1
|
Bransom L, Bassett AP, Zhou M, Cimino JX, Mailman RB, Yang Y. Dopamine D 1 Receptor Agonists Rescue Age-related Decline in Temporal Order Memory. Neuroscience 2024; 551:177-184. [PMID: 38823551 PMCID: PMC11246218 DOI: 10.1016/j.neuroscience.2024.05.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 05/08/2024] [Accepted: 05/27/2024] [Indexed: 06/03/2024]
Abstract
Dopamine D1 receptor agonists improve spatial working memory, but their effects on temporal order memory, particularly prone to the effects of aging, have not been studied. Two D1 agonists, PF6256142 (PF) and 2-methyldihydrexidine (2MDHX), were examined for their effects in a rodent temporal order recognition task. Our results are consistent with the hypothesis that there is an age-related decline in rodent temporal order memory. The data also show that either agonist rescues the poor memory performance with a large effective size. Interestingly, the optimal effective dose varied among individual rats of different age groups. PF showed greater potency for older rats, whereas 2MDHX showed better overall population effectiveness. Both PF and 2MDHX have high intrinsic activity at rodent D1-mediated cAMP synthesis. Conversely, at D1-mediated β-arrestin recruitment, PF has essentially no intrinsic activity, whereas 2MDHX is a super-agonist. These findings suggest that D1 agonists have potential to treat age-related cognitive decline, and the pattern of functional selectivity may be useful for developing drugs with an improved therapeutic index.
Collapse
Affiliation(s)
- Luke Bransom
- Department of Pharmacology, Penn State University College of Medicine, Hershey PA 17033, United States
| | - Ava P Bassett
- Department of Pharmacology, Penn State University College of Medicine, Hershey PA 17033, United States
| | - Mi Zhou
- Department of Pharmacology, Penn State University College of Medicine, Hershey PA 17033, United States; Department of Neurology, Penn State University College of Medicine, Hershey, PA 17033, United States
| | - Jack X Cimino
- Department of Pharmacology, Penn State University College of Medicine, Hershey PA 17033, United States
| | - Richard B Mailman
- Department of Pharmacology, Penn State University College of Medicine, Hershey PA 17033, United States; Department of Neurology, Penn State University College of Medicine, Hershey, PA 17033, United States
| | - Yang Yang
- Department of Pharmacology, Penn State University College of Medicine, Hershey PA 17033, United States.
| |
Collapse
|
2
|
Bakoyiannis I, Ducourneau EG, N'diaye M, Fermigier A, Ducroix-Crepy C, Bosch-Bouju C, Coutureau E, Trifilieff P, Ferreira G. Obesogenic diet induces circuit-specific memory deficits in mice. eLife 2024; 13:e80388. [PMID: 38436653 PMCID: PMC10911750 DOI: 10.7554/elife.80388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 02/13/2024] [Indexed: 03/05/2024] Open
Abstract
Obesity is associated with neurocognitive dysfunction, including memory deficits. This is particularly worrisome when obesity occurs during adolescence, a maturational period for brain structures critical for cognition. In rodent models, we recently reported that memory impairments induced by obesogenic high-fat diet (HFD) intake during the periadolescent period can be reversed by chemogenetic manipulation of the ventral hippocampus (vHPC). Here, we used an intersectional viral approach in HFD-fed male mice to chemogenetically inactivate specific vHPC efferent pathways to nucleus accumbens (NAc) or medial prefrontal cortex (mPFC) during memory tasks. We first demonstrated that HFD enhanced activation of both pathways after training and that our chemogenetic approach was effective in normalizing this activation. Inactivation of the vHPC-NAc pathway rescued HFD-induced deficits in recognition but not location memory. Conversely, inactivation of the vHPC-mPFC pathway restored location but not recognition memory impairments produced by HFD. Either pathway manipulation did not affect exploration or anxiety-like behaviour. These findings suggest that HFD intake throughout adolescence impairs different types of memory through overactivation of specific hippocampal efferent pathways and that targeting these overactive pathways has therapeutic potential.
Collapse
Affiliation(s)
- Ioannis Bakoyiannis
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | - Eva Gunnel Ducourneau
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | - Mateo N'diaye
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | - Alice Fermigier
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | - Celine Ducroix-Crepy
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | - Clementine Bosch-Bouju
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | | | - Pierre Trifilieff
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| | - Guillaume Ferreira
- University of Bordeaux, INRAE, Bordeaux INP, NutriNeuro, UMR 1286, F-33077BordeauxFrance
| |
Collapse
|
3
|
Jahreis K, Brüge A, Borsdorf S, Müller FE, Sun W, Jia S, Kang DM, Boesen N, Shin S, Lim S, Koroleva A, Satała G, Bojarski AJ, Rakuša E, Fink A, Doblhammer-Reiter G, Kim YK, Dityatev A, Ponimaskin E, Labus J. Amisulpride as a potential disease-modifying drug in the treatment of tauopathies. Alzheimers Dement 2023; 19:5482-5497. [PMID: 37218673 DOI: 10.1002/alz.13090] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 05/24/2023]
Abstract
INTRODUCTION Hyperphosphorylation and aggregation of the microtubule-associated protein tau cause the development of tauopathies, such as Alzheimer's disease and frontotemporal dementia (FTD). We recently uncovered a causal link between constitutive serotonin receptor 7 (5-HT7R) activity and pathological tau aggregation. Here, we evaluated 5-HT7R inverse agonists as novel drugs in the treatment of tauopathies. METHODS Based on structural homology, we screened multiple approved drugs for their inverse agonism toward 5-HT7R. Therapeutic potential was validated using biochemical, pharmacological, microscopic, and behavioral approaches in different cellular models including tau aggregation cell line HEK293 tau bimolecular fluorescence complementation, primary mouse neurons, and human induced pluripotent stem cell-derived neurons carrying an FTD-associated tau mutation as well as in two mouse models of tauopathy. RESULTS Antipsychotic drug amisulpride is a potent 5-HT7R inverse agonist. Amisulpride ameliorated tau hyperphosphorylation and aggregation in vitro. It further reduced tau pathology and abrogated memory impairment in mice. DISCUSSION Amisulpride may be a disease-modifying drug for tauopathies.
Collapse
Affiliation(s)
- Kathrin Jahreis
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Alina Brüge
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Saskia Borsdorf
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Franziska E Müller
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Weilun Sun
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany
| | - Shaobo Jia
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany
| | - Dong Min Kang
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Department of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Nicolette Boesen
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology (UST), Seoul, Republic of Korea
| | - Seulgi Shin
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Sungsu Lim
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Anastasia Koroleva
- Department of Nanoengineering, Institute of Quantum Optics, Leibniz University Hannover, Hannover, Germany
| | - Grzegorz Satała
- Maj Institute of Pharmacology, Polish Academy of Sciences, Krakow, Poland
| | - Andrzej J Bojarski
- Maj Institute of Pharmacology, Polish Academy of Sciences, Krakow, Poland
| | - Elena Rakuša
- German Center for Neurodegenerative Diseases (DZNE), Rostock, Germany
| | - Anne Fink
- German Center for Neurodegenerative Diseases (DZNE), Rostock, Germany
| | | | - Yun Kyung Kim
- Brain Science Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Maj Institute of Pharmacology, Polish Academy of Sciences, Krakow, Poland
| | - Alexander Dityatev
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany
- Medical Faculty, Otto-von-Guericke University, Magdeburg, Germany
- Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany
| | - Evgeni Ponimaskin
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Josephine Labus
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| |
Collapse
|
4
|
Varbanov H, Jia S, Kochlamazashvili G, Bhattacharya S, Buabeid MA, El Tabbal M, Hayani H, Stoyanov S, Sun W, Thiesler H, Röckle I, Hildebrandt H, Senkov O, Suppiramaniam V, Gerardy-Schahn R, Dityatev A. Rescue of synaptic and cognitive functions in polysialic acid-deficient mice and dementia models by short polysialic acid fragments. Neurobiol Dis 2023; 180:106079. [PMID: 36918046 DOI: 10.1016/j.nbd.2023.106079] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/04/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023] Open
Abstract
Dysregulated cortical expression of the neural cell adhesion molecule (NCAM) and deficits of its associated polysialic acid (polySia) have been found in Alzheimer's disease and schizophrenia. However, the functional role of polySia in cortical synaptic plasticity remains poorly understood. Here, we show that acute enzymatic removal of polySia in medial prefrontal cortex (mPFC) slices leads to increased transmission mediated by the GluN1/GluN2B subtype of N-methyl-d-aspartate receptors (NMDARs), increased NMDAR-mediated extrasynaptic tonic currents, and impaired long-term potentiation (LTP). The latter could be fully rescued by pharmacological suppression of GluN1/GluN2B receptors, or by application of short soluble polySia fragments that inhibited opening of GluN1/GluN2B channels. These treatments and augmentation of synaptic NMDARs with the glycine transporter type 1 (GlyT1) inhibitor sarcosine also restored LTP in mice deficient in polysialyltransferase ST8SIA4. Furthermore, the impaired performance of polySia-deficient mice and two models of Alzheimer's disease in the mPFC-dependent cognitive tasks could be rescued by intranasal administration of polySia fragments. Our data demonstrate the essential role of polySia-NCAM in the balancing of signaling through synaptic/extrasynaptic NMDARs in mPFC and highlight the therapeutic potential of short polySia fragments to restrain GluN1/GluN2B-mediated signaling.
Collapse
Affiliation(s)
- Hristo Varbanov
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany; Institute of Neurophysiology, Hannover Medical School, OE 4230, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Shaobo Jia
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany
| | - Gaga Kochlamazashvili
- Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, 16163 Genova, Italy; Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Roessle-Straße 10, 13125 Berlin, Germany
| | - Subhrajit Bhattacharya
- School of Pharmaceutical and Health Sciences, Keck Graduate Institute, Claremont Colleges, Claremont, CA 91711, USA
| | - Manal Ali Buabeid
- Department of Drug Discovery and Development, School of Pharmacy, Auburn University, Auburn, AL 36849, USA
| | - Mohamed El Tabbal
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany
| | - Hussam Hayani
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany
| | - Stoyan Stoyanov
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany
| | - Weilun Sun
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany
| | - Hauke Thiesler
- Institute for Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Iris Röckle
- Institute for Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Herbert Hildebrandt
- Institute for Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany; Center for Systems Neuroscience Hannover (ZSN), Bünteweg 2, 30559 Hannover, Germany
| | - Oleg Senkov
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany
| | - Vishnu Suppiramaniam
- Department of Drug Discovery and Development, School of Pharmacy, Auburn University, Auburn, AL 36849, USA; College of Science and Mathematics, Kennesaw State University, GA 30144, USA
| | - Rita Gerardy-Schahn
- Institute for Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Alexander Dityatev
- German Center for Neurodegenerative Diseases (DZNE), Leipziger Str. 44, 39120 Magdeburg, Germany; Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, 16163 Genova, Italy; Medical Faculty, Otto-von-Guericke-University, Magdeburg, Leipziger Str. 44, 39120 Magdeburg, Germany; Center for Behavioral Brain Sciences (CBBS), Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
| |
Collapse
|
5
|
Waite L, Bonardi C, Stevenson CW, Cassaday HJ. Strain comparisons in inhibitory discrimination learning and novel object recognition procedures. Physiol Behav 2021; 240:113557. [PMID: 34400194 PMCID: PMC8476941 DOI: 10.1016/j.physbeh.2021.113557] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/03/2021] [Accepted: 08/11/2021] [Indexed: 11/26/2022]
Abstract
Strain differences in visual abilities and exploratory tendencies can confound rats' performance in cognitive tests of learning and memory. In the present study we compared the performance of albino Wistar and pigmented Lister Hooded rats in appetitive conditioning and recognition memory procedures, specifically within-subjects inhibitory learning (A+ /AX-) and novel object recognition (NOR) variants. The inhibition task included an excitatory training stage and summation and retardation tests. Difference scores were used to help control for individual variation in baseline nosepoke responding. NOR was tested after a 10 min delay, following 24hr delay and using a recency variant. Discrimination ratios were used to control for individual variation in exploratory activity. In the inhibitory learning procedure, Lister Hooded showed more magazine activity prior to stimulus presentations than Wistar rats but this was a transient effect restricted to day 1 of excitatory training. There was no strain difference in associative learning at the excitatory training stage. The Wistars went on to show some performance advantage at the inhibitory discrimination stage and marginally stronger retardation test performance. In the NOR tasks, there was no significant effect of strain on cognitive performance, but the Wistars showed some advantage in the 10 min delay variant, whereas in the 24hr delay and relative recency NOR variants, the Lister Hooded rats showed some advantage. Overall the results of the present study confirm the suitability of Wistar rats for use in associative learning and basic NOR procedures.
Collapse
Affiliation(s)
- L Waite
- School of Psychology, University of Nottingham,UK
| | - C Bonardi
- School of Psychology, University of Nottingham,UK
| | | | - H J Cassaday
- School of Psychology, University of Nottingham,UK
| |
Collapse
|
6
|
Wait J, Burns C, Jones T, Harper Z, Allen E, Langley‐Evans SC, Voigt J. Early postnatal exposure to a cafeteria diet interferes with recency and spatial memory, but not open field habituation in adolescent rats. Dev Psychobiol 2020; 63:572-581. [DOI: 10.1002/dev.22063] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 10/06/2020] [Accepted: 10/24/2020] [Indexed: 12/17/2022]
Affiliation(s)
- Janina Wait
- School of Veterinary Medicine and Science University of Nottingham Loughborough UK
| | - Catherine Burns
- School of Veterinary Medicine and Science University of Nottingham Loughborough UK
| | - Taylor Jones
- School of Veterinary Medicine and Science University of Nottingham Loughborough UK
| | - Zoe Harper
- School of Veterinary Medicine and Science University of Nottingham Loughborough UK
| | - Emily Allen
- School of Veterinary Medicine and Science University of Nottingham Loughborough UK
| | | | - Jörg‐Peter Voigt
- School of Veterinary Medicine and Science University of Nottingham Loughborough UK
| |
Collapse
|
7
|
Haddar M, Azuma K, Izuo N, Kyosuke U, Asano T, Muramatsu SI, Nitta A. Impairment of cognitive function induced by Shati/Nat8l overexpression in the prefrontal cortex of mice. Behav Brain Res 2020; 397:112938. [PMID: 32998043 DOI: 10.1016/j.bbr.2020.112938] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 09/16/2020] [Accepted: 09/21/2020] [Indexed: 10/23/2022]
Abstract
A novel N-acetyltransferase, Shati/Nat8l, was identified in the brains of mice exposed to methamphetamine. Shati/Nat8l overexpression in the medial prefrontal cortex (mPFC) was found to attenuate methamphetamine-induced dependence. The mPFC is a brain region that plays an important role in cognitive function. However, the effect of Shati/Nat8l on cognition and memory has not yet been clarified. To understand the role of Shati/Nat8l in memory, we generated C57BL/6J mice with overexpressed Shati/Nat8l in the mPFC and performed memory-related experiments, including novel object-location and object-in-context tests. Furthermore, we used quantitative immunohistochemistry to assess the presynaptic and postsynaptic proteins, synaptophysin and postsynaptic density protein (PSD)-95, respectively. Shati/Nat8l overexpression in the mPFC impaired both novel object-location and object-in-context memory. Moreover, Shati/Nat8l overexpression in the mPFC reduced PSD-95 levels, but not synaptophysin levels in the mPFC. These results demonstrated that Shati/Nat8l overexpression in the mPFC is involved in location and contextual memory, and can affect the excitatory postsynaptic protein, PSD-95.
Collapse
Affiliation(s)
- Meriem Haddar
- Department of Pharmaceutical Therapy and Neuropharmacology, Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Katsunori Azuma
- Department of Pharmaceutical Therapy and Neuropharmacology, Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Naotaka Izuo
- Department of Pharmaceutical Therapy and Neuropharmacology, Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Uno Kyosuke
- Department of Pharmaceutical Therapy and Neuropharmacology, Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama, Japan; Laboratory of Molecular Pharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, Hirakata-shi, Osaka, Japan
| | - Takashi Asano
- Department of Pharmaceutical Therapy and Neuropharmacology, Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Shin-Ichi Muramatsu
- Division of Neurological Gene Therapy, Open Innovation Center, Jichi Medical University, Shimotsuke, Japan; Center for Gene & Cell Therapy, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Atsumi Nitta
- Department of Pharmaceutical Therapy and Neuropharmacology, Faculty of Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, University of Toyama, Toyama, Japan.
| |
Collapse
|
8
|
Pan X, Kaminga AC, Jia P, Wen SW, Acheampong K, Liu A. Catecholamines in Alzheimer's Disease: A Systematic Review and Meta-Analysis. Front Aging Neurosci 2020; 12:184. [PMID: 33024430 PMCID: PMC7516036 DOI: 10.3389/fnagi.2020.00184] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 05/26/2020] [Indexed: 12/11/2022] Open
Abstract
Background and Purpose: Previous studies found inconsistent results regarding the relationship between Alzheimer's disease (AD) and catecholamines, such as dopamine (DA), norepinephrine (NE), and epinephrine (EPI). Therefore, the purpose of this study was to perform a systematic review and meta-analysis to evaluate the results of previous studies on this relationship. Method: Literature retrieval of eligible studies was performed in four databases (Web of Science, PubMed, Embase, and PsycARTICLES). Standardized mean differences (SMDs) were calculated to assess differences in catecholamine concentrations between the AD groups and controls. Results: Thirteen studies met the eligibility criteria. Compared with the controls, significant lower concentrations of NE (SMD = −1.10, 95% CI: −2.01 to −0.18, p = 0.019) and DA (SMD = −1.12, 95% CI: −1.88 to −0.37, p = 0.003) were observed in patients with AD. No difference was found in the concentrations of EPI between the two groups (SMD = −0.74, 95% CI: −1.85 to 0.37, p = 0.189). Conclusion: Overall, these findings are in line with the hypothesis that reduced NE and DA may be an important indicator for AD (Registration number CRD42018112816).
Collapse
Affiliation(s)
- Xiongfeng Pan
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| | - Atipatsa C Kaminga
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China.,Department of Mathematics and Statistics, Mzuzu University, Mzuzu, Malawi
| | - Peng Jia
- Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China.,International Initiative on Spatial Lifecourse Epidemiology (ISLE), Hong Kong, China.,Faculty of Geo-Information Science and Earth Observation, University of Twente, Enschede, Netherlands
| | - Shi Wu Wen
- Department of Obstetrics and Gynaecology, University of Ottawa, Ottawa, ON, Canada.,Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Kwabena Acheampong
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China.,Department of Public, School of Postgraduate Studies, Adventist University of Africa, Nairobi, Kenya
| | - Aizhong Liu
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
| |
Collapse
|
9
|
Labus J, Röhrs KF, Ackmann J, Varbanov H, Müller FE, Jia S, Jahreis K, Vollbrecht AL, Butzlaff M, Schill Y, Guseva D, Böhm K, Kaushik R, Bijata M, Marin P, Chaumont-Dubel S, Zeug A, Dityatev A, Ponimaskin E. Amelioration of Tau pathology and memory deficits by targeting 5-HT7 receptor. Prog Neurobiol 2020; 197:101900. [PMID: 32841723 DOI: 10.1016/j.pneurobio.2020.101900] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 07/21/2020] [Accepted: 08/17/2020] [Indexed: 01/01/2023]
Abstract
Tauopathies comprise a heterogeneous family of neurodegenerative diseases characterized by pathological accumulation of hyperphosphorylated Tau protein. Pathological changes in serotonergic signaling have been associated with tauopathy etiology, but the underlying mechanisms remain poorly understood. Here, we studied the role of the serotonin receptor 7 (5-HT7R), in a mouse model of tauopathy induced by overexpressing the human Tau[R406W] mutant associated with inherited forms of frontotemporal dementia. We showed that the constitutive 5-HT7R activity is required for Tau hyperphosphorylation and formation of highly bundled Tau structures (HBTS) through G-protein-independent, CDK5-dependent mechanism. We also showed that 5-HT7R physically interacts with CDK5. At the systemic level, 5-HT7R-mediated CDK5 activation induces HBTS leading to neuronal death, reduced long-term potentiation (LTP), and impaired memory in mice. Specific blockade of constitutive 5-HT7R activity in neurons that overexpressed Tau[R406W] prevents Tau hyperphosphorylation, aggregation, and neurotoxicity. Moreover, 5-HT7R knockdown in the prefrontal cortex fully abrogates Tau[R406W]-induced LTP deficits and memory impairments. Thus, 5-HT7R/CDK5 signaling emerged as a new, promising target for tauopathy treatments.
Collapse
Affiliation(s)
- Josephine Labus
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Kian-Fritz Röhrs
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany; Department of Neurology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Jana Ackmann
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Hristo Varbanov
- Instituite of Neurophysiology, Hannover Medical School, Hannover, Germany; German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany
| | - Franziska E Müller
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Shaobo Jia
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany
| | - Kathrin Jahreis
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Anna-Lena Vollbrecht
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Malte Butzlaff
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Yvonne Schill
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Daria Guseva
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Katrin Böhm
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany
| | - Rahul Kaushik
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany; Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany
| | - Monika Bijata
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany; Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology of the Polish Academy of Science, Warsaw, Poland
| | - Philippe Marin
- IGF, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | | | - Andre Zeug
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany
| | - Alexander Dityatev
- German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany; Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany; Medical Faculty, Otto-von-Guericke University, Magdeburg, Germany.
| | - Evgeni Ponimaskin
- Department of Cellular Neurophysiology, Hannover Medical School, Hannover, Germany; Institute of Neuroscience, Lobachevsky State University of Nizhni Novgorod, Russia.
| |
Collapse
|
10
|
The medial prefrontal cortex - hippocampus circuit that integrates information of object, place and time to construct episodic memory in rodents: Behavioral, anatomical and neurochemical properties. Neurosci Biobehav Rev 2020; 113:373-407. [PMID: 32298711 DOI: 10.1016/j.neubiorev.2020.04.007] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 02/25/2020] [Accepted: 04/06/2020] [Indexed: 12/31/2022]
Abstract
Rats and mice have been demonstrated to show episodic-like memory, a prototype of episodic memory, as defined by an integrated memory of the experience of an object or event, in a particular place and time. Such memory can be assessed via the use of spontaneous object exploration paradigms, variably designed to measure memory for object, place, temporal order and object-location inter-relationships. We review the methodological properties of these tests, the neurobiology about time and discuss the evidence for the involvement of the medial prefrontal cortex (mPFC), entorhinal cortex (EC) and hippocampus, with respect to their anatomy, neurotransmitter systems and functional circuits. The systematic analysis suggests that a specific circuit between the mPFC, lateral EC and hippocampus encodes the information for event, place and time of occurrence into the complex episodic-like memory, as a top-down regulation from the mPFC onto the hippocampus. This circuit can be distinguished from the neuronal component memory systems for processing the individual information of object, time and place.
Collapse
|
11
|
Functional lateralization in the prefrontal cortex of dopaminergic modulation of memory consolidation. Behav Pharmacol 2020; 30:514-520. [PMID: 31033526 DOI: 10.1097/fbp.0000000000000483] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
There is increasing evidence of functional lateralization within the rat brain. Here, we have examined the lateralization of dopamine (DA) function in the medial prefrontal cortex (PFC) in relation to memory consolidation in the novel object recognition test (NOR). Male Wistar rats received single bilateral or unilateral injections into prelimbic-PFC of agonists (SKF81297; 0.2 µg, quinpirole; 1 µg, SB277,011; 0.5 µg) and antagonists (SCH23390; 3 µg, L-741,626; 1 µg, 7-OH-DPAT; 3 µg) at DA D1, D2, or D3 receptors, immediately following the exposure trial in the NOR, and were tested either 1 or 24 h later for discrimination between a novel and a familiar object. As previously reported, bilateral injection of a D1 antagonist (SCH23390, 3 µg/side), a D2 antagonist (L-741,626, 1 µg/side) or a D3 agonist (7-OH-DPAT, 3 µg/side) impaired NOR at 1 h, while a D1 agonist (SKF81297, 0.2 µg/side), a D2 agonist (quinpirole, 1 µg/side) or a D3 antagonist (SB277,011, 0.5 µg/side) improved NOR at 24 h. The same effects were seen with left-sided unilateral injections. No effects were seen with right-sided unilateral injections. Endogenous DA release in the prelimbic-PFC promotes memory consolidation in the NOR, but only on the left side of the brain.
Collapse
|
12
|
Marshall HJ, Pezze MA, Fone KCF, Cassaday HJ. Age-related differences in appetitive trace conditioning and novel object recognition procedures. Neurobiol Learn Mem 2019; 164:107041. [PMID: 31351120 PMCID: PMC6857625 DOI: 10.1016/j.nlm.2019.107041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 05/31/2019] [Accepted: 07/10/2019] [Indexed: 11/25/2022]
Abstract
Longitudinal study of middle age in the rat with matched younger control cohort. Appetitive trace conditioning and novel object recognition tests of working memory. Transient between-groups working memory impairments aged 12 compared with 2 months. Object exploration reduced with age but working memory recovered. Object exploration and ITI nosepoking showed some correlation with 5-HIAA/5-HT.
Appetitive trace conditioning (TC) was examined over 6 months in younger-adult (2–8 months) and middle-aged (12–18 months) male Wistar RccHan rats, to test for early age-related impairment in working memory. Novel object recognition (NOR) was included as a comparison task, to provide a positive control in the event that the expected impairment in TC was not demonstrated. The results showed that TC improved at both ages at the 2 s but not at the 10 s trace interval. There was, however, evidence for reduced improvement from one day to the next in the middle-aged cohort tested with the 2 s trace conditioned stimulus. Moreover, within the 10 s trace, responding progressively distributed later in the trace interval, in the younger-adult but not the middle-aged cohort. Middle-aged rats showed NOR discriminative impairment at a 24 h but not at a 10 min retention interval. Object exploration was overall reduced in middle-aged rats and further reduced longitudinally. At the end of the study, assessing neurochemistry by HPLC-ED showed reduced 5-HIAA/5-HT in the dorsal striatum of the middle-aged rats and some correlations between striatal 5-HIAA/5-HT and activity parameters. Overall the results suggest that, taken in isolation, age-related impairments may be overcome by experience. This recovery in performance was seen despite the drop in activity levels in older animals, which might be expected to contribute to cognitive decline.
Collapse
Affiliation(s)
- Hayley J Marshall
- University of Nottingham, Psychology, University Park, Nottingham NG72RD, United Kingdom
| | - Marie A Pezze
- University of Nottingham, Psychology, University Park, Nottingham NG72RD, United Kingdom
| | - Kevin C F Fone
- University of Nottingham, Psychology, University Park, Nottingham NG72RD, United Kingdom
| | - Helen J Cassaday
- University of Nottingham, Psychology, University Park, Nottingham NG72RD, United Kingdom.
| |
Collapse
|
13
|
Moreton E, Baron P, Tiplady S, McCall S, Clifford B, Langley-Evans S, Fone K, Voigt J. Impact of early exposure to a cafeteria diet on prefrontal cortex monoamines and novel object recognition in adolescent rats. Behav Brain Res 2019; 363:191-198. [DOI: 10.1016/j.bbr.2019.02.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 01/24/2019] [Accepted: 02/02/2019] [Indexed: 12/19/2022]
|
14
|
Pezze MA, Marshall HJ, Fone KC, Cassaday HJ. Role of the anterior cingulate cortex in the retrieval of novel object recognition memory after a long delay. ACTA ACUST UNITED AC 2017; 24:310-317. [PMID: 28620078 PMCID: PMC5473111 DOI: 10.1101/lm.044784.116] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 04/21/2017] [Indexed: 12/12/2022]
Abstract
Previous in vivo electrophysiological studies suggest that the anterior cingulate cortex (ACgx) is an important substrate of novel object recognition (NOR) memory. However, intervention studies are needed to confirm this conclusion and permanent lesion studies cannot distinguish effects on encoding and retrieval. The interval between encoding and retrieval tests may also be a critical determinant of the role of the ACgx. The current series of experiments used micro-infusion of the GABAA receptor agonist, muscimol, into ACgx to reversibly inactivate the area and distinguish its role in encoding and retrieval. ACgx infusions of muscimol, before encoding did not alter NOR assessed after a delay of 20 min or 24 h. However, when infused into the ACgx before retrieval muscimol impaired NOR assessed after a delay of 24 h, but not after a 20-min retention test. Together these findings suggest that the ACgx plays a time-dependent role in the retrieval, but not the encoding, of NOR memory, neuronal activation being required for the retrieval of remote (24 h old), but not recent (20 min old) visual memory.
Collapse
Affiliation(s)
- Marie A Pezze
- School of Psychology, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Hayley J Marshall
- School of Life Sciences, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Kevin Cf Fone
- School of Life Sciences, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Helen J Cassaday
- School of Psychology, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| |
Collapse
|
15
|
Nelson AJD, Vann SD. The importance of mammillary body efferents for recency memory: towards a better understanding of diencephalic amnesia. Brain Struct Funct 2016; 222:2143-2156. [PMID: 27783220 PMCID: PMC5504269 DOI: 10.1007/s00429-016-1330-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 10/19/2016] [Indexed: 11/27/2022]
Abstract
Despite being historically one of the first brain regions linked to memory loss, there remains controversy over the core features of diencephalic amnesia as well as the critical site for amnesia to occur. The mammillary bodies and thalamus appear to be the primary locus of pathology in the cases of diencephalic amnesia, but the picture is complicated by the lack of patients with circumscribed damage. Impaired temporal memory is a consistent neuropsychological finding in Korsakoff syndrome patients, but again, it is unclear whether this deficit is attributable to pathology within the diencephalon or concomitant frontal lobe dysfunction. To address these issues, we used an animal model of diencephalic amnesia and examined the effect of mammillothalamic tract lesions on tests of recency memory. The mammillothalamic tract lesions severely disrupted recency judgements involving multiple items but left intact both recency and familiarity judgements for single items. Subsequently, we used disconnection procedures to assess whether this deficit reflects the indirect involvement of the prefrontal cortex. Crossed-lesion rats, with unilateral lesions of the mammillothalamic tract and medial prefrontal cortex in contralateral hemispheres, were unimpaired on the same recency tests. These results provide the first evidence for the selective importance of mammillary body efferents for recency memory. Moreover, this contribution to recency memory is independent of the prefrontal cortex. More broadly, these findings identify how specific diencephalic structures are vital for key elements of event memory.
Collapse
Affiliation(s)
- Andrew J D Nelson
- School of Psychology, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK.
| | - Seralynne D Vann
- School of Psychology, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK
| |
Collapse
|
16
|
Lee YA, Kim YJ, Goto Y. Cognitive and affective alterations by prenatal and postnatal stress interaction. Physiol Behav 2016; 165:146-53. [DOI: 10.1016/j.physbeh.2016.07.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 07/08/2016] [Accepted: 07/18/2016] [Indexed: 01/20/2023]
|
17
|
Pezze MA, Marshall HJ, Fone KCF, Cassaday HJ. Dopamine D1 receptor stimulation modulates the formation and retrieval of novel object recognition memory: Role of the prelimbic cortex. Eur Neuropsychopharmacol 2015; 25:2145-56. [PMID: 26277743 PMCID: PMC4661036 DOI: 10.1016/j.euroneuro.2015.07.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 03/25/2015] [Accepted: 07/24/2015] [Indexed: 11/17/2022]
Abstract
Previous studies have shown that dopamine D1 receptor antagonists impair novel object recognition memory but the effects of dopamine D1 receptor stimulation remain to be determined. This study investigated the effects of the selective dopamine D1 receptor agonist SKF81297 on acquisition and retrieval in the novel object recognition task in male Wistar rats. SKF81297 (0.4 and 0.8 mg/kg s.c.) given 15 min before the sampling phase impaired novel object recognition evaluated 10 min or 24 h later. The same treatments also reduced novel object recognition memory tested 24 h after the sampling phase and when given 15 min before the choice session. These data indicate that D1 receptor stimulation modulates both the encoding and retrieval of object recognition memory. Microinfusion of SKF81297 (0.025 or 0.05 μg/side) into the prelimbic sub-region of the medial prefrontal cortex (mPFC) in this case 10 min before the sampling phase also impaired novel object recognition memory, suggesting that the mPFC is one important site mediating the effects of D1 receptor stimulation on visual recognition memory.
Collapse
Affiliation(s)
- Marie A Pezze
- School of Psychology, University of Nottingham, Nottingham, UK.
| | | | - Kevin C F Fone
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | | |
Collapse
|
18
|
Ganguly P, Holland FH, Brenhouse HC. Functional Uncoupling NMDAR NR2A Subunit from PSD-95 in the Prefrontal Cortex: Effects on Behavioral Dysfunction and Parvalbumin Loss after Early-Life Stress. Neuropsychopharmacology 2015; 40:2666-75. [PMID: 25953359 PMCID: PMC4864660 DOI: 10.1038/npp.2015.134] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 03/30/2015] [Accepted: 04/13/2015] [Indexed: 11/09/2022]
Abstract
Exposure to early-life stress increases vulnerability to psychiatric disorders, including depression, schizophrenia, and anxiety. Growing evidence implicates aberrant development of the prefrontal cortex (PFC) in the effects of early-life stress, which often emerge in adolescence or young adulthood. Specifically, early-life stress in the form of maternal separation (MS) in rodents has been shown to decrease parvalbumin (PVB)-positive interneurons in the adolescent PFC; however, the mechanism underpinning behavioral dysfunction and PVB loss is not yet known. We recently reported that MS causes overexpression of the NMDA subunit NR2A in the PFC of adolescent rats. Elevated PFC NR2A is also found in developmental models of schizophrenia and is correlated with behavioral deficits, acting largely through its association with the postsynaptic protein PSD-95. In addition, adolescent maturation of PVB-positive interneurons relies on NR2A-driven NMDA activity. Therefore, it is possible that the NR2A/PSD-95 signaling complex has a role in adolescent MS effects. Here, we aimed to determine whether a discrete manipulation of PFC NR2A could prevent MS effects on PFC-controlled behaviors, including cognition, anxiety, and novelty-induced hyperlocomotion, as well as PVB loss in adolescence. We intracranially infused the NR2A-specific blocking peptide TAT2A in order to uncouple NR2A from PSD-95 in the early-adolescent PFC, without antagonizing the NMDA receptor. We demonstrated that MS rats treated with TAT2A during early adolescence were protected from MS-induced PVB loss and exhibited less anxious behavior than those infused with control peptide. These data implicate NR2A-related N-methyl-D-aspartate receptor development in adolescent behavioral and neural consequences of early-life stress.
Collapse
Affiliation(s)
- Prabarna Ganguly
- Department of Psychology, Northeastern University, Boston, MA, USA
| | | | - Heather C Brenhouse
- Department of Psychology, Northeastern University, Boston, MA, USA,Department of Psychology, Northeastern University, 125 NI, Boston, MA 02115, USA, Tel: +1 617 373 6856, Fax: +1 617 373 8714, E-mail:
| |
Collapse
|
19
|
Kugelman T, Zuloaga DG, Weber S, Raber J. Post-training gamma irradiation-enhanced contextual fear memory associated with reduced neuronal activation of the infralimbic cortex. Behav Brain Res 2015; 298:1-11. [PMID: 26522840 DOI: 10.1016/j.bbr.2015.10.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 10/21/2015] [Accepted: 10/25/2015] [Indexed: 01/07/2023]
Abstract
The brain might be exposed to irradiation under a variety of situations, including clinical treatments, nuclear accidents, dirty bomb scenarios, and military and space missions. Correctly recalling tasks learned prior to irradiation is important but little is known about post-learning effects of irradiation. It is not clear whether exposure to X-ray irradiation during memory consolidation, a few hours following training, is associated with altered contextual fear conditioning 24h after irradiation and which brain region(s) might be involved in these effects. Brain immunoreactivity patterns of the immediately early gene c-Fos, a marker of cellular activity was used to determine which brain areas might be altered in post-training irradiation memory retention tasks. In this study, we show that post-training gamma irradiation exposure (1 Gy) enhanced contextual fear memory 24h later and is associated with reduced cellular activation in the infralimbic cortex. Reduced GABA-ergic neurotransmission in parvalbumin-positive cells in the infralimbic cortex might play a role in this post-training radiation-enhanced contextual fear memory.
Collapse
Affiliation(s)
- Tara Kugelman
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR 97239, USA
| | - Damian G Zuloaga
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR 97239, USA
| | - Sydney Weber
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR 97239, USA
| | - Jacob Raber
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR 97239, USA; Oregon Health and Science University, Portland, OR 97239, USA; Division of Neuroscience, ONPRC, Oregon Health and Science University, Portland, OR 97239, USA.
| |
Collapse
|
20
|
Medial prefrontal cortex role in recognition memory in rodents. Behav Brain Res 2015; 292:241-51. [DOI: 10.1016/j.bbr.2015.06.030] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 06/17/2015] [Accepted: 06/19/2015] [Indexed: 11/18/2022]
|
21
|
Vieira PA, Korzus E. CBP-Dependent memory consolidation in the prefrontal cortex supports object-location learning. Hippocampus 2015; 25:1532-40. [PMID: 25941038 DOI: 10.1002/hipo.22473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/24/2015] [Indexed: 01/12/2023]
Abstract
Recognition of an object's location in space is supported by hippocampus-dependent recollection. Converging evidence strongly suggests that the interplay between the prefrontal cortex and hippocampus is critical for spatial memory. Lesion, pharmacological, and genetic studies have been successful in dissecting the role of plasticity in the hippocampal circuit in a variety of neural processes relevant to spatial memory, including memory for the location of objects. However, prefrontal mechanisms underlying spatial memory are less well understood. Here, we show that an acute hypofunction of the cyclic-AMP regulatory element binding protein (CREB) Binding Protein (CBP) histone acetyltransferase (HAT) in the medial prefrontal cortex (mPFC) results in delay-dependent disruption of object-location memory. These data suggest that mechanisms involving CBP HAT-mediated lysine acetylation of nuclear proteins support selectively long-term encoding in the mPFC circuits. Evidence from the object-location task suggests that long-term memory encoding within the mPFC complements hippocampus-dependent spatial memory mechanisms and may be critical for broader network integration of information necessary for an assessment of subtle spatial differences to guide appropriate behavioral response during retrieval of spatial memories.
Collapse
Affiliation(s)
- Philip A Vieira
- Department of Psychology & Neuroscience Program, University of California Riverside, California
| | - Edward Korzus
- Department of Psychology & Neuroscience Program, University of California Riverside, California
| |
Collapse
|
22
|
Orbitofrontal or accumbens dopamine depletion does not affect risk-based decision making in rats. COGNITIVE AFFECTIVE & BEHAVIORAL NEUROSCIENCE 2015; 15:507-22. [DOI: 10.3758/s13415-015-0353-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
23
|
Tam SKE, Bonardi C, Robinson J. Relative recency influences object-in-context memory. Behav Brain Res 2015; 281:250-7. [PMID: 25546721 PMCID: PMC4318627 DOI: 10.1016/j.bbr.2014.12.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 12/05/2014] [Accepted: 12/09/2014] [Indexed: 01/07/2023]
Abstract
In two experiments rats received training on an object-in-context (OIC) task, in which they received preexposure to object A in context x, followed by exposure to object B in context y. In a subsequent test both A and B are presented in either context x or context y. Usually more exploration is seen of the object that has not previously been paired with the test context, an effect attributed to the ability to remember where an object was encountered. However, in the typical version of this task, object A has also been encountered less recently than object B at test. This is precisely the arrangement in tests of 'relatively recency' (RR), in which more remotely presented objects are explored more than objects experienced more recently. RR could contaminate performance on the OIC task, by enhancing the OIC effect when animals are tested in context y, and masking it when the test is in context x. This possibility was examined in two experiments, and evidence for superior performance in context y was obtained. The implications of this for theoretical interpretations of recognition memory and the procedures used to explore it are discussed.
Collapse
Affiliation(s)
- Shu K E Tam
- School of Psychology, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
| | - Charlotte Bonardi
- School of Psychology, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
| | - Jasper Robinson
- School of Psychology, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
| |
Collapse
|
24
|
Savalli G, Bashir ZI, Warburton EC. Regionally selective requirement for D1/D5 dopaminergic neurotransmission in the medial prefrontal cortex in object-in-place associative recognition memory. ACTA ACUST UNITED AC 2015; 22:69-73. [PMID: 25593292 PMCID: PMC4341361 DOI: 10.1101/lm.036921.114] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Object-in-place (OiP) memory is critical for remembering the location in which an object was last encountered and depends conjointly on the medial prefrontal cortex, perirhinal cortex, and hippocampus. Here we examined the role of dopamine D1/D5 receptor neurotransmission within these brain regions for OiP memory. Bilateral infusion of D1/D5 receptor antagonists SCH23390 or SKF83566 into the medial prefrontal cortex, prior to memory acquisition, impaired OiP performance following a 5 min or 1 h delay. Retrieval was unaffected. Intraperirhinal or intrahippocampal infusions of SCH23390 had no effect. These results reveal a selective role for D1/D5 receptors in the mPFC during OiP memory encoding.
Collapse
Affiliation(s)
- Giorgia Savalli
- Departments of Neurophysiology and Neuropharmacology, Medical University of Vienna, 1090 Vienna, Austria
| | - Zafar I Bashir
- Department of Physiology and Pharmacology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - E Clea Warburton
- Department of Physiology and Pharmacology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, United Kingdom
| |
Collapse
|
25
|
Thur KE, Nelson AJD, Cassaday HJ. Ro 04-6790-induced cognitive enhancement: no effect in trace conditioning and novel object recognition procedures in adult male Wistar rats. Pharmacol Biochem Behav 2014; 127:42-8. [PMID: 25450117 PMCID: PMC4258611 DOI: 10.1016/j.pbb.2014.10.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 10/10/2014] [Accepted: 10/19/2014] [Indexed: 12/05/2022]
Abstract
The evidence for cognitively enhancing effects of 5-hydroxytryptamine6 (5-HT6) receptor antagonists such as Ro 04-6790 is inconsistent and seems to depend on the behavioral test variant in use. Trace conditioning holds promise as a behavioral assay for hippocampus-dependent working memory function. Accordingly, Experiment 1 assessed the effect of Ro 04-6790 (5 and 10mg/kg i.p.) on associating a noise conditioned stimulus paired with foot shock (unconditioned stimulus) at a 3 or 30s trace interval in adult male Wistar rats. Contextual conditioning was measured as suppression to the contextual cues provided by the experimental chambers and as suppression to a temporally extended light background stimulus which provided an experimental context. Experiment 2 assessed the effect of Ro 04-6790 (5 and 10mg/kg i.p.) on recognition memory as tested by the exploration of novel relative to familiar objects in an open arena. In Experiment 1, Ro 04-6790 (5 and 10mg/kg) was without effect on trace and contextual conditioning. In Experiment 2, there was no indication of the expected improvement under Ro 04-6790 at the same doses previously found to enhance recognition memory as measured in tests of novel object exploration. Thus, there was no evidence that treatment with the 5-HT6 receptor antagonist Ro 04-6790 acted as a cognitive enhancer in either trace conditioning or object recognition procedures. We cannot exclude the possibility that the experimental procedures used in the present study would have been sensitive to the cognitive enhancing effects of Ro 04-6790 in a different dose range, behavioral test variant, or in a different strain of rat. Nonetheless the drug treatment was not ineffective in that object exploration was reduced under 10mg/kg Ro 04-6790.
Collapse
Affiliation(s)
- K E Thur
- School of Psychology, University of Nottingham, Nottingham, UK
| | - A J D Nelson
- School of Psychology, University of Nottingham, Nottingham, UK
| | - H J Cassaday
- School of Psychology, University of Nottingham, Nottingham, UK.
| |
Collapse
|
26
|
An associative analysis of object memory. Behav Brain Res 2014; 285:1-9. [PMID: 25446743 DOI: 10.1016/j.bbr.2014.10.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 10/27/2014] [Accepted: 10/29/2014] [Indexed: 11/22/2022]
Abstract
Different aspects of recognition memory in rodents are commonly assessed using variants of the spontaneous object recognition procedure in which animals explore objects that differ in terms of their novelty, recency, or where they have previously been presented. The present article describes three standard variants of this procedure, and outlines a theory of associative learning, SOP which can offer an explanation of performance on all three types of task. The implications of this for theoretical interpretations of recognition memory and the procedures used to explore it are discussed.
Collapse
|
27
|
Cassaday HJ, Nelson AJD, Pezze MA. From attention to memory along the dorsal-ventral axis of the medial prefrontal cortex: some methodological considerations. Front Syst Neurosci 2014; 8:160. [PMID: 25249948 PMCID: PMC4157611 DOI: 10.3389/fnsys.2014.00160] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 08/15/2014] [Indexed: 12/16/2022] Open
Abstract
Distinctions along the dorsal-ventral axis of medial prefrontal cortex (mPFC), between anterior cingulate (AC), prelimbic (PL), and infralimbic (IL) sub-regions, have been proposed on a variety of neuroanatomical and neurophysiological grounds. Conventional lesion approaches (as well as some electrophysiological studies) have shown that these distinctions relate to function in that a number behavioral dissociations have been demonstrated, particularly using rodent models of attention, learning, and memory. For example, there is evidence to suggest that AC has a relatively greater role in attention, whereas IL is more involved in executive function. However, the well-established methods of behavioral neuroscience have the limitation that neuromodulation is not addressed. The neurotoxin 6-hydroxydopamine has been used to deplete dopamine (DA) in mPFC sub-regions, but these lesions are not selective anatomically and noradrenalin is typically also depleted. Microinfusion of drugs through indwelling cannulae provides an alternative approach, to address the role of neuromodulation and moreover that of specific receptor subtypes within mPFC sub-regions, but the effects of such treatments cannot be assumed to be anatomically restricted either. New methodological approaches to the functional delineation of the role of mPFC in attention, learning and memory will also be considered. Taken in isolation, the conventional lesion methods which have been a first line of approach may suggest that a particular mPFC sub-region is not necessary for a particular aspect of function. However, this does not exclude a neuromodulatory role and more neuropsychopharmacological approaches are needed to explain some of the apparent inconsistencies in the results.
Collapse
Affiliation(s)
| | - Andrew J D Nelson
- School of Psychology, University of Nottingham Nottingham, UK ; School of Psychology, Cardiff University Cardiff, UK
| | - Marie A Pezze
- School of Psychology, University of Nottingham Nottingham, UK
| |
Collapse
|
28
|
Shnitko TA, Robinson DL. Anatomical and pharmacological characterization of catecholamine transients in the medial prefrontal cortex evoked by ventral tegmental area stimulation. Synapse 2014; 68:131-43. [PMID: 24285555 PMCID: PMC4060446 DOI: 10.1002/syn.21723] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 08/30/2013] [Accepted: 10/11/2013] [Indexed: 02/03/2023]
Abstract
Voltammetric measurements of catecholamines in the medial prefrontal cortex (mPFC) are infrequent because of lack of chemical selectivity between dopamine and norepinephrine and their overlapping anatomical inputs. Here, we examined the contribution of norepinephrine to the catecholamine release in the mPFC evoked by electrical stimulation of the ventral tegmental area (VTA). Initially, electrical stimulation was delivered in the midbrain at incremental depths of -5 to -9.4 mm from bregma while catecholamine release was monitored in the mPFC. Although catecholamine release was observed at dorsal stimulation sites that may correspond to the dorsal noradrenergic bundle (DNB, containing noradrenergic axonal projections to the mPFC), maximal release was evoked by stimulation of the VTA (the source of dopaminergic input to the mPFC). Next, VTA-evoked catecholamine release was monitored in the mPFC before and after knife incision of the DNB, and no significant changes in the evoked catecholamine signals were found. These data indicated that DNB fibers did not contribute to the VTA-evoked catecholamine release observed in the mPFC. Finally, while the D2-receptor antagonist raclopride significantly altered VTA-evoked catecholamine release, the α₂-adrenergic receptor antagonist idazoxan did not. Specifically, raclopride reduced catecholamine release in the mPFC, opposite to that observed in the striatum, indicating differential autoreceptor regulation of mesocortical and mesostriatal neurons. Together, these findings suggest that the catecholamine release in the mPFC arising from VTA stimulation was predominately dopaminergic rather than noradrenergic.
Collapse
Affiliation(s)
- Tatiana A. Shnitko
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA
| | - Donita L. Robinson
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA
| |
Collapse
|
29
|
Rossato JI, Radiske A, Kohler CA, Gonzalez C, Bevilaqua LR, Medina JH, Cammarota M. Consolidation of object recognition memory requires simultaneous activation of dopamine D1/D5 receptors in the amygdala and medial prefrontal cortex but not in the hippocampus. Neurobiol Learn Mem 2013; 106:66-70. [PMID: 23891712 DOI: 10.1016/j.nlm.2013.07.012] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 06/26/2013] [Accepted: 07/12/2013] [Indexed: 02/07/2023]
Abstract
The mesocorticolimbic dopaminergic system includes the ventral tegmental area (VTA) and its projections to the amygdala (AMY), the hippocampus (HIP) and the medial prefrontal cortex (mPFC), among others. Object recognition (OR) long-term memory (LTM) processing requires dopaminergic activity but, although some of the brain regions mentioned above are necessary for OR LTM consolidation, their possible dopamine-mediated interplay remains to be analyzed. Using adult male Wistar rats, we found that posttraining microinjection of the dopamine D1/D5 receptor antagonist SCH23390 in mPFC or AMY, but not in HIP, impaired OR LTM. The dopamine D2 receptor agonist quinpirole had no effect on retention. VTA inactivation also hindered OR LTM, and even though this effect was unaffected by co-infusion of the dopamine D1/D5 receptor agonist SKF38393 in HIP, mPFC or AMY alone, it was reversed by simultaneous activation of D1/D5 receptors in the last two regions. Our results demonstrate that the mesocorticolimbic dopaminergic system is indeed essential for OR LTM consolidation and suggest that the role played by some of its components during this process is much more complex than previously thought.
Collapse
Affiliation(s)
- Janine I Rossato
- Memory Research Laboratory, Brain Institute (ICe), Federal University of Rio Grande do Norte (UFRN), Natal, RN 59056-450, Brazil; Laboratory of Behavioral Neurobiology, Biomedical Research Institute, Porto Alegre, RS 90610-000, Brazil
| | | | | | | | | | | | | |
Collapse
|
30
|
Renard J, Krebs MO, Jay TM, Le Pen G. Long-term cognitive impairments induced by chronic cannabinoid exposure during adolescence in rats: a strain comparison. Psychopharmacology (Berl) 2013; 225:781-90. [PMID: 22983145 DOI: 10.1007/s00213-012-2865-z] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 08/28/2012] [Indexed: 12/15/2022]
Abstract
RATIONALE During cerebral development, adolescence is a critical phase in which the endocannabinoid system plays an important role in regulating various neurotransmitters. Moreover, evidence from both human and animal studies suggests that chronic cannabinoid exposure during this vulnerable period can induce persistent brain and behavioural alterations. OBJECTIVES The aim of this study was to compare the long-term cognitive consequences of chronic adolescence cannabinoid exposure between Lister Hooded rats and Wistar rats. METHODS Rats of both strains were injected daily throughout their adolescent or adult periods with vehicle or with incremental doses of the synthetic cannabinoid CB1 receptor agonist CP55,940 (CP). Short-term and spatial working memories were assessed using the object recognition and object location, tasks respectively. For both tasks, the effect of a 30- or 120-min delay between the learning and the testing phase was investigated. RESULTS In the object recognition task, adolescent CP exposure impaired short-term memory after both delays in both strains. In contrast, in the object location task, adolescent CP exposure impaired spatial working memory in the Wistar rats after a 30-min delay, whereas the Lister Hooded rats exhibited a similar effect only after a 120-min delay. In these tests, no long-term deleterious effects were found following adult CP exposure in either strain. CONCLUSIONS Our results confirm that adolescence is a critical period for the deleterious effects of cannabinoids on cognition and that these deleterious effects on spatial working memory are more strain-dependent than the effects observed on short-term memory.
Collapse
Affiliation(s)
- Justine Renard
- Laboratoire de "Physiopathologie des maladies Psychiatriques", Centre de Psychiatrie et Neurosciences U894, INSERM, Paris, France
| | | | | | | |
Collapse
|
31
|
Braszko JJ, Wincewicz D, Jakubów P. Candesartan prevents impairment of recall caused by repeated stress in rats. Psychopharmacology (Berl) 2013; 225:421-8. [PMID: 22890474 PMCID: PMC3537078 DOI: 10.1007/s00213-012-2829-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Accepted: 07/26/2012] [Indexed: 01/04/2023]
Abstract
RATIONALE Deleterious effects of psychological stress on memory are increasingly important. Overexpression of the AT(1) angiotensin receptors in brain has been found to participate in several negative effects of chronic stress including hypertension and a cognitive impairment. OBJECTIVE In this study, we searched for the protective effects the AT(1) angiotensin receptor blockade with candesartan against the adverse effects of repeated stress on recall of aversively and appetitively motivated behaviours in rats. METHODS Two groups of male Wistar rats were repeatedly stressed by keeping them daily (2 h/21 days) in tight plastic tubes. The subjects of the group 1 received candesartan (0.1 mg/kg, orally) each day before the stressing procedure. The rats of the group 2 received vehicle. Another two groups of rats (3 and 4) receiving candesartan and vehicle, respectively, were appropriately handled but not stressed. Next day, after ending the repeated stress procedure, all rats were tested in two cognitive paradigms: inhibitory avoidance (IA) and object recognition (OR). RESULTS Stressed animals displayed decreased recall of the IA behaviour (p < 0.01) and decreased OR (p < 0.05). These effects were not seen in the animals stressed and concomitantly treated with candesartan. The auxiliary tests designed to control for the possible unspecific contribution of motor (open field) and emotional (elevated "plus" maze) effects of the experimental procedures to results of the cognitive tests showed no such contribution. CONCLUSION These data strongly suggest that the AT(1) angiotensin receptor blockade effectively counteracts deleterious effects of stress on recall of aversively and appetitively motivated memories in rats.
Collapse
Affiliation(s)
- Jan Józef Braszko
- Department of Clinical Pharmacology, Medical University of Bialystok, Waszyngtona 15a, 15-274 Bialystok, Poland.
| | - Dominik Wincewicz
- Department of Clinical Pharmacology, Medical University of Bialystok, Waszyngtona 15a, 15-274 Bialystok, Poland
| | - Piotr Jakubów
- Department of Clinical Pharmacology, Medical University of Bialystok, Waszyngtona 15a, 15-274 Bialystok, Poland
| |
Collapse
|
32
|
Reichel CM, Ramsey LA, Schwendt M, McGinty JF, See RE. Methamphetamine-induced changes in the object recognition memory circuit. Neuropharmacology 2011; 62:1119-26. [PMID: 22115899 DOI: 10.1016/j.neuropharm.2011.11.003] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Revised: 11/02/2011] [Accepted: 11/06/2011] [Indexed: 11/19/2022]
Abstract
Chronic methamphetamine (meth) can lead to persisting cognitive deficits in human addicts and animal models of meth addiction. Here, we examined the impact of either contingent or non-contingent meth on memory performance using an object-in-place (OIP) task, which measures the ability to detect an object relative to its location and surrounding objects. Further, we quantified monoamine transporter levels and markers of neurotoxicity within the OIP circuitry and striatum. Male Long-Evans rats received an acute meth binge (4 × 4 mg/kg i.p., 2 h intervals) or self-administered meth (0.02 mg/infusion, i.v.; 7 days for 1 h/day, followed by 14 days for 6 h/day). Rats were tested for OIP recognition memory following one week of withdrawal. Subsequently, transporters for serotonin (SERT) and norepinephrine (NET) were quantified using Western blot in tissue obtained from the hippocampus, perirhinal cortex, and prefrontal cortex. In addition, striatal dopamine transporters, tyrosine hydroxylase, and glial fibrillary acidic protein were measured to assess potential neurotoxicity. Control (saline-treated) rats spent more time interacting with the objects in the changed locations. In contrast, contingent or non-contingent meth resulted in disrupted OIP performance as seen by similar amounts of time spent with all objects, regardless of location. While only acute meth binge produced signs of neurotoxicity, both meth regimens decreased SERT in the perirhinal cortex and hippocampus. Only meth self-administration resulted in a selective decrease in NET. Meth-induced changes in SERT function in the OIP circuitry may underlie memory deficits independently of overt neurotoxic effects. This article is part of a Special Issue entitled 'Post-Traumatic Stress Disorder'.
Collapse
Affiliation(s)
- Carmela M Reichel
- Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | | | | | | | | |
Collapse
|
33
|
de Oliveira J, Hort MA, Moreira ELG, Glaser V, Ribeiro-do-Valle RM, Prediger RD, Farina M, Latini A, de Bem AF. Positive correlation between elevated plasma cholesterol levels and cognitive impairments in LDL receptor knockout mice: relevance of cortico-cerebral mitochondrial dysfunction and oxidative stress. Neuroscience 2011; 197:99-106. [PMID: 21945034 DOI: 10.1016/j.neuroscience.2011.09.009] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Revised: 08/23/2011] [Accepted: 09/05/2011] [Indexed: 11/30/2022]
Abstract
Convergent epidemiological, clinical, and experimental findings indicate that hypercholesterolemia contributes to the onset of Alzheimer's disease (AD)-like dementia, but the exact underlying mechanisms remains unknown. In this study, we evaluated the cognitive performance of mice submitted to a model of hypercholesterolemia, as well as its relationship with mitochondrial dysfunction and oxidative stress, two key events involved in AD pathogenesis. Wild-type C57bl/6 or low density lipoprotein receptor (LDLr)-deficient mice were fed with either standard or cholesterol-enriched diet for a 4-week period and tested for spatial learning and memory in the object location task. LDLr⁻/⁻ mice displayed spatial learning and memory impairments regardless of diet. Moreover, LDLr⁻/⁻ mice fed cholesterol-enriched diet presented a significant decrease in the mitochondrial complexes I and II activities in the cerebral cortex, which were negatively correlated with respective blood cholesterol levels. Additionally, hypercholesterolemic LDLr⁻/⁻ mice presented a significant decrease in glutathione levels, about 40% increase in the thiobarbituric acid-reactive substances levels, as well as an imbalance between the peroxide-removing-related enzymes glutathione peroxidase/glutathione reductase activities in the cerebral cortex. These findings indicate a significant relationship between hypercholesterolemia, cognitive impairment, and cortico-cerebral mitochondrial dysfunctional/oxidative stress. Because of the involvement of such alterations in AD patients, our data render this mouse model of hypercholesterolemia a useful approach to comprehend the molecular events mediating AD pathogenesis.
Collapse
Affiliation(s)
- J de Oliveira
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | | | | | | | | | | | | | | | | |
Collapse
|