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排序方式: 共有1231条查询结果,搜索用时 15 毫秒
21.
《Immunity》2021,54(11):2481-2496.e6
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M SHIGEMATSU S NAGAI T MIKUNIYA T IZUMI H WIGZELL A G EKLUND J GRUNEWALD 《Clinical and experimental immunology》1996,103(1):149-154
The expression of 13 different α and β V gene segments of the T cell receptor for antigen (TCR) was examined, using V gene-specific MoAbs, on human peripheral blood T lymphocytes from 32 healthy Japanese subjects. In addition, to examine associations between TCR V gene products and HLA alleles, the HLA class I and class II types of all subjects were serologically determined. The reactivities of the anti-TCR V-specific MoAbs were, with some significant exceptions, similar to those previously described in healthy Caucasian subjects. We found a non-random V gene usage as well as a statistically significant bias of the expression of eight Vβ gene products towards the CD4+ subpopulation, and a significant skewness in the usage of Vα12 towards the CD8+ population. Some subjects showed increased reactivities (above 10%) of certain MoAbs, mainly in the CD8+ subpopulation. We found no distinct correlation between any certain HLA class I or II allele and TCR V gene usage in the CD8+ or CD4+ subpopulations, respectively. In conclusion, the pattern of anti-TCR V-specific MoAb reactivities found in CD4+ and CD8+ subsets of peripheral blood lymphocytes of healthy Japanese subjects was in general found to match that previously described in healthy Caucasian subjects. 相似文献
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Tamauchi H Terashima M Ito M Maruyama H Ikewaki N Inoue M Gao X Hozumi K Habu S 《International immunology》2004,16(1):179-187
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Xue S Gillmore R Downs A Tsallios A Holler A Gao L Wong V Morris E Stauss HJ 《Clinical and experimental immunology》2005,139(2):167-172
Adoptive antigen-specific immunotherapy is an attractive concept for the treatment of cancer because it does not require immunocompetence of patients, and the specificity of transferred lymphocytes can be targeted against tumour-associated antigens that are poorly immunogenic and thus fail to effectively trigger autologous T cell responses. As the isolation and in vitro expansion of antigen-specific lymphocytes is difficult, 'conventional' adoptive T cell therapy can only be carried out in specialized centres in small numbers of patients. However, T cell receptor (TCR) genes isolated from antigen-specific T cells can be exploited as generic therapeutic molecules for 'unconventional' antigen-specific immunotherapy. Retroviral TCR gene transfer into patient T cells can readily produce populations of antigen-specific lymphocytes after a single round of polyclonal T cell stimulation. TCR gene modified lymphocytes are functionally competent in vitro, and can have therapeutic efficacy in murine models in vivo. TCR gene expression is stable and modified lymphocytes can develop into memory T cells. Introduction of TCR genes into CD8(+) and CD4(+) lymphocytes provides an opportunity to use the same TCR specificity to produce antigen-specific killer and helper T lymphocytes. Thus, TCR gene therapy provides an attractive strategy to develop antigen-specific immunotherapy with autologous lymphocytes as a generic treatment option. 相似文献
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Waanders Gary A.; Lussow Alexander R.; MacDonald H. Robson 《International immunology》1993,5(1):55-61
Reactivity of murine T cells with viral or bacterial superantigensis clearly correlated with the expression of TCR Vßdomains. Thus, T cells responding to the minor lymphocyte stimulatorylocus (Mls-1a) or staphylococcal enterotoxin B (SEB) expresspredominantly TCR Vß6 or Vß8.2 respectively.We have investigated the involvement of the other major variableelement of the TCR, the V domain, in these superantigen responses.Using a panel of anti-TCR V mAbs, It is demonstrated that theTCR V repertoire among superantigen stimulated Vß6+or Vß8.2+ blasts (responding to Mls-1a or SEB respectivelyin vitro) is altered in comparison with anti-CD3 stimulatedcells expressing the same V domains. Furthermore, the TCR Vrepertoire is strongly skewed in TCR Vß8.2 transgenicmice that have undergone extensive peripheral clonal deletionafter SEB injection. These data imply that the V domain influencessuperantigen recognition by sthe TCR. 相似文献
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Mice expressing transgenic T cell receptors (TCR) are used to explore important questions in immunity. However, transgene expression may have unexpected effects. We previously reported a B cell immunodeficiency, comprising decreased B cell numbers and diminished antibody responses, in mice that express a transgenic TCR specific for nicotinic acetylcholine receptor; the mice were generated using cassette vectors designed specifically for transgenic TCR expression [see Kouskoff et al. J. Immunol. Methods 1995. 180: 273-280]. We now show data suggesting that this defect is due to the expression and accumulation of TCR alpha and beta chains inside B cells and induction of an endoplasmic reticulum stress response, causing apoptosis at the pre B-I and later B cell stage. Thus, inappropriate transgene expression can profoundly affect B cells, leading to a previously undescribed mechanism of immunodeficiency. 相似文献
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Mengyun Hu Samuele Notarbartolo Mathilde Foglierini Sandra Jovic Federico Mele David Jarrossay Antonio Lanzavecchia Antonino Cassotta Federica Sallusto 《European journal of immunology》2023,53(2):2250190
T follicular helper (TFH) cells play an essential role in promoting B cell responses and antibody affinity maturation in germinal centers (GC). A subset of memory CD4+ T cells expressing the chemokine receptor CXCR5 has been described in human blood as phenotypically and clonally related to GC TFH cells. However, the antigen specificity and relationship of these circulating TFH (cTFH) cells with other memory CD4+ T cells remain poorly defined. Combining antigenic stimulation and T cell receptor (TCR) Vβ sequencing, we found T cells specific to tetanus toxoid (TT), influenza vaccine (Flu), or Candida albicans (C.alb) in both cTFH and non-cTFH subsets, although with different frequencies and effector functions. Interestingly, cTFH and non-cTFH cells specific for C.alb or TT had a largely overlapping TCR Vβ repertoire while the repertoire of Flu-specific cTFH and non-cTFH cells was distinct. Furthermore, Flu-specific but not C.alb-specific PD-1+ cTFH cells had a “GC TFH-like” phenotype, with overexpression of IL21, CXCL13, and BCL6. Longitudinal analysis of serial blood donations showed that Flu-specific cTFH and non-cTFH cells persisted as stable repertoires for years. Collectively, our study provides insights on the relationship of cTFH with non-cTFH cells and on the heterogeneity and persistence of antigen-specific human cTFH cells. 相似文献
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