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https://www.readbyqxmd.com/read/29050205/catalpol-protects-synaptic-proteins-from-beta-amyloid-induced-neuron-injury-and-improves-cognitive-functions-in-aged-rats
#1
Zhiming Xia, Fengfei Wang, Shuang Zhou, Rui Zhang, Fushun Wang, Jason H Huang, Erxi Wu, Yongfang Zhang, Yaer Hu
Synapse loss is one of the common factors contributing to cognitive disorders, such as Alzheimer's disease (AD), which is manifested by the impairment of basic cognitive functions including memory processing, perception, problem solving, and language. The current therapies for patients with cognitive disorders are mainly palliative; thus, regimens preventing and/or delaying dementia progression are urgently needed. In this study, we evaluated the effects of catalpol, isolated from traditional Chinese medicine Rehmannia glutinosa, on synaptic plasticity in aged rat models...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29038420/effects-of-different-training-loads-on-emotional-state-and-mrna-and-protein-expressions-of-n-methyl-d-aspartate-receptor-subunits-postsynaptic-density-95-and-kinesin-family-member-17-in-hippocampus-of-rats
#2
Hefei Ren, Xinyi Yu, Liren Yu, Yinguo Zhang, Hong Xie, Na Shi, Lijun Chen
BACKGROUND Emotional state can be affected by different training loads. The aim of this study was to explore the changes of rat emotional state, as well as the mRNA and protein expressions of N-methyl-D-aspartate receptors (NMDARs), postsynaptic density 95 (PSD-95), and kinesin family member 17 (KIF-17) in the hippocampus, by long-term moderate-intensity and high-intensity training models in rats. MATERIAL AND METHODS The exercise model of SD rats was set up by treadmill running of moderate and high intensities for 4 weeks...
October 17, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29034441/the-oral-pretreatment-of-glycyrrhizin-prevents-surgery-induced-cognitive-impairment-in-aged-mice-by-reducing-neuroinflammation-and-alzheimer-s-related-pathology-via-hmgb1-inhibition
#3
Zhong-Hong Kong, Xin Chen, Hui-Po Hua, Liang Liang, Long-Juan Liu
Neuroinflammation and Alzheimer's-related pathology play essential roles in postoperative cognitive dysfunction (POCD). High-mobility group box 1 (HMGB1) is well known as a pivotal mediator in neuroinflammation, and its associations with Alzheimer's-related pathology and POCD have been also revealed. Glycyrrhizin is a nature inhibitor of HMGB1 and is reported with neuroprotective effects through oral administration. Therefore, the present study aims to test the hypothesis that the oral pretreatment of glycyrrhizin prevents POCD by inhibiting HMGB1-induced neuroinflammation and Alzheimer's-related pathology in aged mice...
October 16, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29030434/cadherin-10-maintains-excitatory-inhibitory-ratio-through-interactions-with-synaptic-proteins
#4
Katharine R Smith, Kelly A Jones, Katherine J Kopeikina, Alain C Burette, Bryan A Copits, Sehyoun Yoon, Marc Forrest, Jessica M Fawcett-Patel, Jonathan G Hanley, Richard J Weinberg, Geoffrey T Swanson, Peter Penzes
Appropriate excitatory-inhibitory (E/I) balance is essential for normal cortical function and is altered in some psychiatric disorders, including autism spectrum disorders (ASDs). Cell-autonomous molecular mechanisms that control the balance of excitatory and inhibitory synapse function remain poorly understood; no proteins that regulate excitatory and inhibitory synapse strength in a coordinated reciprocal manner have been identified. Using super-resolution imaging, electrophysiology, and molecular manipulations we show that cadherin-10, encoded by CDH10 within the ASD risk locus 5p14...
October 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29024676/perinatal-fluoxetine-prevents-the-effect-of-pre-gestational-maternal-stress-on-5-ht-in-the-pfc-but-maternal-stress-has-enduring-effects-on-mpfc-synaptic-structure-in-offspring
#5
Mary Gemmel, Nikolaos Kokras, Christina Dalla, Jodi L Pawluski
Maternal affective disorders are frequently treated with selective serotonin reuptake inhibitor medications (SSRIs); with up to 10% of women being prescribed these medications during pregnancy. Infant development depends on the early serotonergic environment, which is altered by perinatal SSRIs, raising concern about how these medications affect neural outcomes. While clinical and preclinical research suggests an impact of SSRIs on the developing brain, more research is needed to determine the effects on neuroplasticity, the serotonergic system, and the hypothalamic-pituitary-adrenal axis in neural regions mediating behavior...
October 9, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28979184/spin90-modulates-long-term-depression-and-behavioral-flexibility-in-the-hippocampus
#6
Dae Hwan Kim, Minkyung Kang, Chong-Hyun Kim, Yun Hyun Huh, In Ha Cho, Hyun-Hee Ryu, Kyung Hwun Chung, Chul-Seung Park, Sangmyung Rhee, Yong-Seok Lee, Woo Keun Song
The importance of actin-binding proteins (ABPs) in the regulation of synapse morphology and plasticity has been well established. SH3 protein interacting with Nck, 90 kDa (SPIN90), an Nck-interacting protein highly expressed in synapses, is essential for actin remodeling and dendritic spine morphology. Synaptic targeting of SPIN90 to spine heads or dendritic shafts depends on its phosphorylation state, leading to blockage of cofilin-mediated actin depolymerization and spine shrinkage. However, the physiological role of SPIN90 in long-term plasticity, learning and memory are largely unknown...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28974728/addressing-the-role-of-the-%C3%AE-helical-extension-in-the-folding-of-the-third-pdz-domain-from-psd-95
#7
Candice Gautier, Lorenzo Visconti, Per Jemth, Stefano Gianni
PDZ domains are one of the most important protein-protein interaction domains in human. While presenting a conserved three dimensional structure, a substantial number of PDZ domains display structural extensions suggested to be involved in their folding and binding mechanisms. The C-terminal α-helix extension (α3) of the third PDZ domain from PSD-95 (PDZ3) has been reported to have a role in function of the domain as well as in the stabilization of the native fold. Here we report an evaluation of the effect of the truncation of this additional helix on the folding and unfolding kinetics of PDZ3...
October 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28973854/proteasome-independent-polyubiquitin-linkage-regulates-synapse-scaffolding-efficacy-and-plasticity
#8
Qi Ma, Hongyu Ruan, Lisheng Peng, Mingjie Zhang, Michaela U Gack, Wei-Dong Yao
Ubiquitination-directed proteasomal degradation of synaptic proteins, presumably mediated by lysine 48 (K48) of ubiquitin, is a key mechanism in synapse and neural circuit remodeling. However, more than half of polyubiquitin (polyUb) species in the mammalian brain are estimated to be non-K48; among them, the most abundant is Lys 63 (K63)-linked polyUb chains that do not tag substrates for degradation but rather modify their properties and activity. Virtually nothing is known about the role of these nonproteolytic polyUb chains at the synapse...
September 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28964752/inhibition-of-nkcc1-promotes-axonal-growth-and-motor-recovery-in-ischemic-rats
#9
X P Mu, H B Wang, X Cheng, L Yang, X Y Sun, H L Qu, S S Zhao, Z K Zhou, T T Liu, T Xiao, B Song, J Jolkkonen, C S Zhao
Bumetanide is a selective inhibitor of the Na(+)-K(+)-Cl(-)-co-transporter 1(NKCC1). We studied whether bumetanide could affect axonal growth and behavioral outcome in stroke rats. Adult male Wistar rats were randomly assigned to four groups: sham-operated rats treated with vehicle or bumetanide, and ischemic rats treated with vehicle or bumetanide. Endothelin-1 was used to induce focal cerebral ischemia. Bumetanide administration (i.c.v.) started on postoperative day 7 and continued for 3 weeks. Biotinylated dextran amine (BDA) was injected into the right imotor cortex on postoperative day 14 to trace corticospinal tract (CST) fibers sprouting into the denervated cervical spinal cord...
September 28, 2017: Neuroscience
https://www.readbyqxmd.com/read/28962170/electro-acupuncture-ameliorates-cognitive-impairment-via-improvement-of-brain-derived-neurotropic-factor-mediated-hippocampal-synaptic-plasticity-in-cerebral-ischemia-reperfusion-injured-rats
#10
Ruhui Lin, Xiaojie Li, Weilin Liu, Wenlie Chen, Kunqiang Yu, Congkuai Zhao, Jia Huang, Shanli Yang, Hongwei Peng, Jing Tao, Lidian Chen
A previous study by our group found that electro-acupuncture (EA) at the Shenting (DU24) and Baihui (DU20) acupoints ameliorates cognitive impairment in rats with cerebral ischemia-reperfusion (I/R) injury. However, the precise mechanism of action has remained largely unknown. The present study investigated whether brain-derived neurotropic factor (BDNF) mediates hippocampal synaptic plasticity as the underlying mechanism. Rats were randomly divided into three groups: The sham operation control (Sham) group, the focal cerebral ischemia-reperfusion (I/R) group, and the I/R with EA treatment (I/R+EA) group...
September 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28957809/geniposide-attenuates-post-ischaemic-neurovascular-damage-via-glun2a-akt-erk-dependent-mechanism
#11
Baosheng Huang, Panhong Chen, Lei Huang, Shuai Li, Ronglan Zhu, Tao Sheng, Wan Yu, Zheng Chen, Tianlu Wang
BACKGROUND/AIMS: Calcium-permeable ionotropic NMDAR-mediated hyperactivity is regarded as the critical factor in modulating the development of ischaemic stroke. Recently, there has been increasing interest in preventing post-stroke neuronal death by focusing on intervening in the function of subpopulations of NMDARs and their downstream signalling. Geniposide, an iridoid glycoside, has been found to have cytoprotective functions in various conditions. However, it is still unclear whether and how geniposide affects neuronal insult under experimental stroke...
September 22, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28957675/spine-dynamics-are-they-all-the-same
#12
REVIEW
Kalen P Berry, Elly Nedivi
Since Cajal's first drawings of Golgi stained neurons, generations of researchers have been fascinated by the small protrusions, termed spines, studding many neuronal dendrites. Most excitatory synapses in the mammalian CNS are located on dendritic spines, making spines convenient proxies for excitatory synaptic presence. When in vivo imaging revealed that dendritic spines are dynamic structures, their addition and elimination were interpreted as excitatory synapse gain and loss, respectively. Spine imaging has since become a popular assay for excitatory circuit remodeling...
September 27, 2017: Neuron
https://www.readbyqxmd.com/read/28955242/shortened-spadin-analogs-display-better-trek-1-inhibition-in-vivo-stability-and-antidepressant-activity
#13
Alaeddine Djillani, Mariel Pietri, Sébastien Moreno, Catherine Heurteaux, Jean Mazella, Marc Borsotto
Depression is a devastating mental disorder that affects 20% of the population worldwide. Despite their proven efficacy, antidepressants present a delayed onset of action and serious adverse effects. Seven years ago, we described spadin (PE 12-28) as a promising endogenous peptide with antidepressant activity. Spadin specifically blocks the TREK-1 channel. Previously, we showed in vivo that, spadin activity disappeared beyond 7 h after administration. In order to improve in vivo spadin stability and bioavailability, we screened spadin analogs and derivatives...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28954225/3-utr-length-dependent-control-of-syngap-isoform-%C3%AE-2-mrna-by-fus-and-elav-like-proteins-promotes-dendritic-spine-maturation-and-cognitive-function
#14
Satoshi Yokoi, Tsuyoshi Udagawa, Yusuke Fujioka, Daiyu Honda, Haruo Okado, Hirohisa Watanabe, Masahisa Katsuno, Shinsuke Ishigaki, Gen Sobue
FUS is an RNA-binding protein associated with frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS). Previous reports have demonstrated intrinsic roles of FUS in synaptic function. However, the mechanism underlying FUS's regulation of synaptic morphology has remained unclear. We found that reduced mature spines after FUS depletion were associated with the internalization of PSD-95 within the dendritic shaft. Mass spectrometry of PSD-95-interacting proteins identified SynGAP, whose expression decreased after FUS depletion...
September 26, 2017: Cell Reports
https://www.readbyqxmd.com/read/28950951/roles-of-nherf-family-of-pdz-binding-proteins-in-regulating-gpcr-functions
#15
David Broadbent, Mohammad M Ahmadzai, Ananth K Kammala, Canchai Yang, Christopher Occhiuto, Rupali Das, Hariharan Subramanian
Multicellular organisms are equipped with an array of G-protein-coupled receptors (GPCRs) that mediate cell-cell signaling allowing them to adapt to environmental cues and ultimately survive. This is mechanistically possible through complex intracellular GPCR machinery that encompasses a vast network of proteins. Within this network, there is a group called scaffolding proteins that facilitate proper localization of signaling proteins for a quick and robust GPCR response. One protein family within this scaffolding group is the PSD-95/Dlg/ZO-1 (PDZ) family which is important for GPCR localization, internalization, recycling, and downstream signaling...
2017: Advances in Immunology
https://www.readbyqxmd.com/read/28943199/effects-of-the-dimeric-psd-95-inhibitor-uccb01-144-on-functional-recovery-after-fimbria-fornix-transection-in-rats
#16
Jens Bak Sommer, Anders Bach, Hana Malá, Kristian Strømgaard, Jesper Mogensen, Darryl S Pickering
Pharmacological inhibition of PSD-95 is a promising therapeutic strategy in the treatment of stroke, and positive effects of monomeric and dimeric PSD-95 inhibitors have been reported in numerous studies. However, whether therapeutic effects will generalize to other types of acute brain injury such as traumatic brain injury (TBI), which has pathophysiological mechanisms in common with stroke, is currently uncertain. We have previously found a lack of neuroprotective effects of dimeric PSD-95 inhibitors in the controlled cortical impact model of TBI in rats...
October 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28934194/arginine-vasopressin-ameliorates-spatial-learning-impairments-in-chronic-cerebral-hypoperfusion-via-v1a-receptor-and-autophagy-signaling-partially
#17
C Yang, X Zhang, J Gao, M Wang, Z Yang
Chronic cerebral hypoperfusion (CCH) is a major factor contributing to neurological disorders and cognitive decline. Autophagy activation is believed to provide both beneficial and detrimental roles during hypoxic/ischemic cellular injury. Although arginine vasopressin (AVP) has been strongly involved in many behaviors, especially in learning and memory, the effects of AVP on CCH and their molecular mechanisms remain unclear. Here, to investigate whether there was neuroprotective effects of AVP on CCH through V1a receptor (an AVP receptor) signaling, permanent bilateral carotid arteries occlusion (two vessel occlusion, 2VO) was used to establish a rat model of CCH, and hypertonic saline (5...
July 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28926000/the-bdnf-val66met-polymorphism-regulates-glucocorticoid-induced-corticohippocampal-remodeling-and-behavioral-despair
#18
M Notaras, X Du, J Gogos, M van den Buuse, R A Hill
The BDNF Val66Met polymorphism has been associated with sensitivity to stress and affective disorders. We therefore sought to model the inter-causality of these relationships under controlled laboratory conditions. We subjected humanized BDNF Val66Met (hBDNF(Val66Met)) transgenic mice to a history of stress, modeled by chronic late-adolescent corticosterone (CORT) exposure, before evaluating affective-related behavior using the forced-swim test (FST) in adulthood. While hBDNF(Met/Met) mice had a depression-like phenotype in the FST irrespective of CORT, hBDNF(Val/Val) wildtype mice had a resilient phenotype but developed an equally robust depressive-like phenotype following CORT...
September 19, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28901367/effects-of-developmental-arsenite-exposure-on-hippocampal-synapses-in-mouse-offspring
#19
Fenghong Zhao, Yingjun Liao, Hongge Tang, Jie Piao, Gaoyang Wang, Yaping Jin
Arsenic exposure through drinking water can impair the learning and memory ability of children in China and other countries. Synaptic plasticity plays a key role in the process of learning and memory. Alterations in the expression of presynaptic and postsynaptic proteins can be used to evaluate synaptic plasticity, and further to evaluate impairment in learning and memory ability. Thereby, the aim of this study was to explore the mechanisms underlying arsenic neurotoxicity by focusing on alterations in the hippocampal synapses of mouse offspring induced by developmental arsenite exposure...
October 18, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28888982/disrupting-nnos-psd-95-coupling-in-the-hippocampal-dentate-gyrus-promotes-extinction-memory-retrieval
#20
Jun Li, Zhou Han, Bo Cao, Cheng-Yun Cai, Yu-Hui Lin, Fei Li, Hai-Ying Wu, Lei Chang, Chun-Xia Luo, Dong-Ya Zhu
Granule cells in the dentate gyrus regenerate constantly in adult hippocampus and then integrate into neural circuits in the hippocampus thereby providing the neural basis for learning and memory. Promoting the neurogenesis in the hippocampus facilitates learning and memory such as spatial learning, object identification, and extinction learning. The interaction between neuronal nitric oxide synthase (nNOS) and postsynaptic density protein-95 (PSD-95) is reported to negatively regulate neurogenesis in brain, so we hypothesized that disrupting this interaction might facilitate the neurogenesis in the dentate gyrus (DG) and thus enhance the extinction memory retrieval of fear learning...
November 4, 2017: Biochemical and Biophysical Research Communications
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