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https://www.readbyqxmd.com/read/29781786/sitagliptin-rescues-memory-deficits-in-parkinsonian-rats-via-upregulating-bdnf-to-prevent-neuron-and-dendritic-spine-loss
#1
Jing Li, Shuhu Zhang, Chenye Li, Mei Li, Lan Ma
OBJECTIVES: Parkinson's disease (PD) is a neurodegenerative disease with high morbidity among adults worldwide that causes tremendous trouble to people's lives. The purpose of this study was to investigate the impact of sitagliptin on PD and its potential mechanism. METHODS: First, the memory of rats in each group was evaluated with the Morris water maze (MWM) test and the passive avoidance test. Then, both brain-derived neurotrophic factor (BDNF) protein and mRNA levels were detected by ELISA and qPCR assays, respectively...
May 21, 2018: Neurological Research
https://www.readbyqxmd.com/read/29661832/kinase-activity-in-the-olfactory-bulb-is-required-for-odor-memory-consolidation
#2
Michelle T Tong, Tae-Young P Kim, Thomas A Cleland
Long-term fear memory formation in the hippocampus and neocortex depends upon brain-derived neurotrophic factor (BDNF) signaling after acquisition. Incremental, appetitive odor discrimination learning is thought to depend substantially on the differentiation of adult-born neurons within the olfactory bulb (OB)-a process that is closely associated with BDNF signaling. We sought to elucidate the role of neurotrophin signaling within the OB on odor memory consolidation. Male mice were trained on odor-reward associative discriminations after bilateral infusion of the kinase inhibitor K252a, or vehicle control, into the OB...
May 2018: Learning & Memory
https://www.readbyqxmd.com/read/28846707/kek-6-a-truncated-trk-like-receptor-for-drosophila-neurotrophin-2-regulates-structural-synaptic-plasticity
#3
Suzana Ulian-Benitez, Simon Bishop, Istvan Foldi, Jill Wentzell, Chinenye Okenwa, Manuel G Forero, Bangfu Zhu, Marta Moreira, Mark Phizacklea, Graham McIlroy, Guiyi Li, Nicholas J Gay, Alicia Hidalgo
Neurotrophism, structural plasticity, learning and long-term memory in mammals critically depend on neurotrophins binding Trk receptors to activate tyrosine kinase (TyrK) signaling, but Drosophila lacks full-length Trks, raising the question of how these processes occur in the fly. Paradoxically, truncated Trk isoforms lacking the TyrK predominate in the adult human brain, but whether they have neuronal functions independently of full-length Trks is unknown. Drosophila has TyrK-less Trk-family receptors, encoded by the kekkon (kek) genes, suggesting that evolutionarily conserved functions for this receptor class may exist...
August 2017: PLoS Genetics
https://www.readbyqxmd.com/read/26742522/clozapine-improves-memory-impairment-and-reduces-a%C3%AE-level-in-the-tg-appswe-ps1de9-mouse-model-of-alzheimer-s-disease
#4
Yura Choi, Ha Jin Jeong, Quan Feng Liu, Seung Tack Oh, Byung-Soo Koo, Yeni Kim, In-Won Chung, Yong Sik Kim, Songhee Jeon
Alzheimer's disease (AD) is a progressive degenerative condition. In order to treat AD, the use of a "drug repositioning" or "repurposing" approach with potential disease-modifying compounds has been increased. The new generation antipsychotics are commonly used in AD and other dementias for the treatment of psychosis and behavioral symptoms, and several animal models have shown the effects of these potential disease-modifying compounds. In this study, we examined whether long-term clozapine treatment could reduce amyloid beta (Aβ) deposition and cognitive impairment in transgenic mice of AD, Tg-APPswe/PS1dE9...
January 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/26399960/neurotrophins-and-b-cell-malignancies
#5
REVIEW
Jennifer Hillis, Michael O'Dwyer, Adrienne M Gorman
Neurotrophins and their receptors act as important proliferative and pro-survival factors in a variety of cell types. Neurotrophins are produced by multiple cell types in both pro- and mature forms, and can act in an autocrine or paracrine fashion. The p75(NTR) and Trk receptors can elicit signalling in response to the presence or absence of their corresponding neurotrophin ligands. This signalling, along with neurotrophin and receptor expression, varies between different cell types. Neurotrophins and their receptors have been shown to be expressed by and elicit signalling in B lymphocytes...
January 2016: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/26343602/7-8-dihydroxyflavone-reduces-sleep-during-dark-phase-and-suppresses-orexin-a-but-not-orexin-b-in-mice
#6
Pingfu Feng, Afaf A Akladious, Yufen Hu, Yousef Raslan, James Feng, Phillip J Smith
Brain-derived neurotrophic factor (BDNF) binds to Tropomyosin-receptor-kinase B (TrkB) receptors that regulate synaptic strength and plasticity in the mammalian nervous system. 7,8-Dihydroxyflavone (DHF) is a recently identified small molecule Trk B agonist that has been reported to ameliorate depression, attenuate the fear response, improve memory consolidation, and exert neuroprotective effects. Poor and disturbed sleep remains a symptom of major depressive disorder and most current antidepressants affect sleep...
October 2015: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/26293123/human-neural-stem-cells-alleviate-alzheimer-like-pathology-in-a-mouse-model
#7
Il-Shin Lee, Kwangsoo Jung, Il-Sun Kim, Haejin Lee, Miri Kim, Seokhwan Yun, Kyujin Hwang, Jeong Eun Shin, Kook In Park
BACKGROUND: Alzheimer's disease (AD) is an inexorable neurodegenerative disease that commonly occurs in the elderly. The cognitive impairment caused by AD is associated with abnormal accumulation of amyloid-β (Aβ) and hyperphosphorylated tau, which are accompanied by inflammation. Neural stem cells (NSCs) are self-renewing, multipotential cells that differentiate into distinct neural cells. When transplanted into a diseased brain, NSCs repair and replace injured tissues after migration toward and engraftment within lesions...
2015: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/26135675/harpagoside-ameliorates-the-amyloid-%C3%AE-induced-cognitive-impairment-in-rats-via-up-regulating-bdnf-expression-and-mapk-pi3k-pathways
#8
J Li, X Ding, R Zhang, W Jiang, X Sun, Z Xia, X Wang, E Wu, Y Zhang, Y Hu
So far, no effective disease-modifying therapies for Alzheimer's disease (AD) aiming at protecting or reversing neurodegeneration of the disease have been established yet. The present work aims to elucidate the effect of Harpagoside (abbreviated HAR), an iridoid glycosides purified from the Chinese medicinal herb Scrophularia ningpoensis, on neurodegeneration induced by β-amyloid peptide (Aβ) and the underlying molecular mechanism. Here we show that HAR exerts neuroprotective effects against Aβ neurotoxicity...
September 10, 2015: Neuroscience
https://www.readbyqxmd.com/read/26087462/beneficial-behavioral-neurochemical-and-molecular-effects-of-1-r-aminoindan-in-aged-mice
#9
Felix Badinter, Tamar Amit, Orit Bar-Am, Moussa B H Youdim, Orly Weinreb
Previous neuroprotective studies demonstrated that 1-(R)-aminoindan (AI), which is the major metabolite of the anti-Parkinsonian drug rasagiline, possesses beneficial pharmacological effects in various cell culture and animal models of neurodegeneration. The present study was aimed at investigating the possible neuroprotective effects of AI on cognitive impairments and neurochemical alterations in aged mice. Our findings provide evidence that following chronic systemic treatment with AI (5 mg/kg; daily; 3 months) of aged mice (24 months old), the compound exerted a significant positive impact on neuropsychiatric functions and cognitive behavior deficits, assessed in a variety of tasks (spatial learning and memory retention, working memory, learning abilities and nest building behavior) and produced an antidepressant-like effect...
December 2015: Neuropharmacology
https://www.readbyqxmd.com/read/25483396/neural-progenitor-cell-transplantation-promotes-neuroprotection-enhances-hippocampal-neurogenesis-and-improves-cognitive-outcomes-after-traumatic-brain-injury
#10
Meghan O Blaya, Pantelis Tsoulfas, Helen M Bramlett, W Dalton Dietrich
Transplantation of neural progenitor cells (NPCs) may be a potential treatment strategy for traumatic brain injury (TBI) due to their intrinsic advantages, including the secretion of neurotrophins. Neurotrophins are critical for neuronal survival and repair, but their clinical use is limited. In this study, we hypothesized that pericontusional transplantation of NPCs genetically modified to secrete a synthetic, human multineurotrophin (MNTS1) would overcome some of the limitations of traditional neurotrophin therapy...
February 2015: Experimental Neurology
https://www.readbyqxmd.com/read/25451296/evidence-for-the-contribution-of-adult-neurogenesis-and-hippocampal-cell-death-in-experimental-cerebral-malaria-cognitive-outcome
#11
A S de Miranda, F Brant, A C Campos, L B Vieira, N P Rocha, D Cisalpino, N S Binda, D H Rodrigues, R M Ransohoff, F S Machado, M A Rachid, A L Teixeira
Cognitive dysfunction is a major sign of cerebral malaria (CM). However, the underlying mechanisms of CM cognitive outcome remain poorly understood. A body of evidence suggests that adult neurogenesis may play a role in learning and memory processes. It has also been reported that these phenomena can be regulated by the immune system. We hypothesized that memory dysfunction in CM results from hippocampal neurogenesis impairment mediated by the deregulated immune response during the acute phase of CM. C57Bl/6 mice were infected with Plasmodium berghei ANKA (PbA) strain, using a standardized inoculation of 10(6) parasitized erythrocytes...
January 22, 2015: Neuroscience
https://www.readbyqxmd.com/read/24668485/modulation-of-neurotrophin-signaling-by-monoclonal-antibodies
#12
REVIEW
A Rosenthal, J C Lin
The neurotrophin family is comprised of the structurally related secreted proteins nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and neurotrophine-4 (NT-4). They bind and activate the tyrosine kinase receptors Trk A, B, and C in a ligand-specific manner and additionally bind a shared p75NTR receptor. The neurotrophins were originally defined by their ability to support the survival and maturation of embryonic neurons. However, they also control important physiological functions of the adult nervous system including learning and memory, sensation, and energy homeostasis...
2014: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/24381548/bdnf-dependent-consolidation-of-fear-memories-in-the-perirhinal-cortex
#13
Brigitte Schulz-Klaus, Volkmar Lessmann, Thomas Endres
In the recent years the perirhinal cortex (PRh) has been identified as a crucial brain area in fear learning. Since the neurotrophin brain-derived neurotrophic factor (BDNF) is an important mediator of synaptic plasticity and also crucially involved in memory consolidation of several learning paradigms, we analyzed now whether fear conditioning influences the expression of BDNF protein in the PRh. Here we observed a specific increase of BDNF protein 120 min after fear conditioning training. In order to test whether this increase of BDNF protein level is also required for the consolidation of the fear memory, we locally applied the Trk receptor inhibitor k252a into the PRh during this time window in a second series of experiments...
2013: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/23731954/improvement-of-cognitive-function-and-physical-activity-of-aging-mice-by-human-neural-stem-cells-over-expressing-choline-acetyltransferase
#14
Dongsun Park, Yun-Hui Yang, Dae Kwon Bae, Sun Hee Lee, Goeun Yang, Jangbeen Kyung, Dajeong Kim, Ehn-Kyoung Choi, Seong Won Lee, Gon Hyung Kim, Jin Tae Hong, Kyung-Chul Choi, Hong Jun Lee, Seung U Kim, Yun-Bae Kim
Aging is characterized by progressive loss of cognitive and memory functions as well as decrease in physical activities. In the present study, a human neural stem cell line (F3 NSC) over-expressing choline acetyltransferase (F3.ChAT), an enzyme responsible for acetylcholine synthesis, was generated and transplanted in the brain of 18-month-old male ICR mice. Four weeks post-transplantation, neurobehavioral functions, expression of ChAT enzyme, production of acetylcholine and neurotrophic factors, and expression of cholinergic nervous system markers in transplanted animals were investigated...
November 2013: Neurobiology of Aging
https://www.readbyqxmd.com/read/23684954/aquaporin-4-water-channels-and-synaptic-plasticity-in-the-hippocampus
#15
REVIEW
Helen E Scharfman, Devin K Binder
Aquaporin-4 (AQP4) is the major water channel expressed in the central nervous system (CNS) and is primarily expressed in glial cells. Many studies have shown that AQP4 regulates the response of the CNS to insults or injury, but far less is known about the potential for AQP4 to influence synaptic plasticity or behavior. Recent studies have examined long-term potentiation (LTP), long-term depression (LTD), and behavior in AQP4 knockout (KO) and wild-type mice to gain more insight into its potential role. The results showed a selective effect of AQP4 deletion on LTP of the Schaffer collateral pathway in hippocampus using an LTP induction protocol that simulates pyramidal cell firing during theta oscillations (theta-burst stimulation; TBS)...
December 2013: Neurochemistry International
https://www.readbyqxmd.com/read/23669064/neurotrophins-play-differential-roles-in-short-and-long-term-recognition-memory
#16
Charlotte K Callaghan, Aine M Kelly
The neurotrophin family of proteins are believed to mediate various forms of synaptic plasticity in the adult brain. Here we have assessed the roles of these proteins in object recognition memory in the rat, using icv infusions of function-blocking antibodies or the tyrosine kinase antagonist, tyrphostin AG879, to block Trk receptors. We report that tyrphostin AG879 impairs both short-term and long-term recognition memory, indicating a requirement for Trk receptor activation in both processes. The effect of inhibition of each of the neurotrophins with activity-blocking neutralising antibodies was also tested...
September 2013: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/23651534/acute-and-subacute-il-1%C3%AE-administrations-differentially-modulate-neuroimmune-and-neurotrophic-systems-possible-implications-for-neuroprotection-and-neurodegeneration
#17
Cai Song, Ye Zhang, Yilong Dong
BACKGROUND: In Alzheimer's disease, stroke and brain injuries, activated microglia can release proinflammatory cytokines, such as interleukin (IL)-1β. These cytokines may change astrocyte and neurotrophin functions, which influences neuronal survival and induces apoptosis. However, the interaction between neuroinflammation and neurotrophin functions in different brain conditions is unknown. The present study hypothesized that acute and subacute elevated IL-1β differentially modulates glial and neurotrophin functions, which are related to their role in neuroprotection and neurodegeneration...
2013: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/23643896/stimulatory-effect-of-gonadal-hormones-on-fetal-rat-hippocampal-neural-proliferation-requires-neurotrophin-receptor-activation-in-vitro
#18
Meixia Pan, Caixia Zhang
To determine the effects of gonadal hormones on proliferation of the hippocampal neural cells, which are of importance in learning and memory function. 17β-Estradiol or testosterone was added to the culture at various concentrations. Their proliferation and protective effects on the neural cell were determined with BrdU, flow cytometry and MTT assay. Effects of the gonadal hormones on brain-derived neurotrophic factor (BDNF) expression were determined using ELISA and RT-PCR respectively. 17β-Estradiol and testosterone at 20nM or higher concentrations significantly increased the neural cell proliferation and viability, and induced increasing in the S phase arrest which is essential for cell proliferation...
June 24, 2013: Neuroscience Letters
https://www.readbyqxmd.com/read/23387385/plasticity-and-metaplasticity-of-adult-rat-hippocampal-mossy-fibers-induced-by-neurotrophin-3
#19
L E Ramos-Languren, M L Escobar
Changes in synaptic efficacy and morphology are considered as the downstream mechanisms of consolidation of memories and other adaptive behaviors. In the last decade, neurotrophin-3 (NT-3) has emerged as one potent mediator of synaptic plasticity. In the adult brain, expression of NT-3 is largely confined to the hippocampal dentate gyrus (DG). Our previous studies show that application of high-frequency stimulation (HFS) sufficient to elicit long-term potentiation (LTP) at the DG-CA3 pathway as well as acute intrahippocampal microinfusion of brain-derived neurotrophin factor produce mossy fiber (MF) structural reorganization...
April 2013: European Journal of Neuroscience
https://www.readbyqxmd.com/read/23035088/extinction-of-aversive-memories-associated-with-morphine-withdrawal-requires-erk-mediated-epigenetic-regulation-of-brain-derived-neurotrophic-factor-transcription-in-the-rat-ventromedial-prefrontal-cortex
#20
Wei-Sheng Wang, Shuo Kang, Wen-Tao Liu, Mu Li, Yao Liu, Chuan Yu, Jie Chen, Zhi-Qiang Chi, Ling He, Jing-Gen Liu
Recent evidence suggests that histone deacetylase (HDAC) inhibitors facilitate extinction of rewarding memory of drug taking. However, little is known about the role of chromatin modification in the extinction of aversive memory of drug withdrawal. In this study, we used conditioned place aversion (CPA), a highly sensitive model for measuring aversive memory of drug withdrawal, to investigate the role of epigenetic regulation of brain-derived neurotrophic factor (BDNF) gene expression in extinction of aversive memory...
October 3, 2012: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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