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Dietary zinc supplementation rescues fear-based learning and synaptic function in the Tbr1(+/-) mouse model of autism spectrum disorders / Kevin LEE in Molecular Autism, 13 (2022)
[article]
Titre : Dietary zinc supplementation rescues fear-based learning and synaptic function in the Tbr1(+/-) mouse model of autism spectrum disorders Type de document : Texte imprimé et/ou numérique Auteurs : Kevin LEE, Auteur ; Yewon JUNG, Auteur ; Yukti VYAS, Auteur ; Imogen SKELTON, Auteur ; Wickliffe C. ABRAHAM, Auteur ; Yi-Ping HSUEH, Auteur ; Johanna M. MONTGOMERY, Auteur Article en page(s) : 13 p. Langues : Anglais (eng) Mots-clés : Animals Autism Spectrum Disorder/genetics Dietary Supplements Disease Models, Animal Fear/physiology Humans Mice Microfilament Proteins/metabolism Nerve Tissue Proteins/genetics Receptors, N-Methyl-D-Aspartate Synapses/metabolism T-Box Domain Proteins/metabolism/pharmacology Zinc/metabolism/pharmacology Amygdala Autism spectrum disorder Dietary zinc supplementation Glutamatergic synapses N-methyl-D-aspartate receptors T-brain-1 Index. décimale : PER Périodiques Résumé : BACKGROUND: Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterised by a dyad of behavioural symptoms-social and communication deficits and repetitive behaviours. Multiple aetiological genetic and environmental factors have been identified as causing or increasing the likelihood of ASD, including serum zinc deficiency. Our previous studies revealed that dietary zinc supplementation can normalise impaired social behaviours, excessive grooming, and heightened anxiety in a Shank3 mouse model of ASD, as well as the amelioration of synapse dysfunction. Here, we have examined the efficacy and breadth of dietary zinc supplementation as an effective therapeutic strategy utilising a non-Shank-related mouse model of ASD-mice with Tbr1 haploinsufficiency. METHODS: We performed behavioural assays, amygdalar slice whole-cell patch-clamp electrophysiology, and immunohistochemistry to characterise the synaptic mechanisms underlying the ASD-associated behavioural deficits observed in Tbr1(+/-) mice and the therapeutic potential of dietary zinc supplementation. Two-way analysis of variance (ANOVA) with ?ídák's post hoc test and one-way ANOVA with Tukey's post hoc multiple comparisons were performed for statistical analysis. RESULTS: Our data show that dietary zinc supplementation prevents impairments in auditory fear memory and social interaction, but not social novelty, in the Tbr1(+/-) mice. Tbr1 haploinsufficiency did not induce excessive grooming nor elevate anxiety in mice. At the synaptic level, dietary zinc supplementation reversed ?-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) and N-methyl-D-aspartate receptor (NMDAR) hypofunction and normalised presynaptic function at thalamic-lateral amygdala (LA) synapses that are crucial for auditory fear memory. In addition, the zinc supplemented diet significantly restored the synaptic puncta density of the GluN1 subunit essential for functional NMDARs as well as SHANK3 expression in both the basal and lateral amygdala (BLA) of Tbr1(+/-) mice. LIMITATIONS: The therapeutic effect of dietary zinc supplementation observed in rodent models may not reproduce the same effects in human patients. The effect of dietary zinc supplementation on synaptic function in other brain structures affected by Tbr1 haploinsufficiency including olfactory bulb and anterior commissure will also need to be examined. CONCLUSIONS: Our data further the understanding of the molecular mechanisms underlying the effect of dietary zinc supplementation and verify the efficacy and breadth of its application as a potential treatment strategy for ASD. En ligne : http://dx.doi.org/10.1186/s13229-022-00494-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=477
in Molecular Autism > 13 (2022) . - 13 p.[article] Dietary zinc supplementation rescues fear-based learning and synaptic function in the Tbr1(+/-) mouse model of autism spectrum disorders [Texte imprimé et/ou numérique] / Kevin LEE, Auteur ; Yewon JUNG, Auteur ; Yukti VYAS, Auteur ; Imogen SKELTON, Auteur ; Wickliffe C. ABRAHAM, Auteur ; Yi-Ping HSUEH, Auteur ; Johanna M. MONTGOMERY, Auteur . - 13 p.
Langues : Anglais (eng)
in Molecular Autism > 13 (2022) . - 13 p.
Mots-clés : Animals Autism Spectrum Disorder/genetics Dietary Supplements Disease Models, Animal Fear/physiology Humans Mice Microfilament Proteins/metabolism Nerve Tissue Proteins/genetics Receptors, N-Methyl-D-Aspartate Synapses/metabolism T-Box Domain Proteins/metabolism/pharmacology Zinc/metabolism/pharmacology Amygdala Autism spectrum disorder Dietary zinc supplementation Glutamatergic synapses N-methyl-D-aspartate receptors T-brain-1 Index. décimale : PER Périodiques Résumé : BACKGROUND: Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterised by a dyad of behavioural symptoms-social and communication deficits and repetitive behaviours. Multiple aetiological genetic and environmental factors have been identified as causing or increasing the likelihood of ASD, including serum zinc deficiency. Our previous studies revealed that dietary zinc supplementation can normalise impaired social behaviours, excessive grooming, and heightened anxiety in a Shank3 mouse model of ASD, as well as the amelioration of synapse dysfunction. Here, we have examined the efficacy and breadth of dietary zinc supplementation as an effective therapeutic strategy utilising a non-Shank-related mouse model of ASD-mice with Tbr1 haploinsufficiency. METHODS: We performed behavioural assays, amygdalar slice whole-cell patch-clamp electrophysiology, and immunohistochemistry to characterise the synaptic mechanisms underlying the ASD-associated behavioural deficits observed in Tbr1(+/-) mice and the therapeutic potential of dietary zinc supplementation. Two-way analysis of variance (ANOVA) with ?ídák's post hoc test and one-way ANOVA with Tukey's post hoc multiple comparisons were performed for statistical analysis. RESULTS: Our data show that dietary zinc supplementation prevents impairments in auditory fear memory and social interaction, but not social novelty, in the Tbr1(+/-) mice. Tbr1 haploinsufficiency did not induce excessive grooming nor elevate anxiety in mice. At the synaptic level, dietary zinc supplementation reversed ?-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) and N-methyl-D-aspartate receptor (NMDAR) hypofunction and normalised presynaptic function at thalamic-lateral amygdala (LA) synapses that are crucial for auditory fear memory. In addition, the zinc supplemented diet significantly restored the synaptic puncta density of the GluN1 subunit essential for functional NMDARs as well as SHANK3 expression in both the basal and lateral amygdala (BLA) of Tbr1(+/-) mice. LIMITATIONS: The therapeutic effect of dietary zinc supplementation observed in rodent models may not reproduce the same effects in human patients. The effect of dietary zinc supplementation on synaptic function in other brain structures affected by Tbr1 haploinsufficiency including olfactory bulb and anterior commissure will also need to be examined. CONCLUSIONS: Our data further the understanding of the molecular mechanisms underlying the effect of dietary zinc supplementation and verify the efficacy and breadth of its application as a potential treatment strategy for ASD. En ligne : http://dx.doi.org/10.1186/s13229-022-00494-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=477 Imbalance of flight-freeze responses and their cellular correlates in the Nlgn3(-/y) rat model of autism / Natasha J. ANSTEY in Molecular Autism, 13 (2022)
[article]
Titre : Imbalance of flight-freeze responses and their cellular correlates in the Nlgn3(-/y) rat model of autism Type de document : Texte imprimé et/ou numérique Auteurs : Natasha J. ANSTEY, Auteur ; Vijayakumar KAPGAL, Auteur ; Shashank TIWARI, Auteur ; Thomas C. WATSON, Auteur ; Anna K. H. TOFT, Auteur ; Owen R. DANDO, Auteur ; Felicity H. INKPEN, Auteur ; Paul S. BAXTER, Auteur ; Zrinko KOZIĆ, Auteur ; Adam D. JACKSON, Auteur ; Xin HE, Auteur ; Mohammad SARFARAZ NAWAZ, Auteur ; Aiman KAYENAAT, Auteur ; Aditi BHATTACHARYA, Auteur ; David J. A. WYLLIE, Auteur ; Sumantra CHATTARJI, Auteur ; Emma R. WOOD, Auteur ; Oliver HARDT, Auteur ; Peter C. KIND, Auteur Article en page(s) : 34 p. Langues : Anglais (eng) Mots-clés : Animals Autistic Disorder/metabolism Fear/physiology Freezing Humans Neurons/physiology Periaqueductal Gray/metabolism Rats Autism Fear Flight Intellectual disability Neuroligin-3 Periaqueductal grey Index. décimale : PER Périodiques Résumé : BACKGROUND: Mutations in the postsynaptic transmembrane protein neuroligin-3 are highly correlative with autism spectrum disorders (ASDs) and intellectual disabilities (IDs). Fear learning is well studied in models of these disorders, however differences in fear response behaviours are often overlooked. We aim to examine fear behaviour and its cellular underpinnings in a rat model of ASD/ID lacking Nlgn3. METHODS: This study uses a range of behavioural tests to understand differences in fear response behaviour in Nlgn3(-/y) rats. Following this, we examined the physiological underpinnings of this in neurons of the periaqueductal grey (PAG), a midbrain area involved in flight-or-freeze responses. We used whole-cell patch-clamp recordings from ex vivo PAG slices, in addition to in vivo local-field potential recordings and electrical stimulation of the PAG in wildtype and Nlgn3(-/y) rats. We analysed behavioural data with two- and three-way ANOVAS and electrophysiological data with generalised linear mixed modelling (GLMM). RESULTS: We observed that, unlike the wildtype, Nlgn3(-/y) rats are more likely to response with flight rather than freezing in threatening situations. Electrophysiological findings were in agreement with these behavioural outcomes. We found in ex vivo slices from Nlgn3(-/y) rats that neurons in dorsal PAG (dPAG) showed intrinsic hyperexcitability compared to wildtype. Similarly, stimulating dPAG in vivo revealed that lower magnitudes sufficed to evoke flight behaviour in Nlgn3(-/y) than wildtype rats, indicating the functional impact of the increased cellular excitability. LIMITATIONS: Our findings do not examine what specific cell type in the PAG is likely responsible for these phenotypes. Furthermore, we have focussed on phenotypes in young adult animals, whilst the human condition associated with NLGN3 mutations appears during the first few years of life. CONCLUSIONS: We describe altered fear responses in Nlgn3(-/y) rats and provide evidence that this is the result of a circuit bias that predisposes flight over freeze responses. Additionally, we demonstrate the first link between PAG dysfunction and ASD/ID. This study provides new insight into potential pathophysiologies leading to anxiety disorders and changes to fear responses in individuals with ASD. En ligne : http://dx.doi.org/10.1186/s13229-022-00511-8 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=491
in Molecular Autism > 13 (2022) . - 34 p.[article] Imbalance of flight-freeze responses and their cellular correlates in the Nlgn3(-/y) rat model of autism [Texte imprimé et/ou numérique] / Natasha J. ANSTEY, Auteur ; Vijayakumar KAPGAL, Auteur ; Shashank TIWARI, Auteur ; Thomas C. WATSON, Auteur ; Anna K. H. TOFT, Auteur ; Owen R. DANDO, Auteur ; Felicity H. INKPEN, Auteur ; Paul S. BAXTER, Auteur ; Zrinko KOZIĆ, Auteur ; Adam D. JACKSON, Auteur ; Xin HE, Auteur ; Mohammad SARFARAZ NAWAZ, Auteur ; Aiman KAYENAAT, Auteur ; Aditi BHATTACHARYA, Auteur ; David J. A. WYLLIE, Auteur ; Sumantra CHATTARJI, Auteur ; Emma R. WOOD, Auteur ; Oliver HARDT, Auteur ; Peter C. KIND, Auteur . - 34 p.
Langues : Anglais (eng)
in Molecular Autism > 13 (2022) . - 34 p.
Mots-clés : Animals Autistic Disorder/metabolism Fear/physiology Freezing Humans Neurons/physiology Periaqueductal Gray/metabolism Rats Autism Fear Flight Intellectual disability Neuroligin-3 Periaqueductal grey Index. décimale : PER Périodiques Résumé : BACKGROUND: Mutations in the postsynaptic transmembrane protein neuroligin-3 are highly correlative with autism spectrum disorders (ASDs) and intellectual disabilities (IDs). Fear learning is well studied in models of these disorders, however differences in fear response behaviours are often overlooked. We aim to examine fear behaviour and its cellular underpinnings in a rat model of ASD/ID lacking Nlgn3. METHODS: This study uses a range of behavioural tests to understand differences in fear response behaviour in Nlgn3(-/y) rats. Following this, we examined the physiological underpinnings of this in neurons of the periaqueductal grey (PAG), a midbrain area involved in flight-or-freeze responses. We used whole-cell patch-clamp recordings from ex vivo PAG slices, in addition to in vivo local-field potential recordings and electrical stimulation of the PAG in wildtype and Nlgn3(-/y) rats. We analysed behavioural data with two- and three-way ANOVAS and electrophysiological data with generalised linear mixed modelling (GLMM). RESULTS: We observed that, unlike the wildtype, Nlgn3(-/y) rats are more likely to response with flight rather than freezing in threatening situations. Electrophysiological findings were in agreement with these behavioural outcomes. We found in ex vivo slices from Nlgn3(-/y) rats that neurons in dorsal PAG (dPAG) showed intrinsic hyperexcitability compared to wildtype. Similarly, stimulating dPAG in vivo revealed that lower magnitudes sufficed to evoke flight behaviour in Nlgn3(-/y) than wildtype rats, indicating the functional impact of the increased cellular excitability. LIMITATIONS: Our findings do not examine what specific cell type in the PAG is likely responsible for these phenotypes. Furthermore, we have focussed on phenotypes in young adult animals, whilst the human condition associated with NLGN3 mutations appears during the first few years of life. CONCLUSIONS: We describe altered fear responses in Nlgn3(-/y) rats and provide evidence that this is the result of a circuit bias that predisposes flight over freeze responses. Additionally, we demonstrate the first link between PAG dysfunction and ASD/ID. This study provides new insight into potential pathophysiologies leading to anxiety disorders and changes to fear responses in individuals with ASD. En ligne : http://dx.doi.org/10.1186/s13229-022-00511-8 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=491