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    • 43. 发明授权
    • Method for suppressing multiple drug resistance in cancer cells
    • 抑制癌细胞多重耐药性的方法
    • US06210917B1
    • 2001-04-03
    • US08956657
    • 1997-10-23
    • Dennis A. CarsonCarlos J. Carrera
    • Dennis A. CarsonCarlos J. Carrera
    • C12Q134
    • C07K16/40C12N9/1077C12Q1/25C12Q1/6886C12Q2600/106C12Q2600/156G01N33/5005G01N33/573
    • Methods for treating and preventing the onset and maintainance of multiple drug resistance (MDR) in animals undergoing chemotherapy for cancer are provided. According to the methods, target cells are depleted of adenosine 5′-monophosphate (AMP) and adenosine 5′-triphosphate (ATP) such that the cells are unable to support P-glycoprotein activity. According to one method, a population of target cells is obtained from a host and assayed for loss of methylthioadenosine phosphorylase (MTAse) activity. MTAse catabolizes methylthioadenosine to adenine for endogenous salvage incorporation into the intracellular AMP pool. MTAse deficient cells are treated with a purine synthesis inhibitor, such as L-alanosine, which starves the cells of adenine and suppresses P-glycoprotein activity. MTAse competent cells are also treated for MDR with purine synthesis inhibitors. In conjunction with treatment according to the invention, MTAse competent and deficient cells are also treated for malignancy with other anti-cancer drugs. A method for protecting non-malignant cells from adenine starvation during treatment of malignant cells according to the invention is provided.
    • 提供了治疗和预防接受化疗癌症的动物多发耐药(MDR)发病和维持的方法。 根据该方法,靶细胞耗尽腺苷5'-单磷酸(AMP)和腺苷5'-三磷酸(ATP),使得细胞不能支持P-糖蛋白活性。 根据一种方法,从宿主获得靶细胞群并测定甲硫基腺苷磷酸化酶(MTAse)活性的损失。 MTAs将甲基硫代腺苷分解为腺嘌呤,用于内源性补救并入细胞内AMP库。 MTAse缺陷细胞用嘌呤合成抑制剂如L-肌氨酸处理,其使腺嘌呤的细胞饥饿并抑制P-糖蛋白活性。 MTAse感受态细胞也用嘌呤合成抑制剂治疗MDR。 结合根据本发明的治疗,MTAs感受态细胞和缺陷细胞也用其它抗癌药治疗恶性肿瘤。 提供了根据本发明的在恶性细胞治疗期间保护非恶性细胞免于腺嘌呤饥饿的方法。