High- and low-affinity epidermal growth factor receptor-ligand interactions activate distinct signaling pathways.

High- and low-affinity epidermal growth factor receptor-ligand interactions activate distinct signaling pathways.
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DOI:
10.1371/journal.pone.0015945
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发表时间:
2011-01-10
期刊:
影响因子:
3.7
通讯作者:
MacBeath G
MacBeath G
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Krall JA;Beyer EM;MacBeath G

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表皮生长因子受体(EGFR)介导的信号转导在正常发育过程中起着至关重要的作用,而EGFR信号的异常与多种癌症的发生密切相关。在这里,我们发现EGFR与其配体之间的高亲和力和低亲和力相互作用激活了不同的信号通路。虽然高亲和力的配体结合足以激活大多数典型的信号通路,但低亲和力结合是激活信号转导和转录激活因子(STAT)和磷脂酶C-伽马1(PLCγ1)所必需的。由于Stat蛋白参与了许多细胞反应,包括增殖、迁移和凋亡,这些结果赋予了低亲和力相互作用的功能,而EGFR信号的计算模型忽略了这一功能。具有不同信号特性的受体的存在为EGFR提供了一种以不同的方式对同一配体的不同浓度做出反应的方法。
Signaling mediated by the Epidermal Growth Factor Receptor (EGFR) is crucial in normal development, and aberrant EGFR signaling has been implicated in a wide variety of cancers. Here we find that the high- and low-affinity interactions between EGFR and its ligands activate different signaling pathways. While high-affinity ligand binding is sufficient for activation of most canonical signaling pathways, low-affinity binding is required for the activation of the Signal transducers and activators of transcription (Stats) and Phospholipase C-gamma 1 (PLCγ1). As the Stat proteins are involved in many cellular responses including proliferation, migration and apoptosis, these results assign a function to low-affinity interactions that has been omitted from computational models of EGFR signaling. The existence of receptors with distinct signaling properties provides a way for EGFR to respond to different concentrations of the same ligand in qualitatively different ways.
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