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Alsikhan RS, Aldubayan MA, Almami IS, Alhowail AH. Protective Effect of Galantamine against Doxorubicin-Induced Neurotoxicity. Brain Sci 2023; 13:971. [PMID: 37371449 DOI: 10.3390/brainsci13060971] [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: 05/22/2023] [Revised: 06/16/2023] [Accepted: 06/19/2023] [Indexed: 06/29/2023] Open
Abstract
BACKGROUND AND AIMS Doxorubicin (DOX) causes cognitive impairment (chemobrain) in patients with cancer. While DOX damages the cholinergic system, few studies have focused on the protective effects of cholinergic function on chemobrain. The acetylcholinesterase inhibitor galantamine (GAL) demonstrates neuroprotective properties. We investigated the mechanisms associated with DOX-induced cognitive impairments and the potential protective role of GAL in preventing chemobrain. MAIN METHODS Female Wistar rats were divided into control, DOX, GAL, and DOX + GAL groups. The rats in the DOX group were administered DOX (5 mg/kg intraperitoneally twice weekly for two weeks), while those in the GAL group were orally administered GAL (2.5 mg/kg) via oral gavage once daily for 15 days. The combination group (DOX + GAL) received GAL (once daily) and DOX (two times per week) concurrently. The body weights and survival rates were monitored daily. The animals were subjected to behavioral tests to assess the memory function followed by the biochemical estimation of inflammatory markers, including tumor necrosis factor-α (TNF-α), interleukine-1β (IL-1β), and interleukine-6 (IL-6) in rat brain tissue and RT-qPCR. KEY FINDINGS DOX caused a reduction in the body weight and survival rate, which was alleviated by GAL concomitant treatment with DOX (DOX + GAL). These groups had reduced body weights and survival rates. DOX-treated animals exhibited an impairment of short-term spatial working memory, manifested as a behavioral alteration in the Y-maze test, the novel object recognition (NOR) test, and the elevated plus-maze (EPM) test. Concurrent treatment with GAL (DOX + GAL) showed improved memory function, as evidenced by an increase in the number of entries and time spent in the novel arm, the time spent exploring the novel object, and the transfer latency in the Y-maze, NOR test, and EPM test, respectively. These findings were also supported by biochemical observations showing the reversal of DOX-induced changes in IL-1β, IL-6, and TNF-α, as well as their relative expression of mRNA in brain tissue following concurrent GAL treatment. CONCLUSION GAL appeared to be a neuroprotective agent against neuroinflammation caused by DOX by reducing inflammatory markers in the brain.
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Affiliation(s)
- Rawan S Alsikhan
- Department of Pharmacology and Toxicology, College of Pharmacy, Qassim University, Buraydah 51452, Saudi Arabia
- Department of Pharmacology and Toxicology, Unaizah College of Pharmacy, Qassim University, Unaizah 51911, Saudi Arabia
| | - Maha A Aldubayan
- Department of Pharmacology and Toxicology, College of Pharmacy, Qassim University, Buraydah 51452, Saudi Arabia
| | - Ibtesam S Almami
- Department of Biology, College of Science, Qassim University, Buraydah 51452, Saudi Arabia
| | - Ahmad H Alhowail
- Department of Pharmacology and Toxicology, College of Pharmacy, Qassim University, Buraydah 51452, Saudi Arabia
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Brown JL, Hart DW, Boyle GE, Brown TG, LaCroix M, Baraibar AM, Pelzel R, Kim M, Sherman MA, Boes S, Sung M, Cole T, Lee MK, Araque A, Lesné SE. SNCA genetic lowering reveals differential cognitive function of alpha-synuclein dependent on sex. Acta Neuropathol Commun 2022; 10:180. [PMID: 36517890 PMCID: PMC9749314 DOI: 10.1186/s40478-022-01480-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 11/18/2022] [Indexed: 12/15/2022] Open
Abstract
Antisense oligonucleotide (ASO) therapy for neurological disease has been successful in clinical settings and its potential has generated hope for Alzheimer's disease (AD). We previously described that ablating SNCA encoding for α-synuclein (αSyn) in a mouse model of AD was beneficial. Here, we sought to demonstrate whether transient reduction of αSyn expression using ASOSNCA could be therapeutic in a mouse model of AD. The efficacy of the ASOSNCA was measured via immunocytochemistry, RT-qPCR and western blotting. To assess spatial learning and memory, ASOSNCA or PBS-injected APP and non-transgenic (NTG) mice, and separate groups of SNCA-null mice, were tested on the Barnes circular maze. Hippocampal slice electrophysiology and transcriptomic profiling were used to explore synaptic function and differential gene expression between groups. Reduction of SNCA transcripts alleviated cognitive deficits in male transgenic animals, but surprisingly, not in females. To determine the functional cause of this differential effect, we assessed memory function in SNCA-null mice. Learning and memory were intact in male mice but impaired in female animals, revealing that the role of αSyn on cognitive function is sex-specific. Transcriptional analyses identified a differentially expressed gene network centered around EGR1, a central modulator of learning and memory, in the hippocampi of SNCA-null mice. Thus, these novel results demonstrate that the function of αSyn on memory differs between male and female brains.
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Affiliation(s)
- Jennifer L. Brown
- Graduate Program in Neuroscience, University of Minnesota, Minneapolis, MN USA
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Damyan W. Hart
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Gabriel E. Boyle
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
- Present Address: Graduate Program in Molecular and Cellular Biology, University of Washington, Seattle, WA 98195 USA
| | - Taylor G. Brown
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Medical Scientist Training Program, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Michael LaCroix
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
- Present Address: Medical Scientist Training Program, University of Texas Southwestern Medical School, Dallas, TX 75390 USA
| | - Andrés M. Baraibar
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Present Address: Department of Neurosciences, University of the Basque Country UPV/EHU, Leioa, Spain
| | - Ross Pelzel
- Graduate Program in Neuroscience, University of Minnesota, Minneapolis, MN USA
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Minwoo Kim
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Mathew A. Sherman
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Samuel Boes
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Michelle Sung
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
- Present Address: Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21218 USA
| | - Tracy Cole
- Ionis Pharmaceuticals Inc., Carlsbad, CA USA
- Present Address: n-Lorem Foundation, Carlsbad, CA 92010 USA
| | - Michael K. Lee
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
| | - Alfonso Araque
- Graduate Program in Neuroscience, University of Minnesota, Minneapolis, MN USA
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
| | - Sylvain E. Lesné
- Graduate Program in Neuroscience, University of Minnesota, Minneapolis, MN USA
- Department of Neuroscience, University of Minnesota, Minneapolis, MN USA
- Institute for Translational Neuroscience, University of Minnesota, Wallin Medical Biosciences Building (Room 4-114), 2101 Sixth Street SE, CDC 2641, Minneapolis, MN 55414 USA
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3
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Grigoryan GA. Neuroinflammation and Reconsolidation of Memory. NEUROCHEM J+ 2022. [DOI: 10.1134/s1819712422020076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Westacott LJ, Humby T, Haan N, Brain SA, Bush EL, Toneva M, Baloc AI, Moon AL, Reddaway J, Owen MJ, Hall J, Hughes TR, Morgan BP, Gray WP, Wilkinson LS. Complement C3 and C3aR mediate different aspects of emotional behaviours; relevance to risk for psychiatric disorder. Brain Behav Immun 2022; 99:70-82. [PMID: 34543680 DOI: 10.1016/j.bbi.2021.09.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/03/2021] [Accepted: 09/13/2021] [Indexed: 12/18/2022] Open
Abstract
Complement is a key component of the immune system with roles in inflammation and host-defence. Here we reveal novel functions of complement pathways impacting on emotional reactivity of potential relevance to the emerging links between complement and risk for psychiatric disorder. We used mouse models to assess the effects of manipulating components of the complement system on emotionality. Mice lacking the complement C3a Receptor (C3aR-/-) demonstrated a selective increase in unconditioned (innate) anxiety whilst mice deficient in the central complement component C3 (C3-/-) showed a selective increase in conditioned (learned) fear. The dissociable behavioural phenotypes were linked to different signalling mechanisms. Effects on innate anxiety were independent of C3a, the canonical ligand for C3aR, consistent with the existence of an alternative ligand mediating innate anxiety, whereas effects on learned fear were due to loss of iC3b/CR3 signalling. Our findings show that specific elements of the complement system and associated signalling pathways contribute differentially to heightened states of anxiety and fear commonly seen in psychopathology.
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Affiliation(s)
- Laura J Westacott
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK
| | - Trevor Humby
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK; Behavioural Genetics Group, Schools of Psychology and Medicine, Cardiff University, Cardiff CF10 3AT, UK
| | - Niels Haan
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK
| | - Sophie A Brain
- Behavioural Genetics Group, Schools of Psychology and Medicine, Cardiff University, Cardiff CF10 3AT, UK
| | - Emma-Louise Bush
- Behavioural Genetics Group, Schools of Psychology and Medicine, Cardiff University, Cardiff CF10 3AT, UK
| | - Margarita Toneva
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK
| | - Andreea-Ingrid Baloc
- Behavioural Genetics Group, Schools of Psychology and Medicine, Cardiff University, Cardiff CF10 3AT, UK
| | - Anna L Moon
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK
| | - Jack Reddaway
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK
| | - Michael J Owen
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK
| | - Jeremy Hall
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK
| | - Timothy R Hughes
- Complement Biology Group, Systems Immunity Research Institute, School of Medicine, Cardiff University, Cardiff CF14 4XW, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK
| | - B Paul Morgan
- Complement Biology Group, Systems Immunity Research Institute, School of Medicine, Cardiff University, Cardiff CF14 4XW, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK; UK Dementia Research Institute, Cardiff University, Cardiff CF24 4HQ, UK
| | - William P Gray
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK; Brain Repair and Intracranial Therapeutics (BRAIN) Unit, School of Medicine, Cardiff University, CF24 4HQ, UK
| | - Lawrence S Wilkinson
- Neuroscience and Mental Health Research Institute, MRC Centre for Neuropsychiatric Genetic and Genomics, School of Medicine, Hadyn Ellis Building, Cardiff University, Cardiff CF24 4HQ, UK; Behavioural Genetics Group, Schools of Psychology and Medicine, Cardiff University, Cardiff CF10 3AT, UK; Hodge Centre for Neuropsychiatric Immunology, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK.
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Muscat SM, Barrientos RM. The Perfect Cytokine Storm: How Peripheral Immune Challenges Impact Brain Plasticity & Memory Function in Aging. Brain Plast 2021; 7:47-60. [PMID: 34631420 PMCID: PMC8461734 DOI: 10.3233/bpl-210127] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Precipitous declines in cognitive function can occur in older individuals following a variety of peripheral immune insults, such as surgery, infection, injury, and unhealthy diet. Aging is associated with numerous changes to the immune system that shed some light on why this abrupt cognitive deterioration may occur. Normally, peripheral-to-brain immune signaling is tightly regulated and advantageous; communication between the two systems is bi-directional, via either humoral or neural routes. Following an immune challenge, production, secretion, and translocation of cytokines into the brain is critical to the development of adaptive sickness behaviors. However, aging is normally associated with neuroinflammatory priming, notably microglial sensitization. Microglia are the brain's innate immune cells and become sensitized with advanced age, such that upon immune stimulation they will mount more exaggerated neuroimmune responses. The resultant elevation of pro-inflammatory cytokine expression, namely IL-1β, has profound effects on synaptic plasticity and, consequentially, cognition. In this review, we (1) investigate the processes which lead to aberrantly elevated inflammatory cytokine expression in the aged brain and (2) examine the impact of the pro-inflammatory cytokine IL-1β on brain plasticity mechanisms, including its effects on BDNF, AMPA and NMDA receptor-mediated long-term potentiation.
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Affiliation(s)
- Stephanie M Muscat
- Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA
- Biomedical Sciences Graduate Program, The Ohio State University, Columbus, OH, USA
| | - Ruth M Barrientos
- Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA
- Department of Psychiatry and Behavioral Health, The Ohio State University, Columbus, OH, USA
- Department of Neuroscience, The Ohio State University, Columbus, OH, USA
- Chronic Brain Injury Program, Discovery Themes Initiative, The Ohio State University, Columbus, OH, USA
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6
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Gene Expression Profile in Different Age Groups and Its Association with Cognitive Function in Healthy Malay Adults in Malaysia. Cells 2021; 10:cells10071611. [PMID: 34199148 PMCID: PMC8304476 DOI: 10.3390/cells10071611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/13/2021] [Accepted: 06/21/2021] [Indexed: 11/16/2022] Open
Abstract
The mechanism of cognitive aging at the molecular level is complex and not well understood. Growing evidence suggests that cognitive differences might also be caused by ethnicity. Thus, this study aims to determine the gene expression changes associated with age-related cognitive decline among Malay adults in Malaysia. A cross-sectional study was conducted on 160 healthy Malay subjects, aged between 28 and 79, and recruited around Selangor and Klang Valley, Malaysia. Gene expression analysis was performed using a HumanHT-12v4.0 Expression BeadChip microarray kit. The top 20 differentially expressed genes at p < 0.05 and fold change (FC) = 1.2 showed that PAFAH1B3, HIST1H1E, KCNA3, TM7SF2, RGS1, and TGFBRAP1 were regulated with increased age. The gene set analysis suggests that the Malay adult's susceptibility to developing age-related cognitive decline might be due to the changes in gene expression patterns associated with inflammation, signal transduction, and metabolic pathway in the genetic network. It may, perhaps, have important implications for finding a biomarker for cognitive decline and offer molecular targets to achieve successful aging, mainly in the Malay population in Malaysia.
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7
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Sykes L, Clifton NE, Hall J, Thomas KL. Regulation of the Expression of the Psychiatric Risk Gene Cacna1c during Associative Learning. MOLECULAR NEUROPSYCHIATRY 2018; 4:149-157. [PMID: 30643788 PMCID: PMC6323400 DOI: 10.1159/000493917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 09/19/2018] [Indexed: 01/12/2023]
Abstract
CACNA1C encodes the Cav1.2 L-type voltage-gated calcium channel. Generic variation in CACNA1C has been consistently identified as associated with risk for psychiatric disorders including schizophrenia, bipolar disorder, major depressive disorder and autism. Psychiatric risk loci are also enriched for genes involved in the regulation of synaptic plasticity. Here, we show that the expression of Cacna1c is regulated in the rat hippocampus after context exposure, contextual fear conditioning and fear memory retrieval in a manner that correlates to specific memory processes. Using quantitative in situ hybridisation, the expression was down-regulated in CA1 by brief exposure to a novel context and to a conditioned context, and up-regulated in the dentate gyrus after contextual fear conditioning. No changes were measured after prolonged context exposure followed by conditioning, a procedure that retards fear conditioning (latent inhibition), nor with fear memory recall leading to extinction. These results are consistent with a selective role for Cav1.2 in the consolidation of context memory and contextual fear memory, and with processes associated with the maintenance of the fear memory after recall. The dysregulation of CACNA1C may thus be related to associative memory dysfunction in schizophrenia and other psychiatric disorders.
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Affiliation(s)
- Lucy Sykes
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, United Kingdom
| | - Nicholas E. Clifton
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, United Kingdom
| | - Jeremy Hall
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, United Kingdom
| | - Kerrie L. Thomas
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, United Kingdom
- School of Biosciences, Cardiff University, Cardiff, United Kingdom
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Young MB, Howell LL, Hopkins L, Moshfegh C, Yu Z, Clubb L, Seidenberg J, Park J, Swiercz AP, Marvar PJ. A peripheral immune response to remembering trauma contributes to the maintenance of fear memory in mice. Psychoneuroendocrinology 2018; 94:143-151. [PMID: 29783162 PMCID: PMC6003662 DOI: 10.1016/j.psyneuen.2018.05.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/05/2018] [Accepted: 05/07/2018] [Indexed: 10/16/2022]
Abstract
Alterations in peripheral immune markers are observed in individuals with post-traumatic stress disorder (PTSD). PTSD is characterized in part by impaired extinction of fear memory for a traumatic experience. We hypothesized that fear memory extinction is regulated by immune signaling stimulated when fear memory is retrieved. The relationship between fear memory and the peripheral immune response was tested using auditory Pavlovian fear conditioning in mice. Memory for the association was quantified by the amount of conditioned freezing exhibited in response to the conditioned stimulus (CS), extinction and time-dependent changes in circulating inflammatory cytokines. Brief extinction training with 12 CS rapidly and acutely increased circulating levels of the cytokine interleukin-6 (IL-6), downstream IL-6 signaling, other IL-6 related pro-inflammatory cytokines. Transgenic manipulations or neutralizing antibodies that inhibit IL-6 activity did not affect conditioned freezing during the acquisition of fear conditioning or extinction but significantly reduced conditioned freezing 24 h after extinction training with 12 CS. Conversely, conditioned freezing after extinction training was unchanged by IL-6 inhibition when 40 CS were used during the extinction training session. In addition to effectively diminishing conditioned freezing, extinction training with 40 CS also diminished the subsequent IL-6 response to the CS. These data demonstrate that IL-6 released following fear memory retrieval contributes to the maintenance of that fear memory and that this effect is extinction dependent. These findings extend the current understanding for the role of the immune system in PTSD and suggest that IL-6 and other IL-6 related pro-inflammatory cytokines may contribute to the persistence of fear memory in PTSD where fear memory extinction is impaired.
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Affiliation(s)
- Matthew B. Young
- Division of Neuropharmacology and Neurological Disease, Yerkes National Primate Research Center, Emory University, Atlanta GA, USA; (404) 727-8512; (404) 727-7786
| | - Leonard L. Howell
- Division of Neuropharmacology and Neurological Disease, Yerkes National Primate Research Center, Emory University, Atlanta GA, USA; (404) 727-8512; (404) 727-7786
| | - Lauren Hopkins
- Department of Pharmacology and Physiology, George Washington University, Washington DC, USA.
| | - Cassandra Moshfegh
- Department of Pharmacology and Physiology, George Washington University, Washington DC, USA.
| | - Zhe Yu
- Department of Pharmacology and Physiology, George Washington University, Washington DC, USA.
| | - Lauren Clubb
- Department of Pharmacology and Physiology, George Washington University, Washington DC, USA.
| | - Jessica Seidenberg
- Department of Pharmacology and Physiology, George Washington University, Washington DC, USA.
| | - Jeanie Park
- Renal Division, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA,Research Service Line, Atlanta VA Medical Center, Decatur, GA, USA
| | - Adam P. Swiercz
- Department of Pharmacology and Physiology, Washington DC, USA
| | - Paul J. Marvar
- Department of Pharmacology and Physiology, Washington DC, USA,Department of Psychiatry and Behavioral Sciences, Washington DC, USA; (202) 994-5584,GW Institute for Neuroscience George Washington University, Washington DC, USA,Correspondence to:
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9
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Takemiya T, Fumizawa K, Yamagata K, Iwakura Y, Kawakami M. Brain Interleukin-1 Facilitates Learning of a Water Maze Spatial Memory Task in Young Mice. Front Behav Neurosci 2017; 11:202. [PMID: 29123474 PMCID: PMC5662897 DOI: 10.3389/fnbeh.2017.00202] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 10/06/2017] [Indexed: 01/11/2023] Open
Abstract
The proinflammatory cytokine interleukin-1 (IL-1) is produced by many types of cells, including immune cells in the periphery and glia and neurons in the brain. The type I IL-1 receptor (IL-1r1) is primarily responsible for transmitting the inflammatory effects of IL-1 and mediates several biological functions by binding to either IL-1α or IL-1β. IL-1β activation is associated with hippocampus-dependent memory tasks. Although IL-1β impairs spatial memory under certain pathophysiological conditions, IL-1β may be required for the normal physiological regulation of hippocampal plasticity and memory. In addition, brain IL-1β levels are thought to change in the hippocampus in an age-dependent manner. These findings suggest that IL-1β may have a beneficial, temporary effect on learning and memory in young mice, but the matter remains unclear. Therefore, we hypothesized that hippocampal IL-1β has a beneficial effect on spatial learning and memory in young mice via IL-1r1, which is diminished in adults. We investigated the performance of young (3-month-old) and adult (6-month-old) wild-type mice, IL-1β knockout mice (IL-1βko) and IL-1r1 knockout mice (IL-1r1ko) in learning a spatial memory task with a fixed platform in a water maze (WM) and measured the levels of IL-1β and IL-1α in the hippocampus and cortex of adult and young mice by using homogeneous time-resolved fluorescence (HTRF). Learning was significantly impaired in the training trials of the WM spatial memory task in young IL-1βko and IL-1r1ko mice but not in adult IL-1βko and IL-1r1ko mice. Moreover, young IL-1r1ko mice but not IL-1βko mice showed an impairment in long-term memory extinction, suggesting that IL-1α might facilitate memory extinction. In this study, the cytokine assay using HTRF did not indicate a higher expression of hippocampal IL-1 in young mice but cortical IL-1β and IL-1α were significantly increased in adult mice. We need to investigate the role of cortical IL-1 and the local IL-1 expression in the hippocampal neurons in the future.
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Affiliation(s)
- Takako Takemiya
- Medical Research Institute, Tokyo Women's Medical University, Tokyo, Japan
| | - Kumiko Fumizawa
- Medical Research Institute, Tokyo Women's Medical University, Tokyo, Japan
| | - Kanato Yamagata
- Synaptic Plasticity Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Yoichiro Iwakura
- Center for Experimental Animal Models, Institute for Biomedical Sciences, Tokyo University of Science, Chiba, Japan
| | - Marumi Kawakami
- Medical Research Institute, Tokyo Women's Medical University, Tokyo, Japan
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Clifton NE, Pocklington AJ, Scholz B, Rees E, Walters JTR, Kirov G, O'Donovan MC, Owen MJ, Wilkinson LS, Thomas KL, Hall J. Schizophrenia copy number variants and associative learning. Mol Psychiatry 2017; 22:178-182. [PMID: 27956746 PMCID: PMC5285462 DOI: 10.1038/mp.2016.227] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 09/13/2016] [Accepted: 10/11/2016] [Indexed: 12/21/2022]
Abstract
Large-scale genomic studies have made major progress in identifying genetic risk variants for schizophrenia. A key finding from these studies is that there is an increased burden of genomic copy number variants (CNVs) in schizophrenia cases compared with controls. The mechanism through which these CNVs confer risk for the symptoms of schizophrenia, however, remains unclear. One possibility is that schizophrenia risk CNVs impact basic associative learning processes, abnormalities of which have long been associated with the disorder. To investigate whether genes in schizophrenia CNVs impact on specific phases of associative learning we combined human genetics with experimental gene expression studies in animals. In a sample of 11 917 schizophrenia cases and 16 416 controls, we investigated whether CNVs from patients with schizophrenia are enriched for genes expressed during the consolidation, retrieval or extinction of associative memories. We show that CNVs from cases are enriched for genes expressed during fear extinction in the hippocampus, but not genes expressed following consolidation or retrieval. These results suggest that CNVs act to impair inhibitory learning in schizophrenia, potentially contributing to the development of core symptoms of the disorder.
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Affiliation(s)
- N E Clifton
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
| | - A J Pocklington
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
| | - B Scholz
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
| | - E Rees
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
| | - J T R Walters
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
| | - G Kirov
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
| | - M C O'Donovan
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
| | - M J Owen
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
| | - L S Wilkinson
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
- School of Psychology, Cardiff University, Cardiff, UK
| | - K L Thomas
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
- School of Biosciences, Cardiff University, Cardiff, UK
| | - J Hall
- Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK
- MRC Centre for Neuropsychiatric Genetics and Genomics, Institute of Psychological Medicine and Clinical Neurosciences, Cardiff University, Cardiff, UK
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Jurkus R, Day HLL, Guimarães FS, Lee JLC, Bertoglio LJ, Stevenson CW. Cannabidiol Regulation of Learned Fear: Implications for Treating Anxiety-Related Disorders. Front Pharmacol 2016; 7:454. [PMID: 27932983 PMCID: PMC5121237 DOI: 10.3389/fphar.2016.00454] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 11/11/2016] [Indexed: 01/04/2023] Open
Abstract
Anxiety and trauma-related disorders are psychiatric diseases with a lifetime prevalence of up to 25%. Phobias and post-traumatic stress disorder (PTSD) are characterized by abnormal and persistent memories of fear-related contexts and cues. The effects of psychological treatments such as exposure therapy are often only temporary and medications can be ineffective and have adverse side effects. Growing evidence from human and animal studies indicates that cannabidiol, the main non-psychotomimetic phytocannabinoid present in Cannabis sativa, alleviates anxiety in paradigms assessing innate fear. More recently, the effects of cannabidiol on learned fear have been investigated in preclinical studies with translational relevance for phobias and PTSD. Here we review the findings from these studies, with an emphasis on cannabidiol regulation of contextual fear. The evidence indicates that cannabidiol reduces learned fear in different ways: (1) cannabidiol decreases fear expression acutely, (2) cannabidiol disrupts memory reconsolidation, leading to sustained fear attenuation upon memory retrieval, and (3) cannabidiol enhances extinction, the psychological process by which exposure therapy inhibits learned fear. We also present novel data on cannabidiol regulation of learned fear related to explicit cues, which indicates that auditory fear expression is also reduced acutely by cannabidiol. We conclude by outlining future directions for research to elucidate the neural circuit, psychological, cellular, and molecular mechanisms underlying the regulation of fear memory processing by cannabidiol. This line of investigation may lead to the development of cannabidiol as a novel therapeutic approach for treating anxiety and trauma-related disorders such as phobias and PTSD in the future.
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Affiliation(s)
- Regimantas Jurkus
- School of Mathematical Sciences, University of Nottingham University Park, Nottingham, UK
| | - Harriet L L Day
- School of Biosciences, University of Nottingham Loughborough, UK
| | | | | | - Leandro J Bertoglio
- Department of Pharmacology, Federal University of Santa Catarina Florianopolis, Brazil
| | - Carl W Stevenson
- School of Biosciences, University of Nottingham Loughborough, UK
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