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Endothelium

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https://www.readbyqxmd.com/read/28231640/mind-the-gap-mechanisms-regulating-the-endothelial-barrier
#1
REVIEW
Mariya Y Radeva, Jens Waschke
The endothelial barrier consists of intercellular contacts localized in the cleft between endothelial cells, which is covered by the glycocalyx in a sieve-like manner. Both types of barrier-forming junctions, i.e. the adherens junction (AJ) serving mechanical anchorage and mechanotransduction and the tight junction (TJ) sealing the intercellular space to limit paracelullar permeability, are tethered to the actin cytoskeleton. Under resting conditions, the endothelium thereby builds a selective layer controlling the exchange of fluid and solutes with the surrounding tissue...
February 23, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28230336/the-endothelial-border-to-health-mechanistic-evidence-of-the-hyperglycemic-culprit-of-inflammatory-disease-acceleration
#2
REVIEW
Nina Waerling Hansen, Anker Jon Hansen, Anette Sams
The endothelial cell (EC) layer constitutes a barrier that controls movements of fluid, solutes and cells between blood and tissue. Further, the endothelial layer regulates vascular tone and directs local humoral and cellular inflammatory processes. The strategic position makes it an important player for maintenance of health and for development of a number of diseases. Endothelial dysfunction is known to be an important component of type 2 diabetes, but is also assumed to be involved in many other diseases, for example, rheumatoid arthritis, inflammatory bowel disease, asthma, and cardiovascular diseases...
March 2017: IUBMB Life
https://www.readbyqxmd.com/read/28229893/safety-and-efficacy-of-natalizumab-in-patients-with-acute-ischaemic-stroke-action-a-randomised-placebo-controlled-double-blind-phase-2-trial
#3
Jacob Elkins, Roland Veltkamp, Joan Montaner, S Claiborne Johnston, Aneesh B Singhal, Kyra Becker, Maarten G Lansberg, Weihua Tang, Ih Chang, Kumar Muralidharan, Sarah Gheuens, Lahar Mehta, Mitchell S V Elkind
BACKGROUND: In animal models of acute ischaemic stroke, blocking of the leukocyte-endothelium adhesion by antagonism of α4 integrin reduces infarct volumes and improves outcomes. We assessed the effect of one dose of natalizumab, an antibody against the leukocyte adhesion molecule α4 integrin, in patients with acute ischaemic stroke. METHODS: In this double-blind, phase 2 study, patients with acute ischaemic stroke (aged 18-85 years) from 30 US and European clinical sites were randomly assigned (1:1) to 300 mg intravenous natalizumab or placebo with stratification by treatment window and baseline infarct size...
March 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28229627/moderate-hypothermia-attenuates-%C3%AE-1-adrenoceptor-mediated-contraction-in-human-varicose-spermatic-vein-the-role-of-nitric-oxide-short-communication
#4
K E Nurullahoglu-Atalik, A Cenker
The effects of moderate hypothermia (28 °C) on the response of human varicose spermatic vein to α1-adrenoceptor agonist phenylephrine and the role of endothelial nitric oxide (NO) in these effects were studied. Concentration-response curves for phenylephrine (10(-9) to 3 × 10(-4) M) were recorded in rings with and without endothelium at 37 and 28 °C. To further analyze the role of NO, in the response to phenylephrine during hypothermia, the effects of this agonist in the presence of N(G)-nitro-L-arginine methyl ester (10(-4) M) were also determined...
December 2016: Physiol Int
https://www.readbyqxmd.com/read/28229321/cerebral-endothelial-dysfunction-in-reversible-cerebral-vasoconstriction-syndrome-a-case-control-study
#5
Hyun Ah Choi, Mi Ji Lee, Chin-Sang Chung
BACKGROUND: The aim of this study is to investigate cerebral endothelial dysfunction in patients with reversible cerebral vasoconstriction syndrome (RCVS). METHODS: We prospectively recruited patients with RCVS, age-matched controls with episodic migraine, and age-matched healthy controls at Samsung Medical Center from Apr 2015 to Jul 2016. All participants underwent transcranial Doppler evaluation, with a breath-holding maneuver, for the evaluation of bilateral middle cerebral arteries (MCAs), posterior cerebral arteries (PCAs), and the basilar artery (BA)...
December 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/28228970/comparison-of-endothelial-function-improvement-estimated-with-reactive-hyperemia-index-between-ramipril-and-telmisartan-in-hypertensive-patients
#6
You-Jeong Ki, Jae-Bin Seo, Hack-Lyoung Kim, Woo-Hyun Lim, Hye Yeon Seo, Jin Yong Lee, Woo-Young Chung
BACKGROUND: Endothelium has a function to regulate vascular tone by releasing mediators either vasodilating or vasoconstricting blood vessels. Endothelial dysfunction can be measured conveniently by Reactive Hyperemia Index (RHI) with a peripheral arterial tonometry. Angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin II (AT II) receptor blockers (ARBs) are considered to have beneficial effects on endothelium through inhibition of AT II. This study was performed to compare the effect of ACEIs or ARBs on endothelial function estimated by RHI in hypertensive patients...
2017: Clinical Hypertension
https://www.readbyqxmd.com/read/28228349/identification-of-prdm-genes-in-human-corneal-endothelium
#7
Kostadin Rolev, G O'Donovan Dominic, Christiana Georgiou, Rajan Madhavan, Alexandra Chittka
Corneal endothelial cells (CECs) are essential for maintaining corneal stromal hydration and ensuring its transparency, which is necessary for normal vision. Dysfunction of CECs leads to stromal decompensation, loss of transparency and corneal blindness. Corneal endothelium has low proliferative potential compared to surface epithelial cells leading to poor regeneration of CEC following injury or age related decline in cellular density. The mechanisms which control proliferation and differentiation of neural crest derived CEC progenitors are yet to be clearly elucidated...
February 19, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28228072/curcumin-and-endothelial-function-evidence-and-mechanisms-of-protective-effects
#8
Maryam Saberi Karimian, Matteo Pirro, Thomas P Johnston, Muhammed Majeed, Amirhossein Sahebkar
BACKGROUND: The endothelium is a large paracrine organ regulating cell growth, vascular tone and thrombogenicity as well as platelet and leukocyte interactions. Endothelial function can be assessed by non-invasive techniques [e.g. flow-mediated vasodilation, nitroglycerin-mediated dilation and pulse wave velocity] and measuring specific circulating biomarkers [cell adhesion molecules, endothelial microparticles and endothelial progenitor cells]. Impaired endothelial function plays a key role in the development of atherosclerosis, arterial hypertension, heart failure, ischemia-reperfusion injury, Alzheimer's disease and other conditions...
February 22, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28226740/automated-morphometric-description-of-human-corneal-endothelium-from-in-vivo-specular-and-confocal-microscopy
#9
F Scarpa, A Ruggeri, F Scarpa, A Ruggeri, A Ruggeri, F Scarpa
Corneal images acquired by in-vivo specular and confocal microscopy provide clinical information on the cornea endothelium health state. Indeed, the normal hexagonal shape of endothelial cells is usually affected by age and pathologies. At present, the analysis is based on manual or semi-automatic methods and the segmentation of a large number of endothelial cells is required for a meaningful estimation of the clinical parameters. We propose an automated method that detects the centers of endothelial cells by convolving the original image with customized two-dimensional kernels, derives a structure made by connected vertices from the recognized centers using the Euclidean distance, and fine-tunes the derived structure through a genetic algorithm, which combines information about the typical regularity of endothelial cells shape with the pixels intensity of the actual image...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226454/optimization-of-electrospun-fibrous-membranes-for-in-vitro-modeling-of-blood-brain-barrier
#10
V Pensabene, S W Crowder, D A Balikov, J B Lee, H J Sung, V Pensabene, S W Crowder, D A Balikov, J B Lee, H J Sung, V Pensabene, D A Balikov, S W Crowder, J B Lee, H J Sung
The blood-brain barrier (BBB) plays a critical role in brain homeostasis at the cellular and global level. Mimicking the selective permeability and transport properties of the BBB to specific molecules and cells remains a significant challenge towards the development of a physiologically relevant in vitro BBB model. In this study, we developed electrospun poly (ε-caprolactone) (PCL) and polyethylene glycol (PEG) copolymer membranes that supported different cellular components of the neurovascular unit including human-derived endothelial cells, pericytes and astrocytes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226338/opioids-inhibit-angiogenesis-in-a-chorioallantoic-membrane-model
#11
Haktan Karaman, Adnan Tufek, Evren Karaman, Orhan Tokgoz
BACKGROUND: Angiogenesis is an important characteristic of cancer. Switching from the avascular phase to the vascular phase is a necessary process for tumor growth. Therefore, research in cancer treatment has focused on angiogenesis as a drug target. Despite the widespread use of opioids to treat pain in patients with cancer, little is known about the effect of these drugs on vascular endothelium and angiogenesis. OBJECTIVES: We aimed to investigate the efficacies of morphine, codeine, and tramadol in 3 different concentrations on angiogenesis in hens' eggs...
February 2017: Pain Physician
https://www.readbyqxmd.com/read/28225916/expression-profiles-of-enos-inos-and-microrna-27b-in-the-corpus-cavernosum-of-rats-submitted-to-chronic-alcoholism-and-diabetes-mellitus
#12
Joao Paulo da Cunha, Fermino Sanches Lizarte, Paulo Cezar Novais, Daniela Gattas, Camila Albuquerque Mello de Carvalho, Daniela Pretti da Cunha Tirapelli, Carlos Augusto Fernandes Molina, Luis Fernando Tirapelli, Silvio Tucci
Purpose: To evaluate the expression of endothelial and inducible NOS in addition to the miRNA-27b in the corpus cavernosum and peripheral blood of healthy rats, diabetic rats, alcoholic rats and rats with both pathologies. Methods: Forty eight Wistar rats were divided into four groups: control (C), alcoholic (A), diabetic (D) and alcoholic-diabetic (AD). Samples of the corpus cavernosum were prepared to study protein expressions of eNOS and iNOS by immunohistochemistry and expression of miRNA-27b in the corpus cavernosum and peripheral blood...
January 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28223818/an-evidence-based-review-on-urate-lowering-treatments-implications-for-optimal-treatment-of-chronic-hyperuricemia
#13
REVIEW
Marilisa Bove, Arrigo Francesco Giuseppe Cicero, Maddalena Veronesi, Claudio Borghi
Several studies suggest that chronic hyperuricemia, the main precursor of gout, is involved in the pathogenesis of different systemic disorders that affect cardiovascular and renal systems, such as hypertension, obesity, hypercholesterolemia, atherosclerosis, metabolic syndrome, chronic heart failure, and chronic kidney disease. Recent epidemiological evidence has shown an increasing trend in the prevalence of hyperuricemia and gout in the Western world: a number of population-based studies estimate a prevalence of up to 21% for hyperuricemia and 1%-4% for gout...
2017: Vascular Health and Risk Management
https://www.readbyqxmd.com/read/28223405/stromal-cell-niches-in-the-inflamed-central-nervous-system
#14
REVIEW
Natalia B Pikor, Jovana Cupovic, Lucas Onder, Jennifer L Gommerman, Burkhard Ludewig
Inflammation in the CNS must be tightly regulated to respond efficiently to infection with neurotropic pathogens. Access of immune cells to the CNS and their positioning within the tissue are controlled by stromal cells that construct the barriers of the CNS. Although the role of the endothelium in regulating the passage of leukocytes and small molecules into the CNS has been studied extensively, the contribution of fibroblastic stromal cells as portals of entry into the CNS was only recently uncovered. We review the critical immune-stimulating role of meningeal fibroblasts in promoting recruitment and retention of lymphocytes during CNS inflammation...
March 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28223280/endothelial-cd99-supports-arrest-of-mouse-neutrophils-in-venules-and-binds-to-neutrophil-pilrs
#15
Debashree Goswami, Sigrid März, Yu-Tung Li, Annette Artz, Kerstin Schäfer, Ruth Seelige, Mariana Pacheco-Blanco, Ding Jing, Maria Gabriele Bixel, Masatake Araki, Kimi Araki, Kenichi Yamamura, Dietmar Vestweber
CD99 is a crucial regulator of the transmigration (diapedesis) of leukocytes through the blood vessel wall. Here, we report that CD99 acts at two different steps in the extravasation process. In agreement with previous antibody blocking experiments, we found that CD99 gene inactivation caused neutrophil accumulation between venular endothelial cells and the basement membrane in the inflamed cremaster. Unexpectedly, we additionally found that leukocyte attachment to the luminal surface of the venular endothelium was impaired in the absence of CD99...
February 21, 2017: Blood
https://www.readbyqxmd.com/read/28223275/vascular-cxcr4-expression-promotes-vessel-sprouting-and-sensitivity-to-sorafenib-treatment-in-hepatocellular-carcinoma
#16
Jing Xu, Jing Liang, Ya-Ming Meng, Jing Yan, Xin-Juan Yu, Chao-Qun Liu, Li Xu, Shi-Mei Zhuang, Limin Zheng
PURPOSE: Chemokine receptor CXCR4 is known to be involved in both developmental and adult angiogenesis; however, its role in tumor angiogenesis remains largely unknown. Here the role of vascular CXCR4 in regulating vascular structure in HCC was assessed and the clinical value of CXCR4 was explored. EXPERIMENTAL DESIGN: The expression of CXCR4 in hepatocellular carcinoma (HCC) was determined by immunohistochemistry and immunofluorescence. Characteristics of CXCR4+ cells were determined by in vitro and mice experiments...
February 21, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28223224/transient-receptor-potential-canonical-type-3-channels-interactions-role-and-relevance-a-vascular-focus
#17
REVIEW
T Hilton Grayson, Timothy V Murphy, Shaun L Sandow
Transient receptor potential canonical type 3 channels (TRPC3) are expressed in neural, cardiac, respiratory and vascular tissues, with both similarities and differences between human and animal models for the same cell types. In common with all members of the six subfamilies of TRP channels, TRPC3 are non-voltage gated, non-selective cation channels that are mainly permeated by Ca(2+), and have distinct molecular, biophysical, anatomical and functional properties. TRP channels are present in excitable and non-excitable cells where they sense and respond to a wide variety of physical and chemical stimuli...
February 13, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28223151/testosterone-rapidly-increases-ca-2-activated-k-currents-causing-hyperpolarization-in-human-coronary-artery-endothelial-cells
#18
Katesirin Ruamyod, Wattana B Watanapa, Chairat Shayakul
Testosterone has endothelium-dependent vasodilatory effects on the coronary artery, with some reports suggesting endothelial ion channel involvement. This study employed the whole-cell patch clamp technique to investigate the effect of testosterone on ion channels in human coronary artery endothelial cells (HCAECs) and the mechanisms involved. We found that 0.03-3μM testosterone significantly induced a rapid, concentration-dependent increase in total HCAEC current (EC50, 71.96±1.66nM; maximum increase, 59...
February 18, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28222365/the-cessation-of-the-long-term-exposure-to-low-doses-of-mercury-ameliorates-the-increase-in-systolic-blood-pressure-and-vascular-damage-in-rats
#19
Danize Aparecida Rizzetti, João Guilherme Dini Torres, Alyne Goulart Escobar, Taiz Martins da Silva, Paola Zambelli Moraes, Raquel Hernanz, Franck Maciel Peçanha, Marta Miguel Castro, Dalton Valentim Vassallo, Mercedes Salaices, Maria Jesús Alonso, Giulia Alessandra Wiggers
This study aimed to verify whether a prolonged exposure to low-level mercury promotes haemodynamic disorders and studied the reversibility of this vascular damage. Rats were divided into seven groups: three control groups received saline solution (im) for 30, 60 or 90 days; two groups received HgCl2 (im, first dose, 4.6μg/kg, subsequent doses 0.07μg/kg/day) for 30 or 60 days; two groups received HgCl2 for 30 or 60 days (im, same doses) followed by a 30-day washout period. Systolic blood pressure (SBP) was measured, along with analysis of vascular response to acetylcholine (ACh) and phenylephrine (Phe) in the absence and presence of endothelium, a nitric oxide (NO) synthase inhibitor, an NADPH oxidase inhibitor, superoxide dismutase, a non-selective cyclooxygenase (COX) inhibitor and an AT1 receptor blocker...
February 18, 2017: Environmental Research
https://www.readbyqxmd.com/read/28220030/novel-paradigms-of-salt-and-hypertension
#20
Wenguang Feng, Louis J Dell'Italia, Paul W Sanders
Salt resistance/sensitivity refers specifically to the effect of dietary sodium chloride (salt) intake on BP. Increased dietary salt intake promotes an early and uniform expansion of extracellular fluid volume and increased cardiac output. To compensate for these hemodynamic changes and maintain constant BP in salt resistance, renal and peripheral vascular resistance falls and is associated with an increase in production of nitric oxide. In contrast, the decline in peripheral vascular resistance and the increase in nitric oxide are impaired or absent in salt sensitivity, promoting an increase in BP in these individuals...
February 20, 2017: Journal of the American Society of Nephrology: JASN
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