In the search for drugs that could control excessive leukocyte extravasation, we now report on modifications of the already known potent E-selectin antagonist 3 containing a cyclohexyllactic acid residue and a glucal-derived building block. Thus, we describe the synthesis and biological evaluation of a series of derivatives 6 with modified glucal-derived moieties ((CH2NRR2)-R-1 instead of CH2OH in 3) to explore a hypothetical potential complementary interaction with E-selectin. However, similar activity profiles of most derivatives 6 and compound 3 do not support such an interaction, but rather indicate topological-structure changes of 6 (and 3) in the orientation of the neighboring fucose and galactose due to intramolecular steric interactions. The most potent E-selectin antagonist 6v showed >50-fold improved E-selectin inhibition compared to the weak selectin ligand sialyl Lewis(x) (sLe(x), 1; IC50 = 1000-1500 muM), but only a 2-fold improvement compared to 3. Compound 6x was tested in vivo in a murine model of acute inflammation and found to be as potent as 3 (ED50 = 15 mg/kg).
In the search for drugs that could control excessive leukocyte extravasation, we now report on modifications of the already known potent E-selectin antagonist 3 containing a cyclohexyllactic acid residue and a glucal-derived building block. Thus, we describe the synthesis and biological evaluation of a series of derivatives 6 with modified glucal-derived moieties ((CH2NRR2)-R-1 instead of CH2OH in 3) to explore a hypothetical potential complementary interaction with E-selectin. However, similar activity profiles of most derivatives 6 and compound 3 do not support such an interaction, but rather indicate topological-structure changes of 6 (and 3) in the orientation of the neighboring fucose and galactose due to intramolecular steric interactions. The most potent E-selectin antagonist 6v showed >50-fold improved E-selectin inhibition compared to the weak selectin ligand sialyl Lewis(x) (sLe(x), 1; IC50 = 1000-1500 muM), but only a 2-fold improvement compared to 3. Compound 6x was tested in vivo in a murine model of acute inflammation and found to be as potent as 3 (ED50 = 15 mg/kg).
Simplified Sialyl Lewisx Analogues with Improved E-Selectin Inhibition
作者:Gebhard Thoma、Franz Schwarzenbach
DOI:10.1002/hlca.200390085
日期:2003.3
simplified sialyl Lewisx mimic 5 containing a D-arabinose, a 3-cyclohexyl-2-hydroxypropanoate, and a tetrahydropyran building block instead of L-fucose, sialic acid, and N-acetylglucosamine, respectively was synthesized. Compound 5 was 10-fold more potent than sLex in a static E-selectinbinding assay and showed at 50 μM 75% inhibition in a dynamic-flow assay in which sLex did not inhibit neutrophil
合成了分别包含D-阿拉伯糖,3-环己基-2-羟基丙酸酯和四氢吡喃结构单元而不是L-岩藻糖,唾液酸和N-乙酰基葡糖胺的简化的唾液酸化的Lewis x mimic 5。在静态E-选择素结合测定中,化合物5的效力比sLe x高10倍,在动态流量测定中,sLe x在最高1000μM时不抑制嗜中性粒细胞滚动,在动态流量测定中显示50%抑制75%。与sLe x相比,具有乳酸而不是唾液酸结构单元的化合物7的效能提高了三倍。