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https://www.readbyqxmd.com/read/28729940/propofol-induced-downregulation-of-nr2b-membrane-translocation-in-hippocampus-and-spatial-memory-deficits-of-neonatal-mice
#1
Yuzhu Wang, Song Han, Ruquan Han, Yue Su, Junfa Li
BACKGROUND: Thousands of infants and children are undergoing anesthesia around the world every day. But impacts of anesthetics on the developing neural system remain unclear yet. Previous evidence showed that anesthesia might affect the developing neural system. Thus, early-life anesthesia becomes a critical issue in clinical pediatric practice. Hence, propofol, a short-acting and widely applied intravenous anesthetic, has been gaining focus upon neonatal anesthesia. METHODS: Fifty-four male C57BL/6J mice were randomly divided into following three groups: group D6 intraperitoneally (i...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729191/hypothermia-pretreatment-improves-cognitive-impairment-via-enhancing-synaptic-plasticity-in-a-traumatic-brain-injury-model
#2
Bingjin Liu, Lin Wang, Yun Cao, Weiqi Xu, Fangxiao Shi, Qing Tian, Xinwen Zhou
PosttraumatichypothermiaattenuatescognitivedeficitscausedbyTBIwhen it is administered at an early stage. However, little is known regarding the effect of hypothermia pretreatment on cognitive deficits one month after TBI. In the current study, the behavior test revealed that hypothermia pretreatment mitigates the learning and memory impairment induced by TBI in mice. Hypothermia treatment significantly increased the expression of PSD93, PSD95 and NR2B one month after TBI in the cortex and hippocampus compared with the normothermia group...
July 17, 2017: Brain Research
https://www.readbyqxmd.com/read/28723598/effects-of-tumor-necrosis-factor-blocker-on-salicylate-induced-tinnitus-in-mice
#3
Juen-Haur Hwang, David Chang-Wei Huang, Yin-Chang Lu, Wei-Shiung Yang, Tien-Chen Liu
OBJECTIVE: Neuroinflammation is considered a novel mechanism for acute tinnitus. Here, we investigated the effects of a tumor necrosis factor (TNF) blocker on the gene expression of inflammatory-cytokine in the cochlea in a tinnitus animal model. METHODS: Enbrel® (30 mg/kg, intraperitoneally (i.p.)) were administrated to the mice with the salicylate induced tinnitus for 3 days. Tinnitus score and mRNA expression levels of TNFR1, TNFR2, and N-methyl-d-aspartate receptor subunit 2B (NR2B) and its downstream regulatory element antagonist modulator (DREAM) in the cochlea of mice were measured and compared to the control...
June 1, 2017: International Tinnitus Journal
https://www.readbyqxmd.com/read/28711909/h2o2-attenuates-igf-1r-tyrosine-phosphorylation-and-its-survival-signaling-properties-in-neuronal-cells-via-nr2b-containing-nmda-receptor
#4
Zhiwen Zeng, Dejun Wang, Uma Gaur, Liao Rifang, Haitao Wang, Wenhua Zheng
Impairment of insulin-like growth factor I (IGF-I) signaling plays an important role in the development of neurodegeneration. In the present study, we investigated the effect of H2O2 on the survival signaling of IGF-1 and its underlying mechanisms in human neuronal cells SH-SY5Y. Our results showed that IGF-1 promoted cell survival and stimulated phosphorylation of IGF-1R as well as its downstream targets like AKT and ERK1/2 in these cells. Meanwhile, these effects of IGF-1 were abolished by H2O2 at 200μM concentration which did not cause any significant toxicity to cells itself in our experiments...
June 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28681915/17%C3%AE-estradiol-rescues-damages-following-traumatic-brain-injury-from-molecule-to-behavior-in-mice
#5
Huaihai Lu, Kun Ma, Liwei Jin, He Zhu, Ruiqi Cao
Traumatic brain injury (TBI) is a public health concern, and causes cognitive dysfunction, emotional disorders, and neurodegeration, as well. The currently available treatments are all symptom-oriented with unsatifying efficacy. It is highly demanded to understand its underlying mechanisms. Controlled cortical impact (CCI) was used to induce TBI in aged female mice subjected to ovariectomy. Brain damages were assessed with neurological severity score, brain infarction and edema. Morris water maze and elevated plus maze were applied to evaluate the levels of anxiety...
July 6, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28676746/regulation-of-fear-extinction-in-the-basolateral-amygdala-by-dopamine-d2-receptors-accompanied-by-altered-glur1-glur1-ser845-and-nr2b-levels
#6
Yan-Wei Shi, Bu-Fang Fan, Li Xue, Jia-Ling Wen, Hu Zhao
The amygdala, a critical structure for both Pavlovian fear conditioning and fear extinction, receives sparse but comprehensive dopamine innervation and contains dopamine D1 and D2 receptors. Fear extinction, which involves learning to suppress the expression of a previously learned fear, appears to require the dopaminergic system. The specific roles of D2 receptors in mediating associative learning underlying fear extinction require further study. Intra-basolateral amygdala (BLA) infusions of a D2 receptor agonist, quinpirole, and a D2 receptor antagonist, sulpiride, prior to fear extinction and extinction retention were tested 24 h after fear extinction training for long-term memory (LTM)...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28663035/inhibition-of-interleukin-6-function-attenuates-the-central-sensitization-and-pain-behavior-induced-by-osteoarthritis
#7
Yuangui Lin, Lian Liu, Haixia Jiang, Jieshu Zhou, Yuying Tang
Chronic pain is the most prominent and disabling symptom in the patients with osteoarthritis (OA), and the underlying mechanism largely remains unclear. Interleukin-6 (IL-6), a proinflammatory cytokine, is critically involved in the development and maintenance of central sensitization in several rodent models of chronic pain. The present study aims to elucidate the IL-6 mediated neurological adaptation in dorsal horn in the rat with monosodium iodoacetate (MIA) -induced OA. Significant upregulation of IL-6 expression was detected in the dorsal horn in the modeled rats...
June 26, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28659754/nadph-oxidase-isoform-2-nox2-is-involved-in-drug-addiction-vulnerability-in-progeny-developmentally-exposed-to-ethanol
#8
Marcela L Contreras, Erwin de la Fuente-Ortega, Sofía Vargas-Roberts, Daniela C Muñoz, Carolina A Goic, Paola A Haeger
Ethanol exposure increases oxidative stress in developing organs, including the brain. Antioxidant treatment during maternal ethanol ingestion improves behavioral deficits in rodent models of fetal alcohol spectrum disorder (FASD). However, the impact of general antioxidant treatment in their adult offspring and the Specific Reactive Species (ROS)-dependent mechanism, are not fully understood. We hypothesized that pre and early postnatal ethanol exposure (PEE) modifies redox homeostasis, in particular NOX2 function during reward signaling in the mesocorticolimbic pathway, which reinforces the effects of alcohol...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28649199/glyx-13-a-nmda-receptor-glycine-site-functional-partial-agonist-attenuates-cerebral-ischemia-injury-in-vivo-and-vitro-by-differential-modulations-of-nmda-receptors-subunit-components-at-different-post-ischemia-stage-in-mice
#9
Chen Zheng, Zhi H Qiao, Meng Z Hou, Nan N Liu, Bin Fu, Ran Ding, Yuan Y Li, Liang P Wei, Ai L Liu, Hui Shen
Excessive activation of NMDA receptors (NMDARs) is implicated in pathological synaptic plasticity also known as post-ischemic long-term potentiation (i-LTP) which was produced by glutamate mediated excitotoxicity after stroke. In the past decades, many NMDARs inhibitors failed in clinical investigations due to severe psychotomimetic side effects. GLYX-13 is a NMDAR modulator with glycine site partial agonist properties and has potential protective effects on ischemic neuronal death. However, the underlying molecular mechanism of GLYX-13 attenuating the ischemic neuronal damage remains elusive...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28636948/pten%C3%AE-modulates-camkii-signaling-and-controls-contextual-fear-memory-and-spatial-learning
#10
Pan Wang, Fan Mei, Jiapan Hu, Minglu Zhu, Hailong Qi, Xi Chen, Ruiqi Li, Michael A McNutt, Yuxin Yin
PTEN (phosphatase and tensin homology deleted on chromosome 10) has multiple functions, and recent studies have shown that the PTEN family has isoforms. The roles of these PTEN family members in biologic activities warrant specific evaluation. Here, we show that PTENα maintains CaMKII in a state that is competent to induce long-term potentiation (LTP) with resultant regulation of contextual fear memory and spatial learning. PTENα binds to CaMKII with its distinctive N terminus and resets CaMKII to an activatable state by dephosphorylating it at sites T305/306...
June 20, 2017: Cell Reports
https://www.readbyqxmd.com/read/28634070/high-and-low-concentration-of-17%C3%AE-estradiol-protect-cerebellar-granule-neurons-in-different-time-windows
#11
Irene B Sørvik, Ragnhild E Paulsen
17α-estradiol is a hormonally inactive isomer of 17β-estradiol, but with similar potency as neuroprotector. However, we have previously reported that pretreatment with high concentration (10 μM) of both estrogens abolishes their neuroprotection in rat cerebellar granule neurons. Here, we have examined neuroprotective properties of 17α-estradiol against glutamate-induced excitotoxicity in chicken cerebellar granule neurons using low (1 nM) and high concentration.17α-Estradiol, 1 nM, was neuroprotective when glutamate was administered after a pretreatment period of 24 h, but not when coadministered with glutamate...
June 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28633291/p2x7-receptors-drive-spine-synapse-plasticity-in-the-learned-helplessness-model-of-depression
#12
L Otrokocsi, Á Kittel, B Sperlágh
Background: Major depressive disorder is characterized by structural and functional abnormalities of cortical and limbic brain areas, including a decrease in spine synapse number in the dentate gyrus (DG) of the hippocampus. Recent studies highlighted that both genetic and pharmacological invalidation of the purinergic P2X7 receptor (P2rx7) leads to antidepressant-like phenotype in animal experiments, however, the impact of P2rx7 on depression-related structural changes in the hippocampus is not clarified yet...
June 13, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28628228/epigenetic-mechanisms-underlying-nmda-receptor-hypofunction-in-the-prefrontal-cortex-of-juvenile-animals-in-the-mam-model-for-schizophrenia
#13
Yelena Gulchina, Song-Jun Xu, Melissa A Snyder, Felice Elefant, Wen-Jun Gao
Schizophrenia (SCZ) is characterized not only by psychosis, but also by working memory and executive functioning deficiencies, processes that rely on the prefrontal cortex (PFC). Because these cognitive impairments emerge prior to psychosis onset, we investigated synaptic function during development in the neurodevelopmental methylazoxymethanol acetate (MAM) model for SCZ. Specifically, we hypothesize that NMDAR hypofunction is attributable to reductions in the NR2B subunit through aberrant epigenetic regulation of gene expression, resulting in deficient synaptic physiology and PFC-dependent cognitive dysfunction, a hallmark of SCZ...
June 19, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28614182/ethanol-alters-n-methyl-d-aspartate-receptor-regulation-in-the-hippocampus-of-adolescent-rats
#14
Ratna Sircar
Our laboratory and others have shown that ethanol disrupts hippocampus-associated memory formation in adolescent rats, but the signaling pathway involved remains largely unknown. Phosphorylation of the N-methyl-D-aspartate receptor, particularly the N-methyl-D-aspartate receptor subunit 2B (NR2B), has been implicated in several ethanol effects and in memory formation. The present study investigated the effects of repeated ethanol exposure on the phosphorylation of the NR2B subunit and src protein in the hippocampus of adolescent rats...
August 2, 2017: Neuroreport
https://www.readbyqxmd.com/read/28596523/extrasynaptic-nmda-receptor-dependent-long-term-potentiation-of-hippocampal-ca1-pyramidal-neurons
#15
Qian Yang, Geng Zhu, Dandan Liu, Jue-Gang Ju, Zhen-Hua Liao, Yi-Xin Xiao, Yue Zhang, Naijian Chao, JieJie Wang, Weidong Li, Jian-Hong Luo, Sheng-Tian Li
In the adult mouse hippocampus, NMDA receptors (NMDARs) of CA1 neurons play an important role in the synaptic plasticity. The location of NMDARs can determine their roles in the induction of long-term potentiation (LTP). However, the extrasynaptic NMDARs (ES-NMDARs) dependent LTP haven't been reported. Here, through the use of a 5-Hz stimulation and MK-801 (an irreversible antagonist of NMDARs) in the CA1 neurons of adult mice hippocampal slices, synaptic NMDARs were selectively inhibited and NMDAR-mediated excitatory postsynaptic currents were not recovered...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28594961/pirb-regulates-asymmetries-in-hippocampal-circuitry
#16
Hikari Ukai, Aiko Kawahara, Keiko Hirayama, Matthew Julian Case, Shotaro Aino, Masahiro Miyabe, Ken Wakita, Ryohei Oogi, Michiyo Kasayuki, Shihomi Kawashima, Shunichi Sugimoto, Kanako Chikamatsu, Noritaka Nitta, Tsuneyuki Koga, Ryuichi Shigemoto, Toshiyuki Takai, Isao Ito
Left-right asymmetry is a fundamental feature of higher-order brain structure; however, the molecular basis of brain asymmetry remains unclear. We recently identified structural and functional asymmetries in mouse hippocampal circuitry that result from the asymmetrical distribution of two distinct populations of pyramidal cell synapses that differ in the density of the NMDA receptor subunit GluRε2 (also known as NR2B, GRIN2B or GluN2B). By examining the synaptic distribution of ε2 subunits, we previously found that β2-microglobulin-deficient mice, which lack cell surface expression of the vast majority of major histocompatibility complex class I (MHCI) proteins, do not exhibit circuit asymmetry...
2017: PloS One
https://www.readbyqxmd.com/read/28588664/impact-of-botox-a-snap-25-protein-expression-and-the-mechanism-of-inhibitory-neurotransmitter-imbalance-in-chronic-sciatic-nerve-pain-rat-model
#17
Xu-Dong Ding, Wei Wang, Zhi-Gang Ding, Yan-Ping Liu, Jing Zhong, Hua-Xian Chen
The Botox-A impact on the expression of SNAP-25 protein in rat chronic sciatic nerve pain model was assessed and the mechanism of inhibitory neurotransmitter imbalance was studied. A chronic constriction injury (CCI) model consisted of 30 healthy male rats. The rats were randomly divided into the sham-operated group, CCI group and BoNT/A intervention group, and during 1, 7 and 14 days we conducted mechanical withdrawal threshold (MWT) test and thermal withdrawal latency (TWL) test before and after operation...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28579944/impaired-spinal-glucocorticoid-receptor-signaling-contributes-to-the-attenuating-effect-of-depression-on-mechanical-allodynia-and-thermal-hyperalgesia-in-rats-with-neuropathic-pain
#18
Xiao Wei, Yuqi Sun, Fei Luo
Although depression-induced altered pain perception has been described in several laboratory and clinical studies, its neurobiological mechanism in the central nervous system (CNS), particularly in the spinal dorsal horn, remains unclear. Therefore, in this study, we aimed to clarify whether nociceptive sensitivity of neuropathic pain is altered in the olfactory bulbectomy (OB) model of depression and whether glucocorticoid receptor (GR), which is involved in the etio-pathologic mechanisms of both major depression and neuropathic pain, contributes to these processes in the spinal dorsal horn of male Sprague-Dawley rats...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28579906/dexmedetomidine-attenuates-neuropathic-pain-in-chronic-constriction-injury-by-suppressing-nr2b-nf-%C3%AE%C2%BAb-and-inos-activation
#19
Feng Liang, Miao Liu, Xin Fu, Xueying Zhou, Peng Chen, Fanglei Han
The effective treatment of patients suffering from neuropathic pain remains challenging. Dexmedetomidine (DEX) possesses anti-inflammatory activity. However, the role of DEX in neuropathic pain is still unclear. The aim of the present study was to examine DEX an α2-adrenoceptor agonist could improve pain hypersensitivity and reduce inflammatory in a chronic constriction injury (CCI) model of the sciatic nerve in Sprague-Dawley rats. Dex was intrathecally administrated 1-h after operation. The paw mechanical withdrawal threshold (MWT) and paw withdrawal thermal latency (PWTL) were measured on day 1 before operation and on days 1, 7, 14 and 21 after operation, respectively...
May 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28576649/anti-androgenic-effects-of-bisphenol-a-on-spatial-memory-and-synaptic-plasticity-of-the-hippocampus-in-mice
#20
Zhaoqing Fang, Qingjie Zhu, Ting Gu, Xiuying Shen, Yang Yang, Yufeng Liang, Zigui Zhang, Xiaohong Xu
Bisphenol-A (BPA) is a common environmental endocrine disruptor. Our recent studies found that exposure to BPA in both adolescent and adulthood sex-specifically impaired spatial memory in male mice. In this study, 11-week-old gonadectomied (GDX) male mice daily received subcutaneous injections of testosterone propionate (TP, 0.5mg/kg), TP and BPA (0.4 and 4mg/kg), or vehicle for 45days. The results of Morris water maze task showed that exposure to BPA did not affect the spatial memory of GDX mice but impaired that of sham (4mg/kg/day) and TP-treated GDX mice (0...
June 8, 2017: Hormones and Behavior
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