The Influence of the 1-(3-Trifluoromethyl-Benzyl)-1H-Pyrazole-4-yl Moiety on the Adenosine Receptors Affinity Profile of Pyrazolo[4,3-e][1,2,4]Triazolo[1,5-c]Pyrimidine Derivatives
作者:Stephanie Federico、Sara Redenti、Mattia Sturlese、Antonella Ciancetta、Sonja Kachler、Karl-Norbert Klotz、Barbara Cacciari、Stefano Moro、Giampiero Spalluto
DOI:10.1371/journal.pone.0143504
日期:——
A new series of pyrazolo[4,3-e][1,2,4]triazolo[1,5-c]pyrimidine (PTP) derivatives has been developed in order to explore their affinity and selectivity profile at the four adenosine receptor subtypes. In particular, the PTP scaffold was conjugated at the C2 position with the 1-(3-trifluoromethyl-benzyl)-1H-pyrazole, a group believed to confer potency and selectivity toward the human (h) A2B adenosine receptor (AR) to the xanthine ligand 8-(1-(3-(trifluoromethyl)benzyl)-1H-pyrazol-4-yl)-1,3-dimethyl-1H-purine-2,6(3H,7H)-dione (CVT 6975). Interestingly, the synthesized compounds turned out to be inactive at the hA2B AR but they displayed affinity at the hA3 AR in the nanomolar range. The best compound of the series (6) shows both high affinity (hA3 AR Ki = 11 nM) and selectivity (A1/A3 and A2A/A3 > 9090; A2B/A3 > 909) at the hA3 AR. To better rationalize these results, a molecular docking study on the four AR subtypes was performed for all the synthesized compounds. In addition, CTV 6975 and two close analogues have been subjected to the same molecular docking protocol to investigate the role of the 1-(3-trifluoromethyl-benzyl)-1H-pyrazole on the binding at the four ARs.
为了探索在四种腺苷受体亚型上的亲和力和选择性谱,我们开发了一系列新的吡唑并[4,3-e][1,2,4]三唑并[1,5-c]嘧啶(PTP)衍生物。特别地,PTP骨架在C2位置与1-(3-三氟甲基苯基)-1H-吡唑结合,这一基团被认为赋予其对人类(h)A2B腺苷受体(AR)相对于黄嘌呤配体8-(1-(3-(三氟甲基)苯基)-1H-吡唑-4-基)-1,3-二甲基-1H-嘌呤-2,6(3H,7H)-二酮(CVT 6975)的效能和选择性。有趣的是,合成的化合物在hA2B AR上显示为无活性,但它们在hA3 AR上的亲和力却在纳摩尔范围内。该系列中表现最好的化合物(6)在hA3 AR上显示出高亲和力(hA3 AR Ki = 11 nM)和选择性(A1/A3和A2A/A3 > 9090;A2B/A3 > 909)。为了更好地解释这些结果,我们对所有合成化合物在四种AR亚型上进行了分子对接研究。此外,CTV 6975及其两个密切相关的类似物也进行了相同的分子对接协议,以调查1-(3-三氟甲基苯基)-1H-吡唑在四种AR之间结合的作用。