Modifications of the pyroglutamic acid and histidine residues in thyrotropin-releasing hormone (TRH) yield analogs with selectivity for TRH receptor type 2 over type 1
作者:Navneet Kaur、Vikramdeep Monga、Xinping Lu、Marvin C. Gershengorn、Rahul Jain
DOI:10.1016/j.bmc.2006.09.045
日期:2007.1.1
Thyrotropin-releasing hormone (TRH) analogs in which the N-1(tau) or the C-2 position of the imidazole ring of the histidine residue is substituted with various alkyl groups and the l-pyroglutamic acid (pGlu) is replaced with the l-pyro-2-aminoadipic acid (pAad) or (R)- and (S)-3-oxocyclopentane-1-carboxylic acid (Ocp) were synthesized and studied as agonists for TRH receptor subtype 1 (TRH-R1) and
促甲状腺激素释放激素(TRH)类似物,其中组氨酸残基的咪唑环的N-1(tau)或C-2位置被各种烷基取代,而1-焦谷氨酸(pGlu)被取代。合成了1-pyro-2-aminoadipic acid(pAad)或(R)-和(S)-3-氧代环戊烷-1-羧酸(Ocp)并作为TRH受体亚型1(TRH-R1)和亚型的激动剂进行了研究2(TRH-R2)。我们观察到几种类似物是TRH-R2的选择性激动剂,显示出相对较少或没有TRH-R1的活化。例如,发现13系列中最具选择性的激动剂(其中pGlu被pAad取代,组氨酸残基在N-1位被异丙基取代)可有效激活TRH-R2(EC(50 )= 1.9microM),但未激活TRH-R1(效能> 100 microM);即,展示> 与TRH-R1相比,TRH-R2的选择性高51倍。类似物8(其中pGlu被pAad取代并且组氨酸在N-1(tau)位置被甲基取代)表现