Synthesis and Biological Activities of 4-Phenyl-5-pyridyl-1,3-thiazole Derivatives as Selective Adenosine A3 Antagonists
作者:Seiji Miwatashi、Yasuyoshi Arikawa、Tatsumi Matsumoto、Keiko Uga、Naoyuki Kanzaki、Yumi N. Imai、Shigenori Ohkawa
DOI:10.1248/cpb.56.1126
日期:——
To investigate the potency of an adenosine A3 receptor (A3AR) antagonist as an anti-asthmatic drug, a novel series of 4-phenyl-5-pyridyl-1,3-thiazole derivatives was synthesized and evaluated in human adenosine A1, A2A and A3 receptor and rat adenosine A3 receptor binding assays. From investigation of the SAR study, compound 7af was identified as a highly potent human and rat A3AR antagonist. This compound inhibited IB-MECA-induced plasma protein extravasation in the skin of rats and showed good oral absorption. Also, compound 7af significantly inhibited antigen-induced hyper-responsiveness to acetylcholine in actively sensitized Brown Norway rats. These results show that 4-phenyl-5-pyridyl-1,3-thiazole derivatives are potential candidates to enable the evaluation of A3AR antagonists. Further evaluation of this class of compounds may afford a novel anti-inflammatory agent such as an anti-asthmatic drug.
为了研究腺苷A3受体(A3AR)拮抗剂作为抗哮喘药物的效力,合成了一系列新的4-苯基-5-吡啶基-1,3-噻唑衍生物,并在人体腺苷A1、A2A和A3受体以及大鼠腺苷A3受体的结合实验中进行了评估。通过SAR研究的调查,化合物7af被鉴定为一种对人类和大鼠A3AR高度有效的拮抗剂。该化合物抑制了IB-MECA诱导的大鼠皮肤内血浆蛋白渗出,并显示出良好的口服吸收。此外,化合物7af显著抑制了在活跃致敏的布朗挪威大鼠中抗原诱导的对乙酰胆碱的超反应性。这些结果表明,4-苯基-5-吡啶基-1,3-噻唑衍生物是评估A3AR拮抗剂的潜在候选化合物。进一步评估这类化合物可能提供一种新的抗炎剂,如抗哮喘药物。