Synthesis, characterization and bioactivity studies of novel 1,3,4-oxadiazole small molecule that targets basic phospholipase A2 from Vipera russelli
作者:Vivek Hamse Kameshwar、Kumar J. R.、Babu S. Priya、S. Nanjunda Swamy
DOI:10.1007/s11010-016-2888-6
日期:2017.2
Secretory phospholipase A2 (sPLA2) is a key enzyme participating in the inflammatory cascade followed by the action of cyclooxygenase-2 and lipoxygenases. Therefore, inhibitors of sPLA2 could be used as potent anti-inflammatory agents to treat the early phase of inflammation. In this study, we have prepared the fenoprofen and ibuprofen analogs containing 1,3,4-oxadiazole nucleus and tested against Vipera russelli venom's basic sPLA2 (VRV-PL-VIIIa). Among the tested ligands 5(a–t),2-(2-chlorophenyl)-5-(1-(4-phenoxyphenyl) ethyl)-1,3,4-oxadiazole (5m) inhibited the catalytic activity of VRV-PL-VIIIa with an IC50 value of 11.52 µM. Biophysical studies revealed that the 5m quenches the intrinsic fluorescence of VRV-PL-VIIIa, in a concentration dependent manner. Also, the compound 5m affected VRV-PL-VIIIa conformation, which was observed by circular dichroism spectra that recorded the prominent shift in the α-helix peak and the random coil formation of VRV-PL-VIIIa. Further, molecular docking analysis revealed that the compound 5m possess strong hydrophobic interactions at catalytic triad region of the VRV-PL-VIIIa. Evident to in vitro and in silico studies, 5m strongly inhibited the hemolysis of red blood cells. Our in vivo pharmacological studies revealed that the compound 5m inhibited the edematogenic activity of VRV-PL-VIIIa in mouse foot pad. Additionally, the 5m inhibited VRV-PL-VIIIa-induced myotoxicity and lung hemorrhage in mice. Overall, our ADMET results depicted that 5m possess better druggable property. Thus, this study explored the new fenoprofen and ibuprofen analog 5m as the lead-structure that serves as an anti-inflammatory agent.
分泌型磷脂酶A2(sPLA2)是一种关键酶,参与在环氧合酶-2和脂氧合酶作用后的炎症级联反应。因此,sPLA2抑制剂可作为强效抗炎剂用于治疗炎症早期阶段。在本研究中,我们制备了含有1,3,4-噁二唑核的非诺洛芬和布洛芬类似物,并测试了其对锯鳞蝰蛇毒液的基础sPLA2(VRV-PL-VIIIa)的抑制作用。在测试的配体5(a–t)中,2-(2-氯苯基)-5-(1-(4-苯氧基苯基)乙基)-1,3,4-噁二唑(5m)对VRV-PL-VIIIa的催化活性产生抑制作用,其IC50值为11.52µM。生物物理学研究表明,5m以浓度依赖性方式淬灭VRV-PL-VIIIa的内在荧光。此外,化合物5m影响了VRV-PL-VIIIa的构象,通过圆二色光谱观察到VRV-PL-VIIIa的α-螺旋峰显著位移和随机的线圈形成。进一步的分子对接分析揭示,化合物5m在VRV-PL-VIIIa的催化三联体区域具有强烈的疏水相互作用。体外和计算机模拟研究的证据表明,5m对红细胞溶血具有强烈抑制作用。我们的体内药理学研究表明,化合物5m在鼠足垫中抑制了VRV-PL-VIIIa的肿胀活性。此外,5m抑制了VRV-PL-VIIIa引起的鼠肌肉毒性和肺出血。总体而言,我们的ADMET结果显示,5m具有更好的药物性质。因此,本研究探讨了新的非诺洛芬和布洛芬类似物5m作为抗炎剂的先导结构。