Structural effects of N-aromatic acyl-amino acid conjugates on their deconjugation in the cecal contents of rats: implication in design of a colon-specific prodrug with controlled conversion rate at the target site
作者:Hyesik Kong、Hyunjeong Kim、Heejeong Do、Yonghyun Lee、Sungchae Hong、Jeong-Hyun Yoon、Yunjin Jung、Young Mi Kim
DOI:10.1002/bdd.763
日期:2011.9
N-aromatic acyl-amino acid conjugates was examined in the cecal contents. On incubation of conjugates with glycine, D or/and L forms of alanine or phenylalanine in the cecal contents, the conjugates with D amino acids were not hydrolysed. The other conjugates are susceptible to the hydrolysis, the rates of which decreased as the size of the substituent on the 2-position of the amino acids increased. The conjugates
N-芳族酰基-氨基酸缀合物具有靶向结肠的特性,这意味着此类缀合物是稳定的并且在到达大肠之前不被吸收,在大肠中它们被微生物转化(水解)为具有治疗活性的母体药物。为了研究N-芳族酰基-氨基酸缀合物对大肠去结合的结构影响,在盲肠内容物中检查了各种N-芳族酰基-氨基酸缀合物的水解。在将共轭物与甘氨酸,盲肠内容物的D或/和L形式的丙氨酸或苯丙氨酸一起孵育后,具有D氨基酸的共轭物不被水解。其他缀合物易于水解,其速率随着氨基酸2-位上取代基大小的增加而降低。具有甘氨酸和牛磺酸的烷基类似物(2-4个碳原子)的结合物具有抗水解性,而牛磺酸和甘氨酸的结合物则被有效地水解。N-芳族酰基-甘氨酸缀合物的水解通过芳族酰基部分上的吸电子基团的对位取代而得到增强,反之亦然。尽管邻位上的甲基,甲氧基或氯基阻止了水解,但位上的羟基却加速了水解。我们的数据可能为设计大肠内转化率受控的结肠特异性前药提供有用的信息。N-芳族酰基