Faculty Opinions recommendation of Hypercholesterolemia induces T cell expansion in humanized immune mice.

BackgroundAdoptive cell therapy (ACT) is an approved treatment option for certain hematological cancers and has also shown success for some solid cancers. Still, benefit and eligibility do not extend to all patients. ACT with Vγ9Vδ2 T cells is a promising approach to overcome this hurdle.MethodsIn this study, we explored the effect of different cytokine conditions on the expansion of Vγ9Vδ2 T cells in vitro.ResultsWe could show that Vγ9Vδ2 T cell expansion is feasible with two different cytokine conditions: (a) 1000U/ml interleukin (IL)-2 and (b) 100U/ml IL-2+100U/ml IL-15. We did not observe differences in expansion rate or Vγ9Vδ2 T cell purity between the conditions; however, IL-2/IL-15-expanded Vγ9Vδ2 T cells displayed enhanced cytotoxicity against tumor cells, also in hypoxia. While this increase in killing capacity was not reflected in phenotype, we demonstrated that IL-2/IL-15-expanded Vγ9Vδ2 T cells harbor increased amounts of perforin, granzyme B and granulysin in a resting state and release more upon activation. IL-2/IL-15-expanded Vγ9Vδ2 T cells also showed higher levels of transcription factor T-bet, which could indicate that T-bet and cytotoxic molecule levels confer the increased cytotoxicity.ConclusionsThese results advocate the inclusion of IL-15 into ex vivo Vγ9Vδ2 T cell expansion protocols in future clinical studies.

Download Full-text

B cell depletion impairs vaccination-induced CD8+ T cell responses in a type I interferon-dependent manner

Annals of the Rheumatic Diseases ◽

10.1136/annrheumdis-2021-220435 ◽

2021 ◽

pp. annrheumdis-2021-220435

Author(s):

Theresa Graalmann ◽

Katharina Borst ◽

Himanshu Manchanda ◽

Lea Vaas ◽

Matthias Bruhn ◽

...

Keyword(s):

T Cells ◽

T Cell ◽

B Cells ◽

B Cell ◽

Cell Expansion ◽

De Novo ◽

T Cell Responses ◽

Type I ◽

Cell Responses ◽

T Cell Expansion

ObjectivesThe monoclonal anti-CD20 antibody rituximab is frequently applied in the treatment of lymphoma as well as autoimmune diseases and confers efficient depletion of recirculating B cells. Correspondingly, B cell-depleted patients barely mount de novo antibody responses during infections or vaccinations. Therefore, efficient immune responses of B cell-depleted patients largely depend on protective T cell responses.MethodsCD8+ T cell expansion was studied in rituximab-treated rheumatoid arthritis (RA) patients and B cell-deficient mice on vaccination/infection with different vaccines/pathogens.ResultsRituximab-treated RA patients vaccinated with Influvac showed reduced expansion of influenza-specific CD8+ T cells when compared with healthy controls. Moreover, B cell-deficient JHT mice infected with mouse-adapted Influenza or modified vaccinia virus Ankara showed less vigorous expansion of virus-specific CD8+ T cells than wild type mice. Of note, JHT mice do not have an intrinsic impairment of CD8+ T cell expansion, since infection with vaccinia virus induced similar T cell expansion in JHT and wild type mice. Direct type I interferon receptor signalling of B cells was necessary to induce several chemokines in B cells and to support T cell help by enhancing the expression of MHC-I.ConclusionsDepending on the stimulus, B cells can modulate CD8+ T cell responses. Thus, B cell depletion causes a deficiency of de novo antibody responses and affects the efficacy of cellular response including cytotoxic T cells. The choice of the appropriate vaccine to vaccinate B cell-depleted patients has to be re-evaluated in order to efficiently induce protective CD8+ T cell responses.

Download Full-text

Optimizing interleukin-2 concentration, seeding density and bead-to-cell ratio of T-cell expansion for adoptive immunotherapy

BMC Immunology ◽

10.1186/s12865-021-00435-7 ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Sasan Ghaffari ◽

Monireh Torabi-Rahvar ◽

Sajjad Aghayan ◽

Zahra Jabbarpour ◽

Kobra Moradzadeh ◽

...

Keyword(s):

T Cells ◽

T Cell ◽

Growth Kinetics ◽

Cell Expansion ◽

Mononuclear Cells ◽

Adoptive Cell Therapy ◽

Interleukin 2 ◽

Seeding Density ◽

Healthy Donors ◽

T Cell Expansion

Abstract Background The successful ex vivo expansion of T-cells in great numbers is the cornerstone of adoptive cell therapy. We aimed to achieve the most optimal T-cell expansion condition by comparing the expansion of T-cells at various seeding densities, IL-2 concentrations, and bead-to-cell ratios. we first expanded the peripheral blood mononuclear cells (PBMCs) of a healthy donor at a range of 20 to 500 IU/mL IL-2 concentrations, 125 × 103 to 1.5 × 106 cell/mL, and 1:10 to 10:1 B:C (Bead-to-cell) ratios and compared the results. We then expanded the PBMC of three healthy donors using the optimized conditions and examined the growth kinetics. On day 28, CD3, CD4, and CD8 expression of the cell populations were analyzed by flow cytometry. Results T-cells of the first donor showed greater expansion results in IL-2 concentrations higher than 50 IU/mL compared to 20 IU/mL (P = 0.02). A seeding density of 250 × 103 cell/mL was superior to higher or lower densities in expanding T-cells (P = 0.025). Also, we witnessed a direct correlation between the B:C ratio and T-cell expansion, in which, in 5:1 and 10:1 B:C ratios T-cell significantly expanded more than lower B:C ratios. The results of PBMC expansions of three healthy donors were similar in growth kinetics. In the optimized condition, 96–98% of the lymphocyte population expressed CD3. While the majority of these cells expressed CD8, the mean expression of CD4 in the donors was 19.3, 16.5, and 20.4%. Conclusions Our methodology demonstrates an optimized culture condition for the production of large quantities of polyclonal T-cells, which could be useful for future clinical and research studies.

Download Full-text

Polyclonal expansion of TCR Vbeta 21.3+ CD4+ and CD8+ T cells is a hallmark of Multisystem Inflammatory Syndrome in Children

Science Immunology ◽

10.1126/sciimmunol.abh1516 ◽

2021 ◽

Vol 6 (59) ◽

pp. eabh1516

Author(s):

Marion Moreews ◽

Kenz Le Gouge ◽

Samira Khaldi-Plassart ◽

Rémi Pescarmona ◽

Anne-Laure Mathieu ◽

...

Keyword(s):

T Cells ◽

T Cell ◽

Cell Expansion ◽

Healthy Children ◽

Antigenic Peptides ◽

T Cell Repertoire ◽

Cell Repertoire ◽

Hla Dr ◽

T Cell Expansion ◽

Inflammatory Syndrome

Multiple Inflammatory Syndrome in Children (MIS-C) is a delayed and severe complication of SARS-CoV-2 infection that strikes previously healthy children. As MIS-C combines clinical features of Kawasaki disease and Toxic Shock Syndrome (TSS), we aimed to compare the immunological profile of pediatric patients with these different conditions. We analyzed blood cytokine expression, and the T cell repertoire and phenotype in 36 MIS-C cases, which were compared to 16 KD, 58 TSS, and 42 COVID-19 cases. We observed an increase of serum inflammatory cytokines (IL-6, IL-10, IL-18, TNF-α, IFNγ, CD25s, MCP1, IL-1RA) in MIS-C, TSS and KD, contrasting with low expression of HLA-DR in monocytes. We detected a specific expansion of activated T cells expressing the Vβ21.3 T cell receptor β chain variable region in both CD4 and CD8 subsets in 75% of MIS-C patients and not in any patient with TSS, KD, or acute COVID-19; this correlated with the cytokine storm detected. The T cell repertoire returned to baseline within weeks after MIS-C resolution. Vβ21.3+ T cells from MIS-C patients expressed high levels of HLA-DR, CD38 and CX3CR1 but had weak responses to SARS-CoV-2 peptides in vitro. Consistently, the T cell expansion was not associated with specific classical HLA alleles. Thus, our data suggested that MIS-C is characterized by a polyclonal Vβ21.3 T cell expansion not directed against SARS-CoV-2 antigenic peptides, which is not seen in KD, TSS and acute COVID-19.

Download Full-text

Mast cells and T-cell expansion

Blood ◽

10.1182/blood-2007-12-128330 ◽

2008 ◽

Vol 111 (5) ◽

pp. 2497-2498

Author(s):

Susumu Nakae ◽

Keisuke Oboki ◽

Hirohisa Saito

Keyword(s):

T Cells ◽

Dendritic Cells ◽

T Cell ◽

Mast Cells ◽

Cell Expansion ◽

Memory T Cells ◽

T Cell Expansion

IgE/antigen-FcϵRI crosslinking promotes antigen internalization and apoptosis in mouse mast cells. Dendritic cells uptake the apoptotic mast cells carrying internalized antigens, and thus can efficiently present the antigens to memory T cells.

Download Full-text