ASCO 2014:修复miR-18a或可预防黑色素瘤继发性耐药

2014-05-31 悄悄 译 医学论坛网

摘要号:#9040 第一作者:郭军,北京大学肿瘤医院肾癌黑色素瘤内科 标题:修复microRNA-18a对继发性耐伊马替尼转移性黑色素治疗作用的提高效应 背景:伊马替尼对携带c-kit基因突变的黑色素瘤具有显著的临床疗效。然而,大多数的黑色素瘤病人对伊马替尼很快产生耐药。在胃肠道间质瘤中已经表明,基因突变、易位、缺失、扩增以及表观遗传变化都参与了伊马替尼的继发

摘要号:#9040

第一作者:郭军,北京大学肿瘤医院肾癌黑色素瘤内科

标题:修复microRNA-18a对继发性耐伊马替尼转移性黑色素治疗作用的提高效应

背景:伊马替尼对携带c-kit基因突变的黑色素瘤具有显著的临床疗效。然而,大多数的黑色素瘤病人对伊马替尼很快产生耐药。在胃肠道间质瘤中已经表明,基因突变、易位、缺失、扩增以及表观遗传变化都参与了伊马替尼的继发性耐药。但在黑色素瘤中,伊马替尼耐药问题一直没有得到很好的评价。

方法:通过使用miRNA谱,对使用伊马替尼治疗前后的黑色素瘤耐药组织进行miRNAs差异的分析,然后通过定量PCR确认。通过划痕和体外侵袭实验评估细胞的迁移和侵袭能力。在伊马替尼耐药细胞和标本中,通过荧光素酶基因报告分析、免疫印迹和免疫组化来考察miR-18a和它们的靶标之间的关联。

结果:在伊马替尼继发性耐药的黑素瘤组织中,miR- 18a显著下调。再次新引入miR- 18a会使伊马替尼耐药细胞对伊马替尼重新敏感。细胞周期和凋亡分析表明,在细胞中过表达miR- 18a联合伊马替尼治疗会使S期细胞减少、凋亡细胞增加。划痕和体外侵袭实验表明,增加miR- 18a表达的同时用伊马替尼治疗会降低黑色素瘤细胞的迁移和转移的能力。在黑色素瘤细胞中,CCND2和Notch2已经被验证是miR-18a的真正效应因子。此外,补救实验也探索了miR- 18a、CCND2/Notch2以及表型变化之间的关系,结果表明miR- 18a介导的调节CCND2/Notch2通路作用可以提高伊马替尼耐药细胞对药物的敏感性。

结论:靶向miR- 18a足以提高伊马替尼对黑色素瘤的治疗作用,这提示修复miR- 18a很可能成为防止黑色素瘤病人继发性耐药的一个很有前途的策略。

研究链接:Effect of restoration of microRNA-18a on improvement of imatinib therapy on secondary imatinib-resistance metastatic melanoma.


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    2015-01-11 xzw113
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    2014-10-09 quxin068
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    2015-03-11 sunylz
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    2015-04-10 smallant2002
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    2015-03-08 feifers
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