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Coexpressed Auxiliary Subunits Exhibit Distinct Modulatory Profiles on AMPA Receptor Function

机译:共表达的辅助亚基在AMPA受体功能上表现出不同的调制模式。

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摘要

Gating properties and surface trafficking of AMPA receptors (AMPARs) are modulated by auxiliary subunits. Here we studied the function of coexpressed auxiliary subunits belonging to two different classes. We focused on TARP γ-8 and CKAMP44 in dentate gyrus (DG) granule cells, since both subunits are highly expressed in this cell type. TARP γ-8 and CKAMP44 decrease the rate of deactivation but have an opposing influence on receptor desensitization, which accounts for their differential modulation of synaptic short-term plasticity. Furthermore, long-term plasticity (LTP) requires TARP γ-8 but not CKAMP44. The coexpression of both auxiliary subunits is necessary for the efficient targeting of AMPARs to the cell surface of DG granule cells. Finally, electrophysiological and biochemical evidence support the notion that CKAMP44 and TARP γ-8 can be contained in the same AMPAR complex.
机译:辅助亚基调节AMPA受体(AMPAR)的门控特性和表面运输。在这里,我们研究了属于两个不同类别的共表达辅助亚基的功能。我们专注于齿状回(DG)颗粒细胞中的TARPγ-8和CKAMP44,因为这两个亚基都在这种细胞类型中高度表达。 TARPγ-8和CKAMP44降低了失活的速率,但对受体脱敏有相反的影响,这说明了它们对突触短期可塑性的不同调节。此外,长期可塑性(LTP)需要TARPγ-8,而不需要CKAMP44。这两个辅助亚基的共表达是有效将AMPAR靶向DG颗粒细胞的细胞表面所必需的。最后,电生理和生化证据支持CKAMP44和TARPγ-8可以包含在同一AMPAR复合物中的观点。

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