Synthesis and biological activity of novel small peptides with aminophosphonates moiety as NOP receptor ligands
作者:Emilia D. Naydenova、Petar T. Todorov、Polina I. Mateeva、Rositza N. Zamfirova、Nikola D. Pavlov、Simeon B. Todorov
DOI:10.1007/s00726-010-0624-1
日期:2010.11
The aim of the present study was the synthesis and the biological screening of new analogs of Ac-RYYRWK-NH(2), modified at the N-terminal with 1-[(methoxyphosphono)methylamino]cycloalkanecarboxylic acids. The four newly synthesized ligands for the nociceptin/orphanin FQ (N/OFQ) receptor (NOP) have been prepared by solid-phase peptide synthesis-Fmoc-strategy. These compounds were tested for agonistic activity in vitro on electrically stimulated smooth-muscle preparations isolated from vas deferens of Wistar rats. Our data showed that substitution of Arg at position 1 with aminophosphonates moiety decreased significantly the affinity of ligands to the NOP receptor. Furthermore, the enlargement of the cycle (with 5-8 carbon atoms) additionally diminished both the activity and the selectivity for NOP-receptor.