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https://www.readbyqxmd.com/read/27889956/red-blood-cell-function-and-dysfunction-redox-regulation-nitric-oxide-metabolism-anemia
#1
Viktoria Kuhn, Lukas Diederich, T C Stevenson Keller Iv, Christian M Kramer, Wiebke Lückstädt, Christina Panknin, Tatsiana Suvorava, Brant Isakson, Malte Kelm, Miriam Margherita Cortese-Krott
SIGNIFICANCE: Recent clinical evidence identified anemia to be correlated with severe complications of cardiovascular disease such as bleeding, thromboembolic events, stroke, hypertension, arrhythmias, as well as inflammation, particularly in elderly patients. The underlying mechanisms of these complications are largely unidentified. Recent Advances: Previously, red blood cells (RBCs) were considered exclusively as transporters of oxygen and nutrients to the tissues. More recent experimental evidence indicates that RBCs are important inter-organ communication systems with additional functions, including participation in control of systemic NO metabolism, redox regulation, blood rheology and viscosity...
November 27, 2016: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/27889474/the-von-willebrand-factor-a1-collagen-iii-interaction-is-independent-of-conformation-and-type-2-von-willebrand-disease-phenotype
#2
Venkata R Machha, Alexander Tischer, Laurie Moon-Tasson, Matthew Auton
The blood von Willebrand factor (VWF) mediates platelet adhesion to injured vessels by sequestering platelets from blood flow and depositing them to collagen and other exposed subendothelial matrix proteins. This process of capturing platelets to facilitate formation of platelet plugs occurs through transient interactions with platelet glycoprotein Ibα via the VWF A1 domain which also binds collagen. Using a conformationally diverse collection of natively folded and mutation-induced misfolded von Willebrand Disease (VWD) variants, we test a recently proposed affinity up-regulation hypothesis which states that collagen binding changes the conformation of the A1 domain to a high affinity GPIbα binding competent state...
November 23, 2016: Journal of Molecular Biology
https://www.readbyqxmd.com/read/27889443/the-application-of-silicon-sol-gel-technology-to-forensic-blood-substitute-development-mimicking-aspects-of-whole-human-blood-rheology
#3
Theresa Stotesbury, Mike Illes, Paul Wilson, Andrew J Vreugdenhil
Solution-gelation chemistry has promising applications in forensic synthetic blood substitute development. This research offers a silicon-based sol-gel approach to creating stable materials that share similar rheological properties to that of whole human blood samples. Room temperature, high water content, silicon sol-gels were created using the organosilane precursors 3-glycidoxypropyltrimethoxysilane and tetraethylorthosilicate along with various concentrations of filler and pigment. Shear-thinning non-Newtonian properties were observed within most formulations of the presented materials...
November 15, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27878206/new-findings-on-venous-thrombogenesis
#4
James R Byrnes, Alisa S Wolberg
Venous thrombosis (VT) is the third most common cause of cardiovascular death worldwide. Complications from VT and pulmonary embolism are the leading cause of lost disability-adjusted life years. Risks include genetic (e.g., non-O blood group, activated protein C resistance, hyperprothrombinemia) and acquired (e.g., age, surgery, cancer, pregnancy, immobilisation, female hormone use) factors. Pathophysiologic mechanisms that promote VT are incompletely understood, but involve abnormalities in blood coagulability, vessel function, and flow (so-called Virchow's Triad)...
November 23, 2016: Hämostaseologie
https://www.readbyqxmd.com/read/27872015/self-hardening-and-thermoresponsive-alpha-tricalcium-phosphate-pluronic-pastes
#5
Yassine Maazouz, Edgar B Montufar, Julien Malbert, Montserrat Espanol, Maria-Pau Ginebra
: Although calcium phosphate cements (CPCs) are used for bone regeneration in a wide range of clinical applications, various physicochemical phenomena are known to hinder their potential use in minimally invasive surgery or in highly vascularized surgical sites, mainly because of their lack of injectability or their low washout resistance. The present work shows that the combination of CPCs with an inverse-thermoresponsive hydrogel is a good strategy for finely tuning the cohesive and rheological properties of CPCs to achieve clinical acceptable injectability to prevent phase separation during implantation and cohesion to avoid washout of the paste...
November 18, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27867728/label-free-measurement-of-retinal-blood-cell-flux-velocity-hematocrit-and-capillary-width-in-the-living-mouse-eye
#6
A Guevara-Torres, A Joseph, J B Schallek
Measuring blood cell dynamics within the capillaries of the living eye provides crucial information regarding the health of the microvascular network. To date, the study of single blood cell movement in this network has been obscured by optical aberrations, hindered by weak optical contrast, and often required injection of exogenous fluorescent dyes to perform measurements. Here we present a new strategy to non-invasively image single blood cells in the living mouse eye without contrast agents. Eye aberrations were corrected with an adaptive optics camera coupled with a fast, 15 kHz scanned beam orthogonal to a capillary of interest...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27834220/red-cells-dynamic-morphologies-govern-blood-shear-thinning-under-microcirculatory-flow-conditions
#7
Luca Lanotte, Johannes Mauer, Simon Mendez, Dmitry A Fedosov, Jean-Marc Fromental, Viviana Claveria, Franck Nicoud, Gerhard Gompper, Manouk Abkarian
Blood viscosity decreases with shear stress, a property essential for an efficient perfusion of the vascular tree. Shear thinning is intimately related to the dynamics and mutual interactions of RBCs, the major component of blood. Because of the lack of knowledge about the behavior of RBCs under physiological conditions, the link between RBC dynamics and blood rheology remains unsettled. We performed experiments and simulations in microcirculatory flow conditions of viscosity, shear rates, and volume fractions, and our study reveals rich RBC dynamics that govern shear thinning...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27830156/administration-of-traditional-chinese-blood-circulation-activating-drugs-for-microvascular-complications-in-patients-with-type-2-diabetes-mellitus
#8
REVIEW
Lisha He, Han Wang, Chengjuan Gu, Xinhui He, Linhua Zhao, Xiaolin Tong
Traditional Chinese medicine (TCM) is an important complementary strategy for treating diabetes mellitus (DM) in China. Traditional Chinese blood circulation activating drugs are intended to guide an overall approach to the prevention and treatment of microvascular complications of DM. The core mechanism is related to the protection of the vascular endothelium and the basement membrane. Here, we reviewed the scientific evidence underpinning the use of blood circulation activating drugs to prevent and treat DM-induced microvascular complications, including diabetic nephropathy (DN), diabetic peripheral neuropathy (DPN), and diabetic retinopathy (DR)...
2016: Journal of Diabetes Research
https://www.readbyqxmd.com/read/27814286/microcirculation-and-blood-rheology-abnormalities-in-chronic-heart-failure
#9
Irina Tikhomirova, Elena Petrochenko, Alexei Muravyov, Yulia Malysheva, Alexandr Petrochenko, Vladimir Yakusevich, Anna Oslyakova
No abstract text is available yet for this article.
November 4, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27802209/comparative-study-between-microvascular-tone-regulation-and-rheological-properties-of-blood-in-patients-with-type-2-diabetes-mellitus
#10
N Antonova, K Tsiberkin, S Podtaev, V Paskova, I Velcheva, N Chaushev
The aim of the study is to investigate the changes of the skin blood flow responses to cold stress in patients with diabetes mellitus type 2 through wavelet analysis of the peripheral skin temperature oscillations and to estimate their relationship with the blood viscosity values. The amplitudes of the skin temperature pulsations (ASTP) were monitored by "Microtest" device ("FM-Diagnostics", Russia); the whole blood viscosity and the shear stresses were measured by Contraves LS30 viscometer, (Switzerland) at a steady flow in 9 healthy subjects and in 30 patients with type 2 diabetes mellitus...
October 12, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27792046/ivabradine-attenuates-the-microcirculatory-derangements-evoked-by-experimental-sepsis
#11
Marcos L Miranda, Michelle M Balarini, Daniela S Balthazar, Lorena S Paes, Maria-Carolina S Santos, Eliete Bouskela
BACKGROUND: Experimental data suggest that ivabradine, an inhibitor of the pacemaker current in sinoatrial node, exerts beneficial effects on endothelial cell function, but it is unclear if this drug could prevent microcirculatory dysfunction in septic subjects, improving tissue perfusion and reducing organ failure. Therefore, this study was designed to characterize the microcirculatory effects of ivabradine on a murine model of abdominal sepsis using intravital videomicroscopy. METHODS: Twenty-eight golden Syrian hamsters were allocated in four groups: sham-operated animals, nontreated septic animals, septic animals treated with saline, and septic animals treated with ivabradine (2...
October 28, 2016: Anesthesiology
https://www.readbyqxmd.com/read/27792003/exercise-induced-changes-in-hematocrit-and-hematocrit-viscosity-ratio-in-male-rugby-players
#12
Varlet-Marie Emmanuelle, Brun Jean-Frédéric, Raynaud de Mauverger Eric, Fédou Christine
We investigated whether the concept of hematocrit/viscosity (h/η) ratio explains the "paradox of hematocrit in athletes", by calculating a "theoretical optimal hematocrit" (i.e., associated with the higher h/η value predicted with Quemada's equation from plasma viscosity, and erythrocyte rigidity index) before and after exercise. 14 rugby players (19-31 yr; weight 65.8-109.2 kg; height 1.7-1.96 m; BMI 21.7-33.1 kg/m2) underwent a standardized submaximal exercise session on cycloergometer corresponding to 225 kjoules over 30 min...
October 27, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27792002/segmental-bioelectrical-impedance-analysis-sbia-and-blood-rheology-reducing-the-gap-between-in-vivo-and-in-vitro
#13
Varlet-Marie Emmanuelle, Joré Céline, Brun Jean-Frédéric
Bioelectrical impedancemetry (BIA) has been used to evaluate hematocrit and red cell aggregability in vitro but whole body impedance measurements are also correlated to some hemorheologic factors, suggesting a relationship between viscosity factors and electric properties of blood. We repeatedly reported correlations with whole body BIA and hematocrit, whole blood viscosity and plasma viscosity, red cell rigidity and RBC aggregation. The SBIA Inbody 770 modelizes body as 5 cylinders and measures impedance at 1, 5, 50, 250, 500, and 1000 kHz...
October 27, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27791996/history-and-futur-of-hemorheology-from-reykjavik-to-lisboa
#14
J F Stoltz
The word "Biorheology" was introduced in 1948 during the first international congress on Rheology but "hemorheology" was first employed in 1951 during a meeting of the American Institute of Physics. Basically this science is related to physics and mechanics. The first international conference devoted to hemorheology was organized by AL Copley in Reykjavik (Iceland) in July 1969 and an International Society on Hemorheology was created. But after Reykjavik this society was named "International Society of Biorheology"...
October 27, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27774070/modeling-the-behavior-of-red-blood-cells-within-the-caudal-vein-plexus-of-zebrafish
#15
Tijana R Djukic, Swapna Karthik, Igor Saveljic, Valentin Djonov, Nenad Filipovic
Due to the important biological role of red blood cells (RBCs) in vertebrates, the analysis of reshaping and dynamics of RBCs motion is a critical issue in physiology and biomechanics. In this paper the behavior of RBCs within the immature capillary plexus during embryonic development of zebrafish has been analyzed. Relying on the fact that zebrafish embryos are small and optically transparent, it is possible to image the blood flow. In this way the anatomy of blood vessels is monitored along with the circulation throughout their development...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27773469/lipophilic-index-kidney-function-and-kidney-function-decline
#16
H Xu, J Ärnlöv, B Sandhagen, U Risérus, B Lindholm, L Lind, J J Carrero
BACKGROUND AND AIMS: Unhealthy dietary fats are associated with faster kidney function decline. The cell membrane composition of phospholipid fatty acids (FAs) is a determinant of membrane fluidity and rheological properties. These properties, which have been linked to kidney damage, are thought to be reflected by the lipophilic index (LI). We prospectively investigated the associations of LI with kidney function and its decline. METHODS AND RESULTS: Observational study from the Prospective Investigation of Vasculature in Uppsala Seniors including 975 men and women with plasma phospholipid FAs composition and cystatin-C estimate glomerular filtration rate (eGFR)...
December 2016: Nutrition, Metabolism, and Cardiovascular Diseases: NMCD
https://www.readbyqxmd.com/read/27770520/changes-of-endothelin-1-content-and-blood-rheological-properties-in-crush-syndrome
#17
N Gamkrelidze, N Pavliashvili, R Otarashvili
This study describes hematocrit values and quantitative changes in plasma endothelin-1 (ET-1) levels according to the severity of crush syndrome (CS) compression and decompression periods. The experiments were carried out on 50 randomly selected 200-250 gr mass Wistar rats with the use of the standard crush syndrome modeling method. The plasma level of ET-1 was determined by the immuneenzyme method with the use of ELISA REDEAR URIT 660. Hematocrit was determined using the standard method and measured according to tube column divisions...
September 2016: Georgian Medical News
https://www.readbyqxmd.com/read/27767980/hemorheological-factors-can-be-informative-in-comparing-treatment-possibilities-of%C3%A2-abdominal-compartment-syndrome
#18
Norbert Nemeth, Katalin Peto, Adam Deak, Viktoria Sogor, Gabor Varga, Bence Tanczos, Klaudia Balog, Adrienn Csiszko, Zoltan Godo, Zsolt Szentkereszty
BACKGROUND: Abdominal compartment syndrome (ACS) is a life-threatening condition, of which pathomechanism hasn't been completely clarified, yet. Furthermore, surgical therapy still needs optimization. OBJECTIVE: We aimed to investigate microcirculatory and micro-rheological alterations in ACS, using various temporary abdominal closure methods, including three settings of vacuum-assisted closure technique (negative pressure wound therapy, NPWT). METHODS: On anesthetized pigs, by intraabdominally placed and filled-up silicone bags, intraabdominal pressure at 30 mmHg was maintained for 3 hours, and afterwards, decompressive laparotomy happened...
October 20, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27761512/data-on-the-purification-and-crystallization-of-the-loss-of-function-von-willebrand-disease-variant-p-gly1324ser-of-the-von-willebrand-factor-a1-domain
#19
James C Campbell, Alexander Tischer, Venkata Machha, Laurie Moon-Tasson, Banumathi Sankaran, Choel Kim, Matthew Auton
von Willebrand factor׳s (VWF) primary hemostatic responsibility is to deposit platelets at sites of vascular injury to prevent bleeding. This function is mediated by the interaction between the VWF A1 domain and the constitutively active platelet receptor, GPIbα. The crystal structure of the A1 domain harboring the von Willebrand disease (vWD) type 2M mutation p.Gly1324Ser has been recently published in the Journal of Biological Chemistry describing its effect on the function and structural stability of the A1 domain of VWF, "Mutational constraints on local unfolding inhibit the rheological adaptation of von Willebrand factor" [1]...
June 2016: Data in Brief
https://www.readbyqxmd.com/read/27758696/immune-inflammatory-activation-in-acute-coronary-syndromes-a-look-into-the-heart-of-unstable-coronary-plaque
#20
Giovanni Cimmino, Francesco S Loffredo, Alberto Morello, Saverio D Elia, Raffaele De Palma, Plinio Cirillo, Paolo Golino
In the last twenty years, our comprehension of the molecular mechanisms involved in formation, progression and complication of atherosclerotic plaque has advanced significantly and the main role of inflammation and immunity in this phenomenon is now largely accepted. Accumulating evidence highlight the crucial role of different inflammatory and immune cells, such as monocytes and T-lymphocytes, in the pathophysiology of atherosclerotic lesion, particularly in contributing to its complications, such as rupture or ulceration...
October 13, 2016: Current Cardiology Reviews
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