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首页> 外文期刊>Cellular Signalling >Allosteric modulation by protein kinase Cε leads to modified responses of EGF receptor towards tyrosine kinase inhibitors
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Allosteric modulation by protein kinase Cε leads to modified responses of EGF receptor towards tyrosine kinase inhibitors

机译:蛋白激酶Cε的变构调节导致EGF受体对酪氨酸激酶抑制剂的反应改变

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摘要

Recently, we described a novel function of over-expressed protein kinase Cε (PKCε) as a negative allosteric modulator of EGFR signalling in several head and neck squamous carcinoma (HNSCC) cell lines. Extending this work, here we present several lines of evidence for the potency of PKCε to differently modulate the efficacy of EGFR tyrosine kinase inhibitors (TKIs) such as gefitinib and lapatinib. Using the HNSCC cell line FaDu as a model, we demonstrate by co-immunoprecipitation the physical association of over-expressed PKCε with the EGFR which is stabilised by gefitinib and leads to an increase in gefitinib-induced inhibition of EGFR downstream signalling and elevated EGFR-ErbB2 heterodimerisation. Cell cycle and Western blot analysis revealed that the gefitinib-induced apoptosis was enhanced whereas the pro-apoptotic effect of lapatinib that requires another EGFR conformation was reduced by PKCε. Our findings suggest that due to elevated expression PKCε may associate with the EGFR resulting in conformational changes and different allosteric modulation of the EGFR behaviour towards TKIs. This surprising capacity indicates PKCε as a novel predictive marker protein in molecular cancer therapy with EGFR tyrosine kinase inhibitors.
机译:最近,我们描述了过表达的蛋白激酶Cε(PKCε)作为几种头颈鳞状细胞癌(HNSCC)细胞系中EGFR信号的负变构调节剂的新功能。扩展这项工作,在这里我们为PKCε潜在地调节吉非替尼和拉帕替尼等EGFR酪氨酸激酶抑制剂(TKI)的功效提供了几条证据。使用HNSCC细胞系FaDu作为模型,我们通过共免疫沉淀法证明了过量表达的PKCε与由吉非替尼稳定的EGFR的物理联系,并导致吉非替尼诱导的EGFR下游信号传导抑制和EGFR-升高的现象增加ErbB2异二聚体。细胞周期和蛋白质印迹分析表明,吉非替尼诱导的凋亡增强,而PKCε降低了需要另一种EGFR构象的拉帕替尼的促凋亡作用。我们的发现表明,由于表达升高,PKCε可能与EGFR结合,导致EGFR行为向TKI的构象变化和不同的变构调节。这种令人惊讶的能力表明PKCε是用EGFR酪氨酸激酶抑制剂进行的分子癌症治疗中的新型预测标记蛋白。

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