代谢
放射性标记的6-硫鸟嘌呤(TG)的药代动力学与静脉注射后的β-2'-脱氧硫鸟苷(β-TGDR)进行了比较。放射性标记的尿排泄量在给药后24小时为剂量的75%。两种硫嘌呤类药物都迅速且大量地降解并排出,除了其他产物外,主要以6-硫代黄嘌呤、无机硫酸盐、S-甲基-6-硫代黄嘌呤和6-硫尿酸的形式排出。也有少量未改变的药物被排出。研究表明β-TGDR是TG的一种潜在形式。由于动物肿瘤不可避免地会对抗白血病药物6-硫鸟嘌呤产生抗药性,这种新药物β-TGDR具有潜在的临床应用价值。
THE PHARMACOKINETICS OF RADIOLABELED 6-THIOGUANINE (TG) WERE COMPARED WITH THAT OF BETA-2'-DEOXYTHIOGUANOSINE (BETA-TGDR) AFTER IV ADMIN. URINARY EXCRETION OF THE RADIOLABEL WAS 75% OF THE DOSE 24 HR AFTER ADMIN. BOTH THIOPURINES WERE RAPIDLY & EXTENSIVELY DEGRADED & EXCRETED AS 6-THIOXANTHINE, INORGANIC SULFATE, S-METHYL-6-THIOXANTHINE, & 6-THIOURIC ACID IN ADDITION TO OTHER PRODUCTS. SMALL AMOUNTS OF UNCHANGED DRUG WERE ALSO EXCRETED. STUDIES SUGGEST THAT BETA-TGDR IS A LATENT FORM OF TG. SINCE RESISTANCE TO ANTILEUKEMIC AGENT 6-THIOGUANINE INEVITABLY DEVELOPS IN ANIMAL TUMORS, THIS NEW AGENT BETA-TGDR IS OF POTENTIAL CLINICAL USE.
来源:Hazardous Substances Data Bank (HSDB)