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Effects of the Arg-Pro and Gly-Gly-Nle Moieties on Melanocortin‑1 Receptor Binding Affinities of α‑MSH Peptides

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journal contribution
posted on 2013-10-10, 00:00 authored by Jianquan Yang, Liqin Liu, Yubin Miao
The purpose of this study was to examine the effects of the -Arg-Pro- (RP) and -Gly-Gly-Nle- (GGNle) moieties on the melanoma targeting and clearance properties of 99mTc-peptides. We synthesized four new peptides {Ac-GGNle-CCEHdFRWC-NH2, Ac-GGNle-CCEHdFRWCRP-NH2, Ac-CCEHdFRWC-NleGG-NH2, and Ac-CCEHdFRWCRP-NleGG-NH2} and determined their melanocortin-1 (MC1) receptor binding affinities in B16/F1 melanoma cells. Then we further examined the biodistribution properties of 99mTc-Ac-GGNle-CCEHdFRWCRP-NH2 and 99mTc-Ac-CCEHdFRWCRP-NleGG-NH2 in B16/F1 melanoma-bearing C57 mice. Overall, the -RP- moiety was critical for retaining low nanomolar MC1 receptor binding affinity. The deletion of the -RP- moiety dramatically reduced the receptor binding affinities of the peptides. The N-terminus was a better position than C-terminus for the -GGNle- moiety in retaining the lower renal and liver uptake. High melanoma uptake coupled with fast urinary clearance of 99mTc-Ac-GGNle-CCEHdFRWCRP-NH2 provided a new insight into the design of new α-melanocyte stimulating hormone (α-MSH) peptides.