The cysteine releasing pattern of some antioxidant thiazolidine-4-carboxylic acids
作者:F. Esra Önen Bayram、Hande Sipahi、Ebru Türköz Acar、Reyhan Kahveci Ulugöl、Kerem Buran、Hülya Akgün
DOI:10.1016/j.ejmech.2016.03.019
日期:2016.5
is synthesized via cysteine, an amino acid found only in limited amounts in cells because of its neurotoxicity. Thus, to ensure an efficient GSH synthesis in case of an oxidative stress, cysteine should be provided extracellularly. Yet, given its nucleophilic properties and its rapid conversion into cystine, its corresponding disulfide, cysteine presents some toxicity and therefore is usually supplemented
如果未通过细胞防御机制阻止,则与细胞中自由基浓度显着增加相对应的氧化应激可对关键的生物大分子造成相当大的损害。低分子量巯基谷胱甘肽(GSH)构成主要的细胞内抗氧化剂之一。它是通过合成半胱氨酸,一种由于其神经毒性而仅在细胞中限量发现的氨基酸。因此,为了确保在氧化应激的情况下有效地合成GSH,应在细胞外提供半胱氨酸。然而,考虑到其亲核性质并迅速转化成胱氨酸,其相应的二硫键,半胱氨酸具有一定的毒性,因此通常在前药方法中进行补充。在此,一些噻唑烷-4-羧酸的合成和评价它们的抗氧化特性通过DDPH和CUPRAC分析。然后,在水性和有机介质中研究所得化合物的半胱氨酸释放能力,以使分子的相关抗氧化特性与其半胱氨酸释放模式相关联。结果,该结构的抗氧化性能不仅归因于半胱氨酸的释放,还归因于噻唑烷循环本身。