Abstract:
:Transforming growth factor (TGF)-beta has been shown to stimulate isotype switching to IgA in cultures of lipopolysaccharide (LPS)-stimulated B cells. The induction of isotype switching is associated with the appearance of novel germline alpha transcripts that cannot be found in cultures stimulated with LPS alone. TGF-beta also increases the steady state level of productive alpha mRNA. In order to further elucidate both the role of TGF-beta and germline transcripts in isotype switching to IgA in B cells, the mechanism responsible for the changes in alpha mRNA was investigated. The increase in alpha mRNA which does not occur until day 2 of culture continues until at least day 4. Nuclear run-on analysis demonstrated that TGF-beta does not significantly increase the rate of transcription of either germline or productive alpha mRNA after 12, 24, or 48 h of culture. However, by day 2 of culture TGF-beta increases the half-life of alpha mRNA. These findings support the idea that TGF-beta acts as a secondary signal to stimulate isotype switching to IgA in a population that has already received a signal that drives it toward IgA production. In addition these studies suggest that either the germline transcripts or processing of pre-germline alpha mRNA transcripts plays a role in targeting recombination.
journal_name
Int Immunoljournal_title
International immunologyauthors
Lebman DA,Park MJ,Hansen-Bundy S,Pandya Adoi
10.1093/intimm/6.1.113subject
Has Abstractpub_date
1994-01-01 00:00:00pages
113-9issue
1eissn
0953-8178issn
1460-2377journal_volume
6pub_type
杂志文章abstract::We have shown that the dominance of CD8+ T cells expressing TCR Vbeta17 in the adult HLA-A*0201-restricted influenza A/M1(58-66)-specific response is acquired following first antigen exposure. Despite the acquired dominance of Vbeta17+ cells, subdominant M1(58-66)-specific clones expressing non-Vbeta17+ TCR persist in...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/13.11.1383
更新日期:2001-11-01 00:00:00
abstract::Organs of transgenic pigs that express human complement regulatory proteins are under assessment as an alternative to transplantation. A major barrier to the transplantation of pig organs is the hyperacute rejection caused by pre-existing antibodies and complement. Pig cells are very susceptible to human complement, p...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/9.6.869
更新日期:1997-06-01 00:00:00
abstract::One of the characteristic features of asthma is chronic airway inflammation typically with eosinophil infiltration. Most asthmatics can be treated successfully with conventional treatment appropriate for their severity, but in some severe cases, asthma cannot be well controlled even with thorough treatment and this co...
journal_title:International immunology
pub_type: 杂志文章,评审
doi:10.1093/intimm/dxx045
更新日期:2017-07-01 00:00:00
abstract::Mice with a targeted deletion of the T-bet gene exhibit spontaneous airway hyperresponsiveness (AHR), airway inflammation, enhanced recovery of T(h)2 cytokines from bronchoalveolar lavage fluid, sub-epithelial collagen deposition and myofibroblast transformation. Here we analyze the mechanisms responsible for the chro...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxh281
更新日期:2005-08-01 00:00:00
abstract::Intracellular signaling triggered by the antigen receptor of primary B-1 (CD5+ B) lymphocytes is insufficient to bring about cell cycle progression to S phase; this appears to result from a block in signal propagation prior to the activation of protein kinase C. The present studies were undertaken to evaluate specific...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/6.7.1011
更新日期:1994-07-01 00:00:00
abstract::P-selectin is a Ca(2+)-dependent lectin that participates in leukocyte adhesion to vascular endothelium and platelets. Myeloid cells and a subset of T lymphocytes express carbohydrate ligands at the cell surface. Previously, we suggested that heat stable antigen (HSA/mouse CD24), an extensively glycosylated cell surfa...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/7.10.1557
更新日期:1995-10-01 00:00:00
abstract::Using Ia antigen-containing lipid vesicles, we investigated by stopped-flow fluorometry the requirements for helper T cell recognition and activation. When azobenzenearsonate-L-tyrosine (ABA-L-Tyr)-specific, I-Ak-restricted helper T cell hybridomas 2-45-12 were mixed with ABA-L-Tyr and purified I-Ak molecules on lipid...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/2.6.509
更新日期:1990-01-01 00:00:00
abstract:BACKGROUND:The pathogenesis of inflammatory skin disease involves the release of cytokines from keratinocytes, and one of these, IL-1β, has been previously implicated in inflammatory skin disease. T(h)17 cells, a subset of T(h) cells involved in autoimmunity and inflammation, possess IL-1β receptors and secrete cytokin...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxr110
更新日期:2012-03-01 00:00:00
abstract::House dust mite (HDM) is a common allergen of allergic asthma. Eosinophils are principal effector cells of allergic inflammation and their adhesion onto human bronchial epithelial cells is mediated by a CD18-intracellular adhesion molecule-1 (ICAM-1)-dependent interaction. We studied the effects of HDM Dermatophagoide...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxl065
更新日期:2006-08-01 00:00:00
abstract::Liver and activation-regulated chemokine (LARC)/CCL20 is expressed by surface-lining epithelial and epidermal cells, and is likely to link innate and acquired immunity by attracting immature dendritic cells, effector memory T cells and B cells via CCR6. Here we examined the mechanism of LARC expression in epithelial-t...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/13.10.1255
更新日期:2001-10-01 00:00:00
abstract::Recent studies have shown that tumor cells acquire escape mechanisms to evade host immunity in the tumor microenvironment. Two key immune checkpoint pathways mediated by immunosuppressive co-signaling, the first via programmed cell death 1 (PD-1) and PD-1 ligand 1 (PD-1/PD-L1) and the second via CTLA-4 and B7 (CTLA-4/...
journal_title:International immunology
pub_type: 杂志文章,评审
doi:10.1093/intimm/dxw020
更新日期:2016-07-01 00:00:00
abstract::CD70 and CD80 are co-stimulatory molecules which belong to the tumor necrosis factor family and the B7 family respectively. When they are co-expressed by gene-modified TS/A tumor cells, they provide an efficient protective and long-lasting T-dependent antitumor response. We first showed that when CD70 and CD80 were de...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxg038
更新日期:2003-03-01 00:00:00
abstract::The peptide motifs of two HLA molecules, B8 and DR3(17), which are associated with autoimmune diseases including myasthenia gravis, were determined from natural peptide pools using Edman degradation. The majority of HLA-B8 ligands are nonamers preferentially terminated by leucine. As a characteristic feature of the HL...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/5.10.1229
更新日期:1993-10-01 00:00:00
abstract::The Lewis rat, an inbred rat strain susceptible to several well-characterized experimental autoimmune diseases, provides a good model to study peptide-mediated immunotherapy. Peptide immunotherapy focussing on the modulation of T cell responses by interfering with TCR-peptide-MHC complex formation requires the elucida...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/9.2.281
更新日期:1997-02-01 00:00:00
abstract::The role of B7 co-stimulatory signaling in in vivo tumor rejection remains incompletely characterized. In particular, the relative competence of B7-1 (CD80) and B7-2 (CD86) to provide effective co-stimulus is not well defined, and the identification of the T cell co-stimulatory receptor that mediates B7 co-stimulation...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/10.6.791
更新日期:1998-06-01 00:00:00
abstract::During brain development, the generation of neurons and glial cells is rigorously regulated by diverse mechanisms including the immune system. Dysfunction of the developing system results in the onset of neurodevelopmental disorders and psychological disorders. Recent studies have demonstrated that the immune system i...
journal_title:International immunology
pub_type: 杂志文章,评审
doi:10.1093/intimm/dxy041
更新日期:2018-09-25 00:00:00
abstract::Adhesion molecules of the integrin family are implicated not only in leukocyte migration but also in leukocyte activation. Here we characterize the expression and function of fibronectin receptor integrins on rat mast cells. A rat basophilic leukemia cell line (RBL-2H3) and phorbol ester-stimulated rat peritoneal mast...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/7.2.251
更新日期:1995-02-01 00:00:00
abstract::In the genetic disorder ataxia telangiectasia (AT), humoral (B) and cellular (T) immunological abnormalities are frequently observed. As a consequence, AT patients are predisposed to life-threatening sinopulmonary infections. The pathogenic mechanisms remain unknown, but a role for ATM in signal transduction from memb...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/12.6.927
更新日期:2000-06-01 00:00:00
abstract::p40 was previously described as a regulatory molecule capable of inhibiting both the natural and the CD16-mediated cytotoxicity of NK cells. In this study, we analyze the effect of p40 molecule engagement on the NK cell triggering induced by activating HLA class I-specific NK receptors (NKR) or on TCR alpha beta-media...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/9.9.1271
更新日期:1997-09-01 00:00:00
abstract::MicroRNAs 125a and 125b are predicted to be able to bind to the B lymphocyte-induced maturation protein-1 (BLIMP-1) and IFN regulatory protein-4 (IRF-4) transcription factors, which are essential for plasma cell differentiation. A computational survey of the human and mouse genomes revealed that miR-125a and miR-125b ...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxq042
更新日期:2010-07-01 00:00:00
abstract::CD69, an 'activation marker' that is rapidly induced on mature T cells after stimulation through the T cell antigen receptor (TCR) was found to be expressed on approximately 10% of normal thymocytes. All of these CD69+ thymocytes express alpha beta TCR, and they include both TCRlowCD4+CD8+ and TCRhighCD4+CD8- or CD4-C...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/5.9.1139
更新日期:1993-09-01 00:00:00
abstract::Plasmid DNA vectors have been constructed with minigenes encoding a single cytotoxic T lymphocyte (CTL) epitope from either the M2 protein of respiratory syncytial virus (RSV) or from the nucleoprotein of measles virus (MV) with or without a signal sequence (also called secretory or leader sequence). Following intrade...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/10.10.1441
更新日期:1998-10-01 00:00:00
abstract::The association of celiac disease (CD) with HLA-DQ2 and HLA-DQ8 is indicative of preferential mucosal T cell recognition of gluten fragments bound to either DQ allele. We have recently identified two gluten-derived, HLA-DQ8-restricted T cell stimulatory peptides, one each from gliadin and glutenin, recognized by speci...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/12.8.1157
更新日期:2000-08-01 00:00:00
abstract::A small proportion of the sIg+ B lymphocytes in peripheral lymphoid organs [22% in spleen and 6% in lymph node (LN)] in rat carries the Thy-1 antigen. These Thy-1+ B cells represent newly formed bone marrow (BM) derived (or immature) B cells. In this study we investigated the kinetic behavior of Thy-1+ and Thy-1- B ce...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/5.7.735
更新日期:1993-07-01 00:00:00
abstract::Animal models of autoimmune diseases have been instrumental in advancing our understanding of autoimmunity in humans. Collagen-induced arthritis in mice is an autoimmune disease model of rheumatoid arthritis, which is MHC class II restricted and CD4 T cell dependent. To better understand the fundamental role of T cell...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/10.11.1613
更新日期:1998-11-01 00:00:00
abstract::Previous evidence from several laboratories suggests that CD8+ T suppressor cells may be important regulatory elements governing specific unresponsiveness of lepromatous lepromatous leprosy patients to M.leprae. To analyse the mechanism of suppression, CD8+ Ts clones were established from lesions and peripheral blood ...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/1.2.121
更新日期:1989-01-01 00:00:00
abstract::Human CD83 is a cell surface protein expressed predominantly by dendritic cells (DC) and lymphoid cells. So far, there exists no information on the function and distribution of mCD83. Here we demonstrate that mCD83 is moderately expressed on resting T cells and DC, but strongly increases in its expression on T cells f...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/12.9.1347
更新日期:2000-09-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxm132
更新日期:2008-02-01 00:00:00
abstract::Non-obese diabetic (NOD) mice that are genetically deficient in either IFN-gamma or beta chain of the IFN-gammaR develop diabetes with similar kinetics to wild-type NOD mice. In the current study, we demonstrated that treatment of IFN-gamma signaling-deficient NOD mice with cyclophosphamide (CY) not only fails to indu...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/dxn080
更新日期:2008-09-01 00:00:00
abstract::The MHC class I antigens enhance the T cell response to various mitogenic stimuli. Class I antigens co-cap and associate with the CD3 structure on these cells. The present work shows that co-aggregation of these MHC antigens with CD3 induces a sustained elevated Ca2+ response in T cells. The duration required for a 50...
journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/6.3.481
更新日期:1994-03-01 00:00:00