Synthesis and Biological Properties of New Constrained CCK-B Antagonists: Discrimination of Two Affinity States of the CCK-B Receptor on Transfected CHO Cells
作者:Bruno Bellier、Isabelle McCort-Tranchepain、Bertrand Ducos、Sophie Danascimento、Hervé Meudal、Florence Noble、Christiane Garbay、Bernard P. Roques
DOI:10.1021/jm970439a
日期:1997.11.1
compounds, of general structure N alpha-[(2-adamantyloxy)carbonyl]-alpha-methyltryptophanyl-(4 -X)-proline, were designed by introducing a cyclization in the structure of the previously described CCK-B/peptoid antagonist RB 210, N-[N-[(2-adamantyloxy)carbonyl]-DL-alpha-methyltryptophanyl] -N-(2-phenylethyl)glycine (Blommaert et al. J. Med. Chem. 1993, 36, 2868-2877), by means of a five-membered ring
为了提高我们对CCK-B拮抗剂生物活性构象的认识,我们开发了一系列新的约束二肽,其合成和生化特性已在此处报道。这些化合物的一般结构为Nα-[(2-金刚烷氧基)羰基]-α-甲基色氨酸-(4-X)-脯氨酸,是通过在先前描述的CCK-B /类肽拮抗剂RB的结构中引入环化来设计的210,N- [N-[(2-金刚烷氧基)羰基]-DL-α-甲基色氨酸] -N-(2-苯乙基)甘氨酸(Blommaert et al.J.Med.Chem.1993,36,2868-2877) ,通过五元环。结构亲和关系研究表明,Trp-C alpha的R构型和吡咯烷取代基的顺式构型有利于受体识别。该新系列中最有效的化合物对CCK-B受体的亲和力与RB 210相似,并且被证明在稳定转染大鼠脑CCK-B受体的CHO细胞中抑制肌醇磷酸生成的效率更高,IC50值接近那些常用的拮抗剂L-365,260和PD-134,308。此外,使