摘要:
In order to improve metabolic stability, a ring structure with a cystine moiety was introduced into TY027 (Tyr-D-Ala-Gly-Phe-Met-Pro-Leu-Trp-NH-[3',5'-(CF3)(2)Bzl]), which is a lead compound of our developing bifunctional peptide possessing opioid agonist and NK1 antagonist activities. TY038 (Tyr-cyclo[D-Cys-Gly-Phe- Met-Pro-D-Cys]-Trp-NH-[3',5'-(CF3)(2)Bzl]) was found as a highly selective d opioid agonist over l receptor in conventional tissue-based assays, together with an effective NK1 antagonist activity and good metabolic stability with more than 24 h half life in rat plasma. (c) 2009 Elsevier Ltd. All rights reserved.