Morphiceptin (Tyr-Pro-Phe-Pro-NH2) is a selective ligand of the mu opioid receptor, an important target in pain regulation. In this study, morphiceptin was modified at positions 2 or 3 by introduction of Î²2- or Î²3-amino acids and additionally in position 1 by replacing Tyr by Dmt (2â²,6â²-dimethyltyrosine), which resulted in obtaining enzymatically stable analogs with mixed opioid receptor affinity profiles. An analog of the sequence Dmt-D-Ala-(R)-Î²2-1-Nal-Pro-NH2 [NalÂ =Â 3-(1-naphthyl)-alanine] showed very high activity at the mu and delta receptors in the calcium mobilization functional test but did not cross the artificial membrane imitating the blood-brain barrier. In the in vivo test this analog induced strong antinociceptive effect in the writhing test in mice after intraperitioneal but also oral administration and inhibited diarrhea similarly to loperamide. Therefore, it may become an interesting lead compound in the development of peripherally restricted drugs for the treatment of gastrointestinal disorders.
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|Titolo:||Synthesis and activity of opioid peptidomimetics with Î²2- and Î²3-amino acids|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||03.1 Articolo su rivista|