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Cancer Cell:杀灭癌细胞的新药物NSC319726被发现

2012-05-19 T.Shen 生物谷

近日,刊登在国际著名杂志Cancer Cell上的一项研究表明,一种化合物可以通过修复人类癌症突变蛋白(肿瘤抑制基因p53编码)的结构和功能来有选择性的杀灭癌细胞。文章中,研究者识别出了一种新的潜在的抗癌药物,这种药物以常见的第三个突变的p53基因-p53-R175H为靶点。 在人类机体中,p53可以识别细胞压力以及及时控制细胞增值,或者杀灭不能进行自我损伤修复的细胞。在近乎一半的癌症病人身上,

近日,刊登在国际著名杂志Cancer Cell上的一项研究表明,一种化合物可以通过修复人类癌症突变蛋白(肿瘤抑制基因p53编码)的结构和功能来有选择性的杀灭癌细胞。文章中,研究者识别出了一种新的潜在的抗癌药物,这种药物以常见的第三个突变的p53基因-p53-R175H为靶点。

在人类机体中,p53可以识别细胞压力以及及时控制细胞增值,或者杀灭不能进行自我损伤修复的细胞。在近乎一半的癌症病人身上,编码p53的基因都突变了,p53功能的缺失会引起一系列的癌症症状,比如癌细胞具有侵袭性、转移性、对化学疗法或者放射疗法低敏感性,用药物恢复p53的功能被认为是未来潜在的治疗癌症的方法,然而,很难找到一种化合物来恢复肿瘤抑制基因p53的功能。

Alexei Vazquez博士表示,他们基于电脑筛选的方法找到了一种化合物,可以以肿瘤细胞p53为靶点,但是并不以正常细胞的p53为靶点。研究者的这种筛选方法比较独特,因为这涉及了癌细胞的多种遗传背景,研究者识别出的化合物可以杀死含有p53基因突变的癌细胞,其中有一种化合物可以恢复基因p53-R175H的突变,而且研究者确保人体的正常细胞是不会受这种化合物影响的。

此外,识别出的这种化合物可以有选择性的恢复突变基因p53-R175H的功能,研究者的发现同样支持了靶向癌症治疗的方法,研究者Carpizo表示,我们的研究发现将为未来的癌症治疗提供重要的线索和建议,未来,病人癌症的治疗效率将依赖于病人癌症的基因型差别。

doi:10.1016/j.ccr.2012.03.042
PMC:
PMID:

Allele-Specific p53 Mutant Reactivation

Xin Yu, Alexei Vazquez, Arnold J. Levine, Darren R. Carpizo

Rescuing the function of mutant p53 protein is an attractive cancer therapeutic strategy. Using the National Cancer Institute's anticancer drug screen data, we identified two compounds from the thiosemicarbazone family that manifest increased growth inhibitory activity in mutant p53 cells, particularly for the p53R175 mutant. Mechanistic studies reveal that NSC319726 restores WT structure and function to the p53R175 mutant. This compound kills p53R172H knockin mice with extensive apoptosis and inhibits xenograft tumor growth in a 175-allele-specific mutant p53-dependent manner. This activity depends upon the zinc ion chelating properties of the compound as well as redox changes. These data identify NSC319726 as a p53R175 mutant reactivator and as a lead compound for p53-targeted drug development.

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    2012-06-04 维他命
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    2012-05-21 yxch36

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流行病学研究已经表明,慢性心理压力能够促进肿瘤发生。然而在体内,慢性心理压力与肿瘤发生之间的联系以及潜在的机制还不明确。 近日,美国新泽西医科和牙科大学的研究人员对此开展了一项研究,该研究对慢性压力能够促进体内肿瘤发生提供了直接证据。相关论文发表在5月1的PNAS上。 研究发现,在已建立的老鼠模型中,慢性束缚显著促进了电离辐射(IR)诱导的肿瘤生成。 肿瘤抑制蛋白p53在肿瘤抑制中起着极其重

FDA:来那度胺增加多发性骨髓瘤患者第二原发肿瘤危险

  2012年5月7日,美国食品与药物管理局(FDA)发布通告称,多项临床试验结果显示,与接受安慰剂治疗相比,新诊断的多发性骨髓瘤(MM)患者接受抗肿瘤药物来那度胺治疗可增加第二原发肿瘤发生危险;尤其是增加急性髓细胞白血病(AML)、骨髓增生异常综合征(MDS)和霍奇金淋巴瘤的危险。来那度胺(商品名:Revlimid)药物标签的警告和注意事项部分和患者用药指导添加了这一安全信息。FDA建议,临床医

JBC:癌细胞内组蛋白mH2A1.2与HER-2之间相互作用的机制

原癌基因人类表皮生长因子受体2(HER-2)一般在癌细胞内过量表达,但是其机制目前仍不明确。近日,来自夏威夷大学的研究人员Scott K. Kuwada等人表示,癌细胞内非典型组蛋白macroH2A1.2与HER-2的相互作用能够促进原癌基因的表达及细胞增生。 研究发现,在HER-2过表达的癌细胞内,非典型组蛋白macroH2A1能够与HER-2相互作用。人类mH2A1具有两种亚型,mH2A1.

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