<i>N</i>-Guanidyl and <i>C</i>-Tetrazole Leu-Enkephalin Derivatives: Efficient Mu and Delta Opioid Receptor Agonists with Improved Pharmacological Properties
作者:Jean-Louis Beaudeau、Véronique Blais、Brian J. Holleran、Alexandre Bergeron、Graciela Piñeyro、Brigitte Guérin、Louis Gendron、Yves L. Dory
DOI:10.1021/acschemneuro.8b00550
日期:2019.3.20
Leu-enkephalin and d-Ala2-Leu-enkephalin were modified at their N- and C-termini with guanidyl and tetrazole groups. The resulting molecules were prepared in solution or by solid phase peptide synthesis. The affinity of the different analogues at mu (MOP) and delta opioid receptors (DOP) was then assessed by competitive binding in stably transfected DOP and MOP HEK293 cells. Inhibition of cAMP production
Leu-脑啡肽和d -Ala 2 -Leu-脑啡肽在N和C末端被胍基和四唑基修饰。在溶液中或通过固相肽合成制备所得分子。然后通过在稳定转染的DOP和MOP HEK293细胞中的竞争性结合来评估不同类似物对mu(MOP)和δ阿片样物质受体(DOP)的亲和力。还研究了cAMP的抑制作用和β-arrestin的募集。最后,亲脂性(logD 7.4)和每种化合物的血浆稳定性。与天然配体相比,我们发现用四唑取代末端羧酸盐会稍微降低对mu和delta阿片样物质受体的亲和力以及半衰期。相反,用胍基取代N-末端的铵盐显着改善了所得肽的亲和力,效力以及亲脂性和稳定性。在位置2用d-丙氨酸取代甘氨酸残基始终提高了类似物的效价和稳定性。全系列,胍-Tyr-最好的肽d-Ala-Gly-Phe-Leu-四唑显示出亚纳摩尔亲和力和增加的亲脂性。此外,它被证明在血浆中长达24小时都是稳定的,这表明这些修饰可以保护化合物免受蛋白酶降解。