Oncotarget:NT4或可以克服肿瘤细胞耐药性

2017-07-25 Emma MedSci原创

在癌症化疗中,治疗效果总是受到耐药性的影响。耐药性主要分为两大类,先天性耐药和获得性耐药。对于先天性耐药来说,在治疗开始时就能观察到癌细胞对药物的反应很弱或根本不反应,因此先天性耐药可以通过寻找替代医疗方案来规避。而在获得性耐药中,最初会对药物作出反应的癌细胞由于治疗诱导的适应性机制而变得逐渐耐药,因此获得性耐药在癌症的治疗中具有更大更坏的影响,因为其很难预测并且通常对许多不同种类的化疗药物具有抵

在癌症化疗中,治疗效果总是受到耐药性的影响。耐药性主要分为两大类,先天性耐药和获得性耐药。对于先天性耐药来说,在治疗开始时就能观察到癌细胞对药物的反应很弱或根本不反应,因此先天性耐药可以通过寻找替代医疗方案来规避。而在获得性耐药中,最初会对药物作出反应的癌细胞由于治疗诱导的适应性机制而变得逐渐耐药,因此获得性耐药在癌症的治疗中具有更大更坏的影响,因为其很难预测并且通常对许多不同种类的化疗药物具有抵抗作用,导致多重耐药性(MDR,multiple drug resistance),即恶性肿瘤细胞接触一种抗癌药后,继而对多种结构不同、作用机制各异的其他抗癌药产生耐药性。

先天性耐药和获得性耐药均来自癌细胞的遗传变化和表观遗传修饰。不同的适应性分子机制诱导癌细胞耐药性,耐药性意味着对酶或膜转运蛋白的功能或表达的修饰,因此研究人员尝试通过一些手段来阻止耐药性的产生,如修改药物靶点,改变药物活化途径,或者激活一些未开化的通路。

MDR通常与负责药物转运的膜活性转运蛋白的过度表达有关。NT4(含有人类神经降压素序列的四支肽)特异性结合LRP(脂蛋白受体相关蛋白受体)和膜蛋白聚糖硫酸乙酰肝素链,可以被表达这些膜靶的癌细胞有效地内化。在以前的研究中,研究人员探究了NT4的作用,通过将NT4连接到不同的功能单元或脂质体,开发了用于肿瘤成像或肿瘤治疗的分子。NT4高选择性结合不同癌症的细胞和组织,如结直肠癌胰腺癌和膀胱癌,并可以有效地和选择性地递送药物或脂质体用于癌症治疗或携带用于肿瘤成像的示踪剂。
 
由于NT4的结合和内化由癌细胞膜上的特异性NT4受体介导,研究人员推测这可能会使药物膜转运蛋白产生的耐药性被旁通,即耐药性被阻滞,因此检测了装载有药物的NT4在癌细胞系中旁通耐药性的能力。发现,MTX-NT4在缺乏叶酸还原载体表达的MTX(甲氨蝶呤,一种叶酸拮抗剂)抗性人类乳腺癌细胞中,耐药性被旁通。结果表明,NT4或可以克服肿瘤细胞耐药性,是一种可以应用于肿瘤治疗药物开发的很有潜力的癌症治疗选择性靶向剂。

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    2017-07-26 137****9095

    henhao

    0

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    2017-07-26 明天会更好!

    学习过了,谢谢分享!

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    2017-07-26 有备才能无患

    NT4或可以克服肿瘤细胞耐药性,是一种可以应用于肿瘤治疗药物开发的很有潜力的癌症治疗选择性靶向剂。

    0

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    2017-07-25 suibian2007bbb

    学习

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    2017-07-25 139****0239

    henhao

    0

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