Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 55, Issue 5, Pages 1969-1977Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jm201489a
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- Novo Nordisk
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We report in vitro and in vivo data of new alpha-melanocyte-stimulating hormone (alpha-MSH) analogues which are N-terminal modified with a long chain fatty acid derivative. While keeping the pharmacophoric motif (D-Phe-Arg-Trp) fixed, we tried to improve selectivity and physicochemical parameters like solubility and stability of these analogues by replacing amino acids further away from the motif. Receptor specific changes in binding affinity to the melanocortin receptors were observed between the acetyl derivatives and the fatty acid analogues. Furthermore, amino acids at the N-terminal of alpha-MSH (Ser-Tyr-Ser) not considered to be part of the pharmacophore were found to have an influence on the MC4/MC1 receptor selectivity. While the acetyl analogues have an in vivo effect for around 7 h, the long chain fatty acid analogues have an effect up to 48 h in an acute feeding study in male Sprague-Dawley rats after a single subcutaneous administration,
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