Spred2 interaction with the late endosomal protein NBR1 down-regulates fibroblast growth factor receptor signaling.

Spred2 interaction with the late endosomal protein NBR1 down-regulates fibroblast growth factor receptor signaling.
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Spred2 与晚期内体蛋白 NBR1 的相互作用下调成纤维细胞生长因子受体信号传导。

DOI:
10.1083/jcb.200905118
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发表时间:
2009-10-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Heath JK
Heath JK
中科院分区:
其他
文献类型:
--
作者:
Mardakheh FK;Yekezare M;Machesky LM;Heath JK

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BRCA1 (NBR1) 的邻居通过将激活的受体重定向至溶酶体进行降解来抑制生长因子反应。通过受体内吞运输调节生长因子信号传导的潜力已得到广泛认可,但其潜在机制却知之甚少。我们检查了与 EVH1(Ena/VASP 同源 1)结构域(Spred)相关的 Sprouty 对成纤维细胞生长因子(FGF)信号传导的调节,Spred 是一个具有肿瘤抑制功能的信号传导抑制剂家族。 Spreds 的抑制活性与其 N 末端 EVH1 结构域有关,但分子机制尚不清楚。在这项研究中,我们鉴定了一种直接与 Spred2 的 EVH1 结构域结合的新型晚期内体蛋白。 BRCA1 的邻居 (NBR1) 是一种高度保守的多域蛋白,在体内与 Spred2 相互作用并共定位。 Spred2 对 FGF 信号传导的减弱取决于与 NBR1 的相互作用,并且是通过将激活的受体的运输重定向至溶酶体降解途径来实现的。我们的研究结果表明 NBR1 在受体运输调节中发挥着关键作用,并提供了一种通过 NBR1 下调 Spred2 信号传导的机制。
Neighbor of BRCA1 (NBR1) suppresses growth factor responses by redirecting activated receptors to lysosomes for degradation. The potential for modulation of growth factor signaling by endocytic trafficking of receptors is well recognized, but the underlying mechanisms are poorly understood. We examined the regulation of fibroblast growth factor (FGF) signaling by Sprouty related with EVH1 (Ena/VASP homology 1) domain (Spred), a family of signaling inhibitors with proposed tumor-suppressive functions. The inhibitory activity of Spreds has been linked to their N-terminal EVH1 domain, but the molecular mechanism is unknown. In this study, we identify a novel late endosomal protein that directly binds to the EVH1 domain of Spred2. Neighbor of BRCA1 (NBR1) is a highly conserved multidomain protein that interacts and colocalizes with Spred2 in vivo. Attenuation of FGF signaling by Spred2 is dependent on the interaction with NBR1 and is achieved by redirecting the trafficking of activated receptors to the lysosomal degradation pathway. Our findings suggest a critical function for NBR1 in the regulation of receptor trafficking and provide a mechanism for down-regulation of signaling by Spred2 via NBR1.
SPRSED-1负调节过敏原诱导的气道嗜酸性粒细胞和反应性过高。
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