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Basal ganglia

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https://www.readbyqxmd.com/read/29332074/diffusion-tensor-imaging-of-the-basal-ganglia-for-functional-neurosurgery-applications
#1
Francesco Sammartino, Mojgan Hodaie
Since its introduction, diffusion tensor imaging (DTI) has become an important tool in neuroscience given its unprecedented ability to image brain white matter in vivo. The interest in understanding the mechanisms of action of Deep Brain Stimulation in different targets and indications, together with the constant drive towards the improvement in long-term clinical outcomes, has found a logical complement in the application of tractography in this field. Diffusion tensor imaging has been traditionally associated with an increased susceptibility to MRI artifacts, and expensive computational resources...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29332073/functional-anatomy-of-basal-ganglia-circuits-with-the-cerebral-cortex-and-the-cerebellum
#2
Andreea C Bostan, Richard P Dum, Peter L Strick
The neural connections of the basal ganglia provide important insights into their function. Here, we discuss the current perspective on basal ganglia connections with the cerebral cortex and with the cerebellum. We review the evidence that the basal ganglia participate in functionally segregated circuits with motor and non-motor areas of the cerebral cortex. We then discuss the data that the basal ganglia are interconnected with the cerebellum. These results provide the anatomical substrate for basal ganglia contributions not only to the control of movement, but also to a variety of cognitive and affective functions...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29332070/pathophysiologic-basis-of-movement-disorders
#3
Thomas Wichmann
Movement disorders are common and functionally disabling neurologic diseases. Studies over the last decades have investigated the pathophysiology of these diseases in considerable detail, leading to significant insights into their generation of motor disability. While genetically and clinically heterogeneous, most of them are accompanied by prominent and characteristic changes in firing rates and patterns in the basal ganglia, thalamus, and cortex. In recent years, researchers have placed increasing emphasis on the importance of oscillatory changes in firing in these structures, and have discovered that brain areas that were previously considered to be remote from the basal ganglia (such as the cerebellum and the pedunculopontine nucleus) are also highly significant in these disorders...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29330326/loss-of-balance-between-striatal-feedforward-inhibition-and-corticostriatal-excitation-leads-to-tremor
#4
Yael Oran, Izhar Bar-Gad
Fast spiking interneurons (FSIs) exert powerful inhibitory control over the striatum and are hypothesized to balance the massive excitatory cortical and thalamic input to this structure. We recorded neuronal activity in the dorsolateral striatum and globus pallidus (GP) concurrently with the detailed movement kinematics of freely behaving female rats prior to and following selective inhibition of FSI activity using IEM-1460 microinjections. The inhibition led to the appearance of episodic rest tremor in the body part that depended on the somatotopic location of the injection within the striatum...
January 12, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29326137/expression-changes-in-lactate-and-glucose-metabolism-and-associated-transporters-in-basal-ganglia-following-hypoxic-ischemic-reperfusion-injury-in-piglets
#5
Y Zheng, X-M Wang
BACKGROUND AND PURPOSE: The neonatal brain has active energy metabolism, and glucose oxidation is the major energy source of brain tissue. Lactate is produced by astrocytes and released to neurons. In the central nervous system, lactate is transported between neurons and astrocytes via the astrocyte-neuron lactate shuttle. The aim of this study was to investigate the regulatory mechanisms of energy metabolism in neurons and astrocytes in the basal ganglia of a neonatal hypoxic-ischemic brain injury piglet model...
January 11, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29325620/primary-familial-brain-calcifications
#6
Beatriz Quintáns, Joao Oliveira, María-Jesús Sobrido
Primary familial brain calcification (PFBC) is a neurodegenerative disease with characteristic calcium deposits in the basal ganglia and other brain regions. The disease usually presents as a combination of abnormal movements, cognitive and psychiatric manifestations, clinically indistinguishable from other adult-onset neurodegenerative disorders. The differential diagnosis must be established with genetic and nongenetic disorders that can also lead to calcium deposits in encephalic structures. In the past years PFBC causal mutations have been discovered in genes related to calcium phosphate homeostasis (SLC20A2, XPR1) and in genes involved with endothelial function and integrity (PDGFB, PDGFRB)...
2018: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/29325618/neurodegeneration-with-brain-iron-accumulation
#7
Susan J Hayflick, Manju A Kurian, Penelope Hogarth
Neurodegeneration with brain iron accumulation (NBIA) comprises a clinically and genetically heterogeneous group of disorders affecting children and adults. These rare disorders are often first suspected when increased basal ganglia iron is observed on brain magnetic resonance imaging. For the majority of NBIA disorders the genetic basis has been delineated, and clinical testing is available. The four most common NBIA disorders include pantothenate kinase-associated neurodegeneration (PKAN) due to mutations in PANK2, phospholipase A2-associated neurodegeneration caused by mutation in PLA2G6, mitochondrial membrane protein-associated neurodegeneration from mutations in C19orf12, and beta-propeller protein-associated neurodegeneration due to mutations in WDR45...
2018: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/29324935/right-putamen-and-age-are-the-most-discriminant-features-to-diagnose-parkinson-s-disease-by-using-123i-fp-cit-brain-spet-data-by-using-an-artificial-neural-network-classifier-a-classification-tree-clt
#8
S Cascianelli, C Tranfaglia, M L Fravolini, F Bianconi, M Minestrini, S Nuvoli, N Tambasco, M E Dottorini, B Palumbo
OBJECTIVE: The differential diagnosis of Parkinson's disease (PD) and other conditions, such as essential tremor and drug-induced parkinsonian syndrome or normal aging brain, represents a diagnostic challenge. 123I-FP-CIT brain SPET is able to contribute to the differential diagnosis. Semiquantitative analysis of radiopharmaceutical uptake in basal ganglia (caudate nuclei and putamina) is very useful to support the diagnostic process. An artificial neural network classifier using 123I-FP-CIT brain SPET data, a classification tree (CIT), was applied...
September 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/29323006/spastic-paraparesis-with-basal-ganglia-changes-infantile-neuroaxonal-dystrophy
#9
Ananthanarayanan Kasinathan, Chirag K Ahuja, Pratibha Singhi
No abstract text is available yet for this article.
January 2018: Neurology India
https://www.readbyqxmd.com/read/29321200/bilateral-haemorrhagic-basal-ganglia-infarction-associated-with-early-onset-group-b-streptococcus-meningitis
#10
Rajesh Gupta, Taiwo Maraiyesa, Brendon Conry
A 2-day-old infant presented with poor feeding and grunting. Investigations revealed a raised C reactive protein of 164. Full septic screen was done, which subsequently confirmed a diagnosis of group B streptococcus meningitis. Baby was apyrexial and haemodynamically stable. There were no obvious neurological manifestations, and a routine cranial ultrasound scan was done, which revealed echogenic changes in the basal ganglia and thalami. MRI brain showed extensive haemorrhagic infarction within the lentiform and caudate nuclei with involvement of both posterior limbs of the internal capsule...
January 9, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29318783/tak-063-a-novel-pde10a-inhibitor-with-balanced-activation-of-direct-and-indirect-pathways-provides-a-unique-opportunity-for-the-treatment-of-schizophrenia
#11
REVIEW
Kazunori Suzuki, Haruhide Kimura
The basal ganglia regulates motor, cognitive, and emotional behaviors. Dysfunction of dopamine system in this area is implicated in the pathophysiology of schizophrenia characterized by positive symptoms, negative symptoms, and cognitive deficits. Medium spiny neurons (MSNs) are principal output neurons of striatum in the basal ganglia. Similar to current antipsychotics with dopamine D2 receptor antagonism or partial agonism, phosphodiesterase 10A (PDE10A) inhibitors activate indirect pathway MSNs, leading to the expectation of therapeutic potential for the treatment of psychosis...
January 9, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29317611/metabotropic-glutamate-receptor-5-binding-in-male-patients-with-alcohol-use-disorder
#12
Funda Akkus, Yoan Mihov, Valerie Treyer, Simon M Ametamey, Anass Johayem, Smeralda Senn, Susanne Rösner, Alfred Buck, Gregor Hasler
Glutamate signaling plays a major role in addiction. Preclinical research strongly suggests an implication of G-protein-coupled metabotropic glutamate receptor subtype 5 (mGluR5) in nicotine addiction and alcohol use disorder. In humans, smoking is related to a global reduction in mGluR5 availability. In the present study, we investigated mGluR5 in vivo in patients with alcohol use disorder without the confounding effects of smoking. A total of 14 male subjects with alcohol use disorder and at least a 25-day abstinence and 14 matched male non-smoking healthy controls were included in the study...
January 10, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29317247/development-of-stereotaxic-recording-system-for-awake-marmosets-callithrix-jacchus
#13
Masahiro Wakabayashi, Daisuke Koketsu, Hideki Kondo, Shigeki Sato, Kiichi Ohara, Zlata Polyakova, Satomi Chiken, Nobuhiko Hatanaka, Atsushi Nambu
The common marmoset has been proposed as a potential alternative to macaque monkey as a primate model for neuroscience and medical research. Here, we have newly developed a stereotaxic neuronal recording system for awake marmosets under the head-fixed condition by modifying that for macaque monkeys. Using this system, we recorded neuronal activity in the cerebral cortex of awake marmosets and successfully identified the primary motor cortex by intracortical microstimulation. Neuronal activities of deep brain structures, such as the basal ganglia, thalamus, and cerebellum, in awake marmosets were also successfully recorded referring to magnetic resonance images...
January 6, 2018: Neuroscience Research
https://www.readbyqxmd.com/read/29317049/autoimmunity-against-a-glycolytic-enzyme-as-a-possible-cause-for-persistent-symptoms-in-lyme-disease
#14
Paolo Maccallini, Serena Bonin, Giusto Trevisan
Some patients with a history of Borrelia burgdorferi infection develop a chronic symptomatology characterized by cognitive deficits, fatigue, and pain, despite antibiotic treatment. The pathogenic mechanism that underlines this condition, referred to as post-treatment Lyme disease syndrome (PTLDS), is currently unknown. A debate exists about whether PTLDS is due to persistent infection or to post-infectious damages in the immune system and the nervous system. We present the case of a patient with evidence of exposure to Borrelia burgdorferi sl and a long history of debilitating fatigue, cognitive abnormalities and autonomic nervous system issues...
January 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29316559/enlarged-basal-ganglia-perivascular-spaces-are-associated-with-pulsatile-components-of-blood-pressure
#15
Oscar H Del Brutto, Robertino M Mera
BACKGROUND/AIMS: Pathogenetic mechanisms involved in enlargement of basal ganglia perivascular spaces (BG-PVSs) are controversial. Here, we assessed whether pulsatile or steady components of blood pressure (BP) are associated with enlarged BG-PVS. METHODS: We evaluated the association between BG-PVS and pulsatile and steady components of BP in Atahualpa residents aged ≥60 years, by the use of regression models and receiver operator characteristics (ROC) curve analysis, after taking into account the effect of demographics, cardiovascular risk factors, and other signatures of cerebral small vessel disease (SVD)...
January 9, 2018: European Neurology
https://www.readbyqxmd.com/read/29316490/local-and-long-range-circuit-elements-for-cerebellar-function
#16
REVIEW
Le Xiao, Peter Scheiffele
The view of cerebellar functions has been extended from controlling sensorimotor processes to processing 'contextual' information and generating predictions for a diverse range of behaviors. These functions rely on the computation of the local cerebellar microcircuits and long-range connectivity that relays cerebellar output to various brain areas. In this review, we discuss recent work on two of the circuit elements, which are thought to be fundamental for a wide range of non-sensorimotor behaviors: The role for cerebellar granule cells in multimodal integration in the cerebellar cortex and the long-range connectivity between the deep cerebellar nuclei and the basal ganglia...
January 6, 2018: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29316081/alterations-of-the-cerebellum-and-basal-ganglia-in-bipolar-disorder-mood-states-detected-by-quantitative-t1%C3%AF-mapping
#17
Casey P Johnson, Gary E Christensen, Jess G Fiedorowicz, Merry Mani, Joseph J Shaffer, Vincent A Magnotta, John A Wemmie
OBJECTIVES: Quantitative mapping of T1 relaxation in the rotating frame (T1ρ) is a magnetic resonance imaging technique sensitive to pH and other cellular and microstructural factors, and is a potentially valuable tool for identifying brain alterations in bipolar disorder. Recently, this technique identified differences in the cerebellum and cerebral white matter of euthymic patients vs healthy controls that were consistent with reduced pH in these regions, suggesting an underlying metabolic abnormality...
January 7, 2018: Bipolar Disorders
https://www.readbyqxmd.com/read/29315951/four-way-multimodal-fusion-of-7%C3%A2-t-imaging-data-using-an-mcca-jica-model-in-first-episode-schizophrenia
#18
Kristin K Lottman, David M White, Nina V Kraguljac, Meredith A Reid, Vince D Calhoun, Fabio Catao, Adrienne C Lahti
Acquisition of multimodal brain imaging data for the same subject has become more common leading to a growing interest in determining the intermodal relationships between imaging modalities to further elucidate the pathophysiology of schizophrenia. Multimodal data have previously been individually analyzed and subsequently integrated; however, these analysis techniques lack the ability to examine true modality inter-relationships. The utilization of a multiset canonical correlation and joint independent component analysis (mCCA + jICA) model for data fusion allows shared or distinct abnormalities between modalities to be examined...
January 9, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29314192/parvalbumin-producing-striatal-interneurons-receive-excitatory-inputs-onto-proximal-dendrites-from-the-motor-thalamus-in-male-mice
#19
Yasutake Nakano, Fuyuki Karube, Yasuharu Hirai, Kenta Kobayashi, Hiroyuki Hioki, Shinichiro Okamoto, Hiroshi Kameda, Fumino Fujiyama
In rodents, the dorsolateral striatum regulates voluntary movement by integrating excitatory inputs from the motor-related cerebral cortex and thalamus to produce contingent inhibitory output to other basal ganglia nuclei. Striatal parvalbumin (PV)-producing interneurons receiving this excitatory input then inhibit medium spiny neurons (MSNs) and modify their outputs. To understand basal ganglia function in motor control, it is important to reveal the precise synaptic organization of motor-related cortical and thalamic inputs to striatal PV interneurons...
January 4, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29314108/high-dose-biotin-in-infants-mimics-biochemical-hyperthyroidism-with-some-commercial-assays
#20
Ved Bhushan Arya, Michal Ajzensztejn, Gayle Appleby, Sue Oddy, David Halsall, Krishna Chatterjee, Carla Moran, Tony Hulse
Biotin is a water-soluble B-complex vitamin, which is an essential coenzyme for four carboxylases enzymes involved in intermediary metabolism. Although the recommended daily intake (RDI) is 30 micrograms, doses as high as 100 times the RDI are widely used for dietary supplementation, therapy of several inherited metabolic diseases (biotin-thiamine responsive basal ganglia disease and biotinidase deficiency) and supportive treatment in patients with disorders of mitochondrial energy metabolism. This article is protected by copyright...
January 5, 2018: Clinical Endocrinology
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