Cell death&differ:中国科学家发现抑制乳腺癌肿瘤干细胞新策略

2015-01-22 佚名 生物谷

近日,国际生物学期刊cell death &differentiation发表了来自加拿大和中国科学家的一项最近研究成果。研究人员通过体内和体外实验证明激活toll-like receptor 3(TLR3)能够促进乳腺癌细胞向肿瘤干细胞(CSC)转化,产生干细胞特征,而TLR3的这种促CSC转化效应需要同时激活β catenin和NF-κB信号通路才能发生。这一研究成果为癌症治疗中抑制CSC

近日,国际生物学期刊cell death &differentiation发表了来自加拿大和中国科学家的一项最近研究成果。研究人员通过体内和体外实验证明激活toll-like receptor 3(TLR3)能够促进乳腺癌细胞向肿瘤干细胞(CSC)转化,产生干细胞特征,而TLR3的这种促CSC转化效应需要同时激活β catenin和NF-κB信号通路才能发生。这一研究成果为癌症治疗中抑制CSC产生提供了新的策略。
 
研究人员指出,在2012年的统计中,乳腺癌是导致女性死亡的第二大疾病。传统疗法如放疗和化疗能够消除肿瘤肿块,但对少数具有恶性作用的肿瘤细胞仍然不能起到完全杀死的作用,这些恶性肿瘤细胞仍然能够存活并自我更新,进一步发展为恶性肿瘤,这一类细胞就叫做肿瘤干细胞。研究发现,肿瘤干细胞对传统疗法具有抵抗作用,并且能够在某些条件下由非肿瘤干细胞转化而来。而TLR3在不良预后的乳腺癌病人中具有更高的表达,但TLR3与乳腺癌细胞向肿瘤干细胞转化之间的关系仍然不清楚。
 
研究人员首先通过体外细胞培养发现,激活TLR3能够促进乳腺癌细胞产生类似肿瘤干细胞的特征,但TLR5,7,8并不能起到相同作用。通过对机制进一步探讨,单独激活NF-κB信号通路并不能引起乳腺癌细胞向肿瘤干细胞的转化,而当同时激活β catenin和NF-κB信号同路时,才能够促进TLR3介导的乳腺癌细胞向肿瘤干细胞的转化。研究人员还发现,利用小豆蔻明处理乳腺癌细胞能够阻断β catenin和NF-κB信号通路,导致TLR3介导的CSC转化过程受到抑制。
 
综上所述,该项研究发现TLR3能够同时激活β catenin和NF-κB信号通路,促进乳腺癌细胞向肿瘤干细胞转化,并且发现小豆蔻明能够阻断TLR3的这种作用,抑制肿瘤细胞向肿瘤干细胞的转化。这一研究成果为抑制CSC产生,提高癌症治愈率提供了新的策略。

原始出处

Jia D1, Yang W2, Li L1, Liu H3, Tan Y1, Ooi S1, Chi L4, Filion LG1, Figeys D5, Wang L6.β-Catenin and NF-κB co-activation triggered by TLR3 stimulation facilitates stem cell-like phenotypes in breast cancer.Cell Death Differ. 2015 Feb;

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    2015-12-31 isabellayj
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    2015-11-17 维他命
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    2015-01-24 cy0328

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