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erythrocyte deformability

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https://www.readbyqxmd.com/read/28526627/dynamic-fatigue-measurement-of-human-erythrocytes-using-dielectrophoresis
#1
Yuhao Qiang, Jia Liu, E Du
Erythrocytes must undergo severe deformation to pass through narrow capillaries and submicronic splenic slits for several hundred thousand times in their normal lifespan. Studies of erythrocyte biomechanics have been mainly focused on cell deformability and rheology measured from a single application of stress and mostly under a static or quasi-static state using classical biomechanical techniques, such as optical tweezers and micropipette aspiration. Dynamic behavior of erythrocytes in response to cyclic stresses that contributes to the membrane failure in blood circulation is not fully understood...
May 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28524208/microfluidic-analysis-of-red-blood-cell-deformability-as-a-means-to-assess-hemin-induced-oxidative-stress-resulting-from-plasmodium-falciparum-intraerythrocytic-parasitism
#2
Kerryn Matthews, Simon P Duffy, Marie-Eve Myrand-Lapierre, Richard R Ang, Li Li, Mark D Scott, Hongshen Ma
Hemolytic anemia is one of the hallmarks of malaria and leads to an increase in oxidized heme (hemin) within the plasma of infected individuals. While scavenger proteins sequester much of the circulating heme, it has been hypothesized that extracellular heme may play a central role in malaria pathogenesis. We have previously developed the multiplex fluidic plunger (MFP) device for the measurement of red blood cell (RBC) deformability. Here, we demonstrate that the measurement of changes in RBC deformability is a sensitive method for inferring heme-induced oxidative stress...
May 19, 2017: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/28504711/the-stabilizing-effect-of-an-oligomeric-proanthocyanidin-on-red-blood-cell-membrane-structure-of-poorly-controlled-type-ii-diabetes
#3
J Visser, P J van Staden, P Soma, A V Buys, E Pretorius
Type II diabetes (T2D) is a pandemic characterized by pathological circulating inflammatory markers, high-glucose levels and oxidative stress. The hematological system is especially vulnerable to these aberrant circulating molecules, and erythrocytes (RBCs) show aberrant rheology properties, owing to the direct contact with these molecules. Pathological levels of circulating inflammatory markers in T2D therefore have a direct effect on the molecular and cellular structure of RBCs. Previous research has suggested that antioxidants may reduce oxidative stress that results from the pathological inflammatory markers...
May 15, 2017: Nutrition & Diabetes
https://www.readbyqxmd.com/read/28488957/cumulative-erythrocyte-damage-in-blood-storage-and-relevance-to-massive-transfusions-selective-insights-into-serial-morphological-and-biochemical-findings
#4
REVIEW
Jeffrey S Putter, Jerard Seghatchian
Elucidating the precise mechanisms of cumulative red cell damages during storage and the potential harmful consequences after transfusion are achievable by exacting laboratory science and well-defined clinical studies in progress. Accordingly, for larger magnitude blood transfusions (i.e. 8-12 U in 24 hours), the quality of the stored blood and its characterisation are of special academic and clinical importance. Our main objectives in this review are to illuminate facets of the red cell storage lesion for prolonged storage (0-42 days) by concentrating on various hallmarks of the disorder: 1) identifying and characterising serial markers of the progressive lesion with respect to red cell dysmorphology, deformability, haemolytic fragility and dysfunction both in storage and the microcirculation; and 2) relevant biochemical findings of redox status correlated to oxidative stress of erythrocyte proteins...
April 10, 2017: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/28478838/heterogeneity-of-hypoxia-in-solid-tumours-and-mechanochemical-reactions-with-oxygen-nanobubbles
#5
V B Orel, M A Zabolotny, V E Orel
Tumour hypoxia leads to radio and chemotherapy resistance among cancer patients. The aim of this paper is to formulate a hypothesis on the heterogeneity of hypoxia in solid tumours. Tumour vasculature is known to be significantly variable. The great structural and functional abnormalities of tumour microcirculation cause spatial and temporal heterogeneity in its perfusion. Tumours have constantly been under the influence of pulsatile blood perfusion with variable pressure that initiates inhomogeneous erythrocyte deformation and following impact on oxygen disorder release from red blood cells into plasma within the blood vessel...
May 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28472705/measurements-of-red-cell-deformability-and-hydration-reflect-hbf-and-hba2-in-blood-from-patients-with-sickle-cell-anemia
#6
Nermi L Parrow, Hongbin Tu, James Nichols, Pierre-Christian Violet, Corinne A Pittman, Courtney Fitzhugh, Robert E Fleming, Narla Mohandas, John F Tisdale, Mark Levine
Decreased erythrocyte deformability, as measured by ektacytometry, may be associated with disease severity in sickle cell anemia (SCA). Heterogeneous populations of rigid and deformable cells in SCA blood result in distortions of diffraction pattern measurements that correlate with the concentration of hemoglobin S (HbS) and the percentage of irreversibly sickled cells. We hypothesize that red cell heterogeneity, as well as deformability, will also be influenced by the concentration of alternative hemoglobins such as fetal hemoglobin (HbF) and the adult variant, HbA2...
April 18, 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28458720/role-of-red-blood-cells-in-haemostasis-and-thrombosis
#7
Rustem I Litvinov, John W Weisel
In contrast to an obsolete notion that erythrocytes, or red blood cells (RBCs), play a passive and minor role in hemostasis and thrombosis, over the past decades there has been increasing evidence that RBCs have biologically and clinically important functions in blood clotting and its disorders. This review summarizes the main mechanisms that underlie the involvement of RBCs in hemostasis and thrombosis in vivo, such as rheological effects on blood viscosity and platelet margination, aggregation and deformability of RBCs; direct adhesion and indirect biochemical interactions with endothelial cells and platelets, etc...
February 2017: ISBT Science Series
https://www.readbyqxmd.com/read/28433719/isolation-and-characterization-of-monocyte-macrophage-from-peripheral-blood-of-half-smooth-tongue-sole-cynoglossus-semilaevis
#8
Zhenxia Sha, Linqing Wang, Luming Sun, Yadong Chen, Yuan Zheng, Mei Xin, Chen Li, Songlin Chen
In the present study, the peripheral blood cells of half smooth tongue sole (Cynoglossus semilaevis) were examined by blood smear under the light microscopy. The proportion of main types of blood cells are as following: erythrocyte occupied the majority (92.3%), followed by thrombocyte (4.15%), granulocyte (1.7%), lymphocyte (1.5%) and monocyte (0.3%), respectively. Meanwhile, the isolation method of monocytes was established, by density gradient centrifugation to isolate mononuclear leukocytes of peripheral blood...
April 19, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28373555/plasmodium-falciparum-erythrocyte-binding-antigen-175-triggers-a-biophysical-change-in-the-red-blood-cell-that-facilitates-invasion
#9
Marion Koch, Katherine E Wright, Oliver Otto, Maik Herbig, Nichole D Salinas, Niraj H Tolia, Timothy J Satchwell, Jochen Guck, Nicholas J Brooks, Jake Baum
Invasion of the red blood cell (RBC) by the Plasmodium parasite defines the start of malaria disease pathogenesis. To date, experimental investigations into invasion have focused predominantly on the role of parasite adhesins or signaling pathways and the identity of binding receptors on the red cell surface. A potential role for signaling pathways within the erythrocyte, which might alter red cell biophysical properties to facilitate invasion, has largely been ignored. The parasite erythrocyte-binding antigen 175 (EBA175), a protein required for entry in most parasite strains, plays a key role by binding to glycophorin A (GPA) on the red cell surface, although the function of this binding interaction is unknown...
April 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28323046/centaurium-erythraea-methanol-extract-protects-red-blood-cells-from-oxidative-damage-in-streptozotocin-induced-diabetic-rats
#10
Miloš Đorđević, Mirjana Mihailović, Jelena Arambašić Jovanović, Nevena Grdović, Aleksandra Uskoković, Anja Tolić, Marija Sinadinović, Jovana Rajić, Danijela Mišić, Branislav Šiler, Goran Poznanović, Melita Vidaković, Svetlana Dinić
ETHNOPHARMACOLOGICAL RELEVANCE: Centaurium erythraea Rafn (CE) is a traditional medicinal herb in Serbia with antidiabetic, digestive, antipyretic and antiflatulent effects. AIM OF THE STUDY: To investigate the potential protective effects of the methanol extract of the aerial parts of CE against glyco-oxidative stress in red blood cells (RBCs) in rats with experimentally induced diabetes. MATERIAL AND METHODS: Diabetes was induced in Wistar rats by intraperitoneal (i...
March 16, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28319406/effect-of-apelin-13-on-erythrocyte-deformability-during-ischaemia-reperfusion-injury-of-heart-in-diabetic-rats
#11
H Kartal, F M Comu, A Kucuk, Y Polat, A D Dursun, M Arslan
OBJECTIVES: Erythrocyte deformability and plasma viscosity are of crucial importance for the perfusion of tissues and organs. The aim of this study was to evaluate the effect of apelin-13 on erythrocyte deformability during IR heart injury in diabetic rats. METHODS: Eighteen Wistar Albino rats were included in the study after streptozotocin (55 mg/kg) treatment for four weeks of observation for diabetes existence. The animals were randomly assigned to one of five experimental groups...
2017: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/28314639/acute-dark-chocolate-ingestion-is-beneficial-for-hemodynamics-via-enhancement-of-erythrocyte-deformability-in-healthy-humans
#12
Jana Radosinska, Martina Horvathova, Karel Frimmel, Jana Muchova, Maria Vidosovicova, Rastislav Vazan, Iveta Bernatova
Erythrocyte deformability is an important property of erythrocytes that considerably affects blood flow and hemodynamics. The high content of polyphenols present in dark chocolate has been reported to play a protective role in functionality of erythrocytes. We hypothesized that chocolate might influence erythrocytes not only after repeated chronic intake, but also immediately after its ingestion. Thus, we determined the acute effect of dark chocolate and milk (with lower content of biologically active substances) chocolate intake on erythrocyte deformability...
March 2017: Nutrition Research
https://www.readbyqxmd.com/read/28282803/blood-storage-alters-mechanical-stress-responses-of-erythrocytes
#13
Elif Ugurel, Zeynep Kucuksumer, Buse Eglenen, Ozlem Yalcin
BACKGROUND: Erythrocytes undergo irreversible morphological and biochemical changes during storage. Reduced levels of deformability have been reported for stored erythrocytes. Erythrocyte deformability is essential for healthy microcirculation. OBJECTIVE: The aim of this study is to evaluate shear stress (SS) induced improvements of erythrocyte deformability in stored blood. METHODS: Deformability changes were evaluated by applying physiological levels of SS (5 and 10 Pa) in metabolically depleted blood for 48 hours and stored blood for 35 days with citrate phosphate dextrose adenine-1 (CPDA-1)...
March 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28256231/interplay-of-platelet-contractility-and-elasticity-of-fibrin-erythrocytes-in-blood-clot-retraction
#14
Valerie Tutwiler, Hailong Wang, Rustem I Litvinov, John W Weisel, Vivek B Shenoy
Blood clot contraction (retraction) is driven by platelet-generated forces propagated by the fibrin network and results in clot shrinkage and deformation of erythrocytes. To elucidate the mechanical nature of this process, we developed a model that combines an active contractile motor element with passive viscoelastic elements. Despite its importance for thrombosis and wound healing, clot contraction is poorly understood. This model predicts how clot contraction occurs due to active contractile platelets interacting with a viscoelastic material, rather than to the poroelastic nature of fibrin, and explains the observed dynamics of clot size, ultrastructure, and measured forces...
February 28, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28254346/persistent-inflammation-with-pedal-osteolysis-1year-after-charcot-neuropathic-osteoarthropathy
#15
David R Sinacore, Kathryn L Bohnert, Kirk E Smith, Mary K Hastings, Paul K Commean, David J Gutekunst, Jeffrey E Johnson, Fred W Prior
AIMS: To determine local and systemic markers of inflammation and bone mineral density (BMD) in the foot and central sites in participants with diabetes mellitus and peripheral neuropathy (DMPN) with and without acute Charcot neuropathic osteoarthropathy (CN). METHODS: Eighteen participants with DMPN and CN and 19 participants without CN had foot temperature assessments, serum markers of inflammation [C-reactive protein, (CRP) and erythrocyte sedimentation rate, (ESR)] and BMD of the foot, hip and lumbar spine at baseline and 1year follow-up...
June 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28242089/inhalation-of-methane-preserves-the-epithelial-barrier-during-ischemia-and-reperfusion-in-the-rat-small-intestine
#16
András T Mészáros, Tamás Büki, Borbála Fazekas, Eszter Tuboly, Kitti Horváth, Marietta Z Poles, Szilárd Szűcs, Gabriella Varga, József Kaszaki, Mihály Boros
BACKGROUND: Methane is part of the gaseous environment of the intestinal lumen. The purpose of this study was to elucidate the bioactivity of exogenous methane on the intestinal barrier function in an antigen-independent model of acute inflammation. METHODS: Anesthetized rats underwent sham operation or 45-min occlusion of the superior mesenteric artery. A normoxic methane (2.2%)-air mixture was inhaled for 15 min at the end of ischemia and at the beginning of a 60-min or 180-min reperfusion...
February 24, 2017: Surgery
https://www.readbyqxmd.com/read/28226242/plasmodium-falciparum-ligand-binding-to-erythrocytes-induce-alterations-in-deformability-essential-for-invasion
#17
Xavier Sisquella, Thomas Nebl, Jennifer K Thompson, Lachlan Whitehead, Brian M Malpede, Nichole D Salinas, Kelly Rogers, Niraj H Tolia, Andrea Fleig, Joseph O'Neill, Wai-Hong Tham, F David Horgen, Alan F Cowman
The most lethal form of malaria in humans is caused by Plasmodium falciparum. These parasites invade erythrocytes, a complex process involving multiple ligand-receptor interactions. The parasite makes initial contact with the erythrocyte followed by dramatic deformations linked to the function of the Erythrocyte binding antigen family and P. falciparum reticulocyte binding-like families. We show EBA-175 mediates substantial changes in the deformability of erythrocytes by binding to glycophorin A and activating a phosphorylation cascade that includes erythrocyte cytoskeletal proteins resulting in changes in the viscoelastic properties of the host cell...
February 22, 2017: ELife
https://www.readbyqxmd.com/read/28222499/prediction-of-the-level-and-duration-of-shear-stress-exposure-that-induces-subhemolytic-damage-to-erythrocytes
#18
Michael J Simmonds, Herbert J Meiselman
BACKGROUND: Current generation mechanical circulatory assist devices are designed to minimize high shears to blood for prolonged durations to avoid hemolysis. However, red blood cells (RBC) demonstrate impaired capacity to deform when exposed to shear stress (SS) well below the "hemolytic threshold". OBJECTIVE: We endeavored to identify how changes in the magnitude and duration of SS exposure alter RBC deformability and subsequently develop a model to predict erythrocyte subhemolytic damage...
2016: Biorheology
https://www.readbyqxmd.com/read/28214533/the-effect-and-mechanism-of-inhibiting-glucose-6-phosphate-dehydrogenase-activity-on-the-proliferation-of-plasmodium-falciparum
#19
Zhiqiang Zhang, Xiaodan Chen, Chengrui Jiang, Zishui Fang, Yi Feng, Weiying Jiang
We screened >40,000 patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency and found that the G6PD Kaiping allele was under the most positive selection for fighting against malaria in the Chinese population. However, the mechanism is unknown. The current study was designed to investigate the anti-malarial effect and mechanism of G6PD deficiency. Dehydroepiandrosterone (DHEA) was utilised for inhibiting the G6PD activity of erythrocytes. Giemsa staining of blood smears and quantitative real-time PCR were used for the detection and quantification of Plasmodium falciparum infection...
May 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28212709/erythrocyte-deformability-and-aggregation-responses-to-intermittent-and-continuous-artificial-gravity-exposure
#20
Grau Marijke, Abeln Vera, Vogt Tobias, Bloch Wilhelm, Schneider Stefan
Artificial gravity protocols are used to improve g-tolerance of aviators and discussed as countermeasure during prolonged space flight. Little is known about the impact of artificial gravity on the red blood cells (RBC). The purpose of the study was to test how artificial gravity affects RBC deformability and aggregation, which are important determinants of microcirculation. Nine male subjects were exposed to two hypergravity protocols using a short arm human centrifuge: a continuous (CONT) protocol with constant +2Gz for 30min and an intermittent (INTER) protocol with repeated intervals of +2Gz and rest...
February 2017: Life Sciences in Space Research
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