Coexpressed Auxiliary Subunits Exhibit Distinct Modulatory Profiles on AMPA Receptor Function
Copyright policy )Coexpressed Auxiliary Subunits Exhibit Distinct Modulatory Profiles on AMPA Receptor Function
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.
physiology [Excitatory Postsynaptic Potentials], Patch-Clamp Techniques, Neuroscience(all), Nerve Tissue Proteins, genetics [Neuronal Plasticity], Synaptic Transmission, Gene Knockout Techniques, Mice, methods [Patch-Clamp Techniques], physiology [Neuronal Plasticity], Animals, Humans, Receptors, AMPA, Neurons, metabolism [Nerve Tissue Proteins], CKAMP44 protein, mouse, Neuronal Plasticity, metabolism [Receptors, AMPA], metabolism [Calcium Channels], Excitatory Postsynaptic Potentials, Membrane Proteins, metabolism [Dentate Gyrus], physiology [Neurons], metabolism [Neurons], physiology [Synaptic Transmission], Dentate Gyrus, Synapses, genetics [Receptors, AMPA], Calcium Channels, physiology [Synapses], metabolism [Membrane Proteins], TARP gamma-8 protein, mouse, ddc: ddc:610
physiology [Excitatory Postsynaptic Potentials], Patch-Clamp Techniques, Neuroscience(all), Nerve Tissue Proteins, genetics [Neuronal Plasticity], Synaptic Transmission, Gene Knockout Techniques, Mice, methods [Patch-Clamp Techniques], physiology [Neuronal Plasticity], Animals, Humans, Receptors, AMPA, Neurons, metabolism [Nerve Tissue Proteins], CKAMP44 protein, mouse, Neuronal Plasticity, metabolism [Receptors, AMPA], metabolism [Calcium Channels], Excitatory Postsynaptic Potentials, Membrane Proteins, metabolism [Dentate Gyrus], physiology [Neurons], metabolism [Neurons], physiology [Synaptic Transmission], Dentate Gyrus, Synapses, genetics [Receptors, AMPA], Calcium Channels, physiology [Synapses], metabolism [Membrane Proteins], TARP gamma-8 protein, mouse, ddc: ddc:610
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