1
|
Mendelski GQ, Furini CRG, Stefani GP, Botton LP, Baptista RR. Enhancing long-term memory through strength training: An experimental study in adult and middle-aged rats. Behav Brain Res 2024; 456:114697. [PMID: 37793439 DOI: 10.1016/j.bbr.2023.114697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 09/09/2023] [Accepted: 09/30/2023] [Indexed: 10/06/2023]
Abstract
The study aimed to explore the impact of strength training on long-term memory in adult and middle-aged rodents, specifically male Wistar rats aged 9 and 20 months. These rats were divided into two groups: one sedentary (SED) and the other trained (ST) for a period of 12 weeks. The strength training involved squatting exercises using adapted equipment, while the sedentary group maintained their regular, non-exercised routine. Behavioral tasks assessing mobility, anxiety, and multiple facets of memory, such as object recognition memory (ORM), social recognition memory (SRM), and object location memory (OLM), were conducted post-training. The findings were promising, revealing a generally beneficial impact of strength training on memory tasks across both age groups. Specifically, the ORM tasks showed facilitated and improved learning in both adult and middle-aged rats that underwent training. In contrast, OLM displayed only a facilitatory effect in both age groups, meaning that while the trained rats learned the task, they did not outperform the sedentary group. For SRM, a facilitatory effect was observed only in the adult group. In addition to the cognitive benefits, strength training was found to have an anxiolytic effect in the 9-month-old rats and positively affected body mass and adipose tissue composition. Notably, the study correlated the strength gains from the training with improved performance in memory tasks. These outcomes provide crucial insights into the potential of exercise-based interventions to bolster cognitive health and mitigate age-related cognitive decline.
Collapse
Affiliation(s)
- Gabriela Quines Mendelski
- Graduate Program in Biomedical Gerontology, School of Medicine, Pontifical Catholic University of Rio Grande do Sul, Brazil
| | - Cristiane Regina Guerino Furini
- Graduate Program in Biomedical Gerontology, School of Medicine, Pontifical Catholic University of Rio Grande do Sul, Brazil; Laboratory of Cognition and Neurobiology of Memory, Brain Institute, Pontifical Catholic University of Rio Grande do Sul, Brazil; Institute of Geriatrics and Gerontology, Pontifical Catholic University of Rio Grande do Sul, Brazil
| | | | | | - Rafael Reimann Baptista
- Graduate Program in Biomedical Gerontology, School of Medicine, Pontifical Catholic University of Rio Grande do Sul, Brazil; Institute of Geriatrics and Gerontology, Pontifical Catholic University of Rio Grande do Sul, Brazil; School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Brazil.
| |
Collapse
|
2
|
Rosa J, de Carvalho Myskiw J, Fiorenza NG, Furini CRG, Sapiras GG, Izquierdo I. Hippocampal cholinergic receptors and the mTOR participation in fear-motivated inhibitory avoidance extinction memory. Behav Brain Res 2023; 437:114129. [PMID: 36179804 DOI: 10.1016/j.bbr.2022.114129] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 09/07/2022] [Accepted: 09/24/2022] [Indexed: 10/14/2022]
Abstract
Evidence has demonstrated the hippocampal cholinergic system and the mammalian target of rapamycin (mTOR) participation during the memory formation of aversive events. This study assessed the role of these systems in the hippocampus for the extinction memory process by submitting male Wistar rats to fear-motivated step-down inhibitory avoidance (IA). The post-extinction session administration of the nicotinic and muscarinic cholinergic receptor antagonists, mecamylamine and scopolamine, respectively, both at doses of 2 µg/µl/side, and rapamycin, an mTOR inhibitor (0.02 µg/µl/side), into the CA1 region of the dorsal hippocampus, impaired the IA extinction memory. Furthermore, the nicotinic and muscarinic cholinergic receptor agonists, nicotine and muscarine, respectively, had a dose-dependent effect on the IA extinction memory when administered intra-CA1, immediately after the extinction session. Nicotine (0.6 µg/µl/side) and muscarine (0.02 µg/µl/side), respectively, had no effect, while the higher doses (6 and 2 µg/µl/side, respectively) impaired the IA extinction memory. Interestingly, the co-administration of muscarine at the lower dose blocked the impairment that was induced by rapamycin. This effect was not observed when nicotine at the lower dose was co-administered. These results have demonstrated the participation of the cholinergic receptors and mTOR in the hippocampus for IA extinction, and that the cholinergic agonists had a dose-dependent effect on the IA extinction memory. This study provides insights related to the behavioural aspects and the neurobiological properties underlying the early stage of fear-motivated IA extinction memory consolidation and suggests that there is hippocampal muscarinic receptor participation independent of mTOR in this memory process.
Collapse
Affiliation(s)
- Jessica Rosa
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, Floor 2, 90610-600 Porto Alegre, RS, Brazil; Department of Pharmacology, School of Medicine of Ribeirao Preto, University of Sao Paulo (USP), Bandeirantes 3900, 14049-900 Ribeirao Preto, SP, Brazil.
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, Floor 2, 90610-600 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil; Department of Biophysics, Institute of Biosciences, Federal University of Rio Grande do Sul (UFRGS), Bento Gonçalves 9500, Building 43422, Room 208 A, 91501-970 Porto Alegre, RS, Brazil
| | - Natalia Gindri Fiorenza
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, Floor 2, 90610-600 Porto Alegre, RS, Brazil; Oswaldo Cruz Foundation (FIOCRUZ), Branch Ceara, 60760-000 Eusebio, CE, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, Floor 2, 90610-600 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil; Laboratory of Cognition and Memory Neurobiology, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, 3rd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Gerson Guilherme Sapiras
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, Floor 2, 90610-600 Porto Alegre, RS, Brazil; Clinical Hospital of Passo Fundo (HCPF), Tiradentes 295, 99010-260 Passo Fundo, RS, Brazil
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Ipiranga 6690, Floor 2, 90610-600 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil
| |
Collapse
|
3
|
Schmidt SD, Zinn CG, Cavalcante LE, Ferreira FF, Furini CRG, Izquierdo I, de Carvalho Myskiw J. Participation of Hippocampal 5-HT 5A, 5-HT 6 and 5-HT 7 Serotonin Receptors on the Consolidation of Social Recognition Memory. Neuroscience 2022; 497:171-183. [PMID: 35718219 DOI: 10.1016/j.neuroscience.2022.06.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 05/31/2022] [Accepted: 06/09/2022] [Indexed: 11/28/2022]
Abstract
Social recognition is the ability of animals to identify and recognize a conspecific. The consolidation of social stimuli in long-term memory is crucial for the establishment and maintenance of social groups, reproduction and species survival. Despite its importance, little is known about the circuitry and molecular mechanisms involved in the social recognition memory (SRM). Serotonin (5-hydroxytryptamine, 5-HT) is acknowledged as a major neuromodulator, which plays a key role in learning and memory. Focusing on the more recently described 5-HT receptors, we investigated in the CA1 region of the dorsal hippocampus the participation of 5-HT5A, 5-HT6 and 5-HT7 receptors in the consolidation of SRM. Male Wistar rats cannulated in CA1 were subjected to a social discrimination task. In the sample phase the animals were exposed to a juvenile conspecific for 1 h. Immediately after, they received different pharmacological treatments. Twenty-four hours later, they were submitted to a 5 min retention test in the presence of the previously presented juvenile (familiar) and a novel juvenile. The animals that received infusions of 5-HT5A receptor antagonist SB-699551 (10 µg/µL), 5-HT6 receptor agonist WAY-208466 (0.63 µg/µL) or 5-HT7 receptor agonist AS-19 (5 µg/µL) intra-CA1 were unable to recognize the familiar juvenile. This effect was blocked by the coinfusion of WAY-208466 plus 5-HT6 receptor antagonist SB-271046 (10 µg/µL) or AS-19 plus 5-HT7 receptor antagonist SB-269970 (5 µg/µL). The present study helps to clarify the neurobiological functions of the 5-HT receptors more recently described and extends our knowledge about mechanisms underlying the SRM.
Collapse
Affiliation(s)
- Scheila Daiane Schmidt
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil.
| | - Carolina Garrido Zinn
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Lorena Evelyn Cavalcante
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Flávia Fagundes Ferreira
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902, Rio de Janeiro, Brazil
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902, Rio de Janeiro, Brazil
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902, Rio de Janeiro, Brazil; Psychobiology and Neurocomputation Laboratory (LPBNC), Department of Biophysics, Institute of Biosciences, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, Building 43422, Room 208A, 91501-970 Porto Alegre, RS, Brazil.
| |
Collapse
|
4
|
Schmidt SD, Zinn CG, Behling JAK, Furian AF, Furini CRG, de Carvalho Myskiw J, Izquierdo I. Inhibition of PACAP/PAC1/VPAC2 signaling impairs the consolidation of social recognition memory and nitric oxide prevents this deficit. Neurobiol Learn Mem 2021; 180:107423. [PMID: 33705861 DOI: 10.1016/j.nlm.2021.107423] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 02/18/2021] [Accepted: 03/03/2021] [Indexed: 11/17/2022]
Abstract
Social recognition memory (SRM) forms the basis of social relationships of animals. It is essential for social interaction and adaptive behavior, reproduction and species survival. Evidence demonstrates that social deficits of psychiatric disorders such as autism and schizophrenia are caused by alterations in SRM processing by the hippocampus and amygdala. Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP) and its receptors PAC1, VPAC1 and VPAC2 are highly expressed in these regions. PACAP is a pleiotropic neuropeptide that modulates synaptic function and plasticity and is thought to be involved in social behavior. PACAP signaling also stimulates the nitric oxide (NO) production and targets outcomes to synapses. In the present work, we investigate the effect of the infusion of PACAP-38 (endogenous neuropeptide and potent stimulator of adenylyl cyclase), PACAP 6-38 (PAC1/VPAC2 receptors antagonist) and S-Nitroso-N-acetyl-DL-penicillamine (SNAP, NO donor) in the CA1 region of the hippocampus and in the basolateral amygdala (BLA) on the consolidation of SRM. For this, male Wistar rats with cannulae implanted in CA1 or in BLA were subjected to a social discrimination paradigm, which is based on the natural ability of rodents to investigate unfamiliar conspecifics more than familiar one. In the sample phase (acquisition), animals were exposed to a juvenile conspecific for 1 h. Immediately, 60 or 150 min after, animals received one of different pharmacological treatments. Twenty-four hours later, they were submitted to a 5 min retention test in the presence of the previously presented juvenile (familiar) and a novel juvenile. Animals that received infusions of PACAP 6-38 (40 pg/side) into CA1 immediately after the sample phase or into BLA immediately or 60 min after the sample phase were unable to recognize the familiar juvenile during the retention test. This impairment was abolished by the coinfusion of PACAP 6-38 plus SNAP (5 μg/side). These results show that the blockade of PACAP/PAC1/VPAC2 signaling in the CA1 and BLA during a restricted post-acquisition time window impairs the consolidation of SRM and that the SNAP is able to abolish this deficit. Findings like this could potentially be used in the future to influence studies of psychiatric disorders involving social behavior.
Collapse
Affiliation(s)
- Scheila Daiane Schmidt
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil.
| | - Carolina Garrido Zinn
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Jonny Anderson Kielbovicz Behling
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Ana Flávia Furian
- Laboratory of Neurotoxicity, Federal University of Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil.
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute of Translational Neuroscience (INNT), National Research Council of Brazil, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil.
| |
Collapse
|
5
|
Marcondes LA, Nachtigall EG, Zanluchi A, de Carvalho Myskiw J, Izquierdo I, Furini CRG. Involvement of medial prefrontal cortex NMDA and AMPA/kainate glutamate receptors in social recognition memory consolidation. Neurobiol Learn Mem 2020; 168:107153. [DOI: 10.1016/j.nlm.2019.107153] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/12/2019] [Accepted: 12/23/2019] [Indexed: 11/28/2022]
|
6
|
de Assis Brasil ES, Guerino Furini CR, da Silva Rodrigues F, Nachtigall EG, Kielbovicz Behling JA, Saenger BF, Farias CP, de Carvalho Myskiw J, Izquierdo I. The blockade of the serotoninergic receptors 5-HT5A, 5-HT6 and 5-HT7 in the basolateral amygdala, but not in the hippocampus facilitate the extinction of fear memory. Behav Brain Res 2019; 372:112055. [DOI: 10.1016/j.bbr.2019.112055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 05/27/2019] [Accepted: 06/20/2019] [Indexed: 01/20/2023]
|
7
|
Medeiros FM, de Carvalho Myskiw J, Baptista PPA, Neves LT, Martins LA, Furini CRG, Izquierdo I, Xavier LL, Hollands K, Mestriner RG. Can an aversive, extinction-resistant memory trigger impairments in walking adaptability? An experimental study using adult rats. Neurosci Lett 2018; 665:224-228. [PMID: 29229398 DOI: 10.1016/j.neulet.2017.12.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 10/27/2017] [Accepted: 12/07/2017] [Indexed: 11/15/2022]
Abstract
Cognitive demands can influence the adaptation of walking, a crucial skill to maintain body stability and prevent falls. Whilst previous research has shown emotional load tunes goal-directed movements, little attention has been given to this finding. This study sought to assess the effects of suffering an extinction-resistant memory on skilled walking performance in adult rats, as an indicator of walking adaptability. Thus, 36 Wistar rats were divided in a two-part experiment. In the first part (n=16), the aversive, extinction-resistance memory paradigm was established using a fear-conditioning chamber. In the second, rats (n=20) were assessed in a neutral room using the ladder rung walking test before and tree days after inducing an extinction-resistance memory. In addition, the elevated plus-maze test was used to control the influence of the anxiety-like status on gait adaptability. Our results revealed the shock group exhibited worse walking adaptability (lower skilled walking score), when compared to the sham group. Moreover, the immobility time in the ladder rung walking test was similar to the controls, suggesting that gait adaptability performance was not a consequence of the fear generalization. No anxiety-like behavior was observed in the plus maze test. Finally, correlation coefficients also showed the skilled walking performance score was positively correlated with the number of gait cycles and trial time in the ladder rung walking test and the total crossings in the plus maze. Overall, these preliminary findings provide evidence to hypothesize an aversive, extinction-resistant experience might change the emotional load, affecting the ability to adapt walking.
Collapse
Affiliation(s)
- Filipe Mello Medeiros
- Cell and Tissue Laboratory, Biosciences College, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Neuroplasticity and Rehabilitation Research Group, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Graduate Program in Cellular and Molecular Biology, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | - Pedro Porto Alegre Baptista
- Cell and Tissue Laboratory, Biosciences College, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | - Laura Tartari Neves
- Cell and Tissue Laboratory, Biosciences College, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Graduate Program in Cellular and Molecular Biology, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | - Lucas Athaydes Martins
- Cell and Tissue Laboratory, Biosciences College, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Neuroplasticity and Rehabilitation Research Group, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | | | - Iván Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | - Léder Leal Xavier
- Cell and Tissue Laboratory, Biosciences College, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Neuroplasticity and Rehabilitation Research Group, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Graduate Program in Cellular and Molecular Biology, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil
| | - Kristen Hollands
- Health Sciences College, University of Salford, Manchester, United Kingdom
| | - Régis Gemerasca Mestriner
- Cell and Tissue Laboratory, Biosciences College, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Neuroplasticity and Rehabilitation Research Group, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil; Graduate Program in Cellular and Molecular Biology, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Brazil.
| |
Collapse
|
8
|
Garrido Zinn C, Bühler L, Cavalcante LE, Schmidt SD, Fagundes Ferreira F, Zanini ML, Guerino Furini CR, de Carvalho Myskiw J, Izquierdo I. Methylphenidate induces state-dependency of social recognition learning: Central components. Neurobiol Learn Mem 2018; 149:77-83. [PMID: 29408055 DOI: 10.1016/j.nlm.2018.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 01/18/2018] [Accepted: 02/03/2018] [Indexed: 11/29/2022]
Abstract
Methylphenidate (MPH) is a widely prescribed drug for the treatment of attention-deficit hyperactivity disorder. Findings in the literature suggest that the effects of MPH on memory may result from increased extracellular levels of norepinephrine (NE) and dopamine (DA). Here, we report that the systemic administration of MPH before the acquisition phase in a social discrimination task impaired the retrieval of the social recognition memory (SRM), but made it state-dependent: another administration of MPH before the retention test recovered the SRM. We observed that the induction of state dependency by MPH relies on the ventromedial prefrontal cortex (vmPFC), but not on the CA1 region of the hippocampus (CA1). Also, the inhibitors of NE and DA, nisoxetine and GBR12909, respectively, restored the SRM when infused into the vmPFC. Only the GBR12909 was able to restore the SRM in the CA1, whereas nisoxetine could not restore and even caused an impairment on memory retrieval when infused alone before the retention test. The data suggest that the state-dependence of SRM induced by MPH depends on an influence of both catecholamines on the vmPFC, while NE inhibits the retrieval of SRM on the hippocampus.
Collapse
Affiliation(s)
- Carolina Garrido Zinn
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Leticia Bühler
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Lorena Evelyn Cavalcante
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Scheila Daiane Schmidt
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Flávia Fagundes Ferreira
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil
| | - Mara Lise Zanini
- College of Chemistry, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6681, 90619-900 Porto Alegre, RS, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute for Translational Neuroscience (INNT), National Research Council of Brazil, Brazil
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute for Translational Neuroscience (INNT), National Research Council of Brazil, Brazil
| | - Ivan Izquierdo
- Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga, 6690-2nd Floor, 90610-000 Porto Alegre, RS, Brazil; National Institute for Translational Neuroscience (INNT), National Research Council of Brazil, Brazil.
| |
Collapse
|
9
|
Garrido Zinn C, Clairis N, Silva Cavalcante LE, Furini CRG, de Carvalho Myskiw J, Izquierdo I. Major neurotransmitter systems in dorsal hippocampus and basolateral amygdala control social recognition memory. Proc Natl Acad Sci U S A 2016; 113:E4914-9. [PMID: 27482097 PMCID: PMC4995962 DOI: 10.1073/pnas.1609883113] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Social recognition memory (SRM) is crucial for reproduction, forming social groups, and species survival. Despite its importance, SRM is still relatively little studied. Here we examine the participation of the CA1 region of the dorsal hippocampus (CA1) and the basolateral amygdala (BLA) and that of dopaminergic, noradrenergic, and histaminergic systems in both structures in the consolidation of SRM. Male Wistar rats received intra-CA1 or intra-BLA infusions of different drugs immediately after the sample phase of a social discrimination task and 24-h later were subjected to a 5-min retention test. Animals treated with the protein synthesis inhibitor, anisomycin, into either the CA1 or BLA were unable to recognize the previously exposed juvenile (familiar) during the retention test. When infused into the CA1, the β-adrenoreceptor agonist, isoproterenol, the D1/D5 dopaminergic receptor antagonist, SCH23390, and the H2 histaminergic receptor antagonist, ranitidine, also hindered the recognition of the familiar juvenile 24-h later. The latter drug effects were more intense in the CA1 than in the BLA. When infused into the BLA, the β-adrenoreceptor antagonist, timolol, the D1/D5 dopamine receptor agonist, SKF38393, and the H2 histaminergic receptor agonist, ranitidine, also hindered recognition of the familiar juvenile 24-h later. In all cases, the impairment to recognize the familiar juvenile was abolished by the coinfusion of agonist plus antagonist. Clearly, both the CA1 and BLA, probably in that order, play major roles in the consolidation of SRM, but these roles are different in each structure vis-à-vis the involvement of the β-noradrenergic, D1/D5-dopaminergic, and H2-histaminergic receptors therein.
Collapse
Affiliation(s)
- Carolina Garrido Zinn
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Nicolas Clairis
- Département de Biologie, Ecole Normale Supérieure de Lyon, 69007 Lyon, France
| | - Lorena Evelyn Silva Cavalcante
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil;
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil;
| |
Collapse
|
10
|
Fabbri R, Furini CRG, Passani MB, Provensi G, Baldi E, Bucherelli C, Izquierdo I, de Carvalho Myskiw J, Blandina P. Memory retrieval of inhibitory avoidance requires histamine H1 receptor activation in the hippocampus. Proc Natl Acad Sci U S A 2016; 113:E2714-20. [PMID: 27118833 PMCID: PMC4868453 DOI: 10.1073/pnas.1604841113] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Retrieval represents a dynamic process that may require neuromodulatory signaling. Here, we report that the integrity of the brain histaminergic system is necessary for retrieval of inhibitory avoidance (IA) memory, because rats depleted of histamine through lateral ventricle injections of α-fluoromethylhistidine (a-FMHis), a suicide inhibitor of histidine decarboxylase, displayed impaired IA memory when tested 2 d after training. a-FMHis was administered 24 h after training, when IA memory trace was already formed. Infusion of histamine in hippocampal CA1 of brain histamine-depleted rats (hence, amnesic) 10 min before the retention test restored IA memory but was ineffective when given in the basolateral amygdala (BLA) or the ventral medial prefrontal cortex (vmPFC). Intra-CA1 injections of selective H1 and H2 receptor agonists showed that histamine exerted its effect by activating the H1 receptor. Noteworthy, the H1 receptor antagonist pyrilamine disrupted IA memory retrieval in rats, thus strongly supporting an active involvement of endogenous histamine; 90 min after the retention test, c-Fos-positive neurons were significantly fewer in the CA1s of a-FMHis-treated rats that displayed amnesia compared with in the control group. We also found reduced levels of phosphorylated cAMP-responsive element binding protein (pCREB) in the CA1s of a-FMHis-treated animals compared with in controls. Increases in pCREB levels are associated with retrieval of associated memories. Targeting the histaminergic system may modify the retrieval of emotional memory; hence, histaminergic ligands might reduce dysfunctional aversive memories and improve the efficacy of exposure psychotherapies.
Collapse
Affiliation(s)
- Roberta Fabbri
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil; Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Florence, Italy
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Maria Beatrice Passani
- Dipartimento di Scienze della Salute, Sezione di Farmacologia e Chemioterapia, Universitá di Firenze, 50139 Florence, Italy
| | - Gustavo Provensi
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Florence, Italy
| | - Elisabetta Baldi
- Dipartimento di Medicina Sperimentale e Clinica, Universitá di Firenze, 50134 Florence, Italy
| | - Corrado Bucherelli
- Dipartimento di Medicina Sperimentale e Clinica, Universitá di Firenze, 50134 Florence, Italy
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil;
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil;
| | - Patrizio Blandina
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Florence, Italy;
| |
Collapse
|
11
|
Benetti F, Furini CRG, de Carvalho Myskiw J, Provensi G, Passani MB, Baldi E, Bucherelli C, Munari L, Izquierdo I, Blandina P. Histamine in the basolateral amygdala promotes inhibitory avoidance learning independently of hippocampus. Proc Natl Acad Sci U S A 2015; 112:E2536-42. [PMID: 25918368 PMCID: PMC4434720 DOI: 10.1073/pnas.1506109112] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Recent discoveries demonstrated that recruitment of alternative brain circuits permits compensation of memory impairments following damage to brain regions specialized in integrating and/or storing specific memories, including both dorsal hippocampus and basolateral amygdala (BLA). Here, we first report that the integrity of the brain histaminergic system is necessary for long-term, but not for short-term memory of step-down inhibitory avoidance (IA). Second, we found that phosphorylation of cyclic adenosine monophosphate (cAMP) responsive-element-binding protein, a crucial mediator in long-term memory formation, correlated anatomically and temporally with histamine-induced memory retrieval, showing the active involvement of histamine function in CA1 and BLA in different phases of memory consolidation. Third, we found that exogenous application of histamine in either hippocampal CA1 or BLA of brain histamine-depleted rats, hence amnesic, restored long-term memory; however, the time frame of memory rescue was different for the two brain structures, short lived (immediately posttraining) for BLA, long lasting (up to 6 h) for the CA1. Moreover, long-term memory was formed immediately after training restoring of histamine transmission only in the BLA. These findings reveal the essential role of histaminergic neurotransmission to provide the brain with the plasticity necessary to ensure memorization of emotionally salient events, through recruitment of alternative circuits. Hence, our findings indicate that the histaminergic system comprises parallel, coordinated pathways that provide compensatory plasticity when one brain structure is compromised.
Collapse
Affiliation(s)
- Fernando Benetti
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Gustavo Provensi
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Firenze, Italy; and
| | - Maria Beatrice Passani
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Firenze, Italy; and
| | - Elisabetta Baldi
- Dipartimento di Medicina Sperimentale e Clinica, Universitá di Firenze, 50134 Firenze, Italy
| | - Corrado Bucherelli
- Dipartimento di Medicina Sperimentale e Clinica, Universitá di Firenze, 50134 Firenze, Italy
| | - Leonardo Munari
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Firenze, Italy; and
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil;
| | - Patrizio Blandina
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco e Salute del Bambino, Sezione di Farmacologia e Tossicologia, Universitá di Firenze, 50139 Firenze, Italy; and
| |
Collapse
|
12
|
Menezes J, Alves N, Borges S, Roehrs R, de Carvalho Myskiw J, Furini CRG, Izquierdo I, Mello-Carpes PB. Facilitation of fear extinction by novelty depends on dopamine acting on D1-subtype dopamine receptors in hippocampus. Proc Natl Acad Sci U S A 2015; 112:E1652-8. [PMID: 25775606 PMCID: PMC4386331 DOI: 10.1073/pnas.1502295112] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Extinction is the learned inhibition of retrieval. Recently it was shown that a brief exposure to a novel environment enhances the extinction of contextual fear in rats, an effect explainable by a synaptic tagging-and-capture process. Here we examine whether this also happens with the extinction of another fear-motivated task, inhibitory avoidance (IA), and whether it depends on dopamine acting on D1 or D5 receptors. Rats were trained first in IA and then in extinction of this task. The retention of extinction was measured 24 h later. A 5-min exposure to a novel environment 30 min before extinction training enhanced its retention. Right after exposure to the novelty, animals were given bilateral intrahippocampal infusions of vehicle (VEH), of the protein synthesis inhibitor anisomycin, of the D1/D5 dopaminergic antagonist SCH23390, of the PKA inhibitor Rp-cAMP or of the PKC inhibitor Gö6976, and of the PKA stimulator Sp-cAMP or of the PKC stimulator PMA. The novelty increased hippocampal dopamine levels and facilitated the extinction, which was inhibited by intrahippocampal protein synthesis inhibitor anisomysin, D1/D5 dopaminerdic antagonist SCH23390, or PKA inhibitor Rp-cAMP and unaffected by PKC inhibitor Gö6976; additionally, the hippocampal infusion of PKA stimulator Sp-cAMP reverts the effect of D1/D5 dopaminergic antagonist SCH 23390, but the infusion of PKC stimulator PMA does not. The results attest to the generality of the novelty effect on fear extinction, suggest that it relies on synaptic tagging and capture, and show that it depends on hippocampal dopamine D1 but not D5 receptors.
Collapse
Affiliation(s)
- Jefferson Menezes
- Stress, Memory and Behavior Laboratory, Federal University of Pampa, 97500-970, Uruguaiana, RS, Brazil; and
| | - Niége Alves
- Stress, Memory and Behavior Laboratory, Federal University of Pampa, 97500-970, Uruguaiana, RS, Brazil; and
| | - Sidnei Borges
- Stress, Memory and Behavior Laboratory, Federal University of Pampa, 97500-970, Uruguaiana, RS, Brazil; and
| | - Rafael Roehrs
- Stress, Memory and Behavior Laboratory, Federal University of Pampa, 97500-970, Uruguaiana, RS, Brazil; and
| | - Jociane de Carvalho Myskiw
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), 90610-000, Porto Alegre, RS, Brazil
| | - Cristiane Regina Guerino Furini
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), 90610-000, Porto Alegre, RS, Brazil
| | - Ivan Izquierdo
- Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul (PUCRS), 90610-000, Porto Alegre, RS, Brazil
| | - Pâmela B Mello-Carpes
- Stress, Memory and Behavior Laboratory, Federal University of Pampa, 97500-970, Uruguaiana, RS, Brazil; and
| |
Collapse
|
13
|
de Carvalho Myskiw J, Furini CRG, Schmidt B, Ferreira F, Izquierdo I. Extinction learning, which consists of the inhibition of retrieval, can be learned without retrieval. Proc Natl Acad Sci U S A 2015; 112:E230-3. [PMID: 25550507 PMCID: PMC4299186 DOI: 10.1073/pnas.1423465112] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
In the present study we test the hypothesis that extinction is not a consequence of retrieval in unreinforced conditioned stimulus (CS) presentation but the mere perception of the CS in the absence of a conditioned response. Animals with cannulae implanted in the CA1 region of hippocampus were subjected to extinction of contextual fear conditioning. Muscimol infused intra-CA1 before an extinction training session of contextual fear conditioning (CFC) blocks retrieval but not consolidation of extinction measured 24 h later. Additionally, this inhibition of retrieval does not affect early persistence of extinction when tested 7 d later or its spontaneous recovery after 2 wk. Furthermore, both anisomycin, an inhibitor of ribosomal protein synthesis, and rapamycin, an inhibitor of extraribosomal protein synthesis, given into the CA1, impair extinction of CFC regardless of whether its retrieval was blocked by muscimol. Therefore, retrieval performance in the first unreinforced session is not necessary for the installation, maintenance, or spontaneous recovery of extinction of CFC.
Collapse
Affiliation(s)
- Jociane de Carvalho Myskiw
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Cristiane Regina Guerino Furini
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Bianca Schmidt
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Flávia Ferreira
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| | - Ivan Izquierdo
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute of Rio Grande do Sul, Pontifical Catholic University of Rio Grande do Sul, 90610-000 Porto Alegre, RS, Brazil
| |
Collapse
|
14
|
de Carvalho Myskiw J, Furini CRG, Benetti F, Izquierdo I. Hippocampal molecular mechanisms involved in the enhancement of fear extinction caused by exposure to novelty. Proc Natl Acad Sci U S A 2014; 111:4572-7. [PMID: 24591622 PMCID: PMC3970530 DOI: 10.1073/pnas.1400423111] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Exposure to a novel environment enhances the extinction of contextual fear. This has been explained by tagging of the hippocampal synapses used in extinction, followed by capture of proteins from the synapses that process novelty. The effect is blocked by the inhibition of hippocampal protein synthesis following the novelty or the extinction. Here, we show that it can also be blocked by the postextinction or postnovelty intrahippocampal infusion of the NMDA receptor antagonist 2-amino-5-phosphono pentanoic acid; the inhibitor of calcium/calmodulin-dependent protein kinase II (CaMKII), autocamtide-2-related inhibitory peptide; or the blocker of L-voltage-dependent calcium channels (L-VDCCs), nifedipine. Inhibition of proteasomal protein degradation by β-lactacystin has no effect of its own on extinction or on the influence of novelty thereon but blocks the inhibitory effects of all the other substances except that of rapamycin on extinction, suggesting that their action depends on concomitant synaptic protein turnover. Thus, the tagging-and-capture mechanism through which novelty enhances fear extinction involves more molecular processes than hitherto thought: NMDA receptors, L-VDCCs, CaMKII, and synaptic protein turnover.
Collapse
Affiliation(s)
- Jociane de Carvalho Myskiw
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, 90610-000, Brazil
| | - Cristiane Regina Guerino Furini
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, 90610-000, Brazil
| | - Fernando Benetti
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, 90610-000, Brazil
| | - Ivan Izquierdo
- National Institute of Translational Neuroscience, National Research Council of Brazil, and Memory Center, Brain Institute, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, 90610-000, Brazil
| |
Collapse
|
15
|
|