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immunology sepsis

Greg Tsang, Michael B Insel, Justin M Weis, Mary Anne M Morgan, Michael S Gough, Lauren M Frasier, Cynthia M Mack, Kathleen P Doolin, Brian T Graves, Michael J Apostolakos, Anthony P Pietropaoli
BACKGROUND: Experimental studies demonstrate beneficial immunological and hemodynamic effects of estradiol in animal models of sepsis. This raises the question whether estradiol contributes to sex differences in the incidence and outcomes of sepsis in humans. Yet, total estradiol levels are elevated in sepsis patients, particularly nonsurvivors. Bioavailable estradiol concentrations have not previously been reported in septic patients. The bioavailable estradiol concentration accounts for aberrations in estradiol carrier protein concentrations that could produce discrepancies between total and bioavailable estradiol levels...
October 21, 2016: Critical Care: the Official Journal of the Critical Care Forum
Anne M Drewry, Enyo A Ablordeppey, Ellen T Murray, Evan R Beiter, Andrew H Walton, Mark W Hall, Richard S Hotchkiss
BACKGROUND: Identifying patients in the immunosuppressive phase of sepsis is essential for development of immunomodulatory therapies. Little data exists comparing the ability of the two most well-studied markers of sepsis-induced immunosuppression, human leukocyte antigen (HLA)-DR expression and lipopolysaccharide (LPS)-induced tumor necrosis factor alpha (TNF-ɑ) production, to predict mortality and morbidity. The purpose of this study was to compare HLA-DR expression and LPS-induced TNF-ɑ production as predictors of 28-day mortality and acquisition of secondary infections in adult septic patients...
October 20, 2016: Critical Care: the Official Journal of the Critical Care Forum
Claudia Reynoso-von Drateln, Noemí Gómez-Hernández, Norma Rodríguez-Martínez, Carlos Torres-Lozano
An 81-year-old male and a 47-year-old female experienced recurrent severe bullous dermatosis secondary to an intake of drugs and alternative medicines indicated for arthralgias. The first patient had previously presented with Stevens-Johnson/toxic epidermal necrolysis (TEN) overlap syndrome in 2007 secondary to ingestion of trimethoprim/sulfamethoxazole indicated for a urinary tract infection; 6 years later, he presented with the same syndrome 2 days after ingestion of oral naproxen tablets 250 mg twice daily...
December 2016: Drug Saf Case Rep
Oscar Cirioni, Oriana Simonetti, Elisa Pierpaoli, Alessandra Barucca, Roberto Ghiselli, Fiorenza Orlando, Maria Pelloni, Maria Michela Cappelletti Trombettoni, Mario Guerrieri, Annamaria Offidani, Andrea Giacometti, Mauro Provinciali
We investigated the efficacy of colistin combined with teicoplanin or daptomycin in an experimental mouse model of multiresistant Acinetobacter baumannii infection. Animal received intraperitoneally 1ml saline containing 2×10(10)CFU of A. baumannii. Colistin, daptomycin, teicoplanin, and colistin plus daptomycin or teicoplanin were given by intraperitoneal administration 2h after bacterial challenge. A control group received sodium chloride solution. In the in vitro study A. baumannii showed to be susceptible only to colistin with MIC of 2mg/l...
September 17, 2016: Diagnostic Microbiology and Infectious Disease
Valerie Johnson, Brandy Burgess, Paul Morley, Ryan Bragg, Anne Avery, Steven Dow
Cytokine abnormalities have been described previously in dogs with varied immune mediated and inflammatory conditions such as IMHA and sepsis. The purpose of this study was to establish references ranges for cytokine levels in dogs and to compare cytokine levels in normal dogs and dogs with two common inflammatory diseases (sepsis and IMHA). We hypothesized that cytokine response profiles in dogs with sepsis would be significantly different from those in dogs with IMHA due to the very different etiologies of the two diseases...
November 1, 2016: Veterinary Immunology and Immunopathology
Susan O'Brien, Jeffrey A Jones, Steven E Coutre, Anthony R Mato, Peter Hillmen, Constantine Tam, Anders Österborg, Tanya Siddiqi, Michael J Thirman, Richard R Furman, Osman Ilhan, Michael J Keating, Timothy G Call, Jennifer R Brown, Michelle Stevens-Brogan, Yunfeng Li, Fong Clow, Danelle F James, Alvina D Chu, Michael Hallek, Stephan Stilgenbauer
BACKGROUND: The TP53 gene, encoding tumour suppressor protein p53, is located on the short arm of chromosome 17 (17p). Patients with 17p deletion (del17p) chronic lymphocytic leukaemia have poor responses and survival after chemoimmunotherapy. We assessed the activity and safety of ibrutinib, an oral covalent inhibitor of Bruton's tyrosine kinase, in relapsed or refractory patients with del17p chronic lymphocytic leukaemia or small lymphocytic lymphoma. METHODS: We did a multicentre, international, open-label, single-arm study at 40 sites in the USA, Canada, Europe, Australia, and New Zealand...
October 2016: Lancet Oncology
Fang Liu, Hong-Mei Wang, Tiansheng Wang, Ya-Mei Zhang, Xi Zhu
BACKGROUND: Thymosin α1 (Tα1) as immunomodulatory treatment is supposed to be beneficial for the sepsis patients by regulating T cell subsets and inflammatory mediators. However, limited by the small sample size and the poor study design, the persuasive power of the single clinical studies is weak. This meta-analysis aimed to investigate the impact of Tα1 on the sepsis patients. METHODS: We searched for the Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, CBM, VIP, CNKI, WANFANG, Igaku Chuo Zasshi (ICHUSHI) and Korean literature databases reporting the effects of Tα1 on outcomes in sepsis patients...
2016: BMC Infectious Diseases
Elizabeth S B Barroqueiro, Dayanna S Prado, Priscila S Barcellos, Tonicley A Silva, Wanderson S Pereira, Lucilene A Silva, Márcia C G Maciel, Rodrigo B Barroqueiro, Flávia R F Nascimento, Azizedite G Gonçalves, Rosane N M Guerra
Attalea speciosa syn Orbignya phalerata Mart. (babassu) has been used in the treatment of inflammatory and infectious diseases. Aim of the study. To investigate the antimicrobial and immunological activity of babassu mesocarp extract (EE). Material and Methods. The in vitro antimicrobial activity was evaluated by disk diffusion assay and by determination of the minimum inhibitory concentration (MIC) to Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus (MRSA)...
2016: Evidence-based Complementary and Alternative Medicine: ECAM
Yuichiro Shindo, Anja G Fuchs, Christopher G Davis, Tim Eitas, Jacqueline Unsinger, Carey-Ann D Burnham, Jonathan M Green, Michel Morre, Grant V Bochicchio, Richard S Hotchkiss
Patients with protracted sepsis develop impaired immunity, which predisposes them to acquiring secondary infections. One of the most common and lethal secondary infections is Pseudomonas aeruginosa pneumonia. Immunoadjuvant therapy is a promising approach to reverse sepsis-induced immunosuppression and improve morbidity and mortality from secondary infections. Interleukin-7 is an immunoadjuvant that improves survival in clinically relevant animal models of polymicrobial peritonitis and in fungal sepsis. This study investigated the effect of recombinant human interleukin-7 (rhIL-7) on survival in a 2-hit model of sublethal cecal ligation and puncture followed by P...
September 14, 2016: Journal of Leukocyte Biology
Hao Ou, Shangping Zhao, Yue Peng, Xuefei Xiao, Qianlu Wang, Huaizeng Liu, Xianzhong Xiao, Mingshi Yang
Mesenchymal stem cells (MSCs) have been reported to regulate the systemic inflammatory response and sepsis-induced immunologic injury pre-clinically. However, whether MSCs from different sources elicit identical effects remains to be elucidated. The present study compared the effect of bone marrow‑derived MSCs (BMSCs) and adipose tissue-derived MSCs (ADMSCs) in a murine model of lipopolysaccharide (LPS)‑induced sepsis. SPF BALB/c mice were induced with an injection of LPS (10 mg/kg; 1 mg/ml) via the tail vein...
October 2016: Molecular Medicine Reports
Alejandra Jaque, Catherina Moll-Manzur, María Teresa Dossi, Daniela Berroeta-Mauriziano, Esteban Araos-Baeriswyl, Ximena Monsalve
Ecthyma gangrenosum is an uncommon necrotizing vasculitis, in most cases secondary to sepsis by Pseudo-mona aeruginosa in immunocompromised patients. However, there have been several reports of ecthyma gangre-nosum caused by other infectious etiologies. We report an unusual case of ecthyma gangrenosum associated with methicillin-resistant Staphylococcus aureus infection in a patient without the classic immunological risk factors described in the literature.
June 2016: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
Tomoki Nishiguchi, Ichiaki Ito, Jong O Lee, Sumihiro Suzuki, Fujio Suzuki, Makiko Kobayashi
Mortality associated with Staphylococcus aureus infection remains high during the sub-acute phase of burn injury. In this study, we aimed to improve antibacterial resistance of sub-acutely burned mice through macrophage polarization. Sepsis did not develop in mice at the sub-acute phase of 5% total body surface area (TBSA) burn after being infected with methicillin-resistant S. aureus (MRSA), and M1 macrophages [IL-10(-)IL-12(+) inducible nitric oxide synthase (iNOS)(+) Mφ] were isolated from these mice. In contrast, predominantly M2b macrophages (CCL1(+)IL-10(+)IL-12(-) Mφ) were isolated from mice with>15% TBSA burn, and all of these mice died after the same MRSA infection...
September 6, 2016: Immunology and Cell Biology
Kam Tong Leung, Hugh Simon Lam, Kathy Yuen Yee Chan, Tony Sit, Raymond Pui On Wong, Jasmine Wai Sum Yu, Karen Li, Pak Cheung Ng
Preterm infants are at high risk of developing severe sepsis. Circulating hematopoietic stem and progenitor cells (HSPCs; CD45(+)CD34(+)) have been suggested to play a vital role in the host immunological defense against invading pathogens. The objectives were to investigate the regulation of circulating HSPCs in preterm infants during infection episodes, and to assess the relationship of CD45(+)CD34(+) cells with immunological mediators and differential leukocyte populations. First, we conducted a cross-sectional case-control study comparing these parameters among infected infants (n = 23), gestational and postnatal age-matched noninfected infants (n = 46), and "healthy" control (CTL) infants (n = 12)...
October 4, 2016: Stem Cells and Development
Maddison Jade Griffin, Hayley Louise Letson, Geoffrey Phillip Dobson
Innovative host-directed drug therapies are urgently required to treat sepsis. We tested the effect of small-volume 0.9% NaCl adenosine, lidocaine and Mg(2+) (ALM) bolus and 4 hour intravenous infusion on survivability in the rat model of polymicrobial sepsis over 6 days. ALM treatment led to a significant increase in survivability (88%) compared to controls (25%). Four controls died on Days 2-3 and two died on Day 5. Early death was associated with elevated plasma and lung inflammatory markers (IL-6, IL-1ß, C-reactive protein), reduced white blood cell count (WBC), hypoxemia, hypercapnia, acidosis, hyperkalemia and elevated lactate, whereas late death was associated with a massive cytokine storm, a neutrophil dominated WBC rebound/overshoot, increased lung oxidant injury, edema and persistent ischemia...
August 31, 2016: Clinical and Vaccine Immunology: CVI
Damien Restagno, Fabienne Venet, Christian Paquet, Ludovic Freyburger, Bernard Allaouchiche, Guillaume Monneret, Jeanne-Marie Bonnet, Vanessa Louzier
Sepsis is characterized by pro- and anti-inflammatory responses following infection. While inflammation is responsible for widespread organ damage, anti-inflammatory mediators lead to immunoparalysis increasing susceptibility to secondary infections (nosocomial pneumonia). We aimed to investigate the impact of bacterial load on survival and cytokine release in a two-hit murine (C57BL/6J) model of CLP followed by P. aeruginosa pneumonia. Plasmatic TNFα, IL-6, IL-10, sTNFr I and II were quantified until 13 days...
2016: PloS One
Alexandra C Bolognese, Archna Sharma, Weng-Lang Yang, Jeffrey Nicastro, Gene F Coppa, Ping Wang
Cold-inducible RNA-binding protein (CIRP) is a novel inflammatory mediator that stimulates the release of proinflammatory cytokines from macrophages in sepsis. Given the immune dysregulation that characterizes sepsis, the effect of CIRP on other immune cells is an area of increasing interest that has not yet been studied. In the present study, we hypothesized that extracellular CIRP promotes activation of T lymphocytes in the spleen during sepsis. We observed that mice subjected to sepsis by cecal ligation and puncture showed significantly higher expression of the early activation markers CD69 and CD25 at 20 h on CD4(+) splenic T cells, and significantly higher CD69 expression on CD8(+) splenic T cells compared with sham-operated controls...
August 29, 2016: Cellular & Molecular Immunology
Jinfeng Li, Lifeng Huang, Shuzhen Wang, Yongming Yao, Zhenyu Zhang
CONTEXT: High-mobility group box 1 (HMGB1) protein is a highly abundant protein that can promote the pathogenesis of inflammatory. Some experiments have demonstrated a vital role for HMGB1 to modulate the immune function of regulatory T-cells (Tregs). Astragaloside IV (AST IV), an extract from Astragalus membranaceus Moench (Leguminosae), has been shown to exert potent cardioprotective and anti-inflammatory effects. It is still unclear whether AST IV has a latent effect on the proinflammatory ability of HMGB1 with subsequent activation of Tregs in vivo...
August 26, 2016: Pharmaceutical Biology
Florian Uhle, Benjamin G Chousterman, Robert Grützmann, Thorsten Brenner, Georg F Weber
INTRODUCTION: Sepsis is a major cause of death worldwide but its orchestrating components remain incompletely understood. On the one hand, development of sepsis results from an infectious focus that cannot be controlled by the immune system, but on the other, responding immune cells that can eliminate the infection inflict damage to the host by contributing to complications such as endothelial leakage, septic shock, and multiorgan failure. AREAS COVERED: In this review we give a comprehensive overview of how sepsis occurs, which exogenous and endogenous factors might affect the immune-pathophysiological course of sepsis and finally how this knowledge translates into up-to-date definitions and therapeutic approaches...
October 2016: Expert Review of Anti-infective Therapy
Leandro A Lobo, Claudia F Benjamim, Ana Carolina Oliveira
Mammals harbor a complex gut-associated microbiota, comprising bacteria that provide immunological, metabolic and neurological benefits to the host, and contribute to their well-being. However, dysregulation of the microbiota composition, known as dysbiosis, along with the associated mucosal immune response have a key role in the pathogenesis of many inflammatory diseases, including inflammatory bowel diseases (IBDs), type 1 and type 2 diabetes, asthma, multiple sclerosis, among others. In addition, outside the gut lumen, bacteria from microbiota are the causative agent of peritoneal inflammation, abdominal sepsis and systemic sepsis...
July 2016: Clinical & Translational Immunology
Guillaume Monneret, Julie Demaret, Morgane Gossez, Elsa Reverdiau, Fabrice Malergue, Thomas Rimmelé, Fabienne Venet
OBJECTIVE: The monitoring of septic shock induced immunosuppression has been proposed to identify patients that could benefit from specific immunoadjuvant therapies. Among potential biomarkers to monitor immunological status, functional testing remains the gold standard because it directly measures the capacity of a cell population to respond to an immune challenge. We investigated a new approach in intracellular staining for flow cytometry to measure TNF (iTNF) produced in vitro by monocytes in response to LPS...
August 10, 2016: Shock
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