Peptide Mimetics of Thyrotropin-Releasing Hormone Based on a Cyclohexane Framework: Design, Synthesis, and Cognition-Enhancing Properties
作者:Gary L. Olson、Ho-Chuen Cheung、Elliot Chiang、Vincent S. Madison、Jerry Sepinwall、George P. Vincent、Andrew Winokur、Keith A. Gary
DOI:10.1021/jm00015a009
日期:1995.7
The design and synthesis of peptide mimetics of thyrotropin-releasing hormone (TRH) in which the peptide backbone is entirely replaced by a cyclohexane framework are described. The cis-1,3,5-trisubstituted ring was expected to permit key pharmacophoric groups to adopt conformations consistent with proposed bioactive conformations of the peptide. Compounds were synthesized by a stereoselective synthesis
描述了促甲状腺激素释放激素(TRH)的肽模拟物的设计和合成,其中肽主链完全被环己烷骨架取代。预期顺式1,3,5-三取代环可允许关键的药效基团采用与肽的拟议生物活性构象一致的构象。通过立体选择性合成从L-谷氨酸开始合成化合物。在TRH有活性的认知行为模型中,模拟物是有效的活性化合物,表现出口服活性。一种类似物(26,(1S,3R,5(2S),5S)-5-[[5-氧代-1-(苯基甲基)-2-吡咯烷基]-甲基] -5-[(1H-咪唑-5-放射标记用于结合研究,并在其他结合试验和药理试验中进行评估。26 vs [3H] MeTRH与大鼠脑切片的竞争结合表明配体结合的两个位点模型具有1 microM和3 mM的IC50。[3H] -26的直接结合显示出双相曲线,IC50分别为80和49 microM。需要进一步的研究来建立新型结合位点与26和TRH类似物的行为活性之间的联系。