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https://www.readbyqxmd.com/read/29666640/investigating-the-interactive-effects-of-sex-steroid-hormones-and-brain-derived-neurotrophic-factor-during-adolescence-on-hippocampal-nmda-receptor-expression
#1
Cushla R McCarthny, Xin Du, YeeWen Candace Wu, Rachel A Hill
Sex steroid hormones have neuroprotective properties which may be mediated by brain-derived neurotrophic factor (BDNF). This study sought to determine the interactive effects of preadolescent hormone manipulation and BDNF heterozygosity (+/- ) on hippocampal NMDA-R expression. Wild-type and BDNF+/- mice were gonadectomised, and females received either 17 β -estradiol or progesterone treatment, while males received either testosterone or dihydrotestosterone (DHT) treatment. Dorsal (DHP) and ventral hippocampus (VHP) were dissected, and protein expression of GluN1, GluN2A, GluN2B, and PSD-95 was assessed by Western blot analysis...
2018: International Journal of Endocrinology
https://www.readbyqxmd.com/read/29666360/signaling-pathways-responsible-for-the-rapid-antidepressant-like-effects-of-a-glun2a-preferring-nmda-receptor-antagonist
#2
Marta Gordillo-Salas, Fuencisla Pilar-Cuéllar, Yves P Auberson, Albert Adell
In a previous study we found that the preferring GluN2A receptor antagonist, NVP-AAM077, elicited rapid antidepressant-like effects in the forced swim test that was related to the release of glutamate and serotonin in the medial prefrontal cortex. In the present work we sought to examine the duration of this behavioral effect as well as the molecular readouts involved. Our results showed that NVP-AAM077 reduced the immobility in the forced swim test 30 min and 24 h after its administration. However, this effect waned 7 days later...
April 18, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29666144/sporadic-amyotrophic-lateral-sclerosis-sals-skeletal-muscle-response-to-cerebrospinal-fluid-from-sals-patients-in-a-rat-model
#3
Shruthi Shanmukha, Gayathri Narayanappa, Atchayaram Nalini, Phalguni Anand Alladi, Trichur R Raju
Skeletal muscle atrophy is the most prominent feature of amyotrophic lateral sclerosis (ALS), an adult-onset neurodegenerative disease of motor neurons. However, the contribution of skeletal muscle to disease progression remains elusive. Our previous studies have shown that intrathecal injection of cerebrospinal fluid from sporadic ALS patients (ALS-CSF) induces several degenerative changes in motor neurons and glia of neonatal rats. Here, we describe various pathologic events in the rat extensor digitorum longus muscle following intrathecal injection of ALS-CSF...
April 16, 2018: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29662942/measuring-and-validating-the-levels-of-brain-derived-neurotrophic-factor-in-human-serum
#4
Yvonne Naegelin, Hayley Dingsdale, Katharina Säuberli, Sabine Schädelin, Ludwig Kappos, Yves-Alain Barde
Brain-derived neurotrophic factor (BDNF) secreted by neurons is a significant component of synaptic plasticity. In humans, it is also present in blood platelets where it accumulates following its biosynthesis in megakaryocytes. BDNF levels are thus readily detectable in human serum and it has been abundantly speculated that they may somehow serve as an indicator of brain function. However, there is a great deal of uncertainty with regard to the range of BDNF levels that can be considered normal, how stable these values are over time and even whether BDNF levels can be reliably measured in serum...
March 2018: ENeuro
https://www.readbyqxmd.com/read/29662939/ltp-or-ltd-modeling-the-influence-of-stress-on-synaptic-plasticity
#5
Achim Peters, Cordula Reisch, Dirk Langemann
In cognitive memory, long-term potentiation (LTP) has been shown to occur when presynaptic and postsynaptic activities are highly correlated and glucocorticoid concentrations are in an optimal (i.e., low normal) range. In all other conditions, LTP is attenuated or even long-term depression (LTD) occurs. In this paper, we focus on NMDA receptor (NMDA-R)-dependent LTP and LTD, two processes involving various molecular mechanisms. To understand which of these mechanisms are indispensable for explaining the experimental evidence reported in the literature, we here propose a parsimonious model of NMDA-R-dependent synaptic plasticity...
January 2018: ENeuro
https://www.readbyqxmd.com/read/29662325/sonic-hedgehog-signaling-in-spinal-cord-contributes-to-morphine-induced-hyperalgesia-and-tolerance-through-upregulating-brain-derived-neurotrophic-factor-expression
#6
Su Liu, Jun-Li Yao, Xin-Xin Wan, Zhi-Jing Song, Shuai Miao, Ye Zhao, Xiu-Li Wang, Yue-Peng Liu
Purpose: Preventing opioid-induced hyperalgesia and tolerance continues to be a major clinical challenge, and the underlying mechanisms of hyperalgesia and tolerance remain elusive. Here, we investigated the role of sonic hedgehog (Shh) signaling in opioid-induced hyperalgesia and tolerance. Methods: Shh signaling expression, behavioral changes, and neurochemical alterations induced by morphine were analyzed in male adult CD-1 mice with repeated administration of morphine...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29661832/kinase-activity-in-the-olfactory-bulb-is-required-for-odor-memory-consolidation
#7
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/29661830/sustained-adrenergic-signaling-promotes-intratumoral-innervation-through-bdnf-induction
#8
Julie K Allen, Guillermo N Armaiz-Pena, Archana S Nagaraja, Nouara C Sadaoui, Tatiana Ortiz, Robert Dood, Merve Ozcan, Danielle M Herder, Monika Haemerrle, Kshipra M Gharpure, Rajesha Rupaimoole, Rebecca Previs, Sherry Y Wu, Sunila Pradeep, Xiaoyun Xu, Hee Dong Han, Behrouz Zand, Heather J Dalton, Morgan Taylor, Wei Hu, Justin Bottsford-Miller, Myrthala Moreno-Smith, Yu Kang, Lingegowda S Mangala, Cristian Rodriguez-Aguayo, Vasudha Sehgal, Erika L Spaeth, Prahlad T Ram, Stephen Tc Wong, Frank C Marini, Gabriel Lopez-Berestein, Steve W Cole, Susan K Lutgendorf, Mariella diBiasi, Anil K Sood
Mounting clinical and preclinical evidence supports a key role for sustained adrenergic signaling in the tumor microenvironment as a driver of tumor growth and progression. However, the mechanisms by which adrenergic neurotransmitters are delivered to the tumor microenvironment are not well understood. Here we present evidence for a feedforward loop whereby adrenergic signaling leads to increased tumoral innervation. In response to catecholamines, tumor cells produced brain-derived neurotrophic factor (BDNF) in an ADRB3/cAMP/Epac/JNK-dependent manner...
April 16, 2018: Cancer Research
https://www.readbyqxmd.com/read/29658083/antidiabetic-properties-of-low-molecular-weight-bdnf-mimetics-depend-on-the-type-of-activation-of-post-receptor-signaling-pathways
#9
R U Ostrovskaya, S S Yagubova, T A Gudasheva, S B Seredenin
Reduced proliferation and enhanced apoptosis of β cells in diabetes mellitus are associated with a deficiency of brain-derived neurotrophic factor (BDNF). Low-molecular weight compounds similar to different BDNF loops were synthesized at the V. V. Zakusov Research Institute of Pharmacology. They produce a potentiating effect on TrkB phosphorylation, but differently activate post-receptor signaling pathways. We compared their effects on the severity of streptozotocin-induced diabetes mellitus in C57Bl/6 mice...
April 16, 2018: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29656620/the-effect-of-recombinant-tyrosine-hydroxylase-expression-on-the-neurogenic-differentiation-potency-of-mesenchymal-stem-cells
#10
Gizem Turac, Gokhan Duruksu, Erdal Karaoz
OBJECTIVE: Tyrosine hydroxylase (TH) is a rate-limiting enzyme in dopamine synthesis, making the enhancement of its activity a target for ensuring sufficient dopamine levels. Rat bone marrow mesenchymal stem cells (rBM-MSCs) are known to synthesize TH after differentiating into neuronal cells through chemical induction, but the effect of its ectopic expression on these cells has not yet been determined. This study investigated the effects of ectopic recombinant TH expression on the stemness characteristics of rBM-MSCs...
March 2018: Neurospine
https://www.readbyqxmd.com/read/29656414/add-on-memantine-treatment-for-bipolar-ii-disorder-comorbid-with-alcohol-dependence-a-12-week-follow-up-study
#11
Sheng-Yu Lee, Tzu-Yun Wang, Shiou-Lan Chen, Yun-Hsuan Chang, Po-See Chen, San-Yuan Huang, Nian-Sheng Tzeng, Liang-Jen Wang, I Hui Lee, Kao Ching Chen, Yen Kuang Yang, Jau-Shyong Hong, Ru-Band Lu
BACKGROUND: Bipolar disorder (BD), especially BD-II, is frequently comorbid with alcohol dependence. Because BD-II and alcohol dependence are neurodegenerative disorders, agents with anti-inflammatory and neurotrophic effects might provide effective therapy. We investigated whether add-on memantine to regular valproate (VPA) treatment ameliorated clinical symptoms, reduced alcohol use and cytokine levels, and increased plasma brain-derived neurotrophic factor (BDNF) in BD-II patients with comorbid alcohol dependence...
April 15, 2018: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/29656188/inhibition-of-the-dopamine-transporter-as-an-animal-model-of-bipolar-disorder-mania-locomotor-response-neuroimmunological-profile-and-pharmacological-modulation
#12
Juliana R Bastos, Katherinne M Perico, Érica L Marciano Vieira, Antônio L Teixeira, Fabiana S Machado, Aline S de Miranda, Fabrício A Moreira
Inhibition of dopamine transporter (DAT) by GBR12909 has been proposed as a pharmacological model of mania related to bipolar disorder (BD). Here we tested the hypothesis that GBR12909 injection impairs habituation and induces hyperlocomotion in mice, along with changes in cytokines and neurotrophic factors levels, as observed in BD patients. We also tested if lithium carbonate, sodium valproate and aripiprazole prevent GBR12909-induced locomotion. Male Swiss mice received GBR12909 (15 mg/kg) injections and locomotor responses were quantified in an open field...
April 6, 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29655945/long-term-westernized-diet-leads-to-region-specific-changes-in-brain-signaling-mechanisms
#13
Stine Normann Hansen, David Højland Ipsen, Anne Marie Schou-Pedersen, Jens Lykkesfeldt, Pernille Tveden-Nyborg
Western diets, high in fat and energy, are associated with cognitive deficits in humans and animal models, but the underlying mechanisms are not fully elucidated. This includes whether diet-induced dyslipidemia per se negatively impacts brain signaling. Here we investigate the effects of dyslipidemia induced by two high fat diets with or without high sucrose on hippocampal and frontal cortical oxidative stress, brain-derived neurotrophic factor (BDNF) and down-stream markers of synaptic plasticity, as well as alterations in monoaminergic neurotransmitter levels...
April 12, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29651947/transplantation-of-bdnf-gene-recombinant-mesenchymal-stem-cells-and-adhesive-peptide-modified-hydrogel-scaffold-for-spinal-cord-repair
#14
Li-Ming Li, Ling-Ling Huang, Xin-Chi Jiang, Jia-Chen Chen, Hong-Wei OuYang, Jian-Qing Gao
Mesenchymal stem cells (MSCs) are promising candidates for nerve tissue engineering. Brain derived neurotrophic factor (BDNF) secreted by MSCs can function to increase neural differentiation and relieve inflammation response. Gene transfection technology is an efficient strategy to increase the secretion levels of cytokines and enhance cellular functions. However, transfection and in vivo gene expression of environmentally sensitive stem cells have been one of the most challenging subjects due to the requirement in both safety and transfection efficiency...
April 13, 2018: Current Gene Therapy
https://www.readbyqxmd.com/read/29649711/the-interaction-of-bdnf-val66met-ptsd-and-child-abuse-on-psychophysiological-reactivity-and-hpa-axis-function-in-a-sample-of-gulf-war-veterans
#15
Dmitri A Young, Thomas C Neylan, Aoife O'Donovan, Thomas Metzler, Anne Richards, Jessica A Ross, Sabra S Inslicht
INTRODUCTION: While the BDNF Val66Met polymorphism has been linked to various psychological disorders, limited focus has been on its relationship to posttraumatic stress disorder (PTSD) and early traumas such as child abuse. Therefore, we assessed whether Val66Met was associated with fear potentiated psychophysiological response and HPA axis dysfunction and whether PTSD status or child abuse history moderated these outcomes in a sample of Veterans. METHODS: 226 and 173 participants engaged in a fear potentiated acoustic startle paradigm and a dexamethasone suppression test (DST) respectively...
April 3, 2018: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29649627/overexpression-of-hipk2-attenuates-spinal-cord-injury-in-rats-by-modulating-apoptosis-oxidative-stress-and-inflammation
#16
Renbo Li, Jingbo Shang, Wei Zhou, Li Jiang, Donghui Xie, Guanjun Tu
HIPK2 is considered to be a tumor suppressor. It also has been implicated in several functions such as apoptosis and inflammation that are linked to spinal cord injury (SCI). However, whether HIPK2 ameliorates the neurological pain of SCI remains unclear. Here, we investigated the effects of HIPK2 on neurological function, oxidative stress, levels of inflammatory cytokines and expression of Bcl-2/Bax in an SCI model. Firstly, we evaluated the therapeutic effects of HIPK2 on neurological pain in the SCI rat using the Basso, Beattie and Bresnahan scores and H & E staining...
April 9, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29648983/enhancement-of-brain-d-serine-mediates-recovery-of-cognitive-function-after-tbi
#17
Sigal Liraz-Zaltsman, Barbara Slusher, Dana Atrakchi-Baranes, Kinneret Rosenblatt, Yael Friedman Levi, Efrat Leah Kesner, Alcino J Silva, Anat Biegon, Esther Shohami
Cognitive deficits, especially memory loss, are common and devastating neuropsychiatric sequelae of traumatic brain injury (TBI). The deficits may persist for a long time and may be accompanied by increased risk of developing early onset dementia. Past attempts to reverse the neuropsychological effects of brain injury with glutamate-N-methyl-D-aspartate (NMDA) antagonists failed to show any benefits or worsened the outcome, suggesting activation, rather than blockage, of the NMDA receptor (NMDAR) may be useful in the sub-acute period after TBI and stroke...
March 14, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29648487/bdnf-expression-increases-without-changes-in-play-behavior-following-concussion-in-juvenile-rats-rattus-norvegicus-brief-report
#18
Allison C F Dyck, Tammy L Ivanco
PURPOSE: Young children have a high risk of concussion or mild traumatic brain injury (mTBI). Children often appear healthy soon after mTBI, but some have pervasive cognitive and/or motor impairments. Understanding underlying mechanisms recruited after concussion may help for return to play protocols and mitigating what might be lifelong impairments. METHODS: We investigated molecular and behavioral changes in a rat model of childhood concussion. Rats received an injury or sham procedure at an age approximately equivalent to the human period of early childhood...
April 12, 2018: Developmental Neurorehabilitation
https://www.readbyqxmd.com/read/29643935/changes-in-fatigue-autonomic-functions-and-blood-biomarkers-due-to-sitting-isometric-yoga-in-patients-with-chronic-fatigue-syndrome
#19
Takakazu Oka, Tokusei Tanahashi, Nobuyuki Sudo, Battuvshin Lkhagvasuren, Yu Yamada
Background: In a previous randomized controlled trial, we found that sitting isometric yoga improves fatigue in patients with chronic fatigue syndrome (CFS) who are resistant to conventional therapy. The aim of this study was to investigate possible mechanisms behind this finding, focusing on the short-term fatigue-relieving effect, by comparing autonomic nervous function and blood biomarkers before and after a session of isometric yoga. Methods: Fifteen patients with CFS who remained symptomatic despite at least 6 months of conventional therapy practiced sitting isometric yoga (biweekly 20 min practice with a yoga instructor and daily home practice) for eight weeks...
2018: BioPsychoSocial Medicine
https://www.readbyqxmd.com/read/29643759/changes-in-h-reflex-recruitment-after-trans-spinal-direct-current-stimulation-with-multiple-electrode-configurations
#20
Alexander Kuck, Dick F Stegeman, Herman van der Kooij, Edwin H F van Asseldonk
Trans-spinal direct current stimulation (tsDCS) is an electro-modulatory tool with possible application in the rehabilitation of spinal cord injury. TsDCS generates a small electric field, aiming to induce lasting, functional neuromodulation in the targeted neuronal networks. Earlier studies have shown significant modulatory effects after application of lumbar tsDCS. However, for clinical application, a better understanding of application specific factors is required. Our goal was to investigate the effect of different electrode configurations using lumbar spinal tsDCS on spinal excitability...
2018: Frontiers in Neuroscience
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