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https://www.readbyqxmd.com/read/28176408/hippocampal-release-of-dopamine-and-norepinephrine-encodes-novel-contextual-information
#1
Perla Moreno-Castilla, Rodrigo Pérez-Ortega, Valeria Violante-Soria, Israela Balderas, Federico Bermúdez-Rattoni
The detection and processing of novel information encountered in our environment is crucial for proper adaptive behavior and learning. Hippocampus is a prime structure for novelty detection that receives high-level inputs including context information. It is of our interest to understand the mechanisms by which the hippocampus processes contextual information. For this, we performed in vivo microdyalisis in order to monitor extracellular changes in neurotransmitter levels during Object Location Memory (OLM), a behavioral protocol developed to evaluate contextual information processing in recognition memory...
February 8, 2017: Hippocampus
https://www.readbyqxmd.com/read/28011191/determinants-to-trigger-memory-reconsolidation-the-role-of-retrieval-and-updating-information
#2
Carlos J Rodriguez-Ortiz, Federico Bermúdez-Rattoni
Long-term memories can undergo destabilization/restabilization processes, collectively called reconsolidation. However, the parameters that trigger memory reconsolidation are poorly understood and are a matter of intense investigation. Particularly, memory retrieval is widely held as requisite to initiate reconsolidation. This assumption makes sense since only relevant cues will induce reconsolidation of a specific memory. However, recent studies show that pharmacological inhibition of retrieval does not avoid memory from undergoing reconsolidation, indicating that memory reconsolidation occurs through a process that can be dissociated from retrieval...
December 21, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/27980072/memory-trace-reactivation-and-behavioral-response-during-retrieval-are-differentially-modulated-by-amygdalar-glutamate-receptors-activity-interaction-between-amygdala-and-insular-cortex
#3
Daniel Osorio-Gómez, Kioko Guzmán-Ramos, Federico Bermúdez-Rattoni
The insular cortex (IC) is required for conditioned taste aversion (CTA) retrieval. However, it remains unknown which cortical neurotransmitters levels are modified upon CTA retrieval. Using in vivo microdialysis, we observed that there were clear elevations in extracellular glutamate, norepinephrine, and dopamine in and around the center of the gustatory zone of the IC during CTA retrieval. Additionally, it has been reported that the amygdala-IC interaction is highly involved in CTA memory establishment. Therefore, we evaluated the effects of infusions of an AMPA receptor antagonist (CNQX) and a NMDA receptor antagonist (APV) into the amygdala on CTA retrieval and IC neurotransmitter levels...
January 2017: Learning & Memory
https://www.readbyqxmd.com/read/27650435/decreased-levels-of-nmda-but-not-ampa-receptors-in-the-lipid-raft-fraction-of-3xtg-ad-model-of-alzheimer-s-disease-relation-to-arc-arg3-1-protein-expression
#4
Jean-Pascal Morin, Sofía Díaz-Cintra, Federico Bermúdez-Rattoni, Ilse Delint-Ramírez
It was recently suggested that alteration in lipid raft composition in Alzheimer's disease may lead to perturbations in neurons signalosome, which may help explain the deficits observed in synaptic plasticity mechanisms and long-term memory impairments in AD models. As a first effort to address this issue, we evaluated lipid-raft contents of distinct NMDA and AMPA receptor subunits in the hippocampus of the 3xTg-AD model of Alzheimer's disease. Our results show that compared to controls, 10 months-old 3xTg-AD mice have diminished levels of NMDA receptors in rafts but not in post-synaptic density or total fractions...
September 17, 2016: Neurochemistry International
https://www.readbyqxmd.com/read/27260351/corrigendum-to-differential-involvement-of-glutamatergic-and-catecholaminergic-activity-within-the-amygdala-during-taste-aversion-retrieval-on-memory-expression-and-updating-behav-brain-res-307-2016-120-125
#5
Daniel Osorio-Gómez, Kioko Guzmán-Ramos, Federico Bermúdez-Rattoni
No abstract text is available yet for this article.
May 31, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27103531/dopaminergic-neurotransmission-dysfunction-induced-by-amyloid-%C3%AE-transforms-cortical-long-term-potentiation-into-long-term-depression-and-produces-memory-impairment
#6
Perla Moreno-Castilla, Luis F Rodriguez-Duran, Kioko Guzman-Ramos, Alejandro Barcenas-Femat, Martha L Escobar, Federico Bermudez-Rattoni
Alzheimer's disease (AD) is a neurodegenerative condition manifested by synaptic dysfunction and memory loss, but the mechanisms underlying synaptic failure are not entirely understood. Although dopamine is a key modulator of synaptic plasticity, dopaminergic neurotransmission dysfunction in AD has mostly been associated to noncognitive symptoms. Thus, we aimed to study the relationship between dopaminergic neurotransmission and synaptic plasticity in AD models. We used a transgenic model of AD (triple-transgenic mouse model of AD) and the administration of exogenous amyloid-β (Aβ) oligomers into wild type mice...
May 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/27063549/neural-ablation-of-the-park10-candidate-plpp3-leads-to-dopaminergic-transmission-deficits-without-neurodegeneration
#7
Sandra Gómez-López, Ana Valeria Martínez-Silva, Teresa Montiel, Daniel Osorio-Gómez, Federico Bermúdez-Rattoni, Lourdes Massieu, Diana Escalante-Alcalde
Parkinson's disease (PD) is a multifactorial neurodegenerative disorder, characterised by the progressive loss of midbrain dopaminergic neurons and a variety of motor symptoms. The gene coding for the phospholipid phosphatase 3, PLPP3 (formerly PPAP2B or LPP3), maps within the PARK10 locus, a region that has been linked with increased risk to late-onset PD. PLPP3 modulates the levels of a range of bioactive lipids controlling fundamental cellular processes within the central nervous system. Here we show that PLPP3 is enriched in astroglial cells of the adult murine ventral midbrain...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27018173/differential-involvement-of-glutamatergic-and-catecholaminergic-activity-within-the-amygdala-during-taste-aversion-retrieval-on-memory-expression-and-updating
#8
Osorio-Gómez Daniel, Guzmán-Ramos Kioko, Bermúdez-Rattoni Federico
During memory retrieval, consolidated memories are expressed and destabilized in order to maintain or update information through a memory reconsolidation process. Despite the key role of the amygdala during memory acquistion and consolidation, the participation of neurotransmitter signals in memory retrieval is poorly understood. Hence, we used conditioned taste aversion and in vivo microdialysis to evaluate changes in glutamate, norepinephrine and dopamine concentrations within the amygdala during memory retrieval...
July 1, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/26836189/spatial-memory-impairment-is-associated-with-intraneural-amyloid-%C3%AE-immunoreactivity-and-dysfunctional-arc-expression-in-the-hippocampal-ca3-region-of-a-transgenic-mouse-model-of-alzheimer-s-disease
#9
Jean-Pascal Morin, Giovanni Cerón-Solano, Giovanna Velázquez-Campos, Gustavo Pacheco-López, Federico Bermúdez-Rattoni, Sofía Díaz-Cintra
Dysfunction of synaptic communication in cortical and hippocampal networks has been suggested as one of the neuropathological hallmarks of the early stages of Alzheimer's disease (AD). Also, several lines of evidence have linked disrupted levels of activity-regulated cytoskeletal associated protein (Arc), an immediate early gene product that plays a central role in synaptic plasticity, with AD "synaptopathy". The mapping of Arc expression patterns in brain networks has been extensively used as a marker of memory-relevant neuronal activity history...
2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/26380114/new-insights-on-retrieval-induced-and-ongoing-memory-consolidation-lessons-from-arc
#10
REVIEW
Jean-Pascal Morin, Kioko Guzmán-Ramos, Federico Bermudez-Rattoni
The mainstream view on the neurobiological mechanisms underlying memory formation states that memory traces reside on the network of cells activated during initial acquisition that becomes active again upon retrieval (reactivation). These activation and reactivation processes have been called "conjunctive trace." This process implies that singular molecular events must occur during acquisition, strengthening the connection between the implicated cells whose synchronous activity must underlie subsequent reactivations...
2015: Neural Plasticity
https://www.readbyqxmd.com/read/25745387/identification-of-age-and-disease-related-alterations-in-circulating-mirnas-in-a-mouse-model-of-alzheimer-s-disease
#11
Sylvia Garza-Manero, Clorinda Arias, Federico Bermúdez-Rattoni, Luis Vaca, Angélica Zepeda
Alzheimer's disease (AD) is a neurodegenerative disorder characterized clinically by the progressive decline of memory and cognition. Histopathologically, two main hallmarks have been identified in AD: amyloid-β peptide extracellular neuritic plaques and neurofibrillary tangles formed by posttranslational modified tau protein. A definitive diagnosis can only be achieved after the post mortem verification of the histological mentioned alterations. Therefore, the development of biomarkers that allow an early diagnosis and/or predict disease progression is imperative...
2015: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/25698604/effects-of-glutamate-and-its-metabotropic-receptors-class-1-antagonist-in-appetitive-taste-memory-formation
#12
Leticia Ramírez-Lugo, Sergio Zavala-Vega, Rodrigo Pedroza-Llinas, Luis Núñez-Jaramillo, Federico Bermúdez-Rattoni
Cortical glutamatergic activity is known to be important for memory formation in different learning tasks. For example, glutamate activity in the insular cortex plays an important role in aversive taste memory formation by signaling the unconditioned stimulus. However, the role of glutamate in the insular cortex in appetitive taste learning has remained poorly studied. Therefore, we considered the function of glutamate in attenuation of neophobia, a model of appetitive taste recognition memory. For this purpose, we performed infusions of vehicle, glutamate, a specific mGluR1 antagonist (AIDA) or a combination of glutamate and AIDA at 0 or 30 min, and glutamate or vehicle at 60 min after novel saccharin consumption...
May 1, 2015: Behavioural Brain Research
https://www.readbyqxmd.com/read/25300672/differential-role-of-insular-cortex-muscarinic-and-nmda-receptors-in-one-trial-appetitive-taste-learning
#13
Shauna L Parkes, Vanesa De la Cruz, Federico Bermúdez-Rattoni, Etienne Coutureau, Guillaume Ferreira
Our current understanding of the neurobiology of taste learning and memory has been greatly facilitated by the use of a reliable behavioural model, conditioned taste aversion (CTA). This model has revealed that the insular cortex (IC), specifically muscarinic and N-methyl-d-aspartate (NMDA) receptor activation in the IC, is critical for the formation of aversive taste memories. In contrast, current models of appetitive taste learning are less adequate, relying on the use of neophobic tastes (attenuation of neophobia) or on the integration of appetitive and aversive taste memories (latent inhibition of CTA)...
December 2014: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/25192636/consolidation-and-reconsolidation-of-object-recognition-memory
#14
REVIEW
Israela Balderas, Carlos J Rodriguez-Ortiz, Federico Bermudez-Rattoni
In the first part of this review, we will present evidence showing a functional double dissociation between different structures of the medial temporal lobe in the consolidation of object and object-in-context recognition memory. In addition, we will provide evidence to support this differential participation through protein synthesis inhibitors and neurotransmitters antagonists and agonists. This evidence points out that the perirhinal, prefrontal and insular cortices consolidate the information of individual stimuli, i...
May 15, 2015: Behavioural Brain Research
https://www.readbyqxmd.com/read/25128536/retrieval-is-not-necessary-to-trigger-reconsolidation-of-object-recognition-memory-in-the-perirhinal-cortex
#15
Marianela Santoyo-Zedillo, Carlos J Rodriguez-Ortiz, Gianfranco Chavez-Marchetta, Federico Bermudez-Rattoni, Israela Balderas
Memory retrieval has been considered as requisite to initiate memory reconsolidation; however, some studies indicate that blocking retrieval does not prevent memory from undergoing reconsolidation. Since N-methyl-D-aspartate (NMDA) and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) glutamate receptors in the perirhinal cortex have been involved in object recognition memory formation, the present study evaluated whether retrieval and reconsolidation are independent processes by manipulating these glutamate receptors...
September 2014: Learning & Memory
https://www.readbyqxmd.com/read/24685633/age-dependent-increment-of-hydroxymethylation-in-the-brain-cortex-in-the-triple-transgenic-mouse-model-of-alzheimer-s-disease
#16
Carla Cadena-del-Castillo, Christian Valdes-Quezada, Francisco Carmona-Aldana, Clorinda Arias, Federico Bermúdez-Rattoni, Félix Recillas-Targa
Alzheimer's disease (AD) is a complex disorder whose etiology is associated with environmental and genetic factors. Recently there have been several attempts to analyze the role of epigenetic alterations in the origin and progression of this neurodegenerative condition. To evaluate the potential participation of the methylation status of the genome that may contribute to AD progression, we have studied the levels and distribution of the 5-methylcytosine and 5-hydroxymethylcytosine in different brain regions at different ages...
2014: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/24631645/role-of-glutamate-receptors-of-central-and-basolateral-amygdala-nuclei-on-retrieval-and-reconsolidation-of-taste-aversive-memory
#17
Paola Garcia-Delatorre, Consuelo Pérez-Sánchez, Kioko Guzmán-Ramos, Federico Bermúdez-Rattoni
There are a number of experiments showing an important involvement of amygdala N-methyl-d-aspartate (NMDA) glutamate receptors on consolidation of conditioned taste aversion (CTA) memory. Interestingly, recent evidence has shown that α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) glutamate receptors are particularly involved in CTA retrieval. Memory reconsolidation has been proposed as a destabilization and re-stabilization process induced by memory reactivation. We have recently suggested that reconsolidation could be enabled in the absence of retrieval...
May 2014: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/24406466/the-forgotten-insular-cortex-its-role-on-recognition-memory-formation
#18
REVIEW
Federico Bermudez-Rattoni
For a long time, the insular cortex (IC) has been related with taste physiology and taste memory processes in animal studies. Recently, the role of the IC has been highlighted by findings involving the IC in non-taste memory formation in both human and animal studies. Recognition memory is based on the ability to assess the familiarity of a previously encountered stimulus, and it is considered a form of declarative memory. In this work, I am proposing that the IC and its related circuitry are highly involved in the conversion of novel to familiar stimulus for both object and taste recognition memory...
March 2014: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/24042035/retrieval-and-reconsolidation-of-object-recognition-memory-are-independent-processes-in-the-perirhinal-cortex
#19
I Balderas, C J Rodriguez-Ortiz, F Bermudez-Rattoni
Reconsolidation refers to the destabilization/re-stabilization process upon memory reactivation. However, the parameters needed to induce reconsolidation remain unclear. Here we evaluated the capacity of memory retrieval to induce reconsolidation of object recognition memory in rats. To assess whether retrieval is indispensable to trigger reconsolidation, we injected muscimol in the perirhinal cortex to block retrieval, and anisomycin (ani) to impede reconsolidation. We observed that ani impaired reconsolidation in the absence of retrieval...
December 3, 2013: Neuroscience
https://www.readbyqxmd.com/read/23674387/dopamine-d1-receptor-activity-modulates-object-recognition-memory-consolidation-in-the-perirhinal-cortex-but-not-in-the-hippocampus
#20
Israela Balderas, Perla Moreno-Castilla, Federico Bermudez-Rattoni
It has been proposed that distributed neuronal networks in the medial temporal lobe process different characteristics of a recognition event; the hippocampus has been associated with contextual recollection while the perirhinal cortex has been linked with familiarity. Here we show that D1 dopamine receptor activity in these two structures participates differentially in object recognition memory consolidation. The D1 receptor antagonist SCH23390 was infused bilaterally 15 min before a 5 min sample phase in either rats' perirhinal cortex or dorsal hippocampus, and they were tested 90 min for short-term memory or 24 h later for long-term memory...
October 2013: Hippocampus
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