Abstract:
:Positron emission tomography (PET) using fluorine-18 (18F)-labeled 2-nitroimidazole radiotracers has proven useful for assessment of tumor oxygenation. However, the passive diffusion-driven cellular uptake of currently available radiotracers results in slow kinetics and low tumor-to-background ratios. With the aim to develop a compound that is actively transported into cells, 1-(6'-deoxy-6'-[18F]fluoro-β-d-allofuranosyl)-2-nitroimidazole (β-[18F]1), a putative nucleoside transporter substrate, was synthetized by nucleophilic [18F]fluoride substitution of an acetyl protected labeling precursor with a tosylate leaving group (β-6) in a final radiochemical yield of 12±8% (n=10, based on [18F]fluoride starting activity) in a total synthesis time of 60min with a specific activity at end of synthesis of 218±58GBq/μmol (n=10). Both radiolabeling precursor β-6 and unlabeled reference compound β-1 were prepared in multistep syntheses starting from 1,2:5,6-di-O-isopropylidene-α-d-allofuranose. In vitro experiments demonstrated an interaction of β-1 with SLC29A1 and SLC28A1/2/3 nucleoside transporter as well as hypoxia specific retention of β-[18F]1 in tumor cell lines. In biodistribution studies in healthy mice β-[18F]1 showed homogenous tissue distribution and excellent metabolic stability, which was unaffected by tissue oxygenation. PET studies in tumor bearing mice showed tumor-to-muscle ratios of 2.13±0.22 (n=4) at 2h after administration of β-[18F]1. In ex vivo autoradiography experiments β-[18F]1 distribution closely matched staining with the hypoxia marker pimonidazole. In conclusion, β-[18F]1 shows potential as PET hypoxia radiotracer which merits further investigation.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Wanek T,Kreis K,Križková P,Schweifer A,Denk C,Stanek J,Mairinger S,Filip T,Sauberer M,Edelhofer P,Traxl A,Muchitsch VE,Mereiter K,Hammerschmidt F,Cass CE,Damaraju VL,Langer O,Kuntner Cdoi
10.1016/j.bmc.2016.08.053subject
Has Abstractpub_date
2016-11-01 00:00:00pages
5326-5339issue
21eissn
0968-0896issn
1464-3391pii
S0968-0896(16)30670-8journal_volume
24pub_type
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