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Koketsu S, Matsubara K, Ueki Y, Shinohara Y, Inoue K, Murakami S, Ueki T. The defects of the hippocampal ripples and theta rhythm in depression, and the effects of physical exercise on their amelioration. Heliyon 2024; 10:e23738. [PMID: 38226277 PMCID: PMC10788462 DOI: 10.1016/j.heliyon.2023.e23738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 10/24/2023] [Accepted: 12/12/2023] [Indexed: 01/17/2024] Open
Abstract
Adverse environmental stress causes depressive symptoms with the impairments of memory formation, cognition, and motivation, however, their underlying neural bases have not been well understood, especially based on the observation of living animals. In the present study, therefore, the mice model of restraint-induced stress was examined electrophysiologically to investigate the alterations of hippocampal sharp wave ripples (SWRs) and theta rhythms. In addition, the therapeutic effects of physical exercise on the amelioration of those hippocampal impairments were examined in combination with a series of behavioral tests. The data demonstrated that chronic restraint stress caused the reductions of occurrence and amplitude of hippocampal SWRs and the decreases of occurrence, duration, and power of theta rhythms, while physical exercise significantly reverted them to the levels of healthy control. Furthermore, hippocampal adult neurogenesis and microglial activation, previously reported to be involved in the etiology of depression, were histologically examined in the mice. The results showed that the impairment of neurogenesis and alleviation of microglial activation were induced in the depressed mice. On the other hand, physical exercise considerably ameliorated those pathological conditions in the affected brain. Consistently, the data of behavioral tests in mice suggested that physical exercise ameliorated the symptomatic defects of motivation, memory formation, and cognition in the depressed mice. The impairments of hippocampal SWRs and theta rhythms in the affected hippocampus are linked with the symptomatic impairments of cognition and motivation, and the defect of memory formation, respectively, in depression. Taken together, this study demonstrated the implications of impairment of the hippocampal SWRs and theta rhythms in the etiology of depression and their usefulness as diagnostic markers of depression.
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Affiliation(s)
- Shinnosuke Koketsu
- Department of Rehabilitation Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
- Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
- Department of Physical Therapy, Nagoya Women's University Faculty of Medical Science, Nagoya, Aichi, 467-8610, Japan
| | - Kohki Matsubara
- Department of Rehabilitation Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
| | - Yoshino Ueki
- Department of Rehabilitation Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
| | - Yoshiaki Shinohara
- Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
- Department of Anatomy and Cell Biology, Yamanashi University Graduate School of Medical Sciences, Chuo, Yamanashi, 409-3898, Japan
| | - Koichi Inoue
- Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
- Department of Anatomy and Cell Biology, Nara Medical University, Kashihara, Nara, 634-8521, Japan
| | - Satona Murakami
- Department of Rehabilitation Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
| | - Takatoshi Ueki
- Department of Integrative Anatomy, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, 467-8601, Japan
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2
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Menon R, Süß T, Oliveira VEDM, Neumann ID, Bludau A. Neurobiology of the lateral septum: regulation of social behavior. Trends Neurosci 2021; 45:27-40. [PMID: 34810019 DOI: 10.1016/j.tins.2021.10.010] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 10/12/2021] [Accepted: 10/22/2021] [Indexed: 12/21/2022]
Abstract
Social interactions are essential for mammalian life and are regulated by evolutionary conserved neuronal mechanisms. An individual's internal state, experiences, and the nature of the social stimulus are critical for determining apt responses to social situations. The lateral septum (LS) - a structure of the basal forebrain - integrates abundant cortical and subcortical inputs, and projects to multiple downstream regions to generate appropriate behavioral responses. Although incoming cognitive information is indispensable for contextualizing a social stimulus, neuromodulatory information related to the internal state of the organism significantly influences the behavioral outcome as well. This review article provides an overview of the neuroanatomical properties of the LS, and examines its neurochemical (neuropeptidergic and hormonal) signaling, which provide the neuromodulatory information essential for fine-tuning social behavior across the lifespan.
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Affiliation(s)
- Rohit Menon
- Department of Behavioral and Molecular Neurobiology, University of Regensburg, Regensburg, Germany
| | - Theresa Süß
- Department of Behavioral and Molecular Neurobiology, University of Regensburg, Regensburg, Germany
| | - Vinícius Elias de Moura Oliveira
- Department of Behavioral and Molecular Neurobiology, University of Regensburg, Regensburg, Germany; Laboratory of Neuroendocrinology, GIGA Neurosciences, University of Liege, Liege, Belgium
| | - Inga D Neumann
- Department of Behavioral and Molecular Neurobiology, University of Regensburg, Regensburg, Germany
| | - Anna Bludau
- Department of Behavioral and Molecular Neurobiology, University of Regensburg, Regensburg, Germany.
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3
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Wander CM, Song J. The neurogenic niche in Alzheimer's disease. Neurosci Lett 2021; 762:136109. [PMID: 34271133 PMCID: PMC9013442 DOI: 10.1016/j.neulet.2021.136109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 06/17/2021] [Accepted: 07/07/2021] [Indexed: 12/15/2022]
Abstract
Adult hippocampal neurogenesis is the process of generation and functional incorporation of new neurons, formed by adult neural stem cells in the dentate gyrus. Adult hippocampal neurogenesis is highly dependent upon the integration of dynamic external stimuli and is instrumental in the formation of new spatial memories. Adult hippocampal neurogenesis is therefore uniquely sensitive to the summation of neuronal circuit and neuroimmune environments that comprise the neurogenic niche, and has powerful implications in diseases of aging and neurological disorders. This sensitivity underlies the neurogenic niche alterations commonly observed in Alzheimer's disease, the most common form of dementia. This review summarizes Alzheimer's disease associated changes in neuronal network activity, neuroinflammatory processes, and adult neural stem cell fate choice that ultimately result in neurogenic niche dysfunction and impaired adult hippocampal neurogenesis. A more comprehensive understanding of the complex changes mediating neurogenic niche disturbances in Alzheimer's disease will aid development of future therapies targeting adult neurogenesis.
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Affiliation(s)
- Connor M Wander
- Department of Pharmacology, University of North Carolina at Chapel Hill
| | - Juan Song
- Department of Pharmacology, University of North Carolina at Chapel Hill
- Neuroscience Center, University of North Carolina, Chapel Hill, NC 27599, USA
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4
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Madrid LI, Jimenez-Martin J, Coulson EJ, Jhaveri DJ. Cholinergic regulation of adult hippocampal neurogenesis and hippocampus-dependent functions. Int J Biochem Cell Biol 2021; 134:105969. [PMID: 33727042 DOI: 10.1016/j.biocel.2021.105969] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 03/10/2021] [Indexed: 10/21/2022]
Abstract
The production and circuit integration of new neurons is one of the defining features of the adult mammalian hippocampus. A wealth of evidence has established that adult hippocampal neurogenesis is exquisitely sensitive to neuronal activity-mediated regulation. How these signals are interpreted and contribute to neurogenesis and hippocampal functions has been a subject of immense interest. In particular, neurotransmitters, in addition to their synaptic roles, have been shown to offer important trophic support. Amongst these, acetylcholine, which has a prominent role in cognition, has been implicated in regulating neurogenesis. In this review, we appraise the evidence linking the contribution of cholinergic signalling to the regulation of adult hippocampal neurogenesis and hippocampus-dependent functions. We discuss open questions that need to be addressed to gain a deeper mechanistic understanding of the role and translational potential of acetylcholine and its receptors in regulating this form of cellular neuroplasticity.
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Affiliation(s)
- Lidia I Madrid
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Javier Jimenez-Martin
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Elizabeth J Coulson
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia; School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Dhanisha J Jhaveri
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia; Mater Research Institute - The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia.
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5
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Multiple Roles for Cholinergic Signaling from the Perspective of Stem Cell Function. Int J Mol Sci 2021; 22:ijms22020666. [PMID: 33440882 PMCID: PMC7827396 DOI: 10.3390/ijms22020666] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 01/11/2023] Open
Abstract
Stem cells have extensive proliferative potential and the ability to differentiate into one or more mature cell types. The mechanisms by which stem cells accomplish self-renewal provide fundamental insight into the origin and design of multicellular organisms. These pathways allow the repair of damage and extend organismal life beyond that of component cells, and they probably preceded the evolution of complex metazoans. Understanding the true nature of stem cells can only come from discovering how they are regulated. The concept that stem cells are controlled by particular microenvironments, also known as niches, has been widely accepted. Technical advances now allow characterization of the zones that maintain and control stem cell activity in several organs, including the brain, skin, and gut. Cholinergic neurons release acetylcholine (ACh) that mediates chemical transmission via ACh receptors such as nicotinic and muscarinic receptors. Although the cholinergic system is composed of organized nerve cells, the system is also involved in mammalian non-neuronal cells, including stem cells, embryonic stem cells, epithelial cells, and endothelial cells. Thus, cholinergic signaling plays a pivotal role in controlling their behaviors. Studies regarding this signal are beginning to unify our understanding of stem cell regulation at the cellular and molecular levels, and they are expected to advance efforts to control stem cells therapeutically. The present article reviews recent findings about cholinergic signaling that is essential to control stem cell function in a cholinergic niche.
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Soligo M, Protto V, Chiaretti A, Piccinin S, De Stefano ME, Nisticò R, Bracci-Laudiero L, Manni L. Effects of intranasally-delivered pro-nerve growth factors on the septo-hippocampal system in healthy and diabetic rats. Neuropharmacology 2020; 176:108223. [PMID: 32681844 DOI: 10.1016/j.neuropharm.2020.108223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/22/2020] [Accepted: 06/25/2020] [Indexed: 11/25/2022]
Abstract
Pro-nerve growth factor (proNGF) is the predominant form of NGF in the brain and its levels increase in neurodegenerative diseases. The balance between NGF receptors may explain the contradictory biological activities of proNGF. However, the specific role of the two main proNGF variants is mostly unexplored. proNGF-A is prevalently expressed in healthy brain, while proNGF-B content increases in the neuro-degenerating brain. Recently we have investigated in vitro the biological action of native mouse proNGF variants. To gain further insights into the specific functions of the two proNGFs, here we intranasally delivered mouse-derived proNGF-A and proNGF-B to the brain parenchyma of healthy and diabetic rats, the latter characterized by dysfunction in spatial learning and memory, in the septo-hippocampal circuitry and by relative increase in proNGF-B hippocampal levels. Exogenous proNGF-B induces depression of hippocampal DG-LTP and impairment of hippocampal neurogenesis in healthy animals, with concomitant decrease in basal forebrain cholinergic neurons and cholinergic fibers projecting to the hippocampus. proNGF-A, while ineffective in healthy animals, rescues the diabetes-induced impairment in DG-LTP and hippocampal neurogenesis, promoting the concomitant recovery of the basal forebrain cholinergic phenotype. Our experimental evidences suggest that the balance between different proNGFs may influence the development and progression of neurodegenerative diseases.
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Affiliation(s)
- Marzia Soligo
- Institute of Translational Pharmacology, Consiglio Nazionale Delle Ricerche (CNR), Rome, Italy
| | - Virginia Protto
- Institute of Translational Pharmacology, Consiglio Nazionale Delle Ricerche (CNR), Rome, Italy
| | - Antonio Chiaretti
- Institute of Pediatrics, Università Cattolica del Sacro Cuore, Rome, Italy
| | | | - Maria Egle De Stefano
- Department of Biology and Biotechnology "Charles Darwin", Sapienza University, Rome, Italy
| | - Robert Nisticò
- European Brain Research Institute (EBRI), Rome, Italy; Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Luisa Bracci-Laudiero
- Institute of Translational Pharmacology, Consiglio Nazionale Delle Ricerche (CNR), Rome, Italy; Division of Rheumatology and Immuno-Rheumatology Research Laboratories, Bambino Gesù Children's Hospital, Rome, Italy
| | - Luigi Manni
- Institute of Translational Pharmacology, Consiglio Nazionale Delle Ricerche (CNR), Rome, Italy.
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7
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An Overview of Nicotinic Cholinergic System Signaling in Neurogenesis. Arch Med Res 2020; 51:287-296. [DOI: 10.1016/j.arcmed.2020.03.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 03/13/2020] [Accepted: 03/30/2020] [Indexed: 12/19/2022]
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8
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Ramos Costa AP, Levone BR, Gururajan A, Moloney G, Hoeller AA, Lino-de-Oliveira C, Dinan TG, O'Leary OF, Monteiro de Lima TC, Cryan JF. Enduring effects of muscarinic receptor activation on adult hippocampal neurogenesis, microRNA expression and behaviour. Behav Brain Res 2019; 362:188-198. [PMID: 30650342 DOI: 10.1016/j.bbr.2018.12.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 12/17/2018] [Accepted: 12/22/2018] [Indexed: 12/27/2022]
Abstract
The cholinergic system is one of the most important neurotransmitter systems in the brain with key roles in autonomic control and the regulation of cognitive and emotional responses. However, the precise mechanism by which the cholinergic system influences behaviour is unclear. Adult hippocampal neurogenesis (AHN) is a potential mediator in this context based on evidence, which has identified this process as putative mechanism of antidepressant action. More recently, post-transcriptional regulation by microRNAs is another candidate mechanism based on its involvement in the regulation of AHN and neurotransmission. Taking into account this background, we evaluated the behavioural effects of a non-convulsant dose of pilocarpine - a non-selective muscarinic receptor (mAChR) agonist - in adult Wistar rats. Furthermore, we quantified the expression of different microRNAs implicated in the regulation of AHN. Our results suggests that pilocarpine treatment increases AHN in the granular cell layer but also induced ectopic neurogenesis. Pilocarpine treatment reduced immobility time in forced swimming test but did not affect fear conditioning response, sucrose preference or novelty supressed feeding behaviour. In addition, treatment with pilocarpine down-regulated the expression of 6 microRNAs implicated in the regulation of neurotrophin signalling and axon guidance pathways. Therefore, we suggest that the low-dose stimulation of the cholinergic system is sufficient to alter AHN of rats through post-transcriptional mechanisms, which might contribute to long-lasting behavioural effects.
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Affiliation(s)
- Ana Paula Ramos Costa
- APC Microbiome Ireland, University College Cork, Ireland; Graduate Program in Medical Sciences, Federal University of Santa Catarina, Brazil
| | | | - Anand Gururajan
- APC Microbiome Ireland, University College Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Ireland
| | - Gerard Moloney
- Department of Anatomy and Neuroscience, University College Cork, Ireland
| | - Alexandre A Hoeller
- Graduate Program in Medical Sciences, Federal University of Santa Catarina, Brazil
| | | | | | - Olivia F O'Leary
- APC Microbiome Ireland, University College Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Ireland
| | | | - John F Cryan
- APC Microbiome Ireland, University College Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Ireland.
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9
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Protto V, Soligo M, De Stefano ME, Farioli‐Vecchioli S, Marlier LNJL, Nisticò R, Manni L. Electroacupuncture in rats normalizes the diabetes‐induced alterations in the septo‐hippocampal cholinergic system. Hippocampus 2019; 29:891-904. [DOI: 10.1002/hipo.23088] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 12/27/2018] [Accepted: 02/26/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Virginia Protto
- Institute of Translational PharmacologyConsiglio Nazionale delle Ricerche (CNR) Rome Italy
| | - Marzia Soligo
- Institute of Translational PharmacologyConsiglio Nazionale delle Ricerche (CNR) Rome Italy
| | - Maria Egle De Stefano
- Department of Biology and Biotechnology “Charles Darwin”Sapienza University Rome Italy
| | | | | | - Robert Nisticò
- Pharmacology of Synaptic Disease Lab, European Brain Research Institute (EBRI) Rome Italy
- Department of BiologyUniversity of Rome Tor Vergata Rome Italy
| | - Luigi Manni
- Institute of Translational PharmacologyConsiglio Nazionale delle Ricerche (CNR) Rome Italy
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10
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Káradóttir RT, Kuo CT. Neuronal Activity-Dependent Control of Postnatal Neurogenesis and Gliogenesis. Annu Rev Neurosci 2018; 41:139-161. [PMID: 29618286 DOI: 10.1146/annurev-neuro-072116-031054] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The addition of new neurons and oligodendroglia in the postnatal and adult mammalian brain presents distinct forms of gray and white matter plasticity. Substantial effort has been devoted to understanding the cellular and molecular mechanisms controlling postnatal neurogenesis and gliogenesis, revealing important parallels to principles governing the embryonic stages. While during central nervous system development, scripted temporal and spatial patterns of neural and glial progenitor proliferation and differentiation are necessary to create the nervous system architecture, it remains unclear what driving forces maintain and sustain postnatal neural stem cell (NSC) and oligodendrocyte progenitor cell (OPC) production of new neurons and glia. In recent years, neuronal activity has been identified as an important modulator of these processes. Using the distinct properties of neurotransmitter ionotropic and metabotropic channels to signal downstream cellular events, NSCs and OPCs share common features in their readout of neuronal activity patterns. Here we review the current evidence for neuronal activity-dependent control of NSC/OPC proliferation and differentiation in the postnatal brain, highlight some potential mechanisms used by the two progenitor populations, and discuss future studies that might advance these research areas further.
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Affiliation(s)
- Ragnhildur T Káradóttir
- Wellcome Trust - Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, United Kingdom; .,Department of Veterinary Medicine, University of Cambridge, Cambridge CB3 0ES, United Kingdom
| | - Chay T Kuo
- Departments of Cell Biology and Neurobiology, Duke University School of Medicine, Durham, North Carolina 27710, USA; .,Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina 27710, USA.,Institute for Brain Sciences, Duke University, Durham, North Carolina 27708, USA
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11
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Song J, Olsen RHJ, Sun J, Ming GL, Song H. Neuronal Circuitry Mechanisms Regulating Adult Mammalian Neurogenesis. Cold Spring Harb Perspect Biol 2016; 8:cshperspect.a018937. [PMID: 27143698 DOI: 10.1101/cshperspect.a018937] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The adult mammalian brain is a dynamic structure, capable of remodeling in response to various physiological and pathological stimuli. One dramatic example of brain plasticity is the birth and subsequent integration of newborn neurons into the existing circuitry. This process, termed adult neurogenesis, recapitulates neural developmental events in two specialized adult brain regions: the lateral ventricles of the forebrain. Recent studies have begun to delineate how the existing neuronal circuits influence the dynamic process of adult neurogenesis, from activation of quiescent neural stem cells (NSCs) to the integration and survival of newborn neurons. Here, we review recent progress toward understanding the circuit-based regulation of adult neurogenesis in the hippocampus and olfactory bulb.
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Affiliation(s)
- Juan Song
- Department of Pharmacology and Pharmacology Training Program, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599 Neuroscience Center and Neurobiology Curriculum, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Reid H J Olsen
- Department of Pharmacology and Pharmacology Training Program, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Jiaqi Sun
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Guo-Li Ming
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 Adrienne Helis Malvin Medical Research Foundation, New Orleans, Louisiana 70130-2685
| | - Hongjun Song
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 Adrienne Helis Malvin Medical Research Foundation, New Orleans, Louisiana 70130-2685
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12
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Malt EA, Juhasz K, Malt UF, Naumann T. A Role for the Transcription Factor Nk2 Homeobox 1 in Schizophrenia: Convergent Evidence from Animal and Human Studies. Front Behav Neurosci 2016; 10:59. [PMID: 27064909 PMCID: PMC4811959 DOI: 10.3389/fnbeh.2016.00059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 03/11/2016] [Indexed: 12/22/2022] Open
Abstract
Schizophrenia is a highly heritable disorder with diverse mental and somatic symptoms. The molecular mechanisms leading from genes to disease pathology in schizophrenia remain largely unknown. Genome-wide association studies (GWASs) have shown that common single-nucleotide polymorphisms associated with specific diseases are enriched in the recognition sequences of transcription factors that regulate physiological processes relevant to the disease. We have used a “bottom-up” approach and tracked a developmental trajectory from embryology to physiological processes and behavior and recognized that the transcription factor NK2 homeobox 1 (NKX2-1) possesses properties of particular interest for schizophrenia. NKX2-1 is selectively expressed from prenatal development to adulthood in the brain, thyroid gland, parathyroid gland, lungs, skin, and enteric ganglia, and has key functions at the interface of the brain, the endocrine-, and the immune system. In the developing brain, NKX2-1-expressing progenitor cells differentiate into distinct subclasses of forebrain GABAergic and cholinergic neurons, astrocytes, and oligodendrocytes. The transcription factor is highly expressed in mature limbic circuits related to context-dependent goal-directed patterns of behavior, social interaction and reproduction, fear responses, responses to light, and other homeostatic processes. It is essential for development and mature function of the thyroid gland and the respiratory system, and is involved in calcium metabolism and immune responses. NKX2-1 interacts with a number of genes identified as susceptibility genes for schizophrenia. We suggest that NKX2-1 may lie at the core of several dose dependent pathways that are dysregulated in schizophrenia. We correlate the symptoms seen in schizophrenia with the temporal and spatial activities of NKX2-1 in order to highlight promising future research areas.
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Affiliation(s)
- Eva A Malt
- Department of Adult Habilitation, Akershus University HospitalLørenskog, Norway; Institute of Clinical Medicine, Ahus Campus University of OsloOslo, Norway
| | - Katalin Juhasz
- Department of Adult Habilitation, Akershus University Hospital Lørenskog, Norway
| | - Ulrik F Malt
- Institute of Clinical Medicine, University of OsloOslo, Norway; Department of Research and Education, Institution of Oslo University HospitalOslo, Norway
| | - Thomas Naumann
- Centre of Anatomy, Institute of Cell Biology and Neurobiology, Charite Universitätsmedizin Berlin Berlin, Germany
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13
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Blusztajn JK, Rinnofner J. Intrinsic Cholinergic Neurons in the Hippocampus: Fact or Artifact? Front Synaptic Neurosci 2016; 8:6. [PMID: 27014052 PMCID: PMC4785141 DOI: 10.3389/fnsyn.2016.00006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 02/26/2016] [Indexed: 11/13/2022] Open
Abstract
It is generally agreed that hippocampal acetylcholine (ACh) is synthesized and released exclusively from the terminals of the long-axon afferents whose cell bodies reside in the medial septum and diagonal band. The search for intrinsic cholinergic neurons in the hippocampus has a long history; however evidence for the existence of these neurons has been inconsistent, with most investigators failing to detect them using in situ hybridization or immunohistochemical staining of the cholinergic markers, choline acetyltransferase (ChAT) or vesicular acetylcholine transporter (VAChT). Advances in the use of bacterial artificial chromosome (BAC) transgenic mice expressing a reporter protein under the control of the genomic elements of the Chat gene (Chat-BAC mice) have facilitated studies of cholinergic neurons. Such mice show robust and faithful expression of the reporter proteins in all known cholinergic cell populations. The availability of the Chat-BAC mice re-ignited interest in hippocampal cholinergic interneurons, because a small number of such reporter-expressing cells is frequently observed in the hippocampus of these mice. However, to date, attempts to confirm that these neurons co-express the endogenous cholinergic marker ChAT, or release ACh, have been unsuccessful. Without such confirmatory evidence it is best to conclude that there are no cholinergic neurons in the hippocampus. Similar considerations apply to other BAC transgenic lines, whose utility as a discovery tool for cell populations heretofore not known to express the genes of interest encoded by the BACs, must be validated by methods that detect expression of the endogenous genes.
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Affiliation(s)
- Jan Krzysztof Blusztajn
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine Boston, MA, USA
| | - Jasmine Rinnofner
- Department of Applied Life Sciences, University of Applied Sciences Vienna, Austria
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14
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Abstract
New neuron addition via continued neurogenesis in the postnatal/adult mammalian brain presents a distinct form of nervous system plasticity. During embryonic development, precise temporal and spatial patterns of neurogenesis are necessary to create the nervous system architecture. Similar between embryonic and postnatal stages, neurogenic proliferation is regulated by neural stem cell (NSC)-intrinsic mechanisms layered upon cues from their local microenvironmental niche. Following developmental assembly, it remains relatively unclear what may be the key driving forces that sustain continued production of neurons in the postnatal/adult brain. Recent experimental evidence suggests that patterned activity from specific neural circuits can also directly govern postnatal/adult neurogenesis. Here, we review experimental findings that revealed cholinergic modulation, and how patterns of neuronal activity and acetylcholine release may differentially or synergistically activate downstream signaling in NSCs. Higher-order excitatory and inhibitory inputs regulating cholinergic neuron firing, and their implications in neurogenesis control are also considered.
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Affiliation(s)
- Brent Asrican
- Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | | | - Joshua Erb
- Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA; Neurobiology Graduate Training Program, Duke University School of Medicine, Durham, NC 27710, USA
| | - Chay T Kuo
- Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA; Neurobiology Graduate Training Program, Duke University School of Medicine, Durham, NC 27710, USA; Brumley Neonatal Perinatal Research Institute, Duke University School of Medicine, Durham, NC 27710, USA; Department of Neurobiology, Duke University School of Medicine, Durham, NC 27710, USA; Preston Robert Tisch Brain Tumor Center, Duke University School of Medicine, Durham, NC 27710, USA; Duke Institute for Brain Sciences, Duke University School of Medicine, Durham, NC 27710, USA
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15
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Whitfield JF, Chiarini A, Dal Prà I, Armato U, Chakravarthy B. The Possible Roles of the Dentate Granule Cell's Leptin and Other Ciliary Receptors in Alzheimer's Neuropathology. Cells 2015; 4:253-74. [PMID: 26184316 PMCID: PMC4588035 DOI: 10.3390/cells4030253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 06/18/2015] [Accepted: 07/06/2015] [Indexed: 12/20/2022] Open
Abstract
Dentate-gyral granule cells in the hippocampus plus dentate gyrus memory-recording/retrieving machine, unlike most other neurons in the brain, are continuously being generated in the adult brain with the important task of separating overlapping patterns of data streaming in from the outside world via the entorhinal cortex. This "adult neurogenesis" is driven by tools in the mature granule cell's cilium. Here we report our discovery of leptin's LepRb receptor in this cilium. In addition, we discuss how ciliary LepRb signaling might be involved with ciliary p75NTR and SSTR3 receptors in adult neurogenesis and memory formation as well as attenuation of Alzheimer's neuropathology by reducing the production of its toxic amyloid-β-derived drivers.
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Affiliation(s)
- James F Whitfield
- Human Health Therapeutics, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada.
| | - Anna Chiarini
- Histology & Embryology Unit, Department of Life & Reproduction Sciences, University of Verona Medical School, 8 Strada Le Grazie, Verona, Venetia 37134, Italy.
| | - Ilaria Dal Prà
- Histology & Embryology Unit, Department of Life & Reproduction Sciences, University of Verona Medical School, 8 Strada Le Grazie, Verona, Venetia 37134, Italy.
| | - Ubaldo Armato
- Histology & Embryology Unit, Department of Life & Reproduction Sciences, University of Verona Medical School, 8 Strada Le Grazie, Verona, Venetia 37134, Italy.
| | - Balu Chakravarthy
- Human Health Therapeutics, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada.
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Gao Q, Jeon SJ, Jung HA, Lee HE, Park SJ, Lee Y, Lee Y, Ko SY, Kim B, Choi JS, Ryu JH. Nodakenin Enhances Cognitive Function and Adult Hippocampal Neurogenesis in Mice. Neurochem Res 2015; 40:1438-47. [PMID: 25998887 DOI: 10.1007/s11064-015-1612-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 04/30/2015] [Accepted: 05/11/2015] [Indexed: 01/09/2023]
Abstract
In our previous study, we demonstrated that nodakenin, a coumarin compound isolated from Angelica decursiva, ameliorates learning and memory impairments induced by scopolamine. In the present study, we investigated the effects of nodakenin on the cognitive function in the normal naïve mice in a passive avoidance task, and the results showed that nodakenin significantly increased the latency time in normal naïve mice. In addition, sub-chronic administration of nodakenin increased the number of 5-bromo-2-deoxyuridine (BrdU)-positive cells in the hippocampal dentate gyrus (DG) region. The percentage of BrdU and NeuN (neuronal cell marker)-immunopositive cells was also significantly increased by the nodakenin administration. Western blotting results showed that the expression levels of phosphorylated protein kinase B (Akt) and phosphorylated glycogen synthase kinase-3β (GSK-3β) were significantly increased in hippocampal tissue by sub-chronic nodakenin administration. These findings suggest that the sub-chronic administration of nodakenin enhances adult hippocampal neurogenesis in the DG region via Akt-GSK-3β signaling and this increase may be associated with nodakenin's positive effect on cognitive processing.
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Affiliation(s)
- Qingtao Gao
- Department of Life and Nanopharmaceutical Sciences, College of Pharmacy, Kyung Hee University, Seoul, Republic of Korea
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17
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De La Rosa-Prieto C, De Moya-Pinilla M, Saiz-Sanchez D, Ubeda-Banon I, Arzate DM, Flores-Cuadrado A, Liberia T, Crespo C, Martinez-Marcos A. Olfactory and cortical projections to bulbar and hippocampal adult-born neurons. Front Neuroanat 2015; 9:4. [PMID: 25698936 PMCID: PMC4313705 DOI: 10.3389/fnana.2015.00004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 01/09/2015] [Indexed: 11/16/2022] Open
Abstract
New neurons are continually generated in the subependymal layer of the lateral ventricles and the subgranular zone of dentate gyrus during adulthood. In the subventricular zone, neuroblasts migrate a long distance to the olfactory bulb where they differentiate into granule or periglomerular interneurons. In the hippocampus, neuroblasts migrate a short distance from the subgranular zone to the granule cell layer of the dentate gyrus to become granule neurons. In addition to the short-distance inputs, bulbar interneurons receive long-distance centrifugal afferents from olfactory-recipient structures. Similarly, dentate granule cells receive differential inputs from the medial and lateral entorhinal cortices through the perforant pathway. Little is known concerning these new inputs on the adult-born cells. In this work, we have characterized afferent inputs to 21-day old newly-born neurons. Mice were intraperitoneally injected with bromodeoxyuridine. Two weeks later, rhodamine-labeled dextran-amine was injected into the anterior olfactory nucleus, olfactory tubercle, piriform cortex and lateral and medial entorhinal cortices. One week later, animals were perfused and immunofluorescences were carried out. The data show that projection neurons from the mentioned structures, establish putative synaptic contacts onto 21-day-old neurons in the olfactory bulb and dentate gyrus, in some cases even before they start to express specific subpopulation proteins. Long-distance afferents reach middle and outer one-third portions of the molecular layer of the dentate gyrus and granule and, interestingly, periglomerular layers of the olfactory bulb. In the olfactory bulb, these fibers appear to establish presumptive axo-somatic contacts onto newly-born granule and periglomerular cells.
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Affiliation(s)
- Carlos De La Rosa-Prieto
- Neuroplasticity and Neurodegeneration Laboratory, Department of Medical Sciences, Ciudad Real Medical School, El Centro Regional de Investigaciones Biomédicas, Universidad de Castilla-La Mancha Ciudad Real, Spain
| | - Miguel De Moya-Pinilla
- Neuroplasticity and Neurodegeneration Laboratory, Department of Medical Sciences, Ciudad Real Medical School, El Centro Regional de Investigaciones Biomédicas, Universidad de Castilla-La Mancha Ciudad Real, Spain
| | - Daniel Saiz-Sanchez
- Neuroplasticity and Neurodegeneration Laboratory, Department of Medical Sciences, Ciudad Real Medical School, El Centro Regional de Investigaciones Biomédicas, Universidad de Castilla-La Mancha Ciudad Real, Spain
| | - Isabel Ubeda-Banon
- Neuroplasticity and Neurodegeneration Laboratory, Department of Medical Sciences, Ciudad Real Medical School, El Centro Regional de Investigaciones Biomédicas, Universidad de Castilla-La Mancha Ciudad Real, Spain
| | - Dulce M Arzate
- Department of Cellular and Molecular Neurobiology, Neurobiology Institute, Universidad Nacional Autónoma de México Querétaro, México
| | - Alicia Flores-Cuadrado
- Neuroplasticity and Neurodegeneration Laboratory, Department of Medical Sciences, Ciudad Real Medical School, El Centro Regional de Investigaciones Biomédicas, Universidad de Castilla-La Mancha Ciudad Real, Spain
| | - Teresa Liberia
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Valencia Burjassot, Spain
| | - Carlos Crespo
- Departamento de Biología Celular, Facultad de Ciencias Biológicas, Universidad de Valencia Burjassot, Spain
| | - Alino Martinez-Marcos
- Neuroplasticity and Neurodegeneration Laboratory, Department of Medical Sciences, Ciudad Real Medical School, El Centro Regional de Investigaciones Biomédicas, Universidad de Castilla-La Mancha Ciudad Real, Spain
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18
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Crowther AJ, Song J. Activity-dependent signaling mechanisms regulating adult hippocampal neural stem cells and their progeny. Neurosci Bull 2014; 30:542-56. [PMID: 25082534 DOI: 10.1007/s12264-014-1453-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2014] [Accepted: 07/15/2014] [Indexed: 01/13/2023] Open
Abstract
Adult neural stem cells (NSCs) reside in a restricted microenvironment, where their development is controlled by subtle and presently underexplored cues. This raises a significant question: what instructions must be provided by this supporting niche to regulate NSC development and functions? Signaling from the niche is proposed to control many aspects of NSC behavior, including balancing the quiescence and proliferation of NSCs, determining the cell division mode (symmetric versus asymmetric), and preventing premature depletion of stem cells to maintain neurogenesis throughout life. Interactions between neurogenic niches and NSCs also govern the homeostatic regulation of adult neurogenesis under diverse physiological, environmental, and pathological conditions. An important implication from revisiting many previously-identifi ed regulatory factors is that most of them (e.g., the antidepressant fluoxetine and exercise) affect gross neurogenesis by acting downstream of NSCs at the level of intermediate progenitors and neuroblasts, while leaving the NSC pool unaffected. Therefore, it is critically important to address how various niche components, signaling pathways, and environmental stimuli differentially regulate distinct stages of adult neurogenesis.
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Affiliation(s)
- Andrew J Crowther
- Graduate Program of Neurobiology Curriculum, University of North Carolina, Chapel Hill, NC, 27599, USA
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19
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van der Zee EA. Synapses, spines and kinases in mammalian learning and memory, and the impact of aging. Neurosci Biobehav Rev 2014; 50:77-85. [PMID: 24998408 DOI: 10.1016/j.neubiorev.2014.06.012] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 06/21/2014] [Accepted: 06/24/2014] [Indexed: 02/04/2023]
Abstract
Synapses are the building blocks of neuronal networks. Spines, the postsynaptic elements, are morphologically the most plastic part of the synapse. It is thought that spine plasticity underlies learning and memory processes, driven by kinases and cytoskeleton protein reorganization. Spine strength depends primarily on the number of incorporated glutamatergic receptors, which are more numerous in larger spines. Intrinsic and circadian fluctuations, occurring independently of presynaptic stimulation, demonstrate the native instability of spines. Despite innate spine instability some spines remain intact lifelong. Threats to spine survival are reduced by physical and mental activity, and declining sensory input, conditions characteristic for aging. Large spines are considered less vulnerable than thin spines, and in the older brain large spines are more abundant, whereas the thin spines are functionally weaker. It can be speculated that this shift towards memory spines contributes to enhanced retention of remote memories typically seen in the elderly. Gaining further insight in spine plasticity regulation, its homeostatic nature and how to maintain spine health will be important future research topics in Neuroscience.
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Affiliation(s)
- Eddy A van der Zee
- Department of Molecular Neurobiology, Centre for Behaviour and Neurosciences, University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands.
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20
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Improvements in memory after medial septum stimulation are associated with changes in hippocampal cholinergic activity and neurogenesis. BIOMED RESEARCH INTERNATIONAL 2014; 2014:568587. [PMID: 25101288 PMCID: PMC4101966 DOI: 10.1155/2014/568587] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Revised: 06/04/2014] [Accepted: 06/05/2014] [Indexed: 01/09/2023]
Abstract
Deep brain stimulation (DBS) has been found to have therapeutic effects in patients with dementia, but DBS mechanisms remain elusive. To provide evidence for the effectiveness of DBS as a treatment for dementia, we performed DBS in a rat model of dementia with intracerebroventricular administration of 192 IgG-saporins. We utilized four groups of rats, group 1, unlesioned control; group 2, cholinergic lesion; group 3, cholinergic lesion plus medial septum (MS) electrode implantation (sham stimulation); group 4, cholinergic lesions plus MS electrode implantation and stimulation. During the probe test in the water maze, performance of the lesion group decreased for measures of time spent and the number of swim crossings over the previous platform location. Interestingly, the stimulation group showed an equivalent performance to the normal group on all measures. And these are partially reversed by the electrode implantation. Acetylcholinesterase activity in the hippocampus was decreased in lesion and implantation groups, whereas activity in the stimulation group was not different from the normal group. Hippocampal neurogenesis was increased in the stimulation group. Our results revealed that DBS of MS restores spatial memory after damage to cholinergic neurons. This effect is associated with an increase in hippocampal cholinergic activity and neurogenesis.
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21
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Yoo DY, Choi JH, Kim W, Nam SM, Jung HY, Kim JH, Won MH, Yoon YS, Hwang IK. Effects of luteolin on spatial memory, cell proliferation, and neuroblast differentiation in the hippocampal dentate gyrus in a scopolamine-induced amnesia model. Neurol Res 2013; 35:813-20. [DOI: 10.1179/1743132813y.0000000217] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Dae Young Yoo
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Jung Hoon Choi
- Department of AnatomyCollege of Veterinary Medicine, Kangwon National University, Chuncheon, South Korea
| | - Woosuk Kim
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Sung Min Nam
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Hyo Young Jung
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Jong Hwi Kim
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - Moo-Ho Won
- Department of NeurobiologySchool of Medicine, Kangwon National University, Chuncheon, South Korea
| | - Yeo Sung Yoon
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
| | - In Koo Hwang
- Department of Anatomy and Cell BiologyCollege of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
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Benninghoff J, Rauh W, Brantl V, Schloesser RJ, Moessner R, Möller HJ, Rujescu D. Cholinergic impact on neuroplasticity drives muscarinic M1 receptor mediated differentiation into neurons. World J Biol Psychiatry 2013; 14:241-6. [PMID: 22022845 DOI: 10.3109/15622975.2011.624121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES Increasing evidence indicates that canonical neurotransmitters act as regulatory signals during neuroplasticity. Here, we report that muscarinic cholinergic neurotransmission stimulates differentiation of adult neural stem cells in vitro. METHODS Adult neural stem cells (ANSC) dissociated from the adult mouse hippocampus were expanded in culture with basic fibroblast growth factor (BFGF) and epidermal growth factor (EGF). RESULTS Carbachol (CCh), an analog of acetylcholine (ACh) significantly enhanced de novo differentiation into neurons on bFGF- and EGF-deprived stem cells as shown by the percentage of TUJ1 positive cells. By contrast, pirenzepine (PIR), a muscarinic M1 receptor antagonist, reduced the generation of neurons. CONCLUSION Activation of cholinergic signaling drives the de novo differentiation of uncommitted stem cells into neurons. These effects appear to be predominantly mediated via the muscarinic M1 receptor subtype.
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Affiliation(s)
- Jens Benninghoff
- Department of Psychiatry, LMU-University of Munich, Munich, Germany.
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23
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Abstract
Plasticity in the adult brain enables lifelong learning. The fundamental mechanism of adult neural plasticity is activity-dependent reorganization of pre-existing structure, in contrast to the widespread cellular proliferation and migration that occurs during development. Whereas adult hippocampal dentate gyrus continuously generates cohorts of neurons, and newborn neurons integrate into the existing neural circuit under the regulation of existing global and local neural activity, demonstrating a unique cellular and synaptic flexibility in adult brain. Exhibiting an enhanced structural and synaptic plasticity during the maturation, adult-born hippocampal neurons may represent a unique population for hippocampal function. Current evidence indicates that lifelong addition of new hippocampal neurons may extend early developmental plasticity to adulthood, which continuously rejuvenates adult brain. We reviewed most recent advancements in exploring the circuit and behavioral role of adult-born hippocampal neurons.
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Affiliation(s)
- Yan Gu
- Department of Neurobiology and Behavior, Stony Brook University, 100 Nicolls Road, Stony Brook, NY, 11794, USA,
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24
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Veena J, Rao BSS, Srikumar BN. Regulation of adult neurogenesis in the hippocampus by stress, acetylcholine and dopamine. J Nat Sci Biol Med 2012; 2:26-37. [PMID: 22470231 PMCID: PMC3312696 DOI: 10.4103/0976-9668.82312] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Neurogenesis is well-established to occur during adulthood in two regions of the brain, the subventricular zone (SVZ) and the subgranular zone (SGZ) of the dentate gyrus in the hippocampus. Research for more than two decades has implicated a role for adult neurogenesis in several brain functions including learning and effects of antidepressants and antipsychotics. Clear understanding of the players involved in the regulation of adult neurogenesis is emerging. We review evidence for the role of stress, dopamine (DA) and acetylcholine (ACh) as regulators of neurogenesis in the SGZ. Largely, stress decreases neurogenesis, while the effects of ACh and DA depend on the type of receptors mediating their action. Increasingly, the new neurons formed in adulthood are potentially linked to crucial brain processes such as learning and memory. In brain disorders like Alzheimer and Parkinson disease, stress-induced cognitive dysfunction, depression and age-associated dementia, the necessity to restore brain functions is enormous. Activation of the resident stem cells in the adult brain to treat neuropsychiatric disorders has immense potential and understanding the mechanisms of regulation of adult neurogenesis by endogenous and exogenous factors holds the key to develop therapeutic strategies for the debilitating neurological and psychiatric disorders.
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Affiliation(s)
- J Veena
- Laboratoire Psynugen, Université Bordeaux 2, Bordeaux, France
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Zarrindast MR, Ardjmand A, Ahmadi S, Rezayof A. Activation of dopamine D1 receptors in the medial septum improves scopolamine-induced amnesia in the dorsal hippocampus. Behav Brain Res 2012; 229:68-73. [DOI: 10.1016/j.bbr.2011.12.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 12/16/2011] [Accepted: 12/21/2011] [Indexed: 11/28/2022]
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Ransome MI, Hannan AJ. Behavioural state differentially engages septohippocampal cholinergic and GABAergic neurons in R6/1 Huntington’s disease mice. Neurobiol Learn Mem 2012; 97:261-70. [DOI: 10.1016/j.nlm.2012.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 12/18/2011] [Accepted: 01/04/2012] [Indexed: 12/15/2022]
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27
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Amrein I, Isler K, Lipp HP. Comparing adult hippocampal neurogenesis in mammalian species and orders: influence of chronological age and life history stage. Eur J Neurosci 2012; 34:978-87. [PMID: 21929629 DOI: 10.1111/j.1460-9568.2011.07804.x] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Adult hippocampal neurogenesis is a prominent event in rodents. In species with longer life expectancies, newly born cells in the adult dentate gyrus of the hippocampal formation are less abundant or can be completely absent. Several lines of evidence indicate that the regulatory mechanisms of adult neurogenesis differ between short- and long-lived mammals. After a critical appraisal of the factors and problems associated with comparing different species, we provide a quantitative comparison derived from seven laboratory strains of mice (BALB, C57BL/6, CD1, outbred) and rats (F344, Sprague-Dawley, Wistar), six other rodent species of which four are wild-derived (wood mouse, vole, spiny mouse and guinea pig), three non-human primate species (marmoset and two macaque species) and one carnivore (red fox). Normalizing the number of proliferating cells to total granule cell number, we observe an overall exponential decline in proliferation that is chronologically equal between species and orders and independent of early developmental processes and life span. Long- and short-lived mammals differ with regard to major life history stages; at the time points of weaning, age at first reproduction and average life expectancy, long-lived primates and foxes have significantly fewer proliferating cells than rodents. Although the database for neuronal differentiation is limited, we find indications that the extent of neuronal differentiation is subject to species-specific selective adaptations. We conclude that absolute age is the critical factor regulating cell genesis in the adult hippocampus of mammals. Ontogenetic and ecological factors primarily influence the regulation of neuronal differentiation rather than the rate of cell proliferation.
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Affiliation(s)
- Irmgard Amrein
- Institute of Anatomy, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
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28
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Yoo DY, Woo YJ, Kim W, Nam SM, Lee BH, Yeun GH, Yoon YS, Won MH, Park JH, Hwang IK. Effects of a new synthetic butyrylcholinesterase inhibitor, HBU-39, on cell proliferation and neuroblast differentiation in the hippocampal dentate gyrus in a scopolamine-induced amnesia animal model. Neurochem Int 2011; 59:722-8. [DOI: 10.1016/j.neuint.2011.06.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Revised: 06/23/2011] [Accepted: 06/27/2011] [Indexed: 01/13/2023]
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Itou Y, Nochi R, Kuribayashi H, Saito Y, Hisatsune T. Cholinergic activation of hippocampal neural stem cells in aged dentate gyrus. Hippocampus 2011; 21:446-59. [PMID: 20054812 DOI: 10.1002/hipo.20761] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Adult hippocampal neurogenesis contributes to the hippocampal circuit's role in cognitive functioning. New neurons are generated from hippocampal neural stem cells (NSCs) throughout life, but their generation is substantially diminished in aged animals due to a decrease in NSC proliferation. Because acetylcholine (ACh) is an important neurotransmitter released in the hippocampus during learning and exercise that is known to decrease with aging, we investigated whether aged NSCs can respond to ACh. In this study, we found that cholinergic stimulation has a positive effect on NSC proliferation in both young adult (8-12 weeks old) and aged mice (>2 years old). In fresh hippocampal slices, we observed a rapid calcium increase in NSCs in the dentate gyrus after muscarinic cholinergic stimulation, in both age groups. Furthermore, we found that the exercise-induced promotion of aged NSC proliferation was abrogated by the specific lesioning of the septal cholinergic system. In turn, cholinergic activation by either eserine (physostigmine) or donepezil treatment promoted the proliferation of NSCs in aged mice. These results indicate that NSCs respond to cholinergic stimulation by proliferating in aged animals. Physiological and/or pharmacological cholinergic stimulation(s) may ameliorate cognitive decline in aged animals, by supporting adult hippocampal neurogenesis.
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Affiliation(s)
- Yoshie Itou
- Department of Integrated Biosciences, The University of Tokyo, Kashiwa, Chiba 277-8562, Japan
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30
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Veena J, Srikumar BN, Mahati K, Raju TR, Shankaranarayana Rao BS. Oxotremorine treatment restores hippocampal neurogenesis and ameliorates depression-like behaviour in chronically stressed rats. Psychopharmacology (Berl) 2011; 217:239-53. [PMID: 21494789 DOI: 10.1007/s00213-011-2279-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Accepted: 03/22/2011] [Indexed: 12/21/2022]
Abstract
RATIONALE Chronic stress results in cognitive impairment, affects hippocampal neurogenesis and is known to precipitate affective disorders such as depression. In addition to stress, neurotransmitters such as acetylcholine (ACh) modulate adult neurogenesis. Earlier, we have shown that oxotremorine, a cholinergic muscarinic agonist, ameliorates stress-induced cognitive impairment and restores cholinergic function. OBJECTIVES In the current study, we have looked into the possible involvement of adult neurogenesis in cognitive restoration by oxotremorine. Further, we have assessed the effect of oxotremorine treatment on depression-like behaviour and hippocampal volumes in stressed animals. METHODS Chronic restraint stressed rats were treated with either vehicle or oxotremorine. For neurogenesis studies, proliferation, survival and differentiation of the progenitor cells in the hippocampus were examined using 5'-bromo-2-deoxyuridine immunohistochemistry. Depression-like behaviour was evaluated using forced swim test (FST) and sucrose consumption test (SCT). Volumes were estimated using Cavalieri's estimator. RESULTS Hippocampal neurogenesis was severely decreased in stressed rats. Ten days of oxotremorine treatment to stressed animals partially restored proliferation and survival, while it completely restored the differentiation of the newly formed cells. Stressed rats showed increased immobility and decreased sucrose preference in the FST and SCT, respectively, and oxotremorine ameliorated this depression-like behaviour. In addition, oxotremorine treatment recovered the stress-induced decrease in hippocampal volume. CONCLUSIONS These results indicate that the restoration of impaired neurogenesis and hippocampal volume could be associated with the behavioural recovery by oxotremorine. Our results imply the muscarinic regulation of adult neurogenesis and incite the potential utility of cholinomimetics in ameliorating cognitive dysfunction in stress-related disorders.
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Affiliation(s)
- J Veena
- Department of Neurophysiology, National Institute of Mental Health and Neuro Sciences (NIMHANS), Hosur Road, PB # 2900, Bangalore, 560 029, India
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31
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Dagytė G, Den Boer JA, Trentani A. The cholinergic system and depression. Behav Brain Res 2011; 221:574-82. [PMID: 20170685 DOI: 10.1016/j.bbr.2010.02.023] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2010] [Accepted: 02/10/2010] [Indexed: 01/07/2023]
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32
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Vetreno RP, Klintsova A, Savage LM. Stage-dependent alterations of progenitor cell proliferation and neurogenesis in an animal model of Wernicke-Korsakoff syndrome. Brain Res 2011; 1391:132-46. [PMID: 21440532 PMCID: PMC3087287 DOI: 10.1016/j.brainres.2011.03.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 02/19/2011] [Accepted: 03/18/2011] [Indexed: 10/18/2022]
Abstract
Alcohol-induced Wernicke-Korsakoff syndrome (WKS) culminates in bilateral diencephalic lesion and severe amnesia. Using the pyrithiamine-induced thiamine deficiency (PTD) animal paradigm of WKS, our laboratory has demonstrated hippocampal dysfunction in the absence of gross anatomical pathology. Extensive literature has revealed reduced hippocampal neurogenesis following a neuropathological insult, which might contribute to hippocampus-based learning and memory impairments. Thus, the current investigation was conducted to determine whether PTD treatment altered hippocampal neurogenesis in a stage-dependent fashion. Male Sprague-Dawley rats were assigned to one of 4 stages of thiamine deficiency based on behavioral symptoms: pre-symptomatic stage, ataxic stage, early post-opisthotonus stage, or the late post-opisthotonus stage. The S-phase mitotic marker 5'-bromo-2'-deoxyuridine (BrdU) was administered at the conclusion of each stage following thiamine restoration and subjects were perfused 24 hours or 28 days after BrdU to assess cellular proliferation or neurogenesis and survival, respectively. Dorsal hippocampal sections were immunostained for BrdU (proliferating cell marker), NeuN (neurons), GFAP (astrocytes), Iba-1 (microglia), and O4 (oligodendrocytes). The PTD treatment increased progenitor cell proliferation and survival during the early post-opisthotonus stage. However, levels of neurogenesis were reduced during this stage as well as the late post-opisthotonus stage where there was also an increase in astrocytogenesis. The diminished numbers of newly generated neurons (BrdU/NeuN co-localization) was paralleled by increased BrdU cells that did not co-localize with any of the phenotypic markers during these later stages. These data demonstrate that long-term alterations in neurogenesis and gliogenesis might contribute to the observed hippocampal dysfunction in the PTD model and human WKS.
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Affiliation(s)
- Ryan P Vetreno
- Department of Psychology, Behavioral Neuroscience, State University of New York at Binghamton, Vestal, NY 13902, USA.
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Spatial memory alterations by activation of septal 5HT 1A receptors: no implication of cholinergic septohippocampal neurons. Psychopharmacology (Berl) 2011; 214:437-54. [PMID: 20959966 DOI: 10.1007/s00213-010-2049-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2010] [Accepted: 10/03/2010] [Indexed: 02/06/2023]
Abstract
INTRODUCTION In rats, activation of medial septum (MS) 5-HT(1A) receptors with the 5-HT(1A)/5-HT(7) receptor agonist 8-OH-DPAT disrupts encoding and consolidation, but not retrieval of a spatial memory in the water maze task. These findings might be explained by an action of 8-OH-DPAT on 5-HT(1A) receptors located on cholinergic neurons which the drug could transiently hyperpolarise. If so, selective damage of these neurons should mimic the effects of 8-OH-DPAT, or, at least, synergistically interfere with them. METHODS To test this hypothesis, rats were subjected to intraseptal infusions of 8-OH-DPAT (or phosphate-buffered saline) during acquisition of a water maze task before and/or after 192 IgG-saporin-induced MS cholinergic lesion (vs. sham-operated). RESULTS We confirmed that only pre-acquisition intraseptal 8-OH-DPAT infusions prevented learning and subsequent drug-free retrieval of the platform location in intact rats and found that (1) the cholinergic lesion did not prevent recall of the platform location, and (2) the impairing effects of 8-OH-DPAT were similar in sham-operated and lesioned rats, whether naïve or not, to the task before lesion surgery. CONCLUSIONS An action of 8-OH-DPAT on only MS cholinergic neurons is not sufficient to account for the drug-induced memory impairments. A concomitant 8-OH-DPAT-induced hyperpolarisation of cholinergic and/or GABAergic and/or glutamatergic neurons (intact rats), or of only GABAergic and/or glutamatergic ones after cholinergic lesion, might be necessary to obliterate task acquisition, confirming that, in the MS, (1) the three neuronal populations could cooperate to process hippocampal-dependent information, and (2) non-cholinergic septohippocampal neurons might be more important than cholinergic ones in serotonin-induced modulation of hippocampus-dependent memory processing.
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Cholinergic influences on cortical development and adult neurogenesis. Behav Brain Res 2011; 221:379-88. [PMID: 21272598 DOI: 10.1016/j.bbr.2011.01.021] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 01/10/2011] [Accepted: 01/13/2011] [Indexed: 11/22/2022]
Abstract
In this review, we focus on immature neurons and their regulation by the cholinergic system, both during cortical development as well as during adult neurogenesis. We discuss various studies that indicate roles for acetylcholine in precursor development and neuronal differentiation. Cholinergic neurons projecting from the basal forebrain innervate the cerebral cortex during critical periods of neuronal development. Acetylcholine stimulation may help to promote a favourable environment for neuronal maturation. Afferents and their cortical target cells interact and are likely to influence each other during the establishment and refinement of connections. Intracortical cholinergic interneurons similarly have a local effect on cortical circuits. Reduced cholinergic innervation during development hence leads to reduced cortical thickness and dendritic abnormalities. Acetylcholine is also likely to play a critical role in neuronal plasticity, as shown in the visual and barrel cortices. Spontaneous nicotinic excitation is also important during a brief developmental window in the first postnatal weeks leading to waves of neural activity, likely to have an effect on neurite extension, target selection and synaptogenesis. In the hippocampus such activity plays a role in the maturation of GABAergic synapses during the developmental shift from depolarizing to hyperpolarizing transmission. The cholinergic system also seems likely to regulate hippocampal neurogenesis in the adult, positively promoting proliferation, differentiation, integration and potentially survival of newborn neurons.
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Yoo DY, Kim W, Yoo KY, Lee CH, Choi JH, Kang IJ, Yoon YS, Kim DW, Won MH, Hwang IK. Effects of Nelumbo nucifera rhizome extract on cell proliferation and neuroblast differentiation in the hippocampal dentate gyrus in a scopolamine-induced amnesia animal model. Phytother Res 2010; 25:809-15. [PMID: 21086545 DOI: 10.1002/ptr.3337] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 09/27/2010] [Accepted: 09/30/2010] [Indexed: 11/08/2022]
Abstract
A large aquatic herb, Nelumbo nucifera Gaertn, has psychopharmacological effects similar to minor tranquillizers and antistress agents. This study examined the effects of Nelumbo nucifera rhizome extracts (NRE) on cell proliferation and neuroblast differentiation in the hippocampal dentate gyrus (DG) of a rat model of scopolamine-induced amnesia. Immunohistochemical markers included Ki67, an endogenous marker for active cell cycle, and doublecortin (DCX), a marker for immature neurons and migratory neuroblasts. Scopolamine was administered for 28 days via an ALzet minipump (44 mg/mL delivered at 2.5 µL/h). NRE was administered by gavage, 1 g/kg per day for 28 days. The administration of scopolamine significantly reduced the number of Ki67- and DCX-immunoreactive cells in the DG, whereas scopolamine did not induce any significant changes in mature neurons in the DG. The administration of NRE significantly ameliorated the scopolamine-induced reduction of Ki67- and DCX-immunoreactive cells in the DG. In addition, the administration of NRE significantly restored the scopolamine-induced reduction of brain-derived neurotrophic factor in DG homogenates. These results suggest that NRE can ameliorate the scopolamine-induced reductions of cell proliferation, neuroblast differentiation and BDNF levels.
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Affiliation(s)
- Dae Young Yoo
- Department of Anatomy and Cell Biology, College of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul 151-742, South Korea
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Lecourtier L, de Vasconcelos AP, Leroux E, Cosquer B, Geiger K, Lithfous S, Cassel JC. Septohippocampal pathways contribute to system consolidation of a spatial memory: sequential implication of GABAergic and cholinergic neurons. Hippocampus 2010; 21:1277-89. [PMID: 20623740 DOI: 10.1002/hipo.20837] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/14/2010] [Indexed: 11/10/2022]
Abstract
Studies of the neuropharmacological substrates of spatial memory formation have focused on the contribution of septohippocampal pathways. Although these pathways include, among others, cholinergic and GABAergic fibers innervating the hippocampus, research has essentially been oriented towards the role of their cholinergic component. Recently, a few studies investigated the role of GABAergic septohippocampal projections. These only focused on almost immediate or recent memory and yielded discrepant results. GABAergic lesions impaired learning or had no effects. Given the role of the hippocampus in memory consolidation and the potential modulatory influence of the septum on hippocampal function, it is relevant to study the role of the septohippocampal interface in memory stabilization. We performed investigations with relatively selective lesions of GABAergic (using oxerin-saporin) or/and cholinergic (using 192 IgG-saporin) medial septum/vertical limb of the diagonal band of Broca (MS/vDBB) neurons in rats, and assessed acquisition of a spatial memory and its subsequent recall in the water maze. Following a 6-day training phase during which all groups improved performance to comparable levels, retention was tested 1, 5, or 25 days later. At the 1-day delay, all groups performed above chance and did not differ significantly among each other. At the 5-day delay, only rats with GABAergic or combined lesions exhibited a retention deficit. At the 25-day delay, all three lesion groups performed at chance level; in these groups, performance was significantly lower than that found in sham-operated rats. Immunochemical and histochemical verifications of the lesion extent/selectivity showed extensive GABAergic damage after intraseptal orexin-saporin infusions or cholinergic damage after 192 IgG-saporin infusions, with relatively limited damage to the other neurotransmitter system. Our data show that GABAergic and cholinergic septohippocampal neurons both contribute to memory stabilization, and could do so in a sequential way: GABAergic processes could be engaged at an earlier stage than cholinergic ones during system consolidation of a spatial memory.
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Affiliation(s)
- Lucas Lecourtier
- Laboratoire d'Imagerie et de Neurosciences Cognitives, FRE 3289, Université de Strasbourg - CNRS, Faculté de Psychologie, 67000 Strasbourg, France
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Zechel S, Werner S, Unsicker K, von Bohlen und Halbach O. Expression and Functions of Fibroblast Growth Factor 2 (FGF-2) in Hippocampal Formation. Neuroscientist 2010; 16:357-73. [DOI: 10.1177/1073858410371513] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Among the 23 members of the fibroblast growth factor (FGF) family, FGF-2 is the most abundant one in the central nervous system. Its impact on neural cells has been profoundly investigated by in vitro and in vivo studies as well as by gene knockout analyses during the past 2 decades. Key functions of FGF-2 in the nervous system include roles in neurogenesis, promotion of axonal growth, differentiation in development, and maintenance and plasticity in adulthood. From a clinical perspective, its prominent role for the maintenance of lesioned neurons (e.g., ischemia and following transection of fiber tracts) is of particular relevance. In the unlesioned brain, FGF-2 is involved in synaptic plasticity and processes attributed to learning and memory. The focus of this review is on the expression of FGF-2 and its receptors in the hippocampal formation and the physiological and pathophysiological roles of FGF-2 in this region during development and adulthood.
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Affiliation(s)
- Sabrina Zechel
- Division of Molecular Neurobiology, Department of Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Sandra Werner
- Department of Molecular Embryology, Institute of Anatomy & Cell Biology, University of Freiburg, Freiburg, Germany
| | - Klaus Unsicker
- Department of Molecular Embryology, Institute of Anatomy & Cell Biology, University of Freiburg, Freiburg, Germany
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Nakajima Y, Inokuchi Y, Shimazawa M, Otsubo K, Ishibashi T, Hara H. Astaxanthin, a dietary carotenoid, protects retinal cells against oxidative stress in-vitro and in mice in-vivo. J Pharm Pharmacol 2010. [DOI: 10.1211/jpp.60.10.0013] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Abstract
We have investigated whether astaxanthin exerted neuroprotective effects in retinal ganglion cells in-vitro and in-vivo. In-vitro, retinal damage was induced by 24-h hydrogen peroxide (H2O2) exposure or serum deprivation, and cell viability was measured using a WST assay. In cultured retinal ganglion cells (RGC-5, a rat ganglion cell-line transformed using E1A virus), astaxanthin inhibited the neurotoxicity induced by H2O2 or serum deprivation, and reduced the intracellular oxidation induced by various reactive oxygen species (ROS). Furthermore, astaxanthin decreased the radical generation induced by serum deprivation in RGC-5. In mice in-vivo, astaxanthin (100 mg kg−1, p.o., four times) reduced the retinal damage (a decrease in retinal ganglion cells and in thickness of inner plexiform layer) induced by intravitreal N-methyl-d-aspartate (NMDA) injection. Furthermore, astaxanthin reduced the expressions of 4-hydroxy-2-nonenal (4-HNE)-modified protein (indicator of lipid peroxidation) and 8-hydroxy-deoxyguanosine (8-OHdG; indicator of oxidative DNA damage). These findings indicated that astaxanthin had neuroprotective effects against retinal damage in-vitro and in-vivo, and that its protective effects may have been partly mediated via its antioxidant effects.
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Affiliation(s)
- Yoshimi Nakajima
- Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Yuta Inokuchi
- Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Masamitsu Shimazawa
- Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Kazumasa Otsubo
- Fine Chemicals Marketing Department, Fine Chemicals Division, Asahi Kasei Pharma Corporation, 9-1 Kanda Mitoshiro-cho, Chiyoda-ku, Tokyo 101-8481, Japan
| | - Takashi Ishibashi
- Biotechnology Business Section, Merchandise Business Department, Nippon Oil Corporation, 3-12 Nishi Shimbashi 1-chome, Minato-ku, Tokyo 105-8412, Japan
| | - Hideaki Hara
- Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
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Van Kampen JM, Eckman CB. Agonist-induced restoration of hippocampal neurogenesis and cognitive improvement in a model of cholinergic denervation. Neuropharmacology 2009; 58:921-9. [PMID: 20026137 DOI: 10.1016/j.neuropharm.2009.12.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 12/03/2009] [Accepted: 12/08/2009] [Indexed: 10/20/2022]
Abstract
Loss of basal forebrain cholinergic innervation of the hippocampus and severe neuronal loss within the hippocampal CA1 region are early hallmarks of Alzheimer's disease, and are strongly correlated with cognitive status. Various therapeutic approaches involve attempts to enhance neurotransmission or to provide some level of neuroprotection for remaining cells. An alternative approach may involve the generation of new cells to replace those lost in AD. Indeed, a simple shift in the balance between cell generation and cell loss may slow disease progression and possibly even reverse existing cognitive deficits. One potential neurogenic regulator might be acetylcholine, itself, which has been shown to play a critical role in hippocampal development. Here, we report the effects of various cholinergic compounds on indices of hippocampal neurogenesis, demonstrating a significant induction following pharmacological activation of muscarinic M1 receptors, located on hippocampal progenitors in the adult brain. This is the first report that a small-molecule agonist may induce neurogenesis in the hippocampal CA1 region. Furthermore, such treatment reversed deficits in markers of neurogenesis and spatial working memory triggered by cholinergic denervation in a rodent model. This study suggests the use of small molecule, receptor agonists may represent a novel means to trigger the restoration of specific neuronal populations lost to a variety of neurodegenerative disorders, such as Parkinson's, Alzheimer's, Huntington's and Amyotrophic Lateral Sclerosis.
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Van der Borght K, Kóbor-Nyakas DÉ, Klauke K, Eggen BJ, Nyakas C, Van der Zee EA, Meerlo P. Physical exercise leads to rapid adaptations in hippocampal vasculature: Temporal dynamics and relationship to cell proliferation and neurogenesis. Hippocampus 2009; 19:928-36. [DOI: 10.1002/hipo.20545] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Ho NF, Han SP, Dawe GS. Effect of voluntary running on adult hippocampal neurogenesis in cholinergic lesioned mice. BMC Neurosci 2009; 10:57. [PMID: 19500352 PMCID: PMC2711090 DOI: 10.1186/1471-2202-10-57] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 06/05/2009] [Indexed: 11/10/2022] Open
Abstract
Background Cholinergic neuronal dysfunction of the basal forebrain is observed in patients with Alzheimer's disease and dementia, and has been linked to decreased neurogenesis in the hippocampus, a region involved in learning and memory. Running is a robust inducer of adult hippocampal neurogenesis. This study aims to address the effect of running on hippocampal neurogenesis in lesioned mice, where septohippocampal cholinergic neurones have been selectively eliminated in the medial septum and diagonal band of Broca of the basal forebrain by infusion of mu-p75-saporin immunotoxin. Results Running increased the number of newborn cells in the dentate gyrus of the hippocampus in cholinergic denervated mice compared to non-lesioned mice 24 hours after injection of bromodeoxyuridine (BrdU). Although similar levels of surviving cells were present in cholinergic depleted animals and their respective controls four weeks after injection of BrdU, the majority of progenitors that proliferate in response to the initial period of running were not able to survive beyond one month without cholinergic input. Despite this, the running-induced increase in the number of surviving neurones was not affected by cholinergic depletion. Conclusion The lesion paradigm used here models aspects of the cholinergic deficits associated with Alzheimer's Disease and aging. We showed that running still increased the number of newborn cells in the adult hippocampal dentate gyrus in this model of neurodegenerative disease.
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Affiliation(s)
- New Fei Ho
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Centre for Life Sciences (CeLS), Level 4, 28 Medical Drive, 117456, Singapore.
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Inokuchi Y, Shimazawa M, Nakajima Y, Komuro I, Matsuda T, Baba A, Araie M, Kita S, Iwamoto T, Hara H. A Na+/Ca2+ exchanger isoform, NCX1, is involved in retinal cell death after N-methyl-D-aspartate injection and ischemia-reperfusion. J Neurosci Res 2009; 87:906-17. [PMID: 18855935 DOI: 10.1002/jnr.21906] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We investigated the expression of Na(+)/Ca(2+) exchanger (NCX) and the functional role of NCX in retinal damage by using NCX1-heterozygous deficient mice (NCX1(+/-)) and SEA0400 (2-[4-[(2,5-difluorophenyl)methoxy] phenoxy]-5-ethoxyaniline), a selective NCX inhibitor in vivo. We also examined the role of NCX in oxygen-glucose deprivation (OGD) stress with a retinal ganglion cell line (RGC-5) cell culture in vitro. The expression of NCX1 was confirmed and entirely localized in retina by immunoblotting and immunohistochemistry, respectively. NCX1(+/-) mice possessed significant protection against retinal damage induced by intravitreal injection of N-methyl-D-aspartate (NMDA). SEA0400 at 3 and 10 mg/kg significantly reduced NMDA- or high intraocular pressure-induced retinal cell damage in mice. Furthermore, SEA0400 reduced the number of TUNEL (terminal deoxynucleotidyl transferase dUTP nick-end labeling)-positive cells and the expression of phosphorylated mitogen-activated protein kinases (ERK1/2, JNK, p38) induced by NMDA injection. In RGC-5, SEA0400 at 0.3 and 1 microM significantly inhibited OGD-induced cell damage. OGD-induced cell damage was aggravated by ouabain (a Na(+),K(+)-ATPase inhibitor) at 100 microM, and this increased damage was significantly reduced by SEA0400 at 1 microM. In conclusion, these results suggest that NCX1 may play a role in retinal cell death induced by NMDA and ischemia-reperfusion.
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Affiliation(s)
- Y Inokuchi
- Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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Magnetic resonance spectroscopy outcomes from a comprehensive magnetic resonance study of children with fetal alcohol spectrum disorders. Magn Reson Imaging 2009; 27:760-78. [PMID: 19342189 DOI: 10.1016/j.mri.2009.01.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2008] [Revised: 12/27/2008] [Accepted: 01/09/2009] [Indexed: 01/25/2023]
Abstract
Magnetic resonance (MR) technology offers noninvasive methods for in vivo assessment of neuroabnormalities. A comprehensive neuropsychological/behavioral, MR imaging (MRI), MR spectroscopy (MRS) and functional MRI (fMRI) assessment was administered to children with fetal alcohol spectrum disorders (FASD) to determine whether global and/or focal abnormalities could be identified and to distinguish diagnostic subclassifications across the spectrum. The four study groups included (1) FAS/partial FAS; (2) static encephalopathy/alcohol exposed (SE/AE); (3) neurobehavioral disorder/alcohol exposed (ND/AE) as diagnosed with the FASD 4-Digit Code; and (4) healthy peers with no prenatal alcohol exposure. Results are presented in four separate reports: MRS (reported here) and neuropsychological/behavioral, MRI and fMRI outcomes (reported separately). MRS was used to compare neurometabolite concentrations [choline (Cho), n-acetyl-aspartate (NAA) and creatine (Cre)] in a white matter region and a hippocampal region between the four study groups. Choline concentration in the frontal/parietal white matter region, lateral to the midsection of the corpus callosum, was significantly lower in FAS/PFAS relative to all other study groups. Choline decreased significantly with decreasing frontal white matter volume and corpus callosum length. These outcomes suggest low choline concentrations may reflect white matter deficits among FAS/PFAS. Choline also decreased significantly with increasing severity of the 4-Digit FAS facial phenotype, increasing impairment in psychological performance and increasing alcohol exposure. NAA and Cre concentrations did not vary significantly. This study provides further evidence of the vulnerability of the cholinergic system in FASD.
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Joosen MJ, Jousma E, van den Boom TM, Kuijpers WC, Smit AB, Lucassen PJ, van Helden HP. Long-term cognitive deficits accompanied by reduced neurogenesis after soman poisoning. Neurotoxicology 2009; 30:72-80. [DOI: 10.1016/j.neuro.2008.11.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Revised: 11/12/2008] [Accepted: 11/24/2008] [Indexed: 01/13/2023]
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Kotani S, Yamauchi T, Teramoto T, Ogura H. Donepezil, an acetylcholinesterase inhibitor, enhances adult hippocampal neurogenesis. Chem Biol Interact 2008; 175:227-30. [DOI: 10.1016/j.cbi.2008.04.004] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2007] [Revised: 04/04/2008] [Accepted: 04/04/2008] [Indexed: 01/01/2023]
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Gray WP. Neuropeptide Y signalling on hippocampal stem cells in health and disease. Mol Cell Endocrinol 2008; 288:52-62. [PMID: 18403103 DOI: 10.1016/j.mce.2008.02.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Revised: 02/07/2008] [Accepted: 02/26/2008] [Indexed: 12/31/2022]
Abstract
Neuropeptides are emerging as key components in the hippocampal neurogenic niche in health and disease, regulating many aspects of neurogenesis and the synaptic integration of newly generated neurons. This review focuses on the role of neuropeptide Y in the control of stem/precursor cells in the postnatal and adult hippocampus. It is likely that neuropeptide Y releasing interneurons are key sensors of neural activity, modulating neurogenesis appropriately. This is likely to be a fruitful area of research for extending our understanding of the control of stem cells in the normal and diseased brain.
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Affiliation(s)
- William P Gray
- University Division of Clinical Neurosciences, Southampton Neurosciences Group, University of Southampton, South Academic Block, Southampton General Hospital, Southampton SO16 6YD, UK.
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Kuhn HG, Cooper-Kuhn CM, Boekhoorn K, Lucassen PJ. Changes in neurogenesis in dementia and Alzheimer mouse models: are they functionally relevant? Eur Arch Psychiatry Clin Neurosci 2007; 257:281-9. [PMID: 17639447 DOI: 10.1007/s00406-007-0732-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease and related dementias are devastating disorders that lead to the progressive decline of cognitive functions. Characteristic features are severe brain atrophy, paralleled by accumulation of beta amyloid and neurofibrillary tangles. With the discovery of neurogenesis in the adult brain, the hopes have risen that these neurodegenerative conditions could be overcome, or at least ameliorated, by the generation of new neurons. The location of the adult neurogenic zones in the hippocampus and the lateral ventricle wall, close to corpus callosum and neocortex, indicates strategic positions for potential repair processes. However, we also need to consider that the generation of new neurons is possibly involved in cognitive functions and could, therefore, be influenced by disease pathology. Moreover, aberrant neurogenic mechanisms could even be a part of the pathological events of neurodegenerative diseases. It is the scope of this review to summarize and analyze the recent data from neurogenesis research with respect to Alzheimer's disease and its animal models.
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Affiliation(s)
- H Georg Kuhn
- Center for Brain Repair and Rehabilitation, Institute for Neuroscience and Physiology, Göteborg University, Medicianregatan 11, 40530 Göteborg, Sweden.
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Abstract
Advances in stem cell biology of the adult brain and the discovery of adult neurogenesis have raised the hope that neurodegenerative disorders might ultimately become amenable to causal therapy. Stem cells contribute to cellular plasticity during the lifespan, and in some sense, brain development never ends. However, neurodegeneration is not just a lack of neuroregeneration, and cell genesis in the adult brain does not apparently lead to successful endogenous responses to neurodegeneration. The brain heals poorly; nevertheless, the onset, severity and progression of neurodegenerative disorders show large variation and can often be influenced by cognitive training and physical activity. Rather than providing endogenous repair, cellular plasticity, including adult neurogenesis might thus contribute to the 'cognitive reserve' that determines how well an organism can compensate for neurodegeneration. From this perspective, neurodegenerative disorders, such as Alzheimer's, Parkinson's, Lewy body and Huntington's diseases, might share a relevant biological principle that even links them to psychiatric disorders, like depression, which are not considered 'neurodegenerative' in a classical sense. However, the integration of neuroregenerative phenomena and most notably adult neurogenesis into the concepts of neurodegeneration is not without problems and remains speculative at present. Adult neurogenesis might be part of the physiological regenerative response and might thereby alter or alleviate symptoms, but it might also become impaired by the disease mechanism and thereby contribute to the symptoms of neurodegeneration. In any case, the extent to which effects on the level of cellular plasticity, be it degenerative or regenerative, are relevant functionally remains to be determined. The present review gives an overview of what is known about cell genesis and adult neurogenesis in neurodegenerative disorders and discusses how cellular plasticity might be part of concepts that integrate aspects of development and cellular plasticity into neurodegeneration.
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Affiliation(s)
- Barbara Steiner
- Volkswagenstiftung Research Group, Dept of Experimental Neurology, Charité University Medicine Berlin, Berlin, Germany
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Aztiria E, Capodieci G, Arancio L, Leanza G. Extensive training in a maze task reduces neurogenesis in the adult rat dentate gyrus probably as a result of stress. Neurosci Lett 2007; 416:133-7. [PMID: 17317003 DOI: 10.1016/j.neulet.2007.01.069] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Revised: 01/23/2007] [Accepted: 01/27/2007] [Indexed: 11/27/2022]
Abstract
It has recently been shown that hippocampal neurogenesis can be modulated either directly or indirectly by ascending cholinergic inputs from the basal forebrain. In the present work, we sought to address whether extended training in a spatial navigation task would affect hippocampal neurogenesis in the presence of a severe and selective cholinergic depletion. Young female rats received stereotaxic injections of the immunotoxin 192 IgG-saporin into the basal forebrain nuclei and/or the cerebellar cortex. Starting from 4 to 5 weeks post-lesion, and for the subsequent 2 weeks, the animals were trained on paradigms of reference and working memory in the water maze and received single daily i.p. injections of bromodeoxyuridine (BrdU) at the end of each testing session. In line with previous observations, a dramatic 80% decrease in neuron proliferation was seen in the dentate gyrus of lesioned animals, as compared to vehicle-injected or intact controls. Interestingly, however, rats subjected to maze training over 2 weeks, irrespective of their learning success, exhibited significantly fewer newborn neurons than matched controls with no maze exposure. Thus, at least for the type of task used here, which has previously been shown to impose a certain degree of stress, extended training and learning does not appear to affect proliferation in the dentate gyrus.
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Affiliation(s)
- E Aztiria
- BRAIN Centre for Neuroscience, Department of Physiology and Pathology, University of Trieste, Via Fleming 22, 34127 Trieste, Italy
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Ramos JG, Varayoud J, Monje L, Moreno-Piovano G, Muñoz-de-Toro M, Luque EH. Diethylstilbestrol alters the population dynamic of neural precursor cells in the neonatal male rat dentate gyrus. Brain Res Bull 2007; 71:619-27. [PMID: 17292805 DOI: 10.1016/j.brainresbull.2006.12.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2006] [Revised: 11/21/2006] [Accepted: 12/05/2006] [Indexed: 01/17/2023]
Abstract
Little is known about how estrogens influence neurogenesis in the newborn male rodent. Herein, we examined the effects of neonatal diethylstilbestrol (DES) exposure on the proliferation and survival of type-1 and type-2 neural precursor cells (NPC) in the dentate gyrus of male rats. This was achieved by exposing newborn male pups to DES on postnatal day (PND) 1, PND3, PND5, and PND7, sacrificed at PND8 or PND21, followed by double immunohistochemistry and morphometric analysis of hippocampal dentate gyrus. Furthermore, vascular endothelial growth factor (VEGF) and brain-derived neurotrophic factor (BDNF) mRNA expression was evaluated in hippocampal tissue blocks by real time RT-PCR. At PND8, the density of total proliferating NPC decreased in DES-treated animals. This reduction was due to a significant decrease in the mitotic rate of type-2 cells only, since type-1 NPCs did not show changes in the proliferation index. Type-2 NPCs expressed the cell-cycle inhibitor p27(kip1) and its expression was clearly augmented in the DES-treated group. Furthermore, the number of apoptotic cells in the dentate gyrus of DES-treated rats decreased. Surprisingly, DES treatment enhanced cell survival and increased NPCs proliferation when animals were examined 14 days after treatment. VEGF mRNA expression showed a positive correlation with NPCs proliferation and BDNF mRNA levels were higher in DES-treated animals at both time points examined. Collectively, these results indicate that hippocampal NPCs proliferation and survival is a critical target of DES exposure during the early postnatal period. VEGF and BDNF are proposed as key mediators of DES-induced NPC mitotic response.
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Affiliation(s)
- Jorge G Ramos
- Laboratorio de Endocrinología y Tumores Hormonodependientes, School of Biochemistry and Biological Sciences, Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
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