AbstractEngineering bioactive iminosugars with pH‐responsive groups is an emerging approach to develop pharmacological chaperones (PCs) able to improve lysosomal trafficking and enzymatic activity rescue of mutated enzymes. The use of inexpensive l‐malic acid allowed introduction of orthoester units into the lipophilic chain of an enantiomerically pure iminosugar affording only two diastereoisomers contrary to previous related studies. The iminosugar was prepared stereoselectively from the chiral pool (d‐mannose) and chosen as the lead bioactive compound, to develop novel candidates for restoring the lysosomal enzyme glucocerebrosidase (GCase) activity. The stability of orthoester‐appended iminosugars was studied by 1H NMR spectroscopy both in neutral and acidic environments, and the loss of inhibitory activity with time in acid medium was demonstrated on cell lysates. Moreover, the ability to rescue GCase activity in the lysosomes as the result of a chaperoning effect was explored. A remarkable pharmacological chaperone activity was measured in fibroblasts hosting the homozygous L444P/L444P mutation, a cell line resistant to most PCs, besides the more commonly responding N370S mutation.
摘要设计具有 pH 响应基团的
生物活性亚
氨基糖是开发药理伴侣(PC)的一种新兴方法,它能够改善溶酶体的转运和突变酶的酶活性挽救。使用廉价的 l-
苹果酸可以在对映体纯度较高的亚
氨基糖的亲脂链中引入正酯单元,从而只产生两种非对映异构体,这与之前的相关研究相反。这种亚
氨基糖是从手性池(d-
甘露糖)中立体选择性制备出来的,并被选为具有
生物活性的先导化合物,用于开发恢复溶酶体
葡萄糖脑苷脂酶(GCase)活性的新型候选化合物。通过 1H NMR 光谱研究了正交酯添加的亚
氨基糖在中性和酸性环境中的稳定性,并在细胞裂解液上证明了其在酸性介质中的抑制活性会随着时间的推移而减弱。此外,研究人员还探究了 GCase 在溶酶体中作为伴侣效应的结果来挽救 GCase 活性的能力。在含有同源 L444P/L444P 突变的成纤维细胞中测得了明显的药理伴侣活性,这种
细胞系对大多数多
氯联苯具有抗性,此外还有更常见的 N370S 突变。