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https://www.readbyqxmd.com/read/29466446/the-cannabinoid-1-receptor-is-abundantly-expressed-in-striatal-striosomes-and-striosome-dendron-bouquets-of-the-substantia-nigra
#1
Margaret I Davis, Jill R Crittenden, Austin Y Feng, David A Kupferschmidt, Alipi Naydenov, Nephi Stella, Ann M Graybiel, David M Lovinger
Presynaptic cannabinoid-1 receptors (CB1-R) bind endogenous and exogenous cannabinoids to modulate neurotransmitter release. CB1-Rs are expressed throughout the basal ganglia, including striatum and substantia nigra, where they play a role in learning and control of motivated actions. However, the pattern of CB1-R expression across different striatal compartments, microcircuits and efferent targets, and the contribution of different CB1-R-expressing neurons to this pattern, are unclear. We use a combination of conventional techniques and novel genetic models to evaluate CB1-R expression in striosome (patch) and matrix compartments of the striatum, and in nigral targets of striatal medium spiny projection neurons (MSNs)...
2018: PloS One
https://www.readbyqxmd.com/read/29454663/novel-pla2g6-mutations-and-clinical-heterogeneity-in-chinese-cases-with-phospholipase-a2-associated-neurodegeneration
#2
Yi-Jun Chen, Yu-Chao Chen, Hai-Lin Dong, Li-Xi Li, Wang Ni, Hong-Fu Li, Zhi-Ying Wu
INTRODUCTION: Phospholipase A2-associated neurodegeneration (PLAN) is an autosomal recessive movement disorder with abnormal iron deposition in basal ganglia, substantial nigra and adjacent areas, and cerebellar atrophy. It is caused by PLA2G6 mutations and comprises three phenotypes. We aimed to investigate genetic mutations in patients with predominantly extrapyramidal symptoms. METHODS: Eighteen Chinese patients with early onset of extrapyramidal symptoms were identified and underwent targeted next-generation sequencing, followed by Sanger sequencing...
February 9, 2018: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29449814/multisite-delayed-feedback-for-electrical-brain-stimulation
#3
Oleksandr V Popovych, Peter A Tass
Demand-controlled deep brain stimulation (DBS) appears to be a promising approach for the treatment of Parkinson's disease (PD) as revealed by computational, pre-clinical and clinical studies. Stimulation delivery is adapted to brain activity, for example, to the amount of neuronal activity considered to be abnormal. Such a closed-loop stimulation setup might help to reduce the amount of stimulation current, thereby maintaining therapeutic efficacy. In the context of the development of stimulation techniques that aim to restore desynchronized neuronal activity on a long-term basis, specific closed-loop stimulation protocols were designed computationally...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29444157/does-radiation-therapy-increase-gadolinium-accumulation-in-the-brain-quantitative-analysis-of-t1-shortening-using-r1-relaxometry-in-glioblastoma-multiforme-patients
#4
Woo Hyeon Lim, Seung Hong Choi, Roh-Eul Yoo, Koung Mi Kang, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn
OBJECTIVE: This study evaluated the possibility of accelerated gadolinium accumulation in irradiated brain parenchyma where the blood-brain barrier was weakened. METHODS: From January 2010 to June 2015, 44 patients with supratentorial glioblastoma were retrospectively identified who underwent pre- and post-radiation brain MR imaging, including R1 mapping. The mean dose of administered gadobutrol (Gadovist, Bayer, Germany) was 5.1 vials. Regions of interest (ROIs) were drawn around tumors that were located within 50-100% iso-dose lines of maximum radiation dose...
2018: PloS One
https://www.readbyqxmd.com/read/29439122/iron-insensitive-quantitative-assessment-of-subcortical-gray-matter-demyelination-in-multiple-sclerosis-using-the-macromolecular-proton-fraction
#5
V L Yarnykh, E P Krutenkova, G Aitmagambetova, P Repovic, A Mayadev, P Qian, L K Jung Henson, B Gangadharan, J D Bowen
BACKGROUND AND PURPOSE: Fast macromolecular proton fraction mapping is a recent quantitative MR imaging method for myelin assessment. The objectives of this study were to evaluate the macromolecular proton fraction as a measure of demyelination in subcortical GM structures in multiple sclerosis and assess a potential relationship between demyelination and excess iron deposition using the macromolecular proton fraction and T2* mapping. MATERIALS AND METHODS: Macromolecular proton fraction and T2* maps were obtained from 12 healthy controls, 18 patients with relapsing-remitting MS, and 12 patients with secondary-progressive MS using 3T MR imaging...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29433807/deep-brain-stimulation-for-tardive-syndromes-systematic-review-and-meta-analysis
#6
REVIEW
Antonella Macerollo, Günther Deuschl
Among the broad entity of tardive syndromes, tardive dystonia and classical tardive dyskinesia sometimes require advanced treatments like deep brain stimulation of the globus pallidus internum (Gpi-DBS) or the subthalamic nucleus (STN-DBS). This systematic review has analyzed the currently available literature reporting cases with either tardive dystonia or dyskinesia treated with DBS. The key words for the literature search included all tardive syndromes and "deep brain stimulation." Thirty-four level VI studies and one level II study with 117 patients were included...
February 5, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29433117/-non-cirrhotic-portal-systemic-encephalopathy-with-total-aphasia-and-right-hemiplegia-following-transient-right-hemiparesis-a-case-report
#7
Hirofumi Goto, Tatsuya Tanaka, Natsuki Suetsugi, Yoshihito Kubotsu, Nobuaki Momozaki, Toshihiko Mizuta
A 77-year-old right-handed woman without any liver diseases was admitted to our hospital because of transient right hemiparesis. She developed total aphasia with right hemiplegia on the third hospital day. We suspected that she had a cerebral infarction following a transient ischemic attack. However, brain diffusion-weighted images revealed no abnormal-intensity lesions, and cerebral angiography showed patent arteries. Additionally, her serum ammonia level was elevated. Theta waves without triphasic waves were detected by electroencephalogram...
February 2018: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/29427049/favourable-outcome-in-a-child-with-symptomatic-diagnosis-of-glutaric-aciduria-type-1-despite-vertical-hiv-infection-and-minor-head-trauma
#8
Angeline Thomas, Els F M Dobbels, Priscilla E Springer, Christelle Ackermann, Mark F Cotton, Barbara Laughton
The first case of Glutaric aciduria Type 1(GA1) in an African child was reported in 2001. GA1 has a prevalence of 1:5000 in black South Africans. Although early diagnosis is essential for a favourable outcome, newborn screening is not routine in South Africa where an estimated 320,000 children have HIV infection. Neurodevelopmental delay and encephalopathy are complications of both HIV and GA1. In such a setting it is important to recognise that HIV and GA1 can occur simultaneously. We present an HIV-infected South African male child of Xhosa descent with macrocephaly who commenced combination antiretroviral therapy (ART) at 8 weeks of age in a clinical trial which included a neurodevelopmental sub-study...
February 9, 2018: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29422442/pallidal-deep-brain-stimulation-modulates-excessive-cortical-high-%C3%AE-phase-amplitude-coupling-in-parkinson-disease
#9
Mahsa Malekmohammadi, Nicholas AuYong, Joni Ricks-Oddie, Yvette Bordelon, Nader Pouratian
OBJECTIVE: Deep brain stimulation (DBS) of the subthalamic nucleus (STN) and globus pallidus internus (GPi) are equally efficacious in the management of Parkinson disease (PD). Studies of STN-DBS have revealed a therapeutic reduction in excessive cortical β-γ phase-amplitude coupling (PAC). It is unclear whether this is specific to STN-DBS and potentially mediated by modulation of the hyperdirect pathway or if it is a generalizable mechanism seen with DBS of other targets. Moreover, it remains unclear how cortical signals are differentially modulated by movement versus therapy...
January 31, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29419400/high-signal-intensity-in-the-dentate-nucleus-and-globus-pallidus-on-unenhanced-t1-weighted-mr-images-comparison-between-gadobutrol-and-linear-gadolinium-based-contrast-agents
#10
F G Moser, C T Watterson, S Weiss, M Austin, J Mirocha, R Prasad, J Wang
BACKGROUND AND PURPOSE: In view of the recent observations that gadolinium deposits in brain tissue after intravenous injection, our aim of this study was to compare signal changes in the globus pallidus and dentate nucleus on unenhanced T1-weighted MR images in patients receiving serial doses of gadobutrol, a macrocyclic gadolinium-based contrast agent, with those seen in patients receiving linear gadolinium-based contrast agents. MATERIALS AND METHODS: This was a retrospective analysis of on-site patients with brain tumors...
February 1, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29414819/dbstar-an-open-source-tool-kit-for-imaging-analysis-with-patient-customized-deep-brain-stimulation-platforms
#11
Peter M Lauro, Shane Lee, Minkyu Ahn, Andrei Barborica, Wael F Asaad
BACKGROUND/OBJECTIVES: To create an open-source method for reconstructing microelectrode recording (MER) and deep brain stimulation (DBS) electrode coordinates along multiple parallel trajectories with patient-specific DBS implantation platforms to facilitate DBS research. METHODS: We combined the surgical geometry (extracted from WayPoint Planner), pre-/intra-/postoperative computed tomography (CT) and/or magnetic resonance (MR) images, and integrated them into the Analysis of Functional NeuroImages (AFNI) neuroimaging analysis environment using functions written in Python...
February 7, 2018: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/29396066/successful-deep-brain-stimulation-for-central-post-stroke-pain-and-dystonia-in-a-single-operation
#12
Marshall T Holland, Mario Zanaty, Luyuan Li, Teri Thomsen, James H Beeghly, Jeremy D W Greenlee, Chandan G Reddy
BACKGROUND: Central post-stroke pain is known to be refractory to medications and difficult to manage. We present a case of central post-stroke pain associated with dystonia. Both conditions were successfully treated with a single deep brain stimulation (DBS) operation. CASE DESCRIPTION: A 60-year-old female suffered a right posterior cerebral artery stroke following emergent clipping of a ruptured posterior cerebral artery aneurysm resulting in central post-stroke pain...
January 26, 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29382362/hypermanganesemia-due-to-mutations-in-slc39a14-further-insights-into-mn-deposition-in-the-central-nervous-system
#13
L Marti-Sanchez, J D Ortigoza-Escobar, A Darling, M Villaronga, H Baide, M Molero-Luis, M Batllori, M I Vanegas, J Muchart, L Aquino, R Artuch, A Macaya, M A Kurian, Pérez Dueñas
BACKGROUND: The SLC39A14, SLC30A10 and SLC39A8 are considered to be key genes involved in manganese (Mn) homeostasis in humans. Mn levels in plasma and urine are useful tools for early recognition of these disorders. We aimed to explore further biomarkers of Mn deposition in the central nervous system in two siblings presenting with acute dystonia and hypermanganesemia due to mutations in SLC39A14. These biomarkers may help clinicians to establish faster and accurate diagnosis and to monitor disease progression after chelation therapy is administered...
January 30, 2018: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/29381890/tau-positron-emission-tomography-imaging-in-degenerative-parkinsonisms
#14
REVIEW
Chul Hyoung Lyoo, Hanna Cho, Jae Yong Choi, Young Hoon Ryu, Myung Sik Lee
In recent years, several radiotracers that selectively bind to pathological tau proteins have been developed. Evidence is emerging that binding patterns of in vivo tau positron emission tomography (PET) studies in Alzheimer's disease (AD) patients closely resemble the distribution patterns of known neurofibrillary tangle pathology, with the extent of tracer binding reflecting the clinical and pathological progression of AD. In Lewy body diseases (LBD), tau PET imaging has clearly revealed cortical tau burden with a distribution pattern distinct from AD and increased cortical binding within the LBD spectrum...
January 2018: Journal of Movement Disorders
https://www.readbyqxmd.com/read/29379952/acute-brain-lesions-on-magnetic-resonance-imaging-and-delayed-neurological-sequelae-in-carbon-monoxide-poisoning
#15
Sang-Beom Jeon, Chang Hwan Sohn, Dong-Woo Seo, Bum Jin Oh, Kyoung Soo Lim, Dong-Wha Kang, Won Young Kim
Importance: Preventing delayed neurological sequelae is a major goal of treating acute carbon monoxide poisoning, but to our knowledge there are no reliable tools for assessing the probability of these sequelae. Objectives: To determine whether acute brain lesions on diffusion-weighted imaging are related to subsequent development of delayed neurological sequelae after acute carbon monoxide poisoning. Design, Setting, and Participants: This registry-based observational study was conducted at a university hospital in Seoul, Korea, between April 1, 2011, and December 31, 2015...
January 29, 2018: JAMA Neurology
https://www.readbyqxmd.com/read/29371252/looking-deep-into-the-eye-of-the-tiger-in-pantothenate-kinase-associated-neurodegeneration
#16
J-H Lee, A Gregory, P Hogarth, C Rogers, S J Hayflick
BACKGROUND AND PURPOSE: A detailed delineation of the MR imaging changes in the globus pallidus in pantothenate kinase-associated neurodegeneration will be helpful for diagnosis and monitoring of patients. The aim of this study was to determine the morphologic spectrum of the "eye-of-the-tiger" sign and the topographic pattern of iron deposition in a group of patients with pantothenate kinase-associated neurodegeneration. MATERIALS AND METHODS: Seventy-four MR imaging scans from 54 individuals with PANK2 mutations were analyzed for signal patterns in the globus pallidus...
January 25, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29369401/pallidal-deep-brain-stimulation-modulates-cortical-excitability-and-plasticity
#17
Zhen Ni, Sang Jin Kim, Nicolas Phielipp, Soumya Ghosh, Kaviraja Udupa, Carolyn A Gunraj, Utpal Saha, Mojgan Hodaie, Suneil K Kalia, Andres M Lozano, Darrin J Lee, Elena Moro, Alfonso Fasano, Mark Hallett, Anthony E Lang, Robert Chen
OBJECTIVE: Internal globus pallidus (GPi) deep brain stimulation (DBS) relieves symptoms in dystonia patients. However, the physiological effects produced by GPi DBS are not fully understood. In particular, how a single-pulse GPi DBS changes cortical circuits has never been investigated. We studied the modulation of motor cortical excitability and plasticity with single-pulse GPi DBS in dystonia patients with bilateral implantation of GPi DBS. METHODS: The cortical evoked potentials from DBS were recorded with electroencephalography...
January 25, 2018: Annals of Neurology
https://www.readbyqxmd.com/read/29359833/functional-connectivity-maps-based-on-hippocampal-and-thalamic-dynamics-may-account-for-the-default-mode-network
#18
Tien-Wen Lee, Shao-Wei Xue
The default-mode network (DMN) has been reported to comprise a set of inter-connected transmodal cortical areas, including the posterior cingulate cortex (PCC), medial prefrontal cortex, posterior inferior parietal lobule, lateral temporal region, and others. However, the subcortical constituents of the DMN are still not clear. This study aimed to examine whether the correlation maps derived from subcortical structures may also account for neural pattern of the DMN. Structural magnetic resonance imaging (MRI) and resting state functional MRI scans of 36 subjects were selected from the Rockland sample (Nathan Kline Institute)...
January 23, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29356826/globus-pallidus-interna-or-subthalamic-nucleus-deep-brain-stimulation-for-parkinson-disease-a-review
#19
Adolfo Ramirez-Zamora, Jill L Ostrem
Importance: Selection of the best deep brain stimulation (DBS) target-subthalamic nucleus (STN) or globus pallidus interna (GPi)-for treatment of motor complications in Parkinson disease remains a matter of debate. Observations: Increasing evidence from randomized clinical trials indicates that motor benefit is similar between both targets, including an effect on dyskinesia and improvement in quality of life. Deep brain stimulation of the STN offers consistently greater dopaminergic medication reduction, possible mild benefit in nonmotor domains, and potential economic advantage...
January 22, 2018: JAMA Neurology
https://www.readbyqxmd.com/read/29351243/awake-versus-asleep-deep-brain-stimulation-surgery-technical-considerations-and-critical-review-of-the-literature
#20
REVIEW
Ryan B Kochanski, Sepehr Sani
Advancements in neuroimaging have led to a trend toward direct, image-based targeting under general anesthesia without the use of microelectrode recording (MER) or intraoperative test stimulation, also referred to as "asleep" deep brain stimulation (DBS) surgery. Asleep DBS, utilizing imaging in the form of intraoperative computed tomography (iCT) or magnetic resonance imaging (iMRI), has demonstrated reliable targeting accuracy of DBS leads implanted within the globus pallidus and subthalamic nucleus while also improving clinical outcomes in patients with Parkinson's disease...
January 19, 2018: Brain Sciences
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