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İnfection immunology

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https://www.readbyqxmd.com/read/29235226/reduced-therapeutic-effect-of-antiviral-drugs-in-patients-with-hepatitis-b-virus-reactivation-after-hematopoietic-stem-cell-transplantation
#1
Masamichi Kimura, Koji Nishikawa, Hisashi Sakamaki, Masashi Mizokami, Kiminori Kimura
BACKGROUND: Patients with resolved Hepatitis B virus (HBV) infection following hematopoietic stem cell transplantation (HSCT) are potentially at high risk of HBV reactivation. Although anti-viral drug therapy is recommended when HBV DNA reappears in the serum, drug efficacy after HBV reactivation remains unclear. METHODS: Host immune response against HBV was investigated via immunological analyses at 12 months after entecavir (ETV) treatment in six HSCT-treated and five non-HSCT-treated patients with HBV reactivation, and 18 patients with chronic hepatitis B (CHB)...
December 13, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/29234318/leprosy-as-a-complex-infection-breakdown-of-the-th1-and-th2-immune-paradigm-in-the-immunopathogenesis-of-the-disease
#2
REVIEW
Jorge Rodrigues de Sousa, Mirian Nacagami Sotto, Juarez Antonio Simões Quaresma
Leprosy is a chronic infectious disease whose evolution involves complex immune mechanisms of the host that influence the clinical presentation of the disease. For many years, the main interpretation of the host defense response was based on characterization of the established immune paradigm between T helper (Th) 1 and Th2 lymphocytes. However, with advances in the knowledge of immunology, new approaches have emerged along with the development of new immunological pathways that have changed the interpretation of the long-established paradigm of the polar forms of the disease, especially with the identification of new subtypes of T lymphocytes such as Th9, Th17, Th22, and Tregs...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29233577/infections-in-children-on-biologics
#3
REVIEW
Lara Danziger-Isakov
Biologics target various pathways to modify immunologic activity. Biologic use to treat pediatric patients continues to expand; but limited data exist regarding infectious complications of these agents, especially for newer agents. Infectious events reported in the literature for pediatric patients indicate that a variety of bacterial, mycobacterial, viral, and fungal infections can occur. Further pediatric-specific reports are needed to fill knowledge gaps in the complications related to these agents.
December 9, 2017: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/29232699/cxcr4-blockade-decreases-cd4-t-cell-exhaustion-and-improves-survival-in-a-murine-model-of-polymicrobial-sepsis
#4
Kimberly M Ramonell, Wenxiao Zhang, Annette Hadley, Ching-Wen Chen, Katherine T Fay, John D Lyons, Nathan J Klingensmith, Kevin W McConnell, Craig M Coopersmith, Mandy L Ford
Sepsis is a dysregulated systemic response to infection involving many inflammatory pathways and the induction of counter-regulatory anti-inflammatory processes that results in a state of immune incompetence and can lead to multi-organ failure. CXCR4 is a chemokine receptor that, following ligation by CXCL12, directs cells to bone marrow niches and also plays an important role in T cell cosignaling and formation of the immunological synapse. Here, we investigated the expression and function of CXCR4 in a murine model of polymicrobial sepsis...
2017: PloS One
https://www.readbyqxmd.com/read/29232563/immunologic-burden-links-periodontitis-to-acute-coronary-syndrome
#5
John M Liljestrand, Susanna Paju, Milla Pietiäinen, Kåre Buhlin, G Rutger Persson, Markku S Nieminen, Juha Sinisalo, Päivi Mäntylä, Pirkko J Pussinen
BACKGROUND AND AIMS: Periodontitis, a common polymicrobial inflammatory disease in the tooth supporting tissues, is a risk factor for coronary artery disease. One of the proposed underlying mechanisms is the systemic immune response to periodontal infection. We studied how serum antibodies against seven periodontal pathogens and their subgingival levels associate with each other, periodontitis, and coronary artery disease. METHODS: The Parogene cohort included 505 Finnish patients (mean age 63 y) who underwent coronary angiography, and clinical and radiographic oral examinations...
December 6, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/29231805/understanding-host-parasite-relationship-the-immune-central-nervous-system-microenvironment-and-its-effect-on-brain-infections
#6
Laura Adalid-Peralta, Brenda Sáenz, Gladis Fragoso, Graciela Cárdenas
The central nervous system (CNS) has been recognized as an immunologically specialized microenvironment, where immune surveillance takes a distinctive character, and where delicate neuronal networks are sustained by anti-inflammatory factors that maintain local homeostasis. However, when a foreign agent such as a parasite establishes in the CNS, a set of immune defences is mounted and several immune molecules are released to promote an array of responses, which ultimately would control the infection and associated damage...
December 12, 2017: Parasitology
https://www.readbyqxmd.com/read/29230335/a-case-of-ignatzschineria-indica-bacteremia-following-maggot-colonization
#7
Hugh Muse, Rachel L Jenkins, Meredith B Oliver, Soomin Kim, Richard L Grantier, Bharat K Malhotra, Jason J Parham, Kayla R Stover
Ignatzschineria indica is a Gram-negative bacterium that is commonly associated with the larvae of flesh flies. I. indica is difficult to isolate in routine laboratory procedures but has been associated with neglected wounds infested with maggots, fever, elevated white blood count and C-reactive protein, and polymicrobial culture results. Other specific hematological/immunological changes are not known. We present a case of I. indica bacteremia and polymicrobial osteomyelitis resulting from infected decubitus ulcers...
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/29230217/type-i-interferons-in-the-pathogenesis-of-tuberculosis-molecular-drivers-and-immunological-consequences
#8
REVIEW
Meg L Donovan, Thomas E Schultz, Taylor J Duke, Antje Blumenthal
Tuberculosis (TB) remains a major global health threat. Urgent needs in the fight against TB include improved and innovative treatment options for drug-sensitive and -resistant TB as well as reliable biological indicators that discriminate active from latent disease and enable monitoring of treatment success or failure. Prominent interferon (IFN) inducible gene signatures in TB patients and animal models of Mycobacterium tuberculosis infection have drawn significant attention to the roles of type I IFNs in the host response to mycobacterial infections...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29230211/evaluation-of-aggregated-ag85b-antigen-for-its-biophysical-properties-immunogenicity-and-vaccination-potential-in-a-murine-model-of-tuberculosis-infection
#9
Faraz Ahmad, Swaleha Zubair, Pushpa Gupta, Umesh Datta Gupta, Rakesh Patel, Mohammad Owais
Protein aggregates have been reported to act as a reservoir that can release biologically active, native form of precursor protein. Keeping this fact into consideration, it is tempting to exploit protein aggregate-based antigen delivery system as a functional vaccine to expand desirable immunological response in the host. Herein, we explored the capacity of aggregated Ag85B of Mycobacterium tuberculosis (Mtb) to act as a prophylactic vaccine system that releases the precursor antigen in slow and sustained manner...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29229844/cytokine-signaling-through-drosophila-mthl10-ties-lifespan-to-environmental-stress
#10
Eui Jae Sung, Masasuke Ryuda, Hitoshi Matsumoto, Outa Uryu, Masanori Ochiai, Molly E Cook, Na Young Yi, Huanchen Wang, James W Putney, Gary S Bird, Stephen B Shears, Yoichi Hayakawa
A systems-level understanding of cytokine-mediated, intertissue signaling is one of the keys to developing fundamental insight into the links between aging and inflammation. Here, we employed Drosophila, a routine model for analysis of cytokine signaling pathways in higher animals, to identify a receptor for the growth-blocking peptide (GBP) cytokine. Having previously established that the phospholipase C/Ca2+ signaling pathway mediates innate immune responses to GBP, we conducted a dsRNA library screen for genes that modulate Ca2+ mobilization in Drosophila S3 cells...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29229731/activation-of-porcine-alveolar-macrophages-by-actinobacillus-pleuropneumoniae-lipopolysaccharide-via-the-tlr4-nf-%C3%AE%C2%BAb-mediated-pathway
#11
Bi Li, Jing Fang, Zhicai Zuo, Sirui Yin, Tingting He, Mingxian Yang, Junliang Deng, Liuhong Shen, Xiaoping Ma, Shumin Yu, Ya Wang, Zhihua Ren
Actinobacillus pleuropneumoniae (A. pleuropneumoniae) is a causative agent of the porcine contagious pleuropneumonia. Overproduction of pro-inflammatory cytokines like IL-1β, IL-6, TNF-α and Resistin in lung is an important feature of A. pleuropneumoniae infection. These pro-inflammatory cytokines enhance inflammatory and immunological responses. However, the mechanism that leads to cytokines production remains unclear. As a major virulent factor of A. pleuropneumoniae, lipopolysaccharide (LPS) may act as a potent stimulator of TLR4, triggering a number of intracellular signaling pathways that lead to synthesis of pro-inflammatory cytokines...
December 11, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29229676/teleost-specific-tlr19-localizes-to-endosome-recognizes-dsrna-recruits-trif-triggers-both-ifn-and-nf-%C3%AE%C2%BAb-pathways-and-protects-cells-from-grass-carp-reovirus-infection
#12
Jianfei Ji, Youliang Rao, Quanyuan Wan, Zhiwei Liao, Jianguo Su
TLRs are pivotal pattern recognition receptors in initiating innate immunity and triggering adaptive immunity. TLR pathways have been comprehensively investigated in mammals. However, the teleost-specific TLR19 pathway remains largely unknown. In this study, we identified TLR19 from grass carp (Ctenopharyngodon idella), and explored the ligand, adaptor, and signaling pathways. Pathogen-associated molecular pattern binding and luciferase activity assays indicate that TLR19 recognizes and responds to dsRNA analog (polyinosinic:polycytidylic acid)...
December 11, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29229442/quantitative-analysis-of-tnf-%C3%AE-il-4-and-il-10-expression-nitric-oxide-response-and-apoptosis-in-encephalitozoon-cuniculi-infected-rabbits
#13
Alicia M Nevárez-Garza, Uziel Castillo-Velázquez, Adolfo Soto-Domínguez, R Montes-de-Oca-Luna, Diana E Zamora-Ávila, Alfredo Wong-González, Luis E Rodríguez-Tovar
The expression of tumor necrosis factor (TNF) -α, interleukin (IL) -4 and IL-10, as well as apoptosis and nitric oxide (NO) levels were measured in the brain and kidneys of immunocompetent and immunosuppressed New Zealand White rabbits infected with Encephalitozoon cuniculi. All of the animals had clinical signs histopathological lesions compatible with encephalitozoonosis and were E. cuniculi-positive by using a carbon immunoassay test. Encephalitozoon cuniculi infection promoted the expression of TNF-α and NO production in the kidneys of infected rabbits, and a synergic effect was observed in animal treated with dexamethasone...
December 8, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29229361/a-literature-review-on-maternal-fetal-and-reproductive-disorders-of-toxoplasma-gondii-infection
#14
REVIEW
Shirzad Fallahi, Ali Rostami, Malihe Nourollahpour Shiadeh, Hamed Behniafar, Shahrokh Paktinat
BACKGROUND: Toxoplasma gondii infection is one of the most prevalent infectious disease with worldwide distribution. Congenital toxoplasmosis is annually responsible for 1.20 million disability-adjusted life years around the world, but often it is overlooked many countries. METHODS: We performed an updated review to summarize the current researches on fetal, neonatal and maternal consequences of T. gondii infection and also adverse effects of toxoplasmosis on women reproductive organs...
December 8, 2017: Journal of Gynecology Obstetrics and Human Reproduction
https://www.readbyqxmd.com/read/29229171/special-considerations-in-pediatric-kidney-transplantation
#15
REVIEW
Sean A Hebert, Rita D Swinford, David R Hall, Jason K Au, John S Bynon
Universally accepted as the treatment of choice for children needing renal replacement therapy, kidney transplantation affords children the opportunity for an improved quality of life over dialysis therapy. Immunologic and surgical advances over the last 15 years have improved the pediatric patient and kidney graft survival. Unique to pediatrics, congenital genitourinary anomalies are the most common primary diseases leading to kidney failure, many with urological issues. Early urological evaluation for post-transplant bladder dysfunction and emphasis on immunization adherence are the mainstays of pediatric pretransplant and post-transplant evaluations...
November 2017: Advances in Chronic Kidney Disease
https://www.readbyqxmd.com/read/29228218/nonhuman-primate-models-and-understanding-the-pathogenesis-of-hiv-infection-and-aids
#16
Ronald S Veazey, Andrew A Lackner
Research using nonhuman primates (NHPs) as models for human immunodeficiency virus (HIV) infection and acquired immunodeficiency syndrome (AIDS) has resulted in tremendous achievements not only in the prevention and treatment of HIV, but also in biomedical research more broadly. Once considered a death sentence, HIV infection is now fairly well controlled with combination antiretroviral treatments, almost all of which were first tested for efficacy and safety in nonhuman primates or other laboratory animals...
December 8, 2017: ILAR Journal
https://www.readbyqxmd.com/read/29228130/acute-retroviral-syndrome-is-associated-with-high-viral-burden-cd4-depletion-and-immune-activation-in-systemic-and-tissue-compartments
#17
Trevor A Crowell, Donn J Colby, Suteeraporn Pinyakorn, James L K Fletcher, Eugène Kroon, Alexandra Schuetz, Shelly J Krebs, Bonnie M Slike, Louise Leyre, Nicolas Chomont, Linda L Jagodzinski, Irini Sereti, Netanya S Utay, Robin Dewar, Rungsun Rerknimitr, Nitiya Chomchey, Rapee Trichavaroj, Victor G Valcour, Serena Spudich, Nelson L Michael, Merlin L Robb, Nittaya Phanuphak, Jintanat Ananworanich
Background: Many individuals with acute HIV infection (AHI) experience acute retroviral syndrome (ARS), which is associated with adverse long-term clinical outcomes. We characterized clinical, virologic, and immunologic features of ARS and described the impact of early antiretroviral therapy (ART) initiation. Methods: Participants presenting for voluntary HIV testing were enrolled during AHI in Bangkok, Thailand. ARS was defined by ≥3 qualifying signs/symptoms...
December 7, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29228007/conjugation-of-nitrated-acetaminophen-to-der-p1-amplifies-peripheral-blood-monocyte-response-to-der-p1
#18
Ryan G Thomas, Brenda M Rivera Reyes, Benjamin M Gaston, Nelki B Rivera Acosta, Ilya R Bederman, Laura A Smith, Morgan T Sutton, Benlian Wang, John F Hunt, Tracey L Bonfield
BACKGROUND: An association of acetaminophen use and asthma was observed in the International Study of Asthma and Allergies in Childhood study. However there are no clear mechanisms to explain an association between acetaminophen use and immunologic pathology. In acidic conditions like those in the stomach and inflamed airway, tyrosine residues are nitrated by nitrous and peroxynitrous acids. The resulting nitrotyrosine is structurally similar to 2,4-dinitrophenol and 2,4-dinitrochlorobenzene, known haptens that enhance immune responses by covalently binding proteins...
2017: PloS One
https://www.readbyqxmd.com/read/29226301/the-2017-iuis-phenotypic-classification-for-primary-immunodeficiencies
#19
Aziz Bousfiha, Leïla Jeddane, Capucine Picard, Fatima Ailal, H Bobby Gaspar, Waleed Al-Herz, Talal Chatila, Yanick J Crow, Charlotte Cunningham-Rundles, Amos Etzioni, Jose Luis Franco, Steven M Holland, Christoph Klein, Tomohiro Morio, Hans D Ochs, Eric Oksenhendler, Jennifer Puck, Mimi L K Tang, Stuart G Tangye, Troy R Torgerson, Jean-Laurent Casanova, Kathleen E Sullivan
Since the 1990s, the International Union of Immunological Societies (IUIS) PID expert committee (EC), now called Inborn Errors of Immunity Committee, has published every other year a classification of the inborn errors of immunity. This complete catalog serves as a reference for immunologists and researchers worldwide. However, it was unadapted for clinicians at the bedside. For those, the IUIS PID EC is now publishing a phenotypical classification since 2013, which proved to be more user-friendly. There are now 320 single-gene inborn errors of immunity underlying phenotypes as diverse as infection, malignancy, allergy, auto-immunity, and auto-inflammation...
December 11, 2017: Journal of Clinical Immunology
https://www.readbyqxmd.com/read/29226173/long-term-outcome-of-antiretroviral-treatment-in-patients-with-and-without-concomitant-tuberculosis-receiving-health-center-based-care-results-from-a-prospective-cohort-study
#20
Anton Reepalu, Taye Tolera Balcha, Erik Sturegård, Patrik Medstrand, Per Björkman
Background: In order to increase treatment coverage, antiretroviral treatment (ART) is provided through primary health care in low-income high-burden countries, where tuberculosis (TB) co-infection is common. We investigated the long-term outcome of health center-based ART, with regard to concomitant TB. Methods: ART-naïve adults were included in a prospective cohort at Ethiopian health centers and followed for up to 4 years after starting ART. All participants were investigated for active TB at inclusion...
2017: Open Forum Infectious Diseases
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