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A modular platform for the rapid site-specific radiolabeling of proteins with 18F exemplified by quantitative positron emission tomography of human epidermal growth factor receptor 2. | LitMetric
Receptor-specific proteins produced by genetic engineering are attractive as PET imaging agents, but labeling with conventional (18)F-based prosthetic groups is problematic due to long synthesis times, poor radiochemical yields, and low specific activities. Therefore, we developed a modular platform for the rapid preparation of water-soluble prosthetic groups capable of efficiently introducing (18)F into proteins. The utility of this platform is demonstrated by the thiol-specific prosthetic group, [(18)F]FPEGMA, which was used to produce site-specifically (18)F-labeled protein ((18)F-trastuzumab-ThioFab) in 82 min with a total radiochemical yield of 13 +/- 3% and a specific activity of 2.2 +/- 0.2 Ci/micromol. (18)F-trastuzumab-ThioFab retained the biological activity of native protein and was successfully validated in vivo with microPET imaging of Her2 expression in a xenograft tumor-bearing murine model modulated by the Hsp90 inhibitor, 17-(allylamino)-17-demethoxygeldanamycin.
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