Read by QxMD icon Read


Philippe A Gallay, Udayan Chatterji, Aaron Kirchhoff, Angel Gandarilla, Richard B Pyles, Marc M Baum, John A Moss
Introduction: In the absence of a vaccine, there is an urgent need for the identification of effective agents that prevent HIV transmission in uninfected individuals. Non-vaccine Biomedical Prevention (nBP) methods, such as topical or systemic pre-exposure prophylaxis (PrEP), are promising strategies to slow down the spread of AIDS. Methods: In this study, we investigated the microbicidal efficacy of the viral membrane-disrupting amphipathic SWLRDIWDWICEVLSDFK peptide called C5A...
2018: Open Virology Journal
Emmet A Francis, Volkmar Heinrich
Global bursts in free intracellular calcium (Ca2+ ) are among the most conspicuous signaling events in immune cells. To test the common view that Ca2+ bursts mediate rearrangement of the actin cytoskeleton in response to the activation of G protein-coupled receptors, we combined single-cell manipulation with fluorescence imaging and monitored the Ca2+ concentration in individual human neutrophils during complement-mediated chemotaxis. By decoupling purely chemotactic pseudopod formation from cell-substrate adhesion, we showed that physiological concentrations of anaphylatoxins, such as C5a, induced nonadherent human neutrophils to form chemotactic pseudopods but did not elicit Ca2+ bursts...
March 13, 2018: Science Signaling
Anshu Babbar, Andreas Itzek, Dietmar H Pieper, D Patric Nitsche-Schmitz
Streptococcus dysgalactiae subsp. equisimilis (SDSE), belonging to the group C and G streptococci, are human pathogens reported to cause clinical manifestations similar to infections caused by Streptococcus pyogenes. To scrutinize the distribution of gene coding for S. pyogenes virulence factors in SDSE, 255 isolates were collected from humans infected with SDSE in Vellore, a region in southern India, with high incidence of SDSE infections. Initial evaluation indicated SDSE isolates comprising of 82.35% group G and 17...
March 12, 2018: Folia Microbiologica
Rolf Spirig, Ian K Campbell, Sandra Koernig, Chao-Guang Chen, Bonnie J B Lewis, Rebecca Butcher, Ineke Muir, Shirley Taylor, Jenny Chia, David Leong, Jason Simmonds, Pierre Scotney, Peter Schmidt, Louis Fabri, Andreas Hofmann, Monika Jordi, Martin O Spycher, Susann Cattepoel, Jennifer Brasseit, Con Panousis, Tony Rowe, Donald R Branch, Adriana Baz Morelli, Fabian Käsermann, Adrian W Zuercher
Activation of Fc receptors and complement by immune complexes is a common important pathogenic trigger in many autoimmune diseases and so blockade of these innate immune pathways may be an attractive target for treatment of immune complex-mediated pathomechanisms. High-dose IVIG is used to treat autoimmune and inflammatory diseases, and several studies demonstrate that the therapeutic effects of IVIG can be recapitulated with the Fc portion. Further, recent data indicate that recombinant multimerized Fc molecules exhibit potent anti-inflammatory properties...
March 12, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
Katharina Bröker, Julia Figge, Albert F Magnusen, Rudolf A Manz, Jörg Köhl, Christian M Karsten
B-1 cells constitute a unique subpopulation of lymphocytes residing mainly in body cavities like the peritoneal cavity (PerC) but are also found in spleen and bone marrow (BM). As innate-like B cells, they mediate first line immune defense through low-affinity natural IgM (nIgM) antibodies. PerC B-1 cells can egress to the spleen and differentiate into nIgM antibody-secreting plasma cells that recognize conserved exogenous and endogenous cellular structures. Homing to and homeostasis within the PerC are regulated by the chemokine CXCL13 released by PerC macrophages and stroma cells...
2018: Frontiers in Immunology
Jonathan H Foley, Edward M Conway
The complement system, comprising over 30 soluble and cell-based proteins, is a major component of innate immunity, providing mechanisms of surveillance to detect and discard invading pathogens and damaged host cells (reviewed in [1, 2]). Triggered by recognition of altered molecular complexes on membrane surfaces that are sensed as danger signals, complement activation proceeds via three cascade-like pathways - lectin, classical, and alternative - which converge with the formation of a C3 convertase. Subsequent downstream generation of multiple complement byproducts, including the anaphylatoxins, C3a and C5a, leads to inflammation, opsonization, phagocytosis, and destruction of the target cell/pathogen, with recruitment of an adaptive immune response to effect long-term protection and repair...
March 8, 2018: Journal of Thrombosis and Haemostasis: JTH
Peter Horvath, David L Tarnoki, Adam D Tarnoki, Kinga Karlinger, Zsofia Lazar, Gyorgy Losonczy, Laszlo Kunos, Andras Bikov
The complement system may play a role in the systemic inflammation characterising obstructive sleep apnea; however, this has not been investigated before. We aimed to study the involvement of effector complement elements in obstructive sleep apnea, namely C3a, C5a and SC5b-9. Venous blood was collected in 50 patients with obstructive sleep apnea and 26 control subjects in the evening and the following morning. Plasma complement proteins were analysed with ELISA. Complement factor levels were compared between the two groups and correlated with clinical variables...
March 1, 2018: Journal of Sleep Research
Min-Hua Tseng, Shih-Hua Lin, Chao-Yi Wu, Hui-Ping Chien, Huang-Yu Yang, Yung-Chang Chen, Yu-Ching Chou, Jing-Long Huang
Although aberrant complement activation is involved in the pathogenesis of systemic lupus erythematosus (SLE), the role of complement regulatory proteins in disease activity of SLE remains limited. We enrolled the pediatric-onset SLE patients from our cohort study over 10 years. The clinical and laboratory data including SLEDAI disease activity score, and serum complement factor H (CFH), CFI, CD46, C5a, and C5b-9 in the active and remission phases were determined. Glomerular C5b-9 deposition as a complement activity marker was also examined...
February 2, 2018: Oncotarget
Akhabue K Okojie, O E Okobi, Hamza Dar, Hurmat Malik, Mehreen Arif, Khalid Rauf, Eghosa E Iyare
In Africa, a large number of pregnancies are exposed to Plasmodium falciparum infection. The in-utero environment extremely influences childhood neurodevelopment and behaviour. The complement 5a receptor (C5aR) is linked to several disease conditions. However, the influence of Plasmodium berghei during pregnancy on maternal complement 5a receptor and subsequently on fetal behaviour is unknown. Pregnant mice were intra-peritoneally inoculated on gestational day 13 with 1.02x105 infected red blood cells (iRBCs)...
December 30, 2017: Nigerian Journal of Physiological Sciences: Official Publication of the Physiological Society of Nigeria
Manoj K Pandey, Gregory A Grabowski, Jörg Köhl
The complement system is well appreciated for its role as an important effector of innate immunity that is activated by the classical, lectin or alternative pathway. C5a is one important mediator of the system that is generated in response to canonical and non-canonical C5 cleavage by circulating or cell-derived proteases. In addition to its function as a chemoattractant for neutrophils and other myeloid effectors, C5a and its sister molecule C3a have concerted roles in cell homeostasis and surveillance. Through activation of their cognate G protein coupled receptors, C3a and C5a regulate multiple intracellular pathways within the mitochondria and the lysosomal compartments that harbor multiple enzymes critical for protein, carbohydrate and lipid metabolism...
February 22, 2018: Seminars in Immunology
Yuan Gao, Rui Hou, Yixin Han, Qiaoling Fei, Runlan Cai, Yun Qi
Among traditional Chinese medicine injections, intravenous Shuang-Huang-Lian (IV-SHL) has the highest incidence of injection-induced immediate hypersensitivity reactions (IHRs). The precise mechanisms of IV-SHL-induced IHRs remain ambiguous. In this study, we investigated the mechanisms of SHL injection (SHLI)-induced IHRs. Our data showed that serum total IgE and mouse mast cell protease 1 (MMCP1) levels were higher in the SHLI antiserum; however, these effects of SHLI disappeared in the antibiotic-treated mice...
February 23, 2018: Scientific Reports
Ibragim Gaidarov, Todd Anthony, Joel Gatlin, Xiaohua Chen, David Mills, Michelle Solomon, Sangdon Han, Graeme Semple, David J Unett
GPR84 is an orphan G-protein coupled receptor, expressed on monocytes, macrophages and neutrophils and is significantly upregulated by inflammatory stimuli. The physiological role of GPR84 remains largely unknown. Medium chain fatty acids (MCFA) activate the receptor and have been proposed to be its endogenous ligands, although the high concentrations of MCFAs required for receptor activation generally exceed normal physiological levels. We identified the natural product embelin as a highly potent and selective surrogate GPR84 agonist (originally disclosed in patent application WO2007027661A2, 2007) and synthesized close structural analogs with widely varying receptor activities...
February 19, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
XuDong Huang, Wei Zhao, LiXia Zhang, XinJun Yang, LiHui Wang, YunShuang Chen, JingHua Wang, Chao Zhang, GuangLi Wu
Rhabdomyolysis (RM) may cause kidney damage and results primarily in acute kidney injury (AKI). Complement is implicated in the pathogenesis of renal diseases and ischemia-reperfusion injury (IRI), but the role of complement, especially its activation pathway(s) and its effect in RM-induced AKI, is not clear. This study established a rat model of AKI induced by RM via intramuscular treatment with glycerol. Cobra venom factor (CVF) was administered via tail vein injection to deplete complement 12 h prior to intramuscular injection of glycerol...
2018: PloS One
Larissa F Marchi, Adriana B Paoliello-Paschoalato, Renê D R Oliveira, Ana Elisa C S Azzolini, Luciana M Kabeya, Eduardo A Donadi, Yara Maria Lucisano-Valim
We examined the functional activity of peripheral blood neutrophils and the complement system activation status in patients with rheumatoid arthritis (RA) undergoing infliximab/methotrexate combined therapy. We studied female RA patients under treatment with infliximab (3-5 mg/kg) and methotrexate (15-25 mg/week) who presented inactive (i-RA; n = 34, DAS-28 ≤ 2.6) or at least moderately active disease (a-RA; n = 29, DAS-28 > 3.2), and age-matched healthy women (n = 38). We measured the levels of reactive oxygen species (ROS) generation (chemiluminescence assay) and membrane expression of FcγRIIa/CD32, FcγRIIIb/CD16, CR1/CD35, and CR3/CD11b receptors (ELISA assay) in neutrophils...
February 20, 2018: Rheumatology International
Marta Albalate Ramón, Patricia Martínez Miguel, Lourdes Bohorquez, Patricia de Sequera, Hanane Bouarich, Rafael Pérez-García, Diego Rodríguez Puyol, Guillermina Barril, Jose Antonio Sánchez Tomero, Martin Giorgi, Manuel Rafael Ramirez Chamond
BACKGROUND: In post-dilution haemodiafiltration only synthetic membranes have been used to date. Asymmetric cellulose triacetate (ATA™) is now available, whose characteristics are suitable for this technique. OBJECTIVES: To describe the in vivo performance and behaviour of this membrane, to identify its depurative effectiveness, use in clinical practice and its biocompatibility, both acute and after one month of treatment. METHODS: Observational prospective study of 23 patients who were dialysed for 4 weeks using an ATA™ membrane and who maintained their prior regimen...
February 14, 2018: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
XuanLi Liu, Pauline Heitz, Michel Roux, Daniel Keller, Tristan Bourcier, Arnaud Sauer, Gilles Prévost, David Gaucher
Experimental models have established Panton-Valentine leukocidin (PVL) as a potential critical virulence factor during Staphylococcus aureus endophthalmitis. In the present study, we aimed to identify retinal cell targets for PVL and to analyze early retinal changes during infection. After the intravitreous injection of PVL, adult rabbits were euthanized at different time points (30 min, 1, 2, 4 and 8 h). PVL location in the retina, expression of its binding receptor C5a receptor (C5aR), and changes in Müller and microglial cells were analyzed using immunohistochemistry, Western blotting and RT-qPCR...
February 13, 2018: Scientific Reports
Xiao-Hui Chen, Cheng-Chao Ruan, Qian Ge, Yu Ma, Jian-Zhong Xu, Ze-Bei Zhang, Jingrong Lin, Dongrui Chen, Dingliang Zhu, Ping-Jin Gao
<u>Rationale:</u> Inflammation and immunity play crucial roles in the development of hypertension. Complement activation-mediated innate immune response is involved in the regulation of hypertension and target organ damage. However, whether complement-mediated T cell functions could regulate blood pressure (BP) elevation in hypertension is still unclear. <u>Objective:</u> We aim to determine whether complement C3a receptor (C3aR) and C5a receptor (C5aR) could regulate BP via modulating regulatory T cells (Tregs)...
February 5, 2018: Circulation Research
E W Skjeflo, D Christiansen, H Fure, J K Ludviksen, T M Woodruff, Terje Espevik, E W Nielsen, O L Brekke, T E Mollnes
BACKGROUND: There is extensive cross-talk between the complement system, the Toll-like receptors (TLR) and hemostasis. Consumptive coagulopathy is a hallmark of sepsis and often mediated through increased tissue factor (TF) expression. OBJECTIVES: To study the relative roles of complement, TLRs and TF in Staphylococcus aureus (S. aureus)-induced coagulation. METHODS: Lepirudin-anticoagulated human whole blood was incubated with the three S...
February 13, 2018: Journal of Thrombosis and Haemostasis: JTH
Camilla Mohlin, Kerstin Sandholm, Anders Kvanta, Kristina N Ekdahl, Kjell Johansson
BACKGROUND: The complement system (CS) plays a role in the pathogenesis of a number of ocular diseases, including diabetic retinopathy (DR), glaucoma, uveitis, and age-related macular degeneration (AMD). Given that many of the complex eye-related degenerative diseases have limited treatment opportunities, we aimed to mimic the in vivo retinal degenerative process by developing a relevant co-culture system. METHOD AND MATERIALS: The adult porcine retina was co-cultured with the spontaneously arising human retinal pigment epithelial cells-19 (ARPE-19)...
February 13, 2018: Upsala Journal of Medical Sciences
Boopathi Sowndhar Rajan, Senthamizharasi Manivasagam, Suresh Dhanusu, Navvi Chandrasekar, Kalaiselvi Krishna, Lakshmi Priya Kalaiarasu, Aadhil Ashwaq Babu, Elangovan Vellaichamy
The present study was aimed to investigate the effect of diet derived AGEs (dAGEs) on the circulatory levels of pro-inflammatory cytokines, chemokines and to evaluate the protective efficacy of natural anti-oxidants curcumin (CU) and gallic acid (GA) respectively against the dAGEs-induced systemic inflammation in experimental Swiss albino mice. The experimental mice were fed with dAGEs in the presence and absence of CU and GA for 6 months. The levels of 40 circulatory pro-inflammatory cytokines and chemokines were evaluated using Proteome-Cytokine Array kit...
February 9, 2018: Food and Chemical Toxicology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"