same libraries for ligands of the delta-opioid receptor, we identified four compounds (1-4) which represent a new class of delta-opioid antagonists, some of which were also NK-1 receptor antagonists. The most potent delta-opioid antagonist, c[-Pro-1-Nal-D-Trp-Tyr-Thr-Phe-] (2), showed a K(e) value of 128 nM in the mouse vas deferens assay and a delta-receptor binding affinity constant of 152 nM in the
最近,我们报道了使用微型文库取代有效的
生长抑素激动剂L-363,301(c [-Pro-Phe-D-Trp-Lys-Thr-Phe-])的Lys(9)[
生长抑素(SRIF)编号]以产生有效的神经激肽受体(NK-1)拮抗剂c [-Pro-Phe-D-Trp-pF-Phe-Thr-Phe-]。这种新的环状六肽不结合SRIF受体。因此,单个突变转化了L-363,301,一种具有约ca.10效力的SRIF激动剂。SRIF在实验动物中效力的2-8倍(24)在体外具有选择性IC-1(50)为2 nM的选择性NK-1受体拮抗剂。在针对δ阿片受体
配体的相同文库的筛选过程中,我们鉴定了代表新一类δ阿片拮抗剂的四种化合物(1-4),其中一些也是NK-1受体拮抗剂。最有效的δ阿片类药物拮抗剂c [-Pro-1-Nal-D-Trp-Tyr-Thr-Phe-](2),在小鼠输精管试验中显示的K(e)值为128 nM