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Treadmill dopamine

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https://www.readbyqxmd.com/read/28373651/fatigue-modulates-dopamine-availability-and-promotes-flexible-choice-reversals-during-decision-making
#1
Pierpaolo Iodice, Claudio Ferrante, Luigi Brunetti, Simona Cabib, Feliciano Protasi, Mark E Walton, Giovanni Pezzulo
During decisions, animals balance goal achievement and effort management. Despite physical exercise and fatigue significantly affecting the levels of effort that an animal exerts to obtain a reward, their role in effort-based choice and the underlying neurochemistry are incompletely known. In particular, it is unclear whether fatigue influences decision (cost-benefit) strategies flexibly or only post-decision action execution and learning. To answer this question, we trained mice on a T-maze task in which they chose between a high-cost, high-reward arm (HR), which included a barrier, and a low-cost, low-reward arm (LR), with no barrier...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28243821/the-impact-of-short-and-long-term-exercise-on-the-expression-of-arc-and-ampars-during-evolution-of-the-6-hydroxy-dopamine-animal-model-of-parkinson-s-disease
#2
P C Garcia, C C Real, L R Britto
The loss of nigral dopaminergic neurons typical in Parkinson's disease (PD) is responsible for hyperexcitability of medium spiny neurons resulting in abnormal corticostriatal glutamatergic synaptic drive. Considering the neuroprotective effect of exercise, the changes promoted by exercise on AMPA-type glutamate receptors (AMPARs), and the role of activity-regulated cytoskeleton-associated protein (Arc) in the AMPARs trafficking, we studied the impact of short and long-term treadmill exercise during evolution of the unilateral 6-hydroxy-dopamine (6-OHDA) animal model of PD...
April 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28239983/targeted-deletion-of-gd3-synthase-protects-against-mptp-induced-neurodegeneration
#3
Y Akkhawattanangkul, P Maiti, Y Xue, D Aryal, W C Wetsel, D Hamilton, S C Fowler, M P McDonald
Parkinson's disease is a debilitating neurodegenerative condition for which there is no cure. Converging evidence implicates gangliosides in the pathogenesis of several neurodegenerative diseases, suggesting a potential new class of therapeutic targets. We have shown that interventions that simultaneously increase the neuroprotective GM1 ganglioside and decrease the pro-apoptotic GD3 ganglioside - such as inhibition of GD3 synthase (GD3S) or administration of sialidase - are neuroprotective in vitro and in a number of preclinical models...
February 27, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/28130186/moderate-intensity-treadmill-exercise-alters-food-preference-via-dopaminergic-plasticity-of-ventral-tegmental-area-nucleus-accumbens-in-obese-mice
#4
Wei Chen, Hai Jun Wang, Ning Ning Shang, Jun Liu, Juan Li, Dong Hui Tang, Qiong Li
Obesity has been associated with the excessive intake of palatable food as well as physical inactivity. To investigate the neurobiological mechanism underlying the exercised-induced prevention and treatment of obesity, the present study examined the effect of treadmill exercise on the preference for palatable food in mice. Levels of tyrosine hydroxylase (TH) in the ventral tegmental area-nucleus accumbens system were also analysed, as well as levels of dopamine, dopamine transporter, and D2 receptors in the nucleus accumbens...
January 24, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28122057/possible-signaling-pathways-mediating-neuronal-calcium-sensor-1-dependent-spatial-learning-and-memory-in-mice
#5
Tomoe Y Nakamura, Shu Nakao, Yukako Nakajo, Jun C Takahashi, Shigeo Wakabayashi, Hiroji Yanamoto
Intracellular Ca2+ signaling regulates diverse functions of the nervous system. Many of these neuronal functions, including learning and memory, are regulated by neuronal calcium sensor-1 (NCS-1). However, the pathways by which NCS-1 regulates these functions remain poorly understood. Consistent with the findings of previous reports, we revealed that NCS-1 deficient (Ncs1-/-) mice exhibit impaired spatial learning and memory function in the Morris water maze test, although there was little change in their exercise activity, as determined via treadmill-analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28062370/treadmill-exercise-alleviates-motor-deficits-and-improves-mitochondrial-import-machinery-in-an-mptp-induced-mouse-model-of-parkinson-s-disease
#6
Jung-Hoon Koo, Joon-Yong Cho, Ung-Bae Lee
Alpha-synuclein (α-Syn) accumulation is significantly correlated with motor deficits and mitochondrial dysfunction in Parkinson's disease (PD), but the molecular mechanism underlying its pathogenesis is unclear. In this study, we investigated the effects of treadmill exercise on motor deficits and mitochondrial dysfunction in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of PD. Treadmill exercise inhibited dopaminergic neuron loss by promoting the expression of tyrosine hydroxylase (TH) and dopamine transporter (DAT) and seemed to improve cell survival by reducing α-Syn expression...
January 4, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/27909152/involvement-of-mesolimbic-dopaminergic-network-in-neuropathic-pain-relief-by-treadmill-exercise-a-study-for-specific-neural-control-with-gi-dreadd-in-mice
#7
Kenta Wakaizumi, Takashige Kondo, Yusuke Hamada, Michiko Narita, Rui Kawabe, Hiroki Narita, Moe Watanabe, Shigeki Kato, Emiko Senba, Kazuto Kobayashi, Naoko Kuzumaki, Akihiro Yamanaka, Hiroshi Morisaki, Minoru Narita
BACKGROUND: Exercise alleviates pain and it is a central component of treatment strategy for chronic pain in clinical setting. However, little is known about mechanism of this exercise-induced hypoalgesia. The mesolimbic dopaminergic network plays a role in positive emotions to rewards including motivation and pleasure. Pain negatively modulates these emotions, but appropriate exercise is considered to activate the dopaminergic network. We investigated possible involvement of this network as a mechanism of exercise-induced hypoalgesia...
2016: Molecular Pain
https://www.readbyqxmd.com/read/27111919/effects-of-treadmill-exercise-on-spontaneous-firing-activities-of-striatal-neurons-in-a-rat-model-of-parkinson-s-disease
#8
Kaixuan Shi, Xiaoli Liu, Decai Qiao, Lijuan Hou
Exercise improves motor deficits in Parkinson's disease (PD) patients but the underlying neuronal mechanism is poorly understood. Since the striatum is critical to motor function, we have investigated the potential effects of exercise on the spiking activity of the striatal neurons in a rat model of Parkinson's disease. Twenty-four hours after injection of 6-hydroxydopamine (6-OHDA) into the right medial forebrain bundle, rats in exercise groups were trained to exercise on a treadmill. Twenty-eight days after 6-OHDA lesion, apomorphine induced fewer rotations in the PD rats with exercise than in PD + Ex rats...
January 2017: Motor Control
https://www.readbyqxmd.com/read/27076419/ventral-medial-thalamic-nucleus-promotes-synchronization-of-increased-high-beta-oscillatory-activity-in-the-basal-ganglia-thalamocortical-network-of-the-hemiparkinsonian-rat
#9
Elena Brazhnik, Alex J McCoy, Nikolay Novikov, Christina E Hatch, Judith R Walters
UNLABELLED: Loss of dopamine is associated with increased synchronization and oscillatory activity in the subthalamic nucleus and basal ganglia (BG) output nuclei in both Parkinson's disease (PD) patients and animal models of PD. We have previously observed substantial increases in spectral power in the 25-40 Hz range in LFPs recorded in the substantia nigra pars reticulata (SNpr) and motor cortex (MCx) in the hemiparkinsonian rat during treadmill walking. The current study explores the hypothesis that SNpr output entrains activity in the ventral medial thalamus (VM) in this frequency range after loss of dopamine, which in turn contributes to entrainment of the MCx and BG...
April 13, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27036890/depletion-of-nucleus-accumbens-dopamine-leads-to-impaired-reward-and-aversion-processing-in-mice-relevance-to-motivation-pathologies
#10
Giorgio Bergamini, Hannes Sigrist, Boris Ferger, Nicolas Singewald, Erich Seifritz, Christopher R Pryce
Dopamine (DA) neurotransmission, particularly the ventral tegmental area-nucleus accumbens (VTA-NAcc) projection, underlies reward and aversion processing, and deficient DA function could underlie motivational impairments in psychiatric disorders. 6-hydroxydopamine (6-OHDA) injection is an established method for chronic DA depletion, principally applied in rat to study NAcc DA regulation of reward motivation. Given the increasing focus on studying environmental and genetic regulation of DA function in mouse models, it is important to establish the effects of 6-OHDA DA depletion in mice, in terms of reward and aversion processing...
October 2016: Neuropharmacology
https://www.readbyqxmd.com/read/26787858/gene-therapy-blockade-of-dorsal-striatal-p11-improves-motor-function-and-dyskinesia-in-parkinsonian-mice
#11
Roberta Marongiu, Margarita Arango-Lievano, Veronica Francardo, Peter Morgenstern, Xiaoqun Zhang, M Angela Cenci, Per Svenningsson, Paul Greengard, Michael G Kaplitt
Complications of dopamine replacement for Parkinson's disease (PD) can limit therapeutic options, leading to interest in identifying novel pathways that can be exploited to improve treatment. p11 (S100A10) is a cellular scaffold protein that binds to and potentiates the activity of various ion channels and neurotransmitter receptors. We have previously reported that p11 can influence ventral striatal function in models of depression and drug addiction, and thus we hypothesized that dorsal striatal p11 might mediate motor function and drug responses in parkinsonian mice...
February 2, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/26717409/hormonal-neuroendocrine-and-vasoconstrictor-peptide-responses-of-ball-game-and-cyclic-sport-elite-athletes-by-treadmill-test
#12
Anna Protzner, Márta Szmodis, Anna Udvardy, Edit Bosnyák, Emese Trájer, Zsolt Komka, István Györe, Miklós Tóth
OBJECTIVE: Our objective was to evaluate complex hormonal response in ball game and cyclic sport elite athletes through an incremental treadmill test, since, so far, variables in experimental procedures have often hampered comparisons of data. METHODS: We determined anthropometric data, heart rate, maximal oxygen uptake, workload, plasma levels of lactate, adrenaline, noradrenaline, dopamine, cortisol, angiontensinogen and endothelin in control (n = 6), soccer (n = 8), handball (n = 12), kayaking (n = 9) and triathlon (n = 9) groups based on a Bruce protocol through a maximal exercise type of spiroergometric test...
2015: PloS One
https://www.readbyqxmd.com/read/26650246/sleep-related-movement-disorder-symptoms-in-shr-are-attenuated-by-physical-exercise-and-an-angiotensin-converting-enzyme-inhibitor
#13
Miriam Kannebley Frank, Marco Tulio de Mello, Kil Sun Lee, Paulo Daubian-Nosé, Sergio Tufik, Andrea Maculano Esteves
The relationship between hypertension and sleep-related movement disorders has been hypothesized for humans, but the causes and mechanisms have not been elucidated. We investigated whether an alteration in blood pressure (BP) induced by physical exercise and/or an angiotensin-converting enzyme inhibitor (enalapril) could affect locomotor activity in spontaneously hypertensive rats, with emphasis on the dopaminergic system. We used SHR and normotensive Wistar rats distributed into 4 groups for each strain: control, physical exercise, enalapril and physical exercise+enalapril...
February 1, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/26604076/administration-of-caffeine-inhibited-adenosine-receptor-agonist-induced-decreases-in-motor-performance-thermoregulation-and-brain-neurotransmitter-release-in-exercising-rats
#14
Xinyan Zheng, Hiroshi Hasegawa
We examined the effects of an adenosine receptor agonist on caffeine-induced changes in thermoregulation, neurotransmitter release in the preoptic area and anterior hypothalamus, and endurance exercise performance in rats. One hour before the start of exercise, rats were intraperitoneally injected with either saline alone (SAL), 10 mg kg(-1) caffeine and saline (CAF), a non-selective adenosine receptor agonist (5'-N-ethylcarboxamidoadenosine [NECA]: 0.5 mg kg(-1)) and saline (NECA), or the combination of caffeine and NECA (CAF+NECA)...
January 2016: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/26599339/exercise-mediated-increase-in-nigral-tyrosine-hydroxylase-is-accompanied-by-increased-nigral-gfr-%C3%AE-1-and-eaac1-expression-in-aging-rats
#15
Jennifer C Arnold, Michael F Salvatore
Exercise may alleviate locomotor impairment in Parkinson's disease (PD) or aging. Identifying molecular responses immediately engaged by exercise in the nigrostriatal pathway and allied tissue may reveal critical targets associated with its long-term benefits. In aging, there is loss of tyrosine hydroxylase (TH) and the glial cell line-derived neurotrophic factor (GDNF) receptor, GFR-α1, in the substantia nigra (SN). Exercise can increase GDNF expression, but its effect on GFR-α1 expression is unknown. Infusion of GDNF into striatum or GFR-α1 in SN, respectively, can increase locomotor activity and TH function in SN but not striatum in aged rats...
February 17, 2016: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/26464310/exercise-improves-cognitive-impairment-and-dopamine-metabolism-in-mptp-treated-mice
#16
Aderbal S Aguiar, Samantha C Lopes, Fabrine S M Tristão, Daniel Rial, Gisele de Oliveira, Cláudio da Cunha, Rita Raisman-Vozari, Rui D Prediger
The classical motor symptoms of Parkinson’s disease (PD) are preceded by non-motor symptoms in preclinical stages, including cognition impairment. The current drug treatment for PD is palliative and does not meet the clinical challenges of the disease, such as levodopa-induced dyskinesia, non-motor symptoms, and neuroprotection. We investigated the neuroprotective and disease-modifying potential of physical exercise in a preclinical animal model of PD. C57BL/6 mice (adult males) ran on a horizontal treadmill for 6 weeks (moderate intensity, 5 times/week) and were treated intranasally with 65 mg/kg of the neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)...
January 2016: Neurotoxicity Research
https://www.readbyqxmd.com/read/25926466/subthalamic-nucleus-activity-in-the-awake-hemiparkinsonian-rat-relationships-with-motor-and-cognitive-networks
#17
Claire Delaville, Alex J McCoy, Colin M Gerber, Ana V Cruz, Judith R Walters
Oscillatory activity in both beta and gamma ranges has been recorded in the subthalamic nucleus (STN) of Parkinson's disease (PD) patients and linked to motor function, with beta activity considered antikinetic, and gamma activity, prokinetic. However, the extent to which nonmotor networks contribute to this activity is unclear. This study uses hemiparkinsonian rats performing a treadmill walking task to compare synchronized STN local field potential (LFP) activity with activity in motor cortex (MCx) and medial prefrontal cortex (mPFC), areas involved in motor and cognitive processes, respectively...
April 29, 2015: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/25667820/oscillatory-activity-in-basal-ganglia-and-motor-cortex-in-an-awake-behaving-rodent-model-of-parkinson-s-disease
#18
Claire Delaville, Ana V Cruz, Alex J McCoy, Elena Brazhnik, Irene Avila, Nikolay Novikov, Judith R Walters
Exaggerated beta range (15-30 Hz) oscillatory activity is observed in the basal ganglia of Parkinson's disease (PD) patients during implantation of deep brain stimulation electrodes. This activity has been hypothesized to contribute to motor dysfunction in PD patients. However, it remains unclear how these oscillations develop and how motor circuits become entrained into a state of increased synchronization in this frequency range after loss of dopamine. It is also unclear whether this increase in neuronal synchronization actually plays a significant role in inducing the motor symptoms of this disorder...
April 1, 2014: Basal Ganglia
https://www.readbyqxmd.com/read/25426460/effect-of-treadmill-exercise-on-social-interaction-and-tyrosine-hydroxylase-expression-in-the-attention-deficit-hyperactivity-disorder-rats
#19
Dae-Jung Baek, Chae-Bin Lee, Seung-Soo Baek
Attention-deficit/hyperactivity disorder (ADHD) involves clinically heterogeneous dysfunctions of sustained attention, with behavioral hyper-activity and impulsivity. The exact underlying mechanisms of ADHD are not known, however, impairment of dopaminergic system in the nigrostriatal pathway was suggested as the one of the possible mechanisms of ADHD. Tyrosine hydroxylase (TH) is the rate-limiting enzyme that is involved in the synthesis of dopamine. Spontaneous hypertensive rats have been used as the animal model for ADHD...
October 2014: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/25286336/treadmill-exercise-activates-nrf2-antioxidant-system-to-protect-the-nigrostriatal-dopaminergic-neurons-from-mpp-toxicity
#20
Yi-Hsien Tsou, Ching-Ting Shih, Cheng-Hsin Ching, Jui-Yen Huang, Chauying J Jen, Lung Yu, Yu-Min Kuo, Fong-Sen Wu, Jih-Ing Chuang
Exercise induces oxidative stress, which may activate adaptive antioxidant responses. Nuclear factor erythroid 2-related factor 2 (Nrf2) plays an important role in the defense of oxidative stress by regulating the expression of antioxidant enzymes, gamma-glutamylcysteine ligase (γGCL) and heme oxygenase-1 (HO-1). We investigated whether treadmill exercise protects dopaminergic neurons by regulating the Nrf2 antioxidant system in a 1-methyl-4-phenylpyridine (MPP(+))-induced parkinsonian rat model. We found that MPP(+) induced early decreases in total glutathione level and Nrf2/γGCLC (catalytic subunit of γGCL) expression, but late upregulation of HO-1 expression in association with loss of nigral dopaminergic neurons and downregulation of tyrosine hydroxylase and dopamine transporter expression in the striatum...
January 2015: Experimental Neurology
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