keyword
MENU ▼
Read by QxMD icon Read
search

CA2 hippocampus

keyword
https://www.readbyqxmd.com/read/27909001/synaptic-phospholipid-signaling-modulates-axon-outgrowth-via-glutamate-dependent-ca2-mediated-molecular-pathways
#1
Johannes Vogt, Sergei Kirischuk, Petr Unichenko, Leslie Schlüter, Assunta Pelosi, Heiko Endle, Jenq-Wei Yang, Nikolai Schmarowski, Jin Cheng, Carine Thalman, Ulf Strauss, Alexey Prokudin, B Suman Bharati, Junken Aoki, Jerold Chun, Beat Lutz, Heiko J Luhmann, Robert Nitsch
Altered synaptic bioactive lipid signaling has been recently shown to augment neuronal excitation in the hippocampus of adult animals by activation of presynaptic LPA2-receptors leading to increased presynaptic glutamate release. Here, we show that this results in higher postsynaptic Ca(2+) levels and in premature onset of spontaneous neuronal activity in the developing entorhinal cortex. Interestingly, increased synchronized neuronal activity led to reduced axon growth velocity of entorhinal neurons which project via the perforant path to the hippocampus...
November 30, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27893017/evaluation-of-cognitive-deficits-and-structural-hippocampal-damage-in-encephalitis-with-leucine-rich-glioma-inactivated-1-antibodies
#2
Carsten Finke, Harald Prüss, Josephine Heine, Sigrid Reuter, Ute A Kopp, Florian Wegner, Florian Then Bergh, Sebastian Koch, Olav Jansen, Thomas Münte, Günther Deuschl, Klemens Ruprecht, Winfried Stöcker, Klaus-Peter Wandinger, Friedemann Paul, Thorsten Bartsch
Importance: Limbic encephalitis with leucine-rich, glioma-inactivated 1 (LGI1) antibodies is one of the most frequent variants of autoimmune encephalitis with antibodies targeting neuronal surface antigens. However, the neuroimaging pattern and long-term cognitive outcome are not well understood. Objective: To study cognitive outcome and structural magnetic resonance imaging (MRI) alterations in patients with anti-LGI1 encephalitis. Design, Setting, and Participants: A cross-sectional study was conducted at the Departments of Neurology at Charité-Universitätsmedizin Berlin and University Hospital Schleswig-Holstein, Kiel, Germany...
November 21, 2016: JAMA Neurology
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/27886057/age-related-modulations-of-aqp4-and-caveolin-1-in-the-hippocampus-predispose-the-toxic-effect-of-phoneutria-nigriventer-spider-venom
#4
Edilene S Soares, Leila M Stávale, Monique C P Mendonça, Andressa Coope, Maria Alice da Cruz-Höfling
We have previously demonstrated that Phoneutria nigriventer venom (PNV) causes blood-brain barrier (BBB) breakdown, swelling of astrocytes end-feet and fluid permeation into brain interstitium in rats. Caveolae and water channels respond to BBB alterations by co-participation in shear stress response and edema formation/resolution. Herein, we showed post-natal developmental-related changes of two BBB-associated transporter proteins: the endothelial caveolin-1 (Cav-1), the major scaffolding protein from caveolae frame, and the astroglial aquaporin-4 (AQP4), the main water channel protein expressed in astrocytic peri-vascular end-feet processes, in the hippocampus of rats intraperitoneally-administered PNV...
November 23, 2016: International Journal of Molecular Sciences
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/27843674/granulovacuolar-degeneration-in-hippocampus-of-neurodegenerative-diseases-quantitative-study
#6
Maher Kurdi, Esther Chin, Lee Cyn Ang
Background. Granulovacuolar degeneration (GVD) is one of the pathological features long associated with Alzheimer's disease (AD) and normal aging. Aim. We investigate the frequency of GVDs in AD, other neurodegenerative diseases, and normal aging, with attempt to determine whether the GVD has preponderance in any particular neurodegenerative disease other than AD. Materials and Methods. A retrospective review of 111 autopsied cases with a variety of neurodegenerative diseases and 70 control cases without pathological evidence of neurodegeneration was evaluated quantitatively...
2016: Journal of Neurodegenerative Diseases
https://www.readbyqxmd.com/read/27799552/calcium-sensor-regulation-of-the-cav2-1-ca2-channel-contributes-to-long-term-potentiation-and-spatial-learning
#7
Evanthia Nanou, Todd Scheuer, William A Catterall
Many forms of short-term synaptic plasticity rely on regulation of presynaptic voltage-gated Ca(2+) type 2.1 (CaV2.1) channels. However, the contribution of regulation of CaV2.1 channels to other forms of neuroplasticity and to learning and memory are not known. Here we have studied mice with a mutation (IM-AA) that disrupts regulation of CaV2.1 channels by calmodulin and related calcium sensor proteins. Surprisingly, we find that long-term potentiation (LTP) of synaptic transmission at the Schaffer collateral-CA1 synapse in the hippocampus is substantially weakened, even though this form of synaptic plasticity is thought to be primarily generated postsynaptically...
November 15, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27696657/depressive-symptoms-modify-age-effects-on-hippocampal-subfields-in-older-adults
#8
Sarah M Szymkowicz, Molly E McLaren, Andrew O'Shea, Adam J Woods, Stephen D Anton, Vonetta M Dotson
AIM: Major depression is associated with hippocampal volume changes, especially in late-life depression. These changes usually consist of volume reductions, but depression-related increases in hippocampal volume have also been reported. Subfield analysis has identified structural changes primarily in the cornu ammonis (CA) 1, CA2-3 and subiculum of the hippocampus in individuals with major depression; however, it is unclear whether lower levels of depressive symptoms are also associated volume reduction, or if depressive symptoms interact with age to impact hippocampal subfields...
October 2, 2016: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/27662312/stress-induced-synaptic-dysfunction-and%C3%A2-neurotransmitter-release-in%C3%A2-alzheimer-s-disease-can-neurotransmitters-and-neuromodulators-be%C3%A2-potential-therapeutic-targets
#9
Saurabh Kumar Jha, Niraj Kumar Jha, Dhiraj Kumar, Renu Sharma, Abhishek Shrivastava, Rashmi K Ambasta, Pravir Kumar
The communication between neurons at synaptic junctions is an intriguing process that monitors the transmission of various electro-chemical signals in the central nervous system. Albeit any aberration in the mechanisms associated with transmission of these signals leads to loss of synaptic contacts in both the neocortex and hippocampus thereby causing insidious cognitive decline and memory dysfunction. Compelling evidence suggests that soluble amyloid-β (Aβ) and hyperphosphorylated tau serve as toxins in the dysfunction of synaptic plasticity and aberrant neurotransmitter (NT) release at synapses consequently causing a cognitive decline in Alzheimer's disease (AD)...
September 23, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27650674/3-hz-subthreshold-oscillations-of-ca2-neurons-in-vivo
#10
Nobuyoshi Matsumoto, Kazuki Okamoto, Yuki Takagi, Yuji Ikegaya
The CA2 region is unique in the hippocampus; it receives direct synaptic innervations from several hypothalamic nuclei and expresses various receptors of neuromodulators, including adenosine, vasopressin, and oxytocin. Furthermore, the CA2 region may have distinct brain functions, such as the control of instinctive and social behaviors; however, little is known about the dynamics of the subthreshold membrane potentials of CA2 neurons in vivo. We conducted whole-cell current-clamp recordings from CA2 pyramidal cells in urethane-anesthetized mice and monitored the intrinsic fluctuations in their membrane potentials...
December 2016: Hippocampus
https://www.readbyqxmd.com/read/27618518/abnormalities-in-functional-connectivity-in-collegiate-football-athletes-with-and-without-a-concussion-history-implications-and-role-of-neuroactive-kynurenine-pathway-metabolites
#11
Timothy B Meier, Melissa A Lancaster, Andrew R Mayer, T Kent Teague, Jonathan Savitz
There is a great need to identify potential long-term consequences of contact sport exposure and to identify molecular pathways that may be associated with these changes. We tested the hypothesis that football players with (Ath-mTBI) (n = 25) and without a concussion history (Ath) (n = 24) have altered resting state functional connectivity in regions with previously documented structural changes relative to healthy controls without football or concussion history (HC) (n = 27). As a secondary aim, we tested the hypothesis that group differences in functional connectivity are moderated by the relative ratio of neuroprotective to neurotoxic metabolites of the kynurenine pathway...
October 13, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27593179/role-of-hippocampal-ca2-region-in-triggering-sharp-wave-ripples
#12
Azahara Oliva, Antonio Fernández-Ruiz, György Buzsáki, Antal Berényi
Sharp-wave ripples (SPW-Rs) in the hippocampus are implied in memory consolidation, as shown by observational and interventional experiments. However, the mechanism of their generation remains unclear. Using two-dimensional silicon probe arrays, we investigated the propagation of SPW-Rs across the hippocampal CA1, CA2, and CA3 subregions. Synchronous activation of CA2 ensembles preceded SPW-R-related population activity in CA3 and CA1 regions. Deep CA2 neurons gradually increased their activity prior to ripples and were suppressed during the population bursts of CA3-CA1 neurons (ramping cells)...
September 21, 2016: Neuron
https://www.readbyqxmd.com/read/27581393/neural-cell-proliferation-and-survival-in-the-hippocampus-of-adult-cav-2-1-calcium-ion-channel-mutant-mice
#13
Fikru Nigussie, Pei-San Huang, Kris Lukauskis, Bhupinder Bawa, Eid Moussa, Louise C Abbott
Tottering mutant mice carry a mutation in the pore-forming subunit (α1A) of CaV2.1 (P/Q-type) voltage-gated calcium ion (Ca(2+)) channels resulting in reduced neuronal Ca(2+) current density. We assessed male tottering mice for spatial learning using the Morris water maze. Tottering mice performed worse than wild type mice, suggesting abnormal hippocampal function. Because Ca(2+) influx via voltage-dependent Ca(2+) channels regulates neuronal survival and function, we assessed hippocampus volume and cell density using hematoxylin and eosin stained serial sections...
November 1, 2016: Brain Research
https://www.readbyqxmd.com/read/27579183/anorexia-reduces-gfap-cell-density-in-the-rat-hippocampus
#14
Daniel Reyes-Haro, Francisco Emmanuel Labrada-Moncada, Durairaj Ragu Varman, Janina Krüger, Teresa Morales, Ricardo Miledi, Ataúlfo Martínez-Torres
Anorexia nervosa is an eating disorder observed primarily in young women. The neurobiology of the disorder is unknown but recently magnetic resonance imaging showed a volume reduction of the hippocampus in anorexic patients. Dehydration-induced anorexia (DIA) is a murine model that mimics core features of this disorder, including severe weight loss due to voluntary reduction in food intake. The energy supply to the brain is mediated by astrocytes, but whether their density is compromised by anorexia is unknown...
2016: Neural Plasticity
https://www.readbyqxmd.com/read/27567835/high-sodium-diet-has-opposing-effects-on%C3%A2-mean-arterial-blood-pressure-and%C3%A2-cerebral-perfusion-in-a-transgenic-mouse-model-of-alzheimer-s-disease
#15
Saeid Taheri, Jin Yu, Hong Zhu, Mark S Kindy
BACKGROUND: Cerebral ionic homeostasis impairment, especially Ca2+, has been observed in Alzheimer's disease (AD) and also with hypertension. Hypertension and AD both have been implicated in impaired cerebral autoregulation. However, the relationship between the ionic homeostasis impairment in AD and hypertension and cerebral blood flow (CBF) autoregulation is not clear. OBJECTIVE: To test the hypothesis that a high-salt diet regimen influences the accumulation of amyloid-β (Aβand CBF) and CBF, exacerbates cognitive decline, and increases the propensity to AD...
October 4, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27564217/investigation-of-hippocampal-substructures-in-focal-temporal-lobe-epilepsy-with-and-without-hippocampal-sclerosis-at-7t
#16
Brendan G Santyr, Maged Goubran, Jonathan C Lau, Benjamin Y M Kwan, Fateme Salehi, Donald H Lee, Seyed M Mirsattari, Jorge G Burneo, David A Steven, Andrew G Parrent, Sandrine de Ribaupierre, Robert R Hammond, Terry M Peters, Ali R Khan
PURPOSE: To provide a more detailed investigation of hippocampal subfields using 7T magnetic resonance imaging (MRI) for the identification of hippocampal sclerosis in temporal lobe epilepsy (TLE). MATERIALS AND METHODS: Patients (n = 13) with drug-resistant TLE previously identified by conventional imaging as having hippocampal sclerosis (HS) or not (nine without HS, four HS) and 20 age-matched healthy controls were scanned and compared using a 7T MRI protocol...
August 26, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27543774/effects-of-diclofenac-sodium-on-the-hippocampus-of-rats-with-acute-subdural-hematoma-histological-stereological-and-molecular-approach
#17
A P Türkmen, S Kaplan, A Aksoy, Bz Altunkaynak, Kk Yurt, E Elibol, C Çokluk, Me Onger
This study was aimed at evaluating the potential effects of acute subdural hematoma (ASDH) and diclofenac sodium (DS) therapy following ASDH on the rat hippocampus. Twenty-four male Sprague Dawley rats were used and divided into four groups. 0.1 ml of non-heparinized autologous blood from the tail vein of the animals in the non-treatment group (NTG) and treatment group (TG) was injected into the subdural space. The TG received intramuscular diclofenac sodium at a 15 mg/kg dose daily from the postoperative second hour to the seventh day after the operation...
2016: Folia Neuropathologica
https://www.readbyqxmd.com/read/27455799/-zinc-and-tin-induced-apoptotic-mechanisms-in-immune-system-and-cranial-nerve-system
#18
Kenichi Tomiyama, Yasuaki Arakawa
This review explains the mechanisms of apoptosis related to the impacts of zinc deficiency and organotin exposure on the immune and central nervous systems. In the immune systems, both zinc deficiency and trialkyltin exposure lead to severe thymic atrophy and affect T-lymphocyte development through apoptosis of double positive stage pre-T-cells(CD4+/CD8+) in the cortex region. Their apoptosis are caused mainly through decrease in Bcl-2 expression, activation of ROS production/release, oxidative stress, mitochondrial cytochrome c release and activation of caspase cascade, with increases in glucocorticoids in zinc deficiency, without the involvement of glucocorticoid in organotin exposure In the central nervous system, both zinc deficiency and trialkyltin exposure reduce learning, memory and sensory functions through neuronal apoptosis caused by activation of ROS production/release, release of pro-apoptotic factors such as cytochrome c or apoptosis-inducing factor(AIF), with Fe excessive accumulation leading to ROS production and with depletion of hippocampus Zn (mossy fiber Zn) causing various Ca2+ channel disorder of synapse in the hippocampus, and with excessive accumulation of Ca through cAMP-dependent Ca(2+)-channel disorder by excessive PTH and cAMP excessive production in the olfactory systems such as olfactory epithelium and olfactory bulb...
July 2016: Nihon Rinsho. Japanese Journal of Clinical Medicine
https://www.readbyqxmd.com/read/27421897/voluntary-running-depreciates-the-requirement-of-ca2-stimulated-camp-signaling-in-synaptic-potentiation-and-memory-formation
#19
Fei Zheng, Ming Zhang, Qi Ding, Ferzin Sethna, Lily Yan, Changjong Moon, Miyoung Yang, Hongbing Wang
Mental health and cognitive functions are influenced by both genetic and environmental factors. Although having active lifestyle with physical exercise improves learning and memory, how it interacts with the specific key molecular regulators of synaptic plasticity is largely unknown. Here, we examined the effects of voluntary running on long-term potentiation (LTP) and memory formation in mice lacking type 1 adenylyl cyclase (AC1), a neurospecific synaptic enzyme that contributes to Ca(2+)-stimulated cAMP production...
August 2016: Learning & Memory
https://www.readbyqxmd.com/read/27413157/time-cells-in-hippocampal-area-ca3
#20
Daniel M Salz, Zoran Tiganj, Srijesa Khasnabish, Annalyse Kohley, Daniel Sheehan, Marc W Howard, Howard Eichenbaum
UNLABELLED: Studies on time cells in the hippocampus have so far focused on area CA1 in animals performing memory tasks. Some studies have suggested that temporal processing within the hippocampus may be exclusive to CA1 and CA2, but not CA3, and may occur only under strong demands for memory. Here we examined the temporal and spatial coding properties of CA3 and CA1 neurons in rats performing a maze task that demanded working memory and a control task with no explicit working memory demand...
July 13, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
keyword
keyword
83519
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"