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Memory reconsolidation

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https://www.readbyqxmd.com/read/29412170/propranolol-disrupts-consolidation-of-emotional-memory-in-lymnaea
#1
Tamila Shymansky, Emily Hughes, Cailin M Rothwell, Ken Lukowiak
The therapeutic efficacy of the synthetic β-adrenergic receptor blocker, propranolol, for the treatment of post-traumatic stress disorder (PTSD) is currently being debated. Mixed results have been published regarding propranolol's ability to disrupt the consolidation and reconsolidation of memories. Here, we use the invertebrate model Lymnaea to study propranolol's ability to disrupt consolidation of memories formed under varying various types of stress which cause differing degrees of emotional memory. We show that when propranolol is administered immediately following operant conditioning, only the consolidation process of memories enhanced by individual stressors (i...
February 3, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29411070/saccharin-fading-is-not-required-for-the-acquisition-of-alcohol-self-administration-and-can-alter-the-dynamics-of-cue-alcohol-memory-reconsolidation
#2
Mickaël Puaud, Zofia Ossowska, Jordan Barnard, Amy L Milton
RATIONALE: Animal models of alcohol-seeking are useful for understanding alcohol addiction and for treatment development, but throughput in these models is limited by the extensive pretraining required to overcome the aversive taste of ethanol. Work by Augier et al. (Psychopharmacology 231: 4561-4568, 2014) indicates that Wistar rats will self-administer alcohol without water deprivation, exposure to sweetened ethanol solutions or intermittent access to ethanol. OBJECTIVES AND METHODS: We sought to replicate and extend the work of Augier et al...
February 6, 2018: Psychopharmacology
https://www.readbyqxmd.com/read/29397283/the-metaplastic-effects-of-nmda-receptors-blockade-on-reactivation-of-instrumental-memories-in-rats
#3
Alessandro Piva, Elisabetta Gerace, Marzia Di Chio, Lisa Osanni, Laura Padovani, Lucia Caffino, Fabio Fumagalli, Domenico E Pellegrini-Giampietro, Cristiano Chiamulera
Metaplasticity, defined as the plasticity of synaptic plasticity, could affect learning and memory at different neural levels. It was hypothesized that metaplasticity changes on glutamate receptors may affect memory destabilization, promoting or preventing reconsolidation. We investigated the metaplastic effect of NMDA channel blocker MK-801 on sucrose instrumental memory reconsolidation in a behavioural rat model associated to the assessment of molecular markers of metaplasticity, memory retrieval, destabilization and reconsolidation...
January 31, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29364255/a-prediction-error-driven-retrieval-procedure-for-destabilizing-and-rewriting-maladaptive-reward-memories-in-hazardous-drinkers
#4
Ravi K Das, Grace Gale, Vanessa Hennessy, Sunjeev K Kamboj
Maladaptive reward memories (MRMs) can become unstable following retrieval under certain conditions, allowing their modification by subsequent new learning. However, robust (well-rehearsed) and chronologically old MRMs, such as those underlying substance use disorders, do not destabilize easily when retrieved. A key determinate of memory destabilization during retrieval is prediction error (PE). We describe a retrieval procedure for alcohol MRMs in hazardous drinkers that specifically aims to maximize the generation of PE and therefore the likelihood of MRM destabilization...
January 5, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29352277/influence-of-early-stress-on-memory-reconsolidation-implications-for-post-traumatic-stress-disorder-treatment
#5
Hélène Villain, Aïcha Benkahoul, Philippe Birmes, Barbara Ferry, Pascal Roullet
Post-traumatic stress disorder (PTSD) is a common consequence of exposure to a life-threatening event. Currently, pharmacological treatments are limited by high rates of relapse, and novel treatment approaches are needed. We have recently demonstrated that propranolol, a β-adrenergic antagonist, inhibited aversive memory reconsolidation in animals. Following this, in an open-label study 70% of patients with PTSD treated with propranolol during reactivation of traumatic memory exhibited full remission. However, the reason why 30% of these patients did not respond positively to propranolol treatment is still unclear...
2018: PloS One
https://www.readbyqxmd.com/read/29352036/multiple-memory-systems-multiple-time-points-how-science-can-inform-treatment-to-control-the-expression-of-unwanted-emotional-memories
#6
REVIEW
Renée M Visser, Alex Lau-Zhu, Richard N Henson, Emily A Holmes
Memories that have strong emotions associated with them are particularly resilient to forgetting. This is not necessarily problematic, however some aspects of memory can be. In particular, the involuntary expression of those memories, e.g. intrusive memories after trauma, are core to certain psychological disorders. Since the beginning of this century, research using animal models shows that it is possible to change the underlying memory, for example by interfering with its consolidation or reconsolidation...
March 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29352032/the-surprising-subtleties-of-changing-fear-memory-a-challenge-for-translational-science
#7
REVIEW
Merel Kindt
Current pharmacological and psychological treatments for disorders of emotional memory only dampen the affective response while leaving the original fear memory intact. Under adverse circumstances, these original memories regain prominence, causing relapses in many patients. The (re)discovery in neuroscience that after reactivation consolidated fear memories may return to a transient labile state, requiring a process of restabilization in order to persist, offers a window of opportunity for modifying fear memories with amnestic agents...
March 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29352026/addictive-behaviour-in-experimental-animals-prospects-for-translation
#8
REVIEW
Barry J Everitt, Chiara Giuliano, David Belin
Since the introduction of intravenous drug self-administration methodology over 50 years ago, experimental investigation of addictive behaviour has delivered an enormous body of data on the neural, psychological and molecular mechanisms of drug reward and reinforcement and the neuroadaptations to chronic use. Whether or not these behavioural and molecular studies are viewed as modelling the underpinnings of addiction in humans, the discussion presented here highlights two areas-the impact of drug-associated conditioned stimuli-or drug cues-on drug seeking and relapse, and compulsive cocaine seeking...
March 19, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29339294/ketamine-for-the-treatment-of-addiction-evidence-and-potential-mechanisms
#9
REVIEW
I Ivan Ezquerra-Romano, W Lawn, E Krupitsky, C J A Morgan
Ketamine is a dissociative anaesthetic drug which acts on the central nervous system chiefly through antagonism of the n-methyl-d-aspartate (NMDA) receptor. Recently, ketamine has attracted attention as a rapid-acting anti-depressant but other studies have also reported its efficacy in reducing problematic alcohol and drug use. This review explores the preclinical and clinical research into ketamine's ability to treat addiction. Despite methodological limitations and the relative infancy of the field, results thus far are promising...
January 12, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29325446/reduction-of-ptsd-symptoms-with-pre-reactivation-propranolol-therapy-a-randomized-controlled-trial
#10
Alain Brunet, Daniel Saumier, Aihua Liu, David L Streiner, Jacques Tremblay, Roger K Pitman
OBJECTIVE: The authors assessed the efficacy of trauma memory reactivation performed under the influence of propranolol, a noradrenergic beta-receptor blocker, as a putative reconsolidation blocker, in reducing symptoms of posttraumatic stress disorder (PTSD). METHOD: This was a 6-week, double-blind, placebo-controlled, randomized clinical trial in 60 adults diagnosed with long-standing PTSD. Propranolol or placebo was administered 90 minutes before a brief memory reactivation session, once a week for 6 consecutive weeks...
January 12, 2018: American Journal of Psychiatry
https://www.readbyqxmd.com/read/29318708/cocaine-conditioned-place-preference-unexpected-suppression-of-preference-due-to-testing-combined-with-strong-conditioning
#11
Lucile Marion-Poll, Antoine Besnard, Sophie Longueville, Emmanuel Valjent, Olivia Engmann, Jocelyne Caboche, Denis Hervé, Jean-Antoine Girault
Conditioned place preference (CPP) is widely used for evaluating the rewarding effects of drugs. Like other memories, CPP is proposed to undergo reconsolidation during which it is unstable and sensitive to pharmacological inhibition. Previous studies have shown that cocaine CPP can be apparently erased by extracellular signal-regulated kinase (ERK) pathway inhibition during cocaine reconditioning (re-exposure to the drug-paired environment in the presence of the drug). Here, we show that blockade of D1 receptors during reconditioning prevented ERK activation and induced a loss of CPP...
January 10, 2018: Addiction Biology
https://www.readbyqxmd.com/read/29287782/naringenin-induced-enhanced-antioxidant-defence-system-meliorates-cholinergic-neurotransmission-and-consolidates-memory-in-male-rats
#12
Laraib Liaquat, Zehra Batool, Sadia Sadir, Sahar Rafiq, SidrahShahzad, Tahira Perveen, Saida Haider
AIMS: Free radical mediated neurotoxicity is a leading cause of neurodegenerative disorders. Neurodegeneration due to oxidative stress can produce cognitive dysfunctions. Flavonoids and curcuminoids are naturally occurring polyphenolic compounds that display a variety of therapeutic importance against oxidative stress. MAIN METHODS: This study was designed to assess potential role of polyphenolic compounds in neurocognitive functions and prevention against oxidative stress...
December 26, 2017: Life Sciences
https://www.readbyqxmd.com/read/29259554/strengthening-of-existing-episodic-memories-through-non-invasive-stimulation-of-prefrontal-cortex-in-older-adults-with-subjective-memory-complaints
#13
Rosa Manenti, Marco Sandrini, Elena Gobbi, Chiara Cobelli, Michela Brambilla, Giuliano Binetti, Maria Cotelli
Episodic memory is critical to daily life functioning. This type of declarative memory declines with age and is the earliest cognitive function to be compromised in Alzheimer's disease (AD). Subjective memory complaints are commonly reported by older adults and have been considered a risk factor for developing AD. The possibilities for prevention of memory disorders in older adults have increased substantially in recent years. Previous studies have shown that anodal transcranial Direct Current Stimulation (tDCS) applied over the left lateral prefrontal cortex (PFC) after a contextual reminder strengthened existing verbal episodic memories, conceivably through reconsolidation, in elderly people...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29258546/hippocampal-calpain-is-required-for-the-consolidation-and-reconsolidation-but-not-extinction-of-contextual-fear-memory
#14
Taikai Nagayoshi, Kiichiro Isoda, Nori Mamiya, Satoshi Kida
Memory consolidation, reconsolidation, and extinction have been shown to share similar molecular signatures, including new gene expression. Calpain is a Ca2+-dependent protease that exerts its effects through the proteolytic cleavage of target proteins. Neuron-specific conditional deletions of calpain 1 and 2 impair long-term potentiation in the hippocampus and spatial learning. Moreover, recent studies have suggested distinct roles of calpain 1 and 2 in synaptic plasticity. However, the role of hippocampal calpain in memory processes, especially memory consolidation, reconsolidation, and extinction, is still unclear...
December 19, 2017: Molecular Brain
https://www.readbyqxmd.com/read/29249946/moderate-partially-reduplicated-conditioned-stimuli-as-retrieval-cue-can-increase-effect-on-preventing-relapse-of-fear-to-compound-stimuli
#15
Junjiao Li, Wei Chen, Jingwen Caoyang, Wenli Wu, Jing Jie, Liang Xu, Xifu Zheng
The theory of memory reconsolidation argues that consolidated memory is not unchangeable. Once a memory is reactivated it may go back into an unstable state and need new protein synthesis to be consolidated again, which is called "memory reconsolidation". Boundary studies have shown that interfering with reconsolidation through pharmacologic or behavioral intervention can lead to the updating of the initial memory, for example, erasing undesired memories. Behavioral procedures based on memory reconsolidation interference have been shown to be an effective way to inhibit fear memory relapse after extinction...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29248756/changes-in-the-element-concentration-of-the-dorsal-hippocampus-ca1-region-during-memory-consolidation-and-reconsolidation
#16
Paulo Fernandes Costa Jobim, Carla Eliete Iochims Dos Santos, Luka Jeromel, Primoz Pellicon, Livio Amaral, Johnny Ferraz Dias
The concentration and distribution of Mg, P, Cl, K, Cu and Zn in the dorsal hippocampus CA1 region of rat brains were studied during memory consolidation and reconsolidation processes stimulated with inhibitory avoidance (IA) tests. Experimental rats were divided into four groups: i) group not submitted to inhibitory avoidance task (IA-N); ii) group submitted to inhibitory avoidance training session (IA-Y); iii) group submitted to inhibitory avoidance reactivation session but did not step down from the platform (IAR-N); and iv) group submitted to avoidance reactivation session and stepped down from the platform (IAR-Y)...
December 14, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/29241423/reconsolidation-of-traumatic-memories-for-ptsd-a-randomized-controlled-trial-of-74-male-veterans
#17
Richard Gray, Denise Budden-Potts, Frank Bourke
DESIGN: A randomized waitlist-controlled design (n = 74) examined the efficacy of Reconsolidation of Traumatic Memories (RTM) among male veterans with current-month flashbacks and nightmares. Volunteers were randomly assigned to immediate treatment (three 120-minute sessions of RTM), or to a 3-week waiting condition before receiving the RTM treatment. Blinded psychometricians evaluated the symptoms at intake, 2 weeks, and 6 weeks post. Wait-listed participants were re-evaluated and then treated...
December 14, 2017: Psychotherapy Research: Journal of the Society for Psychotherapy Research
https://www.readbyqxmd.com/read/29225045/post-reexposure-administration-of-riluzole-attenuates-the-reconsolidation-of-conditioned-fear-memory-in-rats
#18
Kie Akagi, Misa Yamada, Akiyoshi Saitoh, Jun-Ichiro Oka, Mitsuhiko Yamada
Recently, we demonstrated that riluzole, which has been shown to block the glutamatergic system, facilitates fear extinction in rats. Here, we undertook experiments on contextual fear conditioning to clarify the actions of riluzole on the reconsolidation of fear memory in rats. We used the fast-acting benzodiazepine midazolam as a reconsolidation-inhibiting control drug. We demonstrated that riluzole (3 mg/kg) and midazolam (1 mg/kg) impaired the reconsolidation of contextual fear memory. Results from spontaneous recovery experiments also suggested that riluzole attenuated reconsolidation...
December 7, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29216351/1-adrenoceptor-in-the-central-amygdala-is-required-for-unconditioned-stimulus-induced-drug-memory-reconsolidation
#19
Huiwen Zhu, Yiming Zhou, Zhiyuan Liu, Xi Chen, Yanqing Li, Xing Liu, Lan Ma
Background: Drug memories become labile and reconsolidated after retrieval by presentation of environmental cues (conditioned stimulus, CS) or drugs (unconditioned stimulus, US). Whether CS- and US-retrieval trigger different memory reconsolidation processes is not clear. Methods: Protein synthesis inhibitor or β-AR antagonist was systemically administrated or intra-central amygdala (CeA) infused immediately after cocaine re-exposure in cocaine-conditioned place preference (CPP) or self-administration (SA) mice models...
December 5, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29191578/gastrin-releasing-peptide-attenuates-fear-memory-reconsolidation
#20
A Murkar, P Kent, C Cayer, J James, Z Merali
BACKGROUND: Gastrin Releasing Peptide (GRP) may play a role in fear learning. The GRP Receptor is expressed in the basolateral amygdala and hippocampus, and central administration of GRP mediates fear learning. The effects of GRP on reconsolidation, however, have been minimally explored. Reconsolidation, the process by which formed memories are rendered labile following recall, provides a window of opportunity for pharmacological intervention. Although evidence suggests the window of opportunity to alter reactivated consolidation memory can be as long as 6h, shorter intervals have not been extensively investigated...
November 27, 2017: Behavioural Brain Research
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