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endothelial glycocalyx

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https://www.readbyqxmd.com/read/28930945/effects-of-propranolol-and-clonidine-on-brain-edema-blood-brain-barrier-permeability-and-endothelial-glycocalyx-disruption-following-fluid-percussion-brain-injury-in-the-rat
#1
Gustav Folmer Genét, Peter Bentzer, Morten Bagge Hansen, Sisse Rye Ostrowski, Pär Ingemar Johansson
BACKGROUND: Traumatic brain injury causes a disruption of the vascular endothelial glycocalyx layer that is associated with an overactivation of the sympathoadrenal system. We hypothesized that early and unselective beta-blockade with propranolol alone or in combination with the alfa2-agonist clonidine would decrease brain edema, blood-brain-barrier permeability and glycocalyx disruption at 24 hours after trauma. METHODS: We subjected fifty-three adult male Sprague-Dawley rats to lateral fluid-percussion brain injury and randomized infusion with propranolol (n=16), propranolol+clonidine (n=16), vehicle (n=16) or sham (n=5) for 24 hours...
September 20, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28919014/regulation-and-function-of-endothelial-glycocalyx-layer-in-vascular-diseases
#2
REVIEW
Irina Sieve, Anja Münster-Kühnel, Denise Hilfiker-Kleiner
In the vascular system, the endothelial surface layer (ESL) as the inner surface of blood vessels affects mechanotransduction, vascular permeability, rheology, thrombogenesis, and leukocyte adhesion. It creates barriers between endothelial cells and blood and neighbouring cells. The glycocalyx, composed of glycoconjugates and proteoglycans, is an integral component of the ESL and a key element in inter- and intracellular communication and tissue homeostasis. In pathophysiological conditions (atherosclerosis, infection, ischemia/reperfusion injury, diabetes, trauma and acute lung injury) glycocalyx-degrading factors, i...
September 12, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28916547/automated-measurement-of-microvascular-function-reveals-dysfunction-in-systemic-sclerosis-a-cross-sectional-study
#3
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/28885470/poor-microcirculatory-flow-dynamics-are-associated-with-endothelial-cell-damage-and-glycocalyx-shedding-following-traumatic-hemorrhagic-shock
#4
David N Naumann, Jon Hazeldine, Mark J Midwinter, Sam D Hutchings, Paul Harrison
BACKGROUND: Endothelial cell damage and glycocalyx shedding following trauma can increase the risk of inflammation, coagulopathy, vascular permeability and death. Bedside sublingual video-microscopy may detect worse flow and perfusion associated with this endotheliopathy. We compared markers of endotheliopathy with physical flow dynamics following traumatic hemorrhagic shock (THS). METHODS: Sublingual incident dark field video-microscopy was performed at three time-points following injury (<10h; 10-30h; and 30-50h)...
September 5, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28851407/restricted-fluid-resuscitation-in-sepsis-associated-hypotension-refresh-study-protocol-for-a-pilot-randomised-controlled-trial
#5
Stephen P J Macdonald, David McD Taylor, Gerben Keijzers, Glenn Arendts, Daniel M Fatovich, Frances B Kinnear, Simon G A Brown, Rinaldo Bellomo, Sally Burrows, John F Fraser, Edward Litton, Juan Carlos Ascencio-Lane, Matthew Anstey, David McCutcheon, Lisa Smart, Ioana Vlad, James Winearls, Bradley Wibrow
BACKGROUND: Guidelines recommend an initial intravenous (IV) fluid bolus of 30 ml/kg isotonic crystalloid for patients with sepsis and hypotension. However, there is a lack of evidence from clinical trials to support this. Accumulating observational data suggest harm associated with the injudicious use of fluids in sepsis. There is currently equipoise regarding liberal or restricted fluid-volume resuscitation as first-line treatment for sepsis-related hypotension. A randomised trial comparing these two approaches is, therefore, justified...
August 29, 2017: Trials
https://www.readbyqxmd.com/read/28846193/the-endothelial-glycocalyx-in-health-and-kidney-disease-rising-star-or-false-dawn
#6
REVIEW
Hui Liew, Matthew A Roberts, Robert MacGinley, Lawrence P McMahon
The endothelial glycocalyx is a layer comprised of proteins and carbohydrates on the luminal surface of vascular endothelial cells, thought to have an important role in the health and function of the endothelium. Disrupted by various pathophysiological conditions and linked with clinical outcomes, it is increasingly recognised as an early indicator of endothelial injury and a potential marker of vascular injury. In this review, we discuss current methods of assessment (including novel optical approaches), evidence for its use as a marker of vascular disease and its potential role in relation to microalbuminuria and glomerular endothelial dysfunction...
August 28, 2017: Nephrology
https://www.readbyqxmd.com/read/28837800/systemic-monocyte-chemotactic-protein-1-inhibition-modifies-renal-macrophages-and-restores-glomerular-endothelial-glycocalyx-and-barrier-function-in-diabetic-nephropathy
#7
Margien G S Boels, Angela Koudijs, M Cristina Avramut, Wendy M P J Sol, Gangqi Wang, Annemarie M van Oeveren-Rietdijk, Anton Jan van Zonneveld, Hetty C de Boer, Johan van der Vlag, Cees van Kooten, Dirk Eulberg, Bernard M van den Berg, Daphne H T IJpelaar, Ton J Rabelink
Inhibition of monocyte chemotactic protein-1 (MCP)-1 with the Spiegelmer emapticap pegol (NOX-E36) shows long-lasting albuminuria-reducing effects in diabetic nephropathy. MCP-1 regulates inflammatory cell recruitment and differentiation of macrophages. Since the endothelial glycocalyx is also reduced in diabetic nephropathy, we hypothesized that MCP-1 inhibition restores glomerular barrier function through influencing macrophage cathepsin L secretion, thus reducing activation of the glycocalyx degrading enzyme heparanase...
August 21, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28830365/minimal-shedding-of-the-glycocalyx-layer-during-abdominal-hysterectomy
#8
Janis Nemme, Robert G Hahn, Camilla Krizhanovskii, Stelia Ntika, Olegs Sabelnikovs, Indulis Vanags
BACKGROUND: Surgery with and without hypervolaemia may cause shedding (breakdown) of the endothelial glycocalyx layer, but the severity of this problem is unclear. METHODS: In this preliminary report of a larger clinical trial, the plasma and urine concentrations of three biomarkers of glycocalyx shedding (syndecan-1, hyaluronic acid and heparan sulfate) were measured in seven patients before, during, and after open hysterectomy. The fluid therapy consisted of 25 ml/kg (approximately 2 l) of Ringer's lactate, which was infused over 30 min when the surgery started...
August 22, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28829810/extracellular-overhydration-linked-with-endothelial-dysfunction-in-the-context-of-inflammation-in-haemodialysis-dependent-chronic-kidney-disease
#9
Nicos Mitsides, Tom Cornelis, Natascha J H Broers, Nanda M P Diederen, Paul Brenchley, Frank M van der Sande, Casper G Schalkwijk, Jeroen P Kooman, Sandip Mitra
BACKGROUND: Haemodialysis (HD) patients are predisposed to dysregulated fluid balance leading to extracellular water (ECW) expansion. Fluid overload has been closely linked with outcome in these patients. This has mainly been attributed to cardiac volume overload, but the relation between abnormalities in fluid status with micro- and macrovascular dysfunction has not been studied in detail. We studied the interaction of macro- and microvascular factors in states of normal and over- hydration in HD-dependent CKD...
2017: PloS One
https://www.readbyqxmd.com/read/28822340/endothelial-glycocalyx-biomarkers-increase-in-patients-with-infection-during-emergency-department-treatment
#10
Lisa Smart, Stephen P J Macdonald, Sally Burrows, Erika Bosio, Glenn Arendts, Daniel M Fatovich
PURPOSE: Endothelial glycocalyx (EG) shedding may promote organ failure in sepsis. This study describes temporal changes in EG biomarkers from Emergency Department (ED) arrival, and associations with clinical characteristics. MATERIALS AND METHODS: This prospective observational study included 23 patients with simple infection, 86 with sepsis and 29 healthy controls. Serum EG biomarkers included syndecan-1, syndecan-4 and hyaluronan. Samples were taken on enrolment in the ED (T0), 1 hour (T1), 3 hours (T3) and 12 to 24 hours (T24) later...
July 2, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28808796/structural-alteration-of-the-endothelial-glycocalyx-contribution-of-the-actin-cytoskeleton
#11
Weiqi Li, Wen Wang
The endothelial glycocalyx is a carbohydrate-protein layer that lines the luminal surface of the endothelium. It anchors to the cell membrane via its core proteins that share extended link to the actin cytoskeleton. It is widely accepted that those protein domains and the attached carbohydrates are susceptible to pathological changes. It is unclear, however, to what extent the actin cytoskeleton contributes to the glycocalyx stability. In this study, we investigate the role of the actin cytoskeleton in the maintenance of the glycocalyx under static and laminar flow conditions in vitro...
August 14, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28744857/the-effect-of-pre-operative-methylprednisolone-on-early-endothelial-damage-after-total-knee-arthroplasty-a-randomised-double-blind-placebo-controlled-trial
#12
V Lindberg-Larsen, S R Ostrowski, M Lindberg-Larsen, M L Rovsing, P I Johansson, H Kehlet
We wished to evaluate whether inhibition of the systemic inflammatory response by a single pre-operative dose of methylprednisolone reduced markers of early endothelial damage after fast-track total knee arthroplasty. We randomly allocated 70 patients undergoing elective unilateral total knee arthroplasty (1:1) to receive either pre-operative intravenous methylprednisolone 125 mg (methylprednisolone group) or isotonic saline (control group). All procedures were performed under spinal anaesthesia without a tourniquet, using a standardised multimodal analgesic regime...
July 26, 2017: Anaesthesia
https://www.readbyqxmd.com/read/28733074/non-invasive-assessment-of-microvascular-dysfunction-in-patients-with-microvascular-angina
#13
Caroline Jaarsma, Hans Vink, Judith van Haare, Sebastiaan C A M Bekkers, Bart D van Rooijen, Walter H Backes, Joachim E Wildberger, Harry J Crijns, Jurgen van Teeffelen, Simon Schalla
BACKGROUND: We aimed to evaluate the microvascular function in patients with microvascular angina (MVA) by assessing 1) the endothelial glycocalyx barrier properties using sublingual microscopy, and 2) the myocardial perfusion reserve using cardiovascular magnetic resonance (CMR) imaging. METHODS: Sublingual microscopy was performed in 13 MVA patients (angina pectoris, ST-depression on treadmill testing, normal coronary angiogram) and compared with 2 control groups of 13 volunteers and 14 patients with known obstructive coronary artery disease (CAD)...
July 18, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28732591/diabetic-retinopathy-breaking-the-barrier
#14
REVIEW
Randa S Eshaq, Alaa M Z Aldalati, J Steven Alexander, Norman R Harris
Diabetic retinopathy (DR) remains a major complication of diabetes and a leading cause of blindness among adults worldwide. DR is a progressive disease affecting both type I and type II diabetic patients at any stage of the disease, and targets the retinal microvasculature. DR results from multiple biochemical, molecular and pathophysiological changes to the retinal vasculature, which affect both microcirculatory functions and ultimately photoreceptor function. Several neural, endothelial, and support cell (e...
July 12, 2017: Pathophysiology: the Official Journal of the International Society for Pathophysiology
https://www.readbyqxmd.com/read/28700908/endothelial-glycocalyx-mediated-nitric-oxide-production-in-response-to-selective-afm-pulling
#15
Anne Marie W Bartosch, Rick Mathews, John M Tarbell
Nitric oxide (NO) is a regulatory molecule in the vascular system and its inhibition due to endothelial injury contributes to cardiovascular disease. The glycocalyx is a thin layer of glycolipids, glycoproteins, and proteoglycans on the surface of mammalian epithelial cells. Extracellular forces are transmitted through the glycocalyx to initiate intracellular signaling pathways. In endothelial cells (ECs), previous studies have shown the glycocalyx to be a significant mediator of NO production; degradation of the endothelial glycocalyx layer (EGL) drastically reduces EC production of NO in response to fluid shear stress...
July 11, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28694125/a-fully-analytical-approach-to-investigate-the-electro-viscous-effect-of-the-endothelial-glycocalyx-layer-on-the-microvascular-blood-flow
#16
Arezoo Khosravi, Hadi Asgharzadeh Shirazi, Alireza Asnafi, Alireza Karimi
BACKGROUND: Recently, the glycocalyx lining the endothelial surface has emerged as a structure of fundamental importance to a wide range of phenomena that has undeniable effect on cardiovascular health and disease. With respect to the blood flow in small vessels, it has been experimentally reported that the glycocalyx layer causes additional resistance to the flow. METHODS: The hypothesis of glycocalyx resistance against the blood flow, considered as two-phase layer fluid through a small blood vessel, was theoretically evaluated...
July 8, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28685678/glomerular-endothelium-and-its-impact-on-glomerular-filtration-barrier-in-diabetes-are-the-gaps-still-illusive
#17
Joseph Fomusi Ndisang
BACKGROUND: Glomerular capillaries are lined with highly specialized fenestrated endothelium which are primarily responsible to regulate high flux filtration of fluid and small solutes. During filtration, plasma passes through the fenestrated endothelium and basement membrane before it reaches the slit diaphragm, a specialized type of intercellular junction that connects neighbouring podocytes. METHODS: A PubMed search was done for recent articles on components of the glomerular filtration barrier such as glomerular endothelial cells, podocytes and glomerular basement membrane, and the effect of diabetes on these structures...
July 5, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28673582/endothelial-dysfunction-mediated-by-interleukin-18-in-patients-with-ischemic-heart-disease-undergoing-coronary-artery-bypass-grafting-surgery
#18
Sokolic Jadranko, Vlatka Sotosek Tokmadzic, Knezevic Danijel, Medved Igor, Vukelic Damjani Nada, Balen Sanja, Rakic Marijana, Lanca Bastiancic Ana, Laskarin Gordana
When medication management or percutaneous coronary intervention is not successful in patients with advanced ischemic heart disease, surgical revascularisation-predominantly coronary artery bypass grafting (CABG)-is considered the gold standard. However, CABG surgery can lead to ischemia/reperfusion injury, which is characterized by a strong inflammatory response. Interleukin (IL)-18, is a strong inflammatory mediator, that is released from cardiomyocytes and can be found in the systemic circulation of patients during and immediately after CABG surgery...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28667310/surface-modification-of-pig-endothelial-cells-with-a-branched-heparin-conjugate-improves-their-compatibility-with-human-blood
#19
Anjan K Bongoni, Evelyn Salvaris, Sofia Nordling, Nikolai Klymiuk, Eckhard Wolf, David L Ayares, Robert Rieben, Peetra U Magnusson, Peter J Cowan
Corline Heparin Conjugate (CHC), a compound of multiple unfractionated heparin chains, coats cells with a glycocalyx-like layer and may inhibit (xeno)transplant-associated activation of the plasma cascade systems. Here, we investigated the use of CHC to protect WT and genetically modified (GTKO.hCD46.hTBM) pig aortic endothelial cells (PAEC) in two pig-to-human in vitro xenotransplantation settings. Model 1: incubation of untreated or hTNFα-treated PAEC with 10% human plasma induced complement C3b/c and C5b-9 deposition, cellular activation and coagulation activation in WT and GTKO...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28659919/the-%C3%AE-d-endoglucuronidase-heparanase-is-a-danger-molecule-that-drives-systemic-inflammation-and-correlates-with-clinical-course-after-open-and-endovascular-thoracoabdominal-aortic-aneurysm-repair-lessons-learnt-from-mice-and-men
#20
Lukas Martin, Alexander Gombert, Jianmin Chen, Julia Liebens, Julia Verleger, Johannes Kalder, Gernot Marx, Michael Jacobs, Christoph Thiemermann, Tobias Schuerholz
Thoracoabdominal aortic aneurysm (TAAA) is a highly lethal disorder requiring open or endovascular TAAA repair, both of which are rare, but extensive and complex surgical procedures associated with a significant systemic inflammatory response and high post-operative morbidity and mortality. Heparanase is a β-d-endoglucuronidase that remodels the endothelial glycocalyx by degrading heparan sulfate in many diseases/conditions associated with systemic inflammation including sepsis, trauma, and major surgery. We hypothesized that (a) perioperative serum levels of heparanase and heparan sulfate are associated with the clinical course after open or endovascular TAAA repair and (b) induce a systemic inflammatory response and renal injury/dysfunction in mice...
2017: Frontiers in Immunology
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