Abstract
Regulation of AMPA receptor (AMPAR) trafficking is important for neural plasticity. Here we examined the trafficking and synthesis of the GluR1 and GluR2 subunits using ReAsH-EDT(2) and FlAsH-EDT(2) staining. Activity blockade of rat cultured neurons increased dendritic GluR1, but not GluR2, levels. Examination of transected dendrites revealed that both AMPAR subunits were synthesized in dendrites and that activity blockade enhanced dendritic synthesis of GluR1 but not GluR2. In contrast, acute pharmacological manipulations increased dendritic synthesis of both subunits. AMPARs synthesized in dendrites were inserted into synaptic plasma membranes and, after activity blockade, the electrophysiological properties of native synaptic AMPARs changed in the manner predicted by the imaging experiments. In addition to providing a novel mechanism for synaptic modifications, these results point out the advantages of using FlAsH-EDT(2) and ReAsH-EDT(2) for studying the trafficking of newly synthesized proteins in local cellular compartments such as dendrites.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Action Potentials / drug effects
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Action Potentials / genetics*
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Amino Acid Motifs / drug effects
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Amino Acid Motifs / physiology
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Animals
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Arsenicals
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Cells, Cultured
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Cysteine
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Dendrites / drug effects
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Dendrites / metabolism*
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Dendrites / ultrastructure
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Excitatory Amino Acid Antagonists / pharmacology
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Fetus
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Glutamic Acid / pharmacology
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Hippocampus / cytology
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Hippocampus / drug effects
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Hippocampus / metabolism
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Neuronal Plasticity / drug effects
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Neuronal Plasticity / genetics*
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Oxazines
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Peptide Fragments
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Protein Transport / physiology
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RNA, Messenger / drug effects
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RNA, Messenger / metabolism
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Rats
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Rats, Sprague-Dawley
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Receptors, AMPA / antagonists & inhibitors
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Receptors, AMPA / biosynthesis*
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Receptors, AMPA / genetics
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Synaptic Membranes / drug effects
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Synaptic Membranes / metabolism*
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Synaptic Membranes / ultrastructure
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Synaptic Transmission / drug effects
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Synaptic Transmission / genetics*
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Up-Regulation / physiology
Substances
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Arsenicals
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Excitatory Amino Acid Antagonists
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Oxazines
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Peptide Fragments
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RNA, Messenger
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ReAsH-EDT2 compound
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Receptors, AMPA
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Glutamic Acid
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Cysteine
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glutamate receptor ionotropic, AMPA 2
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glutamate receptor ionotropic, AMPA 1