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Clinical and Experimental Immunology

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https://www.readbyqxmd.com/read/28800164/b-cell-phenotypes-in-patients-with-rheumatoid-arthritis-relapsing-after-rituximab-expression-of-b-cell-activating-factor-binding-receptors-on-b-cell-subsets
#1
Elena Becerra, Inmaculada De La Torre, Maria J Leandro, Geraldine Cambridge
OBJECTIVES: Serum levels of B cell activating factor (BAFF) rise following Rituximab (RTX) therapy in patients with Rheumatoid arthritis (RA). Initiation of naïve B cell return to the periphery and autoreactive B cell expansion leading to relapse after RTX may therefore be linked to interactions between BAFF and BAFF-binding receptors (BBR). METHODS: Relationships between serum BAFF and BBR expression (BAFFR, TACI and BCMA) were determined on B cell subsets, defined using IgD/CD38...
August 11, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28779554/cytokine-responses-to-exercise-and-activity-in-patients-with-chronic-fatigue-syndrome-case-control-study
#2
L V Clark, M Buckland, G Murphy, N Taylor, V Vleck, C Mein, E Wozniak, M Smuk, P D White
Chronic fatigue syndrome (CFS) is characterized by fatigue after exertion. A systematic review suggested that transforming growth factor beta (TGF-β) concentrations are often elevated in cases of CFS when compared to healthy controls. This study attempted to replicate this finding, and investigate whether post-exertional symptoms were associated with altered cytokine protein concentrations and their RNA in CFS patients. Twenty-four patients fulfilling Centers for Disease Control criteria for CFS, but with no comorbid psychiatric disorders, were recruited from two CFS clinics in London, UK...
August 5, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28763101/relevant-genetic-polymorphisms-and-kidney-expression-of-tlr5-and-tlr9-in-lupus-nephritis
#3
Nesrine Elloumi, Raouia Fakhfakh, Olfa Abida, Lobna Ayadi, Sameh Marzouk, Hend Hachicha, Mohamed Fourati, Zouhir Bahloul, Mohamed Nabil Mhiri, Khawla Kammoun, Hatem Masmoudi
Toll-like receptor (TLR) genetic polymorphisms may modify their expression causing inflammatory disorders and influencing both susceptibility and severity of lupus erythematosus. We aim to determine whether TLR5 and TLR9 genes polymorphisms are implicated in the susceptibility to systemic lupus erythematosus (SLE) and lupus nephritis (LN) and to evaluate their expressions and distributions in renal LN patients' biopsies. The frequencies of 2 SNP in TLR9 gene and 1 in TLR5 gene was examined in 106 SLE patients (among them 37 LN patients) and in 200 matched controls by PCR-RFLP analysis...
August 1, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28763100/fungal-derived-cues-promote-ocular-autoimmunity-through-a-dectin-2-card9-mediated-mechanism
#4
Brieanna R Brown, Ellen J Lee, Paige E Snow, Emily E Vance, Yoichiro Iwakura, Naohito Ohno, Noriko Miura, Xin Lin, Gordon D Brown, Christine A Wells, Justine R Smith, Rachel R Caspi, Holly L Rosenzweig
Uveitis (intraocular inflammation) is a leading cause of vision loss. Although its etiology is largely speculative, it is thought to arise from complex genetic-environmental interactions that break immune tolerance to generate eye-specific autoreactive T cells. Experimental autoimmune uveitis (EAU), induced by immunization with the ocular antigen, interphotoceptor retinoid binding protein (IRBP), in combination with mycobacteria-containing CFA, has many clinical and histopathological features of human posterior uveitis...
August 1, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28759104/the-interplay-between-hla-b27-and-erap1-erap2-aminopeptidases-from-antiviral-protection-to-spondyloarthritis
#5
REVIEW
Carolina Vitulano, Valentina Tedeschi, Fabiana Paladini, Rosa Sorrentino, Maria Teresa Fiorillo
The human leukocyte antigen class I gene HLA-B27 is the strongest risk factor for Ankylosing Spondylitis (AS), a chronic inflammatory arthritic disorder. More recently, the Endoplasmic Reticulum Aminopeptidases (ERAP) 1 and 2 genes have been identified by genome-wide association studies (GWAS) as additional susceptibility factors. In the ER, these aminopeptidases trim the peptides to a length suitable to fit into the groove of the MHC class I molecules. Noteworthy, an epistatic interaction between HLA-B27 and ERAP1, but not between HLA-B27 and ERAP2, has been highlighted...
July 31, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28752628/intranasal-delivery-of-dexamethasone-efficiently-controls-lps-induced-murine-neuroinflammation
#6
Gabriela Meneses, Gohar Gevorkian, Alejandra Florentino, Marcel Alberto Bautista, Alejandro Espinosa, Gonzalo Acero, Georgina Díaz, Agnes Fleury, Ivan Nicolás Pérez Osorio, Adriana Del Rey, Gladis Fragoso, Edda Sciutto, Hugo Besedosky
Neuroinflammation is the hallmark of several infectious and neurodegenerative diseases. Synthetic glucocorticoids (GCs) are the first-line immunosuppressive drugs used for controlling neuroinflammation. A delayed diffusion of GCs molecules and the high systemic doses required for brain-specific targeting lead to severe undesirable effects, particularly when lifelong treatment is required. Therefore, there is an urgent need for improving this current therapeutic approach. The intranasal (IN) route is being increasingly employed for drug delivery to the brain via the olfactory system...
July 28, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28752543/exonal-switch-down-regulates-the-expression-of-cd5-on-blasts-of-acute-t-cell-leukemia
#7
Ambak Kumar Rai, Amar Singh, Ankit Saxena, Tulika Seth, Vinod Raina, Dipendra Kumar Mitra
CD5 expression and its role in acute T cell lymphoblastic leukemia (T-ALL) have not been elaborately studied so far. We observed a significant reduction in surface expression of CD5 (sCD5) on leukemic T cells compared to autologous non-leukemic T cells. In this study, we have shown the molecular mechanism regulating the expression and function of CD5 on leukemic T cells. Total 250 numbers of patients suffering from leukemia and lymphoma were immunophenotyped. Final diagnosis was based on their clinical presentation, morphological data and flowcytometry based immunophenotyping...
July 28, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28722110/renal-infiltrating-cd11c-cells-are-pathogenic-in-murine-lupus-nephritis-through-promoting-cd4-t-cell-responses
#8
Xiaofeng Liao, Jingjing Ren, Alec Reihl, Tharshikha Pirapakaran, Bharath Sreekumar, Thomas E Cecere, Christopher M Reilly, Xin M Luo
Lupus nephritis (LN) is a major manifestation of systemic lupus erythematosus (SLE) causing morbidity and mortality in 40-60% of SLE patients. The pathogenic mechanisms of LN are not completely understood. Recent studies have demonstrated the presence of various immune cell populations in lupus nephritic kidneys of both SLE patients and lupus-prone mice. These cells may play important pathogenic or regulatory roles in situ to promote or sustain LN. Here, using lupus-prone mouse models, we showed the pathogenic role of a kidney-infiltrating CD11c(+) myeloid cell population in LN...
July 19, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28714582/altered-levels-of-soluble-cd18-may-associate-immune-mechanisms-with-outcome-in-sepsis
#9
T W Kragstrup, K Juul-Madsen, S H Christiansen, X Zhang, J Krog, T Vorup-Jensen, A G Kjaergaard
The pathogenesis of sepsis involves a dual inflammatory response, with a hyperinflammatory phase followed by, or in combination with, a hypoinflammatory phase. The adhesion molecules lymphocyte function-associated antigen (LFA-1) (CD11a/CD18) and macrophage-1 (Mac-1) (CD11b/CD18) support leucocyte adhesion to intercellular adhesion molecules and phagocytosis through complement opsonization, both processes relevant to the immune response during sepsis. Here, we investigate the role of soluble (s)CD18 in sepsis with emphasis on sCD18 as a mechanistic biomarker of immune reactions and outcome of sepsis...
July 17, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28710878/6-mercaptopurine-modifies-cerebrospinal-fluid-t-cell-abnormalities-in-paediatric-opsoclonus-myoclonus-as-steroid-sparer
#10
M R Pranzatelli, E D Tate, T J Allison
The purpose of this study was to evaluate the capacity of 6-mercaptopurine (6-MP), a known immunosuppressant, to normalize cerebrospinal fluid (CSF) lymphocyte frequencies in opsoclonus-myoclonus syndrome (OMS) and function as a steroid sparer. CSF and blood lymphocytes were immunophenotyped in 11 children with OMS (without CSF B cell expansion) using a comprehensive panel of cell surface adhesion, activation and maturation markers by flow cytometry, and referenced to 18 paediatric controls. Drug metabolites, lymphocyte counts and liver function tests were used clinically to monitoring therapeutic range and toxicity...
July 15, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28708318/current-insights-into-the-role-of-human-%C3%AE-defensins-in-atopic-dermatitis
#11
REVIEW
Panjit Chieosilapatham, Hideoki Ogawa, François Niyonsaba
Antimicrobial peptides or host defense peptides are small molecules that display both antimicrobial activities and complex immunomodulatory functions to protect against various diseases. Among these peptides, the human β-defensins (hBDs) are primarily localized in epithelial surfaces, including those of the skin, where they contribute to protective barriers. In atopic dermatitis skin lesions, altered skin barrier and immune dysregulation are believed to be responsible for reduced hBD synthesis. Impaired hBD expression in the skin is reportedly the leading cause of increased susceptibility to bacterial and viral infection in patients with atopic dermatitis...
July 14, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28708268/screening-protocols-to-monitor-respiratory-status-in-primary-immunodeficiency-disease-findings-from-a-european-survey-and-subclinical-infection-working-group
#12
Stephen Jolles, Silvia Sánchez-Ramón, Isabella Quinti, Pere Soler-Palacín, Carlo Agostini, Benoit Florkin, Louis-Jean Couderc, Nicholas Brodszki, Alison Jones, Hilary Longhurst, Klaus Warnatz, Filomeen Haerynck, Andrea Matucci, Esther de Vries
Many patients with primary immunodeficiency (PID) who have antibody deficiency develop progressive lung disease due to underlying subclinical infection and inflammation. To understand how these patients are monitored we conducted a retrospective survey based on patient records of 13 PID centres across Europe, regarding the care of 1,061 adult and 178 paediatric patients with PID on IgG replacement. The most common diagnosis was common variable immunodeficiency in adults (75%), and hypogammaglobulinaemia in children (39%)...
July 14, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28708252/redundant-and-regulatory-roles-for-tlrs-in-leishmania-infection
#13
REVIEW
Prashant Chauhan, Divanshu Shukla, Debprasad Chattopadhyay, Bhaskar Saha
Toll-like receptors (TLRs) are germ-line encoded, non-clonal innate immune receptors, which are often the first receptors to recognize the molecular patterns on pathogens. Therefore, the immune response initiated by TLRs does have far-reaching consequences on the outcome of an infection. As soon as the cell surface TLRs and other receptors recognize a pathogen, the pathogen is phagocytosed. Inclusion of TLRs in the phagosome results in quicker phagosomal maturation and stronger adaptive immune response, as TLRs influence costimulatory molecules expression and determinant selection by MHC class-II and by MHC class-I for cross-presentation...
July 14, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28707750/arterial-immune-protein-expression-demonstrates-the-complexity-of-immune-responses-in-kawasaki-disease-arteritis
#14
S A Cameron, S M White, D Arrollo, S T Shulman, A H Rowley
A more complete understanding of immune-mediated damage to the coronary arteries in children with Kawasaki disease (KD) is required for improvements in patient treatment and outcomes. We recently reported the transcriptional profile of KD coronary arteritis, and in this study sought to determine protein expression of transcriptionally up-regulated immune genes in KD coronary arteries from the first 2 months after disease onset. We examined the coronary arteries of 12 fatal KD cases and 13 childhood controls for expression of a set of proteins whose genes were highly up-regulated in the KD coronary artery transcriptome: allograft inflammatory factor 1 (AIF1), interleukin 18 (IL-18), CD74, CD1c, CD20 (MS4A1), Toll-like receptor 7 (TLR-7) and Z-DNA binding protein 1 (ZBP1)...
July 14, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28707730/complement-and-contact-system-activation-in-acute-congestive-heart-failure-patients
#15
Chiara Suffritti, Eleonora Tobaldini, Riccardo Schiavon, Silvia Strada, Lorena Maggioni, Satish Mehta, Giulia Sandrone, Edgar Toschi-Dias, Marco Cicardi, Nicola Montano
BACKGROUND: Recent experimental data indicate a pathogenic role of complement activation in congestive heart failure (CHF). Aim of this study was to evaluate contact and complement systems activation in patients hospitalized for an acute episode of CHF. METHODS AND RESULTS: 42 of 80 consecutive patients admitted at our hospital with confirmed diagnosis of acute CHF were enrolled. They underwent blood sampling within 24 hours from admission (T0) and at clinical stability (T1)...
July 14, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28681919/il-9-over-expression-and-th9-polarization-in-systemic-sclerosis-patients
#16
Giuliana Guggino, Marianna Lo Pizzo, Diana Di Liberto, Aroldo Rizzo, Paola Cipriani, Piero Ruscitti, Giuseppina Candore, Maria Caterina Gambino, Guido Sireci, Francesco Dieli, Roberto Giacomelli, Giovanni Triolo, Francesco Ciccia
Th9 cells and IL-9 are involved in the pathogenesis of several autoimmune diseases. The exact role of IL-9 and Th9 cells in patients with Systemic Sclerosis (SSc) has not been yet adequately studied. IL-9, IL-9R, transcription factor PU.1 (PU.1), IL-4, thymic stromal lymphopoietin (TSLP) and TGF-β expression were assessed in skin and kidney biopsies of SSc patients and healthy controls (HC) by immunohistochemistry (IHC). The cellular source of IL-9 was also analyzed by confocal microscopy analysis. Peripheral IL-9-producing cells were also studied by flow cytometry...
July 6, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28677152/significant-augmentation-of-regulatory-t-cell-numbers-occurs-during-the-early-neonatal-period
#17
Seiichi Hayakawa, Norioki Ohno, Satoshi Okada, Masao Kobayashi
Regulatory T cells (Tregs) control immune responses by suppressing various inflammatory cells. Tregs in newborn babies may play an important role in preventing excessive immune responses during their environmental change. We examined the number and phenotype of Tregs during the neonatal period in 49 newborn babies. Tregs were characterized by flow cytometry using cord blood (CB) and peripheral blood (PB) from the early (7-8 days after birth) and late (2-4 weeks after birth) neonatal periods. CD4(+) Foxp3(+) T cells were classified into resting Tregs (CD45RA(+) Foxp3(low) ), activated Tregs (CD45RA(-) Foxp3(high) ), and newly activated T cells (CD45RA(-) Foxp3(low) )...
July 5, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28677145/nerve-growth-factor-regulation-and-production-by-macrophages-in-osteoarthritic-synovium
#18
S Takano, K Uchida, G Inoue, M Miyagi, J Aikawa, D Iwase, K Iwabuchi, T Matsumoto, M Satoh, M Mukai, A Minatani, M Takaso
Nerve growth factor (NGF) functions to modulate osteoarthritis (OA)-associated pain. Although recent studies suggest that tumour necrosis factor (TNF)-α and interleukin (IL)-1β mediate NGF activity in human synovial fibroblasts, the regulation of NGF expression in human synovial macrophages remains unclear. Here, we examined the role of macrophages in the production and regulation of synovial (SYN) NGF in osteoarthritic knee joints by examining the mRNA expression of TNF-α and IL-1β in freshly isolated CD14-positive (macrophage-rich fraction) and CD14-negative cells (fibroblast-rich fraction) in synovial tissue from OA patients by quantitative polymerase chain reaction...
July 5, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28671717/the-effect-of-il-21-and-cd4-cd25-t-cells-on-cytokine-production-of-cd4-responder-t-cells-in-patients-with-myasthenia-gravis
#19
Mahdi Alahgholi-Hajibehzad, Hacer Durmuş, Fikret Aysal, Yeşim Gülşen-Parman, Piraye Oflazer, Feza Deymeer, Güher Saruhan-Direskeneli
Impairment of the suppressive function of regulatory T (Treg) cells was reported in myasthenia gravis (MG). In this study, cytokine-related mechanisms that may lead to the defect of Treg were investigated in patients with anti-acetylcholine receptor antibody positive MG (AChR+MG). Proliferation and cytokine production of responder T (Tresp) cells in response to polyclonal activation were measured in a suppression assay. The effect of IL-21 on suppression was evaluated in vitro in co-culture. IL-21 increased the proliferation of Tresp cells in Tresp/Treg co-cultures...
July 3, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28665497/protein-and-modified-vaccinia-virus-ankara-based-influenza-virus-nucleoprotein-vaccines-are-differentially-immunogenic-in-balb-c-mice
#20
Arwen F Altenburg, Sofia E Magnusson, Fons Bosman, Linda Stertman, Rory D de Vries, Guus F Rimmelzwaan
Because of the high variability of seasonal influenza viruses and the eminent threat of influenza viruses with pandemic potential, there is great interest in the development of vaccines that induce broadly protective immunity. Most likely, broadly protective influenza vaccines are based on conserved proteins, such as nucleoprotein (NP). NP is a vaccine target of interest since it has been shown to induce cross-reactive antibody and T cell responses. Here we tested and compared various NP-based vaccine preparations for their capacity to induce humoral and cellular immune responses to influenza virus NP...
June 30, 2017: Clinical and Experimental Immunology
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