Disubstituted sialic acid ligands targeting siglecs CD33 and CD22 associated with myeloid leukaemias and B cell lymphomas
作者:Cory D. Rillahan、Matthew S. Macauley、Erik Schwartz、Yuan He、Ryan McBride、Britni M. Arlian、Janani Rangarajan、Valery V. Fokin、James C. Paulson
DOI:10.1039/c4sc00451e
日期:——
The siglec family of sialic acid-binding proteins are endocytic immune cell receptors that are recognized as potential targets for cell directed therapies. CD33 and CD22 are prototypical members and are validated candidates for targeting acute myeloid leukaemia and non-Hodgkin's lymphomas due to their restricted expression on myeloid cells and B-cells, respectively. While nanoparticles decorated with high affinity siglec ligands represent an attractive platform for delivery of therapeutic agents to these cells, a lack of ligands with suitable affinity and/or selectivity has hampered progress. Herein we describe selective ligands for both of these siglecs, which when displayed on liposomal nanoparticles, can efficiently target the cells expressing them in peripheral human blood. Key to their identification was the development of a facile method for chemo-enzymatic synthesis of disubstituted sialic acid analogues, combined with iterative rounds of synthesis and rapid functional analysis using glycan microarrays.
Siglec家族是结合唾液酸的内吞免疫细胞受体,被视为细胞靶向治疗的潜在目标。CD33和CD22是其典型成员,由于它们在髓系细胞和B细胞上的特异性表达,它们被验证为针对急性髓系白血病和非霍奇金淋巴瘤的靶向候选者。尽管装饰有高亲和力siglec配体的纳米颗粒代表了一种将治疗药物传递给这些细胞的有吸引力的平台,但缺乏适合的亲和力和/或选择性的配体阻碍了进展。在此,我们描述了针对这两种siglec的选择性配体,当这些配体展示在脂质体纳米颗粒上时,可以有效地靶向在外周人类血液中表达它们的细胞。其识别的关键在于开发了一种简便的方法,用于化学酶合成二取代唾液酸类似物,结合多轮合成和使用糖微阵列的快速功能分析。