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Wang AS, Wan X, Storch DS, Li VY, Cornez G, Balthazart J, Cisneros-Franco JM, de Villers-Sidani E, Sakata JT. Cross-species conservation in the regulation of parvalbumin by perineuronal nets. Front Neural Circuits 2023; 17:1297643. [PMID: 38179221 PMCID: PMC10766385 DOI: 10.3389/fncir.2023.1297643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/29/2023] [Indexed: 01/06/2024] Open
Abstract
Parvalbumin (PV) neurons play an integral role in regulating neural dynamics and plasticity. Therefore, understanding the factors that regulate PV expression is important for revealing modulators of brain function. While the contribution of PV neurons to neural processes has been studied in mammals, relatively little is known about PV function in non-mammalian species, and discerning similarities in the regulation of PV across species can provide insight into evolutionary conservation in the role of PV neurons. Here we investigated factors that affect the abundance of PV in PV neurons in sensory and motor circuits of songbirds and rodents. In particular, we examined the degree to which perineuronal nets (PNNs), extracellular matrices that preferentially surround PV neurons, modulate PV abundance as well as how the relationship between PV and PNN expression differs across brain areas and species and changes over development. We generally found that cortical PV neurons that are surrounded by PNNs (PV+PNN neurons) are more enriched with PV than PV neurons without PNNs (PV-PNN neurons) across both rodents and songbirds. Interestingly, the relationship between PV and PNN expression in the vocal portion of the basal ganglia of songbirds (Area X) differed from that in other areas, with PV+PNN neurons having lower PV expression compared to PV-PNN neurons. These relationships remained consistent across development in vocal motor circuits of the songbird brain. Finally, we discovered a causal contribution of PNNs to PV expression in songbirds because degradation of PNNs led to a diminution of PV expression in PV neurons. These findings reveal a conserved relationship between PV and PNN expression in sensory and motor cortices and across songbirds and rodents and suggest that PV neurons could modulate plasticity and neural dynamics in similar ways across songbirds and rodents.
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Affiliation(s)
- Angela S. Wang
- Department of Biology, McGill University, Montreal, QC, Canada
| | - Xinghaoyun Wan
- Department of Biology, McGill University, Montreal, QC, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
| | | | - Vivian Y. Li
- Department of Biology, McGill University, Montreal, QC, Canada
| | - Gilles Cornez
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Jacques Balthazart
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | | | - Etienne de Villers-Sidani
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
- Centre for Research in Brain, Language and Music, McGill University, Montreal, QC, Canada
| | - Jon T. Sakata
- Department of Biology, McGill University, Montreal, QC, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
- Centre for Research in Brain, Language and Music, McGill University, Montreal, QC, Canada
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2
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Balthazart J. Steroid-dependent plasticity in the song control system: Perineuronal nets and HVC neurogenesis. Front Neuroendocrinol 2023; 71:101097. [PMID: 37611808 PMCID: PMC10841294 DOI: 10.1016/j.yfrne.2023.101097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/28/2023] [Accepted: 08/19/2023] [Indexed: 08/25/2023]
Abstract
The vocal control nucleus HVC in songbirds has emerged as a widespread model system to study adult brain plasticity in response to changes in the hormonal and social environment. I review here studies completed in my laboratory during the last decade that concern two aspects of this plasticity: changes in aggregations of extracellular matrix components surrounding the soma of inhibitory parvalbumin-positive neurons called perineuronal nets (PNN) and the production/incorporation of new neurons. Both features are modulated by the season, age, sex and endocrine status of the birds in correlation with changes in song structure and stability. Causal studies have also investigated the role of PNN and of new neurons in the control of song. Dissolving PNN with chondroitinase sulfate, a specific enzyme applied directly on HVC or depletion of new neurons by focalized X-ray irradiation both affected song structure but the amplitude of changes was limited and deserves further investigations.
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3
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Wang AS, Wan X, Storch DS, Cornez G, Balthazart J, Cisneros-Franco JM, de Villers-Sidani E, Sakata JT. Cross-species conservation in the regulation of parvalbumin by perineuronal nets. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.13.557580. [PMID: 37745532 PMCID: PMC10515890 DOI: 10.1101/2023.09.13.557580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Parvalbumin (PV) neurons play an integral role in regulating neural dynamics and plasticity. Therefore, understanding the factors that regulate PV expression is important for revealing modulators of brain function. While the contribution of PV neurons to neural processes has been studied in mammals, relatively little is known about PV function in non-mammalian species, and discerning similarities in the regulation of PV across species can provide insight into evolutionary conservation in the role of PV neurons. Here we investigated factors that affect the abundance of PV in PV neurons in sensory and motor circuits of songbirds and rodents. In particular, we examined the degree to which perineuronal nets (PNNs), extracellular matrices that preferentially surround PV neurons, modulate PV abundance as well as how the relationship between PV and PNN expression differs across brain areas and species and changes over development. We generally found that cortical PV neurons that are surrounded by PNNs (PV+PNN neurons) are more enriched with PV than PV neurons without PNNs (PV-PNN neurons) across both rodents and songbirds. Interestingly, the relationship between PV and PNN expression in the vocal portion of the basal ganglia of songbirds (Area X) differed from that in other areas, with PV+PNN neurons having lower PV expression compared to PV-PNN neurons. These relationships remained consistent across development in vocal motor circuits of the songbird brain. Finally, we discovered a causal contribution of PNNs to PV expression in songbirds because degradation of PNNs led to a diminution of PV expression in PV neurons. These findings in reveal a conserved relationship between PV and PNN expression in sensory and motor cortices and across songbirds and rodents and suggest that PV neurons could modulate plasticity and neural dynamics in similar ways across songbirds and rodents.
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Affiliation(s)
- Angela S. Wang
- Department of Biology, McGill University, Montreal, Canada
| | - Xinghaoyun Wan
- Department of Biology, McGill University, Montreal, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, Canada
| | | | - Gilles Cornez
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Jacques Balthazart
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | | | - Etienne de Villers-Sidani
- Integrated Program in Neuroscience, McGill University, Montreal, Canada
- Centre for Research in Brain, Language and Music, McGill University, Montreal, Canada
| | - Jon T. Sakata
- Department of Biology, McGill University, Montreal, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, Canada
- Centre for Research in Brain, Language and Music, McGill University, Montreal, Canada
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4
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Saleki K, Banazadeh M, Saghazadeh A, Rezaei N. Aging, testosterone, and neuroplasticity: friend or foe? Rev Neurosci 2022; 34:247-273. [PMID: 36017670 DOI: 10.1515/revneuro-2022-0033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 07/03/2022] [Indexed: 11/15/2022]
Abstract
Neuroplasticity or neural plasticity implicates the adaptive potential of the brain in response to extrinsic and intrinsic stimuli. The concept has been utilized in different contexts such as injury and neurological disease. Neuroplasticity mechanisms have been classified into neuroregenerative and function-restoring processes. In the context of injury, neuroplasticity has been defined in three post-injury epochs. Testosterone plays a key yet double-edged role in the regulation of several neuroplasticity alterations. Research has shown that testosterone levels are affected by numerous factors such as age, stress, surgical procedures on gonads, and pharmacological treatments. There is an ongoing debate for testosterone replacement therapy (TRT) in aging men; however, TRT is more useful in young individuals with testosterone deficit and more specific subgroups with cognitive dysfunction. Therefore, it is important to pay early attention to testosterone profile and precisely uncover its harms and benefits. In the present review, we discuss the influence of environmental factors, aging, and gender on testosterone-associated alterations in neuroplasticity, as well as the two-sided actions of testosterone in the nervous system. Finally, we provide practical insights for further study of pharmacological treatments for hormonal disorders focusing on restoring neuroplasticity.
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Affiliation(s)
- Kiarash Saleki
- Student Research Committee, Babol University of Medical Sciences, 47176 47745 Babol, Iran.,USERN Office, Babol University of Medical Sciences, 47176 47745 Babol, Iran.,Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), 14197 33151 Tehran, Iran
| | - Mohammad Banazadeh
- Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), 14197 33151 Tehran, Iran.,Pharmaceutical Sciences and Cosmetic Products Research Center, Kerman University of Medical Sciences, 76169 13555 Kerman, Iran
| | - Amene Saghazadeh
- Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), 14197 33151 Tehran, Iran.,Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, 14197 33151 Tehran, Iran
| | - Nima Rezaei
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, 14197 33151 Tehran, Iran.,Department of Immunology, School of Medicine, Tehran University of Medical Sciences, 14176 13151 Tehran, Iran.,Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), 14197 33151 Tehran, Iran
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5
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Ray MH, Williams BR, Kuppe MK, Bryant CD, Logan RW. A Glitch in the Matrix: The Role of Extracellular Matrix Remodeling in Opioid Use Disorder. Front Integr Neurosci 2022; 16:899637. [PMID: 35757099 PMCID: PMC9218427 DOI: 10.3389/fnint.2022.899637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 05/20/2022] [Indexed: 12/02/2022] Open
Abstract
Opioid use disorder (OUD) and deaths from drug overdoses have reached unprecedented levels. Given the enormous impact of the opioid crisis on public health, a more thorough, in-depth understanding of the consequences of opioids on the brain is required to develop novel interventions and pharmacological therapeutics. In the brain, the effects of opioids are far reaching, from genes to cells, synapses, circuits, and ultimately behavior. Accumulating evidence implicates a primary role for the extracellular matrix (ECM) in opioid-induced plasticity of synapses and circuits, and the development of dependence and addiction to opioids. As a network of proteins and polysaccharides, including cell adhesion molecules, proteases, and perineuronal nets, the ECM is intimately involved in both the formation and structural support of synapses. In the human brain, recent findings support an association between altered ECM signaling and OUD, particularly within the cortical and striatal circuits involved in cognition, reward, and craving. Furthermore, the ECM signaling proteins, including matrix metalloproteinases and proteoglycans, are directly involved in opioid seeking, craving, and relapse behaviors in rodent opioid models. Both the impact of opioids on the ECM and the role of ECM signaling proteins in opioid use disorder, may, in part, depend on biological sex. Here, we highlight the current evidence supporting sex-specific roles for ECM signaling proteins in the brain and their associations with OUD. We emphasize knowledge gaps and future directions to further investigate the potential of the ECM as a therapeutic target for the treatment of OUD.
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Affiliation(s)
- Madelyn H Ray
- Laboratory of Sleep, Rhythms, and Addiction, Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, United States.,Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States
| | - Benjamin R Williams
- Laboratory of Sleep, Rhythms, and Addiction, Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, United States
| | - Madeline K Kuppe
- Laboratory of Sleep, Rhythms, and Addiction, Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, United States.,Center for Systems Neuroscience, Boston University, Boston, MA, United States
| | - Camron D Bryant
- Center for Systems Neuroscience, Boston University, Boston, MA, United States.,Laboratory of Addiction Genetics, Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, United States.,Department of Psychiatry, Boston University School of Medicine, Boston, MA, United States
| | - Ryan W Logan
- Laboratory of Sleep, Rhythms, and Addiction, Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, United States.,Center for Systems Neuroscience, Boston University, Boston, MA, United States.,Genome Science Institute, Boston University School of Medicine, Boston, MA, United States
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6
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Lukacova K, Hamaide J, Baciak L, Van der Linden A, Kubikova L. Striatal Injury Induces Overall Brain Alteration at the Pallial, Thalamic, and Cerebellar Levels. BIOLOGY 2022; 11:biology11030425. [PMID: 35336799 PMCID: PMC8945699 DOI: 10.3390/biology11030425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 03/02/2022] [Accepted: 03/08/2022] [Indexed: 12/02/2022]
Abstract
Simple Summary Magnetic resonance imaging showed that striatal injury leads to structural changes within several brain areas. Here, we specify these changes via gene expression of synaptic plasticity markers, neuronal markers, assessing the number of newborn cells as well as cell densities. We found that the injury resulted in long-lasting modifications involving plasticity and neural protection mechanisms in areas directly as well as indirectly connected with the damaged striatum, including the cerebellum. Abstract The striatal region Area X plays an important role during song learning, sequencing, and variability in songbirds. A previous study revealed that neurotoxic damage within Area X results in micro and macrostructural changes across the entire brain, including the downstream dorsal thalamus and both the upstream pallial nucleus HVC (proper name) and the deep cerebellar nuclei (DCN). Here, we specify these changes on cellular and gene expression levels. We found decreased cell density in the thalamic and cerebellar areas and HVC, but it was not related to neuronal loss. On the contrary, perineuronal nets (PNNs) in HVC increased for up to 2 months post-lesion, suggesting their protecting role. The synaptic plasticity marker Forkhead box protein P2 (FoxP2) showed a bi-phasic increase at 8 days and 3 months post-lesion, indicating a massive synaptic rebuilding. The later increase in HVC was associated with the increased number of new neurons. These data suggest that the damage in the striatal vocal nucleus induces cellular and gene expression alterations in both the efferent and afferent destinations. These changes may be long-lasting and involve plasticity and neural protection mechanisms in the areas directly connected to the injury site and also to distant areas, such as the cerebellum.
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Affiliation(s)
- Kristina Lukacova
- Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, 840 05 Bratislava, Slovakia
- Correspondence: (K.L.); (L.K.)
| | - Julie Hamaide
- Bio-Imaging Laboratory, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, B-2610 Antwerp, Belgium; (J.H.); (A.V.d.L.)
| | - Ladislav Baciak
- Central Laboratories, Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia;
| | - Annemie Van der Linden
- Bio-Imaging Laboratory, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, B-2610 Antwerp, Belgium; (J.H.); (A.V.d.L.)
| | - Lubica Kubikova
- Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, 840 05 Bratislava, Slovakia
- Correspondence: (K.L.); (L.K.)
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7
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Cornez G, Valle S, dos Santos EB, Chiver I, Müller W, Ball GF, Cornil CA, Balthazart J. Perineuronal nets in HVC and plasticity in male canary song. PLoS One 2021; 16:e0252560. [PMID: 34449793 PMCID: PMC8396724 DOI: 10.1371/journal.pone.0252560] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 08/10/2021] [Indexed: 01/05/2023] Open
Abstract
Songbirds learn their vocalizations during developmental sensitive periods of song memorization and sensorimotor learning. Some seasonal songbirds, called open-ended learners, recapitulate transitions from sensorimotor learning and song crystallization on a seasonal basis during adulthood. In adult male canaries, sensorimotor learning occurs each year in autumn and leads to modifications of the syllable repertoire during successive breeding seasons. We previously showed that perineuronal nets (PNN) expression in song control nuclei decreases during this sensorimotor learning period. Here we explored the causal link between PNN expression in adult canaries and song modification by enzymatically degrading PNN in HVC, a key song control system nucleus. Three independent experiments identified limited effects of the PNN degradation in HVC on the song structure of male canaries. They clearly establish that presence of PNN in HVC is not required to maintain general features of crystallized song. Some suggestion was collected that PNN are implicated in the stability of song repertoires but this evidence is too preliminary to draw firm conclusions and additional investigations should consider producing PNN degradations at specified time points of the seasonal cycle. It also remains possible that once song has been crystallized at the beginning of the first breeding season, PNN no longer play a key role in determining song structure; this could be tested by treatments with chondroitinase ABC at key steps in ontogeny. It would in this context be important to develop multiple stereotaxic procedures allowing the simultaneous bilateral degradation of PNN in several song control nuclei for extended periods.
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Affiliation(s)
- Gilles Cornez
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Shelley Valle
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Ednei Barros dos Santos
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Ioana Chiver
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Wendt Müller
- Behavioural Ecology and Ecophysiology Lab, University of Antwerp, Antwerp, Belgium
| | - Gregory F. Ball
- Department of Psychology, University of Maryland, Maryland, College Park, MD, United States of America
| | - Charlotte A. Cornil
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Jacques Balthazart
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
- * E-mail:
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8
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Ciccarelli A, Weijers D, Kwan W, Warner C, Bourne J, Gross CT. Sexually dimorphic perineuronal nets in the rodent and primate reproductive circuit. J Comp Neurol 2021; 529:3274-3291. [PMID: 33950531 DOI: 10.1002/cne.25167] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 04/20/2021] [Accepted: 04/23/2021] [Indexed: 12/21/2022]
Abstract
Perineuronal nets are extracellular glycoprotein structures that have been found on some neurons in the central nervous system and that have been shown to regulate their structural plasticity. Until now work on perineuronal nets has been focused on their role in cortical structures where they are selectively expressed on parvalbumin-positive neurons and are reported to restrict the experience-dependent plasticity of inhibitory afferents. Here, we examined the expression of perineuronal nets subcortically, showing that they are expressed in several discrete structures, including nuclei that comprise the brain network controlling reproductive behaviors (e.g., mounting, lordosis, aggression, and social defense). In particular, perineuronal nets were found in the posterior dorsal division of the medial amygdala, the medial preoptic nucleus, the posterior medial bed nucleus of the stria terminalis, the ventrolateral ventromedial hypothalamus and adjacent tuberal nucleus, and the ventral premammillary nucleus in both the mouse and primate brain. Comparison of perineuronal nets in male and female mice revealed a significant sexually dimorphic expression, with expression found prominently on estrogen receptor expressing neurons in the medial amygdala. These findings suggest that perineuronal nets may be involved in regulating neural plasticity in the mammalian reproductive system.
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Affiliation(s)
- Alessandro Ciccarelli
- Epigenetics & Neurobiology Unit, EMBL Rome, European Molecular Biology Laboratory, Rome
| | - Dilys Weijers
- Epigenetics & Neurobiology Unit, EMBL Rome, European Molecular Biology Laboratory, Rome
| | - William Kwan
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria, Australia
| | - Claire Warner
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria, Australia
| | - James Bourne
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria, Australia
| | - Cornelius T Gross
- Epigenetics & Neurobiology Unit, EMBL Rome, European Molecular Biology Laboratory, Rome
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9
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Cornez G, Collignon C, Müller W, Cornil CA, Ball GF, Balthazart J. Development of Perineuronal Nets during Ontogeny Correlates with Sensorimotor Vocal Learning in Canaries. eNeuro 2020; 7:ENEURO.0361-19.2020. [PMID: 32169884 PMCID: PMC7160306 DOI: 10.1523/eneuro.0361-19.2020] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 02/11/2020] [Accepted: 02/17/2020] [Indexed: 12/26/2022] Open
Abstract
Songbirds are a powerful model to study vocal learning given that aspects of the underlying behavioral and neurobiological mechanisms are analogous in many ways to mechanisms involved in speech learning. Perineuronal nets (PNNs) represent one of the mechanisms controlling the closing of sensitive periods for vocal learning in the songbird brain. In zebra finches, PNN develop around parvalbumin (PV)-expressing interneurons in selected song control nuclei during ontogeny and their development is delayed if juveniles are deprived of a tutor. However, song learning in zebra finches takes place during a relatively short period of development, and it is difficult to determine whether PNN development correlates with the end of the sensory or the sensorimotor learning period. Canaries have a longer period of sensorimotor vocal learning, spanning over their first year of life so that it should be easier to test whether PNN development correlates with the end of sensory or sensorimotor vocal learning. Here, we quantified PNN around PV-interneurons in the brain of male canaries from hatching until the first breeding season and analyzed in parallel the development of their song. PNN development around PV-interneurons specifically took place and their number reached its maximum around the end of the sensorimotor learning stage, well after the end of sensory vocal learning, and correlated with song development. This suggests that PNN are specifically involved in the termination of the sensitive period for sensorimotor vocal learning.
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Affiliation(s)
- Gilles Cornez
- Behavioral Neuroendocrinology Lab, GIGA Neurosciences, University of Liege, Liege 4000, Belgium
| | - Clémentine Collignon
- Behavioral Neuroendocrinology Lab, GIGA Neurosciences, University of Liege, Liege 4000, Belgium
| | - Wendt Müller
- Behavioural Ecology and Ecophysiology Research group, University of Antwerp, Antwerp 2000, Belgium
| | - Charlotte A Cornil
- Behavioral Neuroendocrinology Lab, GIGA Neurosciences, University of Liege, Liege 4000, Belgium
| | - Gregory F Ball
- Department of Psychology, University of Maryland, College Park, 20742, MD
| | - Jacques Balthazart
- Behavioral Neuroendocrinology Lab, GIGA Neurosciences, University of Liege, Liege 4000, Belgium
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10
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11
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Cornez G, Shevchouk OT, Ghorbanpoor S, Ball GF, Cornil CA, Balthazart J. Testosterone stimulates perineuronal nets development around parvalbumin cells in the adult canary brain in parallel with song crystallization. Horm Behav 2020; 119:104643. [PMID: 31785283 PMCID: PMC7065963 DOI: 10.1016/j.yhbeh.2019.104643] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 10/25/2022]
Abstract
Perineuronal nets (PNN) of the extracellular matrix are dense aggregations of chondroitin-sulfate proteoglycans that usually surround fast-spiking parvalbumin-expressing inhibitory interneurons (PV). The development of PNN around PV appears specifically at the end of sensitive periods of visual learning and limits the synaptic plasticity in the visual cortex of mammals. Seasonal songbirds display a high level of adult neuroplasticity associated with vocal learning, which is regulated by fluctuations of circulating testosterone concentrations. Seasonal changes in testosterone concentrations and in neuroplasticity are associated with vocal changes between the non-breeding and breeding seasons. Increases in blood testosterone concentrations in the spring lead to the annual crystallization of song so that song becomes more stereotyped. Here we explore whether testosterone also regulates PNN expression in the song control system of male and female canaries. We show that, in both males and females, testosterone increases the number of PNN and of PV neurons in the three main telencephalic song control nuclei HVC, RA (nucleus robustus arcopallialis) and Area X and increases the PNN localization around PV interneurons. Singing activity was recorded in males and quantitative analyses demonstrated that testosterone also increased male singing rate, song duration and song energy while decreasing song entropy. Together, these data suggest that the development of PNN could provide the synaptic stability required to maintain the stability of the testosterone-induced crystallized song. This provides the new evidence for a role of PNN in the regulation of adult seasonal plasticity in seasonal songbirds.
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Affiliation(s)
- Gilles Cornez
- GIGA Neuroscience, University of Liege, Liege 4000, Belgium
| | | | | | - Gregory F Ball
- Department of Psychology, University of Maryland, College Park, MD 20742, USA
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12
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Cornez G, Langro J, Cornil CA, Balthazart J, Lynch KS. Comparing perineuronal nets and parvalbumin development between blackbird species with differences in early developmental song exposure. ACTA ACUST UNITED AC 2020; 223:jeb.212910. [PMID: 31767738 DOI: 10.1242/jeb.212910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 11/20/2019] [Indexed: 11/20/2022]
Abstract
Brood parasitic songbirds are a natural system in which developing birds are isolated from species-typical song and therefore present a unique opportunity to compare neural plasticity in song learners raised with and without conspecific tutors. We compared perineuronal nets (PNN) and parvalbumin (PV) in song control nuclei in juveniles and adults of two closely related icterid species (i.e. blackbirds): brown-headed cowbirds (Molothrus ater; brood parasite) and red-winged blackbirds (Agelaius phoeniceus; non-parasite). The number of PV cells per nucleus was significantly higher in adults compared with juveniles in the nucleus HVC and the robust nucleus of the arcopallium (RA), whereas no significant species difference appeared in any region of interest. The number of PNN per nuclei was significantly higher in adults compared with juveniles in HVC, RA and Area X, but only RA exhibited a significant difference between species. PV cells surrounded by PNN (PV+PNN) also exhibited age-related differences in HVC, RA and Area X, but RA was the only region in which PV+PNN exhibited significant species differences. Furthermore, a significant interaction existed in RA between age and species with respect to PNN and PV+PNN, revealing RA as a region displaying differing plasticity patterns across age and species. Additional comparisons of PNN and PV between adult male and female cowbirds revealed that males have greater numbers of all three measures in RA compared with females. Species-, sex- and age-related differences in RA suggest that species differences in neural plasticity are related to differences in song production rather than sensitivity to song learning, despite a stark contrast in early exposure to conspecific male tutors.
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Affiliation(s)
- Gilles Cornez
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, 4000 Liege, Belgium
| | - Justin Langro
- Department of Biology, Hofstra University, Hempstead, NY 11549, USA
| | - Charlotte A Cornil
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, 4000 Liege, Belgium
| | - Jacques Balthazart
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, 4000 Liege, Belgium
| | - Kathleen S Lynch
- Department of Biology, Hofstra University, Hempstead, NY 11549, USA
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13
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Cornez G, Collignon C, Müller W, Ball GF, Cornil CA, Balthazart J. Seasonal changes of perineuronal nets and song learning in adult canaries (Serinus canaria). Behav Brain Res 2019; 380:112437. [PMID: 31857148 DOI: 10.1016/j.bbr.2019.112437] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 11/16/2019] [Accepted: 12/14/2019] [Indexed: 01/31/2023]
Abstract
Songbirds learn their song during a sensitive period of development associated with enhanced neural plasticity. In addition, in open-ended learners such as canaries, a sensitive period for sensorimotor vocal learning reopens each year in the fall and leads to song modifications between successive breeding seasons. The variability observed in song production across seasons in adult canaries correlates with seasonal fluctuations of testosterone concentrations and with morphological changes in nuclei of the song control system (SCS). The sensitive periods for song learning during ontogeny and then again in adulthood could be controlled by the development of perineuronal nets (PNN) around parvalbumin-expressing interneurones (PV) which limits learning-induced neuroplasticity. However, this relationship has never been investigated in the context of adult vocal learning in adult songbirds. Here we explored PNN and PV expression in the SCS of adult male Fife Fancy canaries in relation to the seasonal variations of their singing behaviour. We found a clear pattern of seasonal variation in testosterone concentrations and song production. Furthermore, PNN expression was significantly higher in two specific song control nuclei, the robust nucleus of the arcopallium (RA) and the Area X of the basal ganglia, during the breeding season and during the later stages of sensorimotor song development compared to birds in an earlier stage of sensorimotor development during the fall. These data provide the first evidence that changes in PNN expression could represent a mechanism regulating the closing-reopening of sensitive periods for vocal learning across seasons in adult songbirds.
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Affiliation(s)
- Gilles Cornez
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Belgium
| | - Clémentine Collignon
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Belgium
| | - Wendt Müller
- Behavioural Ecology and Ecophysiology Research Group, University of Antwerp, Belgium
| | - Gregory F Ball
- Department of Psychology, University of Maryland, College Park MD, USA
| | - Charlotte A Cornil
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Belgium
| | - Jacques Balthazart
- Laboratory of Behavioral Neuroendocrinology, GIGA Neurosciences, University of Liege, Belgium.
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14
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Balthazart J. New concepts in the study of the sexual differentiation and activation of reproductive behavior, a personal view. Front Neuroendocrinol 2019; 55:100785. [PMID: 31430485 PMCID: PMC6858558 DOI: 10.1016/j.yfrne.2019.100785] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 08/13/2019] [Accepted: 08/16/2019] [Indexed: 01/09/2023]
Abstract
Since the beginning of this century, research methods in neuroendocrinology enjoyed extensive refinements and innovation. These advances allowed collection of huge amounts of new data and the development of new ideas but have not led to this point, with a few exceptions, to the development of new conceptual advances. Conceptual advances that took place largely resulted from the ingenious insights of several investigators. I summarize here some of these new ideas as they relate to the sexual differentiation and activation by sex steroids of reproductive behaviors and I discuss how our research contributed to the general picture. This selective review clearly demonstrates the importance of conceptual changes that have taken place in this field since beginning of the 21st century. The recent technological advances suggest that our understanding of hormones, brain and behavior relationships will continue to improve in a very fundamental manner over the coming years.
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15
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Sexual dimorphism of inhibitory synaptic transmission in RA projection neurons of songbirds. Neurosci Lett 2019; 709:134377. [PMID: 31352043 DOI: 10.1016/j.neulet.2019.134377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Revised: 07/14/2019] [Accepted: 07/15/2019] [Indexed: 11/21/2022]
Abstract
The song control system in the brain of songbirds is important for the production and acquisition of song and exhibits some of the largest neural sex differences observed in vertebrates. The robust nucleus of the arcopallium (RA) is a premotor nucleus, playing a key role in controlling singing. RA projection neurons (PNs) receives denser synapse inputs including excitatory in males than in females. However, the inhibitory synaptic transmission in the RA has not been reported. In the present study, using whole-cell voltage-clamp recording, spontaneous inhibitory postsynaptic currents (sIPSCs) and miniature inhibitory postsynaptic currents (mIPSCs) of the males and females were recorded. The average frequency and amplitude of sIPSCs/mIPSCs in males were higher than females. These results demonstrate the sexually dimorphic of the inhibitory synaptic transmission in the RA PNs and the RA PNs in males receive more inhibitory synaptic transmission. These findings contribute to further illuminate the neural mechanisms under the sexually dimorphism song production of adult zebra finches.
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16
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Testosterone or Estradiol When Implanted in the Medial Preoptic Nucleus Trigger Short Low-Amplitude Songs in Female Canaries. eNeuro 2019; 6:ENEURO.0502-18.2019. [PMID: 31068363 PMCID: PMC6506820 DOI: 10.1523/eneuro.0502-18.2019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 04/01/2019] [Accepted: 04/07/2019] [Indexed: 11/21/2022] Open
Abstract
In male songbirds, the motivation to sing is largely regulated by testosterone (T) action in the medial preoptic area, whereas T acts on song control nuclei to modulate aspects of song quality. Stereotaxic implantation of T in the medial preoptic nucleus (POM) of castrated male canaries activates a high rate of singing activity, albeit with a longer latency than after systemic T treatment. Systemic T also increases the occurrence of male-like song in female canaries. We hypothesized that this effect is also mediated by T action in the POM. Females were stereotaxically implanted with either T or with 17β-estradiol (E2) targeted at the POM and their singing activity was recorded daily during 2 h for 28 d until brains were collected for histological analyses. Following identification of implant localizations, three groups of subjects were constituted that had either T or E2 implanted in the POM or had an implant that had missed the POM (Out). T and E2 in POM significantly increased the number of songs produced and the percentage of time spent singing as compared with the Out group. The songs produced were in general of a short duration and of poor quality. This effect was not associated with an increase in HVC volume as observed in males, but T in POM enhanced neurogenesis in HVC, as reflected by an increased density of doublecortin-immunoreactive (DCX-ir) multipolar neurons. These data indicate that, in female canaries, T acting in the POM plays a significant role in hormone-induced increases in the motivation to sing.
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17
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Cornez G, Jonckers E, Ter Haar SM, Van der Linden A, Cornil CA, Balthazart J. Timing of perineuronal net development in the zebra finch song control system correlates with developmental song learning. Proc Biol Sci 2018; 285:rspb.2018.0849. [PMID: 30051835 DOI: 10.1098/rspb.2018.0849] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 06/25/2018] [Indexed: 12/22/2022] Open
Abstract
The appearance of perineuronal nets (PNNs) represents one of the mechanisms that contribute to the closing of sensitive periods for neural plasticity. This relationship has mostly been studied in the ocular dominance model in rodents. Previous studies also indicated that PNN might control neural plasticity in the song control system of songbirds. To further elucidate this relationship, we quantified PNN expression and their localization around parvalbumin interneurons at key time-points during ontogeny in both male and female zebra finches, and correlated these data with the well-described development of song in this species. We also extended these analyses to the auditory system. The development of PNN during ontogeny correlated with song crystallization although the timing of PNN appearance in the four main telencephalic song control nuclei slightly varied between nuclei in agreement with the established role these nuclei play during song learning. Our data also indicate that very few PNN develop in the secondary auditory forebrain areas even in adult birds, which may allow constant adaptation to a changing acoustic environment by allowing synaptic reorganization during adulthood.
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Affiliation(s)
- Gilles Cornez
- GIGA Neuroscience, University of Liege, Liege 4000, Belgium
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18
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London SE. Developmental song learning as a model to understand neural mechanisms that limit and promote the ability to learn. Behav Processes 2017; 163:13-23. [PMID: 29162376 DOI: 10.1016/j.beproc.2017.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 10/04/2017] [Accepted: 11/10/2017] [Indexed: 12/27/2022]
Abstract
Songbirds famously learn their vocalizations. Some species can learn continuously, others seasonally, and still others just once. The zebra finch (Taeniopygia guttata) learns to sing during a single developmental "Critical Period," a restricted phase during which a specific experience has profound and permanent effects on brain function and behavioral patterns. The zebra finch can therefore provide fundamental insight into features that promote and limit the ability to acquire complex learned behaviors. For example, what properties permit the brain to come "on-line" for learning? How does experience become encoded to prevent future learning? What features define the brain in receptive compared to closed learning states? This piece will focus on epigenomic, genomic, and molecular levels of analysis that operate on the timescales of development and complex behavioral learning. Existing data will be discussed as they relate to Critical Period learning, and strategies for future studies to more directly address these questions will be considered. Birdsong learning is a powerful model for advancing knowledge of the biological intersections of maturation and experience. Lessons from its study not only have implications for understanding developmental song learning, but also broader questions of learning potential and the enduring effects of early life experience on neural systems and behavior.
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Affiliation(s)
- Sarah E London
- Department of Psychology, Institute for Mind and Biology, Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, University of Chicago, 940 E 57th Street, Chicago, IL 60637, USA.
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19
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Cornez G, Madison FN, Van der Linden A, Cornil C, Yoder KM, Ball GF, Balthazart J. Perineuronal nets and vocal plasticity in songbirds: A proposed mechanism to explain the difference between closed-ended and open-ended learning. Dev Neurobiol 2017; 77:975-994. [PMID: 28170164 DOI: 10.1002/dneu.22485] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 12/16/2016] [Accepted: 01/05/2017] [Indexed: 11/09/2022]
Abstract
Perineuronal nets (PNN) are aggregations of chondroitin sulfate proteoglycans surrounding the soma and proximal processes of neurons, mostly GABAergic interneurons expressing parvalbumin. They limit the plasticity of their afferent synaptic connections. In zebra finches PNN develop in an experience-dependent manner in the song control nuclei HVC and RA (nucleus robustus arcopallialis) when young birds crystallize their song. Because songbird species that are open-ended learners tend to recapitulate each year the different phases of song learning until their song crystallizes at the beginning of the breeding season, we tested whether seasonal changes in PNN expression would be found in the song control nuclei of a seasonally breeding species such as the European starling. Only minimal changes in PNN densities and total number of cells surrounded by PNN were detected. However, comparison of the density of PNN and of PNN surrounding parvalbumin-positive cells revealed that these structures are far less numerous in starlings that show extensive adult vocal plasticity, including learning of new songs throughout the year, than in the closed-ended learner zebra finches. Canaries that also display some vocal plasticity across season but were never formally shown to learn new songs in adulthood were intermediate in this respect. Together these data suggest that establishment of PNN around parvalbumin-positive neurons in song control nuclei has diverged during evolution to control the different learning capacities observed in songbird species. This differential expression of PNN in different songbird species could represent a key cellular mechanism mediating species variation between closed-ended and open-ended learning strategies. © 2017 Wiley Periodicals, Inc. Develop Neurobiol 77: 975-994, 2017.
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Affiliation(s)
- Gilles Cornez
- GIGA Neuroscience, University of Liege, Liege, 4000, Belgium
| | - Farrah N Madison
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, Maryland, 21218.,Department of Psychology, University of Maryland, College Park, College Park, Maryland, 20742
| | | | | | - Kathleen M Yoder
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, Maryland, 21218
| | - Gregory F Ball
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, Maryland, 21218.,Department of Psychology, University of Maryland, College Park, College Park, Maryland, 20742
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20
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Shevchouk OT, Ghorbanpoor S, Ball GF, Cornil CA, Balthazart J. Testosterone-induced neuroendocrine changes in the medial preoptic area precede song activation and plasticity in song control nuclei of female canaries. Eur J Neurosci 2017; 45:886-900. [DOI: 10.1111/ejn.13530] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 12/26/2016] [Accepted: 01/24/2017] [Indexed: 01/19/2023]
Affiliation(s)
- Olesya T. Shevchouk
- GIGA Neurosciences; University of Liege; 15 avenue Hippocrate B-4000 Liège Belgium
| | - Samar Ghorbanpoor
- GIGA Neurosciences; University of Liege; 15 avenue Hippocrate B-4000 Liège Belgium
| | - Gregory F. Ball
- Department of Psychology; University of Maryland; College Park MD USA
| | - Charlotte A. Cornil
- GIGA Neurosciences; University of Liege; 15 avenue Hippocrate B-4000 Liège Belgium
| | - Jacques Balthazart
- GIGA Neurosciences; University of Liege; 15 avenue Hippocrate B-4000 Liège Belgium
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21
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Hamaide J, De Groof G, Van Steenkiste G, Jeurissen B, Van Audekerke J, Naeyaert M, Van Ruijssevelt L, Cornil C, Sijbers J, Verhoye M, Van der Linden A. Exploring sex differences in the adult zebra finch brain: In vivo diffusion tensor imaging and ex vivo super-resolution track density imaging. Neuroimage 2016; 146:789-803. [PMID: 27697612 DOI: 10.1016/j.neuroimage.2016.09.067] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 08/26/2016] [Accepted: 09/29/2016] [Indexed: 02/04/2023] Open
Abstract
Zebra finches are an excellent model to study the process of vocal learning, a complex socially-learned tool of communication that forms the basis of spoken human language. So far, structural investigation of the zebra finch brain has been performed ex vivo using invasive methods such as histology. These methods are highly specific, however, they strongly interfere with performing whole-brain analyses and exclude longitudinal studies aimed at establishing causal correlations between neuroplastic events and specific behavioral performances. Therefore, the aim of the current study was to implement an in vivo Diffusion Tensor Imaging (DTI) protocol sensitive enough to detect structural sex differences in the adult zebra finch brain. Voxel-wise comparison of male and female DTI parameter maps shows clear differences in several components of the song control system (i.e. Area X surroundings, the high vocal center (HVC) and the lateral magnocellular nucleus of the anterior nidopallium (LMAN)), which corroborate previous findings and are in line with the clear behavioral difference as only males sing. Furthermore, to obtain additional insights into the 3-dimensional organization of the zebra finch brain and clarify findings obtained by the in vivo study, ex vivo DTI data of the male and female brain were acquired as well, using a recently established super-resolution reconstruction (SRR) imaging strategy. Interestingly, the SRR-DTI approach led to a marked reduction in acquisition time without interfering with the (spatial and angular) resolution and SNR which enabled to acquire a data set characterized by a 78μm isotropic resolution including 90 diffusion gradient directions within 44h of scanning time. Based on the reconstructed SRR-DTI maps, whole brain probabilistic Track Density Imaging (TDI) was performed for the purpose of super resolved track density imaging, further pushing the resolution up to 40μm isotropic. The DTI and TDI maps realized atlas-quality anatomical maps that enable a clear delineation of most components of the song control and auditory systems. In conclusion, this study paves the way for longitudinal in vivo and high-resolution ex vivo experiments aimed at disentangling neuroplastic events that characterize the critical period for vocal learning in zebra finch ontogeny.
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Affiliation(s)
- Julie Hamaide
- Bio-Imaging Lab, Department of Biomedical Sciences, University of Antwerp, Belgium
| | - Geert De Groof
- Bio-Imaging Lab, Department of Biomedical Sciences, University of Antwerp, Belgium
| | | | - Ben Jeurissen
- iMinds-Vision Lab, Department of Physics, University of Antwerp, Belgium
| | - Johan Van Audekerke
- Bio-Imaging Lab, Department of Biomedical Sciences, University of Antwerp, Belgium
| | - Maarten Naeyaert
- Bio-Imaging Lab, Department of Biomedical Sciences, University of Antwerp, Belgium
| | | | - Charlotte Cornil
- GIGA Neurosciences, Research Group in Behavioral Neuroendocrinology, University of Liège, Belgium
| | - Jan Sijbers
- iMinds-Vision Lab, Department of Physics, University of Antwerp, Belgium
| | - Marleen Verhoye
- Bio-Imaging Lab, Department of Biomedical Sciences, University of Antwerp, Belgium
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22
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Neuroplasticity and MRI: A perfect match. Neuroimage 2016; 131:13-28. [DOI: 10.1016/j.neuroimage.2015.08.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 08/03/2015] [Accepted: 08/03/2015] [Indexed: 12/21/2022] Open
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23
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Hanics J, Teleki G, Alpár A, Székely AD, Csillag A. Multiple amygdaloid divisions of arcopallium send convergent projections to the nucleus accumbens and neighboring subpallial amygdala regions in the domestic chicken: a selective pathway tracing and reconstruction study. Brain Struct Funct 2016; 222:301-315. [PMID: 27053075 PMCID: PMC5225175 DOI: 10.1007/s00429-016-1219-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 03/24/2016] [Indexed: 12/01/2022]
Abstract
Retrograde tracing with choleratoxin B, injected into the nucleus accumbens (Ac) and bed nucleus of stria terminalis, lateral part (BSTL), yielded labeled perikarya in a ring-shaped area of arcopallium, including dorsal and hilar subdivisions, with a wedge-shaped node of dense accumulation in the amygdalopiriform area (APir). Also, the position of source neurons for this arcopallio-subpallial pathway was verified by anterograde tracing. Three subregions of arcopallium (amygdalopiriform, dorsal, hilar) were injected with dextran (10 kDa), and fibers and terminal fields were detected in Ac, BSTL and extended amygdala (EA). Most abundant projections to Ac arose from APir. The study enabled precise description of the main output fiber streams: the dorsal stream follows the dorsal border of arcopallium and, continuing in the ventral amygdalofugal tract, it traverses the EA and the BSTL before reaching the Ac. The ventral stream of fibers enters the EA along the ventral subpallial border and terminates in the basal nucleus and ventral pallidum. The course of the pathway was reconstructed in 3D. Retrogradely labeled arcopallial neurons were devoid of DARPP-32. DARPP-32 was present in the Ac but not the BSTL. No colocalization between the calcium binding proteins calbindin, parvalbumin and calretinin, and retrogradely labeled neurons was detected, despite a considerable territorial overlap. This finding further supports the excitatory nature of the arcopallial-accumbens pathway. Conjoint and convergent amygdalar input to EA, including BSTL, as well as to Ac subregions likely transmits fear and aggression related signals to both viscerolimbic (EA) and learned reward- and motivation-related (Ac) ventrobasal forebrain regions.
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Affiliation(s)
- János Hanics
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, 58. Tuzolto utca, 1094, Budapest, Hungary.,MTA-SE NAP B Research Group of Experimental Neuroanatomy and Developmental Biology, Hungarian Academy of Sciences, Budapest, Hungary
| | - Gyöngyi Teleki
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, 58. Tuzolto utca, 1094, Budapest, Hungary
| | - Alán Alpár
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, 58. Tuzolto utca, 1094, Budapest, Hungary.,MTA-SE NAP B Research Group of Experimental Neuroanatomy and Developmental Biology, Hungarian Academy of Sciences, Budapest, Hungary
| | - Andrea D Székely
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, 58. Tuzolto utca, 1094, Budapest, Hungary
| | - András Csillag
- Department of Anatomy, Histology and Embryology, Faculty of Medicine, Semmelweis University, 58. Tuzolto utca, 1094, Budapest, Hungary.
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