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Amaryllidaceae alkaloids from Hippeastrum X Hybridum CV. Ferrari, and preparation of vittatine derivatives as potential ligands for Alzheimer´s disease
South African Journal of Botany ( IF 2.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.sajb.2020.06.024
L. Al Shammari , D. Hulcová , J. Maříková , T. Kučera , M. Šafratová , L. Nováková , M. Schmidt , L. Pulkrábková , J. Janoušek , O. Soukup , J. Kuneš , L. Opletal , L. Cahlíková

Abstract Fourteen (1–14) known Amaryllidaceae alkaloids, of various structural types, have been isolated from fresh bulbs of Hippeastrum X hybridum cv. Ferrari. The chemical structures were identified by various spectroscopic (1D and 2D NMR) and mass spectrometric (GC–MS, LC-MS) methods, and by comparison with literature data. Isolated alkaloids which, up to this date have not been studied for their inhibition potency against AChE, BuChE and POP, were screened in vitro for these inhibition activities. Unfortunatelly, all natural alkaloids were inactive in the AChE/BuChE assay; only zephyranthine (14) displayed moderate inhibition activity agains POP with an IC50 value of 142 ± 10 µM. Moreover, twelve new derivatives of the haemanthamine-type alkaloid vittatine (7), isolated in gram amounts from Hippeastrum cv. Ferrari, have been designed, synthesized and tested in vitro with particular emphasis on the treatment of neurodegenerative diseases. Some of the tested compounds revealed an intriguing selective hBuChE inhibitory profile with single-digit micromolar IC50 values. The strongest hBuChE inhibition was demonstrated by 3-O-(2-methylbenzoyl)vittatine (7b), 3-O-(2-nitrobenzoyl)vittatine (7h) and 3-O-(2-chlorbenzoyl)vittatine (7m) with IC50 values 8.0 ± 0.1 µM, 1.4 ± 0.1 µM and 5.4 ± 0.1 µM, respectively. The mode of hBuChE inhibition was minutely inspected using enzyme kinetic analysis in tandem with in silico experiments, the latter elucidating crucial interaction in 7b-, 7h-, and 7m-hBuChE complexes.

中文翻译:

来自 Hippeastrum X Hybridum CV 的石蒜科生物碱。法拉利,以及作为阿尔茨海默病潜在配体的维他汀衍生物的制备

摘要 十四 (1-14) 种已知的石蒜科生物碱,具有不同的结构类型,已从 Hippeastrum X hybridum cv. 的新鲜鳞茎中分离出来。法拉利。通过各种光谱(1D和2D NMR)和质谱(GC-MS,LC-MS)方法并通过与文献数据进行比较来鉴定化学结构。迄今为止还没有研究过分离的生物碱对 AChE、BuChE 和 POP 的抑制效力,在体外筛选了这些抑制活性。不幸的是,所有天然生物碱在 AChE/BuChE 检测中均无活性;只有 zephyranthine (14) 对 POP 表现出中等抑制活性,IC50 值为 142 ± 10 µM。此外,从 Hippeastrum cv. 中分离出的 12 种新的血红素型生物碱 vittatine (7) 衍生物。法拉利,已被设计,体外合成和测试,特别强调神经退行性疾病的治疗。一些测试化合物显示出一种有趣的选择性 hBuChE 抑制特性,具有个位数的微摩尔 IC50 值。3-O-(2-甲基苯甲酰基)vittatine (7b)、3-O-(2-nitrobenzoyl)vittatine (7h) 和 3-O-(2-chlorbenzoyl)vittatine (7m) 证明了最强的 hBuChE 抑制作用,IC50值分别为 8.0 ± 0.1 µM、1.4 ± 0.1 µM 和 5.4 ± 0.1 µM。hBuChE 抑制的模式使用酶动力学分析与计算机实验相结合进行了细致的检查,后者阐明了 7b-、7h- 和 7m-hBuChE 复合物中的关键相互作用。一些测试化合物显示出一种有趣的选择性 hBuChE 抑制特性,具有一位数的微摩尔 IC50 值。3-O-(2-甲基苯甲酰基)vittatine (7b)、3-O-(2-nitrobenzoyl)vittatine (7h) 和 3-O-(2-chlorbenzoyl)vittatine (7m) 证明了最强的 hBuChE 抑制作用,IC50值分别为 8.0 ± 0.1 µM、1.4 ± 0.1 µM 和 5.4 ± 0.1 µM。hBuChE 抑制的模式使用酶动力学分析与计算机实验相结合进行了细致的检查,后者阐明了 7b-、7h- 和 7m-hBuChE 复合物中的关键相互作用。一些测试化合物显示出一种有趣的选择性 hBuChE 抑制特性,具有个位数的微摩尔 IC50 值。3-O-(2-甲基苯甲酰基)vittatine (7b)、3-O-(2-nitrobenzoyl)vittatine (7h) 和 3-O-(2-chlorbenzoyl)vittatine (7m) 证明了最强的 hBuChE 抑制作用,IC50值分别为 8.0 ± 0.1 µM、1.4 ± 0.1 µM 和 5.4 ± 0.1 µM。hBuChE 抑制的模式使用酶动力学分析与计算机实验相结合进行了细致的检查,后者阐明了 7b-、7h- 和 7m-hBuChE 复合物中的关键相互作用。
更新日期:2021-01-01
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