Antitumor characteristics of the conjugate of N4-(4-carboxybutyryl)-ara-C with ethylenediamine-introduced dextran and its resistance to cytidine deaminase.
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引用次数: 0
Abstract
By oxidation of dextran, and reduction of the Schiff bases formed by reaction of the oxidised dextran with diaminoalkanes, several diaminoalkane-introduced dextrans were prepared and evaluated as drug carriers. Conjugates between N4-(4-carboxyburyryl)-1-beta-D-arabinofuranosylcytosine (glu-ara-C) and such drug carriers were prepared, and selected conjugates were tested in vivo, and investigated for inhibitory effects on cytidine deaminase. Ethylenediamine-introduced dextran prepared under 10% oxidation conditions was found to be most useful as a drug carrier from its chemical characteristics and toxicity evaluation in BDF1 mice. The conjugate obtained from glu-ara-C and ethylenediamine-introduced dextran 2000 showed high antitumor activity, significant at the relatively low dose of 100 mg equivalent ara-C/kg, in BDF1 mice bearing L1210 leukemia cells. Glu-ara-C and the conjugate were unaffected by cytidine deaminase under conditions in which 1-beta-D-arabinofuranosylcytosine was degraded rapidly to 1-beta-D-arabinofuranosyluracil.
通过对右旋糖酐的氧化,以及氧化右旋糖酐与二氨基烷烃反应形成的希夫碱的还原,制备了几种引入二氨基烷烃的右旋糖酐,并对其作为药物载体进行了评价。制备了N4-(4-羧基buryryl)-1- β - d -阿拉伯糖醛酸胞嘧啶(glu-ara-C)与这些药物载体的偶联物,并对选定的偶联物进行了体内检测,考察了其对胞苷脱氨酶的抑制作用。通过对BDF1小鼠的化学特性和毒性评价,发现在10%氧化条件下制备的乙二胺引入葡聚糖是最有用的药物载体。从葡萄糖-ara-C和乙二胺引入的葡聚糖2000中获得的结合物在携带L1210白血病细胞的BDF1小鼠中显示出很高的抗肿瘤活性,在相对较低的剂量为100 mg当量ara-C/kg时显著。在1- β - d -阿拉伯糖醛酸胞嘧啶快速降解为1- β - d -阿拉伯糖醛酸胞嘧啶的条件下,葡萄糖-阿拉- c和缀合物不受胞苷脱氨酶的影响。