Phthalazine-1,4-dione derivatives as non-competitive AMPA receptor antagonists: design, synthesis, anticonvulsant evaluation, ADMET profile and molecular docking
作者:Abdel-Ghany A. El-Helby、Rezk R. A. Ayyad、Khaled El-Adl、Hazem Elkady
DOI:10.1007/s11030-018-9871-y
日期:2019.5
In view of the anticonvulsant activity reported for phthalazine derivatives as non-competitive AMPA receptor antagonists, a new series of phthalazine-1,4-diones (2–12) were designed and synthesized. The neurotoxicity was assessed using rotarod test. The molecular docking was performed for the synthesized compounds to assess their binding affinities toward AMPA receptor as non-competitive antagonists. The molecular modeling data were strongly interrelated to biological screening data. Compounds 8, 7b, 7a, 10 and 3a exhibited the highest binding affinities as non-competitive AMPA receptor antagonists and also showed the highest relative potencies of 1.78, 1.66, 1.60, 1.59 and 1.29, respectively, as anticonvulsants in comparison with diazepam. The most active compounds 8, 7b, 7a, 10 and 3a were further tested against maximal electroshock seizure (MES). Compounds 8 and 7b and 3a showed 100% protection at a dose level of 125 µgm/kg, while compounds 7a and 10 exhibited 83.33% protection at the same dose level. These agents exerted low neurotoxicity and high safety margin in comparison with valproate as a reference drug. Most of our designed compounds exhibited good ADMET profile.
鉴于已报道的二氮杂萘衍生物作为非竞争性 AMPA 受体拮抗剂的抗惊厥活性,设计并合成了一系列新的二氮杂萘-1,4-二酮 (2-12)。使用转棒试验评估神经毒性。对合成的化合物进行分子对接,以评估它们作为非竞争性拮抗剂与 AMPA 受体的结合亲和力。分子建模数据与生物筛选数据密切相关。与地西泮相比,化合物8、7b、7a、10和3a作为非竞争性AMPA受体拮抗剂表现出最高的结合亲和力,并且还表现出作为抗惊厥药的最高相对效力,分别为1.78、1.66、1.60、1.59和1.29。进一步测试了最具活性的化合物 8、7b、7a、10 和 3a 的最大电击癫痫发作 (MES)。化合物 8、7b 和 3a 在 125 µgm/kg 的剂量水平下表现出 100% 的保护作用,而化合物 7a 和 10 在相同剂量水平下表现出 83.33% 的保护作用。与作为参考药物的丙戊酸相比,这些药物具有较低的神经毒性和较高的安全范围。我们设计的大多数化合物都表现出良好的 ADMET 特性。