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Regulatory T-cell subset distribution in children with primary hypertension is associated with hypertension severity and hypertensive target organ damage. J Hypertens 2021; 38:692-700. [PMID: 31834124 DOI: 10.1097/hjh.0000000000002328] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND The relationship between circulating regulatory T-cell (Tregs) subset distribution and hypertension severity in children with primary hypertension is not known. We aimed to find out if target organ damage (TOD) in children with primary hypertension is related to defects in Tregs distribution reflected by their phenotype characteristics. METHODS The study constituted 33 nontreated hypertensive children and 35 sex-matched and age-matched controls. Using multicolor flow cytometry technique, we assessed a distribution of the total Tregs (CD4CD25CD127) and their subsets (CD45RA-naive Tregs, CD45RA memory/activated Tregs, CD45RACD31 recent thymic emigrants Tregs and mature naive CD45RACD31 Tregs) in the whole blood. RESULTS Hypertensive children showed decreased percentage of the total Tregs, the CD45RA-naive Tregs, the total CD31 Tregs and the recent thymic emigrants Tregs but elevation of the CD45RA memory/activated Treg and mature naive CD45RACD31 Tregs. Decreased frequency of the total Tregs, naive Tregs and CD31-bearing Treg cell subsets (CD31 total Tregs, CD45RACD31 recent thymic emigrants Tregs) negatively correlated to TOD markers, arterial stiffness and blood pressure elevation. In contrast, increased percentage of memory Tregs and CD31 Tregs subsets positively correlated to organ damage markers, arterial stiffness and blood pressure values. These changes were independent of BMI, age, sex and hsCRP. CONCLUSION Both diagnosis of hypertension, TOD and arterial stiffness in hypertensive children were associated with decreased population of total CD4 Tregs, limited output of recent thymic emigrants Tregs, and increased pool of activated/memory Tregs. Hypertension was an independent predictor of the circulating Treg subsets distribution irrespective of hsCRP.
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Wiese-Szadkowska M, Helmin-Basa A, Eljaszewicz A, Gackowska L, Januszewska M, Motyl I, Andryszczyk M, Wieczynska J, Michalkiewicz J. Selected commensal bacteria change profiles of Helicobacter pylori-induced T cells via dendritic cell modulation. Helicobacter 2019; 24:e12614. [PMID: 31328382 DOI: 10.1111/hel.12614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 05/07/2019] [Accepted: 05/17/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND The mechanisms of downregulation of protective immunity against Helicobacter pylori (Hp) infection strongly depend on dendritic cell (DC)-induced T-lymphocyte differentiation pattern. Lactic acid bacteria (LAB) strains can modulate Hp-induced immunoresponse by changes in DC activation profiles. Here, we want to find out if the LAB-pulsed DCs will change Hp-induced T-cell responsiveness patterns. MATERIALS AND METHODS The naive peripheral CD4+ T cells were co-cultured with Hp CagA + pulsed monocyte-derived DCs (DC/CD4+ T cell) in the presence/absence of the feces-derived probiotics: antagonistic or non-antagonistic to Hp (Lactobacillus rhamnosus 900, Lr, Lactobacillus paracasei 915, Lp, respectively), as assessed by the agar slab method. The regulatory T-cell (Treg) population was assessed by flow cytometry, and IFN-γ, IL-12p70, IL-10, and IL-17A levels were evaluated by ELISA method. RESULTS The Hp-pulsed DC/CD4+ T-cell co-cultures were characterized by high IL-10, decreased IL-12p70 and IFN-γ levels, and elevated Treg population. In contrast, Lr-pulsed DC/CD4+ T-cell co-cultures expressed low IL-10, high IL-12p70 and IFN-γ levels and declined Treg population; this responsiveness pattern was not changed by Hp. The responsiveness pattern of the Lp/Hp-pulsed DC/CD4+ T-cell co-cultures did not differ from those pulsed with Hp alone. CONCLUSION In contrast to Lp, Lr probiotic strain overcomes Hp-mediated immune profile in the DC/T-cell co-cultures toward Th1 pattern and limited generation of Tregs in vitro. Lr may therefore be used as a component of anti-Hp treatment.
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Affiliation(s)
| | - Anna Helmin-Basa
- Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
| | - Andrzej Eljaszewicz
- Department of Regenerative Medicine and Immune Regulation, Medical University of Bialystok, Bialystok, Poland
| | - Lidia Gackowska
- Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
| | | | - Ilona Motyl
- Faculty of Biotechnology and Food Sciences, The Institute of Technology Fermentation and Microbiology, Technical University of Lodz, Łodz, Poland
| | - Marek Andryszczyk
- Faculty of Mechanical Engineering, University of Technology and Sciences in Bydgoszcz, Bydgoszcz, Poland
| | - Jolanta Wieczynska
- Department of Clinical Microbiology and Immunology, Children's Memorial Hospital, Warsaw, Poland
| | - Jacek Michalkiewicz
- Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland.,Department of Clinical Microbiology and Immunology, Children's Memorial Hospital, Warsaw, Poland
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The levels of CD4+CD25+ regulatory T cells in patients with allergic rhinitis. Allergol Select 2018; 2:144-150. [PMID: 31826046 PMCID: PMC6881876 DOI: 10.5414/alx01782e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 04/16/2015] [Indexed: 11/18/2022] Open
Abstract
Background: The involvement of CD4+CD25+ regulatory T cells (CD4+CD25+ TRegs) in allergic diseases was reported previously. However, it remains unclear whether CD4+CD25+ TRegs are involved in allergic rhinitis (AR). Methods: Fresh whole blood from 20 patients with AR and 16 healthy donors was used to investigate the frequency of CD4+CD25+ and CD4+CD25hi Treg cells using flow cytometry. In addition, serum total IgE (IU/mL) levels were determined using enzyme-linked immunosorbent assays. Results: Patients with AR had fewer CD4+CD25+ Treg cells (2.80 ± 1.36% vs. 3.94 ± 0.97%, P < 0.01) and CD4+CD25hi TRegs (1.53 ± 0·62% vs. 2.00 ± 0.52%, P < 0.05) than control subjects. The number of CD4+CD25+ and CD4+CD25hi TRegs was correlated negatively with total immunoglobulin E levels (r = –0.79, P < 0.01 and r = –0.61, P < 0.01, respectively). Conclusion: Deficient regulatory T cells might play a role in the development of AR.
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Afanasievа OI, Pylaeva EA, Klesareva EA, Potekhina AV, Provatorov SI, Afanasieva MI, Krasnikova TL, Masenko VP, Arefieva TI, Pokrovsky SN. [Lipoprotein(a), its autoantibodies, and circulating T lymphocyte subpopulations as independent risk factors for coronary artery atherosclerosis]. TERAPEVT ARKH 2017; 88:31-38. [PMID: 27735911 DOI: 10.17116/terarkh201688931-38] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
AIM To study the role of lipoprotein(a) [Lp(a)] as a potential autoantigen causing the activation of immunocompetent cells in atherosclerosis. SUBJECTS AND METHODS A total of 104 men with stable coronary artery (CA) disease and different degrees of progressive coronary atherosclerosis were examined. Clinical blood analysis was carried out and lymphocyte subpopulations (CD4+, Th1, Th17, and Treg) were determined using immunofluorescence and flow cytometry. In addition, the indicators of blood lipid composition, Lp(a), autoantibody (autoAb) titer to Lp(a), and low-density lipoproteins (LDL), and the lymphocyte activation marker sCD25 were also measured. RESULTS The Lp(a) level was shown to predict the severity of CA lesions (β=0.28, p<0.05), regardless of age, the level of cholesterol, different T-lymphocyte subpopulations, sCD25, and autoAb. A combination of the concentration of Lp(a) above 11.8 mg/dl, that of Th17 over 11.4∙103 cells/ml and the reduced levels of regulatory T cells and IL-10-producing CD4+ T cells showed a manifold increase in the risk of severe and progressive CA atherosclerosis. There was a direct correlation of the blood level of Th1 with that of IgG autoAb specific to all atherogenic apoB-containing lipoproteins, including Lp(a). There was an inverse correlations of the lymphocyte activation marker sCD25 with IgM anti-Lp(a) autoAb titers (r=-0.36; p<0.005), but this was less significant with autoAbs to native and oxidized LDL (r=-0.21 and r=-0.24; p<0.05, respectively). CONCLUSION The slightly elevated Lp(a) concentration along with changes in the level of T lymphocyte subpopulations was first shown to significantly potentiate the risk of progressive and multiple CA lesion in the examinees. The correlation of IgM anti-Lp(a) autoAb with the lymphocyte activation marker sCD25 and that of IgG anti-Lp(a) autoAb with Th1 have demonstrated that Lp(a) is involved in the autoimmune inflammatory processes in atherosclerosis.
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Affiliation(s)
- O I Afanasievа
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - E A Pylaeva
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - E A Klesareva
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - A V Potekhina
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - S I Provatorov
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - M I Afanasieva
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - T L Krasnikova
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - V P Masenko
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - T I Arefieva
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
| | - S N Pokrovsky
- Russian Cardiology Research and Production Complex, Ministry of Health of Russia, Moscow, Russia
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Khaliq F, Afzal N, Kashif M, Shahzad F. Relationship between percentage of regulatory T-cells and dental amalgam fillings. JOURNAL OF ORAL RESEARCH 2016. [DOI: 10.17126/joralres.2016.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Bołkun Ł, Rusak M, Eljaszewicz A, Pilz L, Radzikowska U, Łapuć I, Łuksza E, Dąbrowska M, Bodzenta-Łukaszyk A, Kłoczko J, Moniuszko M. Enhanced pretreatment CD25 expression on peripheral blood CD4+ T cell predicts shortened survival in acute myeloid leukemia patients receiving induction chemotherapy. Pharmacol Rep 2016; 68:12-9. [DOI: 10.1016/j.pharep.2015.05.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/25/2015] [Accepted: 05/26/2015] [Indexed: 12/21/2022]
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Inhibition of activation induced CD154 on CD4
+
CD25
−
cells: a valid surrogate for human Treg suppressor function. Immunol Cell Biol 2012; 90:812-21. [DOI: 10.1038/icb.2012.18] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Fricke S, Rothe K, Hilger N, Ackermann M, Oelkrug C, Fricke C, Schönfelder U, Niederwieser D, Emmrich F, Sack U. Allogeneic bone marrow grafts with high levels of CD4+CD25+FoxP3+ T cells can lead to engraftment failure. Cytometry A 2012; 81:476-88. [DOI: 10.1002/cyto.a.22061] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 02/08/2012] [Accepted: 03/29/2012] [Indexed: 01/02/2023]
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9
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Advanced flowcytometric analysis of regulatory T cells: CD127 downregulation early post stem cell transplantation and altered Treg/CD3+CD4+-ratio in severe GvHD or relapse. J Immunol Methods 2011; 373:36-44. [DOI: 10.1016/j.jim.2011.07.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Revised: 07/21/2011] [Accepted: 07/21/2011] [Indexed: 12/20/2022]
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Vallotton L, Hadaya K, Venetz JP, Buehler LH, Ciuffreda D, Nseir G, Codarri L, Villard J, Pantaleo G, Pascual M. Monitoring of CD4+CD25highIL-7Rαhigh activated T cells in kidney transplant recipients. Clin J Am Soc Nephrol 2011; 6:2025-33. [PMID: 21757642 DOI: 10.2215/cjn.09611010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND OBJECTIVES In humans, circulating CD4(+)CD25(high) T cells contain mainly regulatory T cells (Treg; FoxP3(+)IL-7Rα(low)), but a small subset is represented by activated effector T cells (Tact; FoxP3(-)IL-7Rα(high)). The balance between Tact and Treg may be important after transplantation. The aim of this study was first to analyze and correlate CD4(+)CD25(high) Tact and Treg with the clinical status of kidney transplant recipients and second to study prospectively the effect of two immunosuppressive regimens on Tact/Treg during the first year after transplantation. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS CD4(+)CD25(high) Tact and Treg were analyzed by flow cytometry, either retrospectively in 90 patients greater than 1 year after kidney transplantation (cross-sectional analysis) or prospectively in 35 patients receiving two immunosuppressive regimens after kidney transplantation (prospective analysis). RESULTS A higher proportion of Tact and a lower proportion of Treg were found in the majority of kidney recipients. In chronic humoral rejection, a strikingly higher proportion of Tact was present. A subgroup of stable recipients receiving calcineurin inhibitor-free immunosuppression (mycophenolate mofetil, azathioprine, or sirolimus) had Tact values that were similar to healthy individuals. In the prospective analysis, the proportion of Tact significantly increased in both immunosuppression groups during the first year after transplantation. CONCLUSIONS These data highlight distinct patterns in the proportion of circulating Tact depending on the clinical status of kidney recipients. Moreover, the prospective analysis demonstrated an increase in the proportion of Tact, regardless of the immunosuppressive regimen. The measurement of Tact, in addition to Treg, may become a useful immune monitoring tool after kidney transplantation.
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Affiliation(s)
- Laure Vallotton
- Service of Transplantation, Centre Hospitalier Universitaire Vaudois, Rue du Bugnon 46, 1011 Lausanne, Switzerland
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Pumputiene I, Emuzyte R, Siaurys A, Tamosiunas V, Valiulis A. CD4+CD25(high) Treg cells in peripheral blood during remission and exacerbation of allergic asthma in children. Acta Paediatr 2011; 100:1006-10. [PMID: 21786463 DOI: 10.1111/j.1651-2227.2011.02241.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
AIM To determine the percentage of CD4+CD25(high) Treg cells in peripheral bloodCD4+ T cells of allergic asthmatic children during disease remission and exacerbation. METHODS Peripheral blood mononuclear cells (PBMC) and serum samples were collected from 6- to 11-year-old children with mild-to-moderate allergic asthma (n = 34)and from healthy controls (n = 15). CD4+CD25(high) T cells in PBMC were detected by flow cytometry. Total and specific IgE in serum were analysed by enzyme-amplified chemiluminescence, and IL-2 was measured by ELISA. RESULTS There was no significant difference in CD4+CD25(high) T-cell proportions between asthmatic children in exacerbation and remission as compared with controls.CD4+CD25(high) T-cell percentages were not correlated with total and specific IgE. IL-2 was elevated in both disease remission and exacerbation but did not correlate significantly with CD4+CD25(high) T-cell percentages. CONCLUSION CD4+CD25(high) T-cell proportion in the peripheral blood of total CD4+T cells is not reduced in children with allergic IgE-mediated asthma and does not differ between disease remission and exacerbation.
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Affiliation(s)
- Ingrida Pumputiene
- Department of Immunology, State Research Institute Center for Innovative Medicine, Vilnius, Lithuania.
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12
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Effects of oral glucocorticoid therapy on CD4+CD25+CD127- and CD4+CD25high T cell levels in asthmatic patients. Inflammation 2011; 33:415-20. [PMID: 20300815 DOI: 10.1007/s10753-010-9200-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Our purpose was to evaluate the effects of short-term oral glucocorticoid (GC) treatment on frequencies of T cells with putative regulatory phenotype (namely, CD4+CD25+CD127- and CD4+CD25high) in patients with asthma exacerbations. In addition, we sought to determine frequencies of above T cell subsets in adult asthmatic patients in relation to disease severity and different treatment regimens. The analysis was performed in 62 patients with different stages of asthma and ten healthy controls. Polychromatic flow cytometry was applied to delineate T cells with CD4+CD25+CD127- and CD4+CD25high phenotype. Exhaled nitric oxide analysis was used to assess allergic airway inflammation. Levels of neither CD4+CD25+CD127- nor CD4+CD25high T cells were significantly altered after 7-day oral GC treatment. Importantly, there were no detectable differences in frequencies of those cells among studied groups of asthmatics with different severity of disease and healthy controls. Moreover, levels of CD4+CD25+CD127- and CD4+CD25high T cells in asthmatic patients were not correlated to exhaled nitric oxide concentrations. Our data indicate that neither effects of average doses of oral GC treatment nor disease severity are related to changes in frequencies of CD4+CD25+CD127- and CD4+CD25high T cells in adult asthmatic patients.
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Potekhina AV, Provatorov SI, Sokolov VO, Pylaeva EA, Masenko VP, Noeva EA, Kukhtina NB, Krasnikova TL, Arefieva TI. CD4(+)CD25(high)CD127(low) regulatory T cells in patients with stable angina and their dynamics after intracoronary sirolimus-eluting stent implantation. Hum Immunol 2011; 72:553-7. [PMID: 21530600 DOI: 10.1016/j.humimm.2011.03.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2010] [Revised: 03/24/2011] [Accepted: 03/31/2011] [Indexed: 01/24/2023]
Abstract
Rapamycin contributes to the expansion of regulatory T cells (Tregs) in vitro. We investigated CD4(+)CD25(high)CD127(low) Treg level dynamics as well as the major parameters of cell immunity and sCD25 and highly sensitive C-reactive protein (hsCRP) concentrations in the blood of patients after coronary stenting (CS) with sirolimus (rapamycin)-eluting stents (SES; n = 43). The relation between initial Treg values and the severity of coronary atherosclerosis was observed. Treg and sCD25 levels were increased 1 month after CS versus baseline values and versus data in the control group (coronary angiography [CA], n = 20). A positive correlation between Treg and sCD25 levels was reported, whereas no relation was observed with the length of SES implanted. HsCRP level was increased during the first 7 days and returned to baseline values 1 month after CS/CA. Treg content is lower in patients with multivessel CAD. Elevated levels of Tregs and sCD25 after SES implantation might occur because of the immunomodulating effect of rapamycin.
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Affiliation(s)
- Alexandra V Potekhina
- Russian Cardiology Research Center, Third Cherepkovskaya str., 15A, Moscow 121552, Russia.
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Venet F, Guignant C, Monneret G. Flow cytometry developments and perspectives in clinical studies: examples in ICU patients. Methods Mol Biol 2011; 761:261-275. [PMID: 21755455 DOI: 10.1007/978-1-61779-182-6_18] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Septic syndromes represent a major, although largely under-recognized, healthcare problem worldwide accounting for thousands of deaths every year. Although flow cytometry (FCM) remains a relatively confidential diagnostic tool, it is useful at every step of intensive care unit (ICU) patients' management. This review will focus on biomarkers measurable by FCM on a routine standardized basis and usable for the diagnosis of sepsis and for prediction of adverse outcome, occurrence of secondary nosocomial infections or guidance of putative immunotherapy relative to innate and adaptive immune dysfunctions in ICU patients. Regarding early diagnosis of infection, neutrophil CD64 has been shown to be a highly sensitive and specific marker for systemic infection and sepsis in adults, neonates, and children. A diminished monocyte HLA-DR expression is a reliable marker for the development of monocyte anergy, secondary nosocomial infection, and death in critically ill patients. Finally, the measurement of an increased CD4(+)CD25(+)CD127(low) regulatory T cell percentage may represent a reliable marker for the diagnosis of lymphocyte dysfunctions in these patients. These stainings can be performed using lyse-no-wash methods and results are available within 1 h. Ideally, these biomarkers should be part of a panel helping to define ICU patients' immune status. In the specific clinical context of ICU patients' monitoring, the increasing potential of FCM is further illustrated by the use of the biomarkers listed above as stratification tools in preliminary clinical studies. The next critical step is to use these standardized FCM protocols in large multicentric clinical trials testing individualized immunotherapy. Importantly, many other markers of immune dysfunction are currently under development that could further enable the administration of targeted individualized therapy in ICU patients.
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Affiliation(s)
- Fabienne Venet
- Laboratoire d'Immunologie, Hopital E. Herriot, Hospices Civils de Lyon, 69437, Lyon Cedex 03, France.
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Liang Q, Guo L, Gogate S, Karim Z, Hanifi A, Leung DY, Gorska MM, Alam R. IL-2 and IL-4 stimulate MEK1 expression and contribute to T cell resistance against suppression by TGF-beta and IL-10 in asthma. THE JOURNAL OF IMMUNOLOGY 2010; 185:5704-13. [PMID: 20926789 DOI: 10.4049/jimmunol.1000690] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The T cell-driven airway inflammation in chronic asthma is uninhibited and sustained. We examined the resistance of T cells from asthmatic patients against suppression by TGF-β, IL-10 and glucocorticoids and explored its signaling mechanism. CD4(+)CD25(-) T cells from allergic asthmatic subjects demonstrated increased TCR-stimulated proliferation as compared with healthy and chronic obstructive pulmonary disease controls. This proliferation was resistant to inhibition by TGF-β, IL-10, and dexamethasone and to anergy induction. CD4 T cells from asthmatic patients, but not chronic obstructive pulmonary disease, allergic rhinitis, and healthy subjects, showed increased expression of MEK1, heightened phosphorylation of ERK1/2, and increased levels of c-Fos. IL-2 and IL-4 stimulated the expression of MEK1 and c-Fos and induced T cell resistance. The inhibition of MEK1 reversed, whereas induced expression of c-Fos and JunB promoted T cell resistance against TGF-β- and IL-10-mediated suppression. We have uncovered an IL-2- and IL-4-driven MEK1 induction mechanism that results in heightened ERK1/2 activation in asthmatic T cells and make them resistant to certain inhibitory mechanisms.
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Affiliation(s)
- Qiaoling Liang
- Division of Allergy and Immunology, Department of Medicine and Pediatrics, National Jewish Health and University of Colorado at Denver, Denver, CO 80206, USA
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Martin S, Agarwal R, Murugaiyan G, Saha B. CD40 expression levels modulate regulatory T cells in Leishmania donovani infection. THE JOURNAL OF IMMUNOLOGY 2010; 185:551-9. [PMID: 20525887 DOI: 10.4049/jimmunol.0902206] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Dendritic cell (DC)-expressed CD40 is shown to play crucial roles in eliciting effector T cell responses, primarily the proinflammatory CD4(+) Th subsets and cytotoxic CD8(+) T cells that eliminate various infections and tumors, respectively. In contrast, DCs are also implied in the generation of regulatory T cells (Tregs) that counteract the functions of the proinflammatory Th subsets and exacerbate infections. However, the role of DC-expressed CD40 in the generation of Tregs is unknown. In this study, we generated bone marrow-derived DCs from mice (on a BALB/c background) expressing different levels of CD40 and tested their relative efficiency in generating Tregs. We observed that low levels of CD40 expression were required for efficient Treg generation. DCs expressing low levels of CD40 induced Tregs, whereas DCs expressing high levels of CD40 induced effector T cells, possibly CD8(+)CD40(+) T cells with a contraregulatory activity; the adoptive transfer of the former DC exacerbated whereas the latter significantly reduced Leishmania donovani infection in BALB/c mice. Similarly, priming of mice with leishmanial Ag-pulsed DCs expressing high levels of CD40 induced host protection against L. donovani challenge infection. In contrast, priming with the low CD40-expressing DC resulted in aggravated infection as compared with the control mice. The results establish that CD40 can play differential roles in Treg differentiation and determine the course of infection. We demonstrate that the knowledge can be efficiently used in adoptive cell transfer therapy against an infectious disease.
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Affiliation(s)
- Sunil Martin
- National Centre for Cell Science, Ganeshkhind, Pune, India
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Venet F, Chung CS, Kherouf H, Geeraert A, Malcus C, Poitevin F, Bohé J, Lepape A, Ayala A, Monneret G. Increased circulating regulatory T cells (CD4(+)CD25 (+)CD127 (-)) contribute to lymphocyte anergy in septic shock patients. Intensive Care Med 2008; 35:678-86. [PMID: 18946659 DOI: 10.1007/s00134-008-1337-8] [Citation(s) in RCA: 224] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Accepted: 10/04/2008] [Indexed: 12/16/2022]
Abstract
PURPOSE Sepsis syndrome represents the leading cause of death in intensive care unit. Patients present features consistent with a decline in immune responsiveness potentially contributing to mortality. We investigated whether CD4(+)CD25(+) regulatory T cells (Treg) participate in the induction of lymphocyte anergy after sepsis. METHOD Observational study in septic shock patients and experimental study in mice. RESULTS We took advantage of the recently described flow cytometric gating strategy using the measurement of CD25 and CD127 expressions for monitoring Treg (CD4(+)CD25(+)CD127(-)Foxp3(+)). In patients the increased circulating Treg percentage significantly correlated with a decreased lympho-proliferative response. In a murine model of sepsis mimicking these observations, the ex vivo downregulation of Foxp3 expression using siRNA was associated with a restoration of this response. CONCLUSION The relative increase in circulating Treg might play a role in lymphocyte anergy described after septic shock and represent a standardizable surrogate marker of declining proliferative capacity after sepsis.
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Affiliation(s)
- Fabienne Venet
- Division of Surgical Research, Rhode Island Hospital, Brown University, Providence, RI, USA
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Determination of blood leukocyte concentration with constant volume acquisition on a flow cytometer is comparable to individualized single platform testing with beads as internal reference standard. J Immunol Methods 2008; 338:58-62. [PMID: 18680746 DOI: 10.1016/j.jim.2008.07.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2008] [Revised: 07/04/2008] [Accepted: 07/10/2008] [Indexed: 01/16/2023]
Abstract
Flow cytometers have a constant flow rate. This enables flow cytometers to measure leukocyte concentrations in a determined volume by acquiring data at a fixed rate over a fixed time and is called constant volume acquisition (CVA). The volume aspirated by a FACS Calibur flow cytometer in 4 min at a high rate has a median of 163 microl (IQR 156-170) with TruCount tubes. Leukocyte concentrations of 26 healthy volunteers were measured twice on up to four occasions with a Bürker-Türk chamber, by single platform technology (SPT) with TruCount tubes and on the same data set using CVA. Total leukocyte concentrations determined by CVA correlated better with measurements in a Bürker-Türk (BT) chamber than with SPT. Concentrations determined with CVA were 1.86% higher than with BT whereas SPT data were 5.35% higher than BT (p<0.001), and 3.36% higher than CVA (p<0.001). At leukocyte concentrations <6 million/ml SPT correlated better with BT than CVA. The SPT measurement may be more variable because it depends on measurement of the number of beads aliquoted, the number of beads and leukocytes aspirated, where both BT counting and CVA measurements only depend on the number of leukocytes counted. CVA with PanLeukoGating can be established using microscopy as a reference, and is comparable to BT chamber and SPT determination. Leukocyte concentrations can be measured with CVA on flow cytometers in research and clinical settings.
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