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排序方式: 共有645条查询结果,搜索用时 15 毫秒
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Dissecting the complexity of the memory T cell response 总被引:2,自引:0,他引:2
Memory immune responses are classically attributed to the reactivation of long-lived, antigen-specific T lymphocytes that
persist in a quiescent state. Determining mechanisms for the generation of memory T cells and dissecting the functional nature
of the memory T cell pool has been encumbered by an inability to distinguish recently activated effector T cells from memory
T cells. We have established new activation and biochemical criteria that distinguish effector and memory T cells and have
applied these criteria to follow memory generation from activated cells in vivo. We found that the resultant memory T cell
pool is heterogeneous and consists of effector-like and resting memory-like subsets that differ in expression of the homing
receptor, CD62L. We discuss these findings in the context of memory T cell heterogeneity identified in human and mouse systems.
These results suggest that more than one type of previously activated T cell can mediate recall or memory immune responses
and that elucidating the fundamental phenotypic and functional features of memory T cell subsets is therefore critical to
deciphering the complex nature of the memory immune response. 相似文献
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Escudier B Dorval T Chaput N André F Caby MP Novault S Flament C Leboulaire C Borg C Amigorena S Boccaccio C Bonnerot C Dhellin O Movassagh M Piperno S Robert C Serra V Valente N Le Pecq JB Spatz A Lantz O Tursz T Angevin E Zitvogel L 《Journal of translational medicine》2005,3(1):10-13
BACKGROUND: DC derived-exosomes are nanomeric vesicles harboring functional MHC/peptide complexes capable of promoting T cell immune responses and tumor rejection. Here we report the feasability and safety of the first Phase I clinical trial using autologous exosomes pulsed with MAGE 3 peptides for the immunization of stage III/IV melanoma patients. Secondary endpoints were the monitoring of T cell responses and the clinical outcome. PATIENTS AND METHODS: Exosomes were purified from day 7 autologous monocyte derived-DC cultures. Fifteen patients fullfilling the inclusion criteria (stage IIIB and IV, HLA-A1+, or -B35+ and HLA-DPO4+ leukocyte phenotype, tumor expressing MAGE3 antigen) were enrolled from 2000 to 2002 and received four exosome vaccinations. Two dose levels of either MHC class II molecules (0.13 versus 0.40 x 1014 molecules) or peptides (10 versus 100 mug/ml) were tested. Evaluations were performed before and 2 weeks after immunization. A continuation treatment was performed in 4 cases of non progression. RESULTS: The GMP process allowed to harvest about 5 x 1014 exosomal MHC class II molecules allowing inclusion of all 15 patients. There was no grade II toxicity and the maximal tolerated dose was not achieved. One patient exhibited a partial response according to the RECIST criteria. This HLA-B35+/A2+ patient vaccinated with A1/B35 defined CTL epitopes developed halo of depigmentation around naevi, a MART1-specific HLA-A2 restricted T cell response in the tumor bed associated with progressive loss of HLA-A2 and HLA-BC molecules on tumor cells during therapy with exosomes. In addition, one minor, two stable and one mixed responses were observed in skin and lymph node sites. MAGE3 specific CD4+ and CD8+ T cell responses could not be detected in peripheral blood. CONCLUSION: The first exosome Phase I trial highlighted the feasibility of large scale exosome production and the safety of exosome administration. 相似文献
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Natacha Colliou Yong Ge Minghao Gong Mojgan Zadeh Jing Li Francis Alonzo III 《Gut microbes》2018,9(3):279-287
Regulation of Th17 and Th1 cell responses against intracellular pathogens, including Listeria monocytogenes (L. m), is critical to limit inflammation-induced tissue damage. We recently demonstrated the ability of P. UF1 bacterium derived from the intestinal bacterial commensals of preterm infants fed human breast milk to significantly mitigate pathogen-induced inflammation limiting colonic tissue damage. Here we further elucidated the potential of P. UF1 to also regulate innate and T cells, particularly Th17 and Th1 cells, against systemic L. m infection. Data demonstrate that P. UF1 not only robustly regulated protective Th17 and Th1 cells, but also sustained regulatory T cells (Treg cells) resulting in accelerated L. m clearance. Together, regulation of pathogenic inflammation by a novel probiotic bacterium such as P. UF1 may illuminate a new strategy to specifically control Th17-Th1 cells via IL-10+ Treg cells to limit systemic tissue damage induced by intracellular pathogens, including L. m. 相似文献
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Johanna Sundqvist Mojgan Padyab Anna-Karin Hurtig Mehdi Ghazinour 《International journal of mental health》2018,47(1):3-25
This study aims to contribute to the knowledge of social support and its association with mental health amongst social workers and police officers in forced repatriation work of unaccompanied asylum-seeking refugee children. Nationally distributed surveys to social workers and police officers with and without experience of forced repatriation were used, measured by an abbreviated version of the Interview Schedule for Social Interaction (ISSI), and analyzed by univariate and multivariable regression models. Social workers in forced repatriation showed significantly poorer mental health than other social workers, but simultaneously relatively high access to social support. Irrespective of working with forced repatriation, police officers reported relatively high access to social support, but no difference in mental health. Furthermore, low levels of satisfaction with social interaction and close emotional support increased the odds of psychological disturbances for police officers in forced repatriation. Findings are discussed with special regard to the complexity of forced repatriation, particularly when children are the focus. 相似文献
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