PNAS:TLR4——乳腺癌中的“双面人”

2015-06-16 佚名 生物谷

近日,来自美国德克萨斯MD安德森癌症中心的研究人员发现抑制免疫受体蛋白TLR4可能并不适用于治疗所有癌,TLR4在乳腺癌中既可促进癌细胞生长也可抑制癌细胞生长,而这种看似矛盾的作用则主要取决于TP53发生的突变类型。这项研究结果最近发表在国际学术期刊PNAS上。   TLR4有许多同家族成员,是参与许多免疫学途径的重要受体分子,之前许多研究证明TLR4是一个癌基因,能够促进肿瘤生长,

近日,来自美国德克萨斯MD安德森癌症中心的研究人员发现抑制免疫受体蛋白TLR4可能并不适用于治疗所有癌,TLR4在乳腺癌中既可促进癌细胞生长也可抑制癌细胞生长,而这种看似矛盾的作用则主要取决于TP53发生的突变类型。这项研究结果最近发表在国际学术期刊PNAS上。

 
TLR4有许多同家族成员,是参与许多免疫学途径的重要受体分子,之前许多研究证明TLR4是一个癌基因,能够促进肿瘤生长,因此一直以来人们都把TLR4看作是基于免疫疗法治疗癌症的重要靶向分子,同时也有很多针对TLR4设计开发的治疗药物正在得到研发。
 
但在这项研究中,研究人员发现TLR4要发挥促肿瘤生长功能还需要依赖TP53的活性,在一些TP53为野生型的乳腺癌细胞中,TLR4并不能发挥癌基因功能,与之相反,它可以作为生长抑制因子发挥作用,如果在这种情况下抑制TLR4会变得非常危险,这会促进肿瘤细胞的生长。随后,他们又将TLR4与TP53突变联系起来分析乳腺癌病人的生存趋势,发现当存在TP53突变时,TLR4的高水平表达与病人的生存率走低密切相关,而细胞中存在正常TP53时,病人的生存率趋势与TP53突变的情况正相反。
 
最后,研究人员还指出,这项研究发现的TLR4与TP53之间的关联性并不仅仅存在于乳腺癌,在其他一些存在TP53突变的癌症类型中,如卵巢癌、头颈癌和膀胱癌,TLR4的表达水平也比较高。
 
总得来说,这项研究发现TLR4在乳腺癌细胞中是否可以发挥癌基因作用还需要依赖TP53的突变情况,建立了TLR4与TP53活性之间的联系,对于进一步了解TLR4的癌基因作用发挥,合理使用靶向药物具有重要指导意义。

原始出处:

Svasti Haricharan1 and Powel Brown2.TLR4 has a TP53-dependent dual role in regulating breast cancer cell growth.PNAS, June 10, 2015, doi: 10.1073/pnas.1420811112 

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    2017-05-09 1e145228m78(暂无匿称)

    学习了,谢谢作者分享!

    0

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    2015-07-06 lilianxiang
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    2016-05-07 drwjr
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    2015-06-29 owlhealth

    需要学习

    0

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    2015-06-25 huaxipanxing

    看看

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