Ferric Chelate Reductase 1 Like Protein (FRRS1L) Associates with Dynein Vesicles and Regulates Glutamatergic Synaptic Transmission.

Ferric Chelate Reductase 1 Like Protein (FRRS1L) Associates with Dynein Vesicles and Regulates Glutamatergic Synaptic Transmission.
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高铁螯合还原酶 1 样蛋白 (FRRS1L) 与动力蛋白囊泡结合并调节谷氨酸突触传递

DOI:
10.3389/fnmol.2017.00402
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发表时间:
2017
影响因子:
4.8
通讯作者:
Lu W
Lu W
中科院分区:
医学2区
文献类型:
--
作者:
Han W;Wang H;Li J;Zhang S;Lu W

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在脑中,AMPA受体(AMPAR)介导的兴奋性突触传递受受体辅助亚基的重要调节。最近的蛋白质组学研究已经确定,铁螯合物还原酶1样蛋白(FRRS 1 L),其在人类中的突变导致癫痫,舞蹈徐动症和认知缺陷,存在于大脑中的天然AMPAR复合物中。在这里,我们的特点FRRS 1 L在异源细胞和小鼠神经元。我们发现FRRS 1 L在HEK细胞中与AMPARs的GluA 1和GluA 2亚基相互作用,但不形成二聚体/低聚体。在小鼠海马神经元中,神经元表面的重组FRRS 1 L与GluA 1部分共定位,主要定位于非突触膜。此外,海马中的天然FRRS 1 L定位于动力蛋白囊泡,而不是驱动蛋白5 B囊泡。在功能上,FRRS 1 L在海马神经元中的过表达不改变海马能突触传递。相反,FRRS 1 L的单细胞敲除(KO)强烈降低神经元表面GluA 1亚基的表达水平,并显着降低小鼠海马锥体神经元中AMPAR介导的突触传递。两者合计,这些数据特征FRRS 1 L在异源细胞和神经元,并揭示了一个重要的作用,FRRS 1 L的兴奋性突触强度的调节。
In the brain, AMPA receptors (AMPARs)-mediated excitatory synaptic transmission is critically regulated by the receptor auxiliary subunits. Recent proteomic studies have identified that Ferric Chelate Reductase 1 Like protein (FRRS1L), whose mutations in human lead to epilepsy, choreoathetosis, and cognitive deficits, is present in native AMPAR complexes in the brain. Here we have characterized FRRS1L in both heterologous cells and in mouse neurons. We found that FRRS1L interacts with both GluA1 and GluA2 subunits of AMPARs, but does not form dimers/oligomers, in HEK cells. In mouse hippocampal neurons, recombinant FRRS1L at the neuronal surface partially co-localizes with GluA1 and primarily localizes at non-synaptic membranes. In addition, native FRRS1L in hippocampus is localized at dynein, but not kinesin5B, vesicles. Functionally, over-expression of FRRS1L in hippocampal neurons does not change glutamatergic synaptic transmission. In contrast, single-cell knockout (KO) of FRRS1L strongly reduces the expression levels of the GluA1 subunit at the neuronal surface, and significantly decreases AMPAR-mediated synaptic transmission in mouse hippocampal pyramidal neurons. Taken together, these data characterize FRRS1L in heterologous cells and neurons, and reveal an important role of FRRS1L in the regulation of excitatory synaptic strength.
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