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erythrocyte deformability

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https://www.readbyqxmd.com/read/28373555/plasmodium-falciparum-erythrocyte-binding-antigen-175-triggers-a-biophysical-change-in-the-red-blood-cell-that-facilitates-invasion
#1
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 3, 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
#2
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
#3
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
#4
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 7, 2017: Nutrition Research
https://www.readbyqxmd.com/read/28282803/blood-storage-alters-mechanical-stress-responses-of-erythrocytes
#5
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
#6
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
#7
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...
February 14, 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
#8
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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/28158274/alterations-of-erythrocyte-rheology-and-cellular-susceptibility-in-end-stage-renal-disease-effects-of-peritoneal-dialysis
#13
Nesrin Zeynep Ertan, Semra Bozfakioglu, Elif Ugurel, Mukaddes Sinan, Ozlem Yalcin
In this study, we investigated the effects of peritoneal dialysis on hemorheological and hematological parameters and their relations with oxidant and antioxidant status of uremic patients. Hemorheological parameters (erythrocyte deformability, erythrocyte aggregation, osmotic deformability, blood and plasma viscosity) were measured in patients with renal insufficiency undergoing peritoneal dialysis (PD) and volunteers. Erythrocyte deformability, osmotic deformability and aggregation in both autologous plasma and 3% dextran 70 were measured by laser diffraction ektacytometry...
2017: PloS One
https://www.readbyqxmd.com/read/28128749/comparative-erythrocyte-deformability-investigations-by-filtrometry-slit-flow-and%C3%A2-rotational-ektacytometry-in-a-long-term-follow-up-animal-study-on-splenectomy-and%C3%A2-different-spleen-preserving-operative-techniques-partial-or-subtotal-spleen-resection-and-spleen
#14
Iren Miko, Norbert Nemeth, Viktoria Sogor, Ferenc Kiss, Eniko Toth, Katalin Peto, Andrea Furka, Erzsebet Vanyolos, Laszlo Toth, Jozsef Varga, Krisztian Szigeti, Ilona Benkő, Anna V Olah, Istvan Furka
BACKGROUND: Partial or subtotal spleen resection or spleen autotransplantation can partly preserve/restore the splenic filtration function, as previous studies demonstrated. OBJECTIVE: For better evaluation and follow-up of the various spleen-preserving operative techniques' effectiveness versus splenectomy, a composite methodological approach was applied in a canine experimental model. METHODS: Beagle dogs were subjected to control (n = 6), splenectomy (SE, n = 4), partial and subtotal spleen resection (n = 4/each) or spleen autotransplantation groups (AU, Furka's spleen-chip method, n = 8)...
January 27, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28117428/focusing-and-alignment-of-erythrocytes-in-a-viscoelastic-medium
#15
Taesik Go, Hyeokjun Byeon, Sang Joon Lee
Viscoelastic fluid flow-induced cross-streamline migration has recently received considerable attention because this process provides simple focusing and alignment over a wide range of flow rates. The lateral migration of particles depends on the channel geometry and physicochemical properties of particles. In this study, digital in-line holographic microscopy (DIHM) is employed to investigate the lateral migration of human erythrocytes induced by viscoelastic fluid flow in a rectangular microchannel. DIHM provides 3D spatial distributions of particles and information on particle orientation in the microchannel...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28091909/modes-of-hypotensive-action-of-dihydroquercetin-in-arterial-hypertension
#16
M B Plotnikov, O I Aliev, A V Sidekhmenova, A Yu Shamanaev, A M Anishchenko, A V Nosarev, E A Pushkina
We studied the effect of dihydroquercetin (20 mg/kg/day intragastrically for 6 weeks) on mean BP and macro- and microrheological blood parameters in hypertensive SHR rats; in vitro effect of dihydroquercetin on the tone in thoracic aorta rings isolated from hypertensive SHR rats were also examined. At the end of the treatment course, the mean BP in the experimental rats decreased by 11%; the left ventricular mass index by 2%, and whole blood viscosity by 7-10% in comparison with control SHR rats; erythrocyte aggregation half-time increased by 15%; plasma viscosity, hematocrit, and erythrocyte deformability did not change...
January 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28079842/increased-erythrocyte-aggregation-and-oxidative-stress-in-patients-with-idiopathic-interstitial-pneumonia
#17
Erhan Ugurlu, Emine Kilic-Toprak, Goksel Altinisik, Ozgen Kilic-Erkek, Betul Cengiz, Vural Kucukatay, Hande Senol, Ismail Hakki Akbudak, Yusuf Ekbic, Melek Bor-Kucukatay
BACKGROUND: Hemorheological properties are important determinants of tissue oxygenation. Although hemorheological alterations in various lung diseases have been well-defined, no information is available about the effects of idiopathic interstitial pneumonia (IIP) on hemorheological parameters. OBJECTIVES: The aim of this study was to investigate hemorheological parameters (erythrocyte deformability, aggregation, and plasma viscosity -PV) and associated oxidative stress indices in patients with IIP...
December 23, 2016: Sarcoidosis, Vasculitis, and Diffuse Lung Diseases: Official Journal of WASOG
https://www.readbyqxmd.com/read/28028649/application-of-a-modified-thoracoabdominal-approach-that-avoids-cutting-open-the-costal-portion-of-diaphragm-during-anterior-thoracolumbar-spine-surgery
#18
Jiandang Shi, Xuefeng Yue, Ningkui Niu, Chen Zhao, Hongyan Qiu, Zili Wang
PURPOSE: In the present prospective randomized controlled study, we compared the feasibility and effectiveness of our modified thoracoabdominal approach to anterior thoracolumbar spine surgery without cutting open the costal portion of diaphragm (extradiaphragmatic approach) with the traditional transdiaphragmatic thoracoabdominal approach. The traditional combined thoracoabdominal approach in anterior thoracolumbar surgery for spine tuberculosis is effective but seriously damages the diaphragm and causes various lung complications...
December 27, 2016: European Spine Journal
https://www.readbyqxmd.com/read/27987495/-significance-of-v-raf-murine-sarcoma-viral-oncogene-homologue-b1-in-rheumatoid-arthritis
#19
Y J Jin, L Sun, L Yang, R Xing, X Y Liu
OBJECTIVE: To detect serum v-raf murine sarcoma viral oncogene homologue B1 (BRAF) protein levels and to investigate their clinical significance in rheumatoid arthritis (RA) patients. METHODS: Serum samples were obtained from 78 RA patients, 32 osteoarthritis (OA) patients, 16 systemic lupus erythematosus (SLE) patients, 16 gout patients, 16 ankylosing spondylitis (AS) patients, 16 Sjogren syndrome (SS) patients and 30 healthy controls. BRAF protein in the sera was examined by enzyme-linked immunosorbent assay (ELISA)...
December 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/27943575/reduced-incidence-of-extra-articular-manifestations-of-ra-through-effective-disease-control-karnataka-rheumatoid-arthritis-comorbidity-krac-study
#20
S Chandrashekara, Vineeta Shobha, B G Dharmanand, Ramesh Jois, Sharath Kumar, Kurugodu Mathada Mahendranath, Vikram Haridas, Shiva Prasad, Yogesh Singh, Manisha Ashwin Daware, Anupama Swamy, R Subramanian, Srirama Attappa Somashekar, Arun Madhanaghatta Shanthappa, K R Anupama
AIM: To estimate the prevalence of extra-articular manifestations (EAM) in rheumatoid arthritis (RA) patients and the impact of demographic, clinical and treatment factors. METHOD: The study was carried out as a part of 'Karnataka Rheumatoid arthritis comorbidity (KRAC) study' conducted at 14 centers across Karnataka, India between September 2014 and July 2015. The data were collected by trained clinical research associates using a structured pro forma, under the supervision of the consulting rheumatologists...
December 10, 2016: International Journal of Rheumatic Diseases
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