The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes

Fragile X syndrome (FXS) is caused by the loss of function of Fragile X mental retardation protein (FMRP). FXS is one of the leading monogenic causes of intellectual disability (ID) and autism. Although it is caused by the failure of a single gene, FMRP that functions as an RNA binding protein affec...

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Main Authors: Patricia Cogram, Luis C. Fernández-Beltrán, María José Casarejos, Sonia Sánchez-Yepes, Eulalia Rodríguez-Martín, Alfonso García-Rubia, María José Sánchez-Barrena, Carmen Gil, Ana Martínez, Alicia Mansilla
Format: Article
Language:English
Published: Frontiers Media S.A. 2022-11-01
Series:Frontiers in Neuroscience
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Online Access:https://www.frontiersin.org/articles/10.3389/fnins.2022.1007531/full
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author Patricia Cogram
Patricia Cogram
Luis C. Fernández-Beltrán
María José Casarejos
Sonia Sánchez-Yepes
Eulalia Rodríguez-Martín
Alfonso García-Rubia
Alfonso García-Rubia
María José Sánchez-Barrena
Carmen Gil
Ana Martínez
Ana Martínez
Alicia Mansilla
Alicia Mansilla
author_facet Patricia Cogram
Patricia Cogram
Luis C. Fernández-Beltrán
María José Casarejos
Sonia Sánchez-Yepes
Eulalia Rodríguez-Martín
Alfonso García-Rubia
Alfonso García-Rubia
María José Sánchez-Barrena
Carmen Gil
Ana Martínez
Ana Martínez
Alicia Mansilla
Alicia Mansilla
author_sort Patricia Cogram
collection DOAJ
description Fragile X syndrome (FXS) is caused by the loss of function of Fragile X mental retardation protein (FMRP). FXS is one of the leading monogenic causes of intellectual disability (ID) and autism. Although it is caused by the failure of a single gene, FMRP that functions as an RNA binding protein affects a large number of genes secondarily. All these genes represent hundreds of potential targets and different mechanisms that account for multiple pathological features, thereby hampering the search for effective treatments. In this scenario, it seems desirable to reorient therapies toward more general approaches. Neuronal calcium sensor 1 (NCS-1), through its interaction with the guanine-exchange factor Ric8a, regulates the number of synapses and the probability of the release of a neurotransmitter, the two neuronal features that are altered in FXS and other neurodevelopmental disorders. Inhibitors of the NCS-1/Ric8a complex have been shown to be effective in restoring abnormally high synapse numbers as well as improving associative learning in FMRP mutant flies. Here, we demonstrate that phenothiazine FD44, an NCS-1/Ric8a inhibitor, has strong inhibition ability in situ and sufficient bioavailability in the mouse brain. More importantly, administration of FD44 to two different FXS mouse models restores well-known FXS phenotypes, such as hyperactivity, associative learning, aggressive behavior, stereotype, or impaired social approach. It has been suggested that dopamine (DA) may play a relevant role in the behavior and in neurodevelopmental disorders in general. We have measured DA and its metabolites in different brain regions, finding a higher metabolic rate in the limbic area, which is also restored with FD44 treatment. Therefore, in addition to confirming that the NCS-1/Ric8a complex is an excellent therapeutic target, we demonstrate the rescue effect of its inhibitor on the behavior of cognitive and autistic FXS mice and show DA metabolism as a FXS biochemical disease marker.
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spelling doaj.art-5be53579afca493db46daa91c8c054682022-12-22T02:49:55ZengFrontiers Media S.A.Frontiers in Neuroscience1662-453X2022-11-011610.3389/fnins.2022.10075311007531The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypesPatricia Cogram0Patricia Cogram1Luis C. Fernández-Beltrán2María José Casarejos3Sonia Sánchez-Yepes4Eulalia Rodríguez-Martín5Alfonso García-Rubia6Alfonso García-Rubia7María José Sánchez-Barrena8Carmen Gil9Ana Martínez10Ana Martínez11Alicia Mansilla12Alicia Mansilla13Department of Genetics, Institute of Ecology and Biodiversity (IEB), Faculty of Sciences, Universidad de Chile, Santiago, ChileFRAXA-DVI, FRAXA Research Foundation, Santiago, ChileDepartment of Neurobiology, Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, Madrid, SpainDepartment of Neurobiology, Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, Madrid, SpainDepartment of Neurobiology, Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, Madrid, SpainDepartment of Immunology, Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, Madrid, SpainCentro de Investigaciones Biológicas Margarita Salas-CSIC, Madrid, SpainCentro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Instituto de Salud Carlos III, Madrid, SpainInstituto de Química-Física Rocasolano, Spanish National Research Council, Madrid, SpainCentro de Investigaciones Biológicas Margarita Salas-CSIC, Madrid, SpainCentro de Investigaciones Biológicas Margarita Salas-CSIC, Madrid, SpainCentro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Instituto de Salud Carlos III, Madrid, SpainDepartment of Neurobiology, Instituto Ramón y Cajal de Investigación Sanitaria, Hospital Universitario Ramón y Cajal, Madrid, SpainDepartment of Biology Systems, Universidad de Alcala, Madrid, SpainFragile X syndrome (FXS) is caused by the loss of function of Fragile X mental retardation protein (FMRP). FXS is one of the leading monogenic causes of intellectual disability (ID) and autism. Although it is caused by the failure of a single gene, FMRP that functions as an RNA binding protein affects a large number of genes secondarily. All these genes represent hundreds of potential targets and different mechanisms that account for multiple pathological features, thereby hampering the search for effective treatments. In this scenario, it seems desirable to reorient therapies toward more general approaches. Neuronal calcium sensor 1 (NCS-1), through its interaction with the guanine-exchange factor Ric8a, regulates the number of synapses and the probability of the release of a neurotransmitter, the two neuronal features that are altered in FXS and other neurodevelopmental disorders. Inhibitors of the NCS-1/Ric8a complex have been shown to be effective in restoring abnormally high synapse numbers as well as improving associative learning in FMRP mutant flies. Here, we demonstrate that phenothiazine FD44, an NCS-1/Ric8a inhibitor, has strong inhibition ability in situ and sufficient bioavailability in the mouse brain. More importantly, administration of FD44 to two different FXS mouse models restores well-known FXS phenotypes, such as hyperactivity, associative learning, aggressive behavior, stereotype, or impaired social approach. It has been suggested that dopamine (DA) may play a relevant role in the behavior and in neurodevelopmental disorders in general. We have measured DA and its metabolites in different brain regions, finding a higher metabolic rate in the limbic area, which is also restored with FD44 treatment. Therefore, in addition to confirming that the NCS-1/Ric8a complex is an excellent therapeutic target, we demonstrate the rescue effect of its inhibitor on the behavior of cognitive and autistic FXS mice and show DA metabolism as a FXS biochemical disease marker.https://www.frontiersin.org/articles/10.3389/fnins.2022.1007531/fullFragile X syndromeNcs-1Ric8adopamineprotein-protein interaction inhibitorFmr1 knockout
spellingShingle Patricia Cogram
Patricia Cogram
Luis C. Fernández-Beltrán
María José Casarejos
Sonia Sánchez-Yepes
Eulalia Rodríguez-Martín
Alfonso García-Rubia
Alfonso García-Rubia
María José Sánchez-Barrena
Carmen Gil
Ana Martínez
Ana Martínez
Alicia Mansilla
Alicia Mansilla
The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes
Frontiers in Neuroscience
Fragile X syndrome
Ncs-1
Ric8a
dopamine
protein-protein interaction inhibitor
Fmr1 knockout
title The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes
title_full The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes
title_fullStr The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes
title_full_unstemmed The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes
title_short The inhibition of NCS-1 binding to Ric8a rescues fragile X syndrome mice model phenotypes
title_sort inhibition of ncs 1 binding to ric8a rescues fragile x syndrome mice model phenotypes
topic Fragile X syndrome
Ncs-1
Ric8a
dopamine
protein-protein interaction inhibitor
Fmr1 knockout
url https://www.frontiersin.org/articles/10.3389/fnins.2022.1007531/full
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