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Characterizations of the unusual dissociation properties of melanotropin peptides from the melanocortin receptor, hMC1R. 1996

C Haskell-Luevano, and H Miwa, and C Dickinson, and M E Hadley, and V J Hruby, and T Yamada, and I Gantz
Department of Chemistry, University of Arizona, Tucson 85721, USA.

Variation in the degree of prolonged (residual) biological activity of the melanotropin peptides alpha-MSH (alpha-melanocyte-stimulating hormone, Ac-Ser-Tyr-Met-Glu- His-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2) and the superpotent analogues [Nle4,DPhe7]alpha-MSH (MT-I) and Ac-[Nle4,Asp5,DPhe7,Lys10]alpha-MSH(4-10-NH2 (MT-II) has stimulated considerable interest regarding this biological phenomena. We have examined the differences in their relative dissociation rates from the melanocortin receptor, hMC1R, to try and correlate peptide dissociation rates with the observations of prolonged biological activity. Interestingly, these studies revealed that alpha-MSH remained 25% bound, MT-I 65% bound, and MT-II 86% bound 6 h after the ligand had been removed from the assay medium. The relative dissociation rate of MT-II was 4 times slower than that for alpha-MSH and 2 times slower than that for MT-I, which was 2 times slower than that for alpha-MSH. These data suggest that slow dissociation kinetics (hours) may contribute to the prolonged biological activities observed for both MT-I and MT-II peptides in vitro and in vivo. The prolonged binding, biological activities, and enzymatic stability of MT-I and MT-II make them putative candidates for clinical uses such as external scintigraphy for the localization of tumors (i.e., melanoma).

UI MeSH Term Description Entries
D007739 L Cells A cultured line of C3H mouse FIBROBLASTS that do not adhere to one another and do not express CADHERINS. Earle's Strain L Cells,L Cell Line,L Cells (Cell Line),L-Cell Line,L-Cells,L-Cells, Cell Line,L929 Cell Line,L929 Cells,NCTC Clone 929 Cells,NCTC Clone 929 of Strain L Cells,Strain L Cells,Cell Line L-Cell,Cell Line L-Cells,Cell Line, L,Cell Line, L929,Cell Lines, L,Cell, L,Cell, L (Cell Line),Cell, L929,Cell, Strain L,Cells, L,Cells, L (Cell Line),Cells, L929,Cells, Strain L,L Cell,L Cell (Cell Line),L Cell Lines,L Cell, Strain,L Cells, Cell Line,L Cells, Strain,L-Cell,L-Cell Lines,L-Cell, Cell Line,L929 Cell,Strain L Cell
D008116 Lizards Reptiles within the order Squamata that generally possess limbs, moveable EYELIDS, and EXTERNAL EAR openings, although there are some species which lack one or more of these structures. Chameleons,Geckos,Chameleon,Gecko,Lizard
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009074 Melanocyte-Stimulating Hormones Peptides with the ability to stimulate pigmented cells MELANOCYTES in mammals and MELANOPHORES in lower vertebrates. By stimulating the synthesis and distribution of MELANIN in these pigmented cells, they increase coloration of skin and other tissue. MSHs, derived from pro-opiomelanocortin (POMC), are produced by MELANOTROPHS in the INTERMEDIATE LOBE OF PITUITARY; CORTICOTROPHS in the ANTERIOR LOBE OF PITUITARY, and the hypothalamic neurons in the ARCUATE NUCLEUS OF HYPOTHALAMUS. MSH,Melanocyte Stimulating Hormone,Melanocyte-Stimulating Hormone,Melanophore Stimulating Hormone,Melanotropin,MSH (Melanocyte-Stimulating Hormones),Melanophore-Stimulating Hormone,Hormone, Melanocyte Stimulating,Hormone, Melanocyte-Stimulating,Hormone, Melanophore Stimulating,Melanocyte Stimulating Hormones,Stimulating Hormone, Melanocyte,Stimulating Hormone, Melanophore
D010858 Pigmentation Coloration or discoloration of a part by a pigment. Pigmentations
D011485 Protein Binding The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments. Plasma Protein Binding Capacity,Binding, Protein
D011894 Rana pipiens A highly variable species of the family Ranidae in Canada, the United States and Central America. It is the most widely used Anuran in biomedical research. Frog, Leopard,Leopard Frog,Lithobates pipiens,Frogs, Leopard,Leopard Frogs
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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