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Memory reconsolidation

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https://www.readbyqxmd.com/read/29054430/nmda-receptor-dependent-changes-in-c-fos-and-p-creb-signaling-following-extinction-and-reinstatement-of-morphine-place-preference
#1
Ali Siahposht-Khachaki, Somayeh Ezzatpanah, Yasaman Razavi, Abbas Haghparast
Neural circuitry comprising the ventral tegmental area, nucleus accumbens (NAc), prefrontal cortex (PFC) and hippocampus (HIP) has a main role in reward phenomena. Previous behavioral studies indicated that intracerebroventricular administration of AP5 (NMDA glutamate receptor antagonist) and CNQX (AMPA/kainate glutamate receptor antagonist) during the extinction and before reinstatement of morphine-induced conditioned place preference (CPP) reduced the extinction period and reinstatement of morphine-CPP. Therefore, in the present study, we tried to evaluate the effect of antagonism of NMDA glutamate receptors on the p-CREB/CREB ratio and c-fos expression in the NAc, PFC and HIP during these two phases of morphine-CPP in male adult albino Wistar rats...
October 17, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29042315/-interleukin-1-beta-reduces-glua1-phosphorylation-and-its-surface-expression-during-memory-reconsolidation-and-alpha-melanocyte-stimulating-hormone-can-modulate-these-effects
#2
Ivana Machado, Helgi B Schiöth, Mercedes Lasaga, Teresa Scimonelli
Pro-inflammatory cytokines can affect cognitive processes such as learning and memory. Particularly, interleukin-1β (IL-1β) influences hippocampus-dependent memories. We previously reported that administration of IL-1β in dorsal hippocampus impaired contextual fear memory reconsolidation. This effect was reversed by the melanocortin alpha-melanocyte-stimulating hormone (α-MSH). Our results also demonstrated that IL-1β produced a significant decrease in glutamate release from dorsal hippocampus synaptosomes after reactivation of the fear memory...
October 14, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29028150/potential-of-micrornas-as-novel-targets-in-the-alleviation-of-pathological-fear
#3
REVIEW
Conor P Murphy, Nicolas Singewald
The current treatment of post-traumatic stress disorder (PTSD), phobias and other anxiety disorders, remains insufficient particularly in producing long-lasting full symptom control. Dysfunctional fear processing is common in these disorders, including a deficiency in fear-inhibitory mechanisms and impairment in the ability to discriminate between safety and danger cues. Research has aimed to elucidate brain circuitries, neurotransmitters and downstream signaling pathways important in the alleviation of aberrant fear, with a specific focus on mechanisms modulating fear memory and its behavioral expression...
October 13, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/28963883/acute-physical-exercise-in-humans-enhances-reconsolidation-of-emotional-memories
#4
Dharani Keyan, Richard A Bryant
Increasing evidence suggests that when a memory is reactivated through retrieval, it becomes temporarily vulnerable to environmental or pharmacological manipulation, which can consequently update or strengthen the memory. Physical exercise has been shown to modulate the maintenance of fear memories in animals following memory reactivation. This study investigated the effect of intense exercise in modulating the reconsolidation of trauma memories. Fifty-four undergraduate students watched a trauma film depicting the aftermath of a highway car crash...
September 22, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28916448/molecular-and-synaptic-mechanisms-regulating-drug-associated-memories-towards-a-bidirectional-treatment-strategy
#5
REVIEW
Matthew T Rich, Mary M Torregrossa
The successful treatment of substance use disorders is dependent on the establishment of a long-term abstinent state. Relapse can be suppressed by interfering with memories of drug use that are evoked by re-exposure to drug-associated contexts and cues. Two strategies for accomplishing this goal are either to prevent drug-memory reconsolidation or to induce the formation of a competing, extinction memory. However, clinical attempts to prolong abstinence by behavioral modification of drug-related memories have had limited success...
September 13, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28891529/nonsynaptic-plasticity-model-of-long-term-memory-engrams
#6
L A Cacha, J Ali, Z H Rizvi, P P Yupapin, R R Poznanski
Using steady-state electrical properties of non-ohmic dendrite based on cable theory, we derive electrotonic potentials that do not change over time and are localized in space. We hypothesize that clusters of such stationary, local and permanent pulses are the electrical signatures of enduring memories which are imprinted through nonsynaptic plasticity, encoded through epigenetic mechanisms, and decoded through electrotonic processing. We further hypothesize how retrieval of an engram is made possible by integration of these permanently imprinted standing pulses in a neural circuit through neurotransmission in the extracellular space as part of conscious recall that acts as a guiding template in the reconsolidation of long-term memories through novelty characterized by uncertainty that arises when new fragments of memories reinstate an engram by way of nonsynaptic plasticity that permits its destabilization...
2017: Journal of Integrative Neuroscience
https://www.readbyqxmd.com/read/28887561/enhancement-of-extinction-memory-by-pharmacological-and-behavioral-interventions-targeted-to-its-reactivation
#7
Josué Haubrich, Adriano Machado, Flávia Zacouteguy Boos, Ana P Crestani, Rodrigo O Sierra, Lucas de Oliveira Alvares, Jorge A Quillfeldt
Extinction is a process that involves new learning that inhibits the expression of previously acquired memories. Although temporarily effective, extinction does not erase an original fear association. Since the extinction trace tends to fade over time, the original memory can resurge. On the other hand, strengthening effects have been described in several reconsolidation studies using different behavioral and pharmacological manipulations. In order to know whether an extinction memory can be strengthened by reactivation-based interventions in the contextual fear conditioning task, we began by replicating the classic phenomenon of spontaneous recovery to show that brief reexposure sessions can prevent the decay of the extinction trace over time in a long-lasting way...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887385/prior-learning-of-relevant-nonaversive-information-is-a-boundary-condition-for-avoidance-memory-reconsolidation-in-the-rat-hippocampus
#8
Andressa Radiske, Maria Carolina Gonzalez, Sergio A Conde-Ocazionez, Anatildes Feitosa, Cristiano A Köhler, Lia R Bevilaqua, Martín Cammarota
Reactivated memories can be modified during reconsolidation, making this process a potential therapeutic target for posttraumatic stress disorder (PTSD), a mental illness characterized by the recurring avoidance of situations that evoke trauma-related fears. However, avoidance memory reconsolidation depends on a set of still loosely defined boundary conditions, limiting the translational value of basic research. In particular, the involvement of the hippocampus in fear-motivated avoidance memory reconsolidation remains controversial...
October 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28883499/a-reminder-before-extinction-strengthens-episodic-memory-via-reconsolidation-but-fails-to-disrupt-generalized-threat-responses
#9
Marijn C W Kroes, Joseph E Dunsmoor, Qi Lin, Michael Evans, Elizabeth A Phelps
A reminder can temporarily renew flexibility of consolidated memories, referred to as reconsolidation. Pavlovian threat-conditioning studies suggest that a reminder can renew flexibility of threat responses but that episodic memories remain stable. In contrast, outside the threat-conditioning domain, studies testing memory for word lists or stories find that a reminder can renew flexibility of episodic memory. This discrepancy in findings leaves it unclear if episodic memories reconsolidate, or only Pavlovian responses...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28839217/re-stepping-into-the-same-river-competition-problem-rather-than-a-reconsolidation-failure-in-an-established-motor-skill
#10
Ella Gabitov, Arnaud Boutin, Basile Pinsard, Nitzan Censor, Stuart M Fogel, Geneviève Albouy, Bradley R King, Habib Benali, Julie Carrier, Leonardo G Cohen, Avi Karni, Julien Doyon
Animal models suggest that consolidated memories return to their labile state when reactivated and need to be restabilized through reconsolidation processes to persist. Consistent with this notion, post-reactivation pharmacological protein synthesis blockage results in mnemonic failure in hippocampus-dependent memories. It has been proposed that, in humans, post-reactivation experience with a competitive task can also interfere with memory restabilization. However, several studies failed to induce performance deficit implementing this approach...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28822294/does-reconsolidation-occur-in-natural-settings-memory-reconsolidation-and-anxiety-disorders
#11
REVIEW
Rodrigo S Fernández, María E Pedreira, Mariano M Boccia
In normal settings, our brain is able to update its stored representations in content, strength, and/or expectations by the memory reconsolidation process. Thus, a reactivated memory enters in a transient labile state (destabilization) followed by a re-stabilization phase in order to persist (memory reconsolidation). Cognitive neuroscience and its insight into psychiatric problems attributed a close relationship between memory (formation, maintenance, and utilization) and several mental disorders. In this framework, the reconsolidation process could be not only the mechanism for maintenance of some psychopathologies, but also open a novel therapeutic window...
November 2017: Clinical Psychology Review
https://www.readbyqxmd.com/read/28821652/calpain-grip-signaling-in-nucleus-accumbens-core-mediates-the-reconsolidation-of-drug-reward-memory
#12
Jie Liang, Jia-Li Li, Ying Han, Yi-Xiao Luo, Yan-Xue Xue, Yàn Zhang, Yán Zhang, Li-Bo Zhang, Man-Li Chen, Lin Lu, Jie Shi
Exposure to drug-paired cues causes drug memories to be in a destabilized state and interfering with memory reconsolidation can inhibit relapse. Calpain, a calcium-dependent neutral cysteine protease, is involved in synaptic plasticity and the formation of long-term fear memory. However, the role of calpain in the reconsolidation of drug reward memory is still unknown. In the present study, using a conditioned place preference (CPP) model, we found that exposure to drug-paired contextual stimuli induced the activation of calpain and decreased the expression of glutamate receptor interacting protein 1 (GRIP1) in the nucleus accumbens (NAc) core, but not shell, of male rats...
September 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28814473/breaking-boundaries-optimizing-reconsolidation-based-interventions-for-strong-and-old-memories
#13
James W B Elsey, Merel Kindt
Recent research has demonstrated that consolidated memories can enter a temporary labile state after reactivation, requiring restabilization in order to persist. This process, known as reconsolidation, potentially allows for the modification and disruption of memory. Much interest in reconsolidation stems from the possibility that maladaptive memory traces-a core feature of several psychiatric conditions-could be tackled by disrupting their reconsolidation. However, research has indicated a range of supposed boundary conditions on the induction of reconsolidation...
September 2017: Learning & Memory
https://www.readbyqxmd.com/read/28814464/on-the-transition-from-reconsolidation-to-extinction-of-contextual-fear-memories
#14
Lindsey F Cassini, Charlotte R Flavell, Olavo B Amaral, Jonathan L C Lee
Retrieval of an associative memory can lead to different phenomena. Brief reexposure sessions tend to trigger reconsolidation, whereas more extended ones trigger extinction. In appetitive and fear cued Pavlovian memories, an intermediate "null point" period has been observed where neither process seems to be engaged. Here we investigated whether this phenomenon extends to contextual fear memory. Adult rats were subjected to a contextual fear conditioning paradigm, reexposed to the context 2 d later for 3, 5, 10, 20, or 30 min, with immediate injections of MK-801 or saline following reexposure, and tested on the following day...
September 2017: Learning & Memory
https://www.readbyqxmd.com/read/28757864/dorsoventral-and-proximodistal-hippocampal-processing-account-for-the-influences-of-sleep-and-context-on-memory-re-consolidation-a-connectionist-model
#15
Justin Lines, Kelsey Nation, Jean-Marc Fellous
The context in which learning occurs is sufficient to reconsolidate stored memories and neuronal reactivation may be crucial to memory consolidation during sleep. The mechanisms of context-dependent and sleep-dependent memory (re)consolidation are unknown but involve the hippocampus. We simulated memory (re)consolidation using a connectionist model of the hippocampus that explicitly accounted for its dorsoventral organization and for CA1 proximodistal processing. Replicating human and rodent (re)consolidation studies yielded the following results...
2017: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/28736133/knockdown-of-zif268-in-the-posterior-dorsolateral-striatum-does-not-enduringly-disrupt-a-response-memory-of-a-rewarded-t-maze-task
#16
Emma N Cahill, George H Vousden, Marc T J Exton-McGuinness, Ian R C Beh, Casey B Swerner, Matej Macak, Sameera Abas, Cameron C Cole, Brian F Kelleher, Barry J Everitt, Amy L Milton
Under certain conditions pavlovian memories undergo reconsolidation, whereby the reactivated memory can be disrupted by manipulations such as knockdown of zif268. For instrumental memories, reconsolidation disruption is less well established. Our previous, preliminary data identified that there was an increase in Zif268 in the posterior dorsolateral striatum (pDLS) after expression of an instrumental habit-like 'response' memory, but not an instrumental goal-directed 'place' memory on a T-maze task. Here, the requirement for Zif268 in the reconsolidation of a response memory was tested by knockdown of Zif268, using antisense oligodeoxynucleotide infusion into the pDLS, at memory reactivation...
July 21, 2017: Neuroscience
https://www.readbyqxmd.com/read/28733209/intervention-strength-does-not-differentially-affect-memory-reconsolidation-of-strong-memories
#17
Kevin van Schie, Suzanne C van Veen, Yanniek R Hendriks, Marcel A van den Hout, Iris M Engelhard
Recently, it has become clear that retrieval (i.e., reactivation) of consolidated memories may return these memories into a labile state before they are restored into long-term memory ('reconsolidation'). Using behavioral manipulations, reactivated memories can be disrupted via the mechanism of novel learning. In the present study, we investigated whether changing a strong memory during reconsolidation depends on the strength of novel learning. To test this, participants (N=144) in six groups acquired a relatively strong memory on Day 1 by viewing and recalling a series of pictures three times...
July 18, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28729064/effects-of-cannabinoid-drugs-on-aversive-or-rewarding-drug-associated-memory-extinction-and-reconsolidation
#18
REVIEW
Cristina A J Stern, Cristiane R de Carvalho, Leandro J Bertoglio, Reinaldo N Takahashi
Posttraumatic stress and drug use disorders may stem from aberrant memory formation. As the endocannabinoid (eCB) system has a pivotal role in emotional memory processing and related synaptic plasticity, here we seek to review and discuss accumulating evidence on how and where in the brain interventions targeting the eCB system would attenuate outcomes associated with traumatic events and/or drug addiction through memory extinction facilitation or reconsolidation disruption. Currently available data from mouse, rat, monkey and healthy human studies investigating the effects of cannabinoid drugs on extinction and reconsolidation of aversive memories are more consistent than those related to rewarding drug-associated memories...
July 17, 2017: Neuroscience
https://www.readbyqxmd.com/read/28716956/a-comparison-of-behavioral-and-pharmacological-interventions-to-attenuate-reactivated-fear-memories
#19
Roque I Ferrer Monti, Joaquín M Alfei, Matías Mugnaini, Adrián M Bueno, Tom Beckers, Gonzalo P Urcelay, Victor A Molina
Two experiments using rats in a contextual fear memory preparation compared two approaches to reduce conditioned fear: (1) pharmacological reconsolidation blockade and (2) reactivation-plus-extinction training. In Experiment 1, we explored different combinations of reactivation-plus-extinction parameters to reduce conditioned fear and attenuate reacquisition. In Experiment 2, memory reactivation was followed by extinction training or administration of midazolam (MDZ) (vs. vehicle) to reduce conditioned fear and attenuate spontaneous recovery...
August 2017: Learning & Memory
https://www.readbyqxmd.com/read/28716952/differential-involvement-of-the-medial-prefrontal-cortex-across-variants-of-contextual-fear-conditioning
#20
Nicholas A Heroux, Patrese A Robinson-Drummer, Hollie R Sanders, Jeffrey B Rosen, Mark E Stanton
The context preexposure facilitation effect (CPFE) is a contextual fear conditioning paradigm in which learning about the context, acquiring the context-shock association, and retrieving/expressing contextual fear are temporally dissociated into three distinct phases. In contrast, learning about the context and the context-shock association happens concurrently in standard contextual fear conditioning (sCFC). By infusing the GABAA receptor agonist muscimol into medial prefrontal cortex (mPFC) in adolescent Long-Evans rats, the current set of experiments examined the functional role of the mPFC in each phase of the CPFE and sCFC...
August 2017: Learning & Memory
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