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Microvascular function

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https://www.readbyqxmd.com/read/28933255/organizational-hierarchy-and-structural-diversity-of-microvascular-pericytes-in-adult-mouse-cortex
#1
Roger I Grant, David A Hartmann, Robert G Underly, Andrée-Anne Berthiaume, Narayan R Bhat, Andy Y Shih
Smooth muscle cells and pericytes, together called mural cells, coordinate many distinct vascular functions. Canonically, smooth muscle cells are ring-shaped and cover arterioles with circumferential processes, whereas pericytes extend thin processes that run longitudinally along capillaries. In between these canonical mural cell types are cells with features of both smooth muscle cells and pericytes. Recent studies suggest that these transitional cells are critical for controlling blood flow to the capillary bed during health and disease, but there remains confusion on how to identify them and where they are located in the brain microvasculature...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28932635/colony-stimulating-factor-1-induced-aif1-expression-in-tumor-associated-macrophages-enhances-the-progression-of-hepatocellular-carcinoma
#2
Hao Cai, Xiao-Dong Zhu, Jian-Yang Ao, Bo-Gen Ye, Yuan-Yuan Zhang, Zong-Tao Chai, Cheng-Hao Wang, Wen-Kai Shi, Man-Qing Cao, Xiao-Long Li, Hui-Chuan Sun
M2-polarized (alternatively activated) macrophages play an important role in the progression of hepatocellular carcinoma (HCC). Allograft inflammatory factor 1 (AIF1) is overexpressed in M2-polarized macrophages. This study explored the role of AIF1 in tumor-associated macrophages in HCC. Macrophages were stimulated with colony-stimulating factor 1 (CSF1) to characterize the regulatory pathway of AIF1 in macrophages. The chromatin immunoprecipitation and luciferase reporter gene assay were conducted to examine transcription factors associated with AIF1 expression...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28931920/evaluation-of-circulating-levels-of-ccn2-connective-tissue-growth-factor-in-patients-with-st-elevation-myocardial-infarction
#3
Vibeke Ritschel, Christian Shetelig, Ingebjørg Seljeflot, Shanmuganathan Limalanathan, Pavel Hoffmann, Sigrun Halvorsen, Harald Arnesen, Jan Eritsland, Geir Øystein Andersen
CCN2/Connective tissue growth factor seems to be involved in development of cardiac hypertrophy and fibrosis, but a possible cardioprotective role in left ventricular (LV) remodelling following myocardial infarction has also been suggested. The main objectives of the study were therefore to investigate whether circulating CCN2 levels were associated with infarct size, LV function, adverse remodelling or clinical outcome in two cohorts of patients with ST-elevation myocardial infarction (STEMI). CCN2 was measured in 988 patients 18 hours after PCI and clinical events were recorded after 55 months in the BAMI cohort...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28930839/a-novel-use-of-hill-function-and-utility-of-99mtc-mibi-scintigraphy-to-detect-earlier-lower-extremity-microvascular-perfusion-in-patients-with-type-2-diabetes
#4
Yingsha Li, Qiang Li, Shenju Liang, Xia Liang, Wen Zhou, Hongbo He, Rongbing Jin, Kaifa Wang, Zhiming Zhu, Zhencheng Yan
We use the Hill function to analyze the dynamics of Tc-99m 2 methoxy-isobutyl-isonitrile (Tc-MIBI) scintigraphy data and to examine the earlier lower extremity microvascular perfusion of diabetic patients without typical clinical symptoms and with the preserved normal ankle-brachial index (ABI).Eighty-eight participants (30 healthy control, 34 diabetic patients, and 24 diabetic patients with peripheral arterial disease [PAD]) were recruited and applied Tc-MIBI scintigraphy. Fourteen diabetic patients with PAD also underwent computed tomography angiography (CTA) examination and were performed endovascular interventions...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28930571/role-of-pericytes-in-vascular-immunosurveillance
#5
Konstantin Stark, Kami Pekayvaz, Steffen Massberg
Pericytes build together with endothelial cells the microvascular vessel wall. They have been mainly implicated in angiogenesis and maintenance of the blood brain barrier, but there is accumulating evidence for an immunological function of pericytes. Occupying a strategic position between the blood stream and the interstitial space, pericytes are able to sense environmental cues from both sides in an organ-specific manner and serve as gatekeepers for innate immune cells. In addition, pericytes are able to interact with leukocytes mediated by adhesion molecules as well as chemokines and are involved from the development of leukocytes in the bone marrow to their migration to injured or infected areas in target tissues...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28929564/prefronto-temporal-white-matter-microstructural-alterations-20%C3%A2-years-after-the-diagnosis-of-type-1-diabetes-mellitus
#6
Sujung Yoon, Jungyoon Kim, Gail Musen, Perry F Renshaw, Jaeuk Hwang, Nicolas R Bolo, Jieun E Kim, Donald C Simonson, Katie Weinger, Christopher M Ryan, In Kyoon Lyoo, Alan M Jacobson
OBJECTIVE: Microvascular pathophysiology that uniquely manifests as white matter (WM) abnormalities is often implicated in type 1 diabetes mellitus (T1DM)-related central nervous system (CNS) complications. This study sought to identify regional WM abnormalities in young adults diagnosed with T1DM and further examine their association with cognitive and emotional dysfunction. RESEARCH DESIGN AND METHODS: Diffusion tensor images (DTI) obtained from 34 young adults with T1DM for ≥15 years (mean duration, 20...
September 20, 2017: Pediatric Diabetes
https://www.readbyqxmd.com/read/28927910/hearing-outcome-following-microvascular-decompression-for-hemifacial-spasm-series-of-1434-cases
#7
Na Young Jung, Si Woo Lee, Chang Kyu Park, Won Seok Chang, Hyun Ho Jung, Jin Woo Chang
OBJECTIVE: Although hearing impairment after microvasuclar decompression (MVD) for hemifacial spasm (HFS) is not common, its occurrence could detrimentally affect the patient`s surgical outcome. The object of this study is to address the optimal approaches for reducing postoperative hearing problems after MVD for HFS. METHODS: We retrospectively analyzed the medical records of patients with HFS who underwent MVD with the same surgeon at our institute from March 2003 to October 2016, and reviewed the pertinent literature...
September 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28927665/fgd5-sustains-vascular-endothelial-growth-factor-a-vegfa-signaling-through-inhibition-of-proteasome-mediated-vegf-receptor-2-degradation
#8
Johan Heldin, Paul O'Callaghan, Rodrigo Hernández Vera, Peder Fredlund Fuchs, Pär Gerwins, Johan Kreuger
The complete repertoire of endothelial functions elicited by FGD5, a guanine nucleotide exchange factor activating the Rho GTPase Cdc42, has yet to be elucidated. Here we explore FGD5's importance during vascular endothelial growth factor A (VEGFA) signaling via VEGF receptor 2 (VEGFR2) in human endothelial cells. In microvascular endothelial cells, FGD5 is located at the inner surface of the cell membrane as well as at the outer surface of EEA1-positive endosomes carrying VEGFR2. The latter finding prompted us to explore if FGD5 regulates VEGFR2 dynamics...
September 16, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28923828/attenuated-pdgf-signaling-drives-alveolar-and-microvascular-defects-in-neonatal-chronic-lung%C3%A2-disease
#9
Prajakta Oak, Tina Pritzke, Isabella Thiel, Markus Koschlig, Daphne S Mous, Anita Windhorst, Noopur Jain, Oliver Eickelberg, Kai Foerster, Andreas Schulze, Wolfgang Goepel, Tobias Reicherzer, Harald Ehrhardt, Robbert J Rottier, Peter Ahnert, Ludwig Gortner, Tushar J Desai, Anne Hilgendorff
Neonatal chronic lung disease (nCLD) affects a significant number of neonates receiving mechanical ventilation with oxygen-rich gas (MV-O2). Regardless, the primary molecular driver of the disease remains elusive. We discover significant enrichment for SNPs in the PDGF-Rα gene in preterms with nCLD and directly test the effect of PDGF-Rα haploinsufficiency on the development of nCLD using a preclinical mouse model of MV-O2 In the context of MV-O2, attenuated PDGF signaling independently contributes to defective septation and endothelial cell apoptosis stemming from a PDGF-Rα-dependent reduction in lung VEGF-A...
September 18, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28921743/exercise-training-dose-differentially-alters-muscle-and-heart-capillary-density-and-metabolic-functions-in-an-obese-rat-with-metabolic-syndrome
#10
Marcus Vinicius Machado, Aline Bomfim Vieira, Fabiana Gomes da Conceição, Alessandro Rodrigues Nascimento, Antonio Claudio Lucas da Nóbrega, Eduardo Tibirica
We evaluated the effect of frequency, duration and intensity of exercise training on metabolic parameters and structural capillary density in obese rats with metabolic syndrome (MS). Wistar-Kyoto rats were fed a either standard commercial diet (CON) or high-fat diet (HFD). Animals that received the HFD were randomly separated into either a sedentary (SED) group or 8 different exercise groups that varied by the frequency, duration and intensity of training. After 12 weeks of aerobic exercise training, body composition, aerobic capacity, hemodynamic variables, metabolic parameters and capillary density in the heart and skeletal muscle were evaluated...
September 17, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28916547/automated-measurement-of-microvascular-function-reveals-dysfunction-in-systemic-sclerosis-a-cross-sectional-study
#11
Daniel R Machin, Phillip E Gates, Hans Vink, Tracy M Frech, Anthony J Donato
OBJECTIVE: The aim of our study was to determine whether an automated capture and analysis system could detect differences in structure and function of sublingual microvessels in patients with systemic sclerosis (SSc) compared to healthy controls. METHODS: Intravital microscopy of the sublingual microcirculation was automatically captured and analyzed in 40 patients with SSc and 10 age-matched healthy controls. RESULTS: Total and perfused microvascular density were lower in patients with SSc compared with controls (total microvascular density: 2471 ± 134 μm/mm(2) vs 3067 ± 197 μm/mm(2), p = 0...
September 15, 2017: Journal of Rheumatology
https://www.readbyqxmd.com/read/28915818/the-impact-of-cardiovascular-co-morbidities-and-duration-of-diabetes-on-the-association-between-microvascular-function-and-glycaemic-control
#12
F Casanova, D D Adingupu, F Adams, K M Gooding, H C Looker, K Aizawa, F Dove, S Elyas, J J F Belch, P E Gates, R C Littleford, M Gilchrist, H M Colhoun, A C Shore, F Khan, W D Strain
BACKGROUND: Good glycaemic control in type 2 diabetes (T2DM) protects the microcirculation. Current guidelines suggest glycaemic targets be relaxed in advanced diabetes. We explored whether disease duration or pre-existing macrovascular complications attenuated the association between hyperglycaemia and microvascular function. METHODS: 743 participants with T2DM (n = 222), cardiovascular disease (CVD = 183), both (n = 177) or neither (controls = 161) from two centres in the UK, underwent standard clinical measures and endothelial dependent (ACh) and independent (SNP) microvascular function assessment using laser Doppler imaging...
September 15, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28913317/reconstruction-of-a-complex-scalp-defect-after-the-failure-of-free-flaps-changing-plans-and-strategy
#13
Youn Hwan Kim, Gyeong Hoe Kim, Sang Wha Kim
The ideal scalp reconstruction involves closure of the defect with similar hair-bearing local tissue in a single step. Various reconstructions can be used including primary closure, secondary healing, skin grafts, local flaps, and microvascular tissue transfer. A 53-year-old female patient suffered glioblastoma, which had recurred for the second time. The neurosurgeons performed radial debridement and an additional resection of the tumor, followed by reconstruction using a serratus anterior muscle flap with a split-thickness skin graft...
June 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28912211/body-mass-index-is-associated-with-microvascular-endothelial-dysfunction-in-patients-with-treated-metabolic-risk-factors-and-suspected-coronary-artery-disease
#14
Dirk J van der Heijden, Maarten A H van Leeuwen, Gladys N Janssens, Mattie J Lenzen, Peter M van de Ven, Etto C Eringa, Niels van Royen
BACKGROUND: Obesity is key feature of the metabolic syndrome and is associated with high cardiovascular morbidity and mortality. Obesity is associated with macrovascular endothelial dysfunction, a determinant of outcome in patients with coronary artery disease. Here, we compared the influence of obesity on microvascular endothelial function to that of established cardiovascular risk factors such as diabetes mellitus, hypertension, hypercholesterolemia, and smoking in patients with suspected coronary artery disease...
September 14, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28910897/-the-application-of-microvascular-anastomotic-coupler-in-vascular-anastomosis-of-free-tissue-flap-for-reconstruction-of-defect-after-head-and-neck-cancer-resection
#15
Y J Zhang, Z H Wang, C H Li, J Chen
Objective: To investigate the application and operation skills in vein anastomosis by microvascular anastomotic coupler (MAC) in reconstruction of defects after head and neck cancer resection. Methods: From August 2015 to July 2016, in Department of Head and Neck Surgery, Sichuan Cancer Hosipital, 17 cases underwent the reconstruction of defects after head and neck cancer resection with free tissue flaps, including forearm flaps in 11 casess, anterolateral flaps in 4 casess and fibula flaps in 2 casess. Totally 17 MAC were used, including 14 MAC for end-to-end anastomosis and 3 MAC for end-to-side anastomosis...
September 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28910489/nucleoside-nucleotide-reverse-transcriptase-inhibitors-attenuate-angiogenesis-and-lymphangiogenesis-by-impairing-receptor-tyrosine-kinases-signalling-in-endothelial-cells
#16
Lin Song, Sha Ding, Zhen Ge, Xiaolong Zhu, Cong Qiu, Yuewen Wang, Enyin Lai, Weijun Yang, Yi Sun, Samson A Chow, Luyang Yu
BACKGROUND AND PURPOSE: Cardiovascular disease associated with antiretroviral therapy (ART) has become a major clinical challenge for HIV-positive patients. However, the role of ART in blood vessel growth is largely unknown. Here, we examined an integral component of ART, nucleoside/nucleotide reverse transcriptase inhibitors (NRTIs), and investigated their effects on key microvascular functions, including angiogenesis and lymphangiogenesis. EXPERIMENTAL APPROACH: The angiogenesis/lymphangiogenesis capability of endothelial cells (ECs) was evaluated using migration, proliferation and tube formation assays in vitro, and mouse ear and Matrigel plug assays in vivo...
September 14, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28905113/influence-of-increased-heart-rate-and-aortic-pressure-on-resting-indices-of-functional-coronary-stenosis-severity
#17
Lorena Casadonte, Bart-Jan Verhoeff, Jan J Piek, Ed VanBavel, Jos A E Spaan, Maria Siebes
Baseline assessment of functional stenosis severity has been proposed as a practical alternative to hyperemic indices. However, intact autoregulation mechanisms may affect intracoronary hemodynamics. The aim of this study was to investigate the effect of changes in aortic pressure (Pa) and heart rate (HR) on baseline coronary hemodynamics and functional stenosis assessment. In 15 patients (55 ± 3% diameter stenosis) Pa, intracoronary pressure (Pd) and flow velocity were obtained at control, and during atrial pacing at 120 bpm, increased Pa (+30 mmHg) with intravenous phenylephrine (PE), and elevated Pa while pacing at sinus heart rate (PE + sHR)...
September 13, 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28904428/collapsing-glomerulopathy-a-troublemaker-for-the-renal-allograft-lessons-learnt
#18
K V Kanodia, A V Vanikar, L K Nigam, R D Patel, K S Suthar, H V Patel, H L Trivedi
Collapsing glomerulopathy (CG) is a well-recognized distinct morphological pattern of proliferative parenchymal injury leading to rapid graft failure. We conducted a single-center retrospective study to evaluate the prevalence, clinicopathological features, and prognosis of CG in renal transplant recepient. We analyzed 2518 renal allograft biopsies performed from 2007 to 2015 and correlated their clinicopathological features. The prevalence of CG was 0.83% (21 out of 2518) of allograft biopsies with a higher prevalence of 1...
September 2017: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/28904002/assessing-microvascular-function-in-humans-from-a-chronic-disease-perspective
#19
Alfons J H M Houben, Remy J H Martens, Coen D A Stehouwer
Microvascular dysfunction (MVD) is considered a crucial pathway in the development and progression of cardiometabolic and renal disease and is associated with increased cardiovascular mortality. MVD often coexists with or even precedes macrovascular disease, possibly due to shared mechanisms of vascular damage, such as inflammatory processes and oxidative stress. One of the first events in MVD is endothelial dysfunction. With the use of different physiologic or pharmacologic stimuli, endothelium-dependent (micro)vascular reactivity can be studied...
September 13, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28902411/functional-changes-in-the-neural-retina-occur-in-the-absence-of-mitochondrial-dysfunction-in-a-rodent-model-of-diabetic-retinopathy
#20
Dustin R Masser, Laura Otalora, Nicholas W Clark, Michael T Kinter, Michael H Elliott, Willard M Freeman
Diabetic retinopathy is a neurovascular diabetes complication resulting in vision loss. A wealth of literature reports retinal molecular changes indicative of neural deficits, inflammation, and vascular leakage with chronic diabetes, but the mechanistic causes of disease initiation and progression are unknown. Microvascular mitochondrial DNA (mtDNA) damage leading to mitochondrial dysfunction has been proposed to drive vascular dysfunction in retinopathy. However, growing evidence suggests that neural retina dysfunction precedes and may cause vascular damage...
September 13, 2017: Journal of Neurochemistry
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