Differential redistribution of native AMPA receptor complexes following LTD induction in acute hippocampal slices.
AMPAR trafficking is crucial for the expression of certain forms of synaptic plasticity. Here, using surface biotinylation of hippocampal slices and subsequent synaptosome isolation we assessed AMPAR surface expression in synaptosomes following NMDA-evoked long-term depression (NMDA-LTD). Surface levels of GluR1, GluR2 and GluR3 in synaptosomes were markedly reduced 90 min after NMDA-LTD induction. Consistent with endocytosis and degradation, whole-cell surface and total expression levels of GluR2 and GluR3 were also reduced. In contrast, whole-cell surface levels of GluR1 were unaltered at 90 min suggesting that AMPARs with different subunit composition are redistributed to different non-synaptic compartments following LTD induction in acute hippocampal slices.
Holman
David
D
MRC Centre for Synaptic Plasticity, Department of Anatomy, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, UK.
Feligioni
Marco
M
Henley
Jeremy M
JM
D000818:Animals; D000831:Animals, Newborn; D015153:Blotting, Western; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D000076122:Disks Large Homolog 4 Protein; D004307:Dose-Response Relationship, Radiation; D004558:Electric Stimulation / Q000379:methods; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D006624:Hippocampus / Q000166:cytology / Q000378:metabolism* / Q000528:radiation effects; D066298:In Vitro Techniques; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism / Q000528:radiation effects; D036881:Long-Term Synaptic Depression / Q000187:drug effects / Q000502:physiology*; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism / Q000528:radiation effects; D016202:N-Methylaspartate / Q000494:pharmacology; D009473:Neuronal Plasticity / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D021381:Protein Transport / Q000187:drug effects / Q000528:radiation effects; D051381:Rats; D017208:Rats, Wistar; D018091:Receptors, AMPA / Q000378:metabolism*; D013574:Synaptosomes / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D014404:Tubulin / Q000378:metabolism
D000076122:Disks Large Homolog 4 Protein; C501449:Dlg4 protein, rat; D018690:Excitatory Amino Acid Agonists; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D018091:Receptors, AMPA; D014404:Tubulin; D016202:N-Methylaspartate