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Elorriaga V, Pierani A, Causeret F. Cajal-retzius cells: Recent advances in identity and function. Curr Opin Neurobiol 2023; 79:102686. [PMID: 36774666 DOI: 10.1016/j.conb.2023.102686] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 12/29/2022] [Accepted: 01/08/2023] [Indexed: 02/12/2023]
Abstract
Cajal-Retzius cells (CRs) are a transient neuronal type of the developing cerebral cortex. Over the years, they have been shown or proposed to play important functions in neocortical and hippocampal morphogenesis, circuit formation, brain evolution and human pathology. Because of their short lifespan, CRs have been pictured as a purely developmental cell type, whose production and active elimination are both required for correct brain development. In this review, we present some of the findings that allow us to better appreciate the identity and diversity of this very special cell type, and propose a unified definition of what should be considered a Cajal-Retzius cell, especially when working with non-mammalian species or organoids. In addition, we highlight a flurry of recent studies pointing to the importance of CRs in the assembly of functional and dysfunctional cortical networks.
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Affiliation(s)
- Vicente Elorriaga
- Université Paris Cité, Imagine Institute, Team Genetics and Development of the Cerebral Cortex, F-75015 Paris, France; Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, F-75014 Paris, France
| | - Alessandra Pierani
- Université Paris Cité, Imagine Institute, Team Genetics and Development of the Cerebral Cortex, F-75015 Paris, France; Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, F-75014 Paris, France; GHU-Paris Psychiatrie et Neurosciences, Hôpital Sainte Anne, F-75014 Paris, France.
| | - Frédéric Causeret
- Université Paris Cité, Imagine Institute, Team Genetics and Development of the Cerebral Cortex, F-75015 Paris, France; Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, F-75014 Paris, France.
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Almeida L, Andreu-Fernández V, Navarro-Tapia E, Aras-López R, Serra-Delgado M, Martínez L, García-Algar O, Gómez-Roig MD. Murine Models for the Study of Fetal Alcohol Spectrum Disorders: An Overview. Front Pediatr 2020; 8:359. [PMID: 32760684 PMCID: PMC7373736 DOI: 10.3389/fped.2020.00359] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 05/29/2020] [Indexed: 12/15/2022] Open
Abstract
Prenatal alcohol exposure is associated to different physical, behavioral, cognitive, and neurological impairments collectively known as fetal alcohol spectrum disorder. The underlying mechanisms of ethanol toxicity are not completely understood. Experimental studies during human pregnancy to identify new diagnostic biomarkers are difficult to carry out beyond genetic or epigenetic analyses in biological matrices. Therefore, animal models are a useful tool to study the teratogenic effects of alcohol on the central nervous system and analyze the benefits of promising therapies. Animal models of alcohol spectrum disorder allow the analysis of key variables such as amount, timing and frequency of ethanol consumption to describe the harmful effects of prenatal alcohol exposure. In this review, we aim to synthetize neurodevelopmental disabilities in rodent fetal alcohol spectrum disorder phenotypes, considering facial dysmorphology and fetal growth restriction. We examine the different neurodevelopmental stages based on the most consistently implicated epigenetic mechanisms, cell types and molecular pathways, and assess the advantages and disadvantages of murine models in the study of fetal alcohol spectrum disorder, the different routes of alcohol administration, and alcohol consumption patterns applied to rodents. Finally, we analyze a wide range of phenotypic features to identify fetal alcohol spectrum disorder phenotypes in murine models, exploring facial dysmorphology, neurodevelopmental deficits, and growth restriction, as well as the methodologies used to evaluate behavioral and anatomical alterations produced by prenatal alcohol exposure in rodents.
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Affiliation(s)
- Laura Almeida
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- Fundació Sant Joan de Déu, Barcelona, Spain
- BCNatal Barcelona Center for Maternal Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Barcelona, Spain
| | - Vicente Andreu-Fernández
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- Nutrition and Health Deparment, Valencian International University (VIU), Valencia, Spain
- Grup de Recerca Infancia i Entorn (GRIE), Institut D'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Elisabet Navarro-Tapia
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- BCNatal Barcelona Center for Maternal Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Barcelona, Spain
- Grup de Recerca Infancia i Entorn (GRIE), Institut D'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Rosa Aras-López
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- Congenital Malformations Lab, Institute of Medicine and Molecular Genetic (INGEMM), Institute for Health Research of La Paz Universitary Hospital (IdiPAZ), Madrid, Spain
| | - Mariona Serra-Delgado
- BCNatal Barcelona Center for Maternal Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Barcelona, Spain
| | - Leopoldo Martínez
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- Congenital Malformations Lab, Institute of Medicine and Molecular Genetic (INGEMM), Institute for Health Research of La Paz Universitary Hospital (IdiPAZ), Madrid, Spain
- Department of Pediatric Surgery, Hospital Universitario La Paz, Madrid, Spain
| | - Oscar García-Algar
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- Grup de Recerca Infancia i Entorn (GRIE), Institut D'investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Department of Neonatology, Hospital Clínic-Maternitat, ICGON, IDIBAPS, BCNatal, Barcelona, Spain
| | - María Dolores Gómez-Roig
- Maternal and Child Health and Development Network II (SAMID II), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
- Fundació Sant Joan de Déu, Barcelona, Spain
- BCNatal Barcelona Center for Maternal Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Barcelona, Spain
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Shin JE, Lee H, Jung K, Kim M, Hwang K, Han J, Lim J, Kim IS, Lim KI, Park KI. Cellular Response of Ventricular-Subventricular Neural Progenitor/Stem Cells to Neonatal Hypoxic-Ischemic Brain Injury and Their Enhanced Neurogenesis. Yonsei Med J 2020; 61:492-505. [PMID: 32469173 PMCID: PMC7256006 DOI: 10.3349/ymj.2020.61.6.492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 04/10/2020] [Accepted: 04/18/2020] [Indexed: 12/12/2022] Open
Abstract
PURPOSE To elucidate the brain's intrinsic response to injury, we tracked the response of neural stem/progenitor cells (NSPCs) located in ventricular-subventricular zone (V-SVZ) to hypoxic-ischemic brain injury (HI). We also evaluated whether transduction of V-SVZ NSPCs with neurogenic factor NeuroD1 could enhance their neurogenesis in HI. MATERIALS AND METHODS Unilateral HI was induced in ICR neonatal mice. To label proliferative V-SVZ NSPCs in response to HI, bromodeoxyuridine (BrdU) and retroviral particles encoding LacZ or NeuroD1/GFP were injected. The cellular responses of NSPCs were analyzed by immunohistochemistry. RESULTS Unilateral HI increased the number of BrdU+ newly-born cells in the V-SVZ ipsilateral to the lesion while injury reduced the number of newly-born cells reaching the ipsilateral olfactory bulb, which is the programmed destination of migratory V-SVZ NSPCs in the intact brain. These newly-born cells were directed from this pathway towards the lesions. HI significantly increased the number of newly-born cells in the cortex and striatum by the altered migration of V-SVZ cells. Many of these newly-born cells differentiated into active neurons and glia. LacZ-expressing V-SVZ NSPCs also showed extensive migration towards the non-neurogenic regions ipsilateral to the lesion, and expressed the neuronal marker NeuN. NeuroD1+/GFP+ V-SVZ NSPCs almost differentiated into neurons in the peri-infarct regions. CONCLUSION HI promotes the establishment of a substantial number of new neurons in non-neurogenic regions, suggesting intrinsic repair mechanisms of the brain, by controlling the behavior of endogenous NSPCs. The activation of NeuroD1 expression may improve the therapeutic potential of endogenous NSPCs by increasing their neuronal differentiation in HI.
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Affiliation(s)
- Jeong Eun Shin
- Division of Neonatology, Severance Children's Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea
| | - Haejin Lee
- Yonsei Biomedical Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Kwangsoo Jung
- Division of Neonatology, Severance Children's Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea
| | - Miri Kim
- Yonsei Biomedical Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Kyujin Hwang
- Brain Korea 21 Plus Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Jungho Han
- Division of Neonatology, Severance Children's Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea
| | - Joohee Lim
- Division of Neonatology, Severance Children's Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea
| | - Il Sun Kim
- Division of Neonatology, Severance Children's Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea
| | - Kwang Il Lim
- Department of Chemical and Biological Engineering, Sookmyung Women's University, Seoul, Korea
| | - Kook In Park
- Division of Neonatology, Severance Children's Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea
- Yonsei Biomedical Research Institute, Yonsei University College of Medicine, Seoul, Korea
- Brain Korea 21 Plus Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
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Prume M, Rollenhagen A, Lübke JHR. Structural and Synaptic Organization of the Adult Reeler Mouse Somatosensory Neocortex: A Comparative Fine-Scale Electron Microscopic Study of Reeler With Wild Type Mice. Front Neuroanat 2018; 12:80. [PMID: 30344480 PMCID: PMC6182073 DOI: 10.3389/fnana.2018.00080] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 09/13/2018] [Indexed: 11/17/2022] Open
Abstract
The reeler mouse has been widely used to study various aspects of cortico- and synaptogenesis, but also as a model for several neurological and neurodegenerative disorders. In contrast to development, comparably little is known about the neuronal composition and synaptic organization of the adult reeler mouse neocortex, in particular at the fine-scale electron microscopic level, which was investigated here and compared with wild type (WT) mice. In this study, the “barrel field” of the adult reeler and WT mouse somatosensory neocortex is used as a model system. In reeler the characteristic six-layered structure is no longer existent, but replaced by a conglomerate of neurons organized in homologous clusters with maintained morphological identity and heterologous clusters between neurons and/or oligodendrocytes. These clusters are loosely scattered throughout the neocortical mass between the pial surface and the white matter. In contrast to WT, layer 1 (L1), if existent, seems to be diluted into the volume of the neocortical mass with no clear boundary. L1 also contains clusters of migrated or persistent neurons, oligodendro- and astrocytes. As in WT, myelinated and unmyelinated axons were found throughout the neocortical mass, but in reeler they were organized in massive fiber bundles with a high fiber packing density. A prominent and massive thalamocortical projection traverses through the neocortical mass, always accompanied by numerous “active” oligodendrocytes whereas in WT no such projections were found and “silent” oligodendrocytes were restricted to the white matter. In the adult reeler mouse neocortex, synaptic boutons terminate on somata, dendritic shafts, spines of different types and axon initial segments with no signs of structural distortion and/or degeneration, indicating a “normal” postsynaptic innervation pattern of neurons. In addition, synaptic complexes between boutons and their postsynaptic targets are tightly ensheathed by fine astrocytic processes, as in WT. In conclusion, the neuronal clusters may represent a possible alternative organization principle in adult reeler mice “replacing” layer formation. If so, these homologous clusters may represent individual “functional units” where neurons are highly interconnected and may function as the equivalent of neurons integrated in a cortical layer. The structural composition and postsynaptic innervation pattern of neurons by synaptic boutons provide the structural basis for the establishment of a functional although altered cortical network in the adult reeler mouse.
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Affiliation(s)
- Miriam Prume
- Institute of Neuroscience and Medicine INM-10, Research Centre Jülich GmbH, Jülich, Germany
| | - Astrid Rollenhagen
- Institute of Neuroscience and Medicine INM-10, Research Centre Jülich GmbH, Jülich, Germany
| | - Joachim H R Lübke
- Institute of Neuroscience and Medicine INM-10, Research Centre Jülich GmbH, Jülich, Germany.,Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, RWTH University Hospital Aachen, Aachen, Germany.,JARA Translational Brain Medicine, Jülich, Germany
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Semaphorin 7A as a Potential Therapeutic Target for Multiple Sclerosis. Mol Neurobiol 2016; 54:4820-4831. [DOI: 10.1007/s12035-016-0154-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 09/22/2016] [Indexed: 10/20/2022]
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Barber M, Pierani A. Tangential migration of glutamatergic neurons and cortical patterning during development: Lessons from Cajal-Retzius cells. Dev Neurobiol 2015; 76:847-81. [PMID: 26581033 DOI: 10.1002/dneu.22363] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/12/2015] [Accepted: 11/13/2015] [Indexed: 12/14/2022]
Abstract
Tangential migration is a mode of cell movement, which in the developing cerebral cortex, is defined by displacement parallel to the ventricular surface and orthogonal to the radial glial fibers. This mode of long-range migration is a strategy by which distinct neuronal classes generated from spatially and molecularly distinct origins can integrate to form appropriate neural circuits within the cortical plate. While it was previously believed that only GABAergic cortical interneurons migrate tangentially from their origins in the subpallial ganglionic eminences to integrate in the cortical plate, it is now known that transient populations of glutamatergic neurons also adopt this mode of migration. These include Cajal-Retzius cells (CRs), subplate neurons (SPs), and cortical plate transient neurons (CPTs), which have crucial roles in orchestrating the radial and tangential development of the embryonic cerebral cortex in a noncell-autonomous manner. While CRs have been extensively studied, it is only in the last decade that the molecular mechanisms governing their tangential migration have begun to be elucidated. To date, the mechanisms of SPs and CPTs tangential migration remain unknown. We therefore review the known signaling pathways, which regulate parameters of CRs migration including their motility, contact-redistribution and adhesion to the pial surface, and discuss this in the context of how CR migration may regulate their signaling activity in a spatial and temporal manner. © 2015 Wiley Periodicals, Inc. Develop Neurobiol 76: 847-881, 2016.
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Affiliation(s)
- Melissa Barber
- Institut Jacques-Monod, CNRS, Université Paris Diderot, Sorbonne Cité, Paris, France.,Department of Cell and Developmental Biology, University College London, WC1E 6BT, United Kingdom
| | - Alessandra Pierani
- Institut Jacques-Monod, CNRS, Université Paris Diderot, Sorbonne Cité, Paris, France
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Migration Speed of Cajal-Retzius Cells Modulated by Vesicular Trafficking Controls the Size of Higher-Order Cortical Areas. Curr Biol 2015; 25:2466-78. [DOI: 10.1016/j.cub.2015.08.028] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 07/01/2015] [Accepted: 08/13/2015] [Indexed: 11/19/2022]
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Liu R, Yang Y, Shen J, Chen H, Zhang Q, Ba R, Wei Y, Li KC, Zhang X, Zhao C. Fstl1 is involved in the regulation of radial glial scaffold development. Mol Brain 2015; 8:53. [PMID: 26382033 PMCID: PMC4573935 DOI: 10.1186/s13041-015-0144-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 08/28/2015] [Indexed: 11/10/2022] Open
Abstract
Background Radial glial cells (RGCs), the instructive scaffolds for neuronal migration, are well characterized by their unique morphology and polarization; these cells extend elongated basal processes to the pial basement membrane (BM) and parallel to one another. However, little is known about the mechanisms that underlie the developmental regulation and maintenance of this unique morphology. Results Here, by crossing Fstl1fl/fl mice with an EIIa-Cre line, we identified a new role for the secreted glycoprotein Follistatin like-1 (FSTL1). The ablation of Fstl1 in both of its cortical expression domains, the ventricular zone (VZ) and the pia mater, resulted in RGC morphologic disruption; basal processes were not parallel to each other, and endfeet exhibited greater density and branching. However, Fstl1 deletion in only the VZ in the Emx1IREScre; Fstl1fl/fl line did not affect RGC morphology, indicating that FSTL1 derived from the pia mater might be more important for RGC morphology. In addition, upper-layer projection neurons, not deeper-layer projection neurons, failed to reach their appropriate positions. We also found that BMP, AKT/PKB, Cdc42, GSK3β, integrin and reelin signals, which have previously been reported to regulate RGC development, were unchanged, indicating that Fstl1 may function through a unique mechanism. Conclusions In the present study, we identified a new role for FSTL1 in the development of radial glial scaffolds and the neuronal migration of upper-layer projection neurons. Our findings will improve understanding of the regulation of RGC development and neuronal migration. Electronic supplementary material The online version of this article (doi:10.1186/s13041-015-0144-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rui Liu
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - Yang Yang
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - Junhui Shen
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - He Chen
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - Qianqian Zhang
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - Ru Ba
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - Yongjie Wei
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China.
| | - Kai-Cheng Li
- Institute of Neuroscience and State Key Laboratory of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
| | - Xu Zhang
- Institute of Neuroscience and State Key Laboratory of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
| | - Chunjie Zhao
- Key Laboratory of Developmental Genes and Human Diseases, MOE, Department of Anatomy and Neuroscience, Medical School, Southeast University, Nanjing, 210009, China. .,Center of Depression, Beijing Institute for Brain Disorders, Beijing, 100069, China.
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Xie YJ, Zhou L, Jiang N, Zhang N, Zou N, Zhou L, Wang Y, Cowell JK, Shen Y. Essential roles of leucine-rich glioma inactivated 1 in the development of embryonic and postnatal cerebellum. Sci Rep 2015; 5:7827. [PMID: 25591666 PMCID: PMC4296302 DOI: 10.1038/srep07827] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Accepted: 12/12/2014] [Indexed: 11/24/2022] Open
Abstract
Leucine-rich glioma inactivated 1 (LGI1) is a secreted protein that interacts with ADAM transmembrane proteins, and its mutations are linked to human epilepsy. The function of LGI1 in CNS development remains undefined. Here, we report novel functions of LGI1 in the generation of cerebellar granule precursors (CGPs) and differentiation of radial glial cells (RGCs) in the cerebellum. A reduction in external granule layer thickness and defects in foliation were seen in embryonic and new-born LGI1 knockout (KO) mice. BrdU staining showed an inhibited proliferation of CGPs in KO embryos, which might be explained by the reduced Sonic hedgehog in embryos. In addition, the differentiation of RGCs into Bergmann glias was suppressed in KO mice. Enhanced Jagged1-Notch1 signaling in KO mice via reduced β-secretase proteolysis suggests that altered phenotype of RGCs is due to abnormal Notch1 signaling. Together, our results demonstrate that LGI1 is an essential player in the cerebellar development.
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Affiliation(s)
- Ya-Jun Xie
- Department of Neurobiology, Key Laboratory of Medical Neurobiology of the Ministry of Health, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Liang Zhou
- Department of Neurobiology, Key Laboratory of Medical Neurobiology of the Ministry of Health, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Nanwei Jiang
- Zhejiang Provincial Key Laboratory of Pathophysiology, Department of Physiology and Pharmacology, Ningbo University School of Medicine, Ningbo, China
| | - Nan Zhang
- Ningxia Key Laboratory of Cerebrocranial Diseases, Ningxia Medical University, Yinchuan, China
| | - Na Zou
- Department of Neurobiology, Key Laboratory of Medical Neurobiology of the Ministry of Health, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Lin Zhou
- Department of Neurobiology, Key Laboratory of Medical Neurobiology of the Ministry of Health, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Yin Wang
- Ningxia Key Laboratory of Cerebrocranial Diseases, Ningxia Medical University, Yinchuan, China
| | - John K Cowell
- Georgia Regents University, Cancer Center, Augusta, GA, USA
| | - Ying Shen
- Department of Neurobiology, Key Laboratory of Medical Neurobiology of the Ministry of Health, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
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Buffo A, Rossi F. Origin, lineage and function of cerebellar glia. Prog Neurobiol 2013; 109:42-63. [PMID: 23981535 DOI: 10.1016/j.pneurobio.2013.08.001] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 08/06/2013] [Accepted: 08/07/2013] [Indexed: 11/16/2022]
Abstract
The glial cells of the cerebellum, and particularly astrocytes and oligodendrocytes, are characterized by a remarkable phenotypic variety, in which highly peculiar morphological features are associated with specific functional features, unique among the glial cells of the entire CNS. Here, we provide a critical report about the present knowledge of the development of cerebellar glia, including lineage relationships between cerebellar neurons, astrocytes and oligodendrocytes, the origins and the genesis of the repertoire of glial types, and the processes underlying their acquisition of mature morphological and functional traits. In parallel, we describe and discuss some fundamental roles played by specific categories of glial cells during cerebellar development. In particular, we propose that Bergmann glia exerts a crucial scaffolding activity that, together with the organizing function of Purkinje cells, is necessary to achieve the normal pattern of foliation and layering of the cerebellar cortex. Moreover, we discuss some of the functional tasks of cerebellar astrocytes and oligodendrocytes that are distinctive of cerebellar glia throughout the CNS. Notably, we report about the regulation of synaptic signalling in the molecular and granular layer mediated by Bergmann glia and parenchymal astrocytes, and the functional interaction between oligodendrocyte precursor cells and neurons. On the whole, this review provides an extensive overview of the available literature and some novel insights about the origin and differentiation of the variety of cerebellar glial cells and their function in the developing and mature cerebellum.
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Affiliation(s)
- Annalisa Buffo
- Rita Levi-Montalcini Department of Neuroscience, University of Turin, Corso Raffaello, 30, 10125 Turin, Italy; Neuroscience Institute Cavalieri Ottolenghi, Neuroscience Institute of Turin, University of Turin, Regione Gonzole 10, 10043 Orbassano, Turin, Italy.
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Kuang Y, Liu Q, Shu X, Zhang C, Huang N, Li J, Jiang M, Li H. Dicer1 and MiR-9 are required for proper Notch1 signaling and the Bergmann glial phenotype in the developing mouse cerebellum. Glia 2012; 60:1734-46. [PMID: 22836445 DOI: 10.1002/glia.22392] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Accepted: 06/26/2012] [Indexed: 12/22/2022]
Abstract
MicroRNAs (miRNAs) have important roles in the development of the central nervous system (CNS). Several reports indicate that tissue development and cellular differentiation in the developing forebrain are disrupted in the absence of miRNAs. However, the functions of miRNAs during cerebellar development have not been systematically characterized. Here, we conditionally knocked out the Dicer1 gene under the control of the human glial fibrillary acidic protein (hGFAP) promoter to examine the effect of miRNAs in the developing cerebellum. We particularly focused on the phenotype of Bergmann glia (BG). The hGFAP-Cre activity was detected as early as embryonic day 13.5 (E13.5) at the rhombic lip (RL) in the cerebellar plate, and later in several postnatal cerebellar cell types, including BG. Dicer1 ablation induces a smaller and less developed cerebellum, accompanied by aberrant BG morphology. Notch1 signaling appears to be blocked in Dicer1-ablated BG, with reduced expression of the Notch1 target gene, brain lipid binding protein (BLBP). Using neuronal co-culture assays, we showed an intrinsic effect of Dicer1 on BG morphology and Notch1 target gene expression. We further identified miR-9 as being differentially expressed in BG and showed that miR-9 is a critical, but not the only, miRNA component of the Notch1 signaling pathway in cultured BG cells.
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Affiliation(s)
- Yi Kuang
- West China Developmental and Stem Cell Institute, West China Second University Hospital, Sichuan University, Chengdu, People's Republic of China
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Emsley JG, Menezes JRL, Madeiro Da Costa RF, Martinez AMB, Macklis JD. Identification of radial glia-like cells in the adult mouse olfactory bulb. Exp Neurol 2012; 236:283-97. [PMID: 22634209 DOI: 10.1016/j.expneurol.2012.05.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 04/18/2012] [Accepted: 05/12/2012] [Indexed: 01/08/2023]
Abstract
Immature neurons migrate tangentially within the rostral migratory stream (RMS) to the adult olfactory bulb (OB), then radially to their final positions as granule and periglomerular neurons; the controls over this transition are not well understood. Using adult transgenic mice with the human GFAP promoter driving expression of enhanced GFP, we identified a population of radial glia-like cells that we term adult olfactory radial glia-like cells (AORGs). AORGs have large, round somas and simple, radially oriented processes. Confocal reconstructions indicate that AORGs variably express typical radial glial markers, only rarely express mouse GFAP, and do not express astroglial, oligodendroglial, neuronal, or tanycyte markers. Electron microscopy provides further supporting evidence that AORGs are not immature neurons. Developmental analyses indicate that AORGs are present as early as P1, and are generated through adulthood. Tracing studies show that AORGs are not born in the SVZa, suggesting that they are born either in the RMS or the OB. Migrating immature neurons from the adult SVZa are closely apposed to AORGs during radial migration in vivo and in vitro. Taken together, these data indicate a newly-identified population of radial glia-like cells in the adult OB that might function uniquely in neuronal radial migration during adult OB neurogenesis.
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Affiliation(s)
- Jason G Emsley
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA 02138, USA
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13
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Xi C, Chen Q, Zeng SJ, Lin YT, Huang YF, Liu Y, Zhang XW, Zuo MX. Sites of origin and developmental dynamics of the neurons in the core and shell regions of torus semicircularis in the Chinese softshell turtle (Pelodiscus sinensis). J Comp Neurol 2011; 519:2677-96. [PMID: 21484802 DOI: 10.1002/cne.22646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
To know the embryogenesis of the core and shell regions of the midbrain auditory nucleus, a single dose of [(3)H]-thymidine was injected into the turtle embryos at peak stages of neurogenesis in the shell and core of the torus semicircularis. Following sequential survival times, labeled neurons and the dynamics of cell proliferation were examined. The expression of vimentin (VM), reelin, calbindin, parvalbumin, and substance P were also studied. The results showed that: 1) progenitor cells for the core and shell regions were generated in different sites of the ventricular zone; 2) the length of the cell cycle or S-phase for the shell region were both longer than those for the core region (4.7 and 3.2 hours longer, respectively), suggesting that mitotic activity in the core region is higher than it is in the shell region; 3) the elongated cell bodies of the labeled core and shell cells had close apposition to VM fibers, suggesting that the migration of these cells is guided by VM fibers; 4) the germinal sites of the core and shell constructed by projecting the orientation of radial VM fibers back to the ventricular zone was consistent with those obtained by short and sequential survival [(3)H]-thymidine radiography; and 5) the beginning of positive staining for parvalbumin in the core region was interposed between those for calbindin and substance P in the shell regions. This study contributes to the understanding of how auditory nuclei are organized and how their components developed and evolved.
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Affiliation(s)
- Chao Xi
- Key Laboratory for Cell Proliferation and Regulation Biology, Ministry of Education, Beijing Normal University, Beijing, China
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14
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Neuron-glia signaling: Implications for astrocyte differentiation and synapse formation. Life Sci 2011; 89:524-31. [PMID: 21569780 DOI: 10.1016/j.lfs.2011.04.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2010] [Revised: 03/10/2011] [Accepted: 04/09/2011] [Indexed: 11/22/2022]
Abstract
Glial cells are currently viewed as active partners of neurons in synapse formation. The close proximity of astrocytes to the synaptic cleft implicates that they strongly influence synapse function as well as suggests that these cells might be potential targets for neuronal-released molecules. In this review, we discuss the signaling pathways of astrocyte generation and the role of astrocyte-derived molecules in synapse formation in the central nervous system. Further, we discuss the role of the excitatory neurotransmitter, glutamate and transforming growth factor beta 1 (TGF-β1) pathway in astrocyte generation and differentiation. We provide evidence that astrocytes surrounding synapses are target of neuronal activity and shed light into the role of astroglial cells into neurological disorders associated with glutamate neurotoxicity.
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15
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Kwon HJ, Ma S, Huang Z. Radial glia regulate Cajal-Retzius cell positioning in the early embryonic cerebral cortex. Dev Biol 2010; 351:25-34. [PMID: 21185282 DOI: 10.1016/j.ydbio.2010.12.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 12/12/2010] [Accepted: 12/13/2010] [Indexed: 12/27/2022]
Abstract
The organization of neocortex, along its radial axis, into a six-layered structure is one of the most exquisite features of the brain. Because of their strategic localization in the marginal zone, and their expression of reelin, a signal that controls spatial ordering of cortical layers, Cajal-Retzius (C-R) cells play a crucial role in cortical patterning along this axis. Yet, it remains less well understood how C-R cell targeting itself is regulated. At the onset of corticogenesis when C-R cells first arrive in the cortex via tangential migration, radial glia (RG) are the main cell type present. This suggests that RG may play a role in C-R cell localization. To test this, we used genetic approaches to perturb RG scaffold during early corticogenesis. We found that disrupting RG endfoot adhesion to basal lamina consistently results in C-R cell displacement. These displacements do not appear to result from primary defects in neural progenitor cell proliferation, deficits in the meninges or basement membrane, or cell autonomous defects in C-R cells. Instead, they show close temporal and spatial correlation with RG endfoot retraction. Moreover, ablation of RG via cell cycle blockade similarly results in local displacement of C-R cells. These lines of evidence thus indicate that, during early corticogenesis, RG play a primary role in regulating spatial targeting of C-R cells. Since RG are also neural progenitors as well as neuronal migration scaffolds, these findings suggest that, during nervous system development, neuroepithelial stem cells may not only be responsible for generating a diverse array of neuronal cell types and facilitating their radial migration. They may also, through regulating the placement of guidepost cells, coordinate spatial patterning of the nervous system along its radial axis.
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Affiliation(s)
- Hyo Jun Kwon
- Neuroscience Training Program, University of Wisconsin, Madison, WI 53706, USA
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16
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Griveau A, Borello U, Causeret F, Tissir F, Boggetto N, Karaz S, Pierani A. A novel role for Dbx1-derived Cajal-Retzius cells in early regionalization of the cerebral cortical neuroepithelium. PLoS Biol 2010; 8:e1000440. [PMID: 20668538 PMCID: PMC2910656 DOI: 10.1371/journal.pbio.1000440] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Accepted: 06/17/2010] [Indexed: 12/03/2022] Open
Abstract
Patterning of the cerebral cortex during embryogenesis depends not only on passive diffusion of morphogens but also on signal delivery by Cajal-Retzius neurons that migrate over long distances. Patterning of the cortical neuroepithelium occurs at early stages of embryonic development in response to secreted molecules from signaling centers. These signals have been shown to establish the graded expression of transcription factors in progenitors within the ventricular zone and to control the size and positioning of cortical areas. Cajal-Retzius (CR) cells are among the earliest generated cortical neurons and migrate from the borders of the developing pallium to cover the cortical primordium by E11.5. We show that molecularly distinct CR subtypes distribute in specific combinations in pallial territories at the time of cortical regionalization. By means of genetic ablation experiments in mice, we report that loss of septum Dbx1-derived CR cells in the rostromedial pallium between E10.5 and E11.5 results in the redistribution of CR subtypes. This leads to changes in the expression of transcription factors within the neuroepithelium and in the proliferation properties of medial and dorsal cortical progenitors. Early regionalization defects correlate with shifts in the positioning of cortical areas at postnatal stages in the absence of alterations of gene expression at signaling centers. We show that septum-derived CR neurons express a highly specific repertoire of signaling factors. Our results strongly suggest that these cells, migrating over long distances and positioned in the postmitotic compartment, signal to ventricular zone progenitors and, thus, function as modulators of early cortical patterning. Patterning of the cerebral cortex occurs early during embryonic development in response to secreted molecules or morphogens produced at signaling centers. These morphogens establish the graded expression of transcription factors (TFs) in progenitor cells and control the size and positioning of cortical areas in the postnatal animal. CR cells are among the earliest born cortical neurons and play a crucial role in cortical lamination. They are generated at signaling centers and migrate over long distances to cover its entire surface. We show that three different CR subtypes distribute in specific proportions in cortical territories. Genetic ablation of one subpopulation leads to a highly dynamic redistribution of the two others. This results in defects in expression of transcription factors and in progenitor cell proliferation, which correlate with the resulting changes in the size and positioning of cortical areas. Given our additional evidence that CR subtypes express specific repertoires of signaling factors, the ablation phenotypes point to a novel early role for CR cells as mediators of cortical patterning and suggest that CR cells are able to signal to progenitor cells. Our data thus add to the conventional model that morphogens act by passive diffusion and point to a strategy of morphogen delivery over long distance by migrating cells.
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Affiliation(s)
- Amélie Griveau
- CNRS-UMR 7592, Program of Development and Neurobiology, Institut Jacques Monod, Université Paris Diderot, Paris, France
| | - Ugo Borello
- CNRS-UMR 7592, Program of Development and Neurobiology, Institut Jacques Monod, Université Paris Diderot, Paris, France
| | - Frédéric Causeret
- CNRS-UMR 7592, Program of Development and Neurobiology, Institut Jacques Monod, Université Paris Diderot, Paris, France
| | - Fadel Tissir
- Developmental Neurobiology, Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
| | - Nicole Boggetto
- CNRS-UMR 7592, Program of Development and Neurobiology, Institut Jacques Monod, Université Paris Diderot, Paris, France
| | - Sonia Karaz
- CNRS-UMR 7592, Program of Development and Neurobiology, Institut Jacques Monod, Université Paris Diderot, Paris, France
| | - Alessandra Pierani
- CNRS-UMR 7592, Program of Development and Neurobiology, Institut Jacques Monod, Université Paris Diderot, Paris, France
- * E-mail:
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17
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Zimmer C, Lee J, Griveau A, Arber S, Pierani A, Garel S, Guillemot F. Role of Fgf8 signalling in the specification of rostral Cajal-Retzius cells. Development 2010; 137:293-302. [PMID: 20040495 PMCID: PMC2799162 DOI: 10.1242/dev.041178] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2009] [Indexed: 12/14/2022]
Abstract
Cajal-Retzius (CR) cells play a key role in the formation of the cerebral cortex. These pioneer neurons are distributed throughout the cortical marginal zone in distinct graded distributions. Fate mapping and cell lineage tracing studies have recently shown that CR cells arise from restricted domains of the pallial ventricular zone, which are associated with signalling centres involved in the early regionalisation of the telencephalic vesicles. In this study, we identified a subpopulation of CR cells in the rostral telencephalon that expresses Er81, a downstream target of Fgf8 signalling. We investigated the role of the rostral telencephalic patterning centre, which secretes FGF molecules, in the specification of these cells. Using pharmacological inhibitors and genetic inactivation of Fgf8, we showed that production of Fgf8 by the rostral telencephalic signalling centre is required for the specification of the Er81+ CR cell population. Moreover, the analysis of Fgf8 gain-of-function in cultivated mouse embryos and of Emx2 and Gli3 mutant embryos revealed that ectopic Fgf8 signalling promotes the generation of CR cells with a rostral phenotype from the dorsal pallium. These data showed that Fgf8 signalling is both required and sufficient to induce rostral CR cells. Together, our results shed light on the mechanisms specifying rostral CR cells and further emphasise the crucial role of telencephalic signalling centres in the generation of distinct CR cell populations.
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Affiliation(s)
- Céline Zimmer
- National Institute for Medical Research (NIMR), Medical Research Council (MRC), Department of Molecular Neurobiology, London NW7 1AA, UK
| | - Jun Lee
- Biozentrum, Department of Cell Biology, University of Basel, and Friedrich Miescher Institute for Biomedical Research, 4056 Basel, Switzerland
| | - Amélie Griveau
- Institut Jacques Monod, Program in Development and Neurobiology, CNRS UMR 7592 and Université Paris Diderot, Paris 75013, France
| | - Silvia Arber
- Biozentrum, Department of Cell Biology, University of Basel, and Friedrich Miescher Institute for Biomedical Research, 4056 Basel, Switzerland
| | - Alessandra Pierani
- Institut Jacques Monod, Program in Development and Neurobiology, CNRS UMR 7592 and Université Paris Diderot, Paris 75013, France
| | - Sonia Garel
- INSERM U784, Ecole Normale Supérieure, Département de Biologie, Paris 75005, France
| | - François Guillemot
- National Institute for Medical Research (NIMR), Medical Research Council (MRC), Department of Molecular Neurobiology, London NW7 1AA, UK
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18
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Abstract
Radial glial cells (RGCs) in the developing cerebral cortex are progenitors for neurons and glia, and their processes serve as guideposts for migrating neurons. So far, it has remained unclear whether RGC processes also control the function of RGCs more directly. Here, we show that RGC numbers and cortical size are reduced in mice lacking beta1 integrins in RGCs. TUNEL stainings and time-lapse video recordings demonstrate that beta1-deficient RGCs processes detach from the meningeal basement membrane (BM) followed by apoptotic death of RGCs. Apoptosis is also induced by surgical removal of the meninges. Finally, mice lacking the BM components laminin alpha2 and alpha4 show defects in the attachment of RGC processes at the meninges, a reduction in cortical size, and enhanced apoptosis of RGC cells. Our findings demonstrate that attachment of RGC processes at the meninges is important for RGC survival and the control of cortical size.
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19
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Molecular regulation of neuronal migration during neocortical development. Mol Cell Neurosci 2009; 42:11-22. [PMID: 19523518 DOI: 10.1016/j.mcn.2009.06.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 06/03/2009] [Indexed: 11/21/2022] Open
Abstract
Neocortex, a distinct six-layered neural structure, is one of the most exquisite nerve tissues in the human body. Proper assembly of neocortex requires precise regulation of neuronal migration and abnormalities can result in severe neurological diseases. Three major types of neuronal migration have been implicated in corticogenesis: radial migration of excitatory neuron precursors and tangential migration of interneurons as well as Cajal-Retzius cells. In the past several years, significant progress has been made in understanding how these parallel events are regulated and coordinated during corticogenesis. New insights have been gained into regulation of radial neuron migration by the well-known Reelin signal. New pathways have also been identified that regulate radial as well as tangential migration. Equally important, better understandings have been obtained on the cellular and molecular mechanics of cell migration by both projection neurons and interneurons. These findings have not only enhanced our understanding of normal neuron migration but also revealed insights into the etiologies of several neurological diseases where these processes go awry.
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20
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Kim JH, Lee MR, Kim JH, Jee MK, Kang SK. IFATS collection: Selenium induces improvement of stem cell behaviors in human adipose-tissue stromal cells via SAPK/JNK and stemness acting signals. Stem Cells 2008; 26:2724-34. [PMID: 18583539 DOI: 10.1634/stemcells.2008-0184] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the present study, the potential of selenium to enhance stem cell behavior through improvement of human adipose tissue-derived stromal cells (ATSCs) and the associated molecular mechanism was evaluated. Selenium-induced improvement in stem cell behavior of human ATSCs caused expression of several genes, indicating downregulated mature cell marker proteins coupled with increased cell growth and telomerase activities after the overexpression of Rex1, Nanog, OCT4, SOX2, KLF4, and c-Myc. Also, selenium-treated ATSCs significantly downregulated p53 and p21 tumor suppressor gene products. Selenium induced active growth and growth enhanced by the activation of signal proteins in ATSCs via the inhibition of reactive oxygen species-mediated phospho-stress-activated protein kinase/c-Jun N-terminal protein kinase activation. The selenium-induced activation of extracellular regulated kinases 1/2 and Akt in ATSCs resulted in a subsequent induction of the expression of stemness transcription factors, particularly Rex1, Nanog, and Oct4, along with definitive demethylation on regulatory regions of Rex-1, Nanog, and Oct4. The results of our small interfering RNA knockdown experiment showed that Rex1 plays a major role in the proliferation of selenium-induced ATSCs. Selenium-treated ATSCs also exhibited more profound differentiation into mesodermal and neural lineages. We performed a direct comparison of gene expression profiles in control ATSCs and selenium-treated ATSCs and delineated specific members of important growth factor, signaling, cell adhesion, and transcription factor families. The observations of improved life span and multipotency of selenium-treated ATSCs clearly indicate that selenium-treated ATSCs represent an extraordinarily useful candidate cell source for tissue regeneration. Disclosure of potential conflicts of interest is found at the end of this article.
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Affiliation(s)
- Jeong Hwan Kim
- Department of Physiology, College of Medicine, Pusan National University, Busan, South Korea
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21
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Schaefer A, Poluch S, Juliano S. Reelin is essential for neuronal migration but not for radial glial elongation in neonatal ferret cortex. Dev Neurobiol 2008; 68:590-604. [PMID: 18264995 DOI: 10.1002/dneu.20601] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Numerous functions related to neuronal migration are linked to the glycoprotein reelin. Reelin also elongates radial glia, which are disrupted in mutant reeler mice. Our lab developed a model of cortical dysplasia in ferrets that shares features with the reeler mouse, including impaired migration of neurons into the cerebral cortex and disrupted radial glia. Explants of normal ferret cortex in coculture with dysplastic ferret cortex restore the deficits in this model. To determine if reelin is integral to the repair, we used explants of P0 mouse cortex either of the wild type (WT) or heterozygous (het) for the reelin gene, as well as P0 reeler cortex (not containing reelin), in coculture with organotypic cultures of dysplastic ferret cortex. This arrangement revealed that all types of mouse cortical explants (WT, het, reeler) elongated radial glia in ferret cortical dysplasia, indicating that reelin is not required for proper radial glial morphology. Migration of cells into ferret neocortex, however, did not improve with explants of reeler cortex, but was almost normal after pairing with WT or het explants. We also placed an exogenous source of reelin in ferret cultures at the pial surface to reveal that migrating cells move toward the reelin source in dysplastic cortex; radial glia in these cultures were also improved toward normal. Our results demonstrate that the normotopic position of reelin is important for proper neuronal positioning, and that reelin is capable of elongating radial glial cells but is not the only radialization factor.
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Abstract
Malignant primary brain tumors, gliomas, often overexpress both platelet-derived growth factor (PDGF) ligands and receptors providing an autocrine and/or paracrine boost to tumor growth. Glioblastoma multiforme (GBM) is the most frequent glioma. Its aggressive and infiltrative growth renders it extremely difficult to treat. Median survival after diagnosis is currently only 12-14 months. The present review describes the use of retroviral tagging to identify candidate cancer-causing genes that cooperate with PDGF in brain tumor formation. Newborn mice injected intracerebrally with a Moloney murine leukemia retrovirus carrying the sis/PDGF-B oncogene and a replication competent helper virus developed brain tumors with many characteristics of human gliomas. Analysis of proviral integrations in the brain tumors identified almost 70 common insertion sites (CISs). These CISs were named brain tumor loci and harbored known but also putative novel cancer-causing genes. Microarray analysis identified differentially expressed genes in the mouse brain tumors compared to normal brain. Known tumor genes and markers of immature cells were upregulated in the tumors. Tumors developed 13-42 weeks after injection and short latency tumors were further distinguished as fast growing and GBM-like. Long latency tumors resembled slow-growing oligodendrogliomas and contained significantly less integrations as compared to short latency tumors. Several candidate genes tagged in this retroviral screen have known functions in neoplastic transformation and oncogenesis. Some candidates with a previously unknown function in tumorigenesis were found and their putative role in brain tumor formation will be discussed in this review. The results show that proviral tagging may be a useful tool in the search for candidate glioma genes.
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23
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Badea A, Nicholls PJ, Johnson GA, Wetsel WC. Neuroanatomical phenotypes in the reeler mouse. Neuroimage 2006; 34:1363-74. [PMID: 17185001 PMCID: PMC1945208 DOI: 10.1016/j.neuroimage.2006.09.053] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2006] [Revised: 09/13/2006] [Accepted: 09/18/2006] [Indexed: 11/29/2022] Open
Abstract
The reeler mouse (Reln) has been proposed as a neurodevelopmental model for certain neurological and psychiatric conditions and has been studied by qualitative histochemistry and electron microscopy. Using magnetic resonance microscopy (MRM), we have quantitated for the first time the neuromorphology of Reln mice at a resolution of 21.5 microm. The neuroanatomical phenotypes of heterozygous and homozygous mutant Reln mice were compared to those of wild type (WT) littermates using morphometry and texture analysis. The cortical, hippocampal, and cerebellar phenotypes of the heterozygous and homozygous mutant Reln mice were confirmed, and new features were revealed. The Reln(rl/rl) mice possessed a smaller brain, and both Reln(rl/+) and Reln(rl/rl) mice had increased ventricles compared to WT controls. Shape differences were found between WT and Reln(rl/rl) brains, specifically in cerebellum, olfactory bulbs, dorsomedial frontal and parietal cortex, certain regions of temporal and occipital lobes, as well as in the lateral ventricles and ventral hippocampus. These findings suggest that certain brain regions may be more severely impacted by the Reln mutation than others. Gadolinium-based active staining demonstrated that layers of the hippocampus were disorganized in Reln(rl/rl) mice and differences in thickness of these layers were identified between WT and Reln(rl/rl) mice. The intensity distributions characteristic to the dorsal, middle, and ventral hippocampus were altered in the Reln(rl/rl), especially in the ventral hippocampus. These differences were quantified using skewness and modeling the intensity distributions with a Gaussian mixture. Our results suggest that structural features of Reln(rl/rl) brain most closely phenocopy those of patients with Norman-Roberts lissencephaly.
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Affiliation(s)
- Alexandra Badea
- Center for In Vivo Microscopy, Duke University Medical Center, Durham, NC 27710, USA
| | - Peter J. Nicholls
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27710, USA
| | - G. Allan Johnson
- Center for In Vivo Microscopy, Duke University Medical Center, Durham, NC 27710, USA
| | - William C. Wetsel
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27710, USA
- Cell Biology, Mouse Behavioral and Neuroendocrine Analysis Core Facility, Duke University Medical Center, Durham, NC 27710, USA
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Abstract
Radial glial cells are astrocyte precursors, which are transiently present in the developing central nervous system and transform eventually into astrocytes in the cerebral cortex and into Bergmann glia in the cerebellum. Previous reports indicate that the transformation from radial glia to astrocytes can be reversed by diffusible chemical signals derived from embryonic forebrain in vitro and by freezing injury in vivo. But there is no direct evidence proving that mature astrocytes can de-differentiate into radial glial cells. Here we show that purified astrocytes could de-differentiate into radial glial-like cells (RGLCs) in vitro with freeze-thaw stimulation. RGLCs had the expression of markers for radial glia including Nestin and Pax6, and astrocyte markers, the glial fibrillary acidic protein and Vimentin. Cortical neurons, when co-cultured with RGLCs, migrated along the processes of RGLCs at an average speed of 26.26 +/- 3.36 microm/h. Moreover, the proliferation of RGLCs was significantly promoted by epidermal growth factor (EGF) at the concentration of 10-30 ng/ml. These results reveal that low temperature induces astrocytes to de-differentiate into immature RGLCs, which provides an in vitro model to investigate mechanisms of astroglial cells de-differentiation.
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Affiliation(s)
- Tao Yu
- Department of Neuropharmacology, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, PR China
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25
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Casanova MF, Switala AE, Trippe J. A Comparison Study of the Vertical Bias of Pyramidal Cells in the Hippocampus and Neocortex. Dev Neurosci 2006; 29:193-200. [PMID: 17148961 DOI: 10.1159/000096223] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Accepted: 04/19/2006] [Indexed: 11/19/2022] Open
Abstract
In this study, we employed morphometric image analysis of the hippocampus proper and temporal lobe neocortex in postmortem tissue to determine vertical bias quantified as Deltatheta, angular dispersion, as well asan index of alignment of cellular elements relative to the radial plane. The radial alignment of cellular elements was consistent with a minicolumnar organization of the cortex. Photomicrographs were taken of the left-hemisphere hippocampal CA3/1 subfields of 13 fetal subjects ranging in gestational age from 19 weeks to 36 weeks and 19 normal individuals aged 4 months to 98 years. For comparison, micrographs from the temporal lobe (Brodmann areas 21 and 22) were similarly processed for layers III and V, where the x-axes of the transformed coordinate system were taken to be the layer III/IV and IV/V borders, respectively. Computerized image analysis measurements of the angular dispersion for the temporal lobe region and hippocampus proper differed significantly within the same brains (p < 0.001). The neocortical layer III exhibited the highest values for Deltatheta, indicating a high degree of columnar organization. Values for Deltatheta in the hippocampal CA subfields were lower but demonstrated significance for the radial alignment of neurons in this area. Values for Deltathetain layer V were intermediate between those of layer III and the hippocampus, consistent with increasing degrees of radial columnar organization of infragranular layers of the neocortex in comparison with the hippocampus and of supragranular in comparison with infragranular neocortical layers. Pyramidal cell arrays within allocortical areas and the neocortex constitute different modular arrangements. This morphological variability may be the expression of evolutionary differences in cortical development.
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Affiliation(s)
- Manuel F Casanova
- Department of Psychiatry, University of Louisville, Louisville, KY 40292, USA.
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26
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Zhao T, Kraemer N, Oldekamp J, Cankaya M, Szabó N, Conrad S, Skutella T, Alvarez-Bolado G. Emx2 in the developing hippocampal fissure region. Eur J Neurosci 2006; 23:2895-907. [PMID: 16819978 DOI: 10.1111/j.1460-9568.2006.04819.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mice deficient in transcription factor gene Emx2 show developmental alterations in the hippocampal dentate gyrus. Emx2, however, is also expressed in the region around the developing hippocampal fissure. The developing fissure contains a radial glial scaffolding, and is surrounded by the outer marginal zone and the dentate marginal zone, which become specifically colonized by neurons and differentiate into stratum lacunosum-moleculare and molecular layer of the dentate, respectively. In this study we show that the Emx2 mutant lacks the glial scaffolding of the fissure and has an outer marginal zone (precursor of the stratum lacunosum-moleculare), as well as a dentate marginal zone severely reduced in size while most of the reelin (Reln)-expressing cells that should occupy it fail to be generated. We have also identified a subpopulation of hippocampal Reln-expressing cells of the marginal zone, probably born in the hem, expressing a specific combination of markers, and for which Emx2 is not essentially required. Additionally, we show differential mutant phenotypes of both Emx2 and Pax6 in neocortical vs. hippocampal Reln-expressing cells, indicating differential development of both subpopulations.
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Affiliation(s)
- Tianyu Zhao
- Max Planck Institute of Experimental Endocrinology, 30625 Hannover, Germany
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27
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Weller M, Krautler N, Mantei N, Suter U, Taylor V. Jagged1 ablation results in cerebellar granule cell migration defects and depletion of Bergmann glia. Dev Neurosci 2006; 28:70-80. [PMID: 16508305 DOI: 10.1159/000090754] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Accepted: 06/21/2005] [Indexed: 11/19/2022] Open
Abstract
Jagged1 is a ligand for members of the Notch family of receptors. Mutations in the human JAG1 gene are the major cause of Alagille syndrome, an autosomal dominant disorder affecting the liver, heart, eye, skeleton, kidneys, and craniofacial structures. Although expressed throughout mammalian embryonic development and in the adult, the function of Jagged1 in the central nervous system is not clear. Jagged1 is broadly expressed in the cerebellum suggesting an important role in Notch signaling. In order to address the function of Jagged1 in the mouse central nervous system, we have inactivated the Jag1 gene in the cerebellar primordium at mid-embryogenesis. Loss of Jagged1 results in aberrant granule cell migration and ectopic differentiation in the external germinal layer and molecular layer of the early postnatal cerebellum. We show that Bergmann glia in the cerebellum lose contact to the pial surface and have stunted processes. In vitro analysis revealed a depletion of Bergmann glia in the Jagged1 mutant mice. Our findings suggest that Jagged1 plays a role in cell fate specification and survival in the cerebellum.
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Affiliation(s)
- Mathias Weller
- Department of Molecular Embryology, Max Planck Institute of Immunobiology, Freiburg, Germany
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Yoshida M, Assimacopoulos S, Jones KR, Grove EA. Massive loss of Cajal-Retzius cells does not disrupt neocortical layer order. Development 2006; 133:537-45. [PMID: 16410414 DOI: 10.1242/dev.02209] [Citation(s) in RCA: 232] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Cajal-Retzius (CR) cells, the predominant source of reelin in developing neocortex, are thought to be essential for the inside out formation of neocortical layers. Fate mapping revealed that a large population of neocortical CR cells arises from the cortical hem. To investigate the function of CR cells, we therefore genetically ablated the hem. Neocortical CR cells were distributed beneath the pial surface in control mice, but were virtually absent in hem-ablated mice from embryonic day (E) 10.5 until birth. CR cells derived from other sources did not invade the neocortical primordium to compensate for hem loss. We predicted that neocortical layers would be inverted in hem-ablated animals, as in reeler mice, deficient in reelin signaling. Against expectation, layers showed the standard order. Low levels of reelin in the cortical primordium, or diffusion of reelin from other sites, may have allowed lamination to proceed. Our findings indicate, however, that the sheet of reelin-rich CR cells that covers the neocortical primordium is not required to direct layer order.
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Affiliation(s)
- Michio Yoshida
- Department of Neurobiology, Pharmacology and Physiology, University of Chicago, IL 60637, USA.
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29
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Aboitiz F, Montiel J, García RR. Ancestry of the mammalian preplate and its derivatives: evolutionary relicts or embryonic adaptations? Rev Neurosci 2006; 16:359-76. [PMID: 16519011 DOI: 10.1515/revneuro.2005.16.4.359] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Mammalian cortical development is preceded by the elaboration of a transient preplate, which is split into a superficial marginal zone and a deep subplate after the arrival of the cortical plate. There has been some controversy in the evolutionary interpretation of this transient structure, as some propose it to represent the ancestral cortex or pallium of non-mammals, while others consider it to be a phylogenetic novelty. The preplate and its derivatives contain components derived by both tangential and radial migration. Tangentially migrating elements include pioneer neurons and interneurons, both of subpallial origin, and Cajal-Retzius cells, mostly of pallial origin. Pioneer neurons were probably present in the ancestors of mammals, but may have changed their original superficial position to one below the developing cortex, thus attracting thalamic afferents in the subcortical white matter, and making them penetrate the cortex radially. In mammals, Cajal-Retzius cells appear to have increased both in number and on their level of reelin expression, perhaps in the context of controlling the final stages of migration in a radially expanding neoocortex. Radial-migrating cells are partly represented by the pyramidal-like cells of the subplate. These neurons resemble the excitatory elements of the adult reptilian cortex, but is not clear whether they are their true homologues. One possibility is that these cells appeared by virtue of a heterochronic process in which the earliest radial elements of the cortical plate began to be produced at progressively earlier developmental stages. Thus, we conclude that the mammalian preplate and its derivatives contain both ancestral and derived elements, all of which have been modified in the course of mammalian evolution to support an increasingly complex cortical plate development.
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Affiliation(s)
- Francisco Aboitiz
- Departamento de Psiquiatría, Escuela de Medicina, Pontificia Universidad Católica de Chile.
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30
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Gierdalski M, Sardi SP, Corfas G, Juliano SL. Endogenous neuregulin restores radial glia in a (ferret) model of cortical dysplasia. J Neurosci 2006; 25:8498-504. [PMID: 16162931 PMCID: PMC6725662 DOI: 10.1523/jneurosci.1476-05.2005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Radial glia are integral components of the developing neocortex. During corticogenesis, they form an important scaffold for neurons migrating into the cortical plate. Recent attention has focused on neuregulin (NRG1), acting through erbB receptors, in maintaining their morphology. We developed a model of developmental radial glial disruption by delivering an antimitotic [methylazoxy methanol (MAM)] to pregnant ferrets on embryonic day 24 (E24). We previously found that normal ferret cortex contains a soluble factor capable of realigning the disorganized radial glia back toward their normal morphology. Characterization of the reorganizing activity in normal cortex demonstrated that the probable factor mediating these responses was a 30-50 kDa protein. To test whether this endogenous soluble factor was NRG1, we used organotypic cultures of E24 MAM-treated ferret neocortex supplemented with the endogenous factor obtained from normal cortical implants, exogenous NRG1beta, antibodies that either blocked or stimulated erbB receptors, or a soluble erbB subtype that binds to available NRG1. We report that exogenous NRG1 or antibodies that stimulate erbB receptors dramatically improve the morphology of disrupted radial glia, whereas blockade of NRG1-erbB signaling prevents the radial glial repair. Our results suggest that NRG1 is an endogenous factor in ferret neocortex capable of repairing damaged radial glia and that it acts via one or more erbB receptors.
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Affiliation(s)
- Marcin Gierdalski
- Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814, USA
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31
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Baloyannis SJ. Morphological and morphometric alterations of Cajal-Retzius cells in early cases of Alzheimer's disease: a Golgi and electron microscope study. Int J Neurosci 2005; 115:965-80. [PMID: 16051543 DOI: 10.1080/00207450590901396] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Cajal-Retzius cell is the prominent neuron of layer I of the cortex, playing a crucial role in cellular development and neuronal circuit formation, by secretion of reelin. In early cases of Alzheimer's disease the morphological and morphometric study of layer I of the temporal isocortex, based on silver impregnation techniques and electron microscopy, revealed a dramatic decline of the number of Cajal-Retzius cells. Because Cajal-Retzius cells and reelin are important factors for the synaptogenesis in the hippocampus and the brain isocortex, their loss may be implicated in the synaptic pathology and the multifactorious pathogenetic pathways of Alzheimer's disease.
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Affiliation(s)
- Stavros J Baloyannis
- Department of Neurology, School of Medicine, Aristotelian University, Thessaloniki, Greece.
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32
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Alcántara S, Pozas E, Ibañez CF, Soriano E. BDNF-modulated Spatial Organization of Cajal–Retzius and GABAergic Neurons in the Marginal Zone Plays a Role in the Development of Cortical Organization. Cereb Cortex 2005; 16:487-99. [PMID: 16000651 DOI: 10.1093/cercor/bhi128] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The present study utilizes nestin-BDNF transgenic mice, which offer a model for early increased brain-derived neurotrophic factor (BDNF) signalling, to examine the role of BDNF in the development of cortical architecture. Our results demonstrate that the premature and homogeneous expression of BDNF, while preserving tangential migration from the ganglionic eminence to the cortex, impairs the final radial migration of GABAergic neurons, as well as their integration in the appropriate cortical layers. Moreover, Cajal-Retzius (CR) cells and GABAergic neurons segregate in the cortical marginal zone (MZ) in response to BDNF signalling, leading to an alternating pattern and a columnar cortical organization, within which the migration of different neuronal populations is specifically affected. These results suggest that both CR and GABAergic neurons play a role in directing the radial migration of late-generated cortical neurons, and that the spatial distribution of these cells in the MZ is critical for the development of correct cortical organization. In addition, reelin secreted by CR cells in the MZ is not sufficient to direct the migration of late-born neurons to the upper cortical layers, which most likely requires the presence of reelin-secreting interneurons in layers V-VI. We propose that in addition to modulating reelin expression, BDNF regulates the patched distribution of CR and GABAergic neurons in the MZ, and that this spatial distribution is involved in the formation of anatomical and/or functional columns and convoluted structures.
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Affiliation(s)
- Soledad Alcántara
- Division of Molecular Neurobiology, Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.
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33
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Abstract
Cajal-Retzius (CR) cells are an enigmatic class of neurons located at the surface of the cerebral cortex, playing a major role in cortical development. In this review, we discuss several distinct features of these neurons and the mechanisms by which they regulate cortical development. Many CR cells likely have extracortical origin and undergo cell death during development. Recent genetic studies report unique patterns of gene expression in CR cells, which may help to explain the developmental processes in which they participate. Moreover, a number of studies indicate that CR cells, and their secreted gene product, reelin, are involved in neuronal migration by acting on two key partners, migrating neurons and radial glial cells. Emerging data show that these neurons are a critical part of an early and complex network of neural activity in layer I, supporting the notion that CR cells modulate cortical maturation. Given these key and complex developmental properties, it is therefore conceivable for CR cells to be implicated in the pathogenesis of a variety of neurological disorders.
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Affiliation(s)
- Eduardo Soriano
- Institut de Recerca Biomedica de Barcelona, Parc Cientific de Barcelona, University of Barcelona, Barcelona 08028, Spain.
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34
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Koutmani Y, Hurel C, Patsavoudi E, Hack M, Gotz M, Thomaidou D, Matsas R. BM88 is an early marker of proliferating precursor cells that will differentiate into the neuronal lineage. Eur J Neurosci 2005; 20:2509-23. [PMID: 15548196 DOI: 10.1111/j.1460-9568.2004.03724.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Progression of progenitor cells towards neuronal differentiation is tightly linked with cell cycle control and the switch from proliferative to neuron-generating divisions. We have previously shown that the neuronal protein BM88 drives neuroblastoma cells towards exit from the cell cycle and differentiation into a neuronal phenotype in vitro. Here, we explored the role of BM88 during neuronal birth, cell cycle exit and the initiation of differentiation in vivo. By double- and triple-labelling with the S-phase marker BrdU or the late G2 and M-phase marker cyclin B1, antibodies to BM88 and markers of the neuronal or glial cell lineages, we demonstrate that in the rodent forebrain, BM88 is expressed in multipotential progenitor cells before terminal mitosis and in their neuronal progeny during the neurogenic interval, as well as in the adult. Further, we defined at E16 a cohort of proliferative progenitors that exit S phase in synchrony, and by following their fate for 24 h we show that BM88 is associated with the dynamics of neuron-generating divisions. Expression of BM88 was also evident in cycling cortical radial glial cells, which constitute the main neurogenic population in the cerebral cortex. In agreement, BM88 expression was markedly reduced and restricted to a smaller percentage of cells in the cerebral cortex of the Small eye mutant mice, which lack functional Pax6 and exhibit severe neurogenesis defects. Our data show an interesting correlation between BM88 expression and the progression of progenitor cells towards neuronal differentiation during the neurogenic interval.
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Affiliation(s)
- Yassemi Koutmani
- Laboratory of Cellular and Molecular Neurobiology, Hellenic Pasteur Institute, 127 Vassilissis Sofias Avenue, Athens 115 21, Greece
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35
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Albrieux M, Platel JC, Dupuis A, Villaz M, Moody WJ. Early expression of sodium channel transcripts and sodium current by cajal-retzius cells in the preplate of the embryonic mouse neocortex. J Neurosci 2004; 24:1719-25. [PMID: 14973256 PMCID: PMC6730446 DOI: 10.1523/jneurosci.3548-02.2004] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In mouse, the first neurons are generated at embryonic day (E) 12 and form the preplate (PP), which contains a mix of future marginal zone cells, including Cajal-Retzius cells, and subplate cells. To detect developmental changes in channel populations in these earliest-generated neurons of the cerebral cortex, we studied the electrophysiological properties of proliferative cells of the ventricular zone and postmitotic neurons of the PP at E12 and E13, using whole-cell patch-clamp recordings. We found an inward sodium current in 55% of PP cells. To determine whether sodium currents occur in a specific cell type, we stained recorded cells with an antibody for calretinin, a calcium-binding protein found specifically in Cajal-Retzius cells. All calretinin-positive cells had sodium currents, although so did some calretinin-negative cells. To correlate the Na current expression to Na channel gene expression with the Cajal-Retzius cell phenotype, we performed single-cell reverse transcription-PCR on patch-clamp recorded cells to detect expression of the Cajal-Retzius cell marker reelin and the Na channel isoforms SCN 1, 2, and 3. These results showed that virtually all Cajal-Retzius cells (97%), as judged by reelin expression, express the SCN transcript identified as the SCN3 isoform. Of these, 41% presented a functional Na current. There is, however, a substantial SCN-positive population in the PP (27% of SCN-positive cells) that does not express reelin. These results raise the possibility that populations of pioneer neurons of the PP, including Cajal-Retzius cells, gain neuronal physiological properties early in development via expression of the Na(v)1.3 (SCN3) Na channel isoform.
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Affiliation(s)
- Mireille Albrieux
- Department of Biology, University of Washington, Seattle, Washington 98195, USA
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36
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García-Frigola C, Burgaya F, Calbet M, López-Domènech G, de Lecea L, Soriano E. A collection of cDNAs enriched in upper cortical layers of the embryonic mouse brain. ACTA ACUST UNITED AC 2004; 122:133-50. [PMID: 15010206 DOI: 10.1016/j.molbrainres.2003.12.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2003] [Indexed: 10/26/2022]
Abstract
In an attempt to elucidate the molecular basis of neuronal migration and corticogenesis, we performed subtractive hybridization of mRNAs from the upper cortical layers (layer I and upper cortical plate) against mRNAs from the remaining cerebral cortex at E15-E16. We obtained a collection of subtracted cDNA clones and analyzed their 3' UTR sequences, 47% of which correspond to EST sequences, and may represent novel products. Among the cloned sequences, we identified gene products that have not been reported in brain or in the cerebral cortex before. We examined the expression pattern of 39 subtracted clones, which was enriched in the upper layers of the cerebral cortex at embryonic stages. The expression of most clones is developmentally regulated, and especially high in embryonic and early postnatal stages. Four of the unknown clones were studied in more detail and identified as a new member of the tetraspanin superfamily, a putative RNA binding protein, a specific product of the adult dentate gyrus and a protein containing a beta-catenin repeat. We thus cloned a collection of subtracted cDNAs coding for protein products that may be involved in the development of the cerebral cortex.
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Affiliation(s)
- Cristina García-Frigola
- IRBB/PCB and Department of Cell Biology, Faculty of Biology, University of Barcelona, 08071 Barcelona, Spain
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37
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Hartfuss E, Förster E, Bock HH, Hack MA, Leprince P, Luque JM, Herz J, Frotscher M, Götz M. Reelin signaling directly affects radial glia morphology and biochemical maturation. Development 2003; 130:4597-609. [PMID: 12925587 DOI: 10.1242/dev.00654] [Citation(s) in RCA: 183] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Radial glial cells are characterized, besides their astroglial properties, by long radial processes extending from the ventricular zone to the pial surface, a crucial feature for the radial migration of neurons. The molecular signals that regulate this characteristic morphology, however, are largely unknown. We show an important role of the secreted molecule reelin for the establishment of radial glia processes. We describe a significant reduction in ventricular zone cells with long radial processes in the absence of reelin in the cortex of reeler mutant mice. These defects were correlated to a decrease in the content of brain lipid-binding protein (Blbp) and were detected exclusively in the cerebral cortex, but not in the basal ganglia of reeler mice. Conversely, reelin addition in vitro increased the Blbp content and process extension of radial glia from the cortex, but not the basal ganglia. Isolation of radial glia by fluorescent-activated cell sorting showed that these effects are due to direct signaling of reelin to radial glial cells. We could further demonstrate that this signaling requires Dab1, as the increase in Blbp upon reelin addition failed to occur in Dab1-/- mice. Taken together, these results unravel a novel role of reelin signaling to radial glial cells that is crucial for the regulation of their Blbp content and characteristic morphology in a region-specific manner.
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Affiliation(s)
- Eva Hartfuss
- Max-Planck-Institute of Neurobiology, Neuronal Specification, Am Klopferspitz 18a, D-82152 Martinsried, Germany
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38
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Abstract
Radial glia represent the major glial cell type in the developing CNS and perform many essential functions, which range from acting as neural precursors to providing physical substrates for newborn neurons to migrate on. Previous work has shown that cell-cell signaling is important for the development of the radial glial phenotype. In particular, signals from newborn neurons appear to contribute significantly to the formation of this cell type. In addition, radial glia may be involved in reciprocal signaling roles that contribute to regional patterning and differentiation in the developing CNS.
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Affiliation(s)
- Kenneth Campbell
- Division of Developmental Biology, Children's Hospital Research Foundation, Cincinnati, Ohio
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39
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Merlo A. Genes and pathways driving glioblastomas in humans and murine disease models. Neurosurg Rev 2003; 26:145-58. [PMID: 12783270 DOI: 10.1007/s10143-003-0267-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2002] [Accepted: 03/13/2003] [Indexed: 12/20/2022]
Abstract
Human malignant gliomas arise from neural progenitor cells and/or dedifferentiated astrocytes. By now, they are genetically so well characterized that several murine glioma models have emerged that faithfully reiterate the typical histological features of the disease. In experimental animals, only one or two elements of the growth factor/Ras, PI3K/PTEN/PKB, p53/ARF/HDM2, and p16/Rb/cyclinD/CDK4 pathways are targeted. In human gliomas, many additional genes and pathways are targeted due to a most severe mutator phenotype that leads to the accumulation of countless epigenetic and genetic alterations. Changes that convey a growth advantage are selected for, leading to overgrowth of precursor cell populations with increasingly malignant tumor cell clones. While murine models represent a powerful tool for elucidating the role of genetic pathways, mechanisms of response and resistance to new therapeutic agents might be fundamentally different due to the high degree of genomic instability in the human disease. In fact, little is known about the molecular causes of genomic instability involved in gliomas, except for the rare Turcot's syndrome, O(6)-methylguanine-DNA methyltransferase, and the apurinic/apyrimidinic endonuclease Ape-1. Novel approaches that selectively exploit fundamental metabolic differences between tumor and normal cells have to consider these fundamental differences between human disease and presently available, highly sophisticated animal models.
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Affiliation(s)
- Adrian Merlo
- Departments of Surgery and Research, University Hospitals, Spitalstrasse 21, 4031 Basel, Switzerland.
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40
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Abstract
Recently discovered multipotent astrocytic stem cells are discussed in light of current nomenclature for glial precursor and lineage-associated cells in the developing, postnatal, and adult mammalian brain. Defining the phenotype of any immature cell in the nervous system is a challenge, and a position is stated that includes the need for categorizing cells within a continuum of differentiation potential. The possibility for dedifferentiating glial cells into clonogenic stem-like cells offers numerous possibilities for translating knowledge and technology from this subfield of stem cell biology to regenerative medicine. Along with the need for developing a new lexicon for defining the cellular players that contribute to the generation of glia and neurons in the developing and mature central nervous system, the relationships also need to be established among potency, repopulation attempts, and tumorigenesis of cells meeting the criteria of glial stem cells. Finally, it is possible that understanding the normal differentiation, de- and transdifferentiation potential of glial stem-like cells in the mature central nervous system will provide insights into the possible use of these cells, or biogenic factors associated with their growth and differentiation, in therapeutic approaches for a variety of neurological disorders.
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Affiliation(s)
- Dennis A Steindler
- Department of Neuroscience, McKnight Brain Institute and Shands Cancer Center, and Program in Stem Cell Biology and Regenerative Medicine, University of Florida, Gainesville, Florida
| | - Eric D Laywell
- Department of Neuroscience, McKnight Brain Institute and Shands Cancer Center, and Program in Stem Cell Biology and Regenerative Medicine, University of Florida, Gainesville, Florida
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deAzevedo LC, Fallet C, Moura-Neto V, Daumas-Duport C, Hedin-Pereira C, Lent R. Cortical radial glial cells in human fetuses: depth-correlated transformation into astrocytes. JOURNAL OF NEUROBIOLOGY 2003; 55:288-98. [PMID: 12717699 DOI: 10.1002/neu.10205] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In the human brain, the transformation of radial glial cells (RGC) into astrocytes has been studied only rarely. In this work, we were interested in studying the morphologic aspects underlying this transformation during the fetal/perinatal period, particularly emphasizing the region-specific glial fiber anatomy in the medial cortex. We have used carbocyanine dyes (DiI/DiA) to identify the RGC transitional forms and glial fiber morphology. Immunocytochemical markers such as vimentin and glial fibrillary acidic protein (GFAP) were also employed to label the radial cells of glial lineage and to reveal the early pattern of astrocyte distribution. Neuronal markers such as neuronal-specific nuclear protein (NeuN) and microtubule-associated protein (MAP-2) were employed to discern whether or not these radial cells could, in fact, be neurons or neuronal precursors. The main findings concern the beginning of RGC transformation showing loss of the ventricular fixation in most cases, followed by transitional figures and the appearance of mature astrocytes. In addition, diverse fiber morphology related to depth within the cortical mantle was clearly demonstrated. We concluded that during the fetal/perinatal period the cerebral cortex is undergoing the final stages of radial neuronal migration, followed by involution of RGC ventricular processes and transformation into astrocytes. None of the transitional or other radial glia were positive for neuronal markers. Furthermore, the differential morphology of RGC fibers according to depth suggests that factors may act locally in the subplate and could have a role in the process of cortical RGC transformation and astrocyte localization. The early pattern of astrocyte distribution is bilaminar, sparing the cortical plate. Few astrocytes (GFAP+) in the upper band could be found with radial processes at anytime. This suggests that astrocytes in the marginal zone could be derived from different precursors than those that differentiate from RGCs during this period.
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Affiliation(s)
- Leonardo C deAzevedo
- Departamento de Anatomia, Instituto de Ciências Biomédicas, C.C.S. Bl. F, Universidade Federal do Rio de Janeiro, 21941-590, R.J., Brazil
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42
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Abstract
Neurogenesis continues into adulthood in two distinct regions, the subventricular zone of the forebrain and the subgranular zone of the dentate gyrus. Transplantation experiments have suggested that the two neurogenic regions have a special microenvironment to support the proliferation and differentiation of stem or progenitor cells. As the candidates of the microenvironment, three elements have so far been proposed: (i) astrocytes; (ii) polysialyl neural cell adhesion molecule (PSA-NCAM)-expressing immature neurons; and (iii) blood vessels. In the early developmental process of neurogenesis, newly born cells make clusters within the neurogenic regions and the clusters are found to interact structurally with astrocytes, polysialic acid-expressing immature cells, endothelium and extravascular basal laminae of blood vessels. Furthermore, recent reports have shown that astrocytes support the proliferation and differentiation of stem cells in vitro. These results suggest that these microenvironmental elements contribute to the cell proliferation and differentiation of stem or progenitor cells. However, it remains to be determined how the microenvironmental elements support adult neurogenesis functionally and coordinate with each other.
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Affiliation(s)
- Tatsunori Seki
- Department of Anatomy, Juntendo University School of Medicine, Tokyo, Japan.
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43
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Gierdalski M, Juliano SL. Influence of radial glia and Cajal-Retzius cells in neuronal migration. Results Probl Cell Differ 2003; 39:75-88. [PMID: 12353469 DOI: 10.1007/978-3-540-46006-0_4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Normal development of cerebral cortex depends on proper sequential genesis of cortical neurons and glia. Disruption of corticogenesis in ferret by short-term arresting of cell division using injections of methylazoxy methanol (MAM) leads to a specific constellation of effects, including disruption and early differentiation of radial glia into astrocytes and disorganization of reelin-containing Cajal-Retzius cells. We hypothesize that early interference of normal cortical development removes a factor instrumental in maintaining radial glia in their normal elongated shape. In support of this idea, coculture of MAM-treated slices with normal cortical plate restores radial glia and Cajal-Retzius cells to their normal positions. Recently, we found that conditioned medium obtained from normal organotypic cultures returned radial glia toward their normal morphology only in a fraction of 30-50 kDa molecular weight (MW). To assess whether restoring this factor would also improve effective migration into the cortical plate of E24 MAM-treated animals, we conducted experiments using cocultures of normal cortical plate with organotypic cultures of MAM-treated cortex, which received prior BrdU injections. In both the normal and E24 MAM-treated/normal cortical plate coculture, a greater percentage of BrdU positive cells migrated effectively into the cortical plate. We suggest that early interruption of cell division eliminates a population of cells and a factor important for maintaining proper cortical development, specifically providing cues maintaining elongation of radial glia.
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Affiliation(s)
- Marcin Gierdalski
- Department of Anatomy and Cell Biology, and Program in Neuroscience, USUHS, 4301 Jones Bridge Rd, Bethesda, Maryland 20814, USA
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44
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Hevner RF, Neogi T, Englund C, Daza RAM, Fink A. Cajal-Retzius cells in the mouse: transcription factors, neurotransmitters, and birthdays suggest a pallial origin. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 2003; 141:39-53. [PMID: 12644247 DOI: 10.1016/s0165-3806(02)00641-7] [Citation(s) in RCA: 163] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cajal-Retzius cells are reelin-secreting neurons found in the marginal zone of the mammalian cortex during development. Recently, it has been proposed that Cajal-Retzius cells may be generated both early and late in corticogenesis, and may migrate into the cortex from proliferative zones in the subpallium (lateral ganglionic eminence and medial ganglionic eminence) or cortical hem. In the present study, we used reelin as a marker to study the properties of Cajal-Retzius cells, including their likely origins, neurotransmitters, and birthdates. In double labeling experiments, Cajal-Retzius cells (reelin(+)) expressed transcription factors characteristic of pallial neurons (Tbr1 and Emx2), contained high levels of glutamate, were usually calretinin(+), and were born early in corticogenesis, on embryonic days (E)10.5 and E11.5. Tbr1(+) cells in the marginal zone were almost always reelin(+). The first Cajal-Retzius cells (Tbr1(+)/reelin(+)) appeared in the preplate on E10.5. In contrast, interneurons expressed a subpallial transcription factor (Dlx), contained high levels of GABA, were frequently calbindin(+), and were born throughout corticogenesis (from E10.5 to E16.5). Interneurons (Dlx(+)) first appeared in the cortex on E12.5. Our results suggest that the marginal zone contains two main types of neurons: Cajal-Retzius cells derived from the pallium, and migrating interneurons derived from the subpallium.
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Affiliation(s)
- Robert F Hevner
- Department of Pathology, University of Washington, Harborview Medical Center, Box 359630, 325 Ninth Ave, Seattle, WA 98104-2499, USA.
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Luque JM, Morante-Oria J, Fairén A. Localization of ApoER2, VLDLR and Dab1 in radial glia: groundwork for a new model of reelin action during cortical development. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 2003; 140:195-203. [PMID: 12586425 DOI: 10.1016/s0165-3806(02)00604-1] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reelin signaling pathway regulates laminar positioning of radially migrating neurons during cortical development. It has been suggested that reelin secreted by Cajal-Retzius cells in the marginal zone could provide either a stop or an attractant signal for migratory neurons expressing reelin receptors, but the proposed models fail to explain recent experimental findings. Here we provide evidence that the reelin receptor machinery, including the lipoprotein receptors ApoER2 and VLDLR along with the cytoplasmic adaptor protein Dab1, is located in radial glia precursors whose processes span the entire cortical wall from the ventricular zone to the pial surface. Moreover, in reeler mice, defective in reelin, decreased levels of Dab1 in the ventricular zone correspond to an accumulation of the protein in radial end-feet beneath the pia matter. Our results support that neural stem cells receive a functional reelin signal. They are also consistent with a working model of reelin action, according to which reelin signaling on the newborn neuron-inherited radial process regulates perikaryal translocation and positioning.
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Affiliation(s)
- Juan M Luque
- Instituto de Neurociencias, Universidad Miguel Hernández, CSIC, Campus de San Juan, E-03550, San Juan de Alicante, Spain.
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Hasling TA, Gierdalski M, Jablonska B, Juliano SL. A radialization factor in normal cortical plate restores disorganized radial glia and disrupted migration in a model of cortical dysplasia. Eur J Neurosci 2003; 17:467-80. [PMID: 12581165 DOI: 10.1046/j.1460-9568.2003.02468.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Treatment of pregnant ferrets on embryonic day 24 (E24) with the antimitotic methylazoxy methanol (MAM) leads to a specific constellation of effects in newborn kits, which include a very thin and poorly laminated neocortex, disruption of radial glial cell morphology with early differentiation into astrocytes, and abnormal positioning of Cajal-Retzius cells. We suggest that MAM treatment on E24 results in this model of cortical dysplasia by eliminating a population of cells that produce a factor capable of maintaining radial glia in their normal morphology. The abnormal radial glia, either alone or in combination with other abnormal features, are likely to prevent proper migration into the cortical plate. To test the possibility that normal cortex can provide the missing substance that influences radial glia, slices of E24 MAM-treated cortex were removed at postnatal day 0 (P0) and cultured adjacent to explants of P0 normal cortical plate. By labelling a small number of cells with injections of fluorescent dextrans into the cultured slices, we found that abnormal radial glia in MAM treated slices cocultured adjacent to normal cortical plate were restored toward normal, in comparison to E24 MAM treated slices cultured alone and in other control conditions. We also found that abnormally positioned Cajal-Retzius cells move into the marginal zone and that neurons are able to migrate into the cortical plate more effectively in the coculture condition. These data indicate that normal cortical plate of ferrets contains a factor causing radial glia to maintain their elongated morphology; the improved position of radial glia encourages repositioning of Cajal-Retzius cells and improved neuronal migration into the cortical plate.
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Affiliation(s)
- Thomas A Hasling
- Department of Anatomy, Physiology & Genetics, USUHS, 4301 Jones Bridge Road, Bethesda, MD 20814, USA
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Wang L, Andersson S, Warner M, Gustafsson JA. Estrogen receptor (ER)beta knockout mice reveal a role for ERbeta in migration of cortical neurons in the developing brain. Proc Natl Acad Sci U S A 2003; 100:703-8. [PMID: 12515851 PMCID: PMC141060 DOI: 10.1073/pnas.242735799] [Citation(s) in RCA: 185] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The present study stems from our previous observations that the brains of adult estrogen receptor beta knockout (ERbeta-/-) mice show regional neuronal hypocellularity especially in the cerebral cortex. We now show that ERbeta is necessary for late embryonic development of the brain and is involved in both neuronal migration and apoptosis. At embryonic day (E)18.5, ERbeta-/- mouse brains were smaller than those of the wild-type (WT) littermates, and there were fewer neurons in the cortex. There were no differences in size or cellularity at E14.5. When proliferating cells were labeled with 5'-bromodeoxyuridine (BrdUrd) on E12.5, a time when cortical neurogenesis in mice begins, and examined on E14.5, there was no difference between WT and ERbeta-/- mice in the number of labeled cells in the cortex. However, when BrdUrd was administered between E14.5 and E16.5, a time when postmitotic neurons migrate to layers of the cortex, there were fewer BrdUrd-labeled cells in the superficial cortical layers by E18.5 and postnatal day 14 in mice lacking ERbeta. At E18.5, there were more apoptotic cells in the ventricular zone of mice lacking ERbeta. In addition, the processes of the cortical radial glia, which are essential for guiding the migrating neurons, were fragmented. These findings suggest that by influencing migration and neuronal survival, ERbeta has an important role in brain development.
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Affiliation(s)
- Ling Wang
- Departments of Medical Nutrition and Biosciences, NOVUM, S-141 86 Huddinge, Sweden
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Hamasaki T, Goto S, Nishikawa S, Ushio Y. Neuronal cell migration for the developmental formation of the mammalian striatum. BRAIN RESEARCH. BRAIN RESEARCH REVIEWS 2003; 41:1-12. [PMID: 12505644 DOI: 10.1016/s0165-0173(02)00216-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The mammalian striatum is the largest receptive component of the basal ganglia circuit. It is involved in the control of various aspects of motor, cognitive, and emotional functions. In the telencephalon, the striatum has a unique histological property totally different from the cortical area and its ontogenesis remains largely unknown. In this review, we introduce recent advances in the understanding of neuronal cell migration, one of the most critical processes in the early phase of histogenesis that occurs in the embryonic striatum. It appears that there are three major modes of neuronal cell migration in the developmental formation of the striatum. They are (radial) outward, tangential, and inward migration, supplying the striatum with projection neurons, interneurons, and early-generated transient neurons that originate in the preplate, respectively. We challenge the classical concept that the striatum is solely derived from the restricted germinal area located in the basal telencephalon by providing evidence that striatal development requires the intermixture of different types of neurons originating from distinct regions of the telencephalon.
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Affiliation(s)
- Tadashi Hamasaki
- Laboratory of Neurobiology, Department of Neurosurgery, Kumamoto University Medical School, 1-1-1 Honjo, 860-8556, Kumamoto, Japan
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de Sampaio e Spohr TCL, Martinez R, da Silva EF, Neto VM, Gomes FCA. Neuro-glia interaction effects on GFAP gene: a novel role for transforming growth factor-beta1. Eur J Neurosci 2002; 16:2059-69. [PMID: 12473073 DOI: 10.1046/j.1460-9568.2002.02283.x] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Central nervous system (CNS) development is highly guided by microenvironment cues specially provided by neuron-glia interactions. By using a transgenic mouse bearing part of the gene promoter of the astrocytic maturation marker GFAP (glial fibrillary acidic protein) linked to the beta-galactosidase (beta-Gal) reporter gene, we previously demonstrated that cerebral cortical neurons increase transgenic beta-Gal astrocyte number and activate GFAP gene promoter by secretion of soluble factors in vitro. Here, we identified TGF-beta1 as the major mediator of this event. Identification of TGF-beta1 in neuronal and astrocyte extracts revealed that both cell types might synthesize this factor, however, addition of neurons to astrocyte monolayers greatly increased TGF-beta1 synthesis and secretion by astrocytes. Further, by exploiting the advantages of cell culture system we investigated the influence of neuron and astrocyte developmental stage on such interaction. We demonstrated that younger neurons derived from 14 embryonic days wild-type mice were more efficient in promoting astrocyte differentiation than those derived from 18 embryonic days mice. Similarly, astrocytes also exhibited timed-schedule developed responsiveness to neuronal influence with embryonic astrocytes being more responsive to neurons than newborn and late postnatal astrocytes. RT-PCR assays identified TGF-beta1 transcripts in young but not in old neurons, suggesting that inability to induce astrocyte differentiation is related to TGF-beta1 synthesis and secretion. Our work reveals an important role for neuron-glia interactions in astrocyte development and strongly implicates the involvement of TGF-beta1 in this event.
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Sarnat HB, Flores-Sarnat L. Role of Cajal-Retzius and subplate neurons in cerebral cortical development. Semin Pediatr Neurol 2002; 9:302-8. [PMID: 12523554 DOI: 10.1053/spen.2002.32506] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A synaptic network is already formed in the marginal zone of the early telencephalon before the arrival of the first wave of radial migration of neuroblasts from the subventricular zone to form the cortical plate. Cells and fibers forming the marginal zone are mainly the Cajal-Retzius (C-R) neurons and their processes. The origin of these cells is not yet proved but is likely either the median ganglionic eminence or the mesencephalic neuromere. The bipolar or multipolar C-R neurons populate the molecular layer of the fetal cortical plate and are sparse in the adult. Their thick axon emits collaterals for synaptic contact with pyramidal neurons initially in layer 6 and later with in all layers. C-R neurons produce GABA, possibly ACh, several calcium-binding proteins (eg, calmodulin, parvalbumin, calretinin) and several neuropeptides; they are rich in ribosomes. Subplate neurons, beneath the cortical plate, emit pioneer axons in the incipient formation of the internal capsule and also commissural fibers of the early hippocampus. C-R cells express products of the genes RELN, LIS1, and DS-CAM, which mediate radial neuroblast migration and lamination of the cortical plate and important in the pathogenesis of lissencephaly. A subpopulation of C-R neurons also expresses a p53 product implicated in cell survival and apoptosis. In addition to forming the first intrinsic synaptic circuits of the cortical plate and its first afferent and efferent connections with subcortical structures, they may play additional roles in the formation of ocular dominance columns, in regulating neuronogenesis, and in cortical repair. They do not disappear by apoptosis at the completion of cell migration, as was previously thought, but their functional role in the mature brain remains unknown.
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Affiliation(s)
- Harvey B Sarnat
- Department of Pediatrics (Neurology), Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
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