title: Effects of the Arg-Pro and Gly-Gly-Nle Moieties on Melanocortin-1 Receptor Binding Affinities of α-MSH Peptides.
abstract: 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 of99mTc-peptides. We synthesized four new peptides {Ac-GGNle-CCEHdFRWC-NH2, Ac-GGNle-CCEHdFRWCRP-NH2, Ac-CCEHdFRWC-NleGG-NH2and 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 of99mTc-Ac-GGNle-CCEHdFRWCRP-NH2and99mTc-Ac-CCEHdFRWCRP-NleGG-NH2in B16/F1 melanoma-bearing C57 mice. Overall, the Arg-Pro motif 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 of99mTc-Ac-GGNle-CCEHdFRWCRP-NH2provided a new insight into the design of new α-melanocyte stimulating hormone (α-MSH) peptides.
authors.affiliation: College of Pharmacy, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Jianquan
authors.initials: J
authors.lastname: Yang
authors.affiliation: College of Pharmacy, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Liqin
authors.initials: L
authors.lastname: Liu
authors.affiliation: College of Pharmacy, University of New Mexico, Albuquerque, NM 87131, USA ; Cancer Research and Treatment Center, University of New Mexico, Albuquerque, NM 87131, USA ; Department of Dermatology, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Yubin
authors.initials: Y
authors.lastname: Miao
keywords: 99mTc-labeled; alpha-MSH peptide; melanocortin-1 receptor; melanoma