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Guarnieri L, Bosco F, Leo A, Citraro R, Palma E, De Sarro G, Mollace V. Impact of micronutrients and nutraceuticals on cognitive function and performance in Alzheimer's disease. Ageing Res Rev 2024; 95:102210. [PMID: 38296163 DOI: 10.1016/j.arr.2024.102210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 01/10/2024] [Accepted: 01/25/2024] [Indexed: 02/13/2024]
Abstract
Alzheimer's disease (AD) is a major global health problem today and is the most common form of dementia. AD is characterized by the formation of β-amyloid (Aβ) plaques and neurofibrillary clusters, leading to decreased brain acetylcholine levels in the brain. Another mechanism underlying the pathogenesis of AD is the abnormal phosphorylation of tau protein that accumulates at the level of neurofibrillary aggregates, and the areas most affected by this pathological process are usually the cholinergic neurons in cortical, subcortical, and hippocampal areas. These effects result in decreased cognitive function, brain atrophy, and neuronal death. Malnutrition and weight loss are the most frequent manifestations of AD, and these are also associated with greater cognitive decline. Several studies have confirmed that a balanced low-calorie diet and proper nutritional intake may be considered important factors in counteracting or slowing the progression of AD, whereas a high-fat or hypercholesterolemic diet predisposes to an increased risk of developing AD. Especially, fruits, vegetables, antioxidants, vitamins, polyunsaturated fatty acids, and micronutrients supplementation exert positive effects on aging-related changes in the brain due to their antioxidant, anti-inflammatory, and radical scavenging properties. The purpose of this review is to summarize some possible nutritional factors that may contribute to the progression or prevention of AD, understand the role that nutrition plays in the formation of Aβ plaques typical of this neurodegenerative disease, to identify some potential therapeutic strategies that may involve some natural compounds, in delaying the progression of the disease.
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Affiliation(s)
- Lorenza Guarnieri
- Section of Pharmacology, Science of Health Department, School of Medicine, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy
| | - Francesca Bosco
- Section of Pharmacology, Science of Health Department, School of Medicine, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy.
| | - Antonio Leo
- Section of Pharmacology, Science of Health Department, School of Medicine, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy; Research Center FAS@UMG, Department of Health Science, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy
| | - Rita Citraro
- Section of Pharmacology, Science of Health Department, School of Medicine, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy; Research Center FAS@UMG, Department of Health Science, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy
| | - Ernesto Palma
- Department of Health Sciences, Institute of Research for Food Safety and Health (IRC-FSH), University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Giovambattista De Sarro
- Section of Pharmacology, Science of Health Department, School of Medicine, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy; Research Center FAS@UMG, Department of Health Science, University "Magna Graecia" of Catanzaro, 88100 Catanzaro, Italy
| | - Vincenzo Mollace
- Department of Health Sciences, Institute of Research for Food Safety and Health (IRC-FSH), University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
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Navarro-López JD, Contreras A, Touyarot K, Herrero AI, Venero C, Cambon K, Gruart A, Delgado-García JM, Sandi C, Jiménez-Díaz L. Acquisition-dependent modulation of hippocampal neural cell adhesion molecules by associative motor learning. Front Neuroanat 2022; 16:1082701. [PMID: 36620194 PMCID: PMC9811386 DOI: 10.3389/fnana.2022.1082701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/07/2022] [Indexed: 12/24/2022] Open
Abstract
It is widely accepted that some types of learning involve structural and functional changes of hippocampal synapses. Cell adhesion molecules neural cell adhesion molecule (NCAM), its polysialylated form polysialic acid to NCAM (PSA-NCAM), and L1 are prominent modulators of those changes. On the other hand, trace eyeblink conditioning, an associative motor learning task, requires the active participation of hippocampal circuits. However, the involvement of NCAM, PSA-NCAM, and L1 in this type of learning is not fully known. Here, we aimed to investigate the possible time sequence modifications of such neural cell adhesion molecules in the hippocampus during the acquisition of a trace eyeblink conditioning. To do so, the hippocampal expression of NCAM, PSA-NCAM, and L1 was assessed at three different time points during conditioning: after one (initial acquisition), three (partial acquisition), and six (complete acquisition) sessions of the conditioning paradigm. The conditioned stimulus (CS) was a weak electrical pulse separated by a 250-ms time interval from the unconditioned stimuli (US, a strong electrical pulse). An acquisition-dependent regulation of these adhesion molecules was found in the hippocampus. During the initial acquisition of the conditioning eyeblink paradigm (12 h after 1 and 3 days of training), synaptic expression of L1 and PSA-NCAM was transiently increased in the contralateral hippocampus to the paired CS-US presentations, whereas, when the associative learning was completed, such increase disappeared, but a marked and bilateral upregulation of NCAM was found. In conclusion, our findings show a specific temporal pattern of hippocampal CAMs expression during the acquisition process, highlighting the relevance of NCAM, PSA-NCAM, and L1 as learning-modulated molecules critically involved in remodeling processes underlying associative motor-memories formation.
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Affiliation(s)
- Juan D. Navarro-López
- Laboratory of Neurophysiology and Behavior, Facultad de Medicina de Ciudad Real, Universidad de Castilla-La Mancha, Ciudad Real, Spain
| | - Ana Contreras
- Laboratory of Neurophysiology and Behavior, Facultad de Medicina de Ciudad Real, Universidad de Castilla-La Mancha, Ciudad Real, Spain
| | - Katia Touyarot
- INRAE, Bordeaux INP, NutriNeuro, University of Bordeaux, Bordeaux, France
| | - Ana I. Herrero
- Department of Psychobiology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - César Venero
- Department of Psychobiology, Universidad Nacional de Educación a Distancia, Madrid, Spain
| | - Karine Cambon
- Direction de la Recherche Fondamentale (DRF), Institut François Jacob, MIRCen, Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA), Fontenay-aux-Roses, France
| | - Agnés Gruart
- Division of Neurosciences, Pablo de Olavide University, Seville, Spain
| | | | - Carmen Sandi
- Laboratory of Behavioral Genetics, Brain Mind Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Lydia Jiménez-Díaz
- Laboratory of Neurophysiology and Behavior, Facultad de Medicina de Ciudad Real, Universidad de Castilla-La Mancha, Ciudad Real, Spain,*Correspondence: Lydia Jiménez-Díaz,
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Ortega-de San Luis C, Ryan TJ. Understanding the physical basis of memory: Molecular mechanisms of the engram. J Biol Chem 2022; 298:101866. [PMID: 35346687 PMCID: PMC9065729 DOI: 10.1016/j.jbc.2022.101866] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 03/08/2022] [Accepted: 03/11/2022] [Indexed: 12/18/2022] Open
Abstract
Memory, defined as the storage and use of learned information in the brain, is necessary to modulate behavior and critical for animals to adapt to their environments and survive. Despite being a cornerstone of brain function, questions surrounding the molecular and cellular mechanisms of how information is encoded, stored, and recalled remain largely unanswered. One widely held theory is that an engram is formed by a group of neurons that are active during learning, which undergoes biochemical and physical changes to store information in a stable state, and that are later reactivated during recall of the memory. In the past decade, the development of engram labeling methodologies has proven useful to investigate the biology of memory at the molecular and cellular levels. Engram technology allows the study of individual memories associated with particular experiences and their evolution over time, with enough experimental resolution to discriminate between different memory processes: learning (encoding), consolidation (the passage from short-term to long-term memories), and storage (the maintenance of memory in the brain). Here, we review the current understanding of memory formation at a molecular and cellular level by focusing on insights provided using engram technology.
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Affiliation(s)
- Clara Ortega-de San Luis
- School of Biochemistry and Immunology and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland.
| | - Tomás J Ryan
- School of Biochemistry and Immunology and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland; Florey Institute of Neuroscience and Mental Health, Melbourne Brain Centre, University of Melbourne, Parkville, Victoria, Australia; Child & Brain Development Program, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario, Canada.
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Tzanoulinou S, Gantelet E, Sandi C, Márquez C. Programming effects of peripubertal stress on spatial learning. Neurobiol Stress 2020; 13:100282. [PMID: 33344733 PMCID: PMC7739188 DOI: 10.1016/j.ynstr.2020.100282] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/03/2020] [Accepted: 11/25/2020] [Indexed: 01/30/2023] Open
Abstract
Exposure to adversity during early life can have profound influences on brain function and behavior later in life. The peripubertal period is emerging as an important time-window of susceptibility to stress, with substantial evidence documenting long-term consequences in the emotional and social domains. However, little is known about how stress during this period impacts subsequent cognitive functioning. Here, we assessed potential long-term effects of peripubertal stress on spatial learning and memory using the water maze task. In addition, we interrogated whether individual differences in stress-induced behavioral and endocrine changes are related to the degree of adaptation of the corticosterone response to repeated stressor exposure during the peripubertal period. We found that, when tested at adulthood, peripubertally stressed animals displayed a slower learning rate. Strikingly, the level of spatial orientation in the water maze completed on the last training day was predicted by the degree of adaptation of the recovery -and not the peak-of the corticosterone response to stressor exposure (i.e., plasma levels at 60 min post-stressor) across the peripubertal stress period. In addition, peripubertal stress led to changes in emotional and glucocorticoid reactivity to novelty exposure, as well as in the expression levels of the plasticity molecule PSA-NCAM in the hippocampus. Importantly, by assessing the same endpoints in another peripubertally stressed cohort tested during adolescence, we show that the observed effects at adulthood are the result of a delayed programming manifested at adulthood and not protracted effects of stress. Altogether, our results support the view that the degree of stress-induced adaptation of the hypothalamus-pituitary-adrenal axis responsiveness at the important transitional period of puberty relates to the long-term programming of cognition, behavior and endocrine reactivity.
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Affiliation(s)
- S Tzanoulinou
- Laboratory of Behavioral Genetics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - E Gantelet
- Laboratory of Behavioral Genetics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - C Sandi
- Laboratory of Behavioral Genetics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - C Márquez
- Laboratory of Neural Circuits of Social Behavior, Instituto de Neurociencias (Universidad Miguel Hernández-Consejo Superior de Investigaciones Científicas), San Juan de Alicante, Spain
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Shahbazian S, Bokiniec P, Berning BA, McMullan S, Goodchild AK. Polysialic acid in the rat brainstem and thoracolumbar spinal cord: Distribution, cellular location, and comparison with mouse. J Comp Neurol 2020; 529:811-827. [PMID: 32656805 DOI: 10.1002/cne.24982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 06/30/2020] [Indexed: 11/08/2022]
Abstract
Polysialic acid (polySia), a homopolymer of α2,8-linked glycans, is a posttranslational modification on a few glycoproteins, most commonly in the brain, on the neural cell adhesion molecule. Most research in the adult central nervous system has focused on its expression in higher brain regions, where its distribution coincides with regions known to exhibit high levels of synaptic plasticity. In contrast, scant attention has been paid to the expression of polySia in the hindbrain. The main aims of the study were to examine the distribution of polySia immunoreactivity in the brainstem and thoracolumbar spinal cord, to compare the distribution of polySia revealed by two commercial antibodies commonly used for its investigation, and to compare labeling in the rat and mouse. We present a comprehensive atlas of polySia immunoreactivity: we report that polySia labeling is particularly dense in the dorsal tegmentum, medial vestibular nuclei and lateral parabrachial nucleus, and in brainstem regions associated with autonomic function, including the dorsal vagal complex, A5, rostral ventral medulla, A1, and midline raphe, as well as sympathetic preganglionic neurons in the spinal cord and central targets of primary sensory afferents (nucleus of the solitary tract, spinal trigeminal nucleus, and dorsal horn [DH]). Ultrastructural examination showed labeling was present predominantly on the plasma membrane/within the extracellular space/in or on astrocytes. Labeling throughout the brainstem and spinal cord were very similar for the two antibodies and was eliminated by the polySia-specific sialidase, Endo-NF. Similar patterns of distribution were found in rat and mouse brainstem with differences evident in DH.
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Affiliation(s)
- Shila Shahbazian
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Phillip Bokiniec
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia.,Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Britt A Berning
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Simon McMullan
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Ann K Goodchild
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
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Merino JJ, Muñetón-Gomez V, Muñetón-Gómez C, Pérez-Izquierdo MÁ, Loscertales M, Toledano Gasca A. Hippocampal CCR5/RANTES Elevations in a Rodent Model of Post-Traumatic Stress Disorder: Maraviroc (a CCR5 Antagonist) Increases Corticosterone Levels and Enhances Fear Memory Consolidation. Biomolecules 2020; 10:E212. [PMID: 32024104 PMCID: PMC7072246 DOI: 10.3390/biom10020212] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 01/26/2020] [Accepted: 01/27/2020] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Contextual fear conditioning (CFC) is a rodent model that induces a high and long-lasting level of conditioning associated with traumatic memory formation; this behavioral paradigm resembles many characteristics of posttraumatic stress disorder (PSTD). Chemokines (chemotactic cytokines) play a known role in neuronal migration and neurodegeneration but their role in cognition is not totally elucidated. AIM We ascertain whether CCR5/RANTES beta chemokines (hippocampus/prefrontal cortex) could play a role in fear memory consolidation (CFC paradigm). We also evaluated whether chronic stress restraint (21 days of restraint, 6-h/day) could regulate levels of these beta chemokines in CFC-trained rats; fear memory retention was determined taking the level of freezing (context and tone) by the animals as an index of fear memory consolidation 24 h after CFC training session; these chemokines (CCR5/RANTES) and IL-6 levels were measured in the hippocampus and prefrontal cortex of chronically stressed rats, 24 h after CFC post-training, and compared with undisturbed CFC-trained rats (Experiment 1). In Experiment 2, rats received 1 mA of footshock during the CFC training session and fear memory consolidation was evaluated at 12 and 24 h after CFC training sessions. We evaluated whether RANTES levels could be differentially regulated at 12 and 24 h after CFC training; in Experiment 3, maraviroc was administered to rats (i.m: 100 mg/Kg, a CCR5 antagonist) before CFC training. These rats were not subjected to chronic stress restraint. We evaluated whether CCR5 blockade before CFC training could increase corticosterone, RANTES, or IL-6 levels and affects fear memory consolidation in the rats 24-h post-testing compared with vehicle CFC-trained rats. RESULTS Elevations of CCR5/RANTES chemokine levels in the hippocampus could have contributed to fear memory consolidation (24 h post-training) and chronic stress restraint did not affect these chemokines in the hippocampus; there were no significant differences in CCR5/RANTES levels between stressed and control rats in the prefrontal cortex (Experiment 1). In Experiment 2, hippocampal CCR5/RANTES levels increased and enhanced fear memory consolidation was observed 12 and 24 h after CFC training sessions with 1 mA of footshock. Increased corticosterone and CCR5/RANTES levels, as well as a higher freezing percentage to the context, were found at 24 h CFC post-testing in maraviroc-treated rats as compared to vehicle-treated animals (experiment-3). Conversely, IL-6 is not affected by maraviroc treatment in CFC training. CONCLUSION Our findings suggest a role for a hippocampal CCR5/RANTES axis in contextual fear memory consolidation; in fact, RANTES levels increased at 12 and 24 h after CFC training. When CCR5 was blocked by maraviroc before CFC training, RANTES (hippocampus), corticosterone levels, and fear memory consolidation were greater than in vehicle CFC-trained rats 24 h after the CFC session.
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Affiliation(s)
- José Joaquín Merino
- Dpto. Farmacología, Farmacognosia y Botánica, Facultad de Farmacia, Universidad Complutense de Madrid (U.C.M). c/ Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
| | - Vilma Muñetón-Gomez
- Universidad de La Salle Center, Facultad de Ciencias Agropecuarias, Av. Carrera 7. # 179-03 (sede norte), Bogotá, Colombia; (V.M.-G.); (C.M.-G.)
| | - César Muñetón-Gómez
- Universidad de La Salle Center, Facultad de Ciencias Agropecuarias, Av. Carrera 7. # 179-03 (sede norte), Bogotá, Colombia; (V.M.-G.); (C.M.-G.)
| | | | - María Loscertales
- Harvard Medical School, MGH, Massachussets General Hospital, 185 Cambridge St, Boston, MA 02114, USA;
| | - Adolfo Toledano Gasca
- Department of Neuroanatomy, Instituto Cajal (CSIC), c/ Dr. Arce, 28.002 Madrid, Spain;
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Raber J, Arzy S, Bertolus JB, Depue B, Haas HE, Hofmann SG, Kangas M, Kensinger E, Lowry CA, Marusak HA, Minnier J, Mouly AM, Mühlberger A, Norrholm SD, Peltonen K, Pinna G, Rabinak C, Shiban Y, Soreq H, van der Kooij MA, Lowe L, Weingast LT, Yamashita P, Boutros SW. Current understanding of fear learning and memory in humans and animal models and the value of a linguistic approach for analyzing fear learning and memory in humans. Neurosci Biobehav Rev 2019; 105:136-177. [PMID: 30970272 DOI: 10.1016/j.neubiorev.2019.03.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 01/30/2019] [Accepted: 03/18/2019] [Indexed: 01/04/2023]
Abstract
Fear is an emotion that serves as a driving factor in how organisms move through the world. In this review, we discuss the current understandings of the subjective experience of fear and the related biological processes involved in fear learning and memory. We first provide an overview of fear learning and memory in humans and animal models, encompassing the neurocircuitry and molecular mechanisms, the influence of genetic and environmental factors, and how fear learning paradigms have contributed to treatments for fear-related disorders, such as posttraumatic stress disorder. Current treatments as well as novel strategies, such as targeting the perisynaptic environment and use of virtual reality, are addressed. We review research on the subjective experience of fear and the role of autobiographical memory in fear-related disorders. We also discuss the gaps in our understanding of fear learning and memory, and the degree of consensus in the field. Lastly, the development of linguistic tools for assessments and treatment of fear learning and memory disorders is discussed.
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Affiliation(s)
- Jacob Raber
- Department of Behavioral Neuroscience, ONPRC, Oregon Health & Science University, Portland, OR, USA; Departments of Neurology and Radiation Medicine, and Division of Neuroscience, ONPRC, Oregon Health & Science University, Portland, OR, USA.
| | - Shahar Arzy
- Department of Medical Neurobiology, Hebrew University, Jerusalem 91904, Israel
| | | | - Brendan Depue
- Departments of Psychological and Brain Sciences and Anatomical Sciences and Neurobiology, University of Louisville, Louisville, KY, USA
| | - Haley E Haas
- Department of Psychiatry and Behavioral Science, Emory University School of Medicine, Atlanta, GA, USA
| | - Stefan G Hofmann
- Department of Psychological and Brain Sciences, Boston University, Boston, MA, USA
| | - Maria Kangas
- Department of Psychology, Macquarie University, Sydney, Australia
| | | | - Christopher A Lowry
- Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - Hilary A Marusak
- Department of Pharmacy Practice, Wayne State University, Detroit, MI, USA
| | - Jessica Minnier
- School of Public Health, Oregon Health & Science University, Portland, OR, USA
| | - Anne-Marie Mouly
- Lyon Neuroscience Research Center, CNRS-UMR 5292, INSERM U1028, Université Lyon, Lyon, France
| | - Andreas Mühlberger
- Department of Psychology (Clinical Psychology and Psychotherapy), University of Regensburg, Regensburg, Germany; PFH - Private University of Applied Sciences, Department of Psychology (Clinical Psychology and Psychotherapy Research), Göttingen, Germany
| | - Seth Davin Norrholm
- Department of Psychiatry and Behavioral Science, Emory University School of Medicine, Atlanta, GA, USA
| | - Kirsi Peltonen
- Faculty of Social Sciences/Psychology, Tampere University, Tampere, Finland
| | - Graziano Pinna
- The Psychiatric Institute, Department of Psychiatry, University of Illinois at Chicago, Chicago, IL, USA
| | - Christine Rabinak
- Department of Pharmacy Practice, Wayne State University, Detroit, MI, USA
| | - Youssef Shiban
- Department of Psychology (Clinical Psychology and Psychotherapy), University of Regensburg, Regensburg, Germany; PFH - Private University of Applied Sciences, Department of Psychology (Clinical Psychology and Psychotherapy Research), Göttingen, Germany
| | - Hermona Soreq
- Department of Biological Chemistry, Edmond and Lily Safra Center of Brain Science and The Institute of Life Sciences, Hebrew University, Jerusalem 91904, Israel
| | - Michael A van der Kooij
- Translational Psychiatry, Department of Psychiatry and Psychotherapy, Universitatsmedizin der Johannes Guttenberg University Medical Center, Mainz, Germany
| | | | - Leah T Weingast
- Department of Psychiatry and Behavioral Science, Emory University School of Medicine, Atlanta, GA, USA
| | - Paula Yamashita
- School of Public Health, Oregon Health & Science University, Portland, OR, USA
| | - Sydney Weber Boutros
- Department of Behavioral Neuroscience, ONPRC, Oregon Health & Science University, Portland, OR, USA
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Othman H, Ammari M, Sakly M, Abdelmelek H. Effects of repeated restraint stress and WiFi signal exposure on behavior and oxidative stress in rats. Metab Brain Dis 2017; 32:1459-1469. [PMID: 28451780 DOI: 10.1007/s11011-017-0016-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 04/17/2017] [Indexed: 12/14/2022]
Abstract
Today, due to technology development and aversive events of daily life, Human exposure to both radiofrequency and stress is unavoidable. This study investigated the co-exposure to repeated restraint stress and WiFi signal on cognitive function and oxidative stress in brain of male rats. Animals were divided into four groups: Control, WiFi-exposed, restrained and both WiFi-exposed and restrained groups. Each of WiFi exposure and restraint stress occurred 2 h (h)/day during 20 days. Subsequently, various tests were carried out for each group, such as anxiety in elevated plus maze, spatial learning abilities in the water maze, cerebral oxidative stress response and cholinesterase activity in brain and serum. Results showed that WiFi exposure and restraint stress, alone and especially if combined, induced an anxiety-like behavior without impairing spatial learning and memory abilities in rats. At cerebral level, we found an oxidative stress response triggered by WiFi and restraint, per se and especially when combined as well as WiFi-induced increase in acetylcholinesterase activity. Our results reveal that there is an impact of WiFi signal and restraint stress on the brain and cognitive processes especially in elevated plus maze task. In contrast, there are no synergistic effects between WiFi signal and restraint stress on the brain.
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Affiliation(s)
- Haifa Othman
- Faculty of Sciences of Bizerte, Laboratory of Integrative Physiology, University of Carthage, 7021, Jarzouna, Tunisia
| | - Mohamed Ammari
- Faculty of Sciences of Bizerte, Laboratory of Integrative Physiology, University of Carthage, 7021, Jarzouna, Tunisia.
- Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, 9, Rue Zouhair Essafi, 1006, Tunis, Tunisia.
| | - Mohsen Sakly
- Faculty of Sciences of Bizerte, Laboratory of Integrative Physiology, University of Carthage, 7021, Jarzouna, Tunisia
| | - Hafedh Abdelmelek
- Faculty of Sciences of Bizerte, Laboratory of Integrative Physiology, University of Carthage, 7021, Jarzouna, Tunisia
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Serum Markers of Neurodegeneration in Maple Syrup Urine Disease. Mol Neurobiol 2016; 54:5709-5719. [PMID: 27660262 DOI: 10.1007/s12035-016-0116-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 09/09/2016] [Indexed: 12/14/2022]
Abstract
Maple syrup urine disease (MSUD) is an inherited disorder caused by deficient activity of the branched-chain α-keto acid dehydrogenase complex involved in the degradation pathway of branched-chain amino acids (BCAAs) and their respective α-keto-acids. Patients affected by MSUD present severe neurological symptoms and brain abnormalities, whose pathophysiology is poorly known. However, preclinical studies have suggested alterations in markers involved with neurodegeneration. Because there are no studies in the literature that report the neurodegenerative markers in MSUD patients, the present study evaluated neurodegenerative markers (brain-derived neurotrophic factor (BDNF), cathepsin D, neural cell adhesion molecule (NCAM), plasminogen activator inhibitor-1 total (PAI-1 (total)), platelet-derived growth factor AA (PDGF-AA), PDGF-AB/BB) in plasma from 10 MSUD patients during dietary treatment. Our results showed a significant decrease in BDNF and PDGF-AA levels in MSUD patients. On the other hand, NCAM and cathepsin D levels were significantly greater in MSUD patients compared to the control group, while no significant changes were observed in the levels of PAI-1 (total) and PDGF-AB/BB between the control and MSUD groups. Our data show that MSUD patients present alterations in proteins involved in the neurodegenerative process. Thus, the present findings corroborate previous studies that demonstrated that neurotrophic factors and lysosomal proteases may contribute, along with other mechanisms, to the intellectual deficit and neurodegeneration observed in MSUD.
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10
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Mione J, Manrique C, Duhoo Y, Roman FS, Guiraudie-Capraz G. Expression of polysialyltransferases (STX and PST) in adult rat olfactory bulb after an olfactory associative discrimination task. Neurobiol Learn Mem 2016; 130:52-60. [PMID: 26844880 DOI: 10.1016/j.nlm.2016.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 01/11/2016] [Accepted: 01/25/2016] [Indexed: 11/18/2022]
Abstract
Neuronal plasticity and neurogenesis occur in the adult hippocampus and in other brain structures such as the olfactory bulb and often involve the neural cell adhesion molecule NCAM. During an olfactory associative discrimination learning task, NCAM polysialylation triggers neuronal plasticity in the adult hippocampus. The PST enzyme likely modulates this polysialylation, but not STX, a second sialyltransferase. How the two polysialyltransferases are involved in the adult olfactory bulb remains unknown. We addressed this question by investigating the effect of olfactory associative learning on plasticity and neurogenesis. After a hippocampo-dependent olfactory associative task learning, we measured the expression of both PST and STX polysialyltransferases in the olfactory bulbs of adult rats using quantitative PCR. In parallel, immunohistochemistry was used to evaluate both NCAM polysialylation level and newly-born cells, with or without learning. After learning, no changes were observed neither in the expression level of PST and NCAM polysialylation, nor in STX gene expression level and newly-born cells number in the olfactory bulb.
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Affiliation(s)
- J Mione
- Aix Marseille Université, CNRS, NICN, UMR 7259, 13344 Marseille, France
| | - C Manrique
- Aix Marseille Université, CNRS, FR 3512, 13331 Marseille, France
| | - Y Duhoo
- Aix Marseille Université, CNRS, NICN, UMR 7259, 13344 Marseille, France
| | - F S Roman
- Aix Marseille Université, CNRS, NICN, UMR 7259, 13344 Marseille, France
| | - G Guiraudie-Capraz
- Aix Marseille Université, CNRS, NICN, UMR 7259, 13344 Marseille, France.
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11
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Environmental enrichment rescues memory in mice deficient for the polysialytransferase ST8SiaIV. Brain Struct Funct 2015; 221:1591-605. [DOI: 10.1007/s00429-015-0991-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 01/09/2015] [Indexed: 02/06/2023]
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12
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Revest JM, Le Roux A, Roullot-Lacarrière V, Kaouane N, Vallée M, Kasanetz F, Rougé-Pont F, Tronche F, Desmedt A, Piazza PV. BDNF-TrkB signaling through Erk1/2 MAPK phosphorylation mediates the enhancement of fear memory induced by glucocorticoids. Mol Psychiatry 2014; 19:1001-9. [PMID: 24126929 PMCID: PMC4195976 DOI: 10.1038/mp.2013.134] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 08/27/2013] [Accepted: 08/28/2013] [Indexed: 12/25/2022]
Abstract
Activation of glucocorticoid receptors (GR) by glucocorticoid hormones (GC) enhances contextual fear memories through the activation of the Erk1/2(MAPK) signaling pathway. However, the molecular mechanism mediating this effect of GC remains unknown. Here we used complementary molecular and behavioral approaches in mice and rats and in genetically modified mice in which the GR was conditionally deleted (GR(NesCre)). We identified the tPA-BDNF-TrkB signaling pathway as the upstream molecular effectors of GR-mediated phosphorylation of Erk1/2(MAPK) responsible for the enhancement of contextual fear memory. These findings complete our knowledge of the molecular cascade through which GC enhance contextual fear memory and highlight the role of tPA-BDNF-TrkB-Erk1/2(MAPK) signaling pathways as one of the core effectors of stress-related effects of GC.
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Affiliation(s)
- J-M Revest
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France,Pathophysiology of Addiction, Neurocentre Magendie, INSERM-U862, 146 rue Léo Saignat, Bordeaux F-33077, France. E-mail:
| | - A Le Roux
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France
| | - V Roullot-Lacarrière
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France
| | - N Kaouane
- Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France,INSERM U862, Neurocentre Magendie, Pathophysiology of Declarative Memory, Bordeaux, France
| | - M Vallée
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France
| | - F Kasanetz
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France
| | - F Rougé-Pont
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France
| | - F Tronche
- CNRS UMR7224, UPMC Université Pierre et Marie Curie, Molecular Genetics, Neurophysiology and Behavior, Paris, France
| | - A Desmedt
- Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France,INSERM U862, Neurocentre Magendie, Pathophysiology of Declarative Memory, Bordeaux, France
| | - P V Piazza
- INSERM U862, Neurocentre Magendie, Pathophysiology of Addiction, Bordeaux, France,Pathophysiology of Neuronal Plasticity, Université de Bordeaux, Bordeaux, France
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13
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Manrique C, Migliorati M, Gilbert V, Brezun JM, Chaillan FA, Truchet B, Khrestchatisky M, Guiraudie-Capraz G, Roman FS. Dynamic expression of the polysialyltransferase in adult rat hippocampus performing an olfactory associative task. Hippocampus 2014; 24:979-89. [DOI: 10.1002/hipo.22284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 04/07/2014] [Accepted: 04/09/2014] [Indexed: 01/16/2023]
Affiliation(s)
| | | | - Valérie Gilbert
- Aix Marseille Université, CNRS; FR 3512 13331 Marseille France
| | | | | | - Bruno Truchet
- Aix Marseille Université, CNRS; UMR 7291 13331 Marseille France
| | | | | | - François S. Roman
- Aix Marseille Université, CNRS, NICN; UMR 7259 13344 Marseille France
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14
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Pereda-Pérez I, Popović N, Otalora BB, Popović M, Madrid JA, Rol MA, Venero C. Long-term social isolation in the adulthood results in CA1 shrinkage and cognitive impairment. Neurobiol Learn Mem 2013; 106:31-9. [PMID: 23867635 DOI: 10.1016/j.nlm.2013.07.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2013] [Revised: 06/24/2013] [Accepted: 07/04/2013] [Indexed: 12/28/2022]
Abstract
Social isolation in adulthood is a psychosocial stressor that can result in endocrinological and behavioral alterations in different species. In rodents, controversial results have been obtained in fear conditioning after social isolation at adulthood, while neural substrates underlying these differences are largely unknown. Neural cell adhesion molecule (NCAM) and its polysialylated form (PSA-NCAM) are prominent modulators of synaptic plasticity underlying memory processes in many tasks, including fear conditioning. In this study, we used adult female Octodon degus to investigate the effects of long-term social isolation on contextual and cued fear conditioning, and the possible modulation of the synaptic levels of NCAM and PSA-NCAM in the hippocampus. After 6½ months of social isolation, adult female degus showed a normal auditory-cued fear memory, but a deficit in contextual fear memory, a hippocampal dependent task. Subsequently, we observed reduced hippocampal synaptic levels of PSA-NCAM in isolated compared to grouped-housed female degus. No significant differences were found between experimental groups in hippocampal levels of the three main isoforms of NCAM (NCAM180, NCAM140 and NCAM120). Interestingly, social isolation reduced the volume of the hippocampal CA1 subfield, without affecting the volume of the CA3 subregion or the total hippocampus. Moreover, attenuated body weight gain and reduced number of granulocytes were detected in isolated animals. Our findings indicate for the first time, that long-term social isolation of adult female animals induces a specific shrinkage of CA1 and a decrease in synaptic levels of PSA-NCAM in the hippocampus. These effects may be related to the deficit in contextual fear memory observed in isolated female degus.
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Affiliation(s)
- Inmaculada Pereda-Pérez
- Department of Psychobiology, Universidad Nacional de Educación a Distancia, Juan del Rosal 10, 28040 Madrid, Spain
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15
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Molecular signatures and mechanisms of long-lasting memory consolidation and storage. Neurobiol Learn Mem 2013; 106:40-7. [PMID: 23831672 DOI: 10.1016/j.nlm.2013.06.018] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 06/25/2013] [Accepted: 06/26/2013] [Indexed: 12/27/2022]
Abstract
A body of evidence emerged in the last decade regarding late posttraining memory processing. Most of this new information comes from aversively motivated learning tasks that mainly depend on hippocampus, amygdala and insular cortex, and points to the involvement of long-lasting changes in gene expression and protein synthesis in late stages of memory consolidation and storage. Here, we describe recent advances in this field and discuss how recurrent rounds of macromolecular synthesis and its regulation might impact long-term memory storage.
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16
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Fantin M, van der Kooij MA, Grosse J, Krummenacher C, Sandi C. A key role for nectin-1 in the ventral hippocampus in contextual fear memory. PLoS One 2013; 8:e56897. [PMID: 23418609 PMCID: PMC3572046 DOI: 10.1371/journal.pone.0056897] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 01/15/2013] [Indexed: 01/25/2023] Open
Abstract
Nectins are cell adhesion molecules that are widely expressed in the brain. Nectin expression shows a dynamic spatiotemporal regulation, playing a role in neural migratory processes during development. Nectin-1 and nectin-3 and their heterophilic trans-interactions are important for the proper formation of synapses. In the hippocampus, nectin-1 and nectin-3 localize at puncta adherentia junctions and may play a role in synaptic plasticity, a mechanism essential for memory and learning. We evaluated the potential involvement of nectin-1 and nectin-3 in memory consolidation using an emotional learning paradigm. Rats trained for contextual fear conditioning showed transient nectin-1—but not nectin-3—protein upregulation in synapse-enriched hippocampal fractions at about 2 h posttraining. The upregulation of nectin-1 was found exclusively in the ventral hippocampus and was apparent in the synaptoneurosomal fraction. This upregulation was induced by contextual fear conditioning but not by exposure to context or shock alone. When an antibody against nectin-1, R165, was infused in the ventral-hippocampus immediately after training, contextual fear memory was impaired. However, treatment with the antibody in the dorsal hippocampus had no effect in contextual fear memory formation. Similarly, treatment with the antibody in the ventral hippocampus did not interfere with acoustic memory formation. Further control experiments indicated that the effects of ventral hippocampal infusion of the nectin-1 antibody in contextual fear memory cannot be ascribed to memory non-specific effects such as changes in anxiety-like behavior or locomotor behavior. Therefore, we conclude that nectin-1 recruitment to the perisynaptic environment in the ventral hippocampus plays an important role in the formation of contextual fear memories. Our results suggest that these mechanisms could be involved in the connection of emotional and contextual information processed in the amygdala and dorsal hippocampus, respectively, thus opening new venues for the development of treatments to psychopathological alterations linked to impaired contextualization of emotions.
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Affiliation(s)
- Martina Fantin
- Laboratory of Behavioral Genetics, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne EPFL, Lausanne, Switzerland
| | - Michael A. van der Kooij
- Laboratory of Behavioral Genetics, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne EPFL, Lausanne, Switzerland
| | - Jocelyn Grosse
- Laboratory of Behavioral Genetics, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne EPFL, Lausanne, Switzerland
| | - Claude Krummenacher
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Carmen Sandi
- Laboratory of Behavioral Genetics, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne EPFL, Lausanne, Switzerland
- * E-mail:
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17
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18
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Restoration of synaptic plasticity and learning in young and aged NCAM-deficient mice by enhancing neurotransmission mediated by GluN2A-containing NMDA receptors. J Neurosci 2012; 32:2263-75. [PMID: 22396402 DOI: 10.1523/jneurosci.5103-11.2012] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Neural cell adhesion molecule (NCAM) is the predominant carrier of the unusual glycan polysialic acid (PSA). Deficits in PSA and/or NCAM expression cause impairments in hippocampal long-term potentiation and depression (LTP and LTD) and are associated with schizophrenia and aging. In this study, we show that impaired LTP in adult NCAM-deficient (NCAM(-/-)) mice is restored by increasing the activity of the NMDA subtype of glutamate receptor (GluN) through either reducing the extracellular Mg2+ concentration or applying d-cycloserine (DCS), a partial agonist of the GluN glycine binding site. Pharmacological inhibition of the GluN2A subtype reduced LTP to the same level in NCAM(-/-) and wild-type (NCAM(+/+)) littermate mice and abolished the rescue by DCS in NCAM(-/-) mice, suggesting that the effects of DCS are mainly mediated by GluN2A. The insufficient contribution of GluN to LTD in NCAM(-/-) mice was also compensated for by DCS. Furthermore, impaired contextual and cued fear conditioning levels were restored in NCAM(-/-) mice by administration of DCS before conditioning. In 12-month-old NCAM(-/-), but not NCAM(+/+) mice, there was a decline in LTP compared with 3-month-old mice that could be rescued by DCS. In 24-month-old mice of both genotypes, there was a reduction in LTP that could be fully restored by DCS in NCAM(+/+) mice but only partially restored in NCAM(-/-) mice. Thus, several deficiencies of NCAM(-/-) mice can be ameliorated by enhancing GluN2A-mediated neurotransmission with DCS.
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19
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Merino JJ, Largo C, Caz V, Ibarra L, Posadas S, de Miguel E. Growth hormone increases neural cell adhesion polysialylation state in the dentate gyrus of γ-irradiated rats. Synapse 2011; 65:1239-43. [DOI: 10.1002/syn.20945] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Calandreau L, Márquez C, Bisaz R, Fantin M, Sandi C. Differential impact of polysialyltransferase ST8SiaII and ST8SiaIV knockout on social interaction and aggression. GENES BRAIN AND BEHAVIOR 2011; 9:958-67. [PMID: 20659171 DOI: 10.1111/j.1601-183x.2010.00635.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Previous studies using neuronal cell adhesion molecule (NCAM) -/- knockout (KO) mice provided evidence for a role of NCAMs in social behaviors. However, polysialic acid (PSA), the most important post-translational modification of NCAM, was also absent in these mice, which makes it difficult to distinguish between the specific involvement of either PSA or NCAM in social interactions. To address this issue, we assessed two lines of mice deficient for one of the two sialyltransferase enzymes required for the polysialylation of NCAM, sialyltransferase-X (St8SiaII or STX) and polysialyltransferase (ST8SiaIV or PST), in a series of tests for social behaviors. Results showed that PST KO mice display a decreased motivation in social interaction. This deficit can be partly explained by olfactory deficits and was associated with a clear decrease in PSA-NCAM expression in all brain regions analyzed (amygdala, septum, bed nucleus of the stria terminalis and frontal cortices). STX KO mice displayed both a decreased social motivation and an increased aggressive behavior that cannot be explained by olfactory deficits. This finding might be related to the reduced anxiety-like behavior, increased locomotion and stress-induced corticosterone secretion observed in these mice. Moreover, STX KO mice showed mild increase of PSA-NCAM expression in the lateral septum and the orbitofrontal cortex. Altogether, these findings support a role for PSA-NCAM in the regulation of social behaviors ranging from a lack of social motivation to aggression. They also underscore STX KO mice as an interesting animal model that combines a behavioral profile of violence and hyperactivity with reduced anxiety-like behavior.
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Affiliation(s)
- L Calandreau
- Laboratory of Behavioral Genetics, Brain Mind Institute, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland.
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21
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Bisaz R, Schachner M, Sandi C. Causal evidence for the involvement of the neural cell adhesion molecule, NCAM, in chronic stress-induced cognitive impairments. Hippocampus 2010; 21:56-71. [DOI: 10.1002/hipo.20723] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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22
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Role of the neural cell adhesion molecule (NCAM) in amygdalo-hippocampal interactions and salience determination of contextual fear memory. Int J Neuropsychopharmacol 2010; 13:661-74. [PMID: 20003620 DOI: 10.1017/s1461145709991106] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Evidence suggests that the neural cell adhesion molecule (NCAM) is an important molecular constituent of adaptive and maladaptive circuit (re-)organization in the central nervous system. Here, we further investigate its putative involvement in amygdala and hippocampus functions during context fear memory formation. Using laser capture microdissection and quantitative RT-PCR, we show high NCAM mRNA expression levels in the lateral and basolateral subnuclei of the amygdala, as well as their training intensity- and context-dependent regulation during fear memory consolidation. Moreover, we demonstrate that deficits of NCAM-/- mice in context fear memory can be overcome through contextual pre-exposure, i.e. by reducing the modulatory influence of the amygdala on this hippocampus-dependent memory. On the contrary, NCAM-/- mice failed to increase contextual fear memory after salient overtraining, although they adequately increased their response to auditory-cued fear stimuli. Finally, we demonstrate a reduction of amygdalo-hippocampal theta synchronization in NCAM-/- mice during fear memory retrieval. Together, these results suggest an involvement of NCAM-mediated cell recognition processes in information processing of the amygdalo-hippocampal system and in the amygdala-mediated modulation of context fear memory according to stimulus salience.
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23
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Persistence of long-term memory storage: new insights into its molecular signatures in the hippocampus and related structures. Neurotox Res 2010; 18:377-85. [PMID: 20151243 DOI: 10.1007/s12640-010-9155-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 01/19/2010] [Accepted: 01/19/2010] [Indexed: 12/21/2022]
Abstract
Although much is known about long-term memory (LTM) consolidation, what puts the "long" in LTM is the exclusive feature of persisting over time. However, until recently the molecular mechanisms underneath memory persistence had never been properly studied. In rats, the protein translation inhibitor anisomycin impaired memory persistence when injected into the dorsal hippocampus 12 h after inhibitory avoidance (IA) training without affecting memory formation. Here, we also show learning-induced changes in hippocampal c-Fos, Homer 1a, Akt, CamKIIα, and ERK2 levels around 18-24 h after IA training. Thus, memory persistence is associated with a late phase of plasticity-related protein synthesis in the hippocampus.
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24
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Zoladz PR, Woodson JC, Haynes VF, Diamond DM. Activation of a remote (1-year old) emotional memory interferes with the retrieval of a newly formed hippocampus-dependent memory in rats. Stress 2010; 13:36-52. [PMID: 19658031 DOI: 10.3109/10253890902853123] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The persistent intrusion of remote traumatic memories in people with post-traumatic stress disorder (PTSD) may contribute to the impairment of their ongoing hippocampal and prefrontal cortical functioning. In the current work, we have developed a rodent analogue of the intrusive memory phenomenon. We studied the influence of the activation of a remote traumatic memory in rats on their ability to retrieve a newly formed hippocampus-dependent memory. Adult male Sprague-Dawley rats were given inhibitory avoidance (IA) training, and then 24 h or 1, 6 or 12 months later, the same rats were trained to learn, and then remember across a 30-min delay period, the location of a hidden escape platform in the radial-arm water maze (RAWM). When IA-trained rats spent the 30-min delay period in the IA apparatus, they exhibited intact remote (1-year old) memory of the shock experience. More importantly, activation of the rats' memory of the shock experience profoundly impaired their ability to retrieve the newly formed spatial memory of the hidden platform location in the RAWM. Our finding that reactivation of a remote emotional memory exerted an intrusive effect on new spatial memory processing in rats provides a novel approach toward understanding how intrusive memories of traumatic experiences interfere with ongoing cognitive processing in people with PTSD.
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Brennaman LH, Maness PF. NCAM in Neuropsychiatric and Neurodegenerative Disorders. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2010; 663:299-317. [DOI: 10.1007/978-1-4419-1170-4_19] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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26
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Conboy L, Bisaz R, Markram K, Sandi C. Role of NCAM in Emotion and Learning. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2010; 663:271-96. [DOI: 10.1007/978-1-4419-1170-4_18] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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27
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Illing RB, Rosskothen-Kuhl N, Fredrich M, Hildebrandt H, Zeber AC. Imaging the plasticity of the central auditory system on the cellular and molecular level. ACTA ACUST UNITED AC 2009. [DOI: 10.3109/16513860903454583] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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28
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Aisa BÃ, Elizalde N, Tordera R, Lasheras B, Del RÃo J, RamÃrez MJ. Effects of neonatal stress on markers of synaptic plasticity in the hippocampus: Implications for spatial memory. Hippocampus 2009; 19:1222-31. [DOI: 10.1002/hipo.20586] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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McKee AG, Loscher JS, O'Sullivan NC, Chadderton N, Palfi A, Batti L, Sheridan GK, O'Shea S, Moran M, McCabe O, Fernández AB, Pangalos MN, O'Connor JJ, Regan CM, O'Connor WT, Humphries P, Farrar GJ, Murphy KJ. AAV-mediated chronic over-expression of SNAP-25 in adult rat dorsal hippocampus impairs memory-associated synaptic plasticity. J Neurochem 2009; 112:991-1004. [PMID: 20002519 DOI: 10.1111/j.1471-4159.2009.06516.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Long-term memory is formed by alterations in glutamate-dependent excitatory synaptic transmission, which is in turn regulated by synaptosomal protein of 25 kDa (SNAP-25), a key component of the soluble N-ethylmaleimide-sensitive factor attachment protein receptor complex essential for exocytosis of neurotransmitter-filled synaptic vesicles. Both reduced and excessive SNAP-25 activity has been implicated in various disease states that involve cognitive dysfunctions such as attention deficit hyperactivity disorder, schizophrenia and Alzheimer's disease. Here, we over-express SNAP-25 in the adult rat dorsal hippocampus by infusion of a recombinant adeno-associated virus vector, to evaluate the consequence of late adolescent-adult dysfunction of the soluble N-ethylmaleimide-sensitive factor attachment protein receptor protein in the absence of developmental disruption. We report a specific and significant increase in the levels of extracellular glutamate detectable by microdialysis and a reduction in paired-pulse facilitation in the hippocampus. In addition, SNAP-25 over-expression produced cognitive deficits, delaying acquisition of a spatial map in the water maze and impairing contextual fear conditioning, both tasks known to be dorsal hippocampal dependent. The high background transmission state and pre-synaptic dysfunction likely result in interference with requisite synapse selection during spatial and fear memory consolidation. Together these studies provide the first evidence that excess SNAP-25 activity, restricted to the adult period, is sufficient to mediate significant deficits in the memory formation process.
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Affiliation(s)
- Alex G McKee
- Applied Neurotherapeutics Research Group, Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland.
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30
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Foley AG, Prendergast A, Barry C, Scully D, Upton N, Medhurst AD, Regan CM. H3 receptor antagonism enhances NCAM PSA-mediated plasticity and improves memory consolidation in odor discrimination and delayed match-to-position paradigms. Neuropsychopharmacology 2009; 34:2585-600. [PMID: 19657331 DOI: 10.1038/npp.2009.89] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
To further understand the procognitive actions of GSK189254, a histamine H(3) receptor antagonist, we determined its influence on the modulation of hippocampal neural cell adhesion molecule (NCAM) polysialylation (PSA) state, a necessary neuroplastic mechanism for learning and memory consolidation. A 4-day treatment with GSK189254 significantly increased basal expression of dentate polysialylated cells in rats with the maximal effect being observed at 0.03-0.3 mg/kg. At the optimal dose (0.3 mg/kg), GSK189254 enhanced water maze learning and the associated transient increase in NCAM-polysialylated cells. The increase in dentate polysialylated cell frequency induced by GSK189254 was not attributable to enhanced neurogenesis, although it did induce a small, but significant, increase in the survival of these newborn cells. GSK189254 (0.3 mg/kg) was without effect on polysialylated cell frequency in the entorhinal and perirhinal cortex, but significantly increased the diffuse PSA staining observed in the anterior, ventromedial, and dorsomedial aspects of the hypothalamus. Consistent with its ability to enhance the learning-associated, post-training increases in NCAM PSA state, GSK189254 (0.3 mg/kg) reversed the amnesia induced by scopolamine given in the 6-h post-training period after training in an odor discrimination paradigm. Moreover, GSK189254 significantly improved the performance accuracy of a delayed match-to-position paradigm, a task dependent on the prefrontal cortex and degree of cortical arousal, the latter may be related to enhanced NCAM PSA-associated plasticity in the hypothalamus. The procognitive actions of H3 antagonism combined with increased NCAM PSA expression may exert a disease-modifying action in conditions harboring fundamental deficits in NCAM-mediated neuroplasticity, such as schizophrenia and Alzheimer's disease.
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Affiliation(s)
- Andrew G Foley
- Berand Neuropharmacology, NovaUCD, Belfield Innovation Park, University College Dublin, Dublin, Ireland
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31
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Abstract
The rapid growth of infant brains places an exceptionally high demand on the supply of nutrients from the diet, particularly for preterm infants. Sialic acid (Sia) is an essential component of brain gangliosides and the polysialic acid (polySia) chains that modify neural cell adhesion molecules (NCAM). Sia levels are high in human breast milk, predominately as N-acetylneuraminic acid (Neu5Ac). In contrast, infant formulas contain a low level of Sia consisting of both Neu5Ac and N-glycolylneuraminic acid (Neu5Gc). Neu5Gc is implicated in some human inflammatory diseases. Brain gangliosides and polysialylated NCAM play crucial roles in cell-to-cell interactions, neuronal outgrowth, modifying synaptic connectivity, and memory formation. In piglets, a diet rich in Sia increases the level of brain Sia and the expression of two learning-related genes and enhances learning and memory. The purpose of this review is to summarize the evidence showing the importance of dietary Sia as an essential nutrient for brain development and cognition.
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Affiliation(s)
- Bing Wang
- Human Nutrition Unit, School of Molecular and Microbial Biosciences, University of Sydney, Australia and School of Medicine, Xiamen University, P. R. China.
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Downer EJ, Cowley TR, Cox F, Maher FO, Berezin V, Bock E, Lynch MA. A synthetic NCAM-derived mimetic peptide, FGL, exerts anti-inflammatory properties via IGF-1 and interferon-γ modulation. J Neurochem 2009; 109:1516-25. [DOI: 10.1111/j.1471-4159.2009.06076.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Bisaz R, Conboy L, Sandi C. Learning under stress: A role for the neural cell adhesion molecule NCAM. Neurobiol Learn Mem 2009; 91:333-42. [DOI: 10.1016/j.nlm.2008.11.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Revised: 10/19/2008] [Accepted: 11/07/2008] [Indexed: 12/19/2022]
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Conboy L, Foley AG, O'Boyle NM, Lawlor M, Gallagher HC, Murphy KJ, Regan CM. Curcumin-induced degradation of PKC delta is associated with enhanced dentate NCAM PSA expression and spatial learning in adult and aged Wistar rats. Biochem Pharmacol 2008; 77:1254-65. [PMID: 19161989 DOI: 10.1016/j.bcp.2008.12.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Revised: 12/19/2008] [Accepted: 12/19/2008] [Indexed: 01/20/2023]
Abstract
Polysialylation of the neural cell adhesion molecule (NCAM PSA) is necessary for the consolidation processes of hippocampus-based learning. Previously, we have found inhibition of protein kinase C delta (PKCdelta) to be associated with increased polysialyltransferase (PST) activity, suggesting inhibitors of this kinase might ameliorate cognitive deficits. Using a rottlerin template, a drug previously considered an inhibitor of PKCdelta, we searched the Compounds Available for Purchase (CAP) database with the Accelrys((R)) Catalyst programme for structurally similar molecules and, using the available crystal structure of the phorbol-binding domain of PKCdelta, found that diferuloylmethane (curcumin) docked effectively into the phorbol site. Curcumin increased NCAM PSA expression in cultured neuro-2A neuroblastoma cells and this was inversely related to PKCdelta protein expression. Curcumin did not directly inhibit PKCdelta activity but formed a tight complex with the enzyme. With increasing doses of curcumin, the Tyr(131) residue of PKCdelta, which is known to direct its degradation, became progressively phosphorylated and this was associated with numerous Tyr(131)-phospho-PKCdelta fragments. Chronic administration of curcumin in vivo also increased the frequency of polysialylated cells in the dentate infragranular zone and significantly improved the acquisition and consolidation of a water maze spatial learning paradigm in both adult and aged cohorts of Wistar rats. These results further confirm the role of PKCdelta in regulating PST and NCAM PSA expression and provide evidence that drug modulation of this system enhances the process of memory consolidation.
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Affiliation(s)
- Lisa Conboy
- UCD Conway Institute, University College Dublin, Belfield, Ireland
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Seymour C, Foley A, Murphy K, Regan C. Intraventricular infusions of anti–NCAM PSA impair the process of consolidation of both avoidance conditioning and spatial learning paradigms in Wistar rats. Neuroscience 2008; 157:813-20. [DOI: 10.1016/j.neuroscience.2008.09.041] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2008] [Revised: 09/22/2008] [Accepted: 09/23/2008] [Indexed: 10/21/2022]
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Quartu M, Serra MP, Boi M, Ibba V, Melis T, Del Fiacco M. Polysialylated-neural cell adhesion molecule (PSA-NCAM) in the human trigeminal ganglion and brainstem at prenatal and adult ages. BMC Neurosci 2008; 9:108. [PMID: 18990213 PMCID: PMC2612005 DOI: 10.1186/1471-2202-9-108] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Accepted: 11/06/2008] [Indexed: 12/15/2022] Open
Abstract
Background The polysialylated neuronal cell adhesion molecule (PSA-NCAM) is considered a marker of developing and migrating neurons and of synaptogenesis in the immature vertebrate nervous system. However, it persists in the mature normal brain in some regions which retain a capability for morphofunctional reorganization throughout life. With the aim of providing information relevant to the potential for dynamic changes of specific neuronal populations in man, this study analyses the immunohistochemical occurrence of PSA-NCAM in the human trigeminal ganglion (TG) and brainstem neuronal populations at prenatal and adult age. Results Western blot analysis in human and rat hippocampus supports the specificity of the anti-PSA-NCAM antibody and the immunodetectability of the molecule in postmortem tissue. Immunohistochemical staining for PSA-NCAM occurs in TG and several brainstem regions during prenatal life and in adulthood. As a general rule, it appears as a surface staining suggestive of membrane labelling on neuronal perikarya and proximal processes, and as filamentous and dot-like elements in the neuropil. In the TG, PSA-NCAM is localized to neuronal perikarya, nerve fibres, pericellular networks, and satellite and Schwann cells; further, cytoplasmic perikaryal staining and positive pericellular fibre networks are detectable with higher frequency in adult than in newborn tissue. In the adult tissue, positive neurons are mostly small- and medium-sized, and amount to about 6% of the total ganglionic population. In the brainstem, PSA-NCAM is mainly distributed at the level of the medulla oblongata and pons and appears scarce in the mesencephalon. Immunoreactivity also occurs in discretely localized glial structures. At all ages examined, PSA-NCAM occurs in the spinal trigeminal nucleus, solitary nuclear complex, vestibular and cochlear nuclei, reticular formation nuclei, and most of the precerebellar nuclei. In specimens of different age, the distribution pattern remains fairly steady, whereas the density of immunoreactive structures and the staining intensity may change and are usually higher in newborn than in adult specimens. Conclusion The results obtained show that, in man, the expression of PSA-NCAM in selective populations of central and peripheral neurons occurs not only during prenatal life, but also in adulthood. They support the concept of an involvement of this molecule in the structural and functional neural plasticity throughout life. In particular, the localization of PSA-NCAM in TG primary sensory neurons likely to be involved in the transmission of protopathic stimuli suggests the possible participation of this molecule in the processing of the relevant sensory neurotransmission.
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Affiliation(s)
- Marina Quartu
- Department of Cytomorphology, University of Cagliari, Cittadella Universitaria di Monserrato, Monserrato (Cagliari), Italy.
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Ter Horst JPF, Loscher JS, Pickering M, Regan CM, Murphy KJ. Learning-associated regulation of polysialylated neural cell adhesion molecule expression in the rat prefrontal cortex is region-, cell type- and paradigm-specific. Eur J Neurosci 2008; 28:419-27. [PMID: 18702715 DOI: 10.1111/j.1460-9568.2008.06326.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The prefrontal cortex (PFC) is an interconnected set of cortical areas that function in the synthesis of a diverse range of information and production of complex behaviour. It is now clear that these frontal structures, through bidirectional excitatory communication with the hippocampal formation, also play a substantial role in long-term memory consolidation. In the hippocampus, morphological synaptic plasticity, supported by regulation of neural cell adhesion molecule (NCAM) polysialylation status, is crucial to information storage. The recent description of polysialylated neurons in the various fields of the medial PFC suggests these structures to possess a similar capacity for synaptic plasticity. Here, using double-labelling immunohistochemistry with glutamic acid decarboxylase 67, we report that the nature of NCAM polysialic acid-positive neurons in the PFC is region-specific, with a high proportion (30-50%) of a gamma-aminobutyric acid (GABA)ergic phenotype in the more ventral infralimbic, orbitofrontal and insular cortices compared with just 10% in the dorsal structures of the cingulate, prelimbic and frontal cortices. Moreover, spatial learning was accompanied by activations in polysialylation expression in ventral PFC structures, while avoidance conditioning involved downregulation of this plasticity marker that was restricted to the dorsomedial PFC--the cingulate and prelimbic cortices. Thus, in contrast to other structures integrated functionally with the hippocampus, memory-associated plasticity mobilized in the PFC is region-, cell type- and task-specific.
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Affiliation(s)
- Judith P F Ter Horst
- Applied Neurotherapeutics Research Group, UCD School of Biomolecular and Biomedical Science, Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
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Tsoory M, Guterman A, Richter-Levin G. Exposure to stressors during juvenility disrupts development-related alterations in the PSA-NCAM to NCAM expression ratio: potential relevance for mood and anxiety disorders. Neuropsychopharmacology 2008; 33:378-93. [PMID: 17429411 DOI: 10.1038/sj.npp.1301397] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Childhood trauma is associated with higher rates of both mood and anxiety disorders in adulthood. The exposure of rats to stressors during juvenility has comparable effects, and was suggested as a model of induced predisposition for these disorders. The neural cell adhesion molecule (NCAM) and its polysialylated form PSA-NCAM are critically involved in neural development, activity-dependent synaptic plasticity, and learning processes. We examined the effects of exposure to stressors during juvenility on coping with stressors in adulthood and on NCAM and PSA-NCAM expression within the rat limbic system both soon after the exposure and in adulthood. Exposure to stressors during juvenility reduced novel-setting exploration and impaired two-way shuttle avoidance learning in adulthood. Among naive rats, a development-related decrease of about 50% was evident in the PSA-NCAM to NCAM expression ratio in the basolateral amygdala, in the CA1 and dentate gyrus regions of the hippocampus, and in the entorhinal cortex. In juvenile-stressed rats, we found no such decrease, but rather an increase in the polysialylation of NCAM ( approximately 50%), evident soon after the exposure to juvenile stress and also in adulthood. Our results suggest that exposure to stressors during juvenility alters the maturation of the limbic system, and potentially underlies the predisposition to exhibit stress-related symptoms in adulthood.
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Affiliation(s)
- Michael Tsoory
- Department of Psychology, The Brain and Behavior Research Center, University of Haifa, Mount Carmel, Haifa, Israel
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Gascon E, Vutskits L, Kiss JZ. Polysialic acid–neural cell adhesion molecule in brain plasticity: From synapses to integration of new neurons. ACTA ACUST UNITED AC 2007; 56:101-18. [PMID: 17658613 DOI: 10.1016/j.brainresrev.2007.05.014] [Citation(s) in RCA: 191] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2007] [Revised: 04/02/2007] [Accepted: 05/24/2007] [Indexed: 11/15/2022]
Abstract
Isoforms of the neuronal cell adhesion molecule (NCAM) carrying the linear homopolymer of alpha 2,8-linked sialic acid (polysialic acid, PSA) have emerged as particularly attractive candidates for promoting plasticity in the nervous system. The large negatively charged PSA chain of NCAM is postulated to be a spacer that reduces adhesion forces between cells allowing dynamic changes in membrane contacts. Accumulating evidence also suggests that PSA-NCAM-mediated interactions lead to activation of intracellular signaling cascades that are fundamental to the biological functions of the molecule. An important role of PSA-NCAM appears to be during development, when its expression level is high and where it contributes to the regulation of cell shape, growth or migration. However, PSA-NCAM does persist in adult brain structures such as the hippocampus that display a high degree of plasticity where it is involved in activity-induced synaptic plasticity. Recent advances in the field of PSA-NCAM research have not only consolidated the importance of this molecule in plasticity processes but also suggest a role for PSA-NCAM in the regulation of higher cognitive functions and psychiatric disorders. In this review, we discuss the role and mode of actions of PSA-NCAM in structural plasticity as well as its potential link to cognitive processes.
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Affiliation(s)
- Eduardo Gascon
- Department of Neuroscience, University of Geneva Medical School, 1, Rue Michel Servet, CH-1211, Geneva, Switzerland
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40
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Conboy L, Seymour CM, Monopoli MP, O'Sullivan NC, Murphy KJ, Regan CM. Notch signalling becomes transiently attenuated during long-term memory consolidation in adult Wistar rats. Neurobiol Learn Mem 2007; 88:342-51. [PMID: 17543552 DOI: 10.1016/j.nlm.2007.04.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Revised: 03/30/2007] [Accepted: 04/13/2007] [Indexed: 12/30/2022]
Abstract
Recent evidence has suggested a role for Notch in memory consolidation but the means by which this evolutionarily conserved mechanism serves these plasticity-related processes remains to be established. We have examined a role for this signalling pathway in the hippocampal dentate gyrus of Wistar rats at increasing times following passive avoidance conditioning. Our principal finding is that a transient attenuation of Notch signalling occurs at the 10-12h post-training time. In this period, extracellular Notch-1 protein fragment exhibited a significant 2- to 3-fold increase but, by contrast, Notch-1 mRNA levels were significantly reduced. Moreover, transient inactivation of Notch-1 signalling was further suggested by concomitant reductions in the Notch ligand Jagged-1 and Notch-1 target protein Hes-1 mRNA levels. The C-terminal fragment of PS-1, necessary for gamma-secretase activity, was also significantly reduced at the 12h post-training time. These events were commensurate with the increase of a Notch immunoreactive fragment of 66 kDa in the nuclear fraction of the dentate gyrus. This fragment, identified with two different Notch-1 antisera, was not the expected NICD polypeptide of approximately 110 kDa and its accumulation was found to correlate with a significantly reduced expression of the Hes-1 transcriptional repressor. During the period of reduced Notch activity, a transient increase in soluble beta-catenin and GSK-3beta phosphorylation was observed, indicating a reciprocal activation of the Wnt signalling pathway. As down-regulation of Notch signalling promotes differentiation and neurite outgrowth in post-mitotic neurons, it is proposed that this pathway regulates the integration of synapses transiently produced during memory consolidation.
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Affiliation(s)
- Lisa Conboy
- School of Biomolecular and Biomedical Sciences, UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
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41
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42
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Lopez-Fernandez MA, Montaron MF, Varea E, Rougon G, Venero C, Abrous DN, Sandi C. Upregulation of polysialylated neural cell adhesion molecule in the dorsal hippocampus after contextual fear conditioning is involved in long-term memory formation. J Neurosci 2007; 27:4552-61. [PMID: 17460068 PMCID: PMC6673006 DOI: 10.1523/jneurosci.0396-07.2007] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The role of the hippocampus in pavlovian fear conditioning is controversial. Although lesion and pharmacological inactivation studies have suggested a key role for the dorsal hippocampus in contextual fear conditioning, the involvement of the ventral part is still uncertain. Likewise, the debate is open with regard to the putative implication of each hippocampal subdivision in fear conditioning to a discrete conditioned stimulus. We explored the potential existence of dissociations occurring in the dorsal versus ventral hippocampus at the cellular level while dealing with either contextual or cued fear conditioning and focused in a molecular "signature" linked to structural plasticity, the polysialylated form of the neural cell adhesion molecule (PSA-NCAM). We found an upregulation of PSA-NCAM expression in the dorsal (but not ventral) dentate gyrus at 24 h after contextual (but not tone) fear conditioning. Specific removal of PSA through microinfusion of the enzyme endoneuraminidase-N in the dorsal (but not ventral) hippocampus reduced freezing responses to the conditioned context. Therefore, we present evidence for a specific role of PSA-NCAM in the dorsal hippocampus in the plasticity processes occurring during consolidation of the context representation after "standard" contextual fear conditioning. Interestingly, we also found that exposing animals just to the context induced an activation of PSA-NCAM in both dorsal and ventral dentate gyrus. Altogether, these findings highlighting the distinctive occurrence of these neuroplastic processes in the dorsal hippocampus during the standard contextual fear-conditioning task enlighten the ongoing debate about the involvement of these hippocampal subdivisions in pavlovian fear conditioning.
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Affiliation(s)
| | - Marie-Françoise Montaron
- Neurogenesis and Pathophysiology Laboratory, Bordeaux Neuroscience Research Center, Institut National de la Santé et de la Recherche Médicale 862 and University of Bordeaux 2, Bordeaux Cedex 33077, France
| | - Emilio Varea
- Brain Mind Institute, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland
| | - Genevieve Rougon
- Centre National de la Recherche Scientifique Unité Mixte de Recherche 6216, Université de la Méditerranée, Institut de Biologie du Développement de Marseille-Luminy Case 907, Marseille Cedex 13288, France
| | - Cesar Venero
- Psychobiology Department, Universidad Nacional de Educacion a Distancia, 28040 Madrid, Spain, and
| | - Djoher Nora Abrous
- Neurogenesis and Pathophysiology Laboratory, Bordeaux Neuroscience Research Center, Institut National de la Santé et de la Recherche Médicale 862 and University of Bordeaux 2, Bordeaux Cedex 33077, France
| | - Carmen Sandi
- Brain Mind Institute, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland
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43
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Maćkowiak M, Chocyk A, Markowicz-Kula K, Wędzony K. Acute activation of CB1 cannabinoid receptors transiently decreases PSA-NCAM expression in the dentate gyrus of the rat hippocampus. Brain Res 2007; 1148:43-52. [DOI: 10.1016/j.brainres.2007.02.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 02/02/2007] [Accepted: 02/08/2007] [Indexed: 12/13/2022]
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Duveau V, Arthaud S, Rougier A, Le Gal La Salle G. Polysialylation of NCAM is upregulated by hyperthermia and participates in heat shock preconditioning-induced neuroprotection. Neurobiol Dis 2007; 26:385-95. [PMID: 17336079 DOI: 10.1016/j.nbd.2007.01.007] [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: 06/28/2006] [Revised: 01/16/2007] [Accepted: 01/22/2007] [Indexed: 11/23/2022] Open
Abstract
"Brain tolerance"--a phenomenon in which a subtoxic challenge confers resistance to subsequent brain injuries--provides an ideal opportunity for investigating endogenous neuroprotective mechanisms. We investigated the potential role of the polysialylated (PSA) form of neural cell adhesion molecule (NCAM), which is thought to play a key role in plasticity. In a model where prior exposure to heat shock protects against kainate-induced cell damage in the hippocampus, we show that hyperthermia upregulates PSA-NCAM expression for at least 1 week, without affecting neurogenesis. Pharmacological manipulation of heat shock protein (HSP) expression demonstrates a tight positive link between HSP70 and PSA-NCAM. Finally, the presence of PSA was functionally linked to brain tolerance, as protection against kainate-induced cell death by heat shock pre-exposure was abolished in the absence of NCAM polysialylation. The upregulation of PSA-NCAM by hyperthermia may have a significant impact on hippocampal plasticity, permitting induction of the complex molecular cascade responsible for neuroprotection.
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Affiliation(s)
- V Duveau
- Université Bordeaux 2, CNRS UMR 5227-Mouvement, Adaptation, Cognition, 146, rue Léo Saignat, 33076 Bordeaux Cedex, France
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Markram K, Gerardy-Schahn R, Sandi C. Selective learning and memory impairments in mice deficient for polysialylated NCAM in adulthood. Neuroscience 2007; 144:788-96. [PMID: 17140740 DOI: 10.1016/j.neuroscience.2006.10.024] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2006] [Revised: 09/08/2006] [Accepted: 10/09/2006] [Indexed: 11/17/2022]
Abstract
The neural cell adhesion molecule (NCAM) has been implicated in regulating synaptic plasticity mechanisms as well as memory consolidation processes. Attachment of polysialic acid to NCAM (PSA-NCAM) has been reported to down-regulate its adhesive forces, a process hypothesized to be implicated in synapse selection after learning experiences. PSA-NCAM has been critically implicated in hippocampus-related synaptic plasticity and memory storage, but information about its functional role in other brain areas remains scarce. Here, we studied mice deficient for polysialyltransferase-1 (ST8SialV/PST-1), an enzyme which attaches PSA to NCAM during postnatal development and adulthood, and whose deficiency results in a drastic reduction of PSA-NCAM expression throughout the brain in adulthood. Mice were tested for their performance in the water maze and auditory fear conditioning (AFC). We report that ST8SiaIV knockout mice were impaired in spatial as well as reversal learning in the water maze. On the other hand, AFC was intact and ST8SiaIV mice exhibited no impairments in the acquisition or retention of cued fear memories. Spatial orientation learning and reversal learning require complex integration of spatial information and response selection involving the hippocampus and prefrontal cortex, whereas cued fear conditioning is an associative type of emotional memory that highly depends on amygdala function. Therefore, our results indicate that PSA-NCAM contributes differentially to learning processes that differ in the nature of the neural computations involved, which probably reflects a differential role of this molecule in different brain regions.
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Affiliation(s)
- K Markram
- Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne, Station 15, CH-1015 Lausanne, Switzerland
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46
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Senkov O, Sun M, Weinhold B, Gerardy-Schahn R, Schachner M, Dityatev A. Polysialylated neural cell adhesion molecule is involved in induction of long-term potentiation and memory acquisition and consolidation in a fear-conditioning paradigm. J Neurosci 2006; 26:10888-109898. [PMID: 17050727 PMCID: PMC6674738 DOI: 10.1523/jneurosci.0878-06.2006] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Polysialic acid (PSA) regulates functions of the neural cell adhesion molecule (NCAM) during development and in neuroplasticity in the adult; the underlying mechanisms at different phases of learning and memory consolidation are, however, unknown. To investigate the contributions of PSA versus the extracellular domain of the NCAM glycoprotein backbone to synaptic plasticity, we applied NCAM, PSA-NCAM, and PSA to acute slices of the hippocampal CA1 region of NCAM-deficient mice and measured their effects on long-term potentiation (LTP). Remarkably, only PSA and PSA-NCAM, but not NCAM restored normal LTP. Application of these molecules to the dorsal hippocampus of wild-type mice showed that PSA-NCAM and PSA, but not NCAM, injected before fear conditioning, impaired formation of hippocampus-dependent contextual memory. Consolidation of contextual memory was affected by PSA-NCAM only when injected during its late, but not early phases. None of the tested compounds disturbed extrahippocampal-cued memory. Mice lacking the polysialyltransferase (ST8SialV/PST) responsible for attachment of PSA to NCAM in adulthood showed a mild deficit only in hippocampal contextual learning, when compared with NCAM-deficient mice that were disturbed in both contextual and cued memories. Contextual and tone memory in NCAM-deficient mice could be partially restored by injection of PSA-NCAM, but not of NCAM, into the hippocampus, suggesting that the impact of PSA-NCAM in synaptic plasticity and learning is not mediated by modulation of NCAM-NCAM homophilic interactions. In conclusion, our data support the view that polysialylated NCAM is involved in both formation and late consolidation of contextual memory.
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Affiliation(s)
- Oleg Senkov
- Center for Molecular Neurobiology and
- Institute for Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Mu Sun
- Center for Molecular Neurobiology and
- Department of Physiology, School of Medicine, Jilin University, 130021 Changchun, China, and
| | - Birgit Weinhold
- Department of Cellular Chemistry, Hannover Medical School, D-30625 Hannover, Germany
| | - Rita Gerardy-Schahn
- Department of Cellular Chemistry, Hannover Medical School, D-30625 Hannover, Germany
| | | | - Alexander Dityatev
- Center for Molecular Neurobiology and
- Institute for Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
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Bennur S, Shankaranarayana Rao BS, Pawlak R, Strickland S, McEwen BS, Chattarji S. Stress-induced spine loss in the medial amygdala is mediated by tissue-plasminogen activator. Neuroscience 2006; 144:8-16. [PMID: 17049177 DOI: 10.1016/j.neuroscience.2006.08.075] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2005] [Revised: 08/29/2006] [Accepted: 08/29/2006] [Indexed: 10/24/2022]
Abstract
The amygdala, which exerts a regulatory influence on the stress response, is itself affected by stress. It has been reported that the serine protease tissue-plasminogen activator (tPA), a key mediator of spine plasticity, is required for stress-induced facilitation of anxiety-like behavior. Importantly, tPA is also involved in stress-induced activation of molecular signals that have the potential to contribute to neuronal remodeling in the medial amygdala (MeA). However, little is known about the precise nature of, and specific role played by tPA in, stress-induced structural plasticity in the MeA. Hence, we compared the impact of chronic restraint stress on spine density of medium spiny stellate neurons in MeA in wild-type mice with mice in which the tPA gene is disrupted (tPA-/-). In wild-type mice, chronic stress caused significant reduction in MeA spine density, which was in contrast to enhanced spine density in the neighboring basolateral amygdala (BLA). Strikingly, tPA-/- mice exhibited significant attenuation of stress-induced spine retraction in the MeA, but BLA spinogenesis was not affected. Therefore, tPA-dependence of stress-induced modulation in spine density was restricted to the MeA. Further, MeA neurons in tPA-/- mice, even when challenged with repeated stress, were able to maintain levels of spine density that were comparable to that of wild-type mice without stress. Our findings provide novel evidence for a permissive role for tPA in amygdalar spine plasticity elicited by behavioral stress.
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Affiliation(s)
- S Bennur
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bangalore 560065, India
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Bonfanti L. PSA-NCAM in mammalian structural plasticity and neurogenesis. Prog Neurobiol 2006; 80:129-64. [PMID: 17029752 DOI: 10.1016/j.pneurobio.2006.08.003] [Citation(s) in RCA: 336] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2006] [Revised: 08/04/2006] [Accepted: 08/21/2006] [Indexed: 12/14/2022]
Abstract
Polysialic acid (PSA) is a linear homopolymer of alpha2-8-N acetylneuraminic acid whose major carrier in vertebrates is the neural cell adhesion molecule (NCAM). PSA serves as a potent negative regulator of cell interactions via its unusual biophysical properties. PSA on NCAM is developmentally regulated thus playing a prominent role in different forms of neural plasticity spanning from embryonic to adult nervous system, including axonal growth, outgrowth and fasciculation, cell migration, synaptic plasticity, activity-induced plasticity, neuronal-glial plasticity, embryonic and adult neurogenesis. The cellular distribution, developmental changes and possible function(s) of PSA-NCAM in the central nervous system of mammals here are reviewed, along with recent findings and theories about the relationships between NCAM protein and PSA as well as the role of different polysialyltransferases. Particular attention is focused on postnatal/adult neurogenesis, an issue which has been deeply investigated in the last decade as an example of persisting structural plasticity with potential implications for brain repair strategies. Adult neurogenic sites, although harbouring all subsequent steps of cell differentiation, from stem cell division to cell replacement, do not faithfully recapitulate development. After birth, they undergo morphological and molecular modifications allowing structural plasticity to adapt to the non-permissive environment of the mature nervous tissue, that are paralled by changes in the expression of PSA-NCAM. The use of PSA-NCAM as a marker for exploring differences in structural plasticity and neurogenesis among mammalian species is also discussed.
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Affiliation(s)
- Luca Bonfanti
- Department of Veterinary Morphophysiology, University of Turin, Via Leonardo da Vinci 44, 10095 Grugliasco, Italy.
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Plappert CF, Schachner M, Pilz PKD. Neural cell adhesion molecule (NCAM-/-) null mice show impaired sensitization of the startle response. GENES BRAIN AND BEHAVIOR 2006; 5:46-52. [PMID: 16436188 DOI: 10.1111/j.1601-183x.2005.00132.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The neural cell adhesion molecule (NCAM) plays important roles in development of the nervous system and in synaptic plasticity and memory formation in the adult. The present study sought to further investigate the role of NCAM in learning by testing habituation and footshock sensitization learning of the startle response (SR) in NCAM null mutant (NCAM-/-) and wildtype littermate (NCAM+/+) mice. Whereas habituation is a form of non-associative learning, footshock sensitization is induced by rapid contextual fear conditioning. Habituation was tested by repetitive presentation of acoustic and tactile startle stimuli. Although NCAM-/- mice showed differences in sensitivity in both stimulus modalities, habituation learning was intact in NCAM-/- mice, suggesting that NCAM does not play a role in the mechanisms underlying synaptic plasticity in the startle pathway. Footshock sensitization was elicited by presentation of electric footshocks between two series of acoustic stimuli. In contrast to habituation, footshock sensitization learning was attenuated in NCAM-/- mice: the acoustic SR increase after the footshocks was lower in the mutant than in wildtype mice, indicating that NCAM plays an important role in the relevant brain areas, such as amygdala and/or the hippocampus.
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Affiliation(s)
- C F Plappert
- Universität Tübingen, Zoologisches Institut, Tübingen, Germany.
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Florian C, Foltz J, Norreel JC, Rougon G, Roullet P. Post-training intrahippocampal injection of synthetic poly-alpha-2,8-sialic acid-neural cell adhesion molecule mimetic peptide improves spatial long-term performance in mice. Learn Mem 2006; 13:335-41. [PMID: 16705136 PMCID: PMC1475815 DOI: 10.1101/lm.187506] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2005] [Accepted: 02/07/2006] [Indexed: 11/25/2022]
Abstract
Several data have shown that the neural cell adhesion molecule (NCAM) is necessary for long-term memory formation and might play a role in the structural reorganization of synapses. The NCAM, encoded by a single gene, is represented by several isoforms that differ with regard to their content of alpha-2,8-linked sialic acid residues (PSA) on their extracellular domain. The carbohydrate PSA is known to promote plasticity, and PSA-NCAM isoforms remain expressed in the CA3 region of the adult hippocampus. In the present study, we investigated the effect on spatial memory consolidation of a PSA gain of function by injecting a PSA mimetic peptide (termed pr2) into the dorsal hippocampus. Mice were subjected to massed training in the spatial version of the water maze. Five hours after the last training session, experimental mice received an injection of pr2, whereas control mice received PBS or reverse peptide injections in the hippocampal CA3 region. Memory retention was tested at different time intervals: 24 h, 1 wk, and 4 wk. The results showed that the post-training infusion of pr2 peptide significantly increases spatial performance whenever it was assessed after the training phase. By contrast, administration of the control reverse peptide did not affect retention performance. These findings provide evidence that (1) PSA-NCAM is involved in memory consolidation processes in the CA3 hippocampal region, and (2) PSA mimetic peptides can facilitate the formation of long-term spatial memory when injected during the memory consolidation phase.
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Affiliation(s)
- Cédrick Florian
- Centre de Recherches sur la Cognition Animale, CNRS 5169, Université Paul Sabatier, 31062 Toulouse, France
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