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Milczarek MM, Perry JC, Amin E, Haniffa S, Hathaway T, Vann SD. Impairments in the early consolidation of spatial memories via group II mGluR agonism in the mammillary bodies. Sci Rep 2024; 14:5977. [PMID: 38472268 PMCID: PMC10933409 DOI: 10.1038/s41598-024-56015-3] [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: 12/13/2023] [Accepted: 02/29/2024] [Indexed: 03/14/2024] Open
Abstract
mGluR2 receptors are widely expressed in limbic brain regions associated with memory, including the hippocampal formation, retrosplenial and frontal cortices, as well as subcortical regions including the mammillary bodies. mGluR2/3 agonists have been proposed as potential therapeutics for neurological and psychiatric disorders, however, there is still little known about the role of these receptors in cognitive processes, including memory consolidation. To address this, we assessed the effect of the mGluR2/3 agonist, eglumetad, on spatial memory consolidation in both mice and rats. Using the novel place preference paradigm, we found that post-sample injections of eglumetad impaired subsequent spatial discrimination when tested 6 h later. Using the immediate early gene c-fos as a marker of neural activity, we showed that eglumetad injections reduced activity in a network of limbic brain regions including the hippocampus and mammillary bodies. To determine whether the systemic effects could be replicated with more targeted manipulations, we performed post-sample infusions of the mGluR2/3 agonist 2R,4R-APDC into the mammillary bodies. This impaired novelty discrimination on a place preference task and an object-in-place task, again highlighting the role of mGluR2/3 transmission in memory consolidation and demonstrating the crucial involvement of the mammillary bodies in post-encoding processing of spatial information.
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Affiliation(s)
- Michal M Milczarek
- School of Psychology & Neuroscience and Mental Health Innovation Institute, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK
| | - James C Perry
- School of Psychology & Neuroscience and Mental Health Innovation Institute, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK
| | - Eman Amin
- School of Psychology & Neuroscience and Mental Health Innovation Institute, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK
| | - Salma Haniffa
- School of Psychology & Neuroscience and Mental Health Innovation Institute, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK
| | - Thomas Hathaway
- School of Psychology & Neuroscience and Mental Health Innovation Institute, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK
| | - Seralynne D Vann
- School of Psychology & Neuroscience and Mental Health Innovation Institute, Cardiff University, 70 Park Place, Cardiff, CF10 3AT, UK.
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Neurobehavioral basis of Maier 3-table and other matching-to-place tasks. COGNITIVE, AFFECTIVE, & BEHAVIORAL NEUROSCIENCE 2022; 23:237-247. [PMID: 36451026 DOI: 10.3758/s13415-022-01049-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/10/2022] [Indexed: 12/03/2022]
Abstract
The Maier 3-table task comprises three phases conducted each day. During the exploration phase, rats explore the entire apparatus. During the information phase, the rats are placed on one of the three tables where food is found. During the test phase, the animals are placed at the starting point on one of the two remaining tables and must enter the goal table where they previously ate. The acquisition of the Maier 3-table task was slowed down after lesions of the septum, fornix, hippocampus, medial prefrontal cortex, or posterior parietal cortex. Because of its time-consuming nature, the Maier 3-table task has more recently been superseded by appetitive matching-to-place in Y- or T-mazes or the circular water maze, because experimenters skip over the exploration phase. Nevertheless, like the Maier 3-table task, the acquisition of the Y- or T-maze matching-to-place task was retarded after lesions of the medial septum or medial prefrontal cortex, more particularly its prelimbic-infralimbic part. Like the previous task, the water-maze version is sensitive to lesions of the medial septum or retrosplenial cortex. Despite methodological differences between the three procedures, these results indicate common neurobiological bases of matching-to-place learning.
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Kasza Á, Hunya Á, Frank Z, Fülöp F, Török Z, Balogh G, Sántha M, Bálind Á, Bernáth S, Blundell KLIM, Prodromou C, Horváth I, Zeiler HJ, Hooper PL, Vigh L, Penke B. Dihydropyridine Derivatives Modulate Heat Shock Responses and have a Neuroprotective Effect in a Transgenic Mouse Model of Alzheimer's Disease. J Alzheimers Dis 2018; 53:557-71. [PMID: 27163800 PMCID: PMC4969717 DOI: 10.3233/jad-150860] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Heat shock proteins (Hsps) have chaperone activity and play a pivotal role in the homeostasis of proteins by preventing misfolding, by clearing aggregated and damaged proteins from cells, and by maintaining proteins in an active state. Alzheimer’s disease (AD) is thought to be caused by amyloid-β peptide that triggers tau hyperphosphorylation, which is neurotoxic. Although proteostasis capacity declines with age and facilitates the manifestation of neurodegenerative diseases such as AD, the upregulation of chaperones improves prognosis. Our research goal is to identify potent Hsp co-inducers that enhance protein homeostasis for the treatment of AD, especially 1,4-dihydropyridine derivatives optimized for their ability to modulate cellular stress responses. Based on favorable toxicological data and Hsp co-inducing activity, LA1011 was selected for the in vivo analysis of its neuroprotective effect in the APPxPS1 mouse model of AD. Here, we report that 6 months of LA1011 administration effectively improved the spatial learning and memory functions in wild type mice and eliminated neurodegeneration in double mutant mice. Furthermore, Hsp co-inducer therapy preserves the number of neurons, increases dendritic spine density, and reduces tau pathology and amyloid plaque formation in transgenic AD mice. In conclusion, the Hsp co-inducer LA1011 is neuroprotective and therefore is a potential pharmaceutical candidate for the therapy of neurodegenerative diseases, particularly AD.
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Affiliation(s)
- Ágnes Kasza
- Department of Medical Chemistry, University of Szeged, Hungary
| | - Ákos Hunya
- LipidArt Research and Development Ltd., Szeged, Hungary
| | - Zsuzsa Frank
- Department of Medical Chemistry, University of Szeged, Hungary
| | - Ferenc Fülöp
- Department of Pharmaceutical Chemistry, University of Szeged, Hungary
| | - Zsolt Török
- LipidArt Research and Development Ltd., Szeged, Hungary.,Biological Research Center of HAS, Institute of Biochemistry, Szeged, Hungary
| | - Gábor Balogh
- Biological Research Center of HAS, Institute of Biochemistry, Szeged, Hungary
| | - Miklós Sántha
- Biological Research Center of HAS, Institute of Biochemistry, Szeged, Hungary
| | - Árpád Bálind
- Biological Research Center of HAS, Institute of Biochemistry, Szeged, Hungary
| | | | | | | | - Ibolya Horváth
- Biological Research Center of HAS, Institute of Biochemistry, Szeged, Hungary
| | | | - Philip L Hooper
- Division of Endocrinology, Metabolism and Diabetes, Department of Medicine, University of Colorado Medical School, Anschutz Medical Campus, Aurora, CO, USA
| | - László Vigh
- Biological Research Center of HAS, Institute of Biochemistry, Szeged, Hungary
| | - Botond Penke
- Department of Medical Chemistry, University of Szeged, Hungary
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Kasza Á, Penke B, Frank Z, Bozsó Z, Szegedi V, Hunya Á, Németh K, Kozma G, Fülöp L. Studies for Improving a Rat Model of Alzheimer's Disease: Icv Administration of Well-Characterized β-Amyloid 1-42 Oligomers Induce Dysfunction in Spatial Memory. Molecules 2017; 22:molecules22112007. [PMID: 29156571 PMCID: PMC6150403 DOI: 10.3390/molecules22112007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/07/2017] [Accepted: 11/13/2017] [Indexed: 12/17/2022] Open
Abstract
During the past 15 years, several genetically altered mouse models of human Alzheimer’s disease (AD) have been developed. These costly models have greatly facilitated the evaluation of novel therapeutic approaches. Injecting synthetic β-amyloid (Aβ) 1-42 species into different parts of the brain of non-transgenic rodents frequently provided unreliable results, owing to a lack of a genuine characterization of the administered Aβ aggregates. Previously, we have published a new rat AD-model in which protofibrillar-fibrillar Aβ1-42 was administered into rat entorhinal cortex (Sipos 2007). In order to develop a more reliable model, we have injected well-characterized toxic soluble Aβ1-42 species (oligomers, protofibrils and fibrils) intracerebroventricularly (icv) into rat brain. Studies of the distribution of fluorescent-labeled Aβ1-42 in the brain showed that soluble Aβ-species diffused into all parts of the rat brain. After seven days, the Aβ-treated animals showed a significant decrease of spatial memory in Morris water maze test and impairment of synaptic plasticity (LTP) measured in acute hippocampal slices. The results of histological studies (decreased number of viable neurons, increased tau levels and decreased number of dendritic spines) also supported that icv administration of well-characterized toxic soluble Aβ species into rat brain provides a reliable rat AD-model.
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Affiliation(s)
- Ágnes Kasza
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Botond Penke
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Zsuzsanna Frank
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Zsolt Bozsó
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Viktor Szegedi
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Ákos Hunya
- LipidArt Research and Development Ltd., Temesvári krt. 62, Szeged H-6726, Hungary.
| | - Klaudia Németh
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Gábor Kozma
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla square 1, Szeged H-6720, Hungary.
| | - Lívia Fülöp
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
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