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Hippocampus and working memory

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https://www.readbyqxmd.com/read/27908700/sex-dependent-effects-of-developmental-exposure-to-different-pesticides-on-spatial-learning-the-role-of-induced-neuroinflammation-in-the-hippocampus
#1
Belén Gómez-Giménez, Marta Llansola, Vicente Hernández-Rabaza, Andrea Cabrera-Pastor, Michele Malaguarnera, Ana Agusti, Vicente Felipo
The use of pesticides has been associated with impaired neurodevelopment in children. The aims of this work were to assess: 1) the effects on spatial learning of developmental exposure to pesticides 2) if the effects are sex-dependent and 3) if hippocampal neuroinflammation is associated with the impairment of spatial learning. We analyzed the effects of developmental exposure to four pesticides: chlorpyrifos, carbaryl, endosulfan and cypermethrin. Exposure was from gestational day 7 to post-natal day 21 and spatial learning and memory was assessed when the rats were young adults...
November 28, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27896065/analysis-of-ageing-associated-grey-matter-volume-in-patients-with-multiple-sclerosis-shows-excess-atrophy-in-subcortical-regions
#2
Courtney A Bishop, Rexford D Newbould, Jean Sz Lee, Lesley Honeyfield, Rebecca Quest, Alessandro Colasanti, Rehiana Ali, Miriam Mattoscio, Antonio Cortese, Richard Nicholas, Paul M Matthews, Paolo A Muraro, Adam D Waldman
Age of onset in multiple sclerosis (MS) exerts an influence on the course of disease. This study examined whether global and regional brain volumes differed between "younger" and "older" onset MS subjects who were matched for short disease duration, mean 1.9 years and burden as measured by the MS Severity Score and relapses. 21 younger-onset MS subjects (age 30.4 ± 3.2 years) were compared with 17 older-onset (age 48.7 ± 3.3 years) as well as age-matched controls (n = 31, 31.9 ± 3.5 years and n = 21, 47...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27889579/protective-effects-of-high-tryptophan-diet-on-aging-induced-passive-avoidance-impairment-and-hippocampal-apoptosis
#3
Giuseppe Musumeci, Paola Castrogiovanni, Marta Anna Szychlinska, Rosa Imbesi, Carla Loreto, Sergio Castorina, Salvatore Giunta
In our previous work we have shown that L-Tryptophan (TrP) enriched diet prevents the age-induced decline of hippocampal Serotonin (5-HT) production. Considering that loss or reduction in 5-HT neurotransmission may contribute to age-related cognitive decline, here we have investigated the effect of such diet on passive avoidance (PA) behavior, cell death, pro- and anti- apoptotic molecules (BAX, Bcl-2 and Caspase-3) and an important transcription factor involved in synaptic plasticity and memory (CREB). The increase in 5-HT neurotransmission in the Hippocampus (Hp) of aged rats was induced by 1 month of high TrP administration...
November 23, 2016: Brain Research Bulletin
https://www.readbyqxmd.com/read/27881773/novel-roles-for-the-insulin-regulated-glucose-transporter-4-in-hippocampally-dependent-memory
#4
Jiah Pearson-Leary, Ewan C McNay
: The insulin-regulated glucose transporter-4 (GluT4) is critical for insulin- and contractile-mediated glucose uptake in skeletal muscle. GluT4 is also expressed in some hippocampal neurons, but its functional role in the brain is unclear. Several established molecular modulators of memory processing regulate hippocampal GluT4 trafficking and hippocampal memory formation is limited by both glucose metabolism and insulin signaling. Therefore, we hypothesized that hippocampal GluT4 might be involved in memory processes...
November 23, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27881080/genotypic-differences-in-intruder-evoked-immediate-early-gene-activation-in-male-but-not-female-vasopressin-1b-receptor-knockout-mice
#5
Shannah K Witchey, Erica L Stevenson, Heather K Caldwell
BACKGROUND: The neuropeptide arginine vasopressin (Avp) modulates social behaviors via its two centrally expressed receptors, the Avp 1a receptor and the Avp 1b receptor (Avpr1b). Recent work suggests that, at least in mice, Avp signaling through Avpr1b within the CA2 region of the hippocampus is critical for normal aggressive behaviors and social recognition memory. However, this brain area is just one part of a larger neural circuit that is likely to be impacted in Avpr1b knockout (-/-) mice...
November 24, 2016: BMC Neuroscience
https://www.readbyqxmd.com/read/27880004/causal-relationships-among-neurons-of-the-nucleus-incertus-and-the-hippocampal-theta-activity-in-the-rat
#6
Sergio Martínez-Bellver, Ana Cervera-Ferri, Aina Luque-García, Joana Martínez-Ricós, Alfonso Valverde-Navarro, Manuel Bataller, Juan Guerrero, Vicent Teruel-Marti
In recent years, a body of evidence has shown that the nucleus incertus (NI), in the dorsal tegmental pons, is a key node of the brainstem circuitry involved in hippocampal theta rhythmicity. Ascending reticular brainstem system activation evokes hippocampal theta rhythm with coupled neuronal activity in the NI. In a recent paper, we showed three populations of neurons in the NI with differential firings during hippocampal theta activation. The objective of this work is to better evaluate the causal relationship between the activity of NI neurons and the hippocampus during theta activation in order to further understand the role of the NI in the theta network...
November 23, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27874237/tactile-stimulation-during-different-developmental-periods-modifies-hippocampal-bdnf-and-gr-affecting-memory-and-behavior-in-adult-rats
#7
Caren T D Antoniazzi, Vinícia G Metz, Karine Roversi, Daniele L Freitas, Luciana T Vey, Verônica T Dias, Hecson J Segat, Marta M M F Duarte, Marilise Escobar Bürger
Recent studies have shown that tactile stimulation (TS) in pups is able to prevent and/or minimize fear, anxiety behaviors, and addiction to psychostimulant drugs in adult rats. In these studies, animals have been exposed to handling from postnatal day (PND) 1 to 21. The present study was designed to precisely establish which period of preweaning development has a greater influence of TS on neuronal development. After birth, male pups were exposed to TS from PND1 to 7, PND8 to 14, and PND15 to 21. In adulthood, the different periods of postnatal TS were assessed through behavioral, biochemical and molecular assessments...
November 22, 2016: Hippocampus
https://www.readbyqxmd.com/read/27872583/ablation-of-sphingosine-1-phosphate-receptor-subtype-3-impairs-hippocampal-neuron-excitability-in-vitro-and-spatial-working-memory-in-vivo
#8
Daniela Weth-Malsch, Michiel Langeslag, Dimitra Beroukas, Luca Zangrandi, Iris Kastenberger, Serena Quarta, Philipp Malsch, Theodora Kalpachidou, Christoph Schwarzer, Richard L Proia, Rainer V Haberberger, Michaela Kress
Understanding the role of the bioactive lipid mediator sphingosine 1-phosphate (S1P) within the central nervous system has recently gained more and more attention, as it has been connected to major diseases such as multiple sclerosis and Alzheimer's disease. Even though much data about the functions of the five S1P receptors has been collected for other organ systems, we still lack a complete understanding for their specific roles, in particular within the brain. Therefore, it was the aim of this study to further elucidate the role of S1P receptor subtype 3 (S1P3) in vivo and in vitro with a special focus on the hippocampus...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27865801/long-term-cognitive-emotional-and-neurogenic-alterations-induced-by-alcohol-and-methamphetamine-exposure-in-adolescent-rats
#9
David Loxton, Juan J Canales
A high proportion of young methamphetamine (MA) users simultaneously consume alcohol. However, the potential neurological and behavioural alterations induced by such a drug combination have not been systematically examined. We studied in adolescent rats the long-term effects of alcohol, MA, and alcohol and MA combined on anxiety-like behaviour, memory, and neurogenesis in the adult hippocampus. Rats received saline, ethanol (ETOH, 1.5g/kg), MA (MA, 2mg/kg), or ethanol and MA combined (ETHOH-MA, 1.5g/kg ethanol plus 2mg/kg MA) via oral gavage, once daily for 5 consecutive days...
November 16, 2016: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/27862185/short-term-exposure-to-enriched-environment-rescues-chronic-stress-induced-impaired-hippocampal-synaptic-plasticity-anxiety-and-memory-deficits
#10
VenkannaRao Bhagya, Bettadapura N Srikumar, Jayagopalan Veena, Byrathnahalli S Shankaranarayana Rao
Exposure to prolonged stress results in structural and functional alterations in the hippocampus including reduced long-term potentiation (LTP), neurogenesis, spatial learning and working memory impairments, and enhanced anxiety-like behavior. On the other hand, enriched environment (EE) has beneficial effects on hippocampal structure and function, such as improved memory, increased hippocampal neurogenesis, and progressive synaptic plasticity. It is unclear whether exposure to short-term EE for 10 days can overcome restraint stress-induced cognitive deficits and impaired hippocampal plasticity...
November 16, 2016: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27853420/reducing-peripheral-inflammation-with-infliximab-reduces-neuroinflammation-and-improves-cognition-in-rats-with-hepatic-encephalopathy
#11
Sherry Dadsetan, Tiziano Balzano, Jerónimo Forteza, Andrea Cabrera-Pastor, Lucas Taoro-Gonzalez, Vicente Hernandez-Rabaza, Sara Gil-Perotín, Laura Cubas-Núñez, José-Manuel García-Verdugo, Ana Agusti, Marta Llansola, Vicente Felipo
Inflammation contributes to cognitive impairment in patients with hepatic encephalopathy (HE). However, the process by which peripheral inflammation results in cognitive impairment remains unclear. In animal models, neuroinflammation and altered neurotransmission mediate cognitive impairment. Taking into account these data, we hypothesized that in rats with HE: (1) peripheral inflammation is a main contributor to neuroinflammation; (2) neuroinflammation in hippocampus impairs spatial learning by altering AMPA and/or NMDA receptors membrane expression; (3) reducing peripheral inflammation with infliximab (anti-TNF-a) would improve spatial learning; (4) this would be associated with reduced neuroinflammation and normalization of the membrane expression of glutamate receptors...
2016: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/27848935/distinct-roles-of-creb-within-the-ventral-and-dorsal-hippocampus-in-mediating-nicotine-withdrawal-phenotypes
#12
Miranda Fisher, Rachel LeMalefant, Luyi Zhou, Gavin Huang, Jill Turner
Addiction to nicotine and the inability to quit smoking are influenced by genetic factors, emphasizing the importance of understanding how genes and drugs of abuse mechanistically impact each other. One well-characterized protein responsible for regulating both response to drugs and gene expression is the transcription factor CREB. Previous work indicates that hippocampal specific alterations in CREB signaling and synaptic plasticity may underlie certain nicotine withdrawal phenotypes. However, the structure of the hippocampus possesses dorsal and ventral sub-regions, each differing in behavioral, anatomic and gene expression characteristics...
November 16, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27848149/midlife-managerial-experience-is-linked-to-late-life-hippocampal-morphology-and-function
#13
C Suo, N Gates, M Fiatarone Singh, N Saigal, G C Wilson, J Meiklejohn, P Sachdev, H Brodaty, W Wen, N Singh, B T Baune, M Baker, N Foroughi, Y Wang, Michael J Valenzuela
An active cognitive lifestyle has been suggested to have a protective role in the long-term maintenance of cognition. Amongst healthy older adults, more managerial or supervisory experiences in midlife are linked to a slower hippocampal atrophy rate in late life. Yet whether similar links exist in individuals with Mild Cognitive Impairment (MCI) is not known, nor whether these differences have any functional implications. 68 volunteers from the Sydney SMART Trial, diagnosed with non-amnestic MCI, were divided into high and low managerial experience (HME/LME) during their working life...
November 15, 2016: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/27845401/neuroprotection-mediated-through-glun2c-containing-n-methyl-d-aspartate-nmda-receptors-following-ischemia
#14
Connie Chung, John D Marson, Quan-Guang Zhang, Jimok Kim, Wei-Hua Wu, Darrell W Brann, Bo-Shiun Chen
Post-ischemic activation of NMDA receptors (NMDARs) has been linked to NMDAR subunit-specific signaling that mediates pro-survival or pro-death activity. Although extensive studies have been performed to characterize the role of GluN2A and GluN2B following ischemia, there is less understanding regarding the regulation of GluN2C. Here, we show that GluN2C expression is increased in acute hippocampal slices in response to ischemia. Strikingly, GluN2C knockout mice, following global cerebral ischemia, exhibit greater neuronal death in the CA1 area of the hippocampus and reduced spatial working memory compared to wild-type mice...
November 15, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27845295/effects-of-medial-septal-lesion-on-hippocampal-extracellular-glutamate-and-gaba-levels-during-spatial-alternation-testing
#15
S Mataradze, T Naneishvili, M Sephashvili, D Mikeladze, M Dashniani
The present study investigated spatial working memory assessed in spontaneous alternation (SA) task and hippocampal glutamate and GABA release prior to, during, and after SA test in sham-operated and electrolytic medial septal (MS) lesioned rats. Also, have been investigated the effects of MS lesion on KCl-stimulated release of glutamate and GABA in the hippocampus. Behavioral study showed that electrolytic lesion of MS significantly impaired SA performance. Although both groups of animals had an insignificant rise in their respective hippocampal glutamate efflux during the SA, the rise of MS lesioned animals was blunted when compared with control animals...
October 2016: Georgian Medical News
https://www.readbyqxmd.com/read/27842701/the-relationship-between-eye-movements-and-subsequent-recognition-evidence-from-individual-differences-and-amnesia
#16
Rosanna K Olsen, Vinoja Sebanayagam, Yunjo Lee, Morris Moscovitch, Cheryl L Grady, R Shayna Rosenbaum, Jennifer D Ryan
There is consistent agreement regarding the positive relationship between cumulative eye movement sampling and subsequent recognition, but the role of the hippocampus in this sampling behavior is currently unknown. It is also unclear whether the eye movement repetition effect, i.e., fewer fixations to repeated, compared to novel, stimuli, depends on explicit recognition and/or an intact hippocampal system. We investigated the relationship between cumulative sampling, the eye movement repetition effect, subsequent memory, and the hippocampal system...
October 22, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/27834391/hippocampal-gabab-1a-receptors-constrain-generalized-contextual-fear
#17
Joseph F Lynch, Patrick Winiecki, T Lee Gilman, Jordan M Adkins, Aaron M Jasnow
Many anxiety disorders are characterized by generalization of fear responses to neutral or ambiguous stimuli. Therefore, a comprehensive understanding of the mechanisms contributing to generalized fear is essential for formulating successful treatments for anxiety disorders. Previous research shows that GABA-mediated presynaptic inhibition plays a critical role in cued fear generalization, as animals with genetically deleted presynaptic GABAB(1a) receptors cannot discriminate between CS+ and CS- tones. Work from our lab has further identified that GABAB(1a) receptors are necessary for maintaining contextual memory precision, thereby constraining generalized contextual fear...
November 11, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27815990/low-level-laser-therapy-for-beta-amyloid-toxicity-in-rat-hippocampus
#18
Yujiao Lu, Ruimin Wang, Yan Dong, Donovan Tucker, Ningjun Zhao, Md Ejaz Ahmed, Ling Zhu, Timon Cheng-Yi Liu, Robert M Cohen, Quanguang Zhang
Beta amyloid (Aβ) is well accepted to play a central role in the pathogenesis of Alzheimer's disease (AD). The present work evaluated the therapeutic effects of low-level laser irradiation (LLI) on Aβ-induced neurotoxicity in rat hippocampus. Aβ 1-42 was injected bilaterally to the hippocampus CA1 region of adult male rats, and 2-minute daily LLI treatment was applied transcranially after Aβ injection for 5 consecutive days. LLI treatment suppressed Aβ-induced hippocampal neurodegeneration and long-term spatial and recognition memory impairments...
October 11, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/27814958/expanding-the-language-network-direct-contributions-from-the-hippocampus
#19
Natalie V Covington, Melissa C Duff
New research suggests that the same hippocampal computations used in support of memory are also used for language processing, providing direct neurophysiological evidence of a shared neural mechanism for memory and language. This work expands classic memory and language models and represents a new opportunity for studying the memory-language interface.
December 2016: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/27802831/persisting-neurobehavioral-effects-of-developmental-copper-exposure-in-wildtype-and-metallothionein-1-and-2-knockout-mice
#20
Ann Petro, Hannah G Sexton, Caroline Miranda, Anit Rastogi, Jonathan H Freedman, Edward D Levin
BACKGROUND: Metallothioneins (MT) are small proteins, which are crucial for the distribution of heavy and transition metals. Previously, we found in mice that knockout of MT 1 and 2 genes (MTKO) impaired spatial learning and potentiated the learning impairment caused by developmental mercury exposure. The current study examined the neurocognitive and neurochemical effects of MTKO with the developmental copper (Cu) supplementation. METHODS: Wildtype (WT) and MTKO mice were given supplemental Cu (0, 10 or 50 mg/l) in their drinking water during gestation and until weaning...
November 2, 2016: BMC Pharmacology & Toxicology
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