Endocytic Adaptor Protein HIP1R Controls Intracellular Trafficking of Epidermal Growth Factor Receptor in Neuronal Dendritic Development

Endocytic Adaptor Protein HIP1R Controls Intracellular Trafficking of Epidermal Growth Factor Receptor in Neuronal Dendritic Development
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内吞接头蛋白 HIP1R 控制神经元树突发育中表皮生长因子受体的细胞内运输

DOI:
10.3389/fnmol.2018.00447
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发表时间:
2018-12
期刊:
Front Mol Neurosci
影响因子:
--
通讯作者:
Junyu Xu
Junyu Xu
中科院分区:
其他
文献类型:
--
作者:
Yang Qian;Peng Lin;Wu Y;Li Yi;Wang L;Jianhong Luo;Junyu Xu

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亨廷顿相互作用蛋白1相关蛋白(HIP 1 R)是根据其与HIP 1的结构同源性鉴定的。基于其结构域结构,HIP 1 R是一种推定的内吞相关蛋白。我们以前的研究表明,敲低HIP 1 R诱导培养的大鼠海马神经元树突生长和分支的显着减少。然而,其潜在机制仍有待阐明。在这项研究中,我们发现,敲低HIP 1 R削弱了激活的表皮生长因子受体(EGFR)的内吞作用,从而激活下游ERK和Akt蛋白。同时,它还能阻断EGF诱导的树突状生长。我们还表明,HIP 1 R片段,氨基酸633-822(HIP 1 R633 -822),与EGFR相互作用,并揭示了一个显性的负面影响,破坏HIP 1 R-EGFR相互作用介导的神经元发育。总的来说,这些结果揭示了一种新的机制,即HIP 1 R通过介导EGFR的内吞作用和下游信号传导在培养的海马神经元的轴突起始和树突分支中起关键作用。
Huntington-interacting protein 1-related protein (HIP1R) was identified on the basis of its structural homology with HIP1. Based on its domain structure, HIP1R is a putative endocytosis-related protein. Our previous study had shown that knockdown of HIP1R induces a dramatic decrease of dendritic growth and branching in cultured rat hippocampal neurons. However, the underlying mechanism remains elucidative. In this study, we found that knockdown of HIP1R impaired the endocytosis of activated epidermal growth factor receptor (EGFR) and the consequent activation of the downstream ERK and Akt proteins. Meanwhile, it blocked the EGF-induced dendritic outgrowth. We also showed that the HIP1R fragment, amino acids 633–822 (HIP1R633–822), interacted with EGFR and revealed a dominant negative effect in disrupting the HIP1R-EGFR interaction-mediated neuronal development. Collectively, these results reveal a novel mechanism that HIP1R plays a critical role in neurite initiation and dendritic branching in cultured hippocampal neurons via mediating the endocytosis of EGFR and downstream signaling.
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