In Vitro and In Vivo Analyses of 14-O-Acylanthracyclines

14-O-酰基蒽环类药物的体外和体内分析

• 批准号: 7038329
• 负责人: LEONARD LOTHSTEIN
• 金额: $ 29.23万
• 依托单位: UNIVERSITY OF TENNESSEE HEALTH SCI CTR
• 依托单位国家: 美国
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2008-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7038329
• 关键词: SCID mouse; anthracyclines; antineoplastics; apoptosis; calcium flux; cell line; cytochrome c; drug resistance; enzyme activity; membrane permeability; membrane potentials; mitochondria; neoplasm /cancer transplantation; pharmacokinetics; protein kinase C

DESCRIPTION (provided by applicant): The 14-O-acyl anthracyclines, represented by N-benzyladriamycin-14-valerate (AD 198) and N-benzyladriamycin-14-pivalate (AD 445), are functionally distinct from doxorubicin (DOX) and other DNA-binding anthracyclines. AD 198 and AD 445 localize in the cytoplasm, specifically bind to the C1 regulatory domain of protein kinase C (PKC) and activate PKC in a manner that rapidly triggers apoptosis in proliferating cells. As we have shown, AD 198 and AD 445 activate mitochondrial-associated PKC-d holoenzyme to trigger mitochondrial membrane depolarization and cytochrome c release in 32D.3 routine myeloid cells. Unlike non-PKC binding anthracyclines, such as DOX, AD 198 and AD 445 cytotoxicity is unaffected by Bcl-2 or Bcl-XL anti-apoptotic protein expression or p53 protein dysfunction in a variety of cell types. AD 198 and AD 445 also circumvent resistance conferred by multidrug transport proteins and altered topoisomerase II activity, In vivo, AD 198 demonstrates tumoricidal activity greater than DOX, with reduced myelosuppression and no significant organ toxicity, including a lack of cardiotoxicity. This proposal describes the next stages of analysis of AD 198 and AD 445 leading to clinical trials. The overall goals of this study are first, to analyze the mechanism by which PKC activation by AD 198 and AD 445 leads to rapid apoptosis. We will begin with 32D.3 cells to determine how drug-induced PKC-d activation leads to mitochondrial depolarization and cytochrome c release in a manner that is unaffected by Bcl-2 or Bcl-XL status. Second, given the clear advantage of these agents over DOX thus far in vitro and in vivo, we will continue these studies by assessing the in vivo efficacy of AD 198 an d AD 445 against implanted HL60 human leukemia cells expressing a variety of resistance mechanisms (Bcl-21P-gplMRPIp53-1-). Completion of these studies will establish in greater detail a mechanism of AD 198 and AD 445 induction of apoptosis and determine whether these novel agents can circumvent multiple, clinically relevant mechanisms of drug resistance in vivo.

描述（由申请人提供）：由N-苯甲酰亚霉素14-价酸代表（AD 198）和N-苯甲酰亚霉素14-Pivalate（AD 445）代表的14-O-acyl蒽环类药物在功能上与Doxorubiubicin（dox）和其他DNA结合拟人素不同。 AD 198和AD 445位于细胞质中，特别结合了蛋白激酶C（PKC）的C1调节结构域，并以快速触发增殖细胞中凋亡的方式激活PKC。如我们所示，AD 198和AD 445激活线粒体相关的PKC-D Holoenzyme，以触发线粒体膜去极化和细胞色素C释放32D.3常规髓样细胞。与非PKC结合蒽环类药物不同，例如DOX，AD 198和AD 445细胞毒性不受BCL-2或BCL-XL抗凋亡蛋白表达或p53蛋白功能障碍的影响。 AD 198和AD 445还规避了由多药转运蛋白赋予的耐药性，并改变了拓扑异构酶II活性，在体内，AD 198显示出大于DOX的肿瘤活性大于DOX，并且骨髓抑制降低，没有显着的器官毒性，包括缺乏心脏毒性。该提案描述了AD 198和AD 445分析的下一个阶段，导致临床试验。这项研究的总体目标首先是分析PKC通过AD 198和AD 445导致快速凋亡的机制。我们将从32d.3细胞开始，以确定药物诱导的PKC-D激活如何导致线粒体去极化和细胞色素C释放，而这种方式不受BCL-2或BCL-XL状态的影响。其次，鉴于这些试剂的明显优势比到目前为止的DOX在体外和 Vivo，我们将通过评估AD 198和AD 445对植入的HL60人白血病细胞的体内功效来继续这些研究，表达了多种抗性机制（BCL-21P-GPLMRPIP53-1-）。这些研究的完成将更详细地建立AD 198和AD 445诱导凋亡的机制，并确定这些新型药物是否可以规避体内耐药性的多种临床相关机制。