Single-Cell Transcriptome Analysis Of CD8+ T-cell Memory Inflation
Ontology highlight
ABSTRACT:
ORGANISM(S): other sequences Mus musculus Homo sapiens
PROVIDER: GSE128147 | GEO | 2019/03/12
REPOSITORIES: GEO
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Project description:Reconstitution of cytomegalovirus (CMV)-specific immunity following transplant remains a primary clinical objective to prevent CMV disease, and adoptive immunotherapy of CMV-specific T cells can be an effective therapeutic approach. Due to the persistence of CMV, most CMV-specific CD8+ T cells become terminally differentiated effector cells (TEFF). However, a minor subset retains a memory phenotype (TM). Interestingly, recent studies suggest that CMV-specific CD8+ T cells with different phenotypes may have different abilities to reconstitute sustained immunity following transfer. The immunology of human CMV (HCMV) infections is reflected in the mouse model of MCMV infection. We found that HCMV- and MCMV-specific T cells displayed shared genetic programs, validating the MCMV model for studies of CMV-specific T cells in vivo. After transfer, the proliferative capacity of MCMV-specific TM cells was vastly superior to TEFF cells. Strikingly, TM cells expanded and established sustained and diverse T cell populations even after multiple challenges. Although both TEFF and TM cells could protect Rag-/- mice, only TM cells could consistently survive after transfer into immune replete, latently infected recipients and respond if recipient immunity was lost. These data show that CMV-specific TM cells retain memory function during persistent infection and can re-establish CMV immunity when necessary. C57BL/6 mice were infected intraperitoneally (i.p.) with MCMV strain MW97.01 between 6-16 weeks of age. Splenocytes were isolated from chronically-infected mice and co-stained with three PE-conjugated tetramers loaded with the antigenic peptides from M38, m139 and IE3, all of which promote memory inflation. Cells were then stained with fluorescently conjugated antibodies and sorted on a MoFlo cell sorter. Naïve CD8+ cells were identified as CD44lo. MCMV-specific T cells were identified as CD8+, CD44hi and tetramer binding and then further segregated into memory and effector cells subsets by their expression of KLRG1 and CD127.
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Project description:Plasmacytoid dendritic cells (pDC) are the major source of type I IFN (IFN-I) in vivo during Murine Cytomegalovirus (MCMV) infection. This response requires pDC-intrinsic MyD88-dependent signaling by Toll Like Receptors 7/9. Provided that they express appropriate recognition receptors such as Ly49H, Natural Killer (NK) cells can directly sense and kill MCMV-infected cells. While MyD88- and Ly49H-dependent responses can contribute to MCMV control, the objective is to understand the relative importance of these 3 mechanisms. In order to decipher the relative impact of MyD88- and Ly49H-dependent mechanisms during MCMV infection, we performed a genome-wide expression analysis on total spleen of Ly49H-/-MyD88+/+, Ly49H-/-MyD88-/-, Ly49H+/+MyD88+/+ and Ly49H+/+MyD88-/- BALB/c mice at different time points after MCMV infection (d0, d1,5, d2, d3 and d6). This study includes data from the spleen BALB/c mice, under steady-state or MCMV condition at different time points. 2 to 5 mice for each mouse strain for each time point were used, and were hybridized on 5 separate batches of gene chips.
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Project description:Enteropathy associated T-cell lymphoma (EATL) is a rare non-Hodgkin lymphoma that may complicate celiac disease and typically occurs in patients with refractoriness to the gluten- free diet. The majority of these patients harbor intra-epithelial lymphocytes (IEL) with an aberrant phenotype in the small intestine which are thus considered as the ‘precursor’ lymphoma cells. We here report on a case of extra-intestinal EATL that originated from a clonal γδ-IEL population rather than from aberrant IEL. This EATL displayed a distinctive pattern of immunophenotypical, T-cell receptor immunogenetic, and chromosomal aberrancies defining this lymphoma as a novel variant of EATL.
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Project description:This a model from the article:
Dynamics of killer T cell inflation in viral infections.
Wodarz D, Sierro S, Klenerman P. J R Soc Interface
2007 Jun 22;4(14):533-43 17251133
,
Abstract:
Upon acute viral infection, a typical cytotoxic T lymphocyte (CTL) response is
characterized by a phase of expansion and contraction after which it settles at
a relatively stable memory level. Recently, experimental data from mice infected
with murine cytomegalovirus (MCMV) showed different and unusual dynamics. After
acute infection had resolved, some antigen specific CTL started to expand over
time despite the fact that no replicative virus was detectable. This phenomenon
has been termed as "CTL memory inflation". In order to examine the dynamics of
this system further, we developed a mathematical model analysing the impact of
innate and adaptive immune responses. According to this model, a potentially
important contributor to CTL inflation is competition between the specific CTL
response and an innate natural killer (NK) cell response. Inflation occurs most
readily if the NK cell response is more efficient than the CTL at reducing virus
load during acute infection, but thereafter maintains a chronic virus load which
is sufficient to induce CTL proliferation. The model further suggests that
weaker NK cell mediated protection can correlate with more pronounced CTL
inflation dynamics over time. We present experimental data from mice infected
with MCMV which are consistent with the theoretical predictions. This model
provides valuable information and may help to explain the inflation of CMV
specific CD8+T cells seen in humans as they age.
This model was taken from the CellML repository
and automatically converted to SBML.
The original model was:
Wodarz D, Sierro S, Klenerman P. (2007) - version=1.0
The original CellML model was created by:
Catherine Lloyd
c.lloyd@auckland.ac.nz
The University of Auckland
This model originates from BioModels Database: A Database of Annotated Published Models (http://www.ebi.ac.uk/biomodels/). It is copyright (c) 2005-2011 The BioModels.net Team.
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To cite BioModels Database, please use: Li C, Donizelli M, Rodriguez N, Dharuri H, Endler L, Chelliah V, Li L, He E, Henry A, Stefan MI, Snoep JL, Hucka M, Le Novère N, Laibe C (2010) BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. BMC Syst Biol., 4:92.
2024-09-02 | BIOMD0000000687 | BioModels