Abstract
Hippocampal mossy fiber synapses show an unusual form of long-term potentiation (LTP) that is independent of NMDA receptor activation and is expressed presynaptically. Using receptor antagonists, as well as receptor knockout mice, we found that presynaptic kainate receptors facilitate the induction of mossy fiber long-term potentiation (LTP), although they are not required for this form of LTP. Most importantly, these receptors impart an associativity to mossy fiber LTP such that activity in neighboring mossy fiber synapses, or even associational/commissural synapses, influences the threshold for inducing mossy fiber LTP. Such a mechanism greatly increases the computational power of this form of plasticity.
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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Animals
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Electric Stimulation
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Excitatory Amino Acid Antagonists / pharmacology
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Excitatory Postsynaptic Potentials / drug effects
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Excitatory Postsynaptic Potentials / physiology
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GluK2 Kainate Receptor
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Long-Term Potentiation / drug effects
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Long-Term Potentiation / physiology*
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Mice
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Mice, Knockout
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Mossy Fibers, Hippocampal / drug effects
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Mossy Fibers, Hippocampal / physiology*
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Neural Pathways / drug effects
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Neural Pathways / physiology
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Organ Culture Techniques
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Potassium / metabolism
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Potassium / pharmacology
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Presynaptic Terminals / physiology*
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Rats
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Rats, Sprague-Dawley
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Receptors, Kainic Acid / antagonists & inhibitors
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Receptors, Kainic Acid / deficiency*
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Receptors, Kainic Acid / genetics
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Synaptic Transmission / drug effects
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Synaptic Transmission / physiology*
Substances
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Excitatory Amino Acid Antagonists
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Receptors, Kainic Acid
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Potassium