GSK3 and KIF5 regulate activity-dependent sorting of gephyrin between axons and dendrites.

GSK3 and KIF5 regulate activity-dependent sorting of gephyrin between axons and dendrites.
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GSK3 和 KIF5 调节轴突和树突之间 gephyrin 的活性依赖性排序

DOI:
10.1016/j.ejcb.2015.01.005
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发表时间:
2015
影响因子:
6.6
通讯作者:
Kneussel M
Kneussel M
中科院分区:
生物学3区
文献类型:
--
作者:
Rathgeber L;Gromova KV;Schaefer I;Breiden P;Lohr C;Kneussel M

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运动蛋白KIF5将神经元货物运输到轴突和树突。分离的KIF5运动结构域优先移动到轴突,然而KIF5结合GRIP1或gephyrin驱动马达进入树突,分别递送AMPA受体(AMPARs)或甘氨酸受体(GlyRs)。在突触后位点,gephyrin形成多聚体支架,锚定GlyRs和gabaar受体(GABAARs),与抑制性突触前末端相对立。在这里,我们报告了意想不到的观察结果,通过慢性激活AMPARs增加细胞内钙,将新合成的gephyrin融合蛋白(西红柿-gephyrin)引导到轴突,并干扰其正常递送到培养神经元的树突。轴突卟啉簇不与突触前终末相对立,而是与GlyRs和NLG2共定位。值得注意的是,糖原合成酶激酶3 (GSK3)和KIF5的功能阻断使格菲林在轴突间室中的错误分选正常化。相比之下,GSK3靶点gephyrin S270的突变对轴向树突分选没有贡献。我们的数据与先前的观察结果一致,后者报告了通过GSK3活性调节运动蛋白的运动。他们认为GSK3以kif5依赖的方式调节GlyR/gephyrin和NLG2复合物的分选。
The kinesin KIF5 transports neuronal cargoes into axons and dendrites. Isolated KIF5 motor domains preferentially move into axons, however KIF5 binding to GRIP1 or gephyrin drives the motor into dendrites, to deliver AMPA receptors (AMPARs) or glycine receptors (GlyRs), respectively. At postsynaptic sites, gephyrin forms a multimeric scaffold to anchor GlyRs and GABAAreceptors (GABAARs) in apposition to inhibitory presynaptic terminals. Here, we report the unexpected observation that increased intracellular calcium through chronic activation of AMPARs, steers a newly synthesized gephyrin fusion protein (tomato-gephyrin) to axons and interferes with its normal delivery into dendrites of cultured neurons. Axonal gephyrin clusters were not apposed to presynaptic terminals, but colocalized with GlyRs and neuroligin-2 (NLG2). Notably, functional blockade of glycogen synthase kinase-3 (GSK3) and KIF5 normalized gephyrin missorting into the axonal compartment. In contrast, mutagenesis of gephyrin S270, a GSK3 target, did not contribute to axo-dendritic sorting. Our data are consistent with previous observations, which report regulation of kinesin motility through GSK3 activity. They suggest that GSK3 regulates the sorting of GlyR/gephyrin and NLG2 complexes in a KIF5-dependent manner.
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