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https://www.readbyqxmd.com/read/29471140/activation-of-endothelial-trkb-receptors-induces-relaxation-of-resistance-arteries
#1
P Totoson, M Pedard, C Marie, C Demougeot
While brain-derived neurotrophic factor (BDNF) was previously reported to induce relaxation of conduit artery, whether the BDNF/TrkB (tropomyosin-related kinase) pathway is involved in the tone control of resistance arteries is not known. This study investigated TrkB receptors levels/localization and the vasomotor effect of the TrkB receptor agonist LM22A-4 in isolated third-order mesenteric arteries from rats. Immunostaining revealed the presence of both full-length and truncated TrkB receptors, especially at the endothelial level...
February 19, 2018: Vascular Pharmacology
https://www.readbyqxmd.com/read/29471082/anhedonic-behavior-and-%C3%AE-amino-butyric-acid-during-a-sensitive-period-in-female-rats-exposed-to-early-adversity
#2
Jodi L Lukkes, Shirisha Meda, Kevin J Norman, Susan L Andersen
Early life adversity increases depressive behavior that emerges during adolescence. Sensitive periods have been associated with fewer GABAergic interneurons, especially parvalbumin (PV), brain derived growth factor, and its receptor, TrkB. Here, maternal separation (MS) and social isolation (ISO) were used to establish a sensitive period for anhedonic depression using the learned helplessness (LH) paradigm. Female Sprague-Dawley rat pups underwent MS for 4-h/day or received typical care (CON) between postnatal days 2-20; for the ISO condition, separate cohorts were individually housed between days 20-40 or served as controls (CON2)...
February 13, 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29471003/trkb-receptor-antagonism-inhibits-stab-injury-induced-proliferative-response-in-adult-zebrafish-danio-rerio-brain
#3
Surendra Kumar Anand, Amal Chandra Mondal
The Tropomyosin related kinase (TrkB) receptor, is known to promote neuronal maturation, differentiation, maintenance and survival through its cognate ligands Brain derived neurotrophic factor (BDNF) and neurotrophin 4 (NT4). BDNF, NT4 and TrkB are highly conserved proteins among vertebrates. Although the role of TrkB during brain development is well established, its role in adult neurogenesis and brain regeneration awaits thorough investigation. In this study, we used the zebrafish stab wound injury model to determine whether the injury induced regeneration response in the telencephalon region is governed by TrkB or not...
February 19, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29468822/phycoerythrin-derived-tryptic-peptide-of-a-red-alga-pyropia-yezoensis-attenuates-glutamate-induced-er-stress-and-neuronal-senescence-in-primary-rat-hippocampal-neurons
#4
Jeong Hwan Oh, Eun-Young Kim, Taek-Jeong Nam
SCOPE: Glutamate-induced excitotoxicity involves in various neurodegenerative disorders. This study aimed to investigate whether a phycoerythrin-derived tryptic peptide of Pyropia yezoensis (PYP) reduces glutamate-induced excitotoxicity and neuronal senescence in primary rat hippocampal neurons. METHODS AND RESULTS: Glutamate exposure (100 μM) decreased cell viability and increased expression of endoplasmic reticulum (ER) stress response protein glucose-regulated protein 78 (GRP78) starting at 60 min following glutamate exposure, which was attenuated by PYP pretreatment (1 μg/mL)...
February 21, 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29468477/ethanol-extract-of-rehmannia-glutinosa-exerts-antidepressant-like-effects-on-a-rat-chronic-unpredictable-mild-stress-model-by-involving-monoamines-and-bdnf
#5
Jun-Ming Wang, Li-Xin Pei, Yue-Yue Zhang, Yong-Xian Cheng, Chun-Ling Niu, Ying Cui, Wei-Sheng Feng, Gui-Fang Wang
The dried roots of Rehmannia glutinosa Libosch. (Scrophulariaceae) are of both medicinal and nutritional importance. Our previous study has found that the 80% ethanol extract of R. glutinosa (RGEE) produced antidepressant-like activities in mouse behavioral despair depression models. However, its mechanisms are still unclear. The present study aimed to observe the antidepressant-like mechanisms of RGEE on a rat chronic unpredictable mild stress (CUMS) model by involving monoaminergic neurotransmitters and brain-derived neurotrophic factor (BDNF)...
February 22, 2018: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29467254/bdnf-activates-an-nfi-dependent-neurodevelopmental-timing-program-by-sequestering-nfatc4
#6
Baojin Ding, Paul R Dobner, Debra Mullikin-Kilpatrick, Wei Wang, Hong Zhu, Chi-Wing Chow, John W Cave, Richard M Gronostajski, Daniel L Kilpatrick
How intrinsic and extrinsic signals are coordinated to regulate synaptic maturation and its timing is an important question for neurodevelopment and its disorders. Here, we investigated the influence of the neurotrophin BDNF on the developmental timing of a dendrite/synapse-related gene program controlled by Nuclear Factor One (NFI) in maturing cerebellar granule neurons (CGNs). BDNF accelerated the onset of NFI-regulated late-gene expression and NFI temporal occupancy in CGN cultures in a MEK5/ERK5-dependent manner...
February 21, 2018: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/29466871/design-of-a-novel-gene-therapy-construct-to-achieve-sustained-brain-derived-neurotrophic-factor-signalling-in-neurons
#7
Andrew Osborne, Aiden Xz Wang, Alessia Tassoni, Peter S Widdowson, Keith R Martin
Brain-derived neurotrophic factor (BDNF) acting through the tropomyosin-related receptor-B (TrkB) is an important signalling system for the maintenance and survival of neurons. Gene therapy using either recombinant adeno-associated viral (AAV) or lentiviral vectors can provide sustained delivery of BDNF to tissues where reduced BDNF signalling is hypothesised to contribute to disease pathophysiology. However, elevation in BDNF at target sites has been shown to lead to a down-regulation of TrkB receptors, thereby reducing the effect of chronic BDNF delivery over time...
February 21, 2018: Human Gene Therapy
https://www.readbyqxmd.com/read/29464486/microrna-322-cluster-promotes-tau-phosphorylation-via-targeting-brain-derived-neurotrophic-factor
#8
Jun Zhang, Zanchao Liu, Yuanyuan Pei, Wen Yang, Chicu Xie, Shiqi Long
Brain-derived neurotrophic factor (BDNF) is a crucial regulator to support synaptic plasticity and neuronal survival, its significant decrease is a pathophysiological hallmark in Alzheimer's disease (AD) brains and accounts for poor prognosis. MicroRNAs (miRNAs) interfere with the translation of target mRNAs and control a variety of physiological and pathological processes. MiR-322 is the rodent homologue of human miR-424, it is involved in the modulation of cell differentiation, proliferation, apoptosis and metabolic activities in diverse tissues and organs...
February 20, 2018: Neurochemical Research
https://www.readbyqxmd.com/read/29463009/docosahexaenoic-acid-helps-to-lessen-extinction-memory-in-rats
#9
Michio Hashimoto, Shahdat Hossain, Masanori Katakura, Abdullah Al Mamun, Osamu Shido
Abstract : Memory extinction is referred to as a learning process in which a conditioned response (CR) progressively reduces over time as an animal learns to uncouple a response from a stimulus. Extinction occurs when the rat is placed into a context without shock after training. Docosahexaenoic acid (DHA, C22:6, n-3) is implicated in memory formation in mammalian brains. In a two-way active shuttle-avoidance apparatus, we examined whether DHA affects the extinction memory and the expression of brain cognition-related proteins, including gastrin-releasing peptide receptor (GRPR), brain-derived neurotrophic factor receptor (BDNFR) tyrosine kinase receptor B (TrKB), and N-methyl-d-aspartate receptor (NMDAR) subunits NR2A and NR2B...
February 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29459269/study-on-antidepressant-activity-of-chiisanoside-in-mice
#10
Xingbo Bian, Xiaofeng Liu, Jinping Liu, Yan Zhao, Haijun Li, Enbo Cai, Pingya Li, Yugang Gao
The antidepressant-like effect of chiisanoside from the leaves of Acanthopanax sessiliflorus was evaluated by using mice models of depression, forced swim test (FST) and tail suspension test (TST). The results showed that treatment with chiisanoside at dose of 5.0 mg/kg significantly decreased immobility time in the FST and TST. Pretreatment with haloperidol (a non-selective D2 receptor antagonist), bicuculline (a competitive GABA antagonist) and N-methyl-D-aspartic acid (NMDA, an agonist at the glutamate site) effectively reversed the antidepressant-like effect of chiisanoside (5...
February 16, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29458098/spermine-protects-from-lps-induced-memory-deficit-via-bdnf-and-trkb-activation
#11
Pâmella K Frühauf-Perez, Fernanda R Temp, Micheli M Pillat, Cristiane Signor, Arithane Lorena Wendel, Henning Ulrich, Carlos F Mello, Maribel A Rubin
Lipopolysaccharide (LPS) has been long known to promote neuroinflammation and learning and memory deficits. Since spermine, one of the main natural polyamines in the central nervous system, protects from LPS-induced memory deficit by a mechanism that comprises GluN2B receptors, the aim of the present study was to determine whether brain-derived neurotrophic factor (BDNF), tropomyosin-related kinase B (TrkB) receptor and cAMP response element binding (CREB) are involved in this protective effect of spermine...
February 16, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29453932/neurotrophin-3-restores-synaptic-plasticity-in-the-striatum-of-a-mouse-model-of-huntington-s-disease
#12
Victor G Gómez-Pineda, Francisco M Torres-Cruz, César I Vivar-Cortés, Elizabeth Hernández-Echeagaray
AIMS: Neurotrophin-3 (NT-3) is expressed in the mouse striatum; however, it is not clear the NT-3 role in striatal physiology. The expression levels of mRNAs and immune localization of the NT-3 protein and its receptor TrkC are altered in the striatum following damage induced by an in vivo treatment with 3-nitropropionic acid (3-NP), a mitochondrial toxin used to mimic the histopathological hallmarks of Huntington's disease (HD). The aim of this study was to evaluate the role of NT-3 on corticostriatal synaptic transmission and its plasticity in both the control and damaged striatum...
February 17, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29444457/brain-region-specific-responses-of-astrocytes-to-an-in-vitro-injury-and-neurotrophins
#13
Andrea Beatriz Cragnolini, Gonzalo Montenegro, Wilma J Friedman, Daniel Hugo Mascó
Astrocytes are a heterogeneous population of glial cells that react to brain insults through a process referred to as astrogliosis. Reactive astrocytes are characterized by an increase in proliferation, size, migration to the injured zone and release of a plethora of chemical mediators such as NGF and BDNF. The aim of this study was to determine whether there are brain region-associated responses of astrocytes to an injury and to the neurotrophins NGF and BDNF. We used the scratch injury model to study the closure of a wound inflicted on a monolayer of astrocytes obtained from cortex, hippocampus or striatum...
February 11, 2018: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/29438801/specific-activity-features-in-the-forced-swim-test-brain-neurotrophins-and-development-of-stress-induced-depressive-like-behavior-in-rats
#14
Mikhail Stepanichev, Anna Manolova, Danil Peregud, Mikhail Onufriev, Sofia Freiman, Viktor Aniol, Yulia Moiseeva, Margarita Novikova, Natalia Lazareva, Natalia Gulyaeva
Selective vulnerability or resilience to mood disorders is related to individual differences or personality. In the present study forced swim test (FST) was used as a tool for division of male rats according to their immobility behavior. The animals were subjected to a chronic unpredictable mild stress (CUS). Depressive-like behavior and modifications in brain neurotrophin system of were examined after CUS exposure. The low immobile (LI) and high immobile (HI) rats demonstrated elusive differences in expression of BDNF ExVI mRNA and TrkA mRNA which was higher in hippocampus and frontal cortex, respectively, of HI rats as compared to LI animals...
February 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29428822/intranasal-bdnf-administration-promotes-visual-function-recovery-in-adult-amblyopic-rats
#15
REVIEW
Gabriele Sansevero, Laura Baroncelli, Manuela Scali, Alessandro Sale
Amblyopia is the most common cause of visual impairment in one eye, with a prevalence of 1-5% in the world population. While amblyopia can be efficiently treated in children, it becomes irreversible in adults, due to the decline in neural plasticity past the end of the visual cortex critical period. Accordingly, no pharmacological approaches are available to rescue visual functions in adult amblyopic subjects. We report that non-invasive intranasal infusion of BDNF increased levels of this neurotrophic factor in V1 and induced a recovery of visual acuity, ocular dominance and visual depth perception in adult amblyopic rats, both in reverse-occluded animals and in those with unrestricted binocular sight...
February 8, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29428223/angiotensin-1-7-ameliorates-6-hydroxydopamine-lesions-in-hemiparkinsonian-rats-through-activation-of-mas-receptor-pi3k-akt-bdnf-pathway-and-inhibition-of-angiotensin-ii-type-1-receptor-nf-%C3%AE%C2%BAb-axis
#16
Mostafa A Rabie, Mai A Abd El Fattah, Noha N Nassar, Hanan S El-Abhar, Dalaal M Abdallah
MAS receptor (MASR), expressed in several brain areas, conferred neuroprotection against neurodegenerative disorders when activated by angiotensin (Ang) 1-7; however, its role in Parkinson's disease (PD) remains elusive. Intra-striatal post-administration of Ang1-7, using a 6-hydroxydopamine (OHDA) PD model, improved motor performance and muscle coordination. On the molecular level, Ang1-7 upregulated the striatal expression of MASR and caused upsurge in its downstream targets (p-PI3K/p-Akt/p-CREB/BDNF) to phosphorylate TrKB, which in a positive feedback upregulates MASR...
February 8, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29427282/neonatal-exposure-to-low-dose-1-2-sevoflurane-increases-rats-hippocampal-neurogenesis-and-synaptic-plasticity-in-later-life
#17
Xi Chen, Xue Zhou, Lu Yang, Xu Miao, Di-Han Lu, Xiao-Yu Yang, Zhi-Bin Zhou, Wen-Bin Kang, Ke-Yu Chen, Li-Hua Zhou, Xia Feng
The increasing usage of general anesthetics on young children and infants has drawn extensive attention to the effects of these drugs on cognitive function later in life. Recent animal studies have revealed improvement in hippocampus-dependent performance after lower concentrations of sevoflurane exposure. However, the long-term effects of low-dose sevoflurane on the developing brain remain elusive. On postnatal day (P) 7, rats were treated with 1.2% sevoflurane (1.2% sevo group), 2.4% sevoflurane (2.4% sevo group), and air control (C group) for 6 h...
February 9, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29425916/genetically-defined-fear-induced-aggression-focus-on-bdnf-and-its-receptors
#18
Tatiana V Ilchibaeva, Anton S Tsybko, Rimma V Kozhemyakina, Elena M Kondaurova, Nina K Popova, Vladimir S Naumenko
Brain-derived neurotrophic factor (BDNF), its precursor proBDNF, BDNF pro-peptide, BDNF mRNA levels, as well as TrkB and p75NTR receptors mRNA and protein levels, were studied in the brain of rats, selectively bred for more than 85 generations for either the high level or the lack of fear-induced aggressive behavior. Furthermore, we have found that rats of aggressive strain demonstrated both high level of aggression toward humans and increased amplitude of acoustic startle response compared to rats selectively bred for the lack of fear-induced aggression...
February 6, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29421611/gpr30-activation-improves-memory-and-facilitates-dhpg-induced-ltd-in-the-hippocampal-ca3-of-middle-aged-mice
#19
Wen Xu, Jian Cao, Yan Zhou, Lina Wang, Guoqi Zhu
Reduced estrogen levels and decreased expression of related receptors are typical cerebral features of aging. The G protein-coupled estrogen receptor 1 (GPER1, also known as GPR30) is considered a novel therapeutic target for neurodegenerative diseases. In this study, we demonstrated that hippocampal GPR30 expression was reduced in middle-aged mice compared with young adult mice. GPR30 agonist G1 improved both fear and spatial memory in both male and female middle-aged mice, but not in young adult mice, which were blocked by the GPR30 antagonist G15...
February 5, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29421605/impaired-insulin-signaling-and-spatial-learning-in-middle-aged-rats-the-role-of-ptp1b
#20
Gabriel Keine Kuga, Vitor Rosetto Muñoz, Rafael Calais Gaspar, Susana Castelo Branco Ramos Nakandakari, Adelino Sanchez Ramos da Silva, José Diego Botezelli, José Alexandre Curiacos de Almeida Leme, Ricardo José Gomes, Leandro Pereira de Moura, Dennys Esper Cintra, Eduardo Rochete Ropelle, José Rodrigo Pauli
The insulin and Brain-Derived Neurotrophic Factor (BDNF) signaling in the hippocampus promotes synaptic plasticity and memory formation. On the other hand, aging is related to the cognitive decline and is the main risk factor for Alzheimer's Disease (AD). The Protein-Tyrosine Phosphatase 1B (PTP1B) is related to several deleterious processes in neurons and emerges as a promising target for new therapies. In this context, our study aims to investigate the age-related changes in PTP1B content, insulin signaling, β-amyloid content, and Tau phosphorylation in the hippocampus of middle-aged rats...
February 5, 2018: Experimental Gerontology
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