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neurovascular reactivity

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https://www.readbyqxmd.com/read/29593520/iclinfmri-software-for-integrating-functional-mri-techniques-in-presurgical-mapping-and-clinical-studies
#1
Ai-Ling Hsu, Ping Hou, Jason M Johnson, Changwei W Wu, Kyle R Noll, Sujit S Prabhu, Sherise D Ferguson, Vinodh A Kumar, Donald F Schomer, John D Hazle, Jyh-Horng Chen, Ho-Ling Liu
Task-evoked and resting-state (rs) functional magnetic resonance imaging (fMRI) techniques have been applied to the clinical management of neurological diseases, exemplified by presurgical localization of eloquent cortex, to assist neurosurgeons in maximizing resection while preserving brain functions. In addition, recent studies have recommended incorporating cerebrovascular reactivity (CVR) imaging into clinical fMRI to evaluate the risk of lesion-induced neurovascular uncoupling (NVU). Although each of these imaging techniques possesses its own advantage for presurgical mapping, a specialized clinical software that integrates the three complementary techniques and promptly outputs the analyzed results to radiology and surgical navigation systems in a clinical format is still lacking...
2018: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/29580963/neurovascular-coupling-during-visual-stimulation-in-multiple-sclerosis-a-meg-fmri-study
#2
Rachael Stickland, Marek Allen, Lorenzo Magazzini, Krish D Singh, Richard G Wise, Valentina Tomassini
The process of neurovascular coupling ensures that increases in neuronal activity are fed by increases in cerebral blood flow. Evidence suggests that neurovascular coupling may be impaired in multiple sclerosis (MS) due to a combination of brain hypoperfusion, altered cerebrovascular reactivity and oxygen metabolism, and altered levels of vasoactive compounds. Here, we tested the hypothesis that neurovascular coupling is impaired in MS. We characterised neurovascular coupling as the relationship between changes in neuronal oscillatory power within the gamma frequency band (30-80 Hz), as measured by magnetoencephalography (MEG), and associated haemodynamic changes (blood oxygenation level dependent, BOLD, and cerebral blood flow, CBF)as measured by functional MRI...
March 23, 2018: Neuroscience
https://www.readbyqxmd.com/read/29570780/effects-of-ischemic-postconditioning-on-neuronal-vegf-regulation-and-microglial-polarization-in-a-rat-model-of-focal-cerebral-ischemia
#3
Elga Esposito, Kazuhide Hayakawa, Bum Ju Ahn, Su Jing Chan, Changhong Xing, Anna C Liang, Kyu-Won Kim, Ken Arai, Eng H Lo
Ischemic postconditioning is increasingly being investigated as a therapeutic approach for cerebral ischemia. However, the majority of studies are focused on the acute protection of neurons per se. Whether and how postconditioning affects multiple cells in the recovering neurovascular unit remains to be fully elucidated. Here, we asked whether postconditioning may modulate help-me signaling between injured neurons and reactive microglia. Rats were subjected to 100 min of focal cerebral ischemia, then randomized into a control versus postconditioning group...
March 23, 2018: Journal of Neurochemistry
https://www.readbyqxmd.com/read/29553570/skeletal-muscle-neurovascular-coupling-oxidative-capacity-and-microvascular-function-with-one-stop-shop-near-infrared-spectroscopy
#4
Ryan Rosenberry, Susie Chung, Michael D Nelson
Exercise represents a major hemodynamic stress that demands a highly coordinated neurovascular response in order to match oxygen delivery to metabolic demand. Reactive hyperemia (in response to a brief period of tissue ischemia) is an independent predictor of cardiovascular events and provides important insight into vascular health and vasodilatory capacity. Skeletal muscle oxidative capacity is equally important in health and disease, as it determines the energy supply for myocellular processes. Here, we describe a simple, non-invasive approach using near-infrared spectroscopy to assess each of these major clinical endpoints (reactive hyperemia, neurovascular coupling, and muscle oxidative capacity) during a single clinic or laboratory visit...
February 20, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29466947/stroke-as-an-atypical-initial-presentation-of-giant-cell-arteritis
#5
Tharsika Kuganesan, Allen R Huang
BACKGROUND: Giant cell arteritis (GCA) is an immune mediated inflammatory disease of medium and large arteries which afflicts older people. The classical presentation features include: headache, visual disturbances, and jaw claudication. Patients diagnosed with GCA have also been observed to be at higher risk for the subsequent development of strokes. CASE PRESENTATION: We describe a case of an 84-year old right-handed man who presented to hospital with dysarthria, dysphagia, right-sided facial drop, a history of generalized weakness and multiple falls...
February 21, 2018: BMC Geriatrics
https://www.readbyqxmd.com/read/29447850/impact-of-baseline-co-2-on-blood-oxygenation-level-dependent-mri-measurements-of-cerebrovascular-reactivity-and-task-evoked-signal-activation
#6
Christiaan Hendrik Bas van Niftrik, Marco Piccirelli, Oliver Bozinov, Nicolai Maldaner, Catherine Strittmatter, Athina Pangalu, Antonios Valavanis, Luca Regli, Jorn Fierstra
Neurovascular coupling describes the cascade between neuronal activity and subsequent Blood-Oxygenation-Level-Dependent (BOLD) signal increase. Based on this premise, the correlation of this BOLD signal increase with a particular task, such as finger-tapping, is used to map neuronal activation. This signal increase may be dampened in brain areas exhibiting impaired cerebrovascular reactivity (BOLD-CVR), leading to false negative activation. Blood-oxygenation-level-dependent (BOLD) cerebrovascular reactivity (CVR) has also been used to optimize task evoked BOLD signal changes...
February 13, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29432609/impaired-cerebral-hemodynamics-and-frailty-in-patients-with-cardiovascular-disease
#7
Miri Lutski, Salo Haratz, Galit Weinstein, Uri Goldbourt, David Tanne
Background: Recent studies suggest that impaired cerebrovascular reactivity (CVR), a marker of cerebral microvascular damage, is associated with a higher risk of stroke, cognitive decline and mortality. We tested whether abnormal cerebrovascular status is associated with late-life frailty among men with pre-existing cardiovascular disease. Methods: A subset of 327 men (mean age at baseline 56.7±6.5 years) who previously participated in the Bezafibrate Infarction Prevention (BIP) trial (1990-1997) and then in the BIP Neurocognitive study underwent a neurovascular evaluation 14...
February 8, 2018: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29405550/treatment-with-the-mitochondrial-targeted-antioxidant-peptide-ss-31-rescues-neurovascular-coupling-responses-and-cerebrovascular-endothelial-function-and-improves-cognition-in-aged-mice
#8
Stefano Tarantini, Noa M Valcarcel-Ares, Andriy Yabluchanskiy, Gabor A Fulop, Peter Hertelendy, Tripti Gautam, Eszter Farkas, Aleksandra Perz, Peter S Rabinovitch, William E Sonntag, Anna Csiszar, Zoltan Ungvari
Moment-to-moment adjustment of cerebral blood flow (CBF) via neurovascular coupling has an essential role in maintenance of healthy cognitive function. In advanced age, increased oxidative stress and cerebromicrovascular endothelial dysfunction impair neurovascular coupling, likely contributing to age-related decline of higher cortical functions. There is increasing evidence showing that mitochondrial oxidative stress plays a critical role in a range of age-related cellular impairments, but its role in neurovascular uncoupling remains unexplored...
February 6, 2018: Aging Cell
https://www.readbyqxmd.com/read/29382846/a-novel-human-induced-pluripotent-stem-cell-blood-brain-barrier-model-applicability-to-study-antibody-triggered-receptor-mediated-transcytosis
#9
Maria Ribecco-Lutkiewicz, Caroline Sodja, Julie Haukenfrers, Arsalan S Haqqani, Dao Ly, Peter Zachar, Ewa Baumann, Marguerite Ball, Jez Huang, Marina Rukhlova, Marzia Martina, Qing Liu, Danica Stanimirovic, Anna Jezierski, Mahmud Bani-Yaghoub
We have developed a renewable, scalable and transgene free human blood-brain barrier model, composed of brain endothelial cells (BECs), generated from human amniotic fluid derived induced pluripotent stem cells (AF-iPSC), which can also give rise to syngeneic neural cells of the neurovascular unit. These AF-iPSC-derived BECs (i-BEC) exhibited high transendothelial electrical resistance (up to 1500 Ω cm2) inducible by astrocyte-derived molecular cues and retinoic acid treatment, polarized expression of functional efflux transporters and receptor mediated transcytosis triggered by antibodies against specific receptors...
January 30, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29373286/trpc-proteins-contribute-to-development-of-diabetic-retinopathy-and-regulate-glyoxalase-1-activity-and-methylglyoxal-accumulation
#10
Robin Sachdeva, Andrea Schlotterer, Dagmar Schumacher, Christin Matka, Ilka Mathar, Nadine Dietrich, Rebekka Medert, Ulrich Kriebs, Jihong Lin, Peter Nawroth, Lutz Birnbaumer, Thomas Fleming, Hans-Peter Hammes, Marc Freichel
OBJECTIVE: Diabetic retinopathy (DR) is induced by an accumulation of reactive metabolites such as ROS, RNS, and RCS species, which were reported to modulate the activity of cation channels of the TRPC family. In this study, we use Trpc1/4/5/6-/- compound knockout mice to analyze the contribution of these TRPC proteins to diabetic retinopathy. METHODS: We used Nanostring- and qPCR-based analysis to determine mRNA levels of TRPC channels in control and diabetic retinae and retinal cell types...
January 5, 2018: Molecular Metabolism
https://www.readbyqxmd.com/read/29320772/a-perfect-storm-the-role-of-the-mammalian-target-of-rapamycin-mtor-in-cerebrovascular-dysfunction-of-alzheimer-s-disease-a-mini-review
#11
Candice E Van Skike, Veronica Galvan
Cerebrovascular dysfunction is detected prior to the onset of cognitive and histopathological changes in Alzheimer's disease (AD). Increasing evidence indicates a critical role of cerebrovascular dysfunction in the initiation and progression of AD. Recent studies identified the mechanistic/mammalian target of rapamycin (mTOR) as a critical effector of cerebrovascular dysfunction in AD. mTOR has a key role in the regulation of metabolism, but some mTOR-dependent mechanisms are uniquely specific to the regulation of cerebrovascular function...
2018: Gerontology
https://www.readbyqxmd.com/read/29285816/arterialized-collateral-capillaries-progress-from-non-reactive-to-capable-of-increasing-perfusion-in-an-ischemic-tree
#12
Kenneth H Gouin, Sara K Hellstrom, Lindsay E Clegg, Joshua Cutts, Feilim Mac Gabhann, Trevor R Cardinal
OBJECTIVE: Collateral capillary arteriogenenesis (CCA), outward remodeling of capillaries that anastomose two arteriolar trees with different parent feed arteries, may represent a therapeutic target for patients who lack collaterals. Arterialized collateral capillaries (ACCs) can reperfuse an ischemic tree, but their functional capacity is unknown. Therefore, we determined if ACCs mature into resistance vessels that regulate blood flow following arterial occlusion. METHODS: We ligated the lateral spinotrapezius feed artery in Balb/C mice, which induces CCA...
December 28, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29162554/sustained-administration-of-corticosterone-at-stress-like-levels-after-stroke-suppressed-glial-reactivity-at-sites-of-thalamic-secondary-neurodegeneration
#13
Katarzyna Zalewska, Giovanni Pietrogrande, Lin Kooi Ong, Mahmoud Abdolhoseini, Murielle Kluge, Sarah J Johnson, Frederick R Walker, Michael Nilsson
Secondary neurodegeneration (SND) is an insidious and progressive condition involving the death of neurons in regions of the brain that were connected to but undamaged by the initial stroke. Our group have published compelling evidence that exposure to psychological stress can significantly exacerbate the severity SND, a finding that has considerable clinical implications given that stroke-survivors often report experiencing high and unremitting levels of psychological stress. It may be possible to use one or more targeted pharmacological approaches to limit the negative effects of stress on the recovery process but in order to move forward with this approach the most critical stress signals have to be identified...
March 2018: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29123083/identification-of-a-peptide-recognizing-cerebrovascular-changes-in-mouse-models-of-alzheimer-s-disease
#14
Aman P Mann, Pablo Scodeller, Sazid Hussain, Gary B Braun, Tarmo Mölder, Kadri Toome, Rajesh Ambasudhan, Tambet Teesalu, Stuart A Lipton, Erkki Ruoslahti
Cerebrovascular changes occur in Alzheimer's disease (AD). Using in vivo phage display, we searched for molecular markers of the neurovascular unit, including endothelial cells and astrocytes, in mouse models of AD. We identified a cyclic peptide, CDAGRKQKC (DAG), that accumulates in the hippocampus of hAPP-J20 mice at different ages. Intravenously injected DAG peptide homes to neurovascular unit endothelial cells and to reactive astrocytes in mouse models of AD. We identified connective tissue growth factor (CTGF), a matricellular protein that is highly expressed in the brain of individuals with AD and in mouse models, as the target of the DAG peptide...
November 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/29018233/altered-neurovascular-coupling-as-measured-by-optical-imaging-a-biomarker-for-alzheimer-s-disease
#15
Konstantin Kotliar, Christine Hauser, Marion Ortner, Claudia Muggenthaler, Janine Diehl-Schmid, Susanne Angermann, Alexander Hapfelmeier, Christoph Schmaderer, Timo Grimmer
Neurovascular coupling can be directly assessed by retinal vessel response to flickering light using optical imaging methods. The response is altered in a number of ocular and cardiovascular diseases. Whether it is altered in Alzheimer's disease (AD) is investigated. Retinal vessel reaction to monochromatic flicker stimulation was examined by Dynamic Vessel Analyzer independent of the commercial software in elderly subjects: 15 patients with mild-to-moderate dementia due to AD (ADD); 24 patients with mild cognitive impairment due to AD (MCI); 15 cognitively healthy controls (HC)...
October 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28986176/diffuse-gliomas-exhibit-whole-brain-impaired-cerebrovascular-reactivity
#16
Jorn Fierstra, Christiaan van Niftrik, Marco Piccirelli, Oliver Bozinov, Athina Pangalu, Niklaus Krayenbühl, Antonios Valavanis, Michael Weller, Luca Regli
PURPOSE: Cerebral diffuse gliomas exhibit perilesional impaired cerebrovascular reactivity (CVR), yet the degree of impairment as well as its full spatial extent in the brain remains unknown. With quantitative fMRI, we studied twelve subjects with untreated brain diffuse glioma and twelve healthy controls to assess CVR impairment and determine its distribution throughout the brain. METHODS: In a prospective case-control study, quantitative CVR measurements were derived from BOLD fMRI volumes during standardized iso-oxic changes in carbon dioxide...
January 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28942458/diabetic-retinopathy-hyperglycaemia-oxidative-stress-and-beyond
#17
REVIEW
Hans-Peter Hammes
Diabetic retinopathy remains a relevant clinical problem. In parallel with diagnostic and therapeutic improvements, the role of glycaemia and reactive metabolites causing cell stress and biochemical abnormalities as treatment targets needs continuous re-evaluation. Furthermore, the basic mechanisms of physiological angiogenesis, remodelling and pruning give important clues about the origins of vasoregression during the very early stages of diabetic retinopathy and can be modelled in animals. This review summarises evidence supporting a role for the neurovascular unit-composed of neuronal, glial and vascular cells-as a responder to the biochemical changes imposed by reactive metabolites and high glucose...
January 2018: Diabetologia
https://www.readbyqxmd.com/read/28925083/selective-knockout-of-astrocytic-na-h-exchanger-isoform-1-reduces-astrogliosis-bbb-damage-infarction-and-improves-neurological-function-after-ischemic-stroke
#18
Gulnaz Begum, Shanshan Song, Shaoxia Wang, Hanshu Zhao, Mohammad Iqbal H Bhuiyan, Eric Li, Rachel Nepomuceno, Qing Ye, Ming Sun, Michael Joseph Calderon, Donna B Stolz, Claudette St Croix, Simon C Watkins, Yinhuai Chen, Pingnian He, Gary E Shull, Dandan Sun
Stimulation of Na+ /H+ exchanger isoform 1 (NHE1) in astrocytes causes ionic dysregulation under ischemic conditions. In this study, we created a Nhe1flox/flox (Nhe1f/f ) mouse line with exon 5 of Nhe1 flanked with two loxP sites and selective ablation of Nhe1 in astrocytes was achieved by crossing Nhe1f/f mice with Gfap-CreERT2 Cre-recombinase mice. Gfap-CreERT2+/- ;Nhe1f/f mice at postnatal day 60-90 were treated with either corn oil or tamoxifen (Tam, 75 mg/kg/day, i.p.) for 5 days. After 30 days post-injection, mice underwent transient middle cerebral artery occlusion (tMCAO) to induce ischemic stroke...
January 2018: Glia
https://www.readbyqxmd.com/read/28804779/language-mapping-using-t2-prepared-bold-functional-mri-in-the-presence-of-large-susceptibility-artifacts-initial-results-in-patients-with-brain-tumor-and-epilepsy
#19
Jun Hua, Xinyuan Miao, Shruti Agarwal, Chetan Bettegowda, Alfredo Quiñones-Hinojosa, John Laterra, Peter C M Van Zijl, James J Pekar, Jay J Pillai
At present, presurgical functional mapping is the most prevalent clinical application of functional magnetic resonance imaging (fMRI). Signal dropouts and distortions caused by susceptibility effects in the current standard echo planar imaging (EPI)-based fMRI images are well-known problems and pose a major hurdle for the application of fMRI in several brain regions, many of which are related to language mapping in presurgical planning. Such artifacts are particularly problematic in patients with previous surgical resection cavities, craniotomy hardware, hemorrhage, and vascular malformation...
June 2017: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28782084/brain-perivascular-macrophages-characterization-and-functional-roles-in-health-and-disease
#20
REVIEW
Giuseppe Faraco, Laibaik Park, Josef Anrather, Costantino Iadecola
Perivascular macrophages (PVM) are a distinct population of resident brain macrophages characterized by a close association with the cerebral vasculature. PVM migrate from the yolk sac into the brain early in development and, like microglia, are likely to be a self-renewing cell population that, in the normal state, is not replenished by circulating monocytes. Increasing evidence implicates PVM in several disease processes, ranging from brain infections and immune activation to regulation of the hypothalamic-adrenal axis and neurovascular-neurocognitive dysfunction in the setting of hypertension, Alzheimer disease pathology, or obesity...
November 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
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