Differing presynaptic contributions to LTP and associative learning in behaving mice

The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Noelia Madroñal [verfasserIn] Agnes Gruart [verfasserIn] José M Delgado-García [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2009

Schlagwörter:	Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms

Übergeordnetes Werk:	In: Frontiers in Behavioral Neuroscience - Frontiers Media S.A., 2008, 3(2009)
Übergeordnetes Werk:	volume:3 ; year:2009

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3389/neuro.08.007.2009

Katalog-ID:	DOAJ071593160

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allfields	10.3389/neuro.08.007.2009 doi (DE-627)DOAJ071593160 (DE-599)DOAJb3e036cdebf74f5f970772e95130ab38 DE-627 ger DE-627 rakwb eng RC321-571 Noelia Madroñal verfasserin aut Differing presynaptic contributions to LTP and associative learning in behaving mice 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse. Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms Neurosciences. Biological psychiatry. Neuropsychiatry Agnes Gruart verfasserin aut José M Delgado-García verfasserin aut In Frontiers in Behavioral Neuroscience Frontiers Media S.A., 2008 3(2009) (DE-627)579826392 (DE-600)2452960-6 16625153 nnns volume:3 year:2009 https://doi.org/10.3389/neuro.08.007.2009 kostenfrei https://doaj.org/article/b3e036cdebf74f5f970772e95130ab38 kostenfrei http://journal.frontiersin.org/Journal/10.3389/neuro.08.007.2009/full kostenfrei https://doaj.org/toc/1662-5153 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2009
spelling	10.3389/neuro.08.007.2009 doi (DE-627)DOAJ071593160 (DE-599)DOAJb3e036cdebf74f5f970772e95130ab38 DE-627 ger DE-627 rakwb eng RC321-571 Noelia Madroñal verfasserin aut Differing presynaptic contributions to LTP and associative learning in behaving mice 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse. Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms Neurosciences. Biological psychiatry. Neuropsychiatry Agnes Gruart verfasserin aut José M Delgado-García verfasserin aut In Frontiers in Behavioral Neuroscience Frontiers Media S.A., 2008 3(2009) (DE-627)579826392 (DE-600)2452960-6 16625153 nnns volume:3 year:2009 https://doi.org/10.3389/neuro.08.007.2009 kostenfrei https://doaj.org/article/b3e036cdebf74f5f970772e95130ab38 kostenfrei http://journal.frontiersin.org/Journal/10.3389/neuro.08.007.2009/full kostenfrei https://doaj.org/toc/1662-5153 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2009
allfields_unstemmed	10.3389/neuro.08.007.2009 doi (DE-627)DOAJ071593160 (DE-599)DOAJb3e036cdebf74f5f970772e95130ab38 DE-627 ger DE-627 rakwb eng RC321-571 Noelia Madroñal verfasserin aut Differing presynaptic contributions to LTP and associative learning in behaving mice 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse. Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms Neurosciences. Biological psychiatry. Neuropsychiatry Agnes Gruart verfasserin aut José M Delgado-García verfasserin aut In Frontiers in Behavioral Neuroscience Frontiers Media S.A., 2008 3(2009) (DE-627)579826392 (DE-600)2452960-6 16625153 nnns volume:3 year:2009 https://doi.org/10.3389/neuro.08.007.2009 kostenfrei https://doaj.org/article/b3e036cdebf74f5f970772e95130ab38 kostenfrei http://journal.frontiersin.org/Journal/10.3389/neuro.08.007.2009/full kostenfrei https://doaj.org/toc/1662-5153 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2009
allfieldsGer	10.3389/neuro.08.007.2009 doi (DE-627)DOAJ071593160 (DE-599)DOAJb3e036cdebf74f5f970772e95130ab38 DE-627 ger DE-627 rakwb eng RC321-571 Noelia Madroñal verfasserin aut Differing presynaptic contributions to LTP and associative learning in behaving mice 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse. Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms Neurosciences. Biological psychiatry. Neuropsychiatry Agnes Gruart verfasserin aut José M Delgado-García verfasserin aut In Frontiers in Behavioral Neuroscience Frontiers Media S.A., 2008 3(2009) (DE-627)579826392 (DE-600)2452960-6 16625153 nnns volume:3 year:2009 https://doi.org/10.3389/neuro.08.007.2009 kostenfrei https://doaj.org/article/b3e036cdebf74f5f970772e95130ab38 kostenfrei http://journal.frontiersin.org/Journal/10.3389/neuro.08.007.2009/full kostenfrei https://doaj.org/toc/1662-5153 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2009
allfieldsSound	10.3389/neuro.08.007.2009 doi (DE-627)DOAJ071593160 (DE-599)DOAJb3e036cdebf74f5f970772e95130ab38 DE-627 ger DE-627 rakwb eng RC321-571 Noelia Madroñal verfasserin aut Differing presynaptic contributions to LTP and associative learning in behaving mice 2009 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse. Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms Neurosciences. Biological psychiatry. Neuropsychiatry Agnes Gruart verfasserin aut José M Delgado-García verfasserin aut In Frontiers in Behavioral Neuroscience Frontiers Media S.A., 2008 3(2009) (DE-627)579826392 (DE-600)2452960-6 16625153 nnns volume:3 year:2009 https://doi.org/10.3389/neuro.08.007.2009 kostenfrei https://doaj.org/article/b3e036cdebf74f5f970772e95130ab38 kostenfrei http://journal.frontiersin.org/Journal/10.3389/neuro.08.007.2009/full kostenfrei https://doaj.org/toc/1662-5153 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 3 2009
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source	In Frontiers in Behavioral Neuroscience 3(2009) volume:3 year:2009
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topic_facet	Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms Neurosciences. Biological psychiatry. Neuropsychiatry
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authorswithroles_txt_mv	Noelia Madroñal @@aut@@ Agnes Gruart @@aut@@ José M Delgado-García @@aut@@
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callnumber-first	R - Medicine
author	Noelia Madroñal
spellingShingle	Noelia Madroñal misc RC321-571 misc Hippocampus misc Long-Term Potentiation misc Mice misc CA3-CA1 misc presynaptic mechanisms misc Neurosciences. Biological psychiatry. Neuropsychiatry Differing presynaptic contributions to LTP and associative learning in behaving mice
authorStr	Noelia Madroñal
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topic_title	RC321-571 Differing presynaptic contributions to LTP and associative learning in behaving mice Hippocampus Long-Term Potentiation Mice CA3-CA1 presynaptic mechanisms
topic	misc RC321-571 misc Hippocampus misc Long-Term Potentiation misc Mice misc CA3-CA1 misc presynaptic mechanisms misc Neurosciences. Biological psychiatry. Neuropsychiatry
topic_unstemmed	misc RC321-571 misc Hippocampus misc Long-Term Potentiation misc Mice misc CA3-CA1 misc presynaptic mechanisms misc Neurosciences. Biological psychiatry. Neuropsychiatry
topic_browse	misc RC321-571 misc Hippocampus misc Long-Term Potentiation misc Mice misc CA3-CA1 misc presynaptic mechanisms misc Neurosciences. Biological psychiatry. Neuropsychiatry
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title	Differing presynaptic contributions to LTP and associative learning in behaving mice
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title_full	Differing presynaptic contributions to LTP and associative learning in behaving mice
author_sort	Noelia Madroñal
journal	Frontiers in Behavioral Neuroscience
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author_browse	Noelia Madroñal Agnes Gruart José M Delgado-García
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title_sort	differing presynaptic contributions to ltp and associative learning in behaving mice
callnumber	RC321-571
title_auth	Differing presynaptic contributions to LTP and associative learning in behaving mice
abstract	The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse.
abstractGer	The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse.
abstract_unstemmed	The hippocampal CA3-CA1 synapse is an excellent experimental model for studying the interactions between short- and long-term plastic changes taking place following high-frequency stimulation (HFS) of Schaffer collaterals and during the acquisition and extinction of a classical eyeblink conditioning in behaving mice. Input/output curves and a full-range paired-pulse study enabled determining the optimal intensities and inter-stimulus intervals for evoking paired-pulse facilitation (PPF) or depression (PPD) at the CA3-CA1 synapse. Long-term potentiation (LTP) induced by HFS lasted ≈ 10 days. HFS-induced LTP evoked an initial depression of basal PPF. Recovery of PPF baseline values was a steady and progressive process lasting ≈ 20 days, i.e., longer than the total duration of the LTP. In a subsequent series of experiments, we checked whether PPF was affected similarly during activity-dependent synaptic changes. Animals were conditioned using a trace paradigm, with a tone as a conditioned stimulus (CS) and an electrical shock to the trigeminal nerve as an unconditioned stimulus (US). A pair of pulses (40 ms interval) was presented to the Schaffer collateral-commissural pathway to evoke field EPSPs (fEPSPs) during the CS-US interval. Basal PPF decreased steadily across conditioning sessions (i.e., in the opposite direction to that during LTP), reaching a minimum value during the 10th conditioning session. Thus, LTP and classical eyeblink conditioning share some presynaptic mechanisms, but with an opposite evolution. Furthermore, PPF and PPD might play a homeostatic role during long-term plastic changes at the CA3-CA1 synapse.
collection_details	GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700
title_short	Differing presynaptic contributions to LTP and associative learning in behaving mice
url	https://doi.org/10.3389/neuro.08.007.2009 https://doaj.org/article/b3e036cdebf74f5f970772e95130ab38 http://journal.frontiersin.org/Journal/10.3389/neuro.08.007.2009/full https://doaj.org/toc/1662-5153
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author2	Agnes Gruart José M Delgado-García
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doi_str	10.3389/neuro.08.007.2009
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up_date	2024-07-03T21:07:20.342Z
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Differing presynaptic contributions to LTP and associative learning in behaving mice

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