Prodrugs of L-cysteine as protective agents against acetaminophen-induced hepatotoxicity. 2-(Polyhydroxyalkyl)- and 2-(polyacetoxyalkyl)thiazolidine-4(R)-carboxylic acids
作者:Jeanette C. Roberts、Herbert T. Nagasawa、Richard T. Zera、Robert F. Fricke、David J. W. Goon
DOI:10.1021/jm00393a034
日期:1987.10
prodrugs of L-cysteine (1a-h) were synthesized by the condensation of the sulfhydryl amino acid with naturally occurring aldose monosaccharides containing three, five, and six carbon atoms. The resulting 2-(polyhydroxyalkyl)thiazolidine-4(R)-carboxylic acids (TCAs) are capable of releasing L-cysteine and the sugars by nonenzymatic ring opening and hydrolysis. Thus, when added to rat hepatocyte preparations
通过巯基氨基酸与天然存在的含三个,五个和六个碳原子的醛糖单糖的缩合,合成了八个L-半胱氨酸的前药(1a-h)。所得的2-(聚羟基烷基)噻唑烷-4(R)-羧酸(TCA)能够通过非酶开环和水解而释放L-半胱氨酸和糖。因此,当将它们添加到体外大鼠肝细胞制剂中时,这些TCA(1.0 mM)相对于对照组将细胞谷胱甘肽(GSH)的水平提高了1.2-2.1倍。基于这一发现,在小鼠模型中测试了半胱氨酸前药作为对乙酰氨基酚诱导的肝毒性的保护剂。衍生自D-核糖和L-半胱氨酸的TCA(RibCys,1d)显示了该系列的最大治疗前景,存活率为100%(12/12),而未经治疗的为17%。但是,这些前药对大鼠肝细胞中GSH产生的刺激程度与对小鼠的保护程度无关,这表明药代动力学参数必须在体内超越。为了评估脂质溶解度增加的效果,我们通过在缩合反应中使用过乙酰化醛糖制备了前药2a-c。然而,这些化合物对小鼠表现出急性毒性