Chemistry
Volume55
Issue number7
DOIs
StatePublished - 12 Apr 2012

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