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https://www.readbyqxmd.com/read/29769642/high-resolution-imaging-of-myeloperoxidase-activity-sensors-in-human-cerebrovascular-disease
#1
Youssef Z Wadghiri, Dung Minh Hoang, Anita Leporati, Matthew J Gounis, Aurora Rodríguez-Rodríguez, Mary L Mazzanti, John P Weaver, Ajay K Wakhloo, Peter Caravan, Alexei A Bogdanov
Progress in clinical development of magnetic resonance imaging (MRI) substrate-sensors of enzymatic activity has been slow partly due to the lack of human efficacy data. We report here a strategy that may serve as a shortcut from bench to bedside. We tested ultra high-resolution 7T MRI (µMRI) of human surgical histology sections in a 3-year IRB approved, HIPAA compliant study of surgically clipped brain aneurysms. µMRI was used for assessing the efficacy of MRI substrate-sensors that detect myeloperoxidase activity in inflammation...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29757216/sphingosine-1-phosphate-receptor-1-is-involved-in-non-obese-diabetic-mouse-thymocyte-migration-disorders
#2
Julia P Lemos, Salete Smaniotto, Carolina V Messias, Otacilio C Moreira, Vinicius Cotta-de-Almeida, Mireille Dardenne, Wilson Savino, Daniella A Mendes-da-Cruz
NOD (non-obese diabetic) mice spontaneously develop type 1 diabetes following T cell-dependent destruction of pancreatic β cells. Several alterations are observed in the NOD thymus, including the presence of giant perivascular spaces (PVS) filled with single-positive (SP) CD4⁺ and CD8⁺ T cells that accumulate in the organ. These cells have a decreased expression of membrane CD49e (the α5 integrin chain of the fibronectin receptor VLA-5 (very late antigen-5). Herein, we observed lower sphingosine-1-phosphate receptor 1 (S1P1) expression in NOD mouse thymocytes when compared with controls, mainly in the mature SP CD4⁺CD62Lhi and CD8⁺CD62Lhi subpopulations bearing the CD49e− phenotype...
May 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29754206/convective-influx-glymphatic-system-tracers-injected-into-the-csf-enter-and-leave-the-brain-along-separate-periarterial-basement-membrane-pathways
#3
Nazira J Albargothy, David A Johnston, Matthew MacGregor-Sharp, Roy O Weller, Ajay Verma, Cheryl A Hawkes, Roxana O Carare
Tracers injected into CSF pass into the brain alongside arteries and out again. This has been recently termed the "glymphatic system" that proposes tracers enter the brain along periarterial "spaces" and leave the brain along the walls of veins. The object of the present study is to test the hypothesis that: (1) tracers from the CSF enter the cerebral cortex along pial-glial basement membranes as there are no perivascular "spaces" around cortical arteries, (2) tracers leave the brain along smooth muscle cell basement membranes that form the Intramural Peri-Arterial Drainage (IPAD) pathways for the elimination of interstitial fluid and solutes from the brain...
May 12, 2018: Acta Neuropathologica
https://www.readbyqxmd.com/read/29752520/mucopolysaccharidoses-overview-of-neuroimaging-manifestations
#4
Manal Nicolas-Jilwan, Moeenaldeen AlSayed
The mucopolysaccharidoses are a heterogeneous group of inherited lysosomal storage disorders, characterized by the accumulation of undegraded glycosaminoglycans in various organs, leading to tissue damage. Mucopolysaccharidoses include eight individual disorders (IS [Scheie syndrome], IH [Hurler syndrome], II, III, IV, VI, VII and IX). They have autosomal-recessive transmission with the exception of mucopolysaccharidosis II, which is X-linked. Each individual disorder has a wide spectrum of phenotypic variation, depending on the specific mutation, from very mild to very severe...
May 11, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29739911/effect-of-antihypertensive-medication-on-cerebral-small-vessel-disease-a-systematic-review-and-meta-analysis
#5
Tessa van Middelaar, Tanja E Argillander, Floris H B M Schreuder, Jaap Deinum, Edo Richard, Catharina J M Klijn
BACKGROUND AND PURPOSE: Hypertension is an important risk factor for cerebral small vessel disease. We aimed to study the effect of antihypertensive medication (AHM) on the progression of cerebral small vessel disease. METHODS: We performed a systematic literature search of electronic databases up to January 30, 2017, for randomized controlled trials on the effect of AHM on ≥1 cerebral small vessel disease magnetic resonance imaging markers (ie, white matter hyperintensities, lacunes, microbleeds, enlarged perivascular spaces, acute small subcortical infarcts, and brain atrophy) after ≥1 year...
May 8, 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29736618/leptomeningeal-form-of-immunoglobulin-g4-related-hypertrophic-meningitis-with-perivascular-spread-a-case-report-and-review-of-the-literature
#6
Jasmina Boban, Selin Ardalı, Majda M Thurnher
PURPOSE: Immunoglobulin G4 (IgG4)-related disease represents a spectrum of fibro-inflammatory disorders that affects various organ systems, including the central nervous system. METHODS: Here we present the case of lgG4-related hypertrophic meningitis with exclusively leptomeningeal involvement and spread via perivascular spaces. RESULTS: A 58-year-old male patient presented with complex partial seizures. Initial computed tomography examination showed left frontal sulcal hyperdensity...
May 7, 2018: Neuroradiology
https://www.readbyqxmd.com/read/29734720/the-role-of-pseudomonas-aeruginosa-exoy-in-an-acute-mouse-lung-infection-model
#7
Christina Kloth, Bastian Schirmer, Antje Munder, Tane Stelzer, Justin Rothschuh, Roland Seifert
The effector protein Exotoxin Y (ExoY) produced by Pseudomonas aeruginosa is injected via the type III secretion system (T3SS) into host cells. ExoY acts as nucleotidyl cyclase promoting the intracellular accumulation of cyclic nucleotides. To what extent nucleotidyl cyclase activity contributes to the pathogenicity of ExoY and which mechanisms participate in the manifestation of lung infection is still unclear. Here, we used an acute airway infection model in mice to address the role of ExoY in lung infection...
May 4, 2018: Toxins
https://www.readbyqxmd.com/read/29729717/immunohistochemical-characterization-of-immune-cell-infiltration-in-feline-glioma
#8
D R Rissi, B F Porter, C E Boudreau, P M Krimer, A D Miller
The relationship between inflammatory cells and tumour biology has been defined in many human intracranial neoplasms, but it is relatively poorly characterized in veterinary medicine. The aim of this study was to define the immune cell infiltration in cases of feline glioma and its possible association with tumour morphology and type. A retrospective search identified 18 gliomas that met inclusion criteria. Tumours were subjected to immunohistochemistry (IHC) for CD3, CD20, Iba1, MAC387 and factor VIII-related antigen...
April 2018: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/29726891/understanding-the-role-of-the-perivascular-space-in-cerebral-small-vessel-disease
#9
Rosalind Brown, Helene Benveniste, Sandra E Black, Serge Charpak, Martin Dichgans, Anne Joutel, Maiken Nedergaard, Kenneth J Smith, Berislav V Zlokovic, Joanna M Wardlaw
Small vessel diseases are a group of disorders that result from pathological alteration of the small blood vessels in the brain, including the small arteries, capillaries and veins. Of the 35-36 million people that are estimated to suffer from dementia worldwide, up to 65% have an SVD component. Furthermore, SVD causes 20-25% of strokes, worsens outcome after stroke and is a leading cause of disability, cognitive impairment and poor mobility. Yet the underlying cause(s) of SVD are not fully understood.Magnetic resonance imaging (MRI) has confirmed enlarged perivascular spaces (PVS) as a hallmark feature of SVD...
May 2, 2018: Cardiovascular Research
https://www.readbyqxmd.com/read/29704892/fluid-outflow-in-the-rat-spinal-cord-the-role-of-perivascular-and-paravascular-pathways
#10
Shinuo Liu, Magdalena A Lam, Alisha Sial, Sarah J Hemley, Lynne E Bilston, Marcus A Stoodley
BACKGROUND: Cerebrospinal fluid (CSF) is thought to flow into the brain via perivascular spaces around arteries, where it mixes with interstitial fluid. The precise details concerning fluid outflow remain controversial. Although fluid dynamics have been studied in the brain, little is known about spinal cord fluid inflow and outflow. Understanding the normal fluid physiology of the spinal cord may give insight into the pathogenesis of spinal cord oedema and CSF disorders such as syringomyelia...
April 29, 2018: Fluids and Barriers of the CNS
https://www.readbyqxmd.com/read/29699385/local-mesenchymal-stem-cell-therapy-in-experimentally-induced-colitis-in-the-rat
#11
Fernando de la Portilla, Yaiza Yuste, Sheila Pereira, Carolina Olano, Maria Victoria Maestre, Francisco Javier Padillo
Background: Multipotent mesenchymal stem cells (MSCs) have been used in inflammatory bowel diseases because of their immunomodulatory and regenerative properties. We investigated their local use in an experimental model of colitis in the rat. Materials and Methods: Colitis was induced into 20 Wistar rats with local TNBS instillation. Allogeneic stem cells were derived from rat adipose tissue and labeled with PKH2 linker dye with creation of a control and a second group treated by a local injection into the rectal wall of 2×10⁶ allogeneic adipose tissue-derived stem cells (ADSCs)...
April 30, 2018: International Journal of Stem Cells
https://www.readbyqxmd.com/read/29681883/compromised-blood-brain-barrier-integrity-is-associated-with-total-magnetic-resonance-imaging-burden-of-cerebral-small-vessel-disease
#12
Yue Li, Man Li, Long Zuo, Qinglei Shi, Wei Qin, Lei Yang, Tao Jiang, Wenli Hu
Objective: Several studies have demonstrated that compromised blood-brain barrier (BBB) integrity may play a pivotal role in the pathogenesis of individual cerebral small vessel disease (cSVD) markers, but the association between BBB permeability and total magnetic resonance imaging (MRI) cSVD burden remains unclear. This study aimed to investigate the relationship between BBB permeability and total MRI cSVD burden. Methods: Consecutive participants without symptomatic stroke history presented for physical examination were enrolled in this cross-sectional study...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29669870/arterial-stiffness-is-associated-with-basal-ganglia-enlarged-perivascular-spaces-and-cerebral-small-vessel-disease-load
#13
Iolanda Riba-Llena, Joan Jiménez-Balado, Xavier Castañé, Anna Girona, Antonio López-Rueda, Xavier Mundet, Carmen I Jarca, José Álvarez-Sabin, Joan Montaner, Pilar Delgado
BACKGROUND AND PURPOSE: We assessed whether the load of cerebral small vessel disease (cSVD) and its individual markers, including lacunes, white matter hyperintensities, microbleeds, and enlarged perivascular spaces (EPVS), are associated with arterial stiffness. METHODS: We evaluated cSVD markers in a cohort of 782 hypertensive individuals without history of stroke or dementia. The load of the disease was calculated using an ordinal scale ranging from 0 to 4 (1 point was given for each of the 4 markers examined)...
May 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29666204/mapping-the-contribution-and-strategic-distribution-patterns-of-neuroimaging-features-of-small-vessel-disease-in-poststroke-cognitive-impairment
#14
Lin Shi, Lei Zhao, Fu Ki Yeung, Shun Yiu Wong, Ronald K T Chan, Ming Fai Tse, Sze Chun Chan, Yee Ching Kwong, Ka Chun Li, Kai Liu, Jill M Abrigo, Alexander Y L Lau, Adrian Wong, Bonnie Y K Lam, Thomas W H Leung, Jianhui Fu, Winnie C W Chu, Vincent C T Mok
OBJECTIVES: Individual neuroimaging features of small vessel disease (SVD) have been reported to influence poststroke cognition. This study aimed to investigate the joint contribution and strategic distribution patterns of multiple types of SVD imaging features in poststroke cognitive impairment. METHODS: We studied 145 first-ever ischaemic stroke patients with MRI and Montreal Cognitive Assessment (MoCA) examined at baseline. The local burdens of acute ischaemic lesion (AIL), white matter hyperintensity, lacune, enlarged perivascular space and cross-sectional atrophy were quantified and entered into support vector regression (SVR) models to associate with the global and domain scores of MoCA...
April 17, 2018: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/29656031/cerebral-small-vessel-disease-and-risk-of-incident-stroke-dementia-and-depression-and-all-cause-mortality-a-systematic-review-and-meta-analysis
#15
REVIEW
S P Rensma, T T van Sloten, L J Launer, C D A Stehouwer
MRI features of cerebral small vessel disease, i.e. white matter hyperintensities, lacunes, microbleeds, perivascular spaces, and cerebral atrophy, may be associated with clinical events, but the strength of these associations remains unclear. We conducted a systematic review and meta-analysis on the association between these features and incident ischaemic and haemorrhagic stroke, all-cause dementia and depression, and all-cause mortality. For the association with stroke, 36 studies were identified (number of individuals/events [n] = 37,987/4,087), for dementia 28 (n = 16,458/1,709), for depression nine (n = 9,538/1,746), and for mortality 28 (n = 23,031/2,558)...
April 12, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29652699/impact-of-the-glymphatic-system-on-the-kinetic-and-distribution-of-gadodiamide-in-the-rat-brain-observations-by-dynamic-mri-and-effect-of-circadian-rhythm-on-tissue-gadolinium-concentrations
#16
Toshiaki Taoka, Gregor Jost, Thomas Frenzel, Shinji Naganawa, Hubertus Pietsch
OBJECTIVES: The glymphatic system is a recently hypothesized waste clearance system of the brain in which perivascular space constitutes a pathway similar to the lymphatic system in other body regions. Sleep and anesthesia are reported to influence the activity of the glymphatic system. Because rats are nocturnal animals, the glymphatic system is expected to be more active during the day. We attempted to elucidate the influence of the glymphatic system for intravenously injected gadodiamide in the rat brain by 2 experiments...
April 12, 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29644257/intravenous-labeling-and-analysis-of-the-content-of-thymic-perivascular-spaces
#17
Roland Ruscher, Kristin A Hogquist
Following development in the thymus, T cells are thought to exit into the periphery predominantly through perivascular spaces (PVS). This exit route is used by conventional T cells, and likely also applies to unconventional T cell subsets, such as precursors of CD8αα and TCRγδ intraepithelial lymphocytes, regulatory T cells and natural killer T cells. Additional cell types might also be found in the PVS and initiate interactions with exiting T cells. The exact content of the PVS, and the processes within, are not well studied...
March 5, 2018: Bio-protocol
https://www.readbyqxmd.com/read/29622551/choroidal-pericytes-promote-subretinal-fibrosis-after-experimental-photocoagulation
#18
Xueting Luo, Shiqi Yang, Jian Liang, Yuanqi Zhai, Mengxi Shen, Junran Sun, Yiji Feng, Xinmin Lu, Hong Zhu, Fenghua Wang, Xiaodong Sun
Subretinal fibrosis results in local destruction of retinal structures and permanent vision loss, representing the end stage of neovascular age-related macular degeneration (AMD). Histological examination of fibrotic specimens from AMD patients has uncovered a wide range of cellular and acellular components. However, their origins and roles in fibrosis remain largely unexplored. Using laser-induced photocoagulation model with Collagen 1α1-GFP reporter mice, we demonstrate by cell-lineage tracing that a subset of pericytes associating with choroidal microvasculature are activated upon injury and infiltrate into subretinal space as significant components of fibrotic lesions...
April 4, 2018: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29604173/cerebral-amyloid-angiopathy-review-of-clinico-radiological-features-and-mimics
#19
REVIEW
Rohit Sharma, Stephanie Dearaugo, Bernard Infeld, Richard O'Sullivan, Richard P Gerraty
Cerebral amyloid angiopathy (CAA) is an important cause of lobar intracerebral haemorrhage (ICH) in the elderly, but has other clinico-radiological manifestations. In the last two decades, certain magnetic resonance imaging (MRI) sequences, namely gradient-recalled echo imaging and the newer and more sensitive susceptibility-weighted imaging, have been utilised to detect susceptibility-sensitive lesions such as cerebral microbleeds and cortical superficial siderosis. These can be utilised sensitively and specifically by the Modified Boston Criteria to make a diagnosis of CAA without the need for 'gold-standard' histopathology from biopsy...
March 31, 2018: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/29587956/-the-blood-brain-barrier-in-ageing-persons
#20
Nina Haaning, Else Marie Damsgaard, Torben Moos
Brain capillary endothelial cells (BECs) form the ultra-tight blood-brain barrier (BBB). The permeability of the BBB increases with increasing age and neurovascular and neurodegenerative diseases. Major defects of the BBB can be initiated by increased permeability to plasma proteins in small arteriosclerotic arteries and release of proteins from degenerating neurons into the brain extracellular space. These proteins deposit in perivascular spaces, and subsequently negatively influence the BECs leading to decreased expression of barrier proteins...
March 26, 2018: Ugeskrift for Laeger
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