Cancer Cell:新抑制剂可有效抑制肿瘤生长

2014-03-14 佚名 生物谷

“一物降一物”,肿瘤细胞也不例外。中科院上海生化细胞所前天宣布:科研人员发展出一个针对原癌蛋白质YAP的抑制剂,为以胃癌为代表的肿瘤治疗提供了新策略和新途径。10日晚,国际肿瘤学顶尖学术期刊《癌细胞》在线发表了这项合作研究成果。 胃癌是世界范围内死亡率仅次于肺癌的恶性肿瘤,但目前国际上对胃癌的治疗手段非常有限。 近年来,人们找到一条重要的抑癌通路——Hippo信号通路。作为体内生化因子的传导路

“一物降一物”,肿瘤细胞也不例外。中科院上海生化细胞所前天宣布:科研人员发展出一个针对原癌蛋白质YAP的抑制剂,为以胃癌为代表的肿瘤治疗提供了新策略和新途径。10日晚,国际肿瘤学顶尖学术期刊《癌细胞》在线发表了这项合作研究成果。

胃癌是世界范围内死亡率仅次于肺癌的恶性肿瘤,但目前国际上对胃癌的治疗手段非常有限。

近年来,人们找到一条重要的抑癌通路——Hippo信号通路。作为体内生化因子的传导路径,它在肿瘤发生发展及治疗方面的作用备受关注。原癌蛋白质YAP就是这条信号通路最下游的效应分子,大量临床分析发现,YAP在多种恶性肿瘤中的表达量上调明显,诱导癌细胞生长。因此,参与研究的沪上科学家认为,研发以YAP为靶点的抑制剂,可能更有效、更直接地纠正失调的Hippo信号通路,达到治疗肿瘤目的。

来自中科院生化细胞所及 “国家蛋白质科学中心·上海(筹)”的周兆才与张雷研、季红斌3个研究组合作,通过对胃癌病人样本的分析发现,YAP其实是有“克星”的。人体内存在一个天然拮抗剂蛋白——VGLL4,在胃癌组织中呈现明显下调趋势,且与肿瘤发展及恶化程度明显“负相关”。但由于这个天然“克星”VGLL4被打压,造成它与YAP之间的生理平衡被打破,因此癌细胞中的YAP处于过度激活状态,导致肿瘤生长失控。

可见,抗癌还需要一个“新克星”来“增援”。研究人员在蛋白质晶体三维结构解析的基础上,“瞄准”YAP设计并发展了一个多肽类抑制剂,可以模拟天然拮抗剂蛋白VGLL4的功能,进行治疗性干预。随后,他们采用多种技术手段,利用多个小鼠动物模型,确认这一多肽类抑制剂可有效抑制肿瘤生长。进一步的药理及毒理评估过程,也验证了带有失衡特征的癌细胞对这种抑制剂的特异敏感性。

周兆才研究员等认为,这项研究为胃癌治疗提供了一个新的选择方案,也可能为其它相似特征的恶性肿瘤提供个性化治疗策略。目前,相关研究成果已申请专利。

原始出处

Jiao S1, Wang H1, Shi Z1, Dong A2, Zhang W1, Song X1, He F1, Wang Y1, Zhang Z1, Wang W1, Wang X1, Guo T1, Li P1, Zhao Y1, Ji H3, Zhang L4, Zhou Z5.A Peptide Mimicking VGLL4 Function Acts as a YAP Antagonist Therapy against Gastric Cancer.Cancer Cell. 2014 Feb 10

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    2015-02-28 维他命
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    2014-03-17 jklm09
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