scholarly journals Sodium sulfite (SoS) as decontamination strategy for Fusarium-toxin contaminated maize and its impact on immunological traits in pigs challenged with lipopolysaccharide (LPS)

2020 ◽  
Vol 36 (4) ◽  
pp. 429-442
Author(s):  
Anh-Tuan Tran ◽  
Jeannette Kluess ◽  
Susanne Kersten ◽  
Andreas Berk ◽  
Marleen Paulick ◽  
...  
Keyword(s):  
T Cells ◽  
Mononuclear Cells ◽  
Sodium Sulfite ◽  
T Cell Subsets ◽  
Lymphoid Tissues ◽  
Fluorescence Signal ◽  
Polymorphonuclear Cells ◽  
Mesenteric Lymph Nodes ◽  
Peripheral Blood Mononuclear ◽  
The Impact

Abstract The main objective of this study was to evaluate the effects of sodium sulfite (SoS) treatment of maize and its impact on the porcine immune system in the presence of an LPS-induced systemic inflammation. Control maize (CON) and Fusarium-toxin contaminated maize (FUS) were wet-preserved (20% moisture) for 79 days with (+) or without (−) SoS and then included at 10% in a diet, resulting in four experimental groups: CON−, CON+, FUS−, and FUS+ with deoxynivalenol (DON) concentrations of 0.09, 0.05, 5.36, and 0.83 mg DON/kg feed, respectively. After 42-day feeding trial (weaned barrows, n = 20/group), ten pigs per group were challenged intraperitoneally with either 7.5 μg LPS/kg BW or placebo (0.9% NaCl), observed for 2 h, and then sacrificed. Blood, mesenteric lymph nodes, and spleen were collected for phenotyping of different T cell subsets, B cells, and monocytes. Phagocytic activity and intracellular formation of reactive oxygen species (ROS) were analyzed in both polymorphonuclear cells (PMN) and peripheral blood mononuclear cells (PBMC) using flow cytometry. Our results revealed that the impact of DON was more notable on CD3+CD4+CD8+ T cells in lymphoid tissues rather than in blood T cells. In contrast, SoS treatment of maize altered leukocyte subpopulations in blood, e.g., reduced the percentage and fluorescence signal of CD8high T cells. Interestingly, SoS treatment reduced the amount of free radicals in basal ROS-producing PMNs only in LPS-challenged animals, suggesting a decrease in basal cellular ROS production (pSoS*LPS = 0.022).

scholarly journals B Cells of HIV-1–Infected Patients Bind Virions through Cd21–Complement Interactions and Transmit Infectious Virus to Activated T Cells

2000 ◽  
Vol 192 (5) ◽  
pp. 637-646 ◽  
Author(s):  
Susan Moir ◽  
Angela Malaspina ◽  
Yuexia Li ◽  
Tae-Wook Chun ◽  
Tomeka Lowe ◽  
...  
Keyword(s):  
T Cells ◽  
B Cells ◽  
Peripheral Blood ◽  
Mononuclear Cells ◽  
Lymphoid Tissues ◽  
Activated T Cells ◽  
Peripheral Blood Mononuclear ◽  
The Impact ◽  
Hiv 1 ◽  
Hiv Negative

The impact of HIV-associated immunopathogenesis on B cells has been largely associated with indirect consequences of viral replication. This study demonstrates that HIV interacts directly with B cells in both lymphoid tissues and peripheral blood. B cells isolated from lymph node and peripheral blood mononuclear cells (PBMCs) of 4 and 23 chronically infected patients, respectively, demonstrated similar capacities to pass virus to activated HIV-negative PBMCs when compared with CD4+ cells from the same patients. However, in contrast to T cells, virus associated with B cells was surface bound, as shown by its sensitivity to pronase and the staining pattern revealed by in situ amplification of HIV-1 RNA. Cell sorting and ligand displacing approaches established that CD21 was the HIV-binding receptor on B cells, and that this association was mediated through complement-opsonized virus. These B cells were also found to express significantly lower levels of CD21 compared with HIV-negative individuals, suggesting a direct perturbing effect of HIV on B cells. These findings suggest that B cells, although they themselves are not readily infected by HIV, are similar to follicular dendritic cells in their capacity to serve as extracellular reservoirs for HIV-1. Furthermore, B cells possess the added capability of circulating in peripheral blood and migrating through tissues where they can potentially interact with and pass virus to T cells.

Increases in circulating and lymphoid tissue interleukin-10 in autoimmune lymphoproliferative syndrome are associated with disease expression

Blood ◽  
2001 ◽  
Vol 97 (10) ◽  
pp. 3161-3170 ◽  
Author(s):  
Uri Lopatin ◽  
Xu Yao ◽  
Richard K. Williams ◽  
Jack J. H. Bleesing ◽  
Janet K. Dale ◽  
...  
Keyword(s):  
T Cells ◽  
Cd8 T Cells ◽  
Messenger Rna ◽  
Mononuclear Cells ◽  
Population Expansion ◽  
Interleukin 10 ◽  
Lymphoid Tissues ◽  
Autoimmune Lymphoproliferative Syndrome ◽  
Peripheral Blood Mononuclear ◽  
Lymphoproliferative Syndrome

Abstract Autoimmune lymphoproliferative syndrome (ALPS) is an inherited disorder in which genetic defects in proteins that mediate lymphocyte apoptosis, most often Fas, are associated with enlargement of lymph nodes and the spleen and a variety of autoimmune manifestations. Some patients with ALPS have relatives with these same apoptotic defects, however, who are clinically well. This study showed that the circulating levels of interleukin 10 (IL-10) were significantly higher (P < .001) in 21 patients with ALPS than in healthy controls. Moreover, the peripheral blood mononuclear cells (PBMCs) and lymphoid tissues of these patients with ALPS contained significantly higher levels of IL-10 messenger RNA (mRNA;P < .001 and P < .01, respectively). By fractionating PBMC populations, disproportionately high concentrations of IL-10 mRNA were found in the CD4−CD8−T-cell population, expansion of which is virtually pathognomonic for ALPS. Immunohistochemical staining showed intense IL-10 protein signals in lymph node regions known to contain CD4−CD8− T cells. Nonetheless, in vitro studies showed no influence of IL-10 on the survival of CD4−CD8− T cells. Overexpression of IL-10 in patients with inherited apoptotic defects is strongly associated with the overt manifestations of ALPS.

scholarly journals The differential immune responses to COVID-19 in peripheral and lung revealed by single-cell RNA sequencing

2020 ◽  
Author(s):  
Gang Xu ◽  
Furong Qi ◽  
Hanjie Li ◽  
Qianting Yang ◽  
Haiyan Wang ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Single Cell ◽  
Mononuclear Cells ◽  
Immune Cell ◽  
Close Association ◽  
Suppressor Cells ◽  
T Cell Subsets ◽  
Peripheral Blood Mononuclear ◽  
Peripheral T Cells

Understanding the mechanism that leads to immune dysfunction induced by SARS-CoV2 virus is crucial to develop treatment for severe COVID-19. Here, using single cell RNA-seq, we characterized the peripheral blood mononuclear cells (PBMC) from uninfected controls and COVID-19 patients, and cells in paired broncho-alveolar lavage fluid (BALF). We found a close association of decreased dendritic cells (DC) and increased monocytes resembling myeloid-derived suppressor cells (MDSC) which correlated with lymphopenia and inflammation in the blood of severe COVID-19 patients. Those MDSC-like monocytes were immune-paralyzed. In contrast, monocyte-macrophages in BALFs of COVID-19 patients produced massive amounts of cytokines and chemokines, but secreted little interferons. The frequencies of peripheral T cells and NK cells were significantly decreased in severe COVID-19 patients, especially for innate-like T and various CD8+ T cell subsets, compared to health controls. In contrast, the proportions of various activated CD4+ T cell subsets, including Th1, Th2 and Th17-like cells were increased and more clonally expanded in severe COVID-19 patients. Patients' peripheral T cells showed no sign of exhaustion or augmented cell death, whereas T cells in BALFs produced higher levels of IFNG, TNF, CCL4 and CCL5 etc. Paired TCR tracking indicated abundant recruitment of peripheral T cells to the patients' lung. Together, this study comprehensively depicts how the immune cell landscape is perturbed in severe COVID-19.

scholarly journals Effect of activated lymphocytes on the regulation of hematopoiesis: enhancement and suppression of in vitro BFU-E growth by T cells stimulated by autologous non-T cells

Blood ◽  
1986 ◽  
Vol 67 (4) ◽  
pp. 1143-1147 ◽  
Author(s):  
M Harada ◽  
S Nakao ◽  
K Kondo ◽  
K Odaka ◽  
M Ueda ◽  
...  
Keyword(s):  
T Cells ◽  
Mononuclear Cells ◽  
Colony Growth ◽  
Mixed Lymphocyte Culture ◽  
Lymphocyte Culture ◽  
T Cell Subsets ◽  
Activated T Cells ◽  
Peripheral Blood Mononuclear ◽  
Erythroid Progenitor

Abstract Autologous mixed lymphocyte culture (AMLR) is an immunologic response with memory and specificity and plays a role in immune regulation. Effects of T cells activated by AMLR were studied in the regulation of in vitro erythropoiesis. AMLR-activated T cells were cocultured with autologous non-T, nonphagocytic peripheral blood mononuclear cells for assaying erythroid progenitor cells (BFU-E). T cells activated for 3 days in AMLR showed significant enhancement of in vitro colony growth by BFU-E. In contrast, activated T cells from day 7 AMLR caused significant suppression of BFU-E growth. Both enhancing and suppressing activities of AMLR-activated T cells were mediated by an la-positive and radiosensitive population within the OKT4+ subset. These observations suggest that AMLR-activated T cells may play a role in the immune-mediated regulation of in vitro erythropoiesis. It is also suggested that heterogeneous T-cell subsets may exert regulatory functions in the regulation of in vitro hematopoiesis.

Galectin-9 expression correlates with efficacy of tacrolimus therapy in rheumatoid arthritis

2020 ◽  
Author(s):  
qiang shu ◽  
Jiao Sun ◽  
Yameng Sui ◽  
Yunqing Wang ◽  
Lijun Song ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
T Cells ◽  
Disease Activity ◽  
T Regulatory Cells ◽  
Mononuclear Cells ◽  
Severe Disease ◽  
T Cell Subsets ◽  
Poor Responders ◽  
Immunological Parameters ◽  
Peripheral Blood Mononuclear

Abstract Background: The calcineurin inhibitor tacrolimus (TAC) is the second-line treatment for rheumatoid arthritis (RA). Galectin-9 (Gal-9) is a multifunctional immunomodulatory factor highly expressed in RA synovial tissues and synovial fluid. This study aimed to investigate the expression of Gal-9 and its correlation with disease activity and response to TAC in RA patients.Methods: Active RA patients were enrolled and treated with TAC alone or in combination with methotrexate and/or prednisone for 12 weeks in a prospective cohort study. Clinical and immunological parameters were recorded at baseline and at week 12. We measured Gal-9 expression in different subsets of peripheral blood mononuclear cells using flow cytometry and assayed Gal-9 levels in plasma. We also tested cytokine levels in plasma by ELISA. Results: The disease activity of RA patients notably decreased after TAC treatment. At baseline, the percentages of CD4+ T cells and T regulatory cells (CD4+CD25+CD127low) expressing Gal-9 were higher in the group with severe disease than in mild or moderate groups. After TAC treatment in RA patients, the Gal-9 expression in CD3+, CD4+, CD8+ and CD4-CD8- cell subsets decreased, as well as Gal-9 mean fluorescence intensity in CD3+, CD4+ and CD8+ T cells. Similarly, plasma Gal-9 levels were lower at week 12 than at baseline. Good responders showed significantly lower Gal-9 expression on CD3+ and CD4+ T cell subsets as well as lower plasma Gal-9 levels than poor responders. Gal-9 expression positively correlates with disease activity in RA patients.Conclusion: Gal-9 can be regarded as a new biomarker for evaluating RA activity and efficacy of TAC.

scholarly journals AB0044 ESTABLISHED RHEUMATOID ARTHRITIS PATIENTS HAVE INCREASED FREQUENCIES OF FOLLICULAR REGULATORY T CELLS IN PERIPHERAL BLOOD

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 1325.3-1325
Author(s):  
C. Tomé ◽  
S. C. Barreira ◽  
P. Martins ◽  
A. Valido ◽  
R. Barros ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
T Cells ◽  
Peripheral Blood ◽  
Mononuclear Cells ◽  
T Cell Subsets ◽  
Peripheral Blood Mononuclear ◽  
Tfh Cells ◽  
Follicular Helper ◽  
Healthy Donors ◽  
Cd69 Expression

Background:Several studies have demonstrated that an immune dysregulation affecting both B and T cells occurs in rheumatoid arthritis (RA). Follicular helper T (Tfh) cells are crucial for B cell maturation, activation and class-switching as well as for germinal center (GC) formation, whereas follicular regulatory T (Tfr) cells can modulate the GC reaction by suppressing Tfh and B cells.Objectives:The main goal of this study was to analyze the phenotype and frequency of circulating follicular T cell subsets in established RA patients.Methods:Blood samples were collected from established RA patients with active disease, treated with methotrexate (n=32) and from a group of age and sex-matched healthy donors (n=11). Peripheral blood mononuclear cells (PBMC) were isolated and Tfh (CD4+CXCR5+CD45RO+) and Tfr (CD4+ CXCR5+CD25+FoxP3+) cells, as well as their three major subsets [CXCR3+CCR6- (Th1-like), CXCR3-CCR6- (Th2-like) and CXCR3-CCR6+ (Th17-like)] were evaluated by flow cytometry.Results:The frequency of circulating Tfh cells was similar between established RA patients and controls. Nonetheless, RA patients had a decreased frequency of Th1-like Tfh cells, and an increased frequency of Th2-like Tfh cells when compared to controls. No significant differences were observed in the frequencies of Th17-like Tfh cells between both groups. The frequency of circulating Tfr cells was significantly increased in RA patients in comparison to controls. Furthermore, Tfr cells from RA patients had significantly increased CD69 median fluorescence intensity (MFI) values when compared to controls. No significant differences were found in the percentages and MFI values of PD-1, ICOS, CD28, CTLA-4, CD40-L and HLA-DR expressed by Tfh and Tfr cells in RA patients when compared to controls.Conclusion:Established RA patients have increased circulating frequencies of Tfr cells, with higher CD69 expression levels, when compared to healthy controls. These results suggest a pre-activation state of Tfr cells in RA and a potential role in the disease physiopathology.*RA Moura, JE Fonseca and L Graca are joint senior authors.Disclosure of Interests:None declared

scholarly journals Impact of Cryopreservation on Viability, Phenotype, and Functionality of Porcine PBMC

2021 ◽  
Vol 12 ◽  
Author(s):  
Yanli Li ◽  
Enric Mateu ◽  
Ivan Díaz
Keyword(s):  
T Cells ◽  
Cell Viability ◽  
Mononuclear Cells ◽  
Effector Memory ◽  
Respiratory Syndrome Virus ◽  
Double Positive ◽  
Peripheral Blood Mononuclear ◽  
Recall Antigen ◽  
Ifn Γ ◽  
The Impact

The use of frozen peripheral blood mononuclear cells (PBMC) is common in immunological studies. The impact of freezing PBMC has been assessed using human and mice cells, but little information is available regarding domestic animals. In the present study, the phenotype and functionality of frozen porcine PBMC were examined. In a preliminary experiment, three freezing media: fetal bovine serum plus 10% dimethyl sulfoxide, PSC cryopreservation kit, and Cryostor CS10, were compared regarding the preservation of cell viability and the response of PBMC to mitogens after thawing. After being stored one month in liquid nitrogen, cell viability was above 89% for all freezing media. The ELISPOT IFN-gamma (IFN-γ) results in response to PHA and of IgG ELISPOT in response to R848+IL-2 were similar to those obtained using fresh PBMC. In the second set of experiments, PBMC were obtained from five pigs vaccinated against Porcine reproductive and respiratory syndrome virus (PRRSV) and then frozen using Cryostor CS10. Recovered cells were phenotyped by flow cytometry using anti-CD3, CD4, CD8, and CD21 antibodies and were used to assess the PRRSV-specific responses in a proliferation experiment, an IFN-γ ELISPOT, and an IgG ELISPOT, and compared to the results obtained with fresh cells. The antigen-specific responses of frozen cells were significantly (p<0.05) impaired in the proliferation assay, particularly for CD4/CD8 double-positive T-cells and for CD21+ cells. Freezing resulted in decreased proliferation when Con A, but not PHA, was used. In ELISPOT, cryopreservation resulted in a decreased frequency of IFN-γ-secreting cells in response to PRRSV (p<0.05) but the response to PHA was not affected. No differences were observed in the IgG ELISPOT after polyclonal activation. Taken together, cryopreservation of porcine PBMC had a significant impact on the magnitude of recall antigen responses and therefore, it may affect the response of effector/memory cells but seems not to have a major impact on naïve T-cells. These results may help to the better use of frozen porcine PBMC, and to the interpretation of the results obtained from them.

scholarly journals Functional biomarker signatures of circulating T-cells and its association with distinct clinical status of leprosy patients and their respective household contacts

2020 ◽  
Author(s):  
Pedro Henrique Ferreira Marçal ◽  
Rafael Silva Gama ◽  
Lorena Bruna de Oliveira Pereira ◽  
Olindo Assis Martins Filho ◽  
Roberta Olmo Pinheiro ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Mononuclear Cells ◽  
Clinical Status ◽  
T Cell Subsets ◽  
Diagnostic Tools ◽  
Peripheral Blood Mononuclear ◽  
Household Contacts ◽  
Leprosy Patients

Abstract Background: Leprosy is a chronic infectious disease classified into two subgroups for therapeutic purposes: paucibacillary (PB) and multibacillary (MB), closely related to the host immune responses. In this context it is noteworthy looking for immunological biomarkers applicable as complementary diagnostic tools as well as a laboratorial strategy to detect subclinical leprosy in household contacts. Methods: The main goal of the present study was to characterize the global cytokine signatures of CD4+ and CD8+ T-cells from leprosy patients with distinct clinical forms and their respective household contacts (HHC) upon in vitro antigen-specific stimuli. Short-term culture of peripheral blood mononuclear cells was done. After incubation, cells were harvested and prepared for surface and intracytoplasmic cytokine staining Results: The cytokine signature analysis demonstrated that leprosy patients presented a polyfunctional profile of T-cells subsets, with increased frequency of IFN-g+ T-cell subsets along with IL-10+ and IL-4+ from CD4+ T-cells. Moreover, L(PB) displayed a polyfunctional profile characterized by enhanced percentage of IFN-g+, IL-10+ and IL-4+ produced by most T-cell subsets, as compared to L(MB) that presented a more restricted cytokine functional profile mediated by IL-10+ and IL-4+ T-cells with minor contribution of IFN-g produced by CD4+ T-cells. Noteworthy was that HHC(MB) exhibited enhanced frequency of IFN-g+ T-cells, contrasting with HHC(PB) that presented a cytokine profile limited to IL-10 and IL-4. Conclusions: Together, our findings provide additional immunological features associated with leprosy and household contacts. These data provide evidence that biomarkers of immune response can be useful complementary diagnostic/prognostic tools as well as insights that household contacts may present subclinical infection.

scholarly journals Effect of activated lymphocytes on the regulation of hematopoiesis: enhancement and suppression of in vitro BFU-E growth by T cells stimulated by autologous non-T cells

Blood ◽  
1986 ◽  
Vol 67 (4) ◽  
pp. 1143-1147 ◽  
Author(s):  
M Harada ◽  
S Nakao ◽  
K Kondo ◽  
K Odaka ◽  
M Ueda ◽  
...  
Keyword(s):  
T Cells ◽  
Mononuclear Cells ◽  
Colony Growth ◽  
Mixed Lymphocyte Culture ◽  
Lymphocyte Culture ◽  
T Cell Subsets ◽  
Activated T Cells ◽  
Peripheral Blood Mononuclear ◽  
Erythroid Progenitor

Autologous mixed lymphocyte culture (AMLR) is an immunologic response with memory and specificity and plays a role in immune regulation. Effects of T cells activated by AMLR were studied in the regulation of in vitro erythropoiesis. AMLR-activated T cells were cocultured with autologous non-T, nonphagocytic peripheral blood mononuclear cells for assaying erythroid progenitor cells (BFU-E). T cells activated for 3 days in AMLR showed significant enhancement of in vitro colony growth by BFU-E. In contrast, activated T cells from day 7 AMLR caused significant suppression of BFU-E growth. Both enhancing and suppressing activities of AMLR-activated T cells were mediated by an la-positive and radiosensitive population within the OKT4+ subset. These observations suggest that AMLR-activated T cells may play a role in the immune-mediated regulation of in vitro erythropoiesis. It is also suggested that heterogeneous T-cell subsets may exert regulatory functions in the regulation of in vitro hematopoiesis.

scholarly journals Low-Density Granulocytes Affect T-SPOT.TB Assay by Inhibiting the Production of Interferon-γ in T Cells via PD-L1/PD-1 Pathway

2021 ◽  
Vol 11 ◽  
Author(s):  
Jiayue Rao ◽  
Rigu Su ◽  
Yiping Peng ◽  
Yang Guo ◽  
Zikun Huang ◽  
...  
Keyword(s):  
T Cells ◽  
Mononuclear Cells ◽  
Neutralizing Antibody ◽  
Interferon Γ ◽  
Low Density ◽  
Peripheral Blood Mononuclear ◽  
Tuberculosis Patients ◽  
Exogenous Addition ◽  
Positive Rate ◽  
The Impact

BackgroundT-SPOT TB (T-SPOT) assay is widely used for detection of Mycobacterium tuberculosis infection that is based on the detection of M. tuberculosis-specific interferon-γ-secreting T cells (ISCs) in peripheral blood mononuclear cells (PBMCs). Recently, high frequencies of low-density granulocytes (LDGs) were found in the PBMCs of tuberculosis patients. Whether these LDGs affect the detection of T-SPOT has not been investigated. The impact of LDGs on T-SPOT assay and related mechanism were investigated in this study.MethodsThe correlations between the frequencies of LDGs and the results of T-SPOT were analyzed. T-SPOT with LDG-removed PBMCs and PBMCs with exogenous addition of LDGs were performed. The possible mechanism was explored by detecting the levels of negative immune regulatory molecules on LDGs. The impact of programmed death ligand 1 (PD-L1) on T-SPOT was evaluated and confirmed by function blocking with neutralizing antibody.ResultsThe positive rates of T-SPOT and ISCs in tuberculosis patients with low LDGs frequency (n = 22) were significantly higher than those with high LDGs frequency (n = 39). Removal or exogenous addition of LDGs significantly increased or decreased the ISCs and the positive rate of T-SPOT. The frequencies of interferon-γ-producing T cells were negatively correlated with the frequencies of LDGs. The expression of PD-L1 was significantly elevated on LDGs. Pretreatment of LDGs with anti-PD-L1 antibody significantly counteracted the impact of LDGs on T-SPOT. Treatment of PBMCs with anti-PD-L1 antibody resulted in comparable ISCs with that of LDG removal.ConclusionLDGs can inhibit the production of interferon-γ in T cells and decrease the positive rated of T-SPOT assay via highly expressed PD-L1.

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