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C3 complement

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https://www.readbyqxmd.com/read/28525986/the-lspc3-41i-restriction-modification-system-is-the-major-determinant-for-genetic-manipulations-of-lysinibacillus-sphaericus-c3-41
#1
Pan Fu, Yong Ge, Yiming Wu, Ni Zhao, Zhiming Yuan, Xiaomin Hu
BACKGROUND: Lysinibacillus sphaericus has been widely used in integrated mosquito control program and it is one of the minority bacterial species unable to metabolize carbohydrates. In consideration of the high genetic conservation at genomic level and difficulty of genetic horizontal transfer, it is hypothesized that effective restriction-modification (R-M) systems existed in mosquitocidal L. sphaericus. RESULTS: In this study, six type II R-M systems including LspC3-41I were predicted in L...
May 19, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28515136/loss-of-humoral-and-cellular-immunity-to-invasive-nontyphoidal-salmonella-during-current-or-convalescent-plasmodium-falciparum-infection-in-malawian-children
#2
Tonney S Nyirenda, James T Nyirenda, Dumizulu L Tembo, Janet Storm, Queen Dube, Chisomo L Msefula, Kondwani C Jambo, Henry C Mwandumba, Robert S Heyderman, Melita A Gordon, Wilson L Mandala
Invasive nontyphoidal Salmonella (iNTS) infections are commonly associated with Plasmodium falciparum infections, but the immunologic basis for this linkage is poorly understood. We hypothesized that P. falciparum infection compromises the hosts' humoral and cellular immunity to NTS which increases their susceptibility to iNTS infection. We prospectively recruited children aged between 6 and 60 months at a Community Health Centre in Blantyre, Malawi and allocated them to the following groups; febrile with uncomplicated malaria, febrile malaria-negative, non-febrile malaria-negative...
May 17, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28512867/the-structural-basis-for-inhibition-of-the-classical-and-lectin-complement-pathways-by-s-aureus-extracellular-adherence-protein
#3
Jordan L Woehl, Kasra X Ramyar, Benjamin B Katz, John K Walker, Brian V Geisbrecht
The extracellular adherence protein (Eap) plays a crucial role in pathogenesis and survival of Staphylococcus aureus by inhibiting the classical and lectin pathways of complement. We have previously shown that Eap binds with nanomolar affinity to complement C4b and disrupts the initial interaction between C4b and C2, thereby inhibiting formation of the classical and lectin pathway C3 pro-convertase. Although an underlying mechanism has been identified, the structural basis for Eap binding to C4b is poorly understood...
May 16, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28511297/-the-effect-of-complement-c3a-receptor-antagonist-in-the-kidney-immune-injury-in-trichloroethylene-sensitized-mice
#4
P Yang, D D Zang, X D Yang, B D Li, X Wang, J X Zhang, Q X Zhu
Objective: To explore the effect of complement C3 a-C3a receptor in the kidney immune inju-ry in trichloroethylene-sensitized mice by using C3a receptor specific antagonist C3aRA and discuss the patho-genesis of kidney injury in occupational dermatitis medicamentosa-like of trichloroethylene (ODMLT) . Methods: 42 female 6~8 weeks old BALB/c mice of specific pathogen free were randomly divided into blank control group (5) , solvent control group (5) , TCE treatment group (16) and TCE+C3aRA treatment group (16) ...
March 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28500075/overexpression-of-human-cd55-and-cd59-or-treatment-with-human-cd55-protects-against-renal-ischemia-reperfusion-injury-in-mice
#5
Anjan K Bongoni, Bo Lu, Evelyn J Salvaris, Veena Roberts, Doreen Fang, Jennifer L McRae, Nella Fisicaro, Karen M Dwyer, Peter J Cowan
Deficiency in the membrane-bound complement regulators CD55 and CD59 exacerbates renal ischemia-reperfusion injury (IRI) in mouse models, but the effect of increasing CD55 and CD59 activity has not been examined. In this study, we investigated the impact of overexpression of human (h) CD55 ± hCD59 or treatment with soluble rhCD55 in a mouse model of renal IRI. Unilaterally nephrectomised mice were subjected to 18 (mild IRI) or 22 min (moderate IRI) warm renal ischemia, and analyzed 24 h after reperfusion for renal function (serum creatinine and urea), complement deposition (C3b/c and C9), and infiltration of neutrophils and macrophages...
May 12, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28495852/high-throughput-mrna-sequencing-of-stromal-cells-from-endometriomas-and-endometrium
#6
Kadri Rekker, Merli Saare, Elo Eriste, Tõnis Tasa, Viktorija Kukuškina, Anne Mari Roost, Kristi Anderson, Külli Samuel, Helle Karro, Andres Salumets, Maire Peters
The aetiology of endometriosis is still unclear and to find mechanisms behind the disease development it is important to study each cell type from endometrium and ectopic lesions independently. The objective of this study was to uncover complete mRNA profiles in uncultured stromal cells from paired samples of endometriomas and eutopic endometrium. High-throughput mRNA sequencing revealed over 1,300 dysregulated genes in stromal cells from ectopic lesions, including several novel genes in the context of endometriosis...
May 11, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28491039/daily-moderate-exercise-is-beneficial-and-social-stress-is-detrimental-to-disease-pathology-in-murine-lupus-nephritis
#7
Saba I Aqel, Jeffrey M Hampton, Michael Bruss, Kendra T Jones, Giancarlo R Valiente, Lai-Chu Wu, Matthew C Young, William L Willis, Stacy Ardoin, Sudha Agarwal, Brad Bolon, Nicole Powell, John Sheridan, Naomi Schlesinger, Wael N Jarjour, Nicholas A Young
Daily moderate exercise (DME) and stress management are underemphasized in the care of patients with lupus nephritis (LN) due to a poor comprehensive understanding of their potential roles in controlling the inflammatory response. To investigate these effects on murine LN, disease progression was monitored with either DME or social disruption stress (SDR) induction in NZM2410/J mice, which spontaneously develop severe, early-onset LN. SDR of previously established social hierarchies was performed daily for 6 days and DME consisted of treadmill walking (8...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28487790/delayed-manifestation-of-shunt-nephritis-a-case-report-and-review-of-the-literature
#8
Michael Babigumira, Benjamin Huang, Sherry Werner, Wajeh Qunibi
We present an unusual case of shunt nephritis in a 39-year-old male who presented 21 years after placement of a ventriculoperitoneal (VP) shunt. He complained of fevers, headaches, dizziness, and urticarial plaques on arms, trunks, and legs and was found to have anemia, low complement levels, elevated serum creatinine, proteinuria, and new onset microhematuria. Blood and urine cultures were negative. Renal biopsy showed features of acute tubulointerstitial nephritis attributed to vancomycin use. Glomeruli showed increased mesangial hypercellularity and segmental endocapillary proliferation...
2017: Case Reports in Nephrology
https://www.readbyqxmd.com/read/28481947/brugia-malayi-microfilariae-adhere-to-human-vascular-endothelial-cells-in-a-c3-dependent-manner
#9
Jan-Hendrik Schroeder, David McCarthy, Tadge Szestak, Darren A Cook, Mark J Taylor, Alister G Craig, Charlotte Lawson, Rachel A Lawrence
Brugia malayi causes the human tropical disease, lymphatic filariasis. Microfilariae (Mf) of this nematode live in the bloodstream and are ingested by a feeding mosquito vector. Interestingly, in a remarkable co-evolutionary adaptation, Mf appearance in the peripheral blood follows a circadian periodicity and reaches a peak when the mosquito is most likely to feed. For the remaining hours, the majority of Mf sequester in the lung capillaries. This circadian phenomenon has been widely reported and is likely to maximise parasite fitness and optimise transmission potential...
May 8, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28480787/clinical-and-immunological-characteristics-of-150-systemic-lupus-erythematosus-patients-in-jamaica-a-comparative-analysis
#10
K C Maloney, T S Ferguson, H D Stewart, A A Myers, K De Ceulaer
Background Epidemiological studies in systemic lupus erythematosus have been reported in the literature in many countries and ethnic groups. Although systemic lupus erythematosus in Jamaica has been described in the past, there has not been a detailed evaluation of systemic lupus erythematosus patients in urban Jamaica, a largely Afro-Caribbean population. The goal of this study was to describe the clinical features, particularly disease activity, damage index and immunological features, of 150 systemic lupus erythematosus subjects...
January 1, 2017: Lupus
https://www.readbyqxmd.com/read/28477078/memory-b-cells-and-response-to-abatacept-in-rheumatoid-arthritis
#11
Pierre Gazeau, Guillermo Carvajal Alegria, Valérie Devauchelle-Pensec, Christophe Jamin, Julie Lemerle, Boutahar Bendaoud, Wesley H Brooks, Alain Saraux, Divi Cornec, Yves Renaudineau
Abatacept is a fusion protein (CTLA4-Ig) and therapeutic molecule labeled for the treatment of rheumatoid arthritis (RA). Abatacept acts both by disrupting the CD28-mediated activation of T cells and by interacting with CD80/CD86 molecules present on antigen presenting cells such as monocytes and memory B cells. Accordingly and to evaluate clinical and biological parameters associated with response to abatacept, a retrospective monocentric study was conducted in 43 patients with RA, and the clinical response was evaluated at 6 months according to EULAR response criteria...
May 5, 2017: Clinical Reviews in Allergy & Immunology
https://www.readbyqxmd.com/read/28475685/the-effect-of-c-reactive-protein-deposition-on-myocardium-with-ischaemia-reperfusion-injury-in-rats
#12
Se Jin Oh, Eun Na Kim, Chong Jai Kim, Jae-Sung Choi, Ki-Bong Kim
OBJECTIVES: We evaluated the effect of monomeric C-reactive protein (CRP) deposition on areas at risk (AAR) of myocardium with ischaemia-reperfusion injury. METHODS: Myocardial ischaemia-reperfusion injury model was produced by ligation of the left anterior descending coronary artery for 45 min followed by 45 min of reperfusion using female Sprague-Dawley rats. Tissue from non-ischaemic areas, areas at risk and infarct areas determined by Evans blue and 2,3,5-triphenyltetrazolium chloride staining was obtained from the sham group, the ischaemia-reperfusion injury without C-reactive protein (CRP) injection group (I/R only group), and the ischaemia-reperfusion injury with CRP injection group (I/R + CRP group)...
May 5, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28473832/how-escherichia-coli-circumvent-complement-mediated-killing
#13
REVIEW
Afonso G Abreu, Angela S Barbosa
Complement is a crucial arm of the innate immune response against invading bacterial pathogens, and one of its main functions is to recognize and destroy target cells. Similar to other pathogens, Escherichia coli has evolved mechanisms to overcome complement activation. It is well known that capsular polysaccharide may confer resistance to complement-mediated killing and phagocytosis, being one of the strategies adopted by this bacterium to survive in serum. In addition, proteases produced by E. coli have been shown to downregulate the complement system...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28473804/the-complement-system-a-prey-of-trypanosoma-cruzi
#14
REVIEW
Kárita C F Lidani, Lorena Bavia, Altair R Ambrosio, Iara J de Messias-Reason
Trypanosoma cruzi is a protozoan parasite known to cause Chagas disease (CD), a neglected sickness that affects around 6-8 million people worldwide. Originally, CD was mainly found in Latin America but more recently, it has been spread to countries in North America, Asia, and Europe due the international migration from endemic areas. Thus, at present CD represents an important concern of global public health. Most of individuals that are infected by T. cruzi may remain in asymptomatic form all lifelong, but up to 40% of them will develop cardiomyopathy, digestive mega syndromes, or both...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28470643/complement-component-c3-variant-r102g-and-the-risk-of-neovascular-age-related-macular-degeneration-in-a-tunisian-population
#15
Imen Habibi, Imen Sfar, Fedra Kort, Rim Bouraoui, Ahmed Chebil, Rim Limaiem, Saloua Ayed, Taïeb Ben Abdallah, Leila El Matri, Yousr Gorgi
Purpose To explore the association between the polymorphism (S/F) p.R102G in the complement component 3 (C3) gene and age-related macular degeneration (AMD) in a Tunisian population. Methods The molecular study was performed by polymerase chain reaction using sequence-specific primers (PCR-SSP) in 207 control subjects free of any eye disease (fundus normal) and 145 patients with exudative AMD. The CH50 activity and quantification of C3 and C4 have been made by technical home method and nephelometry, respectively...
April 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28462915/developmental-activities-of-the-complement-pathway-in-migrating-neurons
#16
Anna Gorelik, Tamar Sapir, Rebecca Haffner-Krausz, Tsviya Olender, Trent M Woodruff, Orly Reiner
In recent years the notion that malfunctioning of the immune system may result in developmental brain diseases has emerged. However, the role of immune molecules in the developing brain has not been well explored. The complement pathway converges to cleave C3. Here we show that key proteins in the lectin arm of this pathway, MASP1, MASP2 and C3, are expressed in the developing cortex and that neuronal migration is impaired in knockout and knockdown mice. Molecular mimics of C3 cleavage products rescue the migration defects that have been seen following knockdown of C3 or Masp2...
May 2, 2017: Nature Communications
https://www.readbyqxmd.com/read/28454818/plasma-immune-protein-analysis-in-the-orange-spotted-grouper-epinephelus-coioides-evidence-for-altered-expressions-of-immune-factors-associated-with-a-choline-supplemented-diet
#17
Ya-Li Shiu, Kuo-Hsun Chiu, Truong-Giang Huynh, Ping-Chung Liu, Chun-Hung Liu
This study aimed to unravel the regulatory roles of choline in activating immune responses and disease resistance of the orange-spotted grouper Epinephelus coioides. Fish were fed a choline-supplemented diet at 1 g kg(-1) of feed for 30 days. Fish fed a fish meal basal diet without choline-supplement served as controls. At the end of the feeding trial, fish were challenged with Vibrio alginolyticus. Meanwhile, plasma proteomics of fish in each group were also evaluated by two-dimensional gel electrophoresis (2-DE), and differentially expressed proteins were identified by tandem mass spectrophotometry (MS/MS), then a Western blot analysis or real-time polymerase chain reaction was used to confirm differential expressions of immune-enhancing proteins...
April 25, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28450702/complement-factors-c4-and-c3-are-down-regulated-in-response-to-short-term-overfeeding-in-healthy-young-men
#18
Caroline Foghmar, Charlotte Brøns, Katrine Pilely, Allan Vaag, Peter Garred
Insulin resistance is associated with high circulating level of complement factor C3. Animal studies suggest that improper complement activation mediates high-fat-diet-induced insulin resistance. Individuals born with low birth weight (LBW) are at increased risk of developing insulin resistance. We hypothesized that high-fat overfeeding (HFO) increase circulating C3 and induce complement activation in a birth weight differential manner. Twenty LBW and 26 normal birth weight (NBW) young men were studied using a randomised crossover design...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28450168/tuning-complement-activation-and-pathway-through-controlled-molecular-architecture-of-dextran-chains-in-nanoparticle-corona
#19
Jean-Baptiste Coty, Elquio Eleamen Oliveira, Christine Vauthier
The understanding of complement activation by nanomaterials is a key to a rational design of safe and efficient nanomedicines. This work proposed a systematic study investigating how molecular design of nanoparticle coronas made of dextran impacts on mechanisms that trigger complement activation. The nanoparticles used for this work consisted of dextran-coated poly(isobutylcyanoacrylate) (PIBCA) nanoparticles have already been thoroughly characterized. Their different capacity to trigger complement activation established on the cleavage of the protein C3 was also already described making these nanoparticles good models to investigate the relation between the molecular feature of their corona and the mechanism by which they triggered complement activation...
April 24, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28447971/the-local-and-systemic-inflammatory-response-in-a-pig-burn-wound-model-with-a-pivotal-role-for-complement
#20
H Ibrahim Korkmaz, Magda M W Ulrich, Wessel N van Wieringen, Marcel Vlig, Reindert W Emmens, Klaas W Meyer, Paul Sinnige, Paul A J Krijnen, Paul P M van Zuijlen, Hans W M Niessen
In patients with burns, a massive inflammatory response is induced which negatively affects the healing process of the burn wound and additionally exerts systemic effects. An important factor herein is the complement system. Here we analyzed the effects of burns on complement and inflammatory cells both locally and systemically after burn in time in a pig burn wound model. In burned pigs, burn wound biopsies and blood were collected up to 60 days after burn. Complement in blood as well as complement and inflammatory cells in the burn wound and several organs were determined...
December 26, 2016: Journal of Burn Care & Research: Official Publication of the American Burn Association
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