keyword
MENU ▼
Read by QxMD icon Read
search

Hippocampal subregion

keyword
https://www.readbyqxmd.com/read/29218403/the-storage-and-recall-of-memories-in-the-hippocampo-cortical-system
#1
REVIEW
Edmund T Rolls
A quantitative computational theory of the operation of the hippocampus as an episodic memory system is described. The CA3 system operates as a single attractor or autoassociation network (1) to enable rapid one-trial associations between any spatial location (place in rodents or spatial view in primates) and an object or reward and (2) to provide for completion of the whole memory during recall from any part. The theory is extended to associations between time and object or reward to implement temporal order memory, which is also important in episodic memory...
December 7, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/29201002/a-comparison-of-different-slicing-planes-in-preservation-of-major-hippocampal-pathway-fibers-in-the-mouse
#2
Guoxiang Xiong, Hannah Metheny, Brian N Johnson, Akiva S Cohen
The hippocampus plays a critical role in learning and memory and higher cognitive functions, and its dysfunction has been implicated in various neuropathological disorders. Electrophysiological recording undertaken in live brain slices is one of the most powerful tools for investigating hippocampal cellular and network activities. The plane for cutting the slices determines which afferent and/or efferent connections are best preserved, and there are three commonly used slices: hippocampal-entorhinal cortex (HEC), coronal and transverse...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29186681/gamma-oscillations-in-rat-hippocampal-subregions-dentate-gyrus-ca3-ca1-and-subiculum-underlie-associative-memory-encoding
#3
John B Trimper, Claire R Galloway, Andrew C Jones, Kaavya Mandi, Joseph R Manns
Neuronal oscillations in the rat hippocampus relate to both memory and locomotion, raising the question of how these cognitive and behavioral correlates interact to determine the oscillatory network state of this region. Here, rats freely locomoted while performing an object-location task designed to test hippocampus-dependent spatial associative memory. Rhythmic activity in theta, beta, slow gamma, and fast gamma frequency ranges were observed in both action potentials and local field potentials (LFPs) across four main hippocampal subregions...
November 28, 2017: Cell Reports
https://www.readbyqxmd.com/read/29171926/episodic-autobiographical-memory-is-associated-with-variation-in-the-size-of-hippocampal-subregions
#4
Daniela J Palombo, Agnes Bacopulos, Robert S C Amaral, Rosanna K Olsen, Rebecca M Todd, Adam K Anderson, Brian Levine
Striking individual differences exist in the human capacity to recollect past events, yet, little is known about the neural correlates of such individual differences. Studies investigating hippocampal volume in relation to individual differences in laboratory measures of episodic memory in young adults suggest that whole hippocampal volume is unrelated (or even negatively associated) with episodic memory. However, anatomical and functional specialization across hippocampal subregions suggests that individual differences in episodic memory may be linked to particular hippocampal subregions, as opposed to whole hippocampal volume...
November 24, 2017: Hippocampus
https://www.readbyqxmd.com/read/29167810/the-pre-parasubiculum-a-hippocampal-hub-for-scene-based-cognition
#5
REVIEW
Marshall A Dalton, Eleanor A Maguire
Internal representations of the world in the form of spatially coherent scenes have been linked with cognitive functions including episodic memory, navigation and imagining the future. In human neuroimaging studies, a specific hippocampal subregion, the pre/parasubiculum, is consistently engaged during scene-based cognition. Here we review recent evidence to consider why this might be the case. We note that the pre/parasubiculum is a primary target of the parieto-medial temporal processing pathway, it receives integrated information from foveal and peripheral visual inputs and it is contiguous with the retrosplenial cortex...
October 2017: Current Opinion in Behavioral Sciences
https://www.readbyqxmd.com/read/29159960/mapping-the-structural-and-functional-network-architecture-of-the-medial-temporal-lobe-using-7t-mri
#6
Preya Shah, Danielle S Bassett, Laura E M Wisse, John A Detre, Joel M Stein, Paul A Yushkevich, Russell T Shinohara, John B Pluta, Elijah Valenciano, Molly Daffner, David A Wolk, Mark A Elliott, Brian Litt, Kathryn A Davis, Sandhitsu R Das
Medial temporal lobe (MTL) subregions play integral roles in memory function and are differentially affected in various neurological and psychiatric disorders. The ability to structurally and functionally characterize these subregions may be important to understanding MTL physiology and diagnosing diseases involving the MTL. In this study, we characterized network architecture of the MTL in healthy subjects (n = 31) using both resting state functional MRI and MTL-focused T2-weighted structural MRI at 7 tesla...
November 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29150979/anterior-thalamic-nuclei-lesions-have-a-greater-impact-than-mammillothalamic-tract-lesions-on-the-extended-hippocampal-system
#7
Brook A L Perry, Stephanie A Mercer, Sophie C Barnett, Jungah Lee, John C Dalrymple-Alford
The anterior thalamic nuclei (ATN), mammillary bodies and their interconnecting fiber tract, the mammillothalamic tract (MTT), are important components of an extended hippocampal circuit for episodic memory. In humans, damage to the MTT or ATN in many disorders is associated with severe anterograde amnesia and it is assumed that their influence on memory is functionally equivalent. The relative influence of these two structures on memory has not, however, been assessed explicitly. Here, a direct comparison found that only ATN lesions impaired spatial reference memory in rats...
November 18, 2017: Hippocampus
https://www.readbyqxmd.com/read/29115458/effects-of-long%C3%A2-term-scopolamine-treatment-on-cognitive-deficits-and-calcium-binding-proteins-immunoreactivities-in-the-mouse-hippocampus
#8
Ji Hyeon Ahn, Bai Hui Chen, Bing Chun Yan, Joon Ha Park, Il Jun Kang, Tae-Kyeong Lee, Jeong Hwi Cho, Bich-Na Shin, Jae-Chul Lee, Yong Hwan Jeon, Seongkweon Hong, Young Joo Lee, Soo Young Choi, Moo-Ho Won
GABAergic projections terminate on numerous hippocampal interneurons containing calcium binding proteins (CBPs), including calbindin D‑28k (CB), calretinin (CR) and parvalbumin (PV). Memory deficits and expression levels of CB, CR, and PV were examined in the hippocampal subregions following systemic scopolamine (Scop; 1 mg/kg) treatment for 4 weeks in mice. Scop treatment induced significant memory deficits from 1 week after Scop treatment. CB, CR and PV immunoreactivities distributions were in hippocampal subregions [CA1 and CA3 regions, and the dentate gyrus (DG)]...
October 27, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29113959/age-related-epigenetic-changes-in-hippocampal-subregions-of-four-animal-models-of-alzheimer-s-disease
#9
Roy Lardenoije, Daniël L A van den Hove, Monique Havermans, Anne van Casteren, Kevin X Le, Roberta Palmour, Cynthia A Lemere, Bart P F Rutten
Both aging and Alzheimer's disease (AD) are associated with widespread epigenetic changes, with most evidence suggesting global hypomethylation in AD. It is, however, unclear how these age-related epigenetic changes are linked to molecular aberrations as expressed in animal models of AD. Here, we investigated age-related changes of epigenetic markers of DNA methylation and hydroxymethylation in a range of animal models of AD, and their correlations with amyloid plaque load. Three transgenic mouse models, including the J20, APP/PS1dE9 and 3xTg-AD models, as well as Caribbean vervets (a non-transgenic non-human primate model of AD) were investigated...
November 4, 2017: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/29094314/volumetric-changes-in-hippocampal-subregions-and-memory-performance-in-mesial-temporal-lobe-epilepsy-with-hippocampal-sclerosis
#10
Caihong Ji, Lujia Zhu, Cong Chen, Shuang Wang, Leilei Zheng, Hong Li
In the present study we explored the different patterns of volumetric atrophy in hippocampal subregions of patients with left and right mesial temporal lobe epilepsy with hippocampal sclerosis (TLE-HS). Meanwhile, the memory impairment patterns in Chinese-speaking TLE-HS patients and potential influencing factors were also determined. TLE-HS patients (21 left and 17 right) and 21 healthy controls were recruited to complete T2-weighted imaging and verbal/nonverbal memory assessment. The results showed that both left and right TLE-HS patients had overall reduced hippocampal subregion volumes on the sclerotic side, and cornu ammonis sectors (CA1) exhibited maximum atrophy...
November 1, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/29080472/the-expression-of-g-protein-coupled-receptor-kinase-5-and-its-interaction-with-dendritic-marker-microtubule-associated-protein-2-after-status-epilepticus
#11
Xiangchang Zeng, Siyu Chen, Qing Gao, Wenjing Zong, Dejian Jiang, Guirong Zeng, Luping Zhou, Lulu Chen, Wei Luo, Jian Xiao, Bo Xiao, Dongsheng Ouyang, Kai Hu
OBJECTIVE: Acute seizures induced dendritic formation and synaptogenesis promotes aberrant circuitry development and further aggravates underlying conditions towards chronic epilepsy. The G protein-coupled receptor kinase-5 (GRK5) served as a key modulator in neurogenesis and the establishment of functional neuronal circuitry. This included dendritic development, as its dysfunction could cause different central nervous system disorders, including Alzheimer's disease. However, the involvement of GRK5 in the progression of epilepsy remains unclear...
October 13, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29069439/2-45%C3%A2-ghz-microwave-radiation-impairs-hippocampal-learning-and-spatial-memory-involvement-of-local-stress-mechanism-induced-suppression-of-iglur-erk-creb-signaling
#12
Saba Shahin, Somanshu Banerjee, Vivek Swarup, Surya Pal Singh, Chandra Mohini Chaturvedi
Microwave (MW) radiation induced oxidative stress reduces dendritic arborization, spine density and number of hippocampal pyramidal neurons and hence, impair learning and spatial memory through p53-dependent/independent apoptosis of hippocampal neuronal and non-neuronal cells. However, the mechanisms responsible for MW radiation induced impairment in memory formation remains still unknown. Present study elucidates the effect of short (15 days) and long-term (30 and 60 days) low level 2.45 GHz MW radiation induced local stress on the hippocampal spatial memory formation pathway in adult male mice...
October 23, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29067330/differential-medial-temporal-lobe-morphometric-predictors-of-item-and-relational-encoded-memories-in-healthy-individuals-and-in-individuals-with-mild-cognitive-impairment-and-alzheimer-s-disease
#13
Jesus J Gomar, J Daniel Ragland, Aziz M Uluğ, Amber Sousa, Edward D Huey, Concepcion Conejero-Goldberg, Peter Davies, Terry E Goldberg
INTRODUCTION: Episodic memory processes are supported by different subregions of the medial temporal lobe (MTL). In contrast to a unitary model of memory recognition supported solely by the hippocampus, a current model suggests that item encoding engages perirhinal cortex, whereas relational encoding engages parahippocampal cortex and the hippocampus. However, this model has not been examined in the context of aging, neurodegeneration, and MTL morphometrics. METHODS: Forty-four healthy subjects (HSs) and 18 cognitively impaired subjects (nine mild cognitive impairment [MCI] and nine Alzheimer's disease [AD] patients) were assessed with the relational and item-specific encoding task (RISE) and underwent 3T magnetic resonance imaging...
June 2017: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/29065603/safety-of-the-transcranial-focal-electrical-stimulation-via-tripolar-concentric-ring-electrodes-for-hippocampal-ca3-subregion-neurons-in-rats
#14
Samuel Mucio-Ramírez, Oleksandr Makeyev
Epilepsy is a neurological disorder that affects approximately one percent of the world population. Noninvasive electrical brain stimulation via tripolar concentric ring electrodes has been proposed as an alternative/complementary therapy for seizure control. Previous results suggest its efficacy attenuating acute seizures in penicillin, pilocarpine-induced status epilepticus, and pentylenetetrazole-induced rat seizure models and its safety for the rat scalp, cortical integrity, and memory formation. In this study, neuronal counting was used to assess possible tissue damage in rats (n = 36) due to the single dose or five doses (given every 24 hours) of stimulation on hippocampal CA3 subregion neurons 24 hours, one week, and one month after the last stimulation dose...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29064725/%C3%AE-2-adrenoceptor-ir-neurons-density-changes-after-single-dose-of-clonidine-and-yohimbine-administration-in-the-hippocampus-of-male-rat
#15
M Jahanshahi, E Nikmahzar, L Elyasi, F Babakordi, E Hooshmand
OBJECTIVE: Despite the important role of α2-adrenoceptors in pain modulation processes, the impact of administration of α2-adrenoceptor agonist and antagonist on density of hippocampal α2-adrenoceptor-immunoreative neurons has not been investigated. Therefore, we aimed to determine the effect of single doses of clonidine and yohimbine on the density of α2-adrenoceptorimmunoreactive neurons in rat hippocampus. MATERIALS AND METHODS: Adult male Wistar rats received a single dose of clonidine (0...
October 24, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29046699/age-dependent-differences-in-myelin-basic-protein-expression-in-the-hippocampus-of-young-adult-and-aged-gerbils
#16
Ji Hyeon Ahn, Tae-Kyeong Lee, Joon Ha Park, Jeong Hwi Cho, In Hye Kim, Jae Chul Lee, Seongkweon Hong, Yong Hwan Jeon, Il Jun Kang, Young Joo Lee, Moo-Ho Won, Choong-Hyun Lee
Myelin degeneration is one of the characteristics of aging and degenerative diseases. This study investigated age-related alterations in expression of myelin basic protein (MBP) in the hippocampal subregions (dentate gyrus, CA2/3 and CA1 areas) of gerbils of various ages; young (1 month), adult (6 months) and aged (24 months), using western blot and immunohistochemistry. Western blot results showed tendencies of age-related reductions of MBP levels. MBP immunoreactivity was significantly decreased with age in synaptic sites of trisynaptic loops, perforant paths, mossy fibers, and Schaffer collaterals...
September 2017: Laboratory Animal Research
https://www.readbyqxmd.com/read/29046322/pumilio2-deficient-mice-show-a-predisposition-for-epilepsy
#17
Philipp Follwaczny, Rico Schieweck, Therese Riedemann, Antonia Demleitner, Tobias Straub, Anna H Klemm, Martin Bilban, Bernd Sutor, Bastian Popper, Michael A Kiebler
Epilepsy is a neurological disease that is caused by abnormal hypersynchronous activities of neuronal ensembles leading to recurrent and spontaneous seizures in human patients. Enhanced neuronal excitability and a high level of synchrony between neurons seem to trigger these spontaneous seizures. The molecular mechanisms, however, regarding the development of neuronal hyperexcitability and maintenance of epilepsy are still poorly understood. Here, we show that pumilio RNA-binding family member 2 (Pumilio2; Pum2) plays a role in the regulation of excitability in hippocampal neurons of weaned and 5-month-old male mice...
November 1, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29023704/gabaa-receptor-subunits-in-the-human-amygdala-and-hippocampus-immunohistochemical-distribution-of-7-subunits
#18
Harald Stefanits, Ivan Milenkovic, Nina Mahr, Ekaterina Pataraia, Johannes A Hainfellner, Gabor G Kovacs, Werner Sieghart, Deniz Yilmazer-Hanke, Thomas Czech
GABAergic neurotransmission in the amygdala contributes to the regulation of emotional processes in anxiety, stress, reward, mnestic functions, addiction, and epilepsy. Species-specific differences in the distribution and composition of GABAA receptors may account for distinct effects and side-effects of GABAergic agents. However, data on the distribution and composition of GABAA receptors in the human amygdala are lacking. Here, the expression of GABAA receptor subunits α1, α2, α3, α5, β2, β2/3 and γ2 was studied in the human amygdala using immunohistochemistry...
October 12, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28988234/dynamics-of-goldfish-subregional-hippocampal-pallium-activity-throughout-spatial-memory-formation
#19
Francisco M Ocaña, Sara Uceda, Jorge L Arias, Cosme Salas, Fernando Rodríguez
The teleost fish hippocampal pallium, like the hippocampus of tetrapods, is essential for relational map-like spatial memories. In mammals, these relational memories involve the dynamic interactions among different hippocampal subregions and between the hippocampus-neocortex network, which performs specialized operations such as memory encoding and retrieval. However, how the teleost hippocampal homologue operates to achieve comparably sophisticated spatial cognition capabilities is largely unknown. In the present study, the progressive changes in the metabolic activity of the pallial regions that have been proposed as possible homologues of the mammalian hippocampus were monitored in goldfish...
2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28948088/linking-kindling-to-increased-glutamate-release-in-the-dentate-gyrus-of-the-hippocampus-through-the-stxbp5-tomosyn-1-gene
#20
Seth R Batten, Elena A Matveeva, Sidney W Whiteheart, Thomas C Vanaman, Greg A Gerhardt, John T Slevin
INTRODUCTION: In kindling, repeated electrical stimulation of certain brain areas causes progressive and permanent intensification of epileptiform activity resulting in generalized seizures. We focused on the role(s) of glutamate and a negative regulator of glutamate release, STXBP5/tomosyn-1, in kindling. METHODS: Stimulating electrodes were implanted in the amygdala and progression to two successive Racine stage 5 seizures was measured in wild-type and STXBP5/tomosyn-1(-/-) (Tom(-/-)) animals...
September 2017: Brain and Behavior
keyword
keyword
91855
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"