Evidence of calcium-permeable AMPA receptors in dendritic spines of CA1 pyramidal neurons
Identifieur interne : 000310 ( Ncbi/Merge ); précédent : 000309; suivant : 000311Evidence of calcium-permeable AMPA receptors in dendritic spines of CA1 pyramidal neurons
Auteurs : Hayley A. Mattison [États-Unis] ; Ashish A. Bagal [États-Unis] ; Michael Mohammadi [États-Unis] ; Nisha S. Pulimood [États-Unis] ; Christian G. Reich [États-Unis] ; Bradley E. Alger [États-Unis] ; Joseph P. Y. Kao [États-Unis] ; Scott M. Thompson [États-Unis]Source :
- Journal of Neurophysiology [ 0022-3077 ] ; 2014.
Descripteurs français
- KwdFr :
- Acide glutamique (pharmacologie), Animaux, Calcium (métabolisme), Cellules pyramidales (), Cellules pyramidales (métabolisme), Cellules pyramidales (physiologie), Cobalt (pharmacologie), Mâle, Polyamines (pharmacologie), Potentiels post-synaptiques excitateurs, Rat Sprague-Dawley, Rats, Récepteur de l'AMPA (métabolisme), Région CA1 de l'hippocampe (cytologie), Région CA1 de l'hippocampe (métabolisme), Région CA1 de l'hippocampe (physiologie), Spermine (pharmacologie), Synapses (métabolisme), Synapses (physiologie), Épines dendritiques (métabolisme), Épines dendritiques (physiologie).
- MESH :
- cytologie : Région CA1 de l'hippocampe.
- métabolisme : Calcium, Cellules pyramidales, Récepteur de l'AMPA, Région CA1 de l'hippocampe, Synapses, Épines dendritiques.
- pharmacologie : Acide glutamique, Cobalt, Polyamines, Spermine.
- physiologie : Cellules pyramidales, Région CA1 de l'hippocampe, Synapses, Épines dendritiques.
- Animaux, Cellules pyramidales, Mâle, Potentiels post-synaptiques excitateurs, Rat Sprague-Dawley, Rats.
English descriptors
- KwdEn :
- Animals, CA1 Region, Hippocampal (cytology), CA1 Region, Hippocampal (metabolism), CA1 Region, Hippocampal (physiology), Calcium (metabolism), Cobalt (pharmacology), Dendritic Spines (metabolism), Dendritic Spines (physiology), Excitatory Postsynaptic Potentials, Glutamic Acid (pharmacology), Male, Polyamines (pharmacology), Pyramidal Cells (drug effects), Pyramidal Cells (metabolism), Pyramidal Cells (physiology), Rats, Rats, Sprague-Dawley, Receptors, AMPA (metabolism), Spermine (pharmacology), Synapses (metabolism), Synapses (physiology).
- MESH :
- chemical , metabolism : Calcium, Receptors, AMPA.
- cytology : CA1 Region, Hippocampal.
- drug effects : Pyramidal Cells.
- metabolism : CA1 Region, Hippocampal, Dendritic Spines, Pyramidal Cells, Synapses.
- chemical , pharmacology : Cobalt, Glutamic Acid, Polyamines, Spermine.
- physiology : CA1 Region, Hippocampal, Dendritic Spines, Pyramidal Cells, Synapses.
- Animals, Excitatory Postsynaptic Potentials, Male, Rats, Rats, Sprague-Dawley.
Abstract
GluA2-lacking, calcium-permeable α-amino-3-hydroxy-5-methylisoxazole-4-propionate receptors (AMPARs) have unique properties, but their presence at excitatory synapses in pyramidal cells is controversial. We have tested certain predictions of the model that such receptors are present in CA1 cells and show here that the polyamine spermine, but not philanthotoxin, causes use-dependent inhibition of synaptically evoked excitatory responses in stratum radiatum, but not s. oriens, in cultured and acute hippocampal slices. Stimulation of single dendritic spines by photolytic release of caged glutamate induced an
Url:
DOI: 10.1152/jn.00578.2013
PubMed: 24760782
PubMed Central: 4064414
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PMC:4064414Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals</term>
<term>CA1 Region, Hippocampal (cytology)</term>
<term>CA1 Region, Hippocampal (metabolism)</term>
<term>CA1 Region, Hippocampal (physiology)</term>
<term>Calcium (metabolism)</term>
<term>Cobalt (pharmacology)</term>
<term>Dendritic Spines (metabolism)</term>
<term>Dendritic Spines (physiology)</term>
<term>Excitatory Postsynaptic Potentials</term>
<term>Glutamic Acid (pharmacology)</term>
<term>Male</term>
<term>Polyamines (pharmacology)</term>
<term>Pyramidal Cells (drug effects)</term>
<term>Pyramidal Cells (metabolism)</term>
<term>Pyramidal Cells (physiology)</term>
<term>Rats</term>
<term>Rats, Sprague-Dawley</term>
<term>Receptors, AMPA (metabolism)</term>
<term>Spermine (pharmacology)</term>
<term>Synapses (metabolism)</term>
<term>Synapses (physiology)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Acide glutamique (pharmacologie)</term>
<term>Animaux</term>
<term>Calcium (métabolisme)</term>
<term>Cellules pyramidales ()</term>
<term>Cellules pyramidales (métabolisme)</term>
<term>Cellules pyramidales (physiologie)</term>
<term>Cobalt (pharmacologie)</term>
<term>Mâle</term>
<term>Polyamines (pharmacologie)</term>
<term>Potentiels post-synaptiques excitateurs</term>
<term>Rat Sprague-Dawley</term>
<term>Rats</term>
<term>Récepteur de l'AMPA (métabolisme)</term>
<term>Région CA1 de l'hippocampe (cytologie)</term>
<term>Région CA1 de l'hippocampe (métabolisme)</term>
<term>Région CA1 de l'hippocampe (physiologie)</term>
<term>Spermine (pharmacologie)</term>
<term>Synapses (métabolisme)</term>
<term>Synapses (physiologie)</term>
<term>Épines dendritiques (métabolisme)</term>
<term>Épines dendritiques (physiologie)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Calcium</term>
<term>Receptors, AMPA</term>
</keywords>
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</keywords>
<keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Pyramidal Cells</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>CA1 Region, Hippocampal</term>
<term>Dendritic Spines</term>
<term>Pyramidal Cells</term>
<term>Synapses</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Calcium</term>
<term>Cellules pyramidales</term>
<term>Récepteur de l'AMPA</term>
<term>Région CA1 de l'hippocampe</term>
<term>Synapses</term>
<term>Épines dendritiques</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>Acide glutamique</term>
<term>Cobalt</term>
<term>Polyamines</term>
<term>Spermine</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Cobalt</term>
<term>Glutamic Acid</term>
<term>Polyamines</term>
<term>Spermine</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Cellules pyramidales</term>
<term>Région CA1 de l'hippocampe</term>
<term>Synapses</term>
<term>Épines dendritiques</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>CA1 Region, Hippocampal</term>
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<term>Pyramidal Cells</term>
<term>Synapses</term>
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<term>Excitatory Postsynaptic Potentials</term>
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<term>Rats, Sprague-Dawley</term>
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<term>Cellules pyramidales</term>
<term>Mâle</term>
<term>Potentiels post-synaptiques excitateurs</term>
<term>Rat Sprague-Dawley</term>
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<front><div type="abstract" xml:lang="en"><p>GluA2-lacking, calcium-permeable α-amino-3-hydroxy-5-methylisoxazole-4-propionate receptors (AMPARs) have unique properties, but their presence at excitatory synapses in pyramidal cells is controversial. We have tested certain predictions of the model that such receptors are present in CA1 cells and show here that the polyamine spermine, but not philanthotoxin, causes use-dependent inhibition of synaptically evoked excitatory responses in stratum radiatum, but not s. oriens, in cultured and acute hippocampal slices. Stimulation of single dendritic spines by photolytic release of caged glutamate induced an <italic>N</italic>
-methyl-<sc>d</sc>
-aspartate receptor-independent, use- and spermine-sensitive calcium influx only at apical spines in cultured slices. Bath application of glutamate also triggered a spermine-sensitive influx of cobalt into CA1 cell dendrites in s. radiatum. Responses of single apical, but not basal, spines to photostimulation displayed prominent paired-pulse facilitation (PPF) consistent with use-dependent relief of cytoplasmic polyamine block. Responses at apical dendrites were diminished, and PPF was increased, by spermine. Intracellular application of pep2m, which inhibits recycling of GluA2-containing AMPARs, reduced apical spine responses and increased PPF. We conclude that some calcium-permeable, polyamine-sensitive AMPARs, perhaps lacking GluA2 subunits, are present at synapses on apical dendrites of CA1 pyramidal cells, which may allow distinct forms of synaptic plasticity and computation at different sets of excitatory inputs.</p>
</div>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Evidence of calcium-permeable AMPA receptors in dendritic spines of CA1 pyramidal neurons</title>
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<placeName><region type="state">Maryland</region>
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<placeName><region type="state">Maryland</region>
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<author><name sortKey="Bagal, Ashish A" sort="Bagal, Ashish A" uniqKey="Bagal A" first="Ashish A." last="Bagal">Ashish A. Bagal</name>
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<author><name sortKey="Mohammadi, Michael" sort="Mohammadi, Michael" uniqKey="Mohammadi M" first="Michael" last="Mohammadi">Michael Mohammadi</name>
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<placeName><region type="state">Maryland</region>
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<author><name sortKey="Pulimood, Nisha S" sort="Pulimood, Nisha S" uniqKey="Pulimood N" first="Nisha S." last="Pulimood">Nisha S. Pulimood</name>
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<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Department of Physiology, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
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<affiliation wicri:level="2"><nlm:aff wicri:cut="; and" id="aff3">Program in Neuroscience, University of Maryland School of Medicine, Baltimore, Maryland</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
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<author><name sortKey="Reich, Christian G" sort="Reich, Christian G" uniqKey="Reich C" first="Christian G." last="Reich">Christian G. Reich</name>
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<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Department of Physiology, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
</author>
<author><name sortKey="Alger, Bradley E" sort="Alger, Bradley E" uniqKey="Alger B" first="Bradley E." last="Alger">Bradley E. Alger</name>
<affiliation wicri:level="2"><nlm:aff id="aff1">Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland;</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Department of Physiology, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
<affiliation wicri:level="2"><nlm:aff id="aff2">Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore, Maryland;</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
</author>
<author><name sortKey="Kao, Joseph P Y" sort="Kao, Joseph P Y" uniqKey="Kao J" first="Joseph P. Y." last="Kao">Joseph P. Y. Kao</name>
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<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
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</affiliation>
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<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
<affiliation wicri:level="2"><nlm:aff id="aff4">Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, Maryland</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
</author>
<author><name sortKey="Thompson, Scott M" sort="Thompson, Scott M" uniqKey="Thompson S" first="Scott M." last="Thompson">Scott M. Thompson</name>
<affiliation wicri:level="2"><nlm:aff id="aff1">Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland;</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Department of Physiology, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
<affiliation wicri:level="2"><nlm:aff id="aff2">Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore, Maryland;</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
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</analytic>
<series><title level="j">Journal of Neurophysiology</title>
<idno type="ISSN">0022-3077</idno>
<idno type="eISSN">1522-1598</idno>
<imprint><date when="2014">2014</date>
</imprint>
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<front><div type="abstract" xml:lang="en"><p>GluA2-lacking, calcium-permeable α-amino-3-hydroxy-5-methylisoxazole-4-propionate receptors (AMPARs) have unique properties, but their presence at excitatory synapses in pyramidal cells is controversial. We have tested certain predictions of the model that such receptors are present in CA1 cells and show here that the polyamine spermine, but not philanthotoxin, causes use-dependent inhibition of synaptically evoked excitatory responses in stratum radiatum, but not s. oriens, in cultured and acute hippocampal slices. Stimulation of single dendritic spines by photolytic release of caged glutamate induced an <italic>N</italic>
-methyl-<sc>d</sc>
-aspartate receptor-independent, use- and spermine-sensitive calcium influx only at apical spines in cultured slices. Bath application of glutamate also triggered a spermine-sensitive influx of cobalt into CA1 cell dendrites in s. radiatum. Responses of single apical, but not basal, spines to photostimulation displayed prominent paired-pulse facilitation (PPF) consistent with use-dependent relief of cytoplasmic polyamine block. Responses at apical dendrites were diminished, and PPF was increased, by spermine. Intracellular application of pep2m, which inhibits recycling of GluA2-containing AMPARs, reduced apical spine responses and increased PPF. We conclude that some calcium-permeable, polyamine-sensitive AMPARs, perhaps lacking GluA2 subunits, are present at synapses on apical dendrites of CA1 pyramidal cells, which may allow distinct forms of synaptic plasticity and computation at different sets of excitatory inputs.</p>
</div>
</front>
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<pubmed><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Evidence of calcium-permeable AMPA receptors in dendritic spines of CA1 pyramidal neurons.</title>
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<placeName><region type="state">Maryland</region>
</placeName>
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</affiliation>
</author>
<author><name sortKey="Bagal, Ashish A" sort="Bagal, Ashish A" uniqKey="Bagal A" first="Ashish A" last="Bagal">Ashish A. Bagal</name>
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</placeName>
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</affiliation>
</author>
<author><name sortKey="Mohammadi, Michael" sort="Mohammadi, Michael" uniqKey="Mohammadi M" first="Michael" last="Mohammadi">Michael Mohammadi</name>
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<placeName><region type="state">Maryland</region>
</placeName>
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</affiliation>
</author>
<author><name sortKey="Pulimood, Nisha S" sort="Pulimood, Nisha S" uniqKey="Pulimood N" first="Nisha S" last="Pulimood">Nisha S. Pulimood</name>
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</affiliation>
</author>
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</placeName>
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</affiliation>
</author>
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<placeName><region type="state">Maryland</region>
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</author>
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<country xml:lang="fr">États-Unis</country>
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</author>
<author><name sortKey="Thompson, Scott M" sort="Thompson, Scott M" uniqKey="Thompson S" first="Scott M" last="Thompson">Scott M. Thompson</name>
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<placeName><settlement type="city">Baltimore</settlement>
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<placeName><region type="state">Maryland</region>
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<author><name sortKey="Bagal, Ashish A" sort="Bagal, Ashish A" uniqKey="Bagal A" first="Ashish A" last="Bagal">Ashish A. Bagal</name>
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<placeName><region type="state">Maryland</region>
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<author><name sortKey="Alger, Bradley E" sort="Alger, Bradley E" uniqKey="Alger B" first="Bradley E" last="Alger">Bradley E. Alger</name>
<affiliation wicri:level="2"><nlm:affiliation>Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland; Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore, Maryland;</nlm:affiliation>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland; Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
</author>
<author><name sortKey="Kao, Joseph P Y" sort="Kao, Joseph P Y" uniqKey="Kao J" first="Joseph P Y" last="Kao">Joseph P Y. Kao</name>
<affiliation wicri:level="2"><nlm:affiliation>Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland; Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore, Maryland; Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, Maryland.</nlm:affiliation>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Maryland</region>
</placeName>
<wicri:cityArea>Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland; Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore, Maryland; Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore</wicri:cityArea>
</affiliation>
</author>
<author><name sortKey="Thompson, Scott M" sort="Thompson, Scott M" uniqKey="Thompson S" first="Scott M" last="Thompson">Scott M. Thompson</name>
<affiliation wicri:level="3"><nlm:affiliation>Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland; Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore, Maryland; sthom003@umaryland.edu.</nlm:affiliation>
<country wicri:rule="url">États-Unis</country>
<wicri:regionArea>Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland; Membrane Biology Training Program, University of Maryland School of Medicine, Baltimore</wicri:regionArea>
<placeName><settlement type="city">Baltimore</settlement>
<region type="state">Maryland</region>
</placeName>
</affiliation>
</author>
</analytic>
<series><title level="j">Journal of neurophysiology</title>
<idno type="eISSN">1522-1598</idno>
<imprint><date when="2014" type="published">2014</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals</term>
<term>CA1 Region, Hippocampal (cytology)</term>
<term>CA1 Region, Hippocampal (metabolism)</term>
<term>CA1 Region, Hippocampal (physiology)</term>
<term>Calcium (metabolism)</term>
<term>Cobalt (pharmacology)</term>
<term>Dendritic Spines (metabolism)</term>
<term>Dendritic Spines (physiology)</term>
<term>Excitatory Postsynaptic Potentials</term>
<term>Glutamic Acid (pharmacology)</term>
<term>Male</term>
<term>Polyamines (pharmacology)</term>
<term>Pyramidal Cells (drug effects)</term>
<term>Pyramidal Cells (metabolism)</term>
<term>Pyramidal Cells (physiology)</term>
<term>Rats</term>
<term>Rats, Sprague-Dawley</term>
<term>Receptors, AMPA (metabolism)</term>
<term>Spermine (pharmacology)</term>
<term>Synapses (metabolism)</term>
<term>Synapses (physiology)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Acide glutamique (pharmacologie)</term>
<term>Animaux</term>
<term>Calcium (métabolisme)</term>
<term>Cellules pyramidales ()</term>
<term>Cellules pyramidales (métabolisme)</term>
<term>Cellules pyramidales (physiologie)</term>
<term>Cobalt (pharmacologie)</term>
<term>Mâle</term>
<term>Polyamines (pharmacologie)</term>
<term>Potentiels post-synaptiques excitateurs</term>
<term>Rat Sprague-Dawley</term>
<term>Rats</term>
<term>Récepteur de l'AMPA (métabolisme)</term>
<term>Région CA1 de l'hippocampe (cytologie)</term>
<term>Région CA1 de l'hippocampe (métabolisme)</term>
<term>Région CA1 de l'hippocampe (physiologie)</term>
<term>Spermine (pharmacologie)</term>
<term>Synapses (métabolisme)</term>
<term>Synapses (physiologie)</term>
<term>Épines dendritiques (métabolisme)</term>
<term>Épines dendritiques (physiologie)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Calcium</term>
<term>Receptors, AMPA</term>
</keywords>
<keywords scheme="MESH" qualifier="cytologie" xml:lang="fr"><term>Région CA1 de l'hippocampe</term>
</keywords>
<keywords scheme="MESH" qualifier="cytology" xml:lang="en"><term>CA1 Region, Hippocampal</term>
</keywords>
<keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Pyramidal Cells</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>CA1 Region, Hippocampal</term>
<term>Dendritic Spines</term>
<term>Pyramidal Cells</term>
<term>Synapses</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Calcium</term>
<term>Cellules pyramidales</term>
<term>Récepteur de l'AMPA</term>
<term>Région CA1 de l'hippocampe</term>
<term>Synapses</term>
<term>Épines dendritiques</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr"><term>Acide glutamique</term>
<term>Cobalt</term>
<term>Polyamines</term>
<term>Spermine</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Cobalt</term>
<term>Glutamic Acid</term>
<term>Polyamines</term>
<term>Spermine</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Cellules pyramidales</term>
<term>Région CA1 de l'hippocampe</term>
<term>Synapses</term>
<term>Épines dendritiques</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>CA1 Region, Hippocampal</term>
<term>Dendritic Spines</term>
<term>Pyramidal Cells</term>
<term>Synapses</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Animals</term>
<term>Excitatory Postsynaptic Potentials</term>
<term>Male</term>
<term>Rats</term>
<term>Rats, Sprague-Dawley</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Animaux</term>
<term>Cellules pyramidales</term>
<term>Mâle</term>
<term>Potentiels post-synaptiques excitateurs</term>
<term>Rat Sprague-Dawley</term>
<term>Rats</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">GluA2-lacking, calcium-permeable α-amino-3-hydroxy-5-methylisoxazole-4-propionate receptors (AMPARs) have unique properties, but their presence at excitatory synapses in pyramidal cells is controversial. We have tested certain predictions of the model that such receptors are present in CA1 cells and show here that the polyamine spermine, but not philanthotoxin, causes use-dependent inhibition of synaptically evoked excitatory responses in stratum radiatum, but not s. oriens, in cultured and acute hippocampal slices. Stimulation of single dendritic spines by photolytic release of caged glutamate induced an N-methyl-d-aspartate receptor-independent, use- and spermine-sensitive calcium influx only at apical spines in cultured slices. Bath application of glutamate also triggered a spermine-sensitive influx of cobalt into CA1 cell dendrites in s. radiatum. Responses of single apical, but not basal, spines to photostimulation displayed prominent paired-pulse facilitation (PPF) consistent with use-dependent relief of cytoplasmic polyamine block. Responses at apical dendrites were diminished, and PPF was increased, by spermine. Intracellular application of pep2m, which inhibits recycling of GluA2-containing AMPARs, reduced apical spine responses and increased PPF. We conclude that some calcium-permeable, polyamine-sensitive AMPARs, perhaps lacking GluA2 subunits, are present at synapses on apical dendrites of CA1 pyramidal cells, which may allow distinct forms of synaptic plasticity and computation at different sets of excitatory inputs.</div>
</front>
</TEI>
</pubmed>
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