Synthesis and Biological Evaluation of RGD Peptidomimetic-Paclitaxel Conjugates Bearing Lysosomally Cleavable Linkers
作者:Alberto Dal Corso、Michele Caruso、Laura Belvisi、Daniela Arosio、Umberto Piarulli、Clara Albanese、Fabio Gasparri、Aurelio Marsiglio、Francesco Sola、Sonia Troiani、Barbara Valsasina、Luca Pignataro、Daniele Donati、Cesare Gennari
DOI:10.1002/chem.201500158
日期:2015.4.27
concentrations and showed good stability at pH 7.4 and pH 5.5. Cleavage of the two peptide linkers was observed in the presence of lysosomal enzymes, whereas conjugate 8, which possesses a nonpeptide “uncleavable” linker, remained intact under these conditions. The antiproliferative activities of the conjugates were evaluated against two isogenic cell lines expressing the integrin receptor at different levels:
两个小分子-药物偶联物(SMDCs,6和7),具有lysosomally可切割的接头(即缬氨酸-丙氨酸和Phe-赖氨酸的肽序列)由α偶联合成v β 3整合素配体环[DKP-RGD] ‐CH 2 NH 2(2)与抗癌药紫杉醇(PTX)。还合成了带有非肽“不可裂解”接头的第三个环[DKP–RGD] –PTX缀合物(8),作为阴性对照进行测试。这三个SMDCs能够抑制生物素化的玻连蛋白结合到纯化的α V β 3整联蛋白受体在纳摩尔浓度,在pH 7.4和pH 5.5下显示出良好的稳定性。在溶酶体酶的存在下观察到两个肽接头的切割,而具有非肽“不可切割”接头的缀合物8在这些条件下保持完整。缀合物的抗增殖活性针对表达整联在不同级别受体2个同基因细胞系进行了评价:急性淋巴母细胞白血病细胞系CCRF-CEM(α V β 3 - )和其亚克隆CCRF-CEMα V β 3(α V β 3 +)。环显示了相当有效的整联蛋白靶向性[DKP-RGD]