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Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome

We have previously demonstrated that activation of serotonin 5-HT(7) receptors (5-HT(7)R) reverses metabotropic glutamate receptor-mediated long term depression (mGluR-LTD) in the hippocampus of wild-type (WT) and Fmr1 Knockout (KO) mice, a model of Fragile X Syndrome (FXS) in which mGluR-LTD is abn...

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Autores principales: Costa, Lara, Sardone, Lara Maria, Bonaccorso, Carmela Maria, D’Antoni, Simona, Spatuzza, Michela, Gulisano, Walter, Tropea, Maria Rosaria, Puzzo, Daniela, Leopoldo, Marcello, Lacivita, Enza, Catania, Maria Vincenza, Ciranna, Lucia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6176069/
https://www.ncbi.nlm.nih.gov/pubmed/30333723
http://dx.doi.org/10.3389/fnmol.2018.00353
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author Costa, Lara
Sardone, Lara Maria
Bonaccorso, Carmela Maria
D’Antoni, Simona
Spatuzza, Michela
Gulisano, Walter
Tropea, Maria Rosaria
Puzzo, Daniela
Leopoldo, Marcello
Lacivita, Enza
Catania, Maria Vincenza
Ciranna, Lucia
author_facet Costa, Lara
Sardone, Lara Maria
Bonaccorso, Carmela Maria
D’Antoni, Simona
Spatuzza, Michela
Gulisano, Walter
Tropea, Maria Rosaria
Puzzo, Daniela
Leopoldo, Marcello
Lacivita, Enza
Catania, Maria Vincenza
Ciranna, Lucia
author_sort Costa, Lara
collection PubMed
description We have previously demonstrated that activation of serotonin 5-HT(7) receptors (5-HT(7)R) reverses metabotropic glutamate receptor-mediated long term depression (mGluR-LTD) in the hippocampus of wild-type (WT) and Fmr1 Knockout (KO) mice, a model of Fragile X Syndrome (FXS) in which mGluR-LTD is abnormally enhanced. Here, we have investigated intracellular mechanisms underlying the effect of 5-HT(7)R activation using patch clamp on hippocampal slices. Furthermore, we have tested whether in vivo administration of LP-211, a selective 5-HT(7)R agonist, can rescue learning and behavior in Fmr1 KO mice. In the presence of an adenylate cyclase blocker, mGluR-LTD was slightly enhanced in WT and therefore the difference between mGluR-LTD in WT and Fmr1 KO slices was no longer present. Conversely, activation of adenylate cyclase by either forskolin or Pituitary Adenylate Cyclase Activating Polypeptide (PACAP) completely reversed mGluR-LTD in WT and Fmr1 KO. 5-HT(7)R activation reversed mGluR-LTD in WT and corrected exaggerated mGluR-LTD in Fmr1 KO; this effect was abolished by blockade of either adenylate cyclase or protein kinase A (PKA). Exposure of hippocampal slices to LP-211 caused an increased phosphorylation of extracellular signal regulated kinase (ERK), an intracellular effector involved in mGluR-LTD, in WT mice. Conversely, this effect was barely detectable in Fmr1 KO mice, suggesting that 5-HT(7)R-mediated reversal of mGluR-LTD does not require ERK stimulation. Finally, an acute in vivo administration of LP-211 improved novel object recognition (NOR) performance in WT and Fmr1 KO mice and reduced stereotyped behavior in Fmr1 KO mice. Our results indicate that mGluR-LTD in WT and Fmr1 KO slices is bidirectionally modulated in conditions of either reduced or enhanced cAMP formation. Activation of 5-HT(7) receptors reverses mGluR-LTD by activation of the cAMP/PKA intracellular pathway. Importantly, a systemic administration of a 5-HT(7)R agonist to Fmr1 KO mice corrected learning deficits and repetitive behavior. We suggest that selective 5-HT(7)R agonists might become novel pharmacological tools for FXS therapy.
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spelling pubmed-61760692018-10-17 Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome Costa, Lara Sardone, Lara Maria Bonaccorso, Carmela Maria D’Antoni, Simona Spatuzza, Michela Gulisano, Walter Tropea, Maria Rosaria Puzzo, Daniela Leopoldo, Marcello Lacivita, Enza Catania, Maria Vincenza Ciranna, Lucia Front Mol Neurosci Neuroscience We have previously demonstrated that activation of serotonin 5-HT(7) receptors (5-HT(7)R) reverses metabotropic glutamate receptor-mediated long term depression (mGluR-LTD) in the hippocampus of wild-type (WT) and Fmr1 Knockout (KO) mice, a model of Fragile X Syndrome (FXS) in which mGluR-LTD is abnormally enhanced. Here, we have investigated intracellular mechanisms underlying the effect of 5-HT(7)R activation using patch clamp on hippocampal slices. Furthermore, we have tested whether in vivo administration of LP-211, a selective 5-HT(7)R agonist, can rescue learning and behavior in Fmr1 KO mice. In the presence of an adenylate cyclase blocker, mGluR-LTD was slightly enhanced in WT and therefore the difference between mGluR-LTD in WT and Fmr1 KO slices was no longer present. Conversely, activation of adenylate cyclase by either forskolin or Pituitary Adenylate Cyclase Activating Polypeptide (PACAP) completely reversed mGluR-LTD in WT and Fmr1 KO. 5-HT(7)R activation reversed mGluR-LTD in WT and corrected exaggerated mGluR-LTD in Fmr1 KO; this effect was abolished by blockade of either adenylate cyclase or protein kinase A (PKA). Exposure of hippocampal slices to LP-211 caused an increased phosphorylation of extracellular signal regulated kinase (ERK), an intracellular effector involved in mGluR-LTD, in WT mice. Conversely, this effect was barely detectable in Fmr1 KO mice, suggesting that 5-HT(7)R-mediated reversal of mGluR-LTD does not require ERK stimulation. Finally, an acute in vivo administration of LP-211 improved novel object recognition (NOR) performance in WT and Fmr1 KO mice and reduced stereotyped behavior in Fmr1 KO mice. Our results indicate that mGluR-LTD in WT and Fmr1 KO slices is bidirectionally modulated in conditions of either reduced or enhanced cAMP formation. Activation of 5-HT(7) receptors reverses mGluR-LTD by activation of the cAMP/PKA intracellular pathway. Importantly, a systemic administration of a 5-HT(7)R agonist to Fmr1 KO mice corrected learning deficits and repetitive behavior. We suggest that selective 5-HT(7)R agonists might become novel pharmacological tools for FXS therapy. Frontiers Media S.A. 2018-10-02 /pmc/articles/PMC6176069/ /pubmed/30333723 http://dx.doi.org/10.3389/fnmol.2018.00353 Text en Copyright © 2018 Costa, Sardone, Bonaccorso, D’Antoni, Spatuzza, Gulisano, Tropea, Puzzo, Leopoldo, Lacivita, Catania and Ciranna. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Costa, Lara
Sardone, Lara Maria
Bonaccorso, Carmela Maria
D’Antoni, Simona
Spatuzza, Michela
Gulisano, Walter
Tropea, Maria Rosaria
Puzzo, Daniela
Leopoldo, Marcello
Lacivita, Enza
Catania, Maria Vincenza
Ciranna, Lucia
Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome
title Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome
title_full Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome
title_fullStr Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome
title_full_unstemmed Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome
title_short Activation of Serotonin 5-HT(7) Receptors Modulates Hippocampal Synaptic Plasticity by Stimulation of Adenylate Cyclases and Rescues Learning and Behavior in a Mouse Model of Fragile X Syndrome
title_sort activation of serotonin 5-ht(7) receptors modulates hippocampal synaptic plasticity by stimulation of adenylate cyclases and rescues learning and behavior in a mouse model of fragile x syndrome
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6176069/
https://www.ncbi.nlm.nih.gov/pubmed/30333723
http://dx.doi.org/10.3389/fnmol.2018.00353
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