Search results for "Tumor necrosis factor"
showing 10 items of 849 documents
Lung CD11c+ cells from mice deficient in Epstein-Barr virus-induced gene 3 (EBI-3) prevent airway hyper-responsiveness in experimental asthma
2007
Epstein-Barr virus-induced gene (EBI)-3 codes for a soluble type 1 cytokine receptor homologous to the p40 subunit of IL-12 that is expressed by antigen-presenting cells following activation. Here, we analyzed the functional role of EBI-3 in a murine model of asthma associated with airway hyper-responsiveness (AHR) in ovalbumin-sensitized mice. Upon allergen challenge, EBI-3-/- mice showed less severe AHR, decreased numbers and degranulation of eosinophils and a significantly reduced number of VCAM-1+ cells in the lungs as compared to wild-type littermates. We thus analyzed lung CD11c+ cells before and after allergen challenge in these mice and found that before allergen challenge, lung CD1…
Melanomas resist T-cell therapy through inflammation-induced reversible dedifferentiation.
2012
Adoptive cell transfer therapies (ACTs) with cytotoxic T cells that target melanocytic antigens can achieve remissions in patients with metastatic melanomas, but tumours frequently relapse. Hypotheses explaining the acquired resistance to ACTs include the selection of antigen-deficient tumour cell variants and the induction of T-cell tolerance. However, the lack of appropriate experimental melanoma models has so far impeded clear insights into the underlying mechanisms. Here we establish an effective ACT protocol in a genetically engineered mouse melanoma model that recapitulates tumour regression, remission and relapse as seen in patients. We report the unexpected observation that melanoma…
Interleukin-7 or Interleukin-15 Enhances Survival ofMycobacterium tuberculosis-Infected Mice
2000
ABSTRACTBoth antigen-presenting cells and immune effector cells are required to effectively eradicate or containMycobacterium tuberculosis-infected cells. A variety of cytokines are involved to ensure productive “cross talk” between macrophages and T lymphocytes. For instance, infection of macrophages with mycobacteria leads to effective interleukin-7 (IL-7) and IL-15 secretion, and both cytokines are able to maintain strong cellular immune responses of α/β and γ/δ T cells. Here we show that either cytokine is able to enhance survival ofM. tuberculosis-infected BALB/c mice significantly compared to application of IL-2, IL-4, or phosphate-buffered saline (as a control). Enhanced survival cou…
Phenotype and functional changes of Vγ9/Vδ2 T lymphocytes in Behçet's disease and the effect of infliximab on Vγ9/Vδ2 T cell expansion, activation an…
2010
Introduction: Infliximab is a chimeric monoclonal antibody against tumor necrosis factor alpha (TNF-α) that has been introduced recently for Behcet's disease (BD) patients who were resistant to standard treatment. The aim of this study was to analyse the functional changes of Vγ9/Vδ2 T lymphocytes in both active and inactive disease and the effect of infliximab on Vγ9/Vδ2 T cell expansion, activation and cytotoxicity. Methods: We investigated 1) cell expansion, 2) expression of TNFRII receptor, 3) perforin and gamma interferon (IFN) content, 4) release of granzyme A (GrA) and 5) phenotype changes, in vitro and in vivo, in Vγ9/Vδ2 T lymphocytes by means of fluorescence-activated cell sorter …
Safety of anti-tumor necrosis factor-alpha therapy in patients with rheumatoid arthritis and chronic hepatitis C virus infection.
2008
The prevalence of concurrent rheumatoid arthritis (RA) and hepatitis C virus (HCV) infection is probably underestimated because of the increasing spread of this virus worldwide, especially in developing countries. In these patients, anti-tumor necrosis factor-alpha (anti-TNF-alpha) therapy may aggravate hepatitis and increase viremia. We evaluated the safety of these treatments, which remain controversial.Thirty-one HCV-positive patients (23 women, 8 men, mean age 59+/-13 yrs, mean disease duration 13+/-11.5 SD yrs) with active RA [Disease Activity Score 28 (DAS28)3.2] unresponsive to conventional therapies were treated with TNF-alpha blockers (infliximab 11, etanercept 17, adalimumab 3) at…
A double-negative (IgD−CD27−) B cell population is increased in the peripheral blood of elderly people
2009
The T cell branch of the immune system has been extensively studied in the elderly and it is known that the elderly have impaired immune function, mainly due to the chronic antigenic load that ultimately causes shrinkage of the T cell repertoire and filling of the immunologic space with memory T cells. In the present paper, we describe the IgD(-)CD27(-) double-negative B cell population which (as we have recently described) is higher in the elderly. Most of these cells were IgG(+). Evaluation of the telomere length and expression of the ABCB1 transporter and anti-apoptotic molecule, Bcl2, shows that they have the markers of memory B cells. We also show that these cells do not act as antigen…
Trafficking phenotype and production of granzyme B by double negative B cells (IgG(+)IgD(-)CD27(-)) in the elderly.
2013
The impairment of humoral immune response in elderly humans has been extensively demonstrated. We have reported the increase of memory B cells (IgG(+)IgD(-)CD27(-), double negative, DN) population in the elderly, in which there is also a typical inflammatory micro-environment. In order to evaluate whether this pro-inflammatory status could influence the trafficking phenotype of naïve/memory B cells, we have assessed the expression of CCR7, CCR6, CXCR3, CXCR4, CXCR5 and CD62L on naïve/memory B cell subpopulations in young and elderly subjects. Moreover, the combination of pro-inflammatory interleukin-21 (IL-21) and B cell receptor (BCR) stimulation enables B cells to produce and secrete gran…
Modulation of adipokines and cytokines in gestational diabetes and macrosomia.
2006
Abstract Context/Objective: Not much is known about the implication of adipokines and different cytokines in gestational diabetes mellitus (GDM) and macrosomia. The purpose of this study was to assess the profile of these hormones and cytokines in macrosomic babies, born to gestational diabetic women. Design/Subjects: A total of 59 women (age, 19–42 yr) suffering from GDM with their macrosomic babies (4.35 ± 0.06 kg) and 60 healthy age-matched pregnant women and their newborns (3.22 ± 0.08 kg) were selected. Methods: Serum adipokines (adiponectin and leptin) were quantified using an obesity-related multiple ELISA microarray kit. The concentrations of serum cytokines were determined by ELISA…
Predictors of insulin resistance in patients with obesity: a pilot study.
2012
We compared adipokines and inflammatory markers in obese insulin-sensitive (group A, n = 16) and insulin-resistant (group B, n = 48) patients divided according to homeostasis model assessment of insulin resistance (HOMA-IR). Serum levels of adiponectin, leptin, resistin, high-sensitivity C-reactive protein, interleukin 6, and tumor necrosis factor α were measured. Weight, height, waist (WC) and hip circumferences, waist to hip ratio , weight to height ratio, visceral adiposity index (VAI), and body adiposity index (BAI) were measured. The WC and VAI were significantly higher in group B (113.9 ± 11.1 vs 105.3 ± 9.8cm; P < .01 and 2.3 ± 1.1 vs 1.6 ± 0.9; P < .05, respectively), while s…
In renal transplanted patients inflammation and oxidative stress are interrelated.
2006
Introduction: The inflammatory state plays a well-documented role to cause oxidative stress, especially in end-stage renal disease (ESRD) patients, wherein several cardiovascular risk factors are amplified by the coexistence of a microinflammatory state with increased oxidative stress. Methods: We measured serum concentrations of high sensitivity C-reactive protein (CRP), tumor necrosis factor α (TNFα), 8-iso-prostaglandin F2α (8-iso-PGF2α-in vivo oxidative stress marker) in 15 chronic renal failure (CRF) and 15 transplant patients versus 15 healthy controls. Exclusion criteria were: age 65 years as well as a diagnosis of diabetes or cardiovascular diseases. We evaluated systolic (SBP) and …