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Tyrosine AND cognition

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https://www.readbyqxmd.com/read/29782882/prolonged-increase-in-ser31-tyrosine-hydroxylase-phosphorylation-in-substantia-nigra-following-cessation-of-chronic-methamphetamine
#1
Michael F Salvatore, Vicki A Nejtek, Habibeh Khoshbouei
Methamphetamine (MA) exposure may increase the risk of motor or cognitive impairments similar to Parkinson's disease (PD) by middle age. Although damage to nigrostriatal or mesoaccumbens dopamine (DA) neurons may occur during or early after MA exposure, overt PD-like symptoms at a younger age may not manifest due to compensatory mechanisms to maintain DA neurotransmission. One possible compensatory mechanism is increased tyrosine hydroxylase (TH) phosphorylation. In the rodent PD 6-OHDA model, nigrostriatal lesion decreases TH protein in both striatum and substantia nigra (SN)...
May 18, 2018: Neurotoxicology
https://www.readbyqxmd.com/read/29766510/ineffectiveness-of-saxagliptin-as-a-neuroprotective-drug-in-6-ohda-lesioned-rats
#2
Joelle de Melo Turnes, Taysa Bervian Bassani, Leonardo C Souza, Maria A B F Vital
OBJECTIVES: To determine whether the drug saxagliptin, a dipeptidyl peptidase-4 (DPP-4) inhibitor which is utilized for the treatment of Diabetes Mellitus, has neuroprotective effects in the animal model of Parkinson's disease (PD) induced by 6-hydroxydopamine (6-OHDA) in rats. METHODS: Male Wistar rats (weighing 280-300 g) received a bilateral infusion of 6-OHDA in the substantia nigra. Twenty-four hours later, they were treated with saxagliptin (1 mg/kg, p.o) once daily, for 21 days...
May 16, 2018: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/29738870/comparison-of-transitional-vs-surgical-menopause-on-monoamine-and-amino-acid-levels-in-the-rat-brain
#3
Tao Long, Jeffrey K Yao, Junyi Li, Ziv Z Kirshner, Doug Nelson, George G Dougherty, Robert B Gibbs
Loss of ovarian function has important effects on neurotransmitter production and release with corresponding effects on cognitive performance. To date, there has been little direct comparison of the effects of surgical and transitional menopause on neurotransmitter pathways in the brain. In this study, effects on monoamines, monoamine metabolites, and the amino acids tryptophan (TRP) and tyrosine (TYR) were evaluated in adult ovariectomized (OVX) rats and in rats that underwent selective and gradual ovarian follicle depletion by daily injection of 4-vinylcyclohexene-diepoxide (VCD)...
May 5, 2018: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29728920/l-3-n-butylphthalide-regulates-proliferation-migration-and-differentiation-of-neural-stem-cell-in-vitro-and-promotes-neurogenesis-in-app-ps1-mouse-model-by-regulating-bdnf-trkb-creb-akt-pathway
#4
Hui Lei, Yu Zhang, Longjian Huang, Shaofeng Xu, Jiang Li, Lichao Yang, Ling Wang, Changhong Xing, Xiaoliang Wang, Ying Peng
Alzheimer's disease (AD) is characterized by extracellular accumulation of β-amyloid peptides (Aβ) and intracellular neurofibrillary tangles, along with cognitive decline and neurodegeneration. The cognitive deficit is considered to be due to the dysfunction of hippocampal neurogenesis. Although L-3-n-butylphthalide (L-NBP) has been shown beneficial effects in multiple AD animal models, the underlying molecular mechanisms are still elusive. In this study, we investigated the effects of L-NBP on neurogenesis both in vitro and in vivo...
May 4, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29699444/lithium-improves-dopamine-neurotransmission-and-increases-dopaminergic-protein-abundance-in-the-striatum-after-traumatic-brain-injury
#5
Shaun W Carlson, C Edward Dixon
Experimental models of traumatic brain injury (TBI) recapitulate secondary injury sequela and cognitive dysfunction reported in patients afflicted with a TBI. Impairments in neurotransmission are reported in multiple brain regions in the weeks following experimental TBI, and may contribute to behavioral dysfunction. Formation of the soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex is an important mechanism for neurotransmitter exocytosis. We previously showed lithium treatment attenuated hippocampal decreases in α-synuclein and VAMP2, enhanced SNARE complex formation, and improved cognitive performance after TBI...
April 27, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29696690/mesencephalic-dopamine-neurons-interfacing-the-shell-of-nucleus-accumbens-and-the-dorsolateral-striatum-in-the-rat
#6
Floris G Wouterlood, Angela Engel, Mariah Daal, Gertjan Houwen, Aileen Meinderts, Tomàs Jordà Siquier, Jeroen A M Beliën, Yvette C van Dongen, Jørgen Scheel-Krüger, Anne-Marie Thierry, Henk J Groenewegen, Jean-Michel Deniau
Parallel corticostriatonigral circuits have been proposed that separately process motor, cognitive, and emotional-motivational information. Functional integration requires that interactions exist between neurons participating in these circuits. This makes it imperative to study the complex anatomical substrate underlying corticostriatonigral circuits. It has previously been proposed that dopaminergic neurons in the ventral mesencephalon may play a role in this circuit interaction. Therefore, we studied in rats convergence of basal ganglia circuits by depositing an anterograde neuroanatomical tracer into the ventral striatum together with a retrograde fluorescent tracer ipsilaterally in the dorsolateral striatum...
April 25, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29690521/the-gaba-a-receptor-%C3%AE-2-subunit-activates-a-neuronal-tlr4-signal-in-the-ventral-tegmental-area-that-regulates-alcohol-and-nicotine-abuse
#7
Irina Balan, Kaitlin T Warnock, Adam Puche, Marjorie C Gondre-Lewis, Harry June, Laure Aurelian
Alcoholism initiates with episodes of excessive alcohol drinking, known as binge drinking, which is one form of excessive drinking (NIAAA Newsletter, 2004) that is related to impulsivity and anxiety (Ducci et al., 2007; Edenberg et al., 2004) and is also predictive of smoking status. The predisposition of non-alcohol exposed subjects to initiate binge drinking is controlled by neuroimmune signaling that includes an innately activated neuronal Toll-like receptor 4 (TLR4) signal. This signal also regulates cognitive impulsivity, a heritable trait that defines drug abuse initiation...
April 21, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29686016/neurofilament-as-neuronal-injury-blood-marker-in-preeclampsia
#8
Katrina Suzanne Evers, Andrew Atkinson, Christian Barro, Urs Fisch, Marc Pfister, Evelyn A Huhn, Olav Lapaire, Jens Kuhle, Sven Wellmann
Preeclampsia has been shown to be associated with changes in cerebral structure and cognitive function later in life. Nf (neurofilaments) are specific scaffolding proteins of neurons, and their quantification in serum has been proposed as a biomarker for neuroaxonal injury. We performed a prospective, longitudinal, single-center study at the University Hospital of Basel to determine serum Nf concentrations in pregnant women with singleton pregnancies and with high risk of preeclampsia or with early signs of preeclampsia...
April 23, 2018: Hypertension
https://www.readbyqxmd.com/read/29674181/high-glucose-forces-a-positive-feedback-loop-connecting-erbb4-expression-and-mtor-s6k-pathway-to-aggravate-the-formation-of-tau-hyperphosphorylation-in-differentiated-sh-sy5y-cells
#9
Sheng-Dan Nie, Xin Li, Can-E Tang, Fang-Yuan Min, Xia-Jie Shi, Liang-Yan Wu, Shan-Lei Zhou, Zi Chen, Jing Wu, Tao Song, Zhi-Jie Dai, Jiao Zheng, Jia-Jia Liu, Shan Wang
High glucose (HG)-induced mammalian target of rapamycin (mTOR) overactivation acts as a signaling hub for the formation of tau hyperphosphorylation, which contributes to the development of diabetes-associated cognitive deficit. How HG induces the sustained activation of mTOR in neurons is not clearly understood. ErbB4, a member of the receptor tyrosine kinase family, plays critical roles in development and function of neural circuitry, relevant to behavioral deficits. Here, we showed HG-induced ErbB4 overexpression in differentiated SH-SY5Y cells and primary hippocampal neurons and hippocampal pyramidal neurons of streptozotocin-induced diabetic rats...
March 23, 2018: Neurobiology of Aging
https://www.readbyqxmd.com/read/29664737/insulin-regulates-astrocyte-gliotransmission-and-modulates-behavior
#10
Weikang Cai, Chang Xue, Masaji Sakaguchi, Masahiro Konishi, Alireza Shirazian, Heather A Ferris, Mengyao Li, Ruichao Yu, Andre Kleinridders, Emmanuel N Pothos, C Ronald Kahn
Complications of diabetes affect tissues throughout body, including central nervous system. Epidemiological studies show that diabetic patients have increased risk of depression, anxiety, age-related cognitive decline and Alzheimer's disease. Mice lacking insulin receptor in brain or on hypothalamic neurons display an array of metabolic abnormalities, however, the role of insulin action on astrocytes and neurobehaviors remains less well-studied. Here, we demonstrate that astrocytes are a direct insulin target in the brain and that knockout of IR on astrocytes causes increased anxiety and depressive-like behaviors in mice...
April 17, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29621970/the-interplay-of-bdnf-trkb-with-nmda-receptor-in-propofol-induced-cognition-dysfunction-mechanism-for-the-effects-of-propofol-on-cognitive-function
#11
Junfei Zhou, Fang Wang, Jun Zhang, Jianfeng Li, Li Ma, Tieli Dong, Zhigang Zhuang
BACKGROUND: The aim of the present study was to verify whether propofol impaired learning and memory through the interplay of N-methyl-D-aspartate (NMDA) receptor with brain-derived neurotrophic factor (BDNF)-tyrosine kinase B (TrkB) signaling pathway. METHODS: 120 Sprague-Dawley (SD) rats were randomly assigned into eight groups. Experimental drugs including saline, intralipid, propofol, N-methyl-D-aspartate (NMDA), 7,8-dihydroxyflavone (7,8-DHF), K252a and MK-801...
April 5, 2018: BMC Anesthesiology
https://www.readbyqxmd.com/read/29576474/the-tyrosine-phosphatase-step-is-involved-in-age-related-memory-decline
#12
David Castonguay, Julien Dufort-Gervais, Caroline Ménard, Manavi Chatterjee, Rémi Quirion, Bruno Bontempi, Jay S Schneider, Amy F T Arnsten, Angus C Nairn, Christopher M Norris, Guylaine Ferland, Erwan Bézard, Pierrette Gaudreau, Paul J Lombroso, Jonathan Brouillette
Cognitive disabilities that occur with age represent a growing and expensive health problem. Age-associated memory deficits are observed across many species, but the underlying molecular mechanisms remain to be fully identified. Here, we report elevations in the levels and activity of the striatal-enriched phosphatase (STEP) in the hippocampus of aged memory-impaired mice and rats, in aged rhesus monkeys, and in people diagnosed with amnestic mild cognitive impairment (aMCI). The accumulation of STEP with aging is related to dysfunction of the ubiquitin-proteasome system that normally leads to the degradation of STEP...
March 21, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29560440/chronic-voluntary-oral-methamphetamine-induces-deficits-in-spatial-learning-and-hippocampal-protein-kinase-mzeta-with-enhanced-astrogliosis-and-cyclooxygenase-2-levels
#13
Jorge A Avila, Roseanna M Zanca, Denis Shor, Nicholas Paleologos, Amber A Alliger, Maria E Figueiredo-Pereira, Peter A Serrano
Methamphetamine (MA) is an addictive drug with neurotoxic effects on the brain producing cognitive impairment and increasing the risk for neurodegenerative disease. Research has focused largely on examining the neurochemical and behavioral deficits induced by injecting relatively high doses of MA [30 mg/kg of body weight (bw)] identifying the upper limits of MA-induced neurotoxicity. Accordingly, we have developed an appetitive mouse model of voluntary oral MA administration (VOMA) based on the consumption of a palatable sweetened oatmeal mash containing a known amount of MA...
February 2018: Heliyon
https://www.readbyqxmd.com/read/29491219/skf83959-has-protective-effects-in-the-scopolamine-model-of-dementia
#14
Gaofeng Sheng, Jinlin Zhang, Shengfeng Gao, Yuanyuan Gu, Bo Jiang, Qiufang Gao
Patients with Alzheimer's disease (AD) always have cognitive impairments. In this study we investigated whether 6-chloro-7,8-dihydroxy-3-methyl-1-(3-methylphenyl)-2,3,4,5-tetrahydro-1H-3-benzazepine (SKF83959) has improvements on cognitive dysfunction. The scopolamine model of dementia was used to investigate the anti-amnesic activities of SKF83959, and then, Western blotting and pharmacological inhibitor were used to assay the anti-amnesic mechanisms of SKF83959. It was found that SKF83959 administration significantly improved the scopolamine-induced memory impairments in the passive avoidance task, Y-maze test, and Morris water maze task...
2018: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29481896/zinc-as-a-therapy-in-a-rat-model-of-autism-prenatally-induced-by-valproic-acid
#15
Luana Carvalho Cezar, Thiago Berti Kirsten, Caio Cesar Navarrete da Fonseca, Ana Paula Nascimento de Lima, Maria Martha Bernardi, Luciano Freitas Felicio
Autism is characterized by numerous behavioral impairments, such as in communication, socialization and cognition. Recent studies have suggested that valproic acid (VPA), an anti-epileptic drug with teratogenic activity, is related to autism. In rodents, VPA exposure during pregnancy induces autistic-like effects. Exposure to VPA may alter zinc metabolism resulting in a transient deficiency of zinc. Therefore, we selected zinc as a prenatal treatment to prevent VPA-induced impairments in a rat model of autism...
June 8, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29463009/docosahexaenoic-acid-helps-to-lessen-extinction-memory-in-rats
#16
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/29445765/-in-vivo-observation-of-structural-changes-in-neocortical-catecholaminergic-projections-in-response-to-drugs-of-abuse
#17
Mai M Morimoto, Shinji Tanaka, Shunsuke Mizutani, Shinji Urata, Kazuto Kobayashi, Shigeo Okabe
Catecholaminergic (dopamine and norepinephrine) projections to the cortex play an important role in cognitive functions and dysfunctions including learning, addiction, and mental disorders. While dynamics of glutamatergic synapses have been well studied in such contexts, little is known regarding catecholaminergic projections, owing to lack of robust methods. Here we report a system to monitor catecholaminergic projections in vivo over the timeframes that such events occur. Green fluorescent protein (GFP) expression driven by tyrosine hydroxylase promoter in a transgenic mouse line enabled us to perform two-photon imaging of cortical catecholaminergic projections through a cranial window...
January 2018: ENeuro
https://www.readbyqxmd.com/read/29427771/neuregulin-1-erbb-signalling-modulates-hippocampal-mgluri-dependent-ltd-and-object-recognition-memory
#18
Ada Ledonne, Dalila Mango, Emanuele Claudio Latagliata, Giulia Chiacchierini, Annalisa Nobili, Robert Nisticò, Marcello D'Amelio, Stefano Puglisi-Allegra, Nicola Biagio Mercuri
The neurotrophic factors neuregulins (NRGs) and their receptors, ErbB tyrosine kinases, regulate neurotransmission, synaptic plasticity and cognitive functions and their alterations have been associated to different neuropsychiatric disorders. Group 1 metabotropic glutamate receptors (mGluRI)-dependent mechanisms are also altered in animal models of neuropsychiatric diseases, especially mGluRI-induced glutamatergic long-term depression (mGluRI-LTD), a form of synaptic plasticity critically involved in learning and memory...
April 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29421605/impaired-insulin-signaling-and-spatial-learning-in-middle-aged-rats-the-role-of-ptp1b
#19
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...
April 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29419747/voluntary-physical-exercise-improves-subsequent-motor-and-cognitive-impairments-in-a-rat-model-of-parkinson-s-disease
#20
Shih-Chang Hsueh, Kai-Yun Chen, Jing-Huei Lai, Chung-Che Wu, Yu-Wen Yu, Yu Luo, Tsung-Hsun Hsieh, Yung-Hsiao Chiang
BACKGROUND: Parkinson's disease (PD) is typically characterized by impairment of motor function. Gait disturbances similar to those observed in patients with PD can be observed in animals after injection of neurotoxin 6-hydroxydopamine (6-OHDA) to induce unilateral nigrostriatal dopamine depletion. Exercise has been shown to be a promising non-pharmacological approach to reduce the risk of neurodegenerative disease. METHODS: In this study, we investigated the long-term effects of voluntary running wheel exercise on gait phenotypes, depression, cognitive, rotational behaviors as well as histology in a 6-OHDA-lesioned rat model of PD...
February 8, 2018: International Journal of Molecular Sciences
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