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leukocyte adhesion

Jessica Lee Weaver, Paul J Matheson, Amy Matheson, Victoria S Graham, Cynthia Downard, Richard Neal Garrison, Jason W Smith
Brain death is associated with significant inflammation within the kidneys, which may contribute to reduced graft survival. Direct peritoneal resuscitation (DPR) has been shown to reduce systemic inflammation after brain death. To determine its effects, brain dead rats were resuscitated with normal saline (targeted intravenous fluid, TIVF) to maintain a mean arterial pressure of 80 mmHg and DPR animals also received 30cc of intraperitoneal peritoneal dialysis solution. Rats were euthanized at zero, two, four, and six hours after brain death...
April 18, 2018: American Journal of Physiology. Renal Physiology
Richard R Gammon, Harold Alvarez, Nancy Benitez
BACKGROUND: Here, we describe a 14-year-old male with leukocyte adhesion deficiency type 2 who was transferred to a university hospital with anemia (hemoglobin 6 g/dL) and multiple singular abscesses refractory to antimicrobials. CASE REPORT: As leukocyte adhesion deficiency type 2 is associated with Bombay phenotype, the patient's red blood cells (RBCs) were tested with commercial anti-H lectin Ulex europaeus. An allogeneic adsorption with phenotype-matched cells was performed...
April 17, 2018: Transfusion
Hsin-Ching Sung, Chen-Wei Liu, Chien-Yu Hsiao, Shu-Rung Lin, I-Shing Yu, Shu-Wha Lin, Ming-Hsien Chiang, Chan-Jung Liang, Chi-Ming Pu, Yu-Chen Chen, Ming-Shian Lin, Yuh-Lien Chen
BACKGROUND: The extracts from wild bitter gourd fruit (WBGE) were reported to possess numerous pharmacological activities. However, the anti-inflammatory effects of WBGE on human lung epithelial cells and the underlying mechanisms have not been determined. PURPOSE: To evaluate the molecular basis of the effects of WBGE on intercellular adhesion molecule-1 (ICAM-1) expression in alveolar epithelial (A549) cells, C57BL/6 wild-type (WT) mice and microRNA (miR)-221/-222 knockout (KO) mice with or without tumor necrosis factor (TNF-α; 3 ng/ml) treatment...
March 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Giuseppe Derosa, Gabriele Catena, Riccardo Raddino, Giovanni Gaudio, Antonio Maggi, Angela D'Angelo, Pamela Maffioli
BACKGROUND: In literature, there are several studies about the effects of nutraceutical combinations at fasting, but data in post-prandial phase are lacking. PURPOSE: We planned a study to evaluate the efficacy and safety of a nutraceutical agent containing fermented red rice, phytosterols and olive polyphenols compared to placebo in a sample of Caucasian patients with low cardiovascular risk, both at fasting and after an oral fat load. STUDY DESIGN: Eighty patients were randomized to receive, as addition to diet and physical activity, a nutraceutical combination containing fermented red rice, sterol esters and stanols, curcumin, and olive polyphenols or placebo (control group), once a day...
March 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Ignacio Catalan-Serra, Øystein Brenna
Inflammatory bowel disease (IBD) is a chronic disabling inflammatory process that affects young individuals, with growing incidence. The etiopathogenesis of IBD remains poorly understood. A combination of genetic and environmental factors triggers an inadequate immune response against the commensal intestinal flora in IBD patients. Thus, a better understanding of the immunological mechanisms involved in IBD pathogenesis is central to the development of new therapeutic options. Current pharmacological treatments used in clinical practice like thiopurines or anti-TNF are effective but can produce significant side effects and their efficacy may diminish over time...
April 6, 2018: Human Vaccines & Immunotherapeutics
Xiao-Mei Yang, Xu-Hao Chen, Jian-Fei Lu, Chang-Man Zhou, Jing-Yan Han, Chun-Hua Chen
Acute brain injury caused by subarachnoid hemorrhage is the major cause of poor prognosis. The pathology of subarachnoid hemorrhage likely involves major morphological changes in the microcirculation. However, previous studies primarily used fixed tissue or delayed injury models. Therefore, in the present study, we used in vivo imaging to observe the dynamic changes in cerebral microcirculation after subarachnoid hemorrhage. Subarachnoid hemorrhage was induced by perforation of the bifurcation of the middle cerebral and anterior cerebral arteries in male C57/BL6 mice...
March 2018: Neural Regeneration Research
Deok-Hoon Kong, Young Kwan Kim, Mi Ra Kim, Ji Hye Jang, Sukmook Lee
Tumor necrosis factor alpha (TNFα) is a pro-inflammatory cytokine that triggers the expression of inflammatory molecules, including other cytokines and cell adhesion molecules. TNFα induces the expression of intercellular cell adhesion molecule-1 and vascular cell adhesion molecule-1 (VCAM-1). VCAM-1 was originally identified as a cell adhesion molecule that helps regulate inflammation-associated vascular adhesion and the transendothelial migration of leukocytes, such as macrophages and T cells. Recent evidence suggests that VCAM-1 is closely associated with the progression of various immunological disorders, including rheumatoid arthritis, asthma, transplant rejection, and cancer...
April 2, 2018: International Journal of Molecular Sciences
Daniel B Kim-Shapiro, Mark T Gladwin
Sickle cell disease is caused by a mutant form of hemoglobin that polymerizes under hypoxic conditions which leads to red blood cell (RBC) distortion, calcium-influx mediated RBC dehydration, increased RBC adhesivity, reduced RBC deformability, increased RBC fragility, and hemolysis. These impairments in RBC structure and function result in multifaceted downstream pathology including inflammation, endothelial cell activation, platelet and leukocyte activation and adhesion, and thrombosis, all of which contribute vascular occlusion and substantial morbidity and mortality...
2018: Clinical Hemorheology and Microcirculation
Ngo Minh Toan, D Thirumalai
Cell adhesion complexes (CACs), which are activated by ligand binding, play key roles in many cellular functions ranging from cell cycle regulation to mediation of cell extracellular matrix adhesion. Inspired by single molecule pulling experiments using atomic force spectroscopy on leukocyte function-associated antigen-1 (LFA-1), expressed in T-cells, bound to intercellular adhesion molecules (ICAM), we performed constant loading rate (rf ) and constant force (F) simulations using the self-organized polymer model to describe the mechanism of ligand rupture from CACs...
March 28, 2018: Journal of Chemical Physics
Angélica Aparecida Antoniellis Silveira, Venina Marcela Dominical, Daiana Morelli Vital, Wilson Alves Ferreira, Fabio Trindade Maranhão Costa, Claudio C Werneck, Fernando Ferreira Costa, Nicola Conran
Neutrophil adhesion to the vasculature in response to potent inflammatory stimuli, such as TNF-α (TNF), can contribute to atheroprogression amongst other pathophysiological mechanisms. Previous studies have shown that simvastatin, a statin with known pleiotropic anti-inflammatory properties, can partially abrogate the effects of TNF-induced neutrophil adhesion, in association with the modulation of β2 -integrin expression. We aimed to further characterize the effects of this statin on neutrophil and leukocyte adhesive mechanisms in vitro and in vivo...
March 28, 2018: International Immunopharmacology
Gracia Porras, Matilde S Ayuso, Consuelo González-Manchón
The highly sialoglycosylated extracellular domain of podocalyxin (Podxl) is a constituent of the endothelial glycocalyx of most blood vessels but it is unknown if Podxl plays a prominent role in the function of the glycocalyx as a regulator of leukocyte-endothelial adhesion. We have recently found that mice lacking Podxl in the vascular endothelium develop histological lesions compatible with severe vasculitis resulting in organ failure and premature death. In this work, we show that these mice have an increased quantity of resident leukocytes within the peritoneal cavity in both basal and inflammatory conditions...
March 28, 2018: International Journal of Biochemistry & Cell Biology
Huifeng Hao, Sheng Hu, Qing Wan, Chuansheng Xu, Hong Chen, Liyuan Zhu, Zhenyu Xu, Jian Meng, Richard M Breyer, Nailin Li, De-Pei Liu, Garret A FitzGerald, Miao Wang
OBJECTIVE: Deletion of mPGES-1 (microsomal prostaglandin E synthase-1)-an anti-inflammatory target alternative to COX (cyclooxygenase)-2-attenuates injury-induced neointima formation in mice. This is attributable to the augmented levels of PGI2 (prostacyclin)-a known restraint of the vascular response to injury, acting via IP (I prostanoid receptor). To examine the role of mPGES-1-derived PGE2 (prostaglandin E2) in vascular remodeling without the IP. APPROACH AND RESULTS: Mice deficient in both IP and mPGES-1 (DKO [double knockout] and littermate controls [IP KO (knockout)]) were subjected to angioplasty wire injury...
March 29, 2018: Arteriosclerosis, Thrombosis, and Vascular Biology
Matthew F Yuyun, Leong L Ng, G André Ng
Homeostasis around vascular endothelium is a function of the equilibrium between the bioavailability of nitric oxide (NO) and oxidizing reactive oxygen species (ROS). Within the vascular endothelium, NO enhances vasodilatation, reduces platelet aggression and adhesion (anti-thrombotic), prevents smooth muscle proliferation, inhibits adhesion of leukocytes and expression of pro-inflammatory cytokines genes (anti-inflammatory), and counters the oxidation of low density lipoprotein (LDL) cholesterol. A shift in the equilibrium that favours NO deficiency and ROS formation leads to endothelial dysfunction and cardiovascular disease...
March 26, 2018: Microvascular Research
Irina V Gorudko, Daria V Grigorieva, Alexey V Sokolov, Ekaterina V Shamova, Valeria A Kostevich, Igor V Kudryavtsev, Elena D Syromiatnikova, Vadim B Vasilyev, Sergey N Cherenkevich, Oleg M Panasenko
Myeloperoxidase (MPO) is an oxidant-producing enzyme that can also regulate cellular functions via its nonenzymatic effects. Mature active MPO isolated from normal human neutrophils is a 145 kDa homodimer, which consists of two identical protomers, connected by a single disulfide bond. By binding to CD11b/CD18 integrin, dimeric MPO induces neutrophil activation and adhesion augmenting leukocyte accumulation at sites of inflammation. This study was performed to compare the potency of dimeric and monomeric MPO to elicit selected neutrophil responses...
March 27, 2018: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
Sofia Nordling, Johan Brännström, Fredrik Carlsson, Bo Lu, Evelyn Salvaris, Alkwin Wanders, Jos Buijs, Sergio Estrada, Vladimir Tolmachev, Peter J Cowan, Tomas Lorant, Peetra U Magnusson
Ischemia reperfusion injury is one of the major complications responsible for delayed graft function in kidney transplantation. Applications to reduce reperfusion injury are essential due to the widespread use of kidneys from deceased organ donors where the risk for delayed graft function is especially prominent. We have recently shown that coating of inflamed or damaged endothelial cells with a unique heparin conjugate reduces thrombosis and leukocyte recruitment. In this study we evaluated the binding capacity of the heparin conjugate to cultured human endothelial cells, to kidneys from brain-dead porcine donors, and to murine kidneys during static cold storage...
March 26, 2018: Scientific Reports
Guro Kristin Melve, Elisabeth Ersvaer, Kristin Paulsen Rye, Aymen Bushra Ahmed, Einar K Kristoffersen, Tor Hervig, Håkon Reikvam, Kimberley Joanne Hatfield, Øystein Bruserud
BACKGROUND: Peripheral blood stem cells from healthy donors mobilized by granulocyte colony-stimulating factor (G-CSF) and thereafter harvested by leukapheresis are commonly used for allogeneic stem cell transplantation. METHODS: Plasma levels of 38 soluble mediators (cytokines, soluble adhesion molecules, proteases, protease inhibitors) were analyzed in samples derived from healthy stem cell donors before G-CSF treatment and after 4 days, both immediately before and after leukapheresis...
March 22, 2018: Cytotherapy
Elżbieta Sadurska, Agnieszka Zaucha-Prażmo, Agnieszka Brodzisz, Jerzy Kowalczyk, Iwona Beń-Skowronek
INTRODUCTION: Late cardiovascular complications are the leading causes of morbidity and mortality in patients treated for common malignancies of childhood. Late cardiotoxicity include increased development of atherosclerosis and atherosclerosis - related diseases. An evaluation of the endothelium can be made based on the measurement of endothelium-derived blood vasoactive factors, such as cytokines and adhesion molecules. Their elevated serum levels may serve as sensitive indicators of early atherosclerotic lesions in high risk patients...
March 14, 2018: Annals of Agricultural and Environmental Medicine: AAEM
Jacek Dutkiewicz, Violetta Zając, Jacek Sroka, Bernard Wasiński, Ewa Cisak, Anna Sawczyn, Anna Kloc, Angelina Wójcik-Fatla
<i>Streptococcus suis</i> is a re-emerging zoonotic pathogen that may cause severe disease, mostly meningitis, in pigs and in humans having occupational contact with pigs and pork, such as farmers, slaughterhose workers and butchers. The first stage of the pathogenic process, similar in pigs and humans, is adherence to and colonisation of mucosal and/or epithelial surface(s) of the host. The second stage is invasion into deeper tissue and extracellular translocation of bacterium in the bloodstream, either free in circulation or attached to the surface of monocytes...
March 14, 2018: Annals of Agricultural and Environmental Medicine: AAEM
Mo-Lin Wang, Yu-Ming Kang, Xiao-Guang Li, Qing Su, Hong-Bao Li, Kai-Li Liu, Li-Yan Fu, Roland Osei Saahene, Ying Li, Hong Tan, Xiao-Jing Yu
BACKGROUND: Inflammation has been implicated in the development of cardiovascular disease. We determined whether nod-like receptor with pyrin domain containing 3 (NLRP3) involved in the process of prehypertension, central blockade of NLRP3 decreased inflammation reaction, regulated neurohormonal excitation, and delayed the progression of prehypertension. METHODS: Prehypertensive rats were induced by 8% salt diet. The rats on high-salt diet for 1 month were administered a specific NLRP3 blocker in the hypothalamic paraventricular nucleus (PVN) for 4 weeks...
March 24, 2018: Journal of Neuroinflammation
Bérénice Grec, Bertrand Maury, Nicolas Meunier, Laurent Navoret
Cell adhesion on the vascular wall is a highly coupled process where blood flow and adhesion dynamics are closely linked. Cell dynamics in the vicinity of the vascular wall is driven mechanically by the competition between the drag force of the blood flow and the force exerted by the bonds created between the cell and the wall. Bonds exert a friction force. Here, we propose a mathematical model of such a competitive system, namely leukocytes whose capacity to create bonds with the vascular wall and transmigratory ability are coupled by integrins and chemokines...
March 20, 2018: Journal of Theoretical Biology
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