Structure–activity relationships of the tetrapeptide Ac-His-Arg-(Pi)Dphe-TiC-NH2 at the mouse melanocortin receptors

Modification at the (PI)DPhe position leads to MMC3R versus MMC4R selective ligands

Katherine N. Schlasner, Mark D Ericson, Skye R Doering, Katie T. Freeman, Mary Weinrich, Carrie Haskell-Luevano

Research output: Contribution to journalArticle

Abstract

The five melanocortin receptors (MC1R–MC5R) are involved in numerous biological pathways, including steroidogenesis, pigmentation, and food intake. In particular, MC3R and MC4R knockout mice suggest that the MC3R and MC4R regulate energy homeostasis in a non-redundant manner. While MC4R-selective agonists have been utilized as appetite modulating agents, the lack of MC3R-selective agonists has impeded progress in modulating this receptor in vivo. In this study, the (pI)DPhe position of the tetrapeptide Ac-His-Arg-(pI)DPhe-Tic-NH2 (an MC3R agonist/MC4R antagonist ligand) was investigated with a library of 12 compounds. The compounds in this library were found to have higher agonist efficacy and potency at the mouse (m) MC3R compared to the MC4R, indicating that the Arg-DPhe motif preferentially activates the mMC3R over the mMC4R. This observation may be used in the design of new MC3R-selective ligands, leading to novel probe and therapeutic lead compounds that will be useful for treating metabolic disorders.

Original languageEnglish (US)
Article number1463
JournalMolecules
Volume24
Issue number8
DOIs
StatePublished - Apr 13 2019

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Melanocortin Receptors
mice
food intake
knockout mice
Ligands
Lead compounds
lead compounds
homeostasis
Tics
ligands
Pigmentation
Appetite
Knockout Mice
Libraries
Homeostasis
Eating
disorders
probes
energy
Therapeutics

Keywords

  • MC3R
  • MC4R
  • Melanocortins
  • Mixed pharmacology
  • Tetrapeptides

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Structure–activity relationships of the tetrapeptide Ac-His-Arg-(Pi)Dphe-TiC-NH2 at the mouse melanocortin receptors : Modification at the (PI)DPhe position leads to MMC3R versus MMC4R selective ligands. / Schlasner, Katherine N.; Ericson, Mark D; Doering, Skye R; Freeman, Katie T.; Weinrich, Mary; Haskell-Luevano, Carrie.

In: Molecules, Vol. 24, No. 8, 1463, 13.04.2019.

Research output: Contribution to journalArticle

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