Abstract:
:We studied the competitive repopulation by different B cells of irradiated mice reconstituted with bone marrow from either congenic or Ig-transgenic (TG) mice mixed at different ratios. We found that after reconstitution, the number of B cells recovered in the different chimeras is similar and independent of the ratio of injected cells. In chimeras hosting TG and non-TG cells, the relative representation of the donor cell lineages diverges from the ratios present in the inoculum, i.e. at the periphery, non-TG cells are preferentially selected. Selection of non-TG cells only occurs when population growth plateaus, i.e. when resources become limiting and competition starts to operate. Selection of non-TG cells depends on surface Ig expression, and they are selected because they have a longer survival. Finally, the life-expectancy of the same B cell population differs depending upon the second population present. The present results show that the life-span and the population size of each B cell clone can be altered (interfered with) by the presence of a second cell population, demonstrating the existence of cellular competition among B cells. Our findings establish the role of cellular competition in the selection of B cell repertoires and the existence of a hierarchy of B cell selection in the absence of antigenic stimulation. The implications of cellular competition on our understanding of the immune system are discussed.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Freitas AA,Rosado MM,Viale AC,Grandien Adoi
10.1002/eji.1830250636subject
Has Abstractpub_date
1995-06-01 00:00:00pages
1729-38issue
6eissn
0014-2980issn
1521-4141journal_volume
25pub_type
杂志文章abstract::Mouse thymus-leukemia antigen (TL), like other major histocompatibility complex (MHC) class I-b antigens, displays signs of a specialized function. It is normally expressed at high levels on immature thymocytes and at moderate levels on gut epithelium and activated mature T cells. A promoter/enhancer region unique amo...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830250421
更新日期:1995-04-01 00:00:00
abstract::Dopamine by itself has not up to now been reported to activate T cell function. We show here that dopamine interacts directly with dopaminergic receptors on normal human T cells and triggers beta1 integrin-mediated T cell adhesion to a major extracellular matrix component, fibronectin (FN). Such adhesion is a characte...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200112)31:12<3504::aid-immu3504>
更新日期:2001-12-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200211)32:11<3102::AID-IMMU3102>
更新日期:2002-11-01 00:00:00
abstract::Cells expressing the chemoattractant receptor-homologous molecule expressed on Th2 cells (CRTH2) and the chemokine C receptor (CCR)4 were consistently detected in the circulation of healthy subjects, whereas numbers of cells expressing CCR3 were much lower. While all CCR4+ cells were T cells, a small proportion of CRT...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200010)30:10<2972::AID-IMMU2972>
更新日期:2000-10-01 00:00:00
abstract::Treatment of systemic lupus erythematosus patients with epratuzumab (Emab), a humanized monoclonal antibody targeting CD22, leads to moderately reduced B-cell numbers but does not completely deplete B cells. Emab appears to induce immunomodulation of B cells, but the exact mode of action has not been defined. In the p...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201646383
更新日期:2016-09-01 00:00:00
abstract::Hybrid virus-like particles (VLP) were prepared by self-assembly of the modified porcine parvovirus (PPV) VP2 capsid protein carrying a CD8+ or CD4+ T cell epitope. Immunization of mice with a single dose of these hybrid pseudo-particles, without adjuvant, induced strong cytotoxic T lymphocyte and T helper (Th) respon...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/(SICI)1521-4141(199804)28:04<1401::AID-IMM
更新日期:1998-04-01 00:00:00
abstract::Sequential development of antibody titer, functional avidity, helper and suppressor activities were investigated in rhesus monkeys. These were immunized with a single dose of 0.1 microgram to 10 mg of a streptococcal protein antigen (SA) in aluminium hydroxide. The IgG antibody titers followed the classical pattern fi...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830140909
更新日期:1984-09-01 00:00:00
abstract::Checkpoint blockade of CTLA-4 results in long-lasting survival benefits in metastatic cancer patients. However, patients treated with CTLA-4 blockade have suffered from immune-related adverse events, most likely due to the breadth of the induced T-cell activation. Here, we investigated the efficacy of a local low-dose...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201646583
更新日期:2017-02-01 00:00:00
abstract::Peptides associated with HLA-B35 commonly have a proline or occasionally a serine residue in the P2 anchor position of the peptide, with a tyrosine at the C terminus. Based on this motif, we identified an octamer epitope from influenza A matrix protein which is presented by HLA-B35. The requirements for MHC binding an...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830260210
更新日期:1996-02-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/(SICI)1521-4141(199904)29:04<1228::AID-IMM
更新日期:1999-04-01 00:00:00
abstract::Natural killer (NK) cells play an important role in early defense against viral infection. The cytotoxic activity of NK cells is increased by interferon-alpha/beta (IFN-alpha/beta), produced en masse in virally infected cells. However, the mechanism(s) by which IFN-alpha/beta contribute to the NK-cell-mediated antivir...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200111)31:11<3138::aid-immu3138>
更新日期:2001-11-01 00:00:00
abstract::Multi-component glycopeptide libraries and single glycopeptides were used for immunization of mice with the aim of inducing strong T helper cell responses to the repetitive sequence of MUC1 expressed by human tumor cells. The glycopeptides and glycopeptide libraries were modeled upon the native human MUC1 amino acid v...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.200323698
更新日期:2003-06-01 00:00:00
abstract::A considerable fraction of T cells express two distinct T cell receptors (TCR), mainly due to expression of two TCR alpha chains. It has been suggested that such dual-TCR cells could have a role in autoimmunity. However, as such cells express less of each TCR, they could be less sensitive to their physiological ligand...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830261211
更新日期:1996-12-01 00:00:00
abstract::CD4 T cells play a central role as helper cells in adaptive immunity. Presentation of exogenous antigens in MHC class II by professional antigen-presenting cells is a crucial step in induction of specific CD4 T cells in adaptive immune responses. For efficient induction of immunity against intracellular threats such a...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201747152
更新日期:2018-10-01 00:00:00
abstract::The physical association of CD5 and the T cell antigen receptor (TcR)/CD3 complex on the surface of intact human lymphocytes was investigated using co-capping experiments and fluorescence resonance energy transfer (FRET) analyses. Antibody-induced capping of CD5 or CD3 and double indirect immunofluorescence labeling r...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830230530
更新日期:1993-05-01 00:00:00
abstract::Our understanding of the biology of human natural killer (NK) cells has significantly advanced in recent years upon identification of a family of NK cell-expressed genes that encode killer cell inhibitory receptors (KIR). Individual KIR can selectively bind various HLA class I allotypes and consequently transduce inhi...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/(SICI)1521-4141(199802)28:02<599::AID-IMMU
更新日期:1998-02-01 00:00:00
abstract::Accumulating evidence suggests that alloreactive memory T cells (Tm) may form a barrier to tolerance induction in large animals and humans due in part to a resistance to suppression by Treg. However, why Tm are resistant to regulation and how the Tm response to an allograft differs from that of naïve T cells, which ar...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201040671
更新日期:2010-11-01 00:00:00
abstract::FoxP3(+) Treg cells and anergic T cells are the two regulatory phenotypes of T-cell responses associated with helminth infection. Here, we examine the T-cell responses in mice during Fasciola hepatica infection, and to its tegumental coat antigens (FhTeg) that are shed from the fluke every 2-3 h. FhTeg comprises a ric...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201545905
更新日期:2016-05-01 00:00:00
abstract::Several studies in human patients and in laboratory animals have revealed a correlation between serum interleukin (IL)-6 levels and outcome in clinical sepsis and in related animal models, respectively. In the present study, two monoclonal antibodies were used to investigate the contribution of IL-6 in the lethal acti...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830221023
更新日期:1992-10-01 00:00:00
abstract::T-cell destiny during thymic selection depends on the affinity of the TCR for autologous peptide ligands presented in the context of MHC molecules. This is a delicately balanced process; robust binding leads to negative selection, yet some affinity for the antigen complex is required for positive selection. All TCRs o...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201242606
更新日期:2012-12-01 00:00:00
abstract::Somatic hypermutation (SH) in B cells undergoing T cell-dependent immune responses generates high-affinity antibodies that provide protective immunity. Most current models of SH postulate the introduction of a nick into the DNA and subsequent replication-independent, error-prone short-patch synthesis by one or more DN...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200211)32:11<3152::AID-IMMU3152>
更新日期:2002-11-01 00:00:00
abstract::Human ILCs are classically categorized into five subsets; cytotoxic CD127- CD94+ NK cells and non-cytotoxic CD127+ CD94- , ILC1s, ILC2s, ILC3s, and LTi cells. Here, we identify a previously unrecognized subset within the CD127+ ILC population, characterized by the expression of the cytotoxic marker CD94. These CD94+ I...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.202048696
更新日期:2020-12-09 00:00:00
abstract::Recent years have seen a dramatic increase in the range of applications of virus-like nanoparticle (VNP)- and liposome-based antigen delivery systems for the treatment of allergies. These platforms rely on a growing number of inert virus-backbones or distinct lipid formulations and intend to engage the host's innate a...
journal_title:European journal of immunology
pub_type: 杂志文章,评审
doi:10.1002/eji.201847810
更新日期:2020-01-01 00:00:00
abstract::Fever is associated with improved survival during infection in endothermic and ectothermic species although the protective mechanisms are largely undefined. Previous studies indicate that fever-range thermal stress increases the binding activity of the L-selectin homing receptor in human or mouse leukocytes, thereby p...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.200636421
更新日期:2007-10-01 00:00:00
abstract::Cytotoxic T lymphocytes (CTL) and natural killer (NK) cells elaborate a cytolytic protein named perforin or cytolysin. It was widely held that, in vivo, high quantities of perforin are not present in resting lymphocytes and are usually produced only by activated lymphocytes found under pathological conditions. Until n...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830230907
更新日期:1993-09-01 00:00:00
abstract::Although the role of interleukin 2 (IL 2) in mature T lymphocyte function is well documented, its effect on hematopoietic progenitor cells is less well characterized. Here we have used recombinant retroviruses to transduce and express a cDNA clone encoding the p55 component of the human IL 2 receptor (h-p55), in a mur...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830200317
更新日期:1990-03-01 00:00:00
abstract::NK cells are rapid IFN-γ responders to Plasmodium falciparum-infected erythrocytes (PfRBC) in vitro and are involved in controlling early parasitaemia in murine models, yet little is known about their contribution to immune responses following malaria infection in humans. Here, we studied the dynamics of and requireme...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201040587
更新日期:2010-12-01 00:00:00
abstract::Antigen-specific human T lymphocytes were selected by adsorption of peripheral blood mononuclear cells on monolayers of antigen-treated autologous monocytes. The enriched cell populations were propagated in interleukin 2-containing medium for 60-80 days. Their activity was tested by a proliferative response against th...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830131116
更新日期:1983-11-01 00:00:00
abstract::Listeria monocytogenes (LM) is a foodborne Gram-positive intracellular pathogen that can cause listeriosis in humans and animals. Although phagocytes are known to be involved in the response to this infection, the role of neutrophils is not entirely clear. Here, we have demonstrated that soon after LM infection, a lar...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201847491
更新日期:2018-09-01 00:00:00
abstract::In the lung, dendritic cells (DC) are key antigen-presenting cells capable of triggering specific cellular responses to inhaled pathogens, and thus, they may be important in the initiation of an early response to mycobacterial infections. The ability of DC to enhance antigen presentation to naive T cells within the lu...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/(SICI)1521-4141(199906)29:06<1972::AID-IMM
更新日期:1999-06-01 00:00:00