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- W2017757891 abstract "The purpose of this study was to examine the melanoma targeting and pharmacokinetic properties of 67Ga-DOTA-GGNle-CycMSHhex {67Ga-1,4,7,10-tetraazacyclononane-1,4,7,10-tetraacetic acid-Gly-Gly-Nle-c[Asp-His-DPhe-Arg-Trp-Lys]-CONH2} and 67Ga-NOTA-GGNle-CycMSHhex {67Ga-1,4,7-triazacyclononane-1,4,7-triacetic acid-Gly-Gly-Nle-c[Asp-His-DPhe-Arg-Trp-Lys]-CONH2} and compare with 67Ga-DOTA-GlyGlu-CycMSH {67Ga-DOTA-Gly-Glu-c[Lys-Nle-Glu-His-DPhe-Arg-Trp-Gly-Arg-Pro-Val-Asp]} we previously reported. DOTA-GGNle-CycMSHhex and NOTA-GGNle-CycMSHhex were synthesized using fluorenylmethyloxy carbonyl (Fmoc) chemistry. The melanocortin-1 (MC1) receptor binding affinity of NOTA-GGNle-CycMSHhex was determined in B16/F1 melanoma cells and compared with DOTA-GGNle-CycMSHhex. The melanoma targeting and pharmacokinetic properties of 67Ga-NOTA-GGNle-CycMSHhex and 67Ga-DOTA-GGNle-CycMSHhex were determined in B16/F1 melanoma-bearing C57 mice. NOTA-GGNle-CycMSHhex and DOTA-GGNle-CycMSHhex displayed comparable MC1 receptor binding affinities (1.6 vs 2.1 nM) in B16/F1 melanoma cells. Both 67Ga-NOTA-GGNle-CycMSHhex and 67Ga-DOTA-GGNle-CycMSHhex exhibited dramatically enhanced melanoma uptake and reduced renal uptake than 67Ga-DOTA-GlyGlu-CycMSH in B16/F1 melanoma-bearing C57 mice. Furthermore, 67Ga-NOTA-GGNle-CycMSHhex exhibited more favorable radiolabeling conditions (>85% radiolabeling yields started at 37 °C), as well as higher tumor/kidney uptake ratios than 67Ga-DOTA-GGNle-CycMSHhex at 0.5, 2, and 24 h postinjection. High melanoma uptake coupled with low renal uptake highlighted the potential of 67Ga-NOTA-GGNle-CycMSHhex for melanoma imaging and therapy." @default.
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- W2017757891 date "2012-06-05" @default.
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- W2017757891 title "Gallium-67-Labeled Lactam Bridge-Cyclized Alpha-MSH Peptides with Enhanced Melanoma Uptake and Reduced Renal Uptake" @default.
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- W2017757891 doi "https://doi.org/10.1021/bc300191z" @default.
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