Substituted phenylethyl amides and phenylethyl esters Va - Vj derived from the carboxyterminal tetrapeptide part of the cholecystokinin were synthesized and their biological properties assayed. In the original CCK tetrapeptide structure Trp-Met-Asp-Phe-NH2 the Met was replaced by Lys(Pamc) and the terminal Phe-NH2 was replaced by Phe-NHCH2C6H5 or Phe-OCH2C6H5 moiety with a various degree of alkylation in the Ph ring. A bioassay revealed that these simple CCK analogues were selectively bound to A receptors from pancreas, whereas no binding to B receptors from brain was found. Some of the compounds behaved as weak inhibitors of CCK activity on gall bladder and guinea pig ileum contractions without any effect in anorectic assay.
从胆囊收缩素的羧基末端四肽部分合成了取代苯乙基酰胺和苯乙基酯Va - Vj,对它们的生物学性质进行了测定。在原始的CCK四肽结构Trp-Met-Asp-Phe-NH2中,Met被Lys(Pamc)取代,末端的Phe-NH2被Phe-NHCH2C6H5或Phe-OCH2C6H5取代,苯环中的取代程度不同。生物测定显示,这些简单的CCK类似物选择性地结合到胰腺的A受体,而在大脑中没有发现与B受体的结合。其中一些化合物表现为弱的CCK活性抑制剂,对胆囊和豚鼠回肠的收缩没有影响。