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Immune deficiency

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https://www.readbyqxmd.com/read/29166668/interleukin-36%C3%AE-and-il-36-receptor-signaling-mediate-impaired-host-immunity-and-lung-injury-in-cytotoxic-pseudomonas-aeruginosa-pulmonary-infection-role-of-prostaglandin-e2
#1
Tetsuji Aoyagi, Michael W Newstead, Xianying Zeng, Yuta Nanjo, Marc Peters-Golden, Mitsuo Kaku, Theodore J Standiford
Pseudomonas aeruginosa is a Gram-negative pathogen that can lead to severe infection associated with lung injury and high mortality. The interleukin (IL)-36 cytokines (IL-36α, IL-36β and IL-36γ) are newly described IL-1 like family cytokines that promote inflammatory response via binding to the IL-36 receptor (IL-36R). Here we investigated the functional role of IL-36 cytokines in the modulating of innate immune response against P. aeruginosa pulmonary infection. The intratracheal administration of flagellated cytotoxic P...
November 22, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29165208/case-report-first-coinfection-report-of-mixed-leishmania-infantum-leishmania-major-and-human-immunodeficiency-virus-acquired-immune-deficiency-syndrome-report-of-a-case-of-disseminated-cutaneous-leishmaniasis-in-iran
#2
Alireza Badirzadeh, Mehdi Mohebali, Sadaf Sabzevari, Majid Ghafoori, Kourosh Arzamani, Mohammad Seyyedin, Seyed Ahmad Hashemi
Visceral leishmaniasis, a neglected tropical disease, is the third most common opportunistic disease in immunosuppressed patients, such as those affected by the human immunodeficiency virus (HIV)/acquired immune deficiency syndrome. Although the reports have been characterized as Leishmania/HIV coinfections, the occurrence of a mixed infection by two Leishmania species in HIV-positive patients is rare. Here, we present an atypical case of disseminated cutaneous leishmaniasis (DCL) in a 26-year-old HIV-positive man...
November 20, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29163764/inhibition-of-autoimmune-th17-cell-responses-by-pain-killer-ketamine
#3
Jeong-Eun Lee, Jung-Man Lee, Young-Jun Park, Byung-Seok Kim, Young-Tae Jeon, Yeonseok Chung
Ketamine is widely used in animals and humans as a systemic anesthetic. Although several immune-modulatory functions of ketamine have been reported, the effects of ketamine on the differentiation of Th17 cell are unknown. We found that ketamine significantly diminished the frequency of IL-17-producers among CD4(+) T cells stimulated under Th17-skewing conditions. Mechanistic studies showed that ketamine had little effect on the production of Th17-inducing cytokines by dendritic cells and the proliferation of T cells in response to anti-CD3; however it significantly hampered IL-21 expression as well as STAT3 phosphorylation in T cells upon IL-6 stimulation...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29163553/ppargamma-deficiency-counteracts-thymic-senescence
#4
David Ernszt, Krisztina Banfai, Zoltan Kellermayer, Attila Pap, Janet M Lord, Judit E Pongracz, Krisztian Kvell
Thymic senescence contributes to increased incidence of infection, cancer and autoimmunity at senior ages. This process manifests as adipose involution. As with other adipose tissues, thymic adipose involution is also controlled by PPARgamma. This is supported by observations reporting that systemic PPARgamma activation accelerates thymic adipose involution. Therefore, we hypothesized that decreased PPARgamma activity could prevent thymic adipose involution, although it may trigger metabolic adverse effects...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29163546/glucose-6-phosphatase-catalytic-subunit-3-g6pc3-deficiency-associated-with-autoinflammatory-complications
#5
Anoop Mistry, Thomas Scambler, David Parry, Mark Wood, Gabriela Barcenas-Morales, Clive Carter, Rainer Doffinger, Sinisa Savic
G6PC3 deficiency typically causes severe congenital neutropenia, associated with susceptibility to infections, cardiac and urogenital abnormalities. However, here we describe two boys of Pakistani origin who were found to have G6PC3 deficiency due to c.130 C>T mutation, but who have clinical phenotypes that are typical for a systemic autoinflammatory syndrome. The index case presented with combination of unexplained fevers, severe mucosal ulcers, abdominal symptoms, and inflammatory arthritis. He eventually fully responded to anti-TNF therapy...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29163541/nucleotide-binding-oligomerization-domain-2-contributes-to-limiting-growth-of-mycobacterium-abscessus-in-the-lung-of-mice-by-regulating-cytokines-and-nitric-oxide-production
#6
Jun-Young Lee, Moo-Seung Lee, Dong-Jae Kim, Soo-Jin Yang, Sang-Jin Lee, Eui-Jeong Noh, Sung Jae Shin, Jong-Hwan Park
Mycobacterium abscessus is a prominent cause of pulmonary infection in immunosuppressed patients and those with cystic fibrosis. Nucleotide-binding oligomerization domain (NOD) 2 is a cytosolic receptor which senses a bacterial peptidoglycan component, muramyl dipeptide (MDP). Although nucleotide-binding oligomerization domain 2 (NOD2) contributes to protect host against various microbial infections, it is still unclear whether NOD2 is essential to regulate host immune responses against M. abscessus infection...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29163499/fc%C3%AE%C2%B5ri-%C3%AE-chain-negatively-modulates-dectin-1-responses-in-dendritic-cells
#7
Yi-Gen Pan, Yen-Ling Yu, Chi-Chien Lin, Lewis L Lanier, Ching-Liang Chu
The inhibitory effect of immunoreceptor tyrosine-based activation motif (ITAM)-containing adapters DAP12 and FcεRI γ-chain (FcRγ) has been found in many immune functions. Herein, we have further explored the role of these adapters in C-type lectin receptors response. We identified that FcRγ, but not DAP12, could negatively regulate the Dectin-1 responses in dendritic cells (DCs). Loss of FcRγ or both DAP12 and FcRγ enhanced the maturation and cytokine production in DCs upon Dectin-1 activation compared to normal cells, whereas DCs lacking only DAP12 showed little changes...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29163486/structure-and-diversity-of-the-rhesus-macaque-immunoglobulin-loci-through-multiple-de-novo-genome-assemblies
#8
Akshaya Ramesh, Sam Darko, Axin Hua, Glenn Overman, Amy Ransier, Joseph R Francica, Ashley Trama, Georgia D Tomaras, Barton F Haynes, Daniel C Douek, Thomas B Kepler
The rhesus macaque is a critically important animal model in biomedical research, most recently playing a key role in the development of vaccines against human immunodeficiency virus-1. Nevertheless, the immunoglobulin (Ig) loci of macaques are as yet incompletely determined and our understanding of differences between human and macaque humoral immunity remains deficient. We completed a high-coverage, high-quality whole genome sequencing and assembly project with a single rhesus macaque of Indian origin, and partial genome assemblies using genomic molecular targeting of the Ig loci in nine other rhesus macaques of Indian origin...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29163435/evolutionary-analysis-of-hiv-1-pol-proteins-reveals-representative-residues-for-viral-subtype-differentiation
#9
Shohei Nagata, Junnosuke Imai, Gakuto Makino, Masaru Tomita, Akio Kanai
RNA viruses have been used as model systems to understand the patterns and processes of molecular evolution because they have high mutation rates and are genetically diverse. Human immunodeficiency virus 1 (HIV-1), the etiological agent of acquired immune deficiency syndrome, is highly genetically diverse, and is classified into several groups and subtypes. However, it has been difficult to use its diverse sequences to establish the overall phylogenetic relationships of different strains or the trends in sequence conservation with the construction of phylogenetic trees...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29163354/diabetes-and-sepsis-risk-recurrence-and-ruination
#10
REVIEW
Lynn M Frydrych, Fatemeh Fattahi, Katherine He, Peter A Ward, Matthew J Delano
Sepsis develops when an infection surpasses local tissue containment. A series of dysregulated physiological responses are generated, leading to organ dysfunction and a 10% mortality risk. When patients with sepsis demonstrate elevated serum lactates and require vasopressor therapy to maintain adequate blood pressure in the absence of hypovolemia, they are in septic shock with an in-hospital mortality rate >40%. With improvements in intensive care treatment strategies, overall sepsis mortality has diminished to ~20% at 30 days; however, mortality continues to steadily climb after recovery from the acute event...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29161375/health-system-factors-affecting-implementation-of-integrated-management-of-childhood-illness-imci-qualitative-insights-from-a-south-african-province
#11
Himani Pandya, Wiedaad Slemming, Haroon Saloojee
The Integrated Management of Childhood Illness (IMCI) strategy has been adopted by 102 countries including South Africa, as the preferred primary health care (PHC) delivery strategy for sick children under 5 years. Despite substantial investment to support IMCI in South Africa, its delivery remains sub-optimal, with varied implementation in different settings. There is scarce research globally, and in the local context, examining the effects of health system characteristics on IMCI implementation. This study explored key determinants of IMCI delivery in a South African province, with a specific focus on health system building blocks using a health system dynamics framework...
November 17, 2017: Health Policy and Planning
https://www.readbyqxmd.com/read/29158430/characterization-of-stress-and-innate-immunity-resistance-of-wild-type-and-%C3%AE-p66-borrelia-burgdorferi
#12
Michael W Curtis, Beth L Hahn, Kai Zhang, Chunhao Li, Richard T Robinson, Jenifer Coburn
Borrelia burgdorferi is a causative agent of Lyme disease, the most common arthropod-borne disease in the United States. B. burgdorferi evades host immune defenses to establish a persistent, disseminated infection. Previous work showed that P66-deficient B. burgdorferi (Δp66) is cleared quickly after inoculation in mice. We demonstrate that Δp66 is rapidly cleared from the skin inoculation site prior to dissemination. The rapid clearance of Δp66 is not due to inherent defects in multiple properties that might affect infectivity: bacterial outer membrane integrity, motility, chemotactic response, or nutrient acquisition...
November 20, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29158417/nox2-derived-reactive-oxygen-species-control-inflammation-during-leishmania-amazonensis-infection-by-mediating-infection-induced-neutrophil-apoptosis
#13
Matheus B H Carneiro, Eric H Roma, Adam J Ranson, Nicole A Doria, Alain Debrabant, David L Sacks, Leda Q Vieira, Nathan C Peters
Reactive oxygen species (ROS) produced by NADPH phagocyte oxidase isoform (NOX2) are critical for the elimination of intracellular pathogens in many infections. Despite their importance, the role of ROS following infection with the eukaryotic pathogen Leishmania has not been fully elucidated. We addressed the role of ROS in C57BL/6 mice following intradermal infection with Leishmania amazonensis. Despite equivalent parasite loads compared with wild-type (WT) mice, mice deficient in ROS production by NOX2 due to the absence of the gp91 subunit (gp91(phox-/-)) had significantly more severe pathology in the later stages of infection...
November 20, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29158190/prevalence-of-microsatellite-instability-in-intraductal-papillary-mucinous-neoplasms-of-the-pancreas
#14
R M Lupinacci, A Goloudina, O Buhard, J B Bachet, R Maréchal, P Demetter, J Cros, A Bardier-Dupas, A Collura, P Cervera, A Scriva, S Dumont, P Hammel, A Sauvanet, C Louvet, J-R Delpéro, F Paye, J-C Vaillant, T André, J Closset, J-F Emile, J-L Van Laethem, V Jonchère, I Abd Alsamad, M Antoine, A Rodenas, J F Fléjou, N Dusetti, J Iovanna, A Duval, M Svrcek
Microsatellite instability (MSI) due to mismatch repair deficiency (dMMR) is detected in a small proportion of pancreatic ductal adenocarcinomas (PDACs). dMMR and MSI have been associated with responses of metastatic tumors, including PDACs, to immune checkpoint inhibitor therapy. We performed immunohistochemical analyses of a 445 PDAC specimens, collected from consecutive patients at multiple centers, to identify those with dMMR, based on loss of mismatch repair proteins MLH1, MSH2, MSH6, and/or PMS2. We detected dMMR in 1...
November 17, 2017: Gastroenterology
https://www.readbyqxmd.com/read/29156738/impact-of-mismatch-repair-deficiency-on-the-colorectal-cancer-immune-microenvironment
#15
Yingyi Zhang, Zhao Sun, Xinxin Mao, Huanwen Wu, Fei Luo, Xi Wu, Liangrui Zhou, Jing Qin, Lin Zhao, Chunmei Bai
Colorectal cancer patients respond inconsistently to immunotherapies, likely due to the immune microenvironments around their tumors. We analyzed the relationship between deficient mismatch repair (dMMR) and the colorectal cancer immune microenvironment to identify predictors of effective immunotherapy. Colorectal cancer patients (n=113) who had undergone surgical resection were divided into dMMR and proficient mismatch repair (pMMR) groups. The levels of immune checkpoint proteins, including programmed cell death 1 (PD-1), programmed cell death 1 ligand 1 (PD-L1), indoleamine 2,3 dioxygenase and CD8 were assessed immunohistochemically...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29156273/contribution-of-sun-exposure-to-the-vitamin-d-dose-received-by-various-groups-of-the-spanish-population
#16
Maria-Antonia Serrano
Although the harmful effects of excessive exposure to solar ultraviolet (UV) radiation are well known, the recommended dose of UV radiation is beneficial for the synthesis of vitamin D by the skin, in addition to being useful in the treatment of various illnesses and mental problems. Numerous studies have shown that vitamin D performs important functions in the human organism, such as absorbing calcium and phosphorous and contributing to the immune system, among others. Several studies have found that a high percentage of various groups of the Spanish population suffer from vitamin D deficiency, and since very few natural foods contain vitamin D, it was considered important to determine whether groups such as schoolchildren, outdoor workers and athletes, receive enough solar radiation to produce adequate levels of vitamin D in their daily activities...
November 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29155896/progesterone-impairs-antigen-non-specific-immune-protection-by-cd8-t-memory-cells-via-interferon-%C3%AE-gene-hypermethylation
#17
Yushi Yao, Hui Li, Jie Ding, Yixin Xia, Lei Wang
Pregnant women and animals have increased susceptibility to a variety of intracellular pathogens including Listeria monocytogenes (LM), which has been associated with significantly increased level of sex hormones such as progesterone. CD8 T memory(Tm) cell-mediated antigen-non-specific IFN-γ responses are critically required in the host defense against LM. However, whether and how increased progesterone during pregnancy modulates CD8 Tm cell-mediated antigen-non-specific IFN-γ production and immune protection against LM remain poorly understood...
November 20, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29154963/macrophage-scavenger-receptor-1-contributes-to-pathogenesis-of-fulminant-hepatitis-via-neutrophil-mediated-complement-activation
#18
Yuan Tang, Huifang Li, Junru Li, Yunzhi Liu, Yanli Li, Jing Zhou, Jia Zhou, Xiao Lu, Wei Zhao, Jinlin Hou, Xiang-Yang Wang, Zhengliang Chen, Daming Zuo
BACKGROUND & AIMS: The macrophage scavenger receptor 1 (Msr1, also called SRA)is a pattern recognition receptor primarily expressed on myeloid cells, playing an important role in the maintenance of immune homeostasis. Since MSR1 expression was up-regulated in the livers of patients with fulminant hepatitis (FH), we investigated the functional mechanism of Msr1 as related to FH pathogenesis. METHODS: Msr1-deficient (Msr1(-/-)) mice and their wild-type (WT) littermates were infected with mouse hepatitis virus strain-A59 (MHV-A59) to induce FH, and the levels of tissue damage, serum alanine aminotransferase (ALT), inflammatory cytokines and complement C5a were measured and compared...
November 14, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/29153154/a-100-year-review-from-ascorbic-acid-to-zinc-mineral-and-vitamin-nutrition-of-dairy-cows
#19
W P Weiss
Mineral and vitamin nutrition of dairy cows was studied before the first volume of the Journal of Dairy Science was published and is still actively researched today. The initial studies on mineral nutrition of dairy cows were simple balance experiments (although the methods available at the time for measuring minerals were anything but simple). Output of Ca and P in feces, urine, and milk was subtracted from intake of Ca and P, and if values were negative it was often assumed that cows were lacking in the particular mineral...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153065/-genotypes-of-rhinoviruses-in-children-and-adults-patients-with-acute-respiratory-tract-infections
#20
Eda Demirkan, Sevin Kırdar, Emel Ceylan, Ayşe Yenigün, İmran Kurt Ömürlü
Rhinovirus (RV) is one of the most frequent causative agent of acute respiratory tract infections in the world. The virus may cause a mild cold, as well as more serious clinical symptoms in patients with immune system deficiency or comorbidities. Rhinoviruses have been identified by molecular methods under three types: RV-A, RV-B and RV-C. In most of the cases, it was reported that RV-A and RV-C were related with lower respiratory tract infections and asthma exacerbations, while RV-B was rarely reported in lower respiratory tract infections...
October 2017: Mikrobiyoloji Bülteni
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