N-Valproyl-L-Tryptophan for CNS-Targeting: Synthesis, Characterization and Efficacy In Vitro Studies of a New Potential Antiepileptic Drug
作者:Viviana De Caro、Giulia Giandalia、Maria Gabriella Siragusa、Liliana Lamartina、Simonetta Friscia、Pierangelo Sardo、Fabio Carletti、Valerio Rizzo、Giuseppe Ferraro、Libero Italo Giannola
DOI:10.2174/157340611794072733
日期:2011.1.1
A new aminoacidic derivative of valproic acid (VPA) has been synthesized and characterized by analytical and spectral data. The rationale for the preparation of such potential antiepileptic agent is based on the observation that chemical combination of the anticonvulsant pharmacophore, VPA with essential aminoacids could afford more effective and less toxic actives. The synthesis, characterization, physico-chemical parameters functional for crossing Blood Brain Barrier of N-valproyl-L-tryptophan (4) are reported. The Log D pH7.4 (0.3) indicates that (4) is adequate to cross biological membranes. Its chemical and enzymatic stability were assessed. The experiments indicate high stability of compound (4) at pH conditions of physiological fluids. Moreover, both in plasma and in cerebral enzymatic environments compound (4) doesnt undergo cleavage after 24 h.
The anticonvulsant activity of the new compound was assessed against epileptic burst discharges evoked in vitro in rat hippocampal slices (Seizure like events - SLEs) and compared with that of the widely used VPA. Compound (4), even at the lower tested concentration, when compared to VPA, showed an improved protective effect against hippocampal seizures. The collected data suggest that compound (4) could be considered a very valuable candidate for subsequent in vivo evaluation as new potential antiepileptic drug.
我们合成了一种新的丙戊酸(VPA)氨基酸衍生物,并通过分析和光谱数据对其进行了表征。制备这种潜在抗癫痫剂的理论依据是,抗惊厥药源 VPA 与必需氨基酸的化学结合可以产生更有效、毒性更低的活性物质。本研究报告了 N-丙戊基-L-色氨酸(4)的合成、表征和穿越血脑屏障的物理化学参数。对数 D pH7.4 (0.3) 表明 (4) 足以穿过生物膜。对其化学稳定性和酶稳定性进行了评估。 实验表明,化合物 (4) 在生理液体的 pH 值条件下具有很高的稳定性。此外,在血浆和脑酶环境中,化合物 (4) 在 24 小时后都不会发生裂解。针对大鼠海马片体外诱发的癫痫爆发性放电(癫痫样事件 - SLE),对新化合物的抗惊厥活性进行了评估,并与广泛使用的 VPA 进行了比较。与 VPA 相比,即使测试浓度较低,化合物 (4) 对海马癫痫发作的保护作用也有所提高。收集到的数据表明,化合物 (4) 可被视为一种非常有价值的候选药物,可作为新的潜在抗癫痫药物进行后续体内评估。