Structural Optimization of Azadipeptide Nitriles Strongly Increases Association Rates and Allows the Development of Selective Cathepsin Inhibitors
摘要:
Using the example of cathepsin K, we demonstrate the design of highly potent and selective azadipeptide nitrite inhibitors A systematic scan with respect to P2 and P3 substituents was carried out Structural modifications strongly affected the enzyme-inhibitor association (but not dissociation) rate A combination of optimized P2 and P3 substituents with a methylation of the P3-P2 amide linker resulted in the picomolar cathepsin K inhibitor 19 with remarkable selectivity over cathepsins L, B, and S
Synthesis and preliminary radiopharmacological characterisation of an <sup>11</sup>
C-labelled azadipeptide nitrile as potential PET tracer for imaging of cysteine cathepsins
model derived from a mammary tumour cell line by small animal PETimaging indicates tumour targeting with complex pharmacokinetics. Radiotracer uptake in the tumour region was considerably lower under treatment with the nonradioactive reference compound and the epoxide-based irreversible cysteinecathepsin inhibitor E64. The in vivo behaviour observed for this radiotracer largely confirms that of the
合成了含 O-甲基酪氨酸的氮杂二肽腈,并研究了其对组织蛋白酶 L、S、K 和 B 的抑制活性。碳 11 标记是通过相应酚类前体与 [11 C] 甲基碘的反应来完成的回旋加速器产生的 [11 C] 甲烷。通过小动物 PET 成像对源自乳腺肿瘤细胞系的小鼠异种移植模型中所得放射性示踪剂的放射性药理学评估表明具有复杂药代动力学的肿瘤靶向。在用非放射性参考化合物和基于环氧化物的不可逆半胱氨酸组织蛋白酶抑制剂 E64 治疗后,肿瘤区域的放射性示踪剂摄取显着降低。