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excitation/inhibition hippocampus

Zheng-Luan Liao, Yun-Fei Tan, Ya-Ju Qiu, Jun-Peng Zhu, Yan Chen, Si-Si Lin, Ming-Hao Wu, Yan-Ping Mao, Jiao-Jiao Hu, Zhong-Xiang Ding, En-Yan Yu
The purpose of this study was to explore the differences in interhemispheric functional connectivity in patients with Alzheimer's disease (AD) and amnestic mild cognitive impairment (aMCI) based on a triple network model consisting of the default mode network (DMN), salience network (SN), and executive control network (ECN). The technique of voxel-mirrored homotopic connectivity (VMHC) analysis was applied to explore the aberrant connectivity of all patients. The results showed that: (1) the statistically significant connections of interhemispheric brain regions included DMN-related brain regions (i...
2018: Journal of Zhejiang University. Science. B
Tara G Chowdhury, Gauri S Wable, Yi-Wen Chen, Kei Tateyama, Irene Yu, Jia-Yi Wang, Alex D Reyes, Chiye Aoki
Adolescence is marked by increased vulnerability to mental disorders and maladaptive behaviors, including anorexia nervosa. Food-restriction (FR) stress evokes foraging, which translates to increased wheel running exercise (EX) for caged rodents, a maladaptive behavior, since it does not improve food access and exacerbates weight loss. While almost all adolescent rodents increase EX following FR, some then become resilient by suppressing EX by the second-fourth FR day, which minimizes weight loss. We asked whether GABAergic plasticity in the hippocampus may underlie this gain in resilience...
November 14, 2018: Cerebral Cortex
Laura G Kammel, Weizheng Wei, Shekib A Jami, Rhonda R Voskuhl, Thomas J O'Dell
Cognitive impairment (CI), a debilitating and pervasive feature of multiple sclerosis (MS), is correlated with hippocampal atrophy. Findings from postmortem MS hippocampi indicate that expression of genes involved in both excitatory and inhibitory neurotransmission are altered in MS, and although deficits in excitatory neurotransmission have been reported in the MS model experimental autoimmune encephalomyelitis (EAE), the functional consequence of altered inhibitory neurotransmission remains poorly understood...
November 14, 2018: Neuroscience
Adam R Mergenthal, Jean-Marie C Bouteiller, Theodore W Berger
The hippocampus receives extensive cholinergic modulation from the basal forebrain, which has been shown to have a prominent role in attention, learning, and synaptic plasticity. Disruptions of this modulation have been linked to a variety of neural disorders including Alzheimer's Disease. Pyramidal cells of the CA1 region of the hippocampus express several cholinergic receptor types in different locations throughout the cells' morphology. Developing a computational model of these cells and their modulation provides a unique opportunity to explore how each receptor type alters the overall computational role of the cell...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Eric D Melonakos, John A White, Fernando R Fernandez
Sharp wave-ripples (140-220 Hz) are patterns of brain activity observed in the local field potential of the hippocampus which are present during memory consolidation. As rodents switch from memory consolidation to memory encoding behaviors, cholinergic inputs to the hippocampus from neurons in the medial septum-diagonal band of Broca cause a marked reduction in ripple incidence. The mechanism for this disruption in ripple power is not fully understood. In isolated neurons, the major effect of cholinergic input on hippocampal neurons is depolarization of the membrane potential, which affects both hippocampal pyramidal neurons and inhibitory interneurons...
November 12, 2018: Hippocampus
Jae Hyouk Choi, Oleg Yarishkin, Eunju Kim, Yeonju Bae, Ajung Kim, Seung-Chan Kim, Kanghyun Ryoo, Chang-Hoon Cho, Eun Mi Hwang, Jae-Yong Park
Two-pore domain K+ (K2P) channels have been shown to modulate neuronal excitability. The physiological role of TWIK-1, the first identified K2P channel, in neuronal cells is largely unknown, and we reported previously that TWIK-1 contributes to the intrinsic excitability of dentate gyrus granule cells (DGGCs) in mice. In the present study, we investigated the coexpression of TWIK-1 and TASK-3, another K2P member, in DGGCs. Immunohistochemical staining data showed that TASK-3 proteins were highly localized in the proximal dendrites and soma of DGGCs, and this localization is similar to the expression pattern of TWIK-1...
November 12, 2018: Experimental & Molecular Medicine
Xuehua Li, Jianmeng Zhang, Ruiyan Niu, Ram Kumar Manthari, Kaidong Yang, Jundong Wang
We established the mouse model of fluoride (68 mg F ion/L deionized water) exposure for 90 days, 120 days and 150 days, and applied diverse methods as behavioral models of anxiety and depression, and analyzed the levels of the anxiety- and depression-like related genes like BDNF1, BDNF4, 5-HT1A, VGLUT, GAD67, and VGAT in the mouse hippocampus. In the mice exposed to NaF for 120 days, compared to the control group, chalky opacity was observed on the enamel of teeth; the results of anxiety-like behavior, like elevated zero maze, light/dark exploration test, novel object recognition test and emergence test were significantly altered, however in the mice exposed for 150 days, only the elevated zero maze and emergence test were significantly altered...
January 2019: Chemosphere
Elisabetta Coppi, Daniele Lana, Federica Cherchi, Irene Fusco, Daniela Buonvicino, Matteo Urru, Giuseppe Ranieri, Mirko Muzzi, Ludovica Iovino, Maria Grazia Giovannini, Anna Maria Pugliese, Alberto Chiarugi
Even though pharmacological approaches able to counteract age-dependent cognitive impairment have been highly investigated, drugs improving cognition and memory are still an unmet need. It has been hypothesized that sustaining energy dynamics within the aged hippocampus can boost memory storage by sustaining synaptic functioning and long term potentiation (LTP). Dexpramipexole (DEX) is the first-in-class compound able to sustain neuronal bioenergetics by interacting with mitochondrial F1Fo-ATP synthase. In the present study, for the first time we evaluated the effects of DEX on synaptic fatigue, LTP induction, learning and memory retention...
December 2018: Neuropharmacology
Sophie Lepannetier, Roberta Gualdani, Sabrina Tempesta, Olivier Schakman, François Seghers, Anna Kreis, Xavier Yerna, Amina Slimi, Marie de Clippele, Nicolas Tajeddine, Thomas Voets, Robin S Bon, David J Beech, Fadel Tissir, Philippe Gailly
Group I metabotropic glutamate receptors, in particular mGluR5, have been implicated in various forms of synaptic plasticity that are believed to underlie declarative memory. We observed that mGluR5 specifically activated a channel containing TRPC1, an isoform of the canonical family of transient receptor potential (TRPC) channels highly expressed in CA1-3 regions of the hippocampus. TRPC1 is able to form tetrameric complexes with TRPC4 and/or TRPC5 isoforms. TRPC1/4/5 complexes have recently been involved in the efficiency of synaptic transmission in the hippocampus...
2018: Frontiers in Cellular Neuroscience
Zhiling Guo, Yiu Chung Tse, Ying Zhang, Qiang Sun, Haley A Vecchiarelli, Robert Aukema, Matthew N Hill, Tak Pan Wong, Patricia Boksa
There is strong evidence that immune activation from prenatal infection increases the risk for offspring to develop schizophrenia. The endocannabinoid (eCB) system has been implicated in the pathophysiology of schizophrenia while models of cortical dysfunction postulate an imbalance between neuronal excitation and inhibition in the disorder. The current study examined the impact of prenatal immune activation on eCB-mediated inhibitory mechanisms. We compared two forms of eCB-related plasticity of evoked inhibitory postsynaptic currents, namely depolarization-induced suppression of inhibition (DSI) and metabotropic glutamate receptor-induced long term depression (mGluR-iLTD), in both the dorsal and ventral hippocampus between adolescent offspring from rat dams that received either saline or bacterial lipopolysaccharide (LPS) during pregnancy...
September 23, 2018: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
Xiangchang Zeng, Kai Hu, Lulu Chen, Luping Zhou, Wei Luo, Chaopeng Li, Wenjing Zong, Siyu Chen, Qing Gao, Guirong Zeng, Dejian Jiang, Xiaohui Li, Honghao Zhou, Dong-Sheng Ouyang
The imbalance between the GABA-mediated inhibition and the glutamate-mediated excitation is the primary pathological mechanism of epilepsy. GABAergic and glutamatergic neurotransmission have become the most important targets for controlling epilepsy. Ginsenoside compound K (GCK) is a main metabolic production of the ginsenoside Rb1, Rb2, and Rc in the intestinal microbiota. Previous studies show that GCK promoted the release of GABA from the hippocampal neurons and enhanced the activity of GABAA receptors. GCK is shown to reduce the expression of NMDAR and to attenuate the function of the NMDA receptors in the brain...
2018: Frontiers in Pharmacology
Meral E Kızıltan, Bengi Gül Alpaslan, Çiğdem Özkara, Mustafa Uzan, Ayşegül Gündüz
Prepulse modulation (PPM) is an electrophysiological method which enables to assess sensory processing in vivo. Reflex responses may be facilitated or inhibited (prepulse inhibition, PPI) after a weak stimulus. Theoretically, in animal studies, the generator of PPI involves pedunculopontine nucleus which is modulated by various structures, including amygdala. We aimed to investigate whether or not there was a role of limbic structures in the generation of PPM in humans. For this purpose, we studied PPM of the blink reflex (BR) in 10 patients with mesial temporal lobe epilepsy (MTLE group) and in nine patients who had previously undergone amygdala resection for medically resistant MTLE (surgery group)...
December 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Da Song, Qinghu Yang, Yiran Lang, Zhaosen Wen, Zhen Xie, Da Zheng, Tianyi Yan, Yujun Deng, Hiroshi Nakanishi, Zhenzhen Quan, Hong Qing
The CA3 subregion of the hippocampus is important for rapid encoding, storage and retrieval of associative memories. Lesions and pharmacological inhibitions of hippocampal CA3 suggest that it is essential for different memories. However, how CA3 functions in spatial and episodic memory in different time scales (i.e. short-term versus long term) without permanent lesions has not been systematically investigated yet. Taking advantage of the chemogenetic access to opsins, this study used luminopsins, fusion proteins of luciferase and optogenetic elements, to manipulate neuronal activity in CA3 during memory tasks over a range of spatial and temporal scales...
September 19, 2018: Neurobiology of Learning and Memory
Birgit A Hörmer, Dilip Verma, Elisabeth Gasser, Anna Wieselthaler-Hölzl, Herbert Herzog, Ramon O Tasan
Posttraumatic stress disorder is characterized by contextually inappropriate, dys-regulated and generalized fear expression and often resistant to therapy. The hippocampus integrates contextual information into spatial and emotional memories, but how diverse modulatory neurotransmitters are shaping this process is not known. Neuropeptide Y is a peptide-neurotransmitter, which modulates hippocampal excitability by activating several G-protein-coupled receptors. Postsynaptic Y1 receptors create strong anxiolytic and fear-suppressing behavior, while pre-synaptic Y2 receptors (Y2R) are mainly anxiogenic...
December 2018: Neuropharmacology
Mehdi Sadegh, Mohammad Hassan Sakhaie
Systemic injection of LPS changes neuronal excitability and increase susceptibility for convulsions. Carvacrol exerts neuroprotective and antiepileptic effects in animal models. Herein, we investigated the anticonvulsive effect of carvacrol on LPS induced seizure severity and possible involvement of the hippocampal COX-1 and -2 activities in this effect. Adult male wistar rats were used. LPS was injected (400 μg/kg; i.p.) four hours before the PTZ (80 mg/kg; i.p.) injection. Carvacrol was injected (100 mg/kg; i...
December 2018: Metabolic Brain Disease
Alexandra P Chatzikalymniou, Frances K Skinner
Oscillations in local field potentials (LFPs) are prevalent and contribute to brain function. An understanding of the cellular correlates and pathways affecting LFPs is needed, but many overlapping pathways in vivo make this difficult to achieve. A prevalent LFP rhythm in the hippocampus associated with memory processing and spatial navigation is the θ (3-12 Hz) oscillation. θ rhythms emerge intrinsically in an in vitro whole hippocampus preparation and this reduced preparation makes it possible to assess the contribution of different cell types to LFP generation...
July 2018: ENeuro
Tanvi Paretkar, Eugene Dimitrov
The encoding, consolidation and retrieval of memories is a multifaceted process that depends strongly on the optimal level of arousal but high levels of arousal may trigger anxiety, which negatively impacts the memory processing by the brain. We investigated the role of CRH neurons in the central amygdala (CeA) for their capacity to modulate both, the anxiety-like behavior and hippocampus-dependent memory. First, we activated the CRH neurons in CeA using cre-dependent AAV-DREADD in CRH-cre mice. The activation of CeA CRH neurons increased the anxiety-like behavior in Elevated-O maze (O-maze) and Light-Dark box (LDB)...
October 15, 2018: Neuroscience
Camille Dumon, Diabe Diabira, Ilona Chudotvorova, Francesca Bader, Semra Sahin, Jinwei Zhang, Christophe Porcher, Gary Wayman, Igor Medina, Jean-Luc Gaiarsa
Brain computations rely on a proper balance between excitation and inhibition which progressively emerges during postnatal development in rodent. γ-Aminobutyric acid (GABA) neurotransmission supports inhibition in the adult brain but excites immature rodent neurons. Alterations in the timing of the GABA switch contribute to neurological disorders, so unveiling the involved regulators may be a promising strategy for treatment. Here we show that the adipocyte hormone leptin sets the tempo for the emergence of GABAergic inhibition in the newborn rodent hippocampus...
August 14, 2018: ELife
Yu-Jing Ding, Yu Song, Jun-Xiu Liu, Ya-Li Du, Li Zhu, Fu-Rong Ma
Background: Tinnitus is a common disorder that causes significant morbidity; however, the neurophysiological mechanism is not yet fully understood. A relationship between tinnitus and limbic system has been reported. As a significant component of the limbic system, the hippocampus plays an important role in various pathological processes, such as emotional disturbance, decreased learning ability, and deterioration of memory. This study was aimed to explore the role of the hippocampus in the generation of tinnitus by electrophysiological technology...
August 20, 2018: Chinese Medical Journal
Andrew L Eagle, Elizabeth S Williams, Joseph A Beatty, Charles L Cox, Alfred J Robison
Both the function of hippocampal neurons and hippocampus-dependent behaviors are dependent on changes in gene expression, but the specific mechanisms that regulate gene expression in hippocampus are not yet fully understood. The stable, activity-dependent transcription factor ΔFosB plays a role in various forms of hippocampal-dependent learning and in the structural plasticity of synapses onto CA1 neurons. The authors examined the consequences of viral-mediated overexpression or inhibition of ΔFosB on the function of adult mouse hippocampal CA1 neurons using ex vivo slice whole-cell physiology...
July 2018: ENeuro
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