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Wang S, Zeng Q, Gao H, Gao S, Dai R, Hu Z. Expression of proBDNF/p75 NTR in peripheral blood lymphocytes of patients with sepsis and its impact on lymphocyte differentiation. ZHONG NAN DA XUE XUE BAO. YI XUE BAN = JOURNAL OF CENTRAL SOUTH UNIVERSITY. MEDICAL SCIENCES 2023; 48:1629-1638. [PMID: 38432853 PMCID: PMC10929956 DOI: 10.11817/j.issn.1672-7347.2023.230179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Indexed: 03/05/2024]
Abstract
OBJECTIVES Sepsis is a life-threatening organ dysfunction caused by the host's imbalanced response to infection. Due to lack of effective treatments, it has always been the difficulty and focus of clinical treatment of sepsis. Studies have shown that pro-brain-derived neurotrophic factor (proBDNF) binds to the high-affinity total neurotrophic factor p75 neurotrophin receptor (p75NTR), which activates downstream signaling cascades and disrupts immunological inflammation and plays an important role in the progression of sepsis. This study aims to explore the expression changes of lymphocyte-derived proBDNF/p75NTR in patients with sepsis and its effect on lymphocyte differentiation. METHODS From the healthy donors (control group, n=40) and sepsis patients (sepsis group, n=40) admitted to the hospital for the first time, peripheral blood samples and blood routine clinical detection indicators were obtained. By using flow cytometry, the proportion of lymphocyte subsets and their expression of proBDNF/p75NTR were examined. The peripheral blood lymphocytes were isolated from the control group and incubated with lipopolysaccharide (LPS). Flow cytometry analysis technology was used to detect the expression of proBDNF/p75NTR on LPS-treated lymphocyte subsets. On this basis, we investigated the effects on lymphocyte differentiation by inhibiting p75NTR. RESULTS White blood cell count, neutrophil count, and neutrophil percentage of the patients in the sepsis group at admission were significantly higher than those in the control group; on the contrary, lymphocyte count and lymphocyte percentage in the sepsis group were lower than those in the control group (all P<0.001). The patients in the sepsis group had considerably greater neutrophil/lymphocyte and monocyte/lymphocyte ratios than those in the control group (both P<0.05). In the peripheral blood of sepsis patients, proBDNF expression was upregulated on CD19+ B cells, whereas p75NTR expression was elevated on B cells, CD4+ T cells, and CD8+ T cells (all P<0.05). ProBDNF/p75NTR expression was upregulated by LPS stimulation in vitro in peripheral blood cells of the control group (P<0.05), and this tendency was similar to the expression alterations in peripheral lymphocytes of the sepsis group. Inhibition of p75NTR increased CD4+ T cell and CD19+ B cell percentages, cytokine expression of IL-4 and IL-10, and reduced IL-1β and IL-6 production (all P<0.05). CONCLUSIONS The immunosuppressive state of sepsis patients is indicated by a reduction in lymphocyte count and an increase in the proportion of inactive neutrophils. ProBDNF/p75NTR expression is upregulated in the peripheral blood lymphocytes of sepsis patients, and p75NTR inhibition may control lymphocyte differentiation involved in sepsis progression.
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Affiliation(s)
- Shuang Wang
- Department of Anesthesiology, Second Xiangya Hospital, Central South University, Changsha 410011.
- Department of Clinical Laboratory, Xiangya Hospital, Central South University, Changsha 410008.
| | - Qiuming Zeng
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008.
| | - Hailiang Gao
- Department of Human Resources, Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Shan Gao
- Department of Anesthesiology, Second Xiangya Hospital, Central South University, Changsha 410011
| | - Ruping Dai
- Department of Anesthesiology, Second Xiangya Hospital, Central South University, Changsha 410011
| | - Zhaolan Hu
- Department of Anesthesiology, Second Xiangya Hospital, Central South University, Changsha 410011.
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Ru S, Luo Y. The association and prognostic value of systemic inflammatory response index with short and long-term mortality in patients with sepsis. Medicine (Baltimore) 2023; 102:e33967. [PMID: 37478261 PMCID: PMC10662841 DOI: 10.1097/md.0000000000033967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 05/19/2023] [Indexed: 07/23/2023] Open
Abstract
This study evaluated the association and prognostic significance of the systemic inflammation response index (SIRI) with mortality in sepsis. In this cohort study, the sepsis patients were retrieved from the Medical Information Mart for Intensive Care III (MIMIC-III) and MIMIC-IV intensive care unit (ICU) databases. SIRI was calculated by using the neutrophil, monocyte, and lymphocyte counts. The outcomes were 28-day mortality, 1-year mortality, and 28 days to 1-year mortality. The Cox proportional hazards model with a hazard ratio (HR) and a 95% confidence interval (CI) was used to investigate the association and prognostic value of SIRI with mortality in sepsis. Subgroup analyses of the associations of SIRI with 28-day and 1-year mortality in sepsis were based on age, gender, Simplified Acute Physiology Score II (SAPSII), Sequential Organ Failure Assessment (SOFA), and presence or absence of septic shock. The receiver operating characteristic (ROC) curve was used to compare the predictive performances of SIRI, SOFA and SAPS II for mortality in sepsis. Of the 4239 patients included, 1339 patients suffered from 28-day mortality, 2085 patients suffering from 1-year mortality, and 746 (25.72%) suffered from 28 days to 1-year mortality. High SIRI levels exhibited higher risks of 28-day mortality (HR: 1.15, 95% CI: 1.03-1.29, P = .010), 1-year mortality (HR: 1.14, 95% CI: 1.04-1.24, P = .003), and 28 days to 1-year mortality (HR: 1.16, 95% CI: 1.01-1.35, P = .047) in sepsis. A higher SIRI was reported related to 28-day mortality and 1-year mortality in sepsis patients with female gender, with SOFA < 8, with SAPS II < 44, and in sepsis patients without sepsis shock. The AUC of SIRS, SOFA, and SAPS II in predicting 28-day mortality in sepsis were 0.726, 0.591, and 0.644, respectively. The AUC of SIRI in predicting 1-year mortality in sepsis was 0.761, higher than the AUC values of SOFA and SAPS II. A higher AUC value of SIRI compared with SOFA, and SAPS II in predicting 28 days to 1-year mortality was observed. Elevated SIRI was associated with an increased risk of mortality in sepsis. SIRI is an independent prognostic biomarker of mortality in sepsis.
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Affiliation(s)
- Shuyan Ru
- Critical care department, Huishan 3rd people’s hospital of Wuxi city, Wuxi, P.R. China
| | - Yajun Luo
- Science and Technology Division, Aerospace Medical & Healthcare Technology Group Co., LTD., Beijing, P.R. China
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Riça IG, Joughin BA, Teke ME, Emmons TR, Griffith A, Cahill LA, Banner-Goodspeed V, Robson SC, Hernandez JM, Segal BH, Otterbein LE, Hauser CJ, Lederer JA, Yaffe MB. Neutrophil heterogeneity and emergence of a distinct population of CD11b/CD18-activated low-density neutrophils after trauma. J Trauma Acute Care Surg 2023; 94:187-196. [PMID: 36694330 PMCID: PMC9881754 DOI: 10.1097/ta.0000000000003823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
INTRODUCTION Multiple large clinical trauma trials have documented an increased susceptibility to infection after injury. Although neutrophils (polymorphonuclear leukocytes [PMNs]) were historically considered a homogeneous cell type, we hypothesized that injury could alter neutrophil heterogeneity and predispose to dysfunction. To explore whether trauma modifies PMN heterogeneity, we performed an observational mass-spectrometry-based cytometry study on total leukocytes and low-density PMNs found in the peripheral blood mononuclear cell fraction of leukocytes from healthy controls and trauma patients. METHODS A total of 74 samples from 12 trauma patients, each sampled at 1 or more time points, and matched controls were fractionated and profiled by mass-spectrometry-based cytometry using a panel of 44 distinct markers. After deconvolution and conservative gating on neutrophils, data were analyzed using Seurat, followed by clustering of principal components. RESULTS Eleven distinct neutrophil populations were resolved in control and trauma neutrophils based on differential protein surface marker expression. Trauma markedly altered the basal heterogeneity of neutrophil subgroups seen in the control samples, with loss of a dominant population of resting neutrophils marked by high expression of C3AR and low levels of CD63, CD64, and CD177 (cluster 1), and expansion of two alternative neutrophil populations, one of which is marked by high expression of CD177 with suppression of CD10, CD16, C3AR, CD63, and CD64 (cluster 6). Remarkably, following trauma, a substantially larger percentage of neutrophils sediment in the monocyte fraction. These low-density neutrophils bear markers of functional exhaustion and form a unique trauma-induced population (cluster 9) with markedly upregulated expression of active surface adhesion molecules (activated CD11b/CD18), with suppression of nearly all other surface markers, including receptors for formyl peptides, leukotrienes, chemokines, and complement. CONCLUSION Circulating neutrophils demonstrate considerable evidence of functional heterogeneity that is markedly altered by trauma. Trauma induces evolution of a novel, exhausted, low-density neutrophil population with immunosuppressive features.
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Affiliation(s)
- Ingred Goretti Riça
- Departments of Biological Engineering and Biology, David H. Koch Institute for Integrative Cancer Research, and Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Brian A. Joughin
- Departments of Biological Engineering and Biology, David H. Koch Institute for Integrative Cancer Research, and Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Martha E. Teke
- Surgical Oncology Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Tiffany R. Emmons
- Departments of Biological Engineering and Biology, David H. Koch Institute for Integrative Cancer Research, and Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Alec Griffith
- Department of Surgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115 USA
| | - Laura A. Cahill
- Department of Surgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115 USA
| | - Valerie Banner-Goodspeed
- Department of Anesthesia, Critical Care, and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115 USA
| | - Simon C. Robson
- Department of Anesthesia, Critical Care, and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115 USA
| | - Jonathan M. Hernandez
- Surgical Oncology Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Brahm H. Segal
- Department of Medicine, Roswell Park Comprehensive Cancer Center, University of Buffalo School of Medicine, Buffalo, NY14263 USA
| | - Leo E. Otterbein
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115 USA
| | - Carl J. Hauser
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115 USA
| | - James A. Lederer
- Department of Surgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115 USA
| | - Michael B. Yaffe
- Departments of Biological Engineering and Biology, David H. Koch Institute for Integrative Cancer Research, and Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Surgical Oncology Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115 USA
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Ismailova A, Salehi-Tabar R, Dimitrov V, Memari B, Barbier C, White JH. Identification of a forkhead box protein transcriptional network induced in human neutrophils in response to inflammatory stimuli. Front Immunol 2023; 14:1123344. [PMID: 36756115 PMCID: PMC9900176 DOI: 10.3389/fimmu.2023.1123344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 01/03/2023] [Indexed: 01/25/2023] Open
Abstract
Introduction Neutrophils represent the largest proportion of circulating leukocytes and, in response to inflammatory stimuli, are rapidly recruited to sites of infection where they neutralize pathogens. Methods and results We have identified a novel neutrophil transcription network induced in response to inflammatory stimuli. We performed the first RNAseq analysis of human neutrophils exposed to lipopolysaccharide (LPS), followed by a meta-analysis of our dataset and previously published studies of LPS-challenged neutrophils. This revealed a robustly enhanced transcriptional network driven by forkhead box (FOX) transcription factors. The network is enriched in genes encoding proinflammatory cytokines and transcription factors, including MAFF and ATF3, which are implicated in responses to stress, survival and inflammation. Expression of transcription factors FOXP1 and FOXP4 is induced in neutrophils exposed to inflammatory stimuli, and potential FOXP1/FOXP4 binding sites were identified in several genes in the network, all located in chromatin regions consistent with neutrophil enhancer function. Chromatin immunoprecipitation (ChIP) assays in neutrophils confirmed enhanced binding of FOXP4, but not FOXP1, to multiple sites in response to LPS. Binding to numerous motifs and transactivation of network genes were also observed when FOXP proteins were transiently expressed in HEK293 cells. In addition to LPS, the transcriptional network is induced by other inflammatory stimuli, indicating it represents a general neutrophil response to inflammation. Discussion Collectively, these findings reveal a role for the FOXP4 transcription network as a regulator of responses to inflammatory stimuli in neutrophils.
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Affiliation(s)
- Aiten Ismailova
- Department of Physiology, McGill University, Montreal, QC, Canada
| | | | - Vassil Dimitrov
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - Babak Memari
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - Camille Barbier
- Department of Physiology, McGill University, Montreal, QC, Canada
| | - John H. White
- Department of Physiology, McGill University, Montreal, QC, Canada,Department of Medicine, McGill University, Montreal, QC, Canada,*Correspondence: John H. White,
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5
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van Baarle FLF, de Bruin S, Bulle EB, van Mourik N, Lim EHT, Tuip-de Boer AM, Bongers A, de Wissel MB, van Bruggen R, de Korte D, Vermeulen C, Tan KW, Jonkers RE, Bonta PI, Lutter R, Dekker T, Dierdorp BS, Peters AL, Biemond BJ, Vlaar APJ. Aged versus fresh autologous platelet transfusion in a two-hit healthy volunteer model of transfusion-related acute lung injury. Transfusion 2022; 62:2490-2501. [PMID: 36300793 PMCID: PMC10092071 DOI: 10.1111/trf.17157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/13/2022] [Accepted: 09/16/2022] [Indexed: 12/13/2022]
Abstract
BACKGROUND Transfusion-related acute lung injury (TRALI) is a severe complication of blood transfusion that is thought of as a two-hit event: first the underlying patient condition (e.g., sepsis), and then the transfusion. Transfusion factors include human leukocyte antigen antibodies or biologic response modifiers (BRMs) accumulating during storage. Preclinical studies show an increased TRALI risk with longer stored platelets, clinical studies are conflicting. We aim to discover whether longer platelet concentrate (PC) storage time increases TRALI risk in a controlled human experiment. STUDY DESIGN AND METHODS In a randomized controlled trial, 18 healthy male volunteers received a first hit of experimental endotoxemia (2 ng/kg lipopolysaccharide), and a second hit of fresh (2-day old) or aged (7-day old) autologous PC, or physiological saline. After 6 h, changes in TRALI pathways were determined using spirometry, chest X-ray, and bronchoalveolar lavage (BAL). RESULTS All subjects reacted adequately to lipopolysaccharide infusion and satisfied SIRS criteria (increased pulse [>90/min] and temperature [>38°C]). There were no differences between the saline, fresh, and aged PC groups in BAL-fluid protein (95 ± 33 μg/ml; 83 ± 21 μg/ml and 104 ± 29 μg/ml, respectively) and relative neutrophil count (1.5 ± 0.5%; 1.9 ± 0.8% and 1.3 ± 0.8%, respectively), nor in inflammatory BAL-fluid BRMs (Interleukin-6, CXCL8, TNFα , and myeloperoxidase), clinical respiratory parameters, and spirometry results. All chest X-rays were normal. CONCLUSIONS In a human endotoxemia model of autologous platelet transfusion, with an adequate first hit and platelet storage lesion, transfusion of 7-day-old PC does not increase pulmonary inflammation compared with 2-day-old PC.
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Affiliation(s)
- Floor L F van Baarle
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Sanne de Bruin
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Esther B Bulle
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Niels van Mourik
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Endry H T Lim
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Anita M Tuip-de Boer
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Annabel Bongers
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Marit B de Wissel
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Robin van Bruggen
- Department of Blood Cell Research, Sanquin Blood Supply, Amsterdam, The Netherlands
| | - Dirk de Korte
- Department of Blood Cell Research, Sanquin Blood Supply, Amsterdam, The Netherlands.,Department of Product and Process Development, Sanquin Blood Supply, Amsterdam, The Netherlands
| | - Christie Vermeulen
- Department of Product and Process Development, Sanquin Blood Supply, Amsterdam, The Netherlands
| | - Khik Wie Tan
- Sanquin Blood Bank Location Leiden, Sanquin Blood Supply, Amsterdam, The Netherlands
| | - René E Jonkers
- Department of Respiratory Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Peter I Bonta
- Department of Respiratory Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - René Lutter
- Department of Respiratory Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Experimental Immunology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Amsterdam Institute for Infection and Immunity, Inflammatory Diseases, Amsterdam, The Netherlands
| | - Tamara Dekker
- Department of Experimental Immunology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Barbara S Dierdorp
- Department of Experimental Immunology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Anna L Peters
- Department of Anesthesiology, UMC Utrecht, Utrecht, The Netherlands
| | - Bart J Biemond
- Department of Hematology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Alexander P J Vlaar
- Laboratory of Experimental Intensive Care and Anesthesiology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
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6
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Leligdowicz A, Kamm J, Kalantar K, Jauregui A, Vessel K, Caldera S, Serpa PH, Abbott J, Fang X, Tian X, Prakash A, Kangelaris KN, Liu KD, Calfee CS, Langelier C, Matthay MA. Functional Transcriptomic Studies of Immune Responses and Endotoxin Tolerance in Early Human Sepsis. Shock 2022; 57:180-190. [PMID: 35066510 PMCID: PMC9246838 DOI: 10.1097/shk.0000000000001915] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Limited studies have functionally evaluated the heterogeneity in early ex vivo immune responses during sepsis. Our aim was to characterize early sepsis ex vivo functional immune response heterogeneity by studying whole blood endotoxin responses and derive a transcriptional metric of ex vivo endotoxin response. METHODS Blood collected within 24 h of hospital presentation from 40 septic patients was divided into two fractions and incubated with media (unstimulated) or endotoxin. Supernatants and cells were isolated, and responses measured using: supernatant cytokines, lung endothelial permeability after supernatant exposure, and RNA expression. A transcriptomic signature was derived in unstimulated cells to predict the ex vivo endotoxin response. The signature was tested in a separate cohort of 191 septic patients to evaluate for association with clinical outcome. Plasma biomarkers were quantified to measure in vivo host inflammation. RESULTS Ex vivo response to endotoxin varied and was unrelated to immunosuppression, white blood cell count, or the causative pathogen. Thirty-five percent of patients demonstrated a minimal response to endotoxin, suggesting early immunosuppression. High ex vivo cytokine production by stimulated blood cells correlated with increased in vitro pulmonary endothelial cell permeability and was associated with attenuated in vivo host inflammation. A four-gene signature of endotoxin response detectable without the need for a functional assay was identified. When tested in a separate cohort of septic patients, its expression was inversely associated with hospital mortality. CONCLUSIONS An attenuated ex vivo endotoxin response in early sepsis is associated with greater host in vivo inflammation and a worse clinical outcome.
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Affiliation(s)
- Aleksandra Leligdowicz
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
- Department of Medicine, Critical Care Medicine, Robarts Research Institute, University of Western Ontario, London, Canada
| | - Jack Kamm
- Chan Zuckerberg Biohub, San Francisco, California, USA
| | | | - Alejandra Jauregui
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
| | - Kathryn Vessel
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
| | - Saharai Caldera
- Chan Zuckerberg Biohub, San Francisco, California, USA
- Division of Infectious Diseases, Department of Medicine, University of California, San Francisco, California, USA
| | - Paula Hayakawa Serpa
- Chan Zuckerberg Biohub, San Francisco, California, USA
- Division of Infectious Diseases, Department of Medicine, University of California, San Francisco, California, USA
| | - Jason Abbott
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
| | - Xiaohui Fang
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
| | - Xiaoli Tian
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, and San Francisco General Hospital, San Francisco, CA, United States
| | - Arun Prakash
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, and San Francisco General Hospital, San Francisco, CA, United States
| | - Kirsten Neudoerffer Kangelaris
- Department of Medicine, Division of Hospital Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Kathleen D. Liu
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
- Department of Medicine, Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Carolyn S. Calfee
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
- Department of Medicine, Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Charles Langelier
- Chan Zuckerberg Biohub, San Francisco, California, USA
- Division of Infectious Diseases, Department of Medicine, University of California, San Francisco, California, USA
| | - Michael A. Matthay
- Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
- Department of Medicine, Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, University of California-San Francisco, San Francisco, California, USA
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7
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Keane C, Coalter M, Martin-Loeches I. Immune System Disequilibrium-Neutrophils, Their Extracellular Traps, and COVID-19-Induced Sepsis. Front Med (Lausanne) 2021; 8:711397. [PMID: 34485339 PMCID: PMC8416266 DOI: 10.3389/fmed.2021.711397] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 07/27/2021] [Indexed: 12/15/2022] Open
Abstract
Equilibrium within the immune system can often determine the fate of its host. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the pathogen responsible for the coronavirus disease 2019 (COVID-19) pandemic. Immune dysregulation remains one of the main pathophysiological components of SARS-CoV-2-associated organ injury, with over-activation of the innate immune system, and induced apoptosis of adaptive immune cells. Here, we provide an overview of the innate immune system, both in general and relating to COVID-19. We specifically discuss "NETosis," the process of neutrophil release of their extracellular traps, which may be a more recently described form of cell death that is different from apoptosis, and how this may propagate organ dysfunction in COVID-19. We complete this review by discussing Stem Cell Therapies in COVID-19 and emerging COVID-19 phenotypes, which may allow for more targeted therapy in the future. Finally, we consider the array of potential therapeutic targets in COVID-19, and associated therapeutics.
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Affiliation(s)
- Colm Keane
- Department of Anaesthesia and Intensive Care, St. James's Hospital, Dublin, Ireland
- Multidisciplinary Intensive Care Research Organization (MICRO), Trinity College Dublin, Dublin, Ireland
| | - Matthew Coalter
- Department of Anaesthesia and Intensive Care, St. James's Hospital, Dublin, Ireland
| | - Ignacio Martin-Loeches
- Department of Anaesthesia and Intensive Care, St. James's Hospital, Dublin, Ireland
- Multidisciplinary Intensive Care Research Organization (MICRO), Trinity College Dublin, Dublin, Ireland
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8
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Hardisty GR, Llanwarne F, Minns D, Gillan JL, Davidson DJ, Gwyer Findlay E, Gray RD. High Purity Isolation of Low Density Neutrophils Casts Doubt on Their Exceptionality in Health and Disease. Front Immunol 2021; 12:625922. [PMID: 34168640 PMCID: PMC8217868 DOI: 10.3389/fimmu.2021.625922] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 05/13/2021] [Indexed: 12/12/2022] Open
Abstract
Low density neutrophils (LDNs) are described in a number of inflammatory conditions, cancers and infections and associated with immunopathology, and a mechanistic role in disease. The role of LDNs at homeostasis in healthy individuals has not been investigated. We have developed an isolation protocol that generates high purity LDNs from healthy donors. Healthy LDNs were identical to healthy normal density neutrophils (NDNs), aside from reduced neutrophil extracellular trap formation. CD66b, CD16, CD15, CD10, CD54, CD62L, CXCR2, CD47 and CD11b were expressed at equivalent levels in healthy LDNs and NDNs and underwent apoptosis and ROS production interchangeably. Healthy LDNs had no differential effect on CD4+ or CD8+ T cell proliferation or IFNγ production compared with NDNs. LDNs were generated from healthy NDNs in vitro by activation with TNF, LPS or fMLF, suggesting a mechanism of LDN generation in disease however, we show neutrophilia in people with Cystic Fibrosis (CF) was not due to increased LDNs. LDNs are present in the neutrophil pool at homeostasis and have limited functional differences to NDNs. We conclude that increased LDN numbers in disease reflect the specific pathology or inflammatory environment and that neutrophil density alone is inadequate to classify discrete functional populations of neutrophils.
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Affiliation(s)
- Gareth R Hardisty
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| | - Frances Llanwarne
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| | - Danielle Minns
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| | - Jonathan L Gillan
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| | - Donald J Davidson
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| | - Emily Gwyer Findlay
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| | - Robert D Gray
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
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9
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Shen X, Cao K, Zhao Y, Du J. Targeting Neutrophils in Sepsis: From Mechanism to Translation. Front Pharmacol 2021; 12:644270. [PMID: 33912055 PMCID: PMC8072352 DOI: 10.3389/fphar.2021.644270] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 02/08/2021] [Indexed: 12/13/2022] Open
Abstract
Sepsis is a life-threatening condition caused by a dysregulated host response to infection. Although our understanding in the pathophysiological features of sepsis has increased significantly during the past decades, there is still lack of specific treatment for sepsis. Neutrophils are important regulators against invading pathogens, and their role during sepsis has been studied extensively. It has been suggested that the migration, the antimicrobial activity, and the function of neutrophil extracellular traps (NETs) have all been impaired during sepsis, which results in an inappropriate response to primary infection and potentially increase the susceptibility to secondary infection. On the other hand, accumulating evidence has shown that the reversal or restoration of neutrophil function can promote bacterial clearance and improve sepsis outcome, supporting the idea that targeting neutrophils may be a promising strategy for sepsis treatment. In this review, we will give an overview of the role of neutrophils during sepsis and discuss the potential therapeutic strategy targeting neutrophils.
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Affiliation(s)
- Xiaofei Shen
- Faculty of Hepato-Biliary-Pancreatic Surgery, Chinese People's Liberation Army (PLA) General Hospital, Beijing, China
| | - Ke Cao
- Department of Critical Care Medicine, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China
| | - Yang Zhao
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Junfeng Du
- Medical Department of General Surgery, The 1st Medical Center of Chinese PLA General Hospital, Beijing, China.,Department of General Surgery, The 7th Medical Center, Chinese PLA General Hospital, Beijing, China.,The Second School of Clinical Medicine, Southern Medical University, Guangdong, China
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10
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Allaeys I, Ribeiro de Vargas F, Bourgoin SG, Poubelle PE. Human Inflammatory Neutrophils Express Genes Encoding Peptidase Inhibitors: Production of Elafin Mediated by NF-κB and CCAAT/Enhancer-Binding Protein β. THE JOURNAL OF IMMUNOLOGY 2021; 206:1943-1956. [PMID: 33762327 DOI: 10.4049/jimmunol.2000852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 02/11/2021] [Indexed: 11/19/2022]
Abstract
The concept of plasticity of neutrophils is highlighted by studies showing their ability to transdifferentiate into APCs. In this regard, transdifferentiated neutrophils were found at inflammatory sites of autoimmune arthritis (AIA). Exposure of neutrophils to inflammatory stimuli prolongs their survival, thereby favoring the acquisition of pathophysiologically relevant phenotypes and functions. By using microarrays, quantitative RT-PCR, and ELISAs, we showed that long-lived (LL) neutrophils obtained after 48 h of culture in the presence of GM-CSF, TNF, and IL-4 differentially expressed genes related to apoptosis, MHC class II, immune response, and inflammation. The expression of anti-inflammatory genes mainly of peptidase inhibitor families is upregulated in LL neutrophils. Among these, the PI3 gene encoding elafin was the most highly expressed. The de novo production of elafin by LL neutrophils depended on a synergism between GM-CSF and TNF via the activation and cooperativity of C/EBPβ and NF-κB pathways, respectively. Elafin concentrations were higher in synovial fluids (SF) of patients with AIA than in SF of osteoarthritis. SF neutrophils produced more elafin than blood counterparts. These results are discussed with respect to implications of neutrophils in chronic inflammation and the potential influence of elafin in AIA.
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Affiliation(s)
- Isabelle Allaeys
- Infectious Diseases and Immunity Research Division, Department of Medicine, Centre Hospitalier Universitaire de Québec-Université Laval Research Center, Quebec City, Quebec G1V 4G2, Canada
| | - Flavia Ribeiro de Vargas
- Infectious Diseases and Immunity Research Division, Department of Medicine, Centre Hospitalier Universitaire de Québec-Université Laval Research Center, Quebec City, Quebec G1V 4G2, Canada
| | - Sylvain G Bourgoin
- Infectious Diseases and Immunity Research Division, Department of Medicine, Centre Hospitalier Universitaire de Québec-Université Laval Research Center, Quebec City, Quebec G1V 4G2, Canada
| | - Patrice E Poubelle
- Infectious Diseases and Immunity Research Division, Department of Medicine, Centre Hospitalier Universitaire de Québec-Université Laval Research Center, Quebec City, Quebec G1V 4G2, Canada
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11
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Fresneda Alarcon M, McLaren Z, Wright HL. Neutrophils in the Pathogenesis of Rheumatoid Arthritis and Systemic Lupus Erythematosus: Same Foe Different M.O. Front Immunol 2021; 12:649693. [PMID: 33746988 PMCID: PMC7969658 DOI: 10.3389/fimmu.2021.649693] [Citation(s) in RCA: 84] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/12/2021] [Indexed: 12/14/2022] Open
Abstract
Dysregulated neutrophil activation contributes to the pathogenesis of autoimmune diseases including rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). Neutrophil-derived reactive oxygen species (ROS) and granule proteases are implicated in damage to and destruction of host tissues in both conditions (cartilage in RA, vascular tissue in SLE) and also in the pathogenic post-translational modification of DNA and proteins. Neutrophil-derived cytokines and chemokines regulate both the innate and adaptive immune responses in RA and SLE, and neutrophil extracellular traps (NETs) expose nuclear neoepitopes (citrullinated proteins in RA, double-stranded DNA and nuclear proteins in SLE) to the immune system, initiating the production of auto-antibodies (ACPA in RA, anti-dsDNA and anti-acetylated/methylated histones in SLE). Neutrophil apoptosis is dysregulated in both conditions: in RA, delayed apoptosis within synovial joints contributes to chronic inflammation, immune cell recruitment and prolonged release of proteolytic enzymes, whereas in SLE enhanced apoptosis leads to increased apoptotic burden associated with development of anti-nuclear auto-antibodies. An unbalanced energy metabolism in SLE and RA neutrophils contributes to the pathology of both diseases; increased hypoxia and glycolysis in RA drives neutrophil activation and NET production, whereas decreased redox capacity increases ROS-mediated damage in SLE. Neutrophil low-density granulocytes (LDGs), present in high numbers in the blood of both RA and SLE patients, have opposing phenotypes contributing to clinical manifestations of each disease. In this review we will describe the complex and contrasting phenotype of neutrophils and LDGs in RA and SLE and discuss their discrete roles in the pathogenesis of each condition. We will also review our current understanding of transcriptomic and metabolomic regulation of neutrophil phenotype in RA and SLE and discuss opportunities for therapeutic targeting of neutrophil activation in inflammatory auto-immune disease.
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Affiliation(s)
- Michele Fresneda Alarcon
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Zoe McLaren
- Liverpool University Hospitals National Health Service (NHS) Foundation Trust, Liverpool, United Kingdom
| | - Helen Louise Wright
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
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12
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Brooks D, Barr LC, Wiscombe S, McAuley DF, Simpson AJ, Rostron AJ. Human lipopolysaccharide models provide mechanistic and therapeutic insights into systemic and pulmonary inflammation. Eur Respir J 2020; 56:13993003.01298-2019. [PMID: 32299854 DOI: 10.1183/13993003.01298-2019] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 03/18/2020] [Indexed: 02/07/2023]
Abstract
Inflammation is a key feature in the pathogenesis of sepsis and acute respiratory distress syndrome (ARDS). Sepsis and ARDS continue to be associated with high mortality. A key contributory factor is the rudimentary understanding of the early events in pulmonary and systemic inflammation in humans, which are difficult to study in clinical practice, as they precede the patient's presentation to medical services. Lipopolysaccharide (LPS), a constituent of the outer membrane of Gram-negative bacteria, is a trigger of inflammation and the dysregulated host response in sepsis. Human LPS models deliver a small quantity of LPS to healthy volunteers, triggering an inflammatory response and providing a window to study early inflammation in humans. This allows biological/mechanistic insights to be made and new therapeutic strategies to be tested in a controlled, reproducible environment from a defined point in time. We review the use of human LPS models, focussing on the underlying mechanistic insights that have been gained by studying the response to intravenous and pulmonary LPS challenge. We discuss variables that may influence the response to LPS before considering factors that should be considered when designing future human LPS studies.
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Affiliation(s)
- Daniel Brooks
- Institute of Cellular Medicine, Newcastle University, Newcastle Upon Tyne, UK
| | - Laura C Barr
- Dept of Respiratory Medicine, Royal Infirmary of Edinburgh, Edinburgh, UK
| | - Sarah Wiscombe
- Institute of Cellular Medicine, Newcastle University, Newcastle Upon Tyne, UK
| | - Daniel F McAuley
- School of Medicine, Dentistry and Biomedical Sciences, Institute for Health Sciences, Wellcome-Wolfson Institute for Experimental Medicine, Belfast, UK
| | - A John Simpson
- Institute of Cellular Medicine, Newcastle University, Newcastle Upon Tyne, UK
| | - Anthony J Rostron
- Institute of Cellular Medicine, Newcastle University, Newcastle Upon Tyne, UK
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13
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Rijkschroeff P, Schoenmaker T, Caspers M, Verschuren L, Keijser BJF, Nicu EA, Loos BG. Dentistry and OMICS: Transcriptome Dynamics of an Oral Ecosystem as Measured by Changes in Oral Polymorphonuclear Neutrophils in Experimental Gingivitis. OMICS-A JOURNAL OF INTEGRATIVE BIOLOGY 2020; 24:531-540. [PMID: 32559408 DOI: 10.1089/omi.2020.0034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Oral health and dentistry are essential components of systems medicine, which has received lesser attention in comparison to other medical fields, such as cancer biology. In this context, oral polymorphonuclear neutrophils (oPMNs) play an important role in the maintenance of oral health. To the best of our knowledge, this is the first study to report original observations on the transcriptional responses of oPMNs during experimentally induced gingivitis, by temporarily refraining from regular oral care. Oral rinses were prospectively collected at four different time points for oPMNs isolation from healthy volunteers: day 1 (start of the experimental gingivitis challenge), day 9 (during challenge), day 14 (end of the challenge), and day 21 (postchallenge). Transcriptome of oPMNs was determined by RNA sequencing. Differentially expressed genes (DEGs) were selected at p < 0.01 level, and evaluated for pathway regulation using Ingenuity Pathway Analysis suite. We found four major clusters of DEGs, consisting of 256 initial response DEGs (day 9 only), 221 late response DEGs (day 14 only), 53 persistent responsive DEGs (consistent at day 9 and 14), and 524 DEGs showing responses only in the postchallenge phase (day 21 only). Pathway analysis of the initial and late response DEGs showed involvement in many immune regulatory pathways and PMN function, whereas DEGs at day 21 were associated with epithelial adherence signaling and other miscellaneous related signaling pathways. The results from this pilot study showed that oPMNs mediate oral inflammatory processes, suggesting their immunomodulatory role in oral equilibrium.
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Affiliation(s)
- Patrick Rijkschroeff
- Department of Periodontology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam (UVA) and Vrije Universiteit Amsterdam (VU), Amsterdam, The Netherlands
| | - Ton Schoenmaker
- Department of Periodontology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam (UVA) and Vrije Universiteit Amsterdam (VU), Amsterdam, The Netherlands
| | - Martien Caspers
- Microbiology and System Biology, TNO Earth, Environmental and Life Sciences, Zeist, The Netherlands
| | - Lars Verschuren
- Microbiology and System Biology, TNO Earth, Environmental and Life Sciences, Zeist, The Netherlands
| | - Bart J F Keijser
- Microbiology and System Biology, TNO Earth, Environmental and Life Sciences, Zeist, The Netherlands.,Department of Preventive Dentistry, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Top Institute Food and Nutrition, Wageningen, The Netherlands
| | - Elena A Nicu
- Department of Periodontology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam (UVA) and Vrije Universiteit Amsterdam (VU), Amsterdam, The Netherlands.,Opris Dent SRL, Sibiu, Romania
| | - Bruno G Loos
- Department of Periodontology, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam (UVA) and Vrije Universiteit Amsterdam (VU), Amsterdam, The Netherlands
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14
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Tawfik DM, Lankelma JM, Vachot L, Cerrato E, Pachot A, Wiersinga WJ, Textoris J. Comparison of host immune responses to LPS in human using an immune profiling panel, in vivo endotoxemia versus ex vivo stimulation. Sci Rep 2020; 10:9918. [PMID: 32555232 PMCID: PMC7303162 DOI: 10.1038/s41598-020-66695-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 04/29/2020] [Indexed: 02/06/2023] Open
Abstract
Patients that suffer from sepsis exhibit an early hyper-inflammatory immune response which can lead to organ failure and death. In our study, we assessed the immune modulation in the human in vivo endotoxemia model and compared it to ex vivo LPS stimulation using 38 transcriptomic markers. Blood was collected before and after 4 hours of LPS challenge and tested with the Immune Profiling Panel (IPP) using the FilmArray system. The use of IPP showed that markers from the innate immunity dominated the response to LPS in vivo, mainly markers related to monocytes and neutrophils. Comparing the two models, in vivo and ex vivo, revealed that most of the markers were modulated in a similar pattern (68%). Some cytokine markers such as TNF, IFN-γ and IL-1β were under-expressed ex vivo compared to in vivo. T-cell markers were either unchanged or up-modulated ex vivo, compared to a down-modulation in vivo. Interestingly, markers related to neutrophils were expressed in opposite directions, which might be due to the presence of cell recruitment and feedback loops in vivo. The IPP tool was able to capture the early immune response in both the human in vivo endotoxemia model, a translational model mimicking the immune response observed in septic patients.
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Affiliation(s)
- Dina M Tawfik
- EA7426 "Pathophysiology of Injury-Induced Immunosuppression", PI3, Université Claude Bernard Lyon-1 Hospices Civils de Lyon - bioMérieux, Lyon, France
- Open Innovation and Partnerships (OIP), bioMérieux S.A, Lyon, France
| | - Jacqueline M Lankelma
- Center for Experimental and Molecular Medicine, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Laurence Vachot
- Open Innovation and Partnerships (OIP), bioMérieux S.A, Lyon, France
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Location Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, The Netherlands
| | - Elisabeth Cerrato
- Open Innovation and Partnerships (OIP), bioMérieux S.A, Lyon, France
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Location Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, The Netherlands
| | - Alexandre Pachot
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Location Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, The Netherlands
| | - W Joost Wiersinga
- Division of Infectious Diseases, Department of Medicine, Amsterdam UMC, location Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Anaesthesia and Critical Care Medicine Department, Hospices Civils de Lyon, Edouard Herriot Hospital, Lyon, France
| | - Julien Textoris
- Open Innovation and Partnerships (OIP), bioMérieux S.A, Lyon, France.
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Location Vrije Universiteit Amsterdam, Amsterdam UMC, Amsterdam, The Netherlands.
- Anaesthesia and Critical Care Medicine Department, Hospices Civils de Lyon, Edouard Herriot Hospital, Lyon, France.
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15
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Abstract
Neutrophils have traditionally been viewed as bystanders or biomarkers of cardiovascular disease. However, studies in the past decade have demonstrated the important functions of neutrophils during cardiovascular inflammation and repair. In this Review, we discuss the influence of traditional and novel cardiovascular risk factors on neutrophil production and function. We then appraise the current knowledge of the contribution of neutrophils to the different stages of atherosclerosis, including atherogenesis, plaque destabilization and plaque erosion. In the context of cardiovascular complications of atherosclerosis, we highlight the dichotomous role of neutrophils in pathogenic and repair processes in stroke, heart failure, myocardial infarction and neointima formation. Finally, we emphasize how detailed knowledge of neutrophil functions in cardiovascular homeostasis and disease can be used to generate therapeutic strategies to target neutrophil numbers, functional status and effector mechanisms.
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16
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Abstract
Structured models of ontogenic, phenotypic and functional diversity have been instrumental for a renewed understanding of the biology of immune cells, such as macrophages and lymphoid cells. However, there are no established models that can be used to define the diversity of neutrophils, the most abundant myeloid cells. This lack of an established model is largely due to the uniquely short lives of neutrophils, a consequence of their inability to divide once terminally differentiated, which has been perceived as a roadblock to functional diversity. This perception is rapidly evolving as multiple phenotypic and functional variants of neutrophils have been found, both in homeostatic and disease conditions. In this Opinion article, we present an overview of neutrophil heterogeneity and discuss possible mechanisms of diversification, including genomic regulation. We suggest that neutrophil heterogeneity is an important feature of immune pathophysiology, such that co-option of the mechanisms of diversification by cancer or other disorders contributes to disease progression.
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17
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Borowska D, Kuo R, Bailey RA, Watson KA, Kaiser P, Vervelde L, Stevens MP. Highly multiplexed quantitative PCR-based platform for evaluation of chicken immune responses. PLoS One 2019; 14:e0225658. [PMID: 31794562 PMCID: PMC6890255 DOI: 10.1371/journal.pone.0225658] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 11/08/2019] [Indexed: 11/22/2022] Open
Abstract
To address the need for sensitive high-throughput assays to analyse avian innate and adaptive immune responses, we developed and validated a highly multiplexed qPCR 96.96 Fluidigm Dynamic Array to analyse the transcription of chicken immune-related genes. This microfluidic system permits the simultaneous analysis of expression of 96 transcripts in 96 samples in 6 nanolitre reactions and the 9,216 reactions are ready for interpretation immediately. A panel of 89 genes was selected from an RNA-seq analysis of the transcriptional response of chicken macrophages, dendritic cells and heterophils to agonists of innate immunity and from published transcriptome data. Assays were confirmed to be highly specific by amplicon sequencing and melting curve analysis and the reverse transcription and preamplification steps were optimised. The array was applied to RNA of various tissues from a commercial line of broiler chickens housed at two different levels of biosecurity. Gut-associated lymphoid tissues, bursa, spleen and peripheral blood leukocytes were isolated and transcript levels for immune-related genes were defined. The results identified blood cells as a potentially reliable indicator of immune responses among all the tissues tested with the highest number of genes significantly differentially transcribed between birds housed under varying biosecurity levels. Conventional qPCR analysis of three differentially transcribed genes confirmed the results from the multiplex qPCR array. A highly multiplexed qPCR-based platform for evaluation of chicken immune responses has been optimised and validated using samples from commercial chickens. Apart from applications in selective breeding programmes, the array could be used to analyse the complex interplay between the avian immune system and pathogens by including pathogen-specific probes, to screen vaccine responses, and as a predictive tool for immune robustness.
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Affiliation(s)
- Dominika Borowska
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom
- * E-mail:
| | - Richard Kuo
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom
| | | | - Kellie A. Watson
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom
- Aviagen Ltd, Edinburgh, Scotland, United Kingdom
| | - Pete Kaiser
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom
| | - Lonneke Vervelde
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom
| | - Mark P. Stevens
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, Scotland, United Kingdom
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18
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Cao C, Yu M, Chai Y. Pathological alteration and therapeutic implications of sepsis-induced immune cell apoptosis. Cell Death Dis 2019; 10:782. [PMID: 31611560 PMCID: PMC6791888 DOI: 10.1038/s41419-019-2015-1] [Citation(s) in RCA: 157] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 08/28/2019] [Accepted: 09/02/2019] [Indexed: 02/07/2023]
Abstract
Sepsis is a life-threatening organ dysfunction syndrome caused by dysregulated host response to infection that leads to uncontrolled inflammatory response followed by immunosuppression. However, despite the high mortality rate, no specific treatment modality or drugs with high efficacy is available for sepsis to date. Although improved treatment strategies have increased the survival rate during the initial state of excessive inflammatory response, recent trends in sepsis show that mortality occurs at a period of continuous immunosuppressive state in which patients succumb to secondary infections within a few weeks or months due to post-sepsis “immune paralysis.” Immune cell alteration induced by uncontrolled apoptosis has been considered a major cause of significant immunosuppression. Particularly, apoptosis of lymphocytes, including innate immune cells and adaptive immune cells, is associated with a higher risk of secondary infections and poor outcomes. Multiple postmortem studies have confirmed that sepsis-induced immune cell apoptosis occurs in all age groups, including neonates, pediatric, and adult patients, and it is considered to be a primary contributing factor to the immunosuppressive pathophysiology of sepsis. Therapeutic perspectives targeting apoptosis through various strategies could improve survival in sepsis. In this review article, we will focus on describing the major apoptosis process of immune cells with respect to physiologic and molecular mechanisms. Further, advances in apoptosis-targeted treatment modalities for sepsis will also be discussed.
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Affiliation(s)
- Chao Cao
- Tianjin Medical University General Hospital, Tianjin, China.,Tianjin Medical University, Tianjin, China.,Department of Internal Medicine, The University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Muming Yu
- Tianjin Medical University General Hospital, Tianjin, China
| | - Yanfen Chai
- Tianjin Medical University General Hospital, Tianjin, China. .,Tianjin Medical University, Tianjin, China.
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19
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SenGupta S, Rane MJ, Uriarte SM, Woolley C, Mitchell TC. Human neutrophils depend on extrinsic factors produced by monocytes for their survival response to TLR4 stimulation. Innate Immun 2019; 25:473-486. [PMID: 31480890 PMCID: PMC6900669 DOI: 10.1177/1753425919871994] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
LPS delays neutrophil apoptosis by a process generally assumed to involve cell-intrinsic TLR4 signaling. However, neutrophil survival responses to LPS have been reported to be monocyte-dependent, which would indicate more complexity than is currently appreciated. We compared the survival responses of conventionally purified vs highly purified neutrophils to confirm or refute the need for secondary cell-types and to identify the cellular or molecular mechanisms involved. Direct stimulation of TLR4 failed to extend the survival of highly purified neutrophils, but survival activity was retained in less pure neutrophil preparations containing low numbers of eosinophils, monocytes, platelets and CD3+ lymphocytes. Sequential depletions identified monocytes as the only cell type required. Transfer of culture supernatants after lipid A-conditioning revealed that purified monocytes were sufficient for production of nearly all of the survival activity observed in mixed populations. The survival factors secreted upon TLR4 stimulation remain unidentified, but were not correlated with IL-1β, IL-6 or TNF-α nor could survival activity be inhibited by Ab blockade of IL-8 or of several other candidate factors other than endogenously produced GM-CSF, which was responsible for about one-tenth of the survival activity present in conditioned supernatants. These observations confirm that ex vivo neutrophil survival responses to TLR4 agonists are not cell intrinsic and involve potentially novel factors secreted by TLR4-stimulated monocytes.
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Affiliation(s)
- Shuvasree SenGupta
- Institute for Cellular Therapeutics and Department of Microbiology and Immunology, University of Louisville, Kentucky, USA.,Current address: Life Science Institute and Department of Pharmacology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Madhavi J Rane
- Department of Medicine, School of Medicine, University of Louisville, Kentucky, USA
| | - Silvia M Uriarte
- Department of Medicine, School of Medicine, University of Louisville, Kentucky, USA
| | - Cassandra Woolley
- Institute for Cellular Therapeutics and Department of Microbiology and Immunology, University of Louisville, Kentucky, USA
| | - Thomas C Mitchell
- Institute for Cellular Therapeutics and Department of Microbiology and Immunology, University of Louisville, Kentucky, USA
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20
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Coulibaly A, Velásquez SY, Sticht C, Figueiredo AS, Himmelhan BS, Schulte J, Sturm T, Centner FS, Schöttler JJ, Thiel M, Lindner HA. AKIRIN1: A Potential New Reference Gene in Human Natural Killer Cells and Granulocytes in Sepsis. Int J Mol Sci 2019; 20:ijms20092290. [PMID: 31075840 PMCID: PMC6539838 DOI: 10.3390/ijms20092290] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 04/27/2019] [Accepted: 05/07/2019] [Indexed: 12/11/2022] Open
Abstract
Timely and reliable distinction of sepsis from non-infectious systemic inflammatory response syndrome (SIRS) supports adequate antimicrobial therapy and saves lives but is clinically challenging. Blood transcriptional profiling promises to deliver insights into the pathomechanisms of SIRS and sepsis and to accelerate the discovery of urgently sought sepsis biomarkers. However, suitable reference genes for normalizing gene expression in these disease conditions are lacking. In addition, variability in blood leukocyte subtype composition complicates gene profile interpretation. Here, we aimed to identify potential reference genes in natural killer (NK) cells and granulocytes from patients with SIRS and sepsis on intensive care unit (ICU) admission. Discovery by a two-step probabilistic selection from microarray data followed by validation through branched DNA assays in independent patients revealed several candidate reference genes in NK cells including AKIRIN1, PPP6R3, TAX1BP1, and ADRBK1. Initially, no candidate genes could be validated in patient granulocytes. However, we determined highly similar AKIRIN1 expression also in SIRS and sepsis granulocytes and no change by in vitro LPS challenge in granulocytes from healthy donors. Inspection of external neutrophil transcriptome datasets further support unchanged AKIRIN1 expression in human systemic inflammation. As a potential new reference gene in NK cells and granulocytes in infectious and inflammatory diseases, AKIRIN1 may improve our pathomechanistic understanding of SIRS and sepsis and help identifying new sepsis biomarkers.
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Affiliation(s)
- Anna Coulibaly
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Sonia Y Velásquez
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Carsten Sticht
- Medical Research Center, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Ana Sofia Figueiredo
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Bianca S Himmelhan
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Jutta Schulte
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Timo Sturm
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Franz-Simon Centner
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Jochen J Schöttler
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Manfred Thiel
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
| | - Holger A Lindner
- Department of Anesthesiology and Surgical Intensive Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany.
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21
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Kegerreis BJ, Catalina MD, Geraci NS, Bachali P, Lipsky PE, Grammer AC. Genomic Identification of Low-Density Granulocytes and Analysis of Their Role in the Pathogenesis of Systemic Lupus Erythematosus. THE JOURNAL OF IMMUNOLOGY 2019; 202:3309-3317. [PMID: 31019061 DOI: 10.4049/jimmunol.1801512] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 03/20/2019] [Indexed: 12/30/2022]
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the presence of low-density granulocytes (LDGs) with a heightened capacity for spontaneous NETosis, but the contribution of LDGs to SLE pathogenesis remains unclear. To characterize LDGs in human SLE, gene expression profiles derived from isolated LDGs were characterized by weighted gene coexpression network analysis, and a 92-gene module was identified. The LDG gene signature was enriched in genes related to neutrophil degranulation and cell cycle regulation. This signature was assessed in gene expression datasets from two large-scale SLE clinical trials to study associations between LDG enrichment, SLE manifestations, and treatment regimens. LDG enrichment in the blood was associated with corticosteroid treatment as well as anti-dsDNA, low serum complement, renal manifestations, and vasculitis, but the latter two of these associations were dependent on concomitant corticosteroid treatment. In addition, LDG enrichment was associated with enrichment of gene signatures induced by type I IFN and TNF irrespective of corticosteroid treatment. Notably, LDG enrichment was not found in numerous tissues affected by SLE. Comparison with relevant reference datasets indicated that LDG enrichment is likely reflective of increased granulopoiesis in the bone marrow and not peripheral neutrophil activation. The results have uncovered important determinants of the appearance of LDGs in SLE and have emphasized the likely role of LDGs in specific aspects of lupus pathogenesis.
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Affiliation(s)
- Brian J Kegerreis
- RILITE Research Institute, Charlottesville, VA 22902; and AMPEL BioSolutions, Charlottesville, VA 22902
| | - Michelle D Catalina
- RILITE Research Institute, Charlottesville, VA 22902; and AMPEL BioSolutions, Charlottesville, VA 22902
| | - Nicholas S Geraci
- RILITE Research Institute, Charlottesville, VA 22902; and AMPEL BioSolutions, Charlottesville, VA 22902
| | - Prathyusha Bachali
- RILITE Research Institute, Charlottesville, VA 22902; and AMPEL BioSolutions, Charlottesville, VA 22902
| | - Peter E Lipsky
- RILITE Research Institute, Charlottesville, VA 22902; and AMPEL BioSolutions, Charlottesville, VA 22902
| | - Amrie C Grammer
- RILITE Research Institute, Charlottesville, VA 22902; and AMPEL BioSolutions, Charlottesville, VA 22902
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Differential Gene Expression Profile of Human Neutrophils Cultured with Plasmodium falciparum-Parasitized Erythrocytes. J Immunol Res 2018; 2018:6709424. [PMID: 30069491 PMCID: PMC6057315 DOI: 10.1155/2018/6709424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/08/2018] [Accepted: 05/15/2018] [Indexed: 11/17/2022] Open
Abstract
Neutrophils (PMNs) are the most abundant cellular component of our innate immune system, where they play central roles in the pathogenesis of and resistance to a broad range of diseases. However, their roles in malarial infection remain poorly understood. Therefore, we examined the transcriptional gene profile of human PMNs in response to Plasmodium falciparum-parasitized erythrocytes (iRBCs) by using oligonucleotide microarrays. Results revealed that PMNs induced a broad and vigorous set of changes in gene expression in response to malarial parasites, represented by 118 upregulated and 216 downregulated genes. The transcriptional response was characterized by the upregulation of numerous genes encoding multiple surface receptors, proteins involved in signal transduction pathways, and defense response proteins. This response included a number of genes which are known to be involved in the pathogenesis of malaria and other inflammatory diseases. Gene enrichment analysis suggested that the biological pathways involved in the PMN responses to the iRBCs included insulin receptor, Jak-STAT signaling pathway, mitogen-activated protein kinase (MAPK), and interleukin and interferon-gamma (IFN-γ) signaling pathways. The current study provides fundamental knowledge on the molecular responses of neutrophils to malarial parasites, which may aid in the discovery of novel therapeutic interventions.
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ter Haar NM, Tak T, Mokry M, Scholman RC, Meerding JM, de Jager W, Verwoerd A, Foell D, Vogl T, Roth J, Leliefeld PHC, van Loosdregt J, Koenderman L, Vastert SJ, de Roock S. Reversal of Sepsis-Like Features of Neutrophils by Interleukin-1 Blockade in Patients With Systemic-Onset Juvenile Idiopathic Arthritis. Arthritis Rheumatol 2018; 70:943-956. [DOI: 10.1002/art.40442] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 02/01/2018] [Indexed: 12/31/2022]
Affiliation(s)
- Nienke M. ter Haar
- University Medical Center Utrecht; Wilhelmina Children's Hospital and Utrecht University; Utrecht The Netherlands
| | - Tamar Tak
- University Medical Center Utrecht and Utrecht University; Utrecht The Netherlands
| | - Michal Mokry
- University Medical Center Utrecht; Wilhelmina Children's Hospital and Utrecht University; Utrecht The Netherlands
| | - Rianne C. Scholman
- University Medical Center Utrecht and Utrecht University; Utrecht The Netherlands
| | - Jenny M. Meerding
- University Medical Center Utrecht and Utrecht University; Utrecht The Netherlands
| | - Wilco de Jager
- University Medical Center Utrecht; Wilhelmina Children's Hospital and Utrecht University; Utrecht The Netherlands
| | - Anouk Verwoerd
- University Medical Center Utrecht and Utrecht University; Utrecht The Netherlands
| | - Dirk Foell
- University of Muenster; Muenster Germany
| | | | | | | | - Jorg van Loosdregt
- University Medical Center Utrecht; Wilhelmina Children's Hospital and Utrecht University; Utrecht The Netherlands
| | - Leo Koenderman
- University Medical Center Utrecht and Utrecht University; Utrecht The Netherlands
| | - Sebastiaan J. Vastert
- University Medical Center Utrecht; Wilhelmina Children's Hospital and Utrecht University; Utrecht The Netherlands
| | - Sytze de Roock
- University Medical Center Utrecht; Wilhelmina Children's Hospital and Utrecht University; Utrecht The Netherlands
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Human CD62Ldim neutrophils identified as a separate subset by proteome profiling and in vivo pulse-chase labeling. Blood 2017; 129:3476-3485. [DOI: 10.1182/blood-2016-07-727669] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 05/10/2017] [Indexed: 01/08/2023] Open
Abstract
Abstract
During acute inflammation, 3 neutrophil subsets are found in the blood: neutrophils with a conventional segmented nucleus, neutrophils with a banded nucleus, and T-cell–suppressing CD62Ldim neutrophils with a high number of nuclear lobes. In this study, we compared the in vivo kinetics and proteomes of banded, mature, and hypersegmented neutrophils to determine whether these cell types represent truly different neutrophil subsets or reflect changes induced by lipopolysaccharide (LPS) activation. Using in vivo pulse-chase labeling of neutrophil DNA with 6,6-2H2-glucose, we found that 2H-labeled banded neutrophils appeared much earlier in blood than labeled CD62Ldim and segmented neutrophils, which shared similar label kinetics. Comparison of the proteomes by cluster analysis revealed that CD62Ldim neutrophils were clearly separate from conventional segmented neutrophils despite having similar kinetics in peripheral blood. Interestingly, the conventional segmented cells were more related at a proteome level to banded cells despite a 2-day difference in maturation time. The differences between CD62Ldim and mature neutrophils are unlikely to have been a direct result of LPS-induced activation, because of the extremely low transcriptional capacity of CD62Ldim neutrophils and the fact that neutrophils do not directly respond to the low dose of LPS used in the study (2 ng/kg body weight). Therefore, we propose CD62Ldim neutrophils are a truly separate neutrophil subset that is recruited to the bloodstream in response to acute inflammation. This trial was registered at www.clinicaltrials.gov as #NCT01766414.
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Demaret J, Venet F, Plassais J, Cazalis MA, Vallin H, Friggeri A, Lepape A, Rimmelé T, Textoris J, Monneret G. Identification of CD177 as the most dysregulated parameter in a microarray study of purified neutrophils from septic shock patients. Immunol Lett 2016; 178:122-30. [DOI: 10.1016/j.imlet.2016.08.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 08/23/2016] [Accepted: 08/24/2016] [Indexed: 12/31/2022]
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Ackerman WE, Buhimschi IA, Eidem HR, Rinker DC, Rokas A, Rood K, Zhao G, Summerfield TL, Landon MB, Buhimschi CS. Comprehensive RNA profiling of villous trophoblast and decidua basalis in pregnancies complicated by preterm birth following intra-amniotic infection. Placenta 2016; 44:23-33. [PMID: 27452435 DOI: 10.1016/j.placenta.2016.05.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 04/11/2016] [Accepted: 05/23/2016] [Indexed: 12/20/2022]
Abstract
INTRODUCTION We performed RNA sequencing with the primary goal of discovering key placental villous trophoblast (VT) and decidua basalis (DB) transcripts differentially expressed in intra-amniotic infection (IAI)-induced preterm birth (PTB). METHODS RNA was extracted from 15 paired VT and DB specimens delivered of women with: 1) spontaneous PTB in the setting of amniocentesis-proven IAI and histological chorioamnionitis (n = 5); 2) spontaneous idiopathic PTB (iPTB, n = 5); and 3) physiologic term pregnancy (n = 5). RNA sequencing was performed using the Illumina HiSeq 2500 platform, and a spectrum of computational tools was used for gene prioritization and pathway analyses. RESULTS In the VT specimens, 128 unique long transcripts and 7 mature microRNAs differed significantly between pregnancies complicated by IAI relative to iPTB (FDR<0.1). The up-regulated transcripts included many characteristic of myeloblast-derived cells, and bioinformatic analyses revealed enrichment for multiple pathways associated with acute inflammation. In an expanded cohort including additional IAI and iPTB specimens, the expression of three proteins (cathepsin S, lysozyme, and hexokinase 3) and two microRNAs (miR-133a and miR-223) was validated using immunohistochemistry and quantitative PCR, respectively. In the DB specimens, only 11 long transcripts and no microRNAs differed significantly between IAI cases and iPTB controls (FDR<0.1). Comparison of the VT and DB specimens in each clinical scenario revealed signatures distinguishing these placental regions. DISCUSSION IAI is associated with a transcriptional signature consistent with acute inflammation in the villous trophoblast. The present findings illuminate novel signaling pathways involved in IAI, and suggest putative therapeutic targets and potential biomarkers associated with this condition.
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Affiliation(s)
- William E Ackerman
- Department of Obstetrics and Gynecology, The Ohio State College of Medicine, Columbus, OH, USA.
| | - Irina A Buhimschi
- Center for Perinatal Research, Nationwide Children's Hospital, Columbus, OH, USA.
| | - Haley R Eidem
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA.
| | - David C Rinker
- Program in Human Genetics, Vanderbilt University Medical Center, Nashville, TN, USA.
| | - Antonis Rokas
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA; Program in Human Genetics, Vanderbilt University Medical Center, Nashville, TN, USA.
| | - Kara Rood
- Department of Obstetrics and Gynecology, The Ohio State College of Medicine, Columbus, OH, USA.
| | - Guomao Zhao
- Center for Perinatal Research, Nationwide Children's Hospital, Columbus, OH, USA.
| | - Taryn L Summerfield
- Department of Obstetrics and Gynecology, The Ohio State College of Medicine, Columbus, OH, USA.
| | - Mark B Landon
- Department of Obstetrics and Gynecology, The Ohio State College of Medicine, Columbus, OH, USA.
| | - Catalin S Buhimschi
- Department of Obstetrics and Gynecology, The Ohio State College of Medicine, Columbus, OH, USA.
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Rimmelé T, Payen D, Cantaluppi V, Marshall J, Gomez H, Gomez A, Murray P, Kellum JA. IMMUNE CELL PHENOTYPE AND FUNCTION IN SEPSIS. Shock 2016; 45:282-91. [PMID: 26529661 PMCID: PMC4752878 DOI: 10.1097/shk.0000000000000495] [Citation(s) in RCA: 112] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Cells of the innate and adaptive immune systems play a critical role in the host response to sepsis. Moreover, their accessibility for sampling and their capacity to respond dynamically to an acute threat increases the possibility that leukocytes might serve as a measure of a systemic state of altered responsiveness in sepsis.The working group of the 14th Acute Dialysis Quality Initiative (ADQI) conference sought to obtain consensus on the characteristic functional and phenotypic changes in cells of the innate and adaptive immune system in the setting of sepsis. Techniques for the study of circulating leukocytes were also reviewed and the impact on cellular phenotypes and leukocyte function of nonextracorporeal treatments and extracorporeal blood purification therapies proposed for sepsis was analyzed.A large number of alterations in the expression of distinct neutrophil and monocyte surface markers have been reported in septic patients. The most consistent alteration seen in septic neutrophils is their activation of a survival program that resists apoptotic death. Reduced expression of HLA-DR is a characteristic finding on septic monocytes, but monocyte antimicrobial function does not appear to be significantly altered in sepsis. Regarding adaptive immunity, sepsis-induced apoptosis leads to lymphopenia in patients with septic shock and it involves all types of T cells (CD4, CD8, and Natural Killer) except T regulatory cells, thus favoring immunosuppression. Finally, numerous promising therapies targeting the host immune response to sepsis are under investigation. These potential treatments can have an effect on the number of immune cells, the proportion of cell subtypes, and the cell function.
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Affiliation(s)
- Thomas Rimmelé
- Anesthesiology and Critical Care Medicine, Edouard Herriot Hospital, Hospices Civils de Lyon, University Claude Bernard Lyon 1, Lyon, France
| | - Didier Payen
- Department of Anesthesiology & Critical Care and UMR INSERM 1160; Lariboisière Hospital, AP-HP and University Paris 7, Sorbonne Paris Cité, Paris, France
| | - Vincenzo Cantaluppi
- Nephrology, Dialysis and Kidney Transplantation Unit, Department of Medical Sciences, “Citta' della Salute e della Scienza di Torino- Molinette” University Hospital, Torino, Italy
| | - John Marshall
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Ontario Canada
| | - Hernando Gomez
- Center for Critical Care Nephrology; The CRISMA (Clinical Research, Investigation, and Systems Modeling of Acute Illness) Center, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Alonso Gomez
- Academia Colombiana de Medicina Critica (ACOMEC)
- Division of Critical Care Medicine, Clínica Palermo, Bogotá, Colombia
| | | | - John A. Kellum
- Center for Critical Care Nephrology; The CRISMA (Clinical Research, Investigation, and Systems Modeling of Acute Illness) Center, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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Blankley S, Graham CM, Howes A, Bloom CI, Berry MPR, Chaussabel D, Pascual V, Banchereau J, Lipman M, O’Garra A. Identification of the key differential transcriptional responses of human whole blood following TLR2 or TLR4 ligation in-vitro. PLoS One 2014; 9:e97702. [PMID: 24842522 PMCID: PMC4026482 DOI: 10.1371/journal.pone.0097702] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 04/23/2014] [Indexed: 01/01/2023] Open
Abstract
The use of human whole blood for transcriptomic analysis has potential advantages over the use of isolated immune cells for studying the transcriptional response to pathogens and their products. Whole blood stimulation can be carried out in a laboratory without the expertise or equipment to isolate immune cells from blood, with the added advantage of being able to undertake experiments using very small volumes of blood. Toll like receptors (TLRs) are a family of pattern recognition receptors which recognise highly conserved microbial products. Using the TLR2 ligand (Pam3CSK4) and the TLR4 ligand (LPS), human whole blood was stimulated for 0, 1, 3, 6, 12 or 24 hours at which times mRNA was isolated and a comparative microarray was undertaken. A common NFκB transcriptional programme was identified following both TLR2 and TLR4 ligation which peaked at between 3 to 6 hours including upregulation of many of the NFκB family members. In contrast an interferon transcriptional response was observed following TLR4 but not TLR2 ligation as early as 1 hour post stimulation and peaking at 6 hours. These results recapitulate the findings observed in previously published studies using isolated murine and human myeloid cells indicating that in vitro stimulated human whole blood can be used to interrogate the early transcriptional kinetic response of innate cells to TLR ligands. Our study demonstrates that a transcriptomic analysis of mRNA isolated from human whole blood can delineate both the temporal response and the key transcriptional differences following TLR2 and TLR4 ligation.
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Affiliation(s)
- Simon Blankley
- Division of Immunoregulation, MRC National Institute for Medical Research, London, United Kingdom
- * E-mail:
| | - Christine M. Graham
- Division of Immunoregulation, MRC National Institute for Medical Research, London, United Kingdom
| | - Ashleigh Howes
- Division of Immunoregulation, MRC National Institute for Medical Research, London, United Kingdom
| | - Chloe I. Bloom
- Division of Immunoregulation, MRC National Institute for Medical Research, London, United Kingdom
| | - Matthew P. R. Berry
- Division of Immunoregulation, MRC National Institute for Medical Research, London, United Kingdom
- Department of Respiratory Medicine, Imperial College Healthcare NHS trust, London, United Kingdom
| | - Damien Chaussabel
- Baylor Institute for Immunology Research/ANRS Center for Human Vaccines, INSERM, Dallas, Texas, United States of America
- Systems Immunology, Benaroya Research Institute, Seattle, Washington, United States of America
| | - Virginia Pascual
- Baylor Institute for Immunology Research/ANRS Center for Human Vaccines, INSERM, Dallas, Texas, United States of America
| | - Jacques Banchereau
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut, United States of America
| | - Marc Lipman
- Department of Respiratory Medicine, Royal Free London NHS Foundation Trust, University College London, London, United Kingdom
| | - Anne O’Garra
- Division of Immunoregulation, MRC National Institute for Medical Research, London, United Kingdom
- Department of Medicine, National Heart and Lung Institute, Imperial College, London, United Kingdom
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De Vries F, Leuschner J, Jilma B, Derhaschnig U. Establishment of a low dose canine endotoxemia model to test anti-inflammatory drugs: effects of prednisolone. Int J Immunopathol Pharmacol 2014; 26:861-9. [PMID: 24355221 DOI: 10.1177/039463201302600404] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Infusion of low doses of lipopolysaccharide (LPS) in human volunteers provides a standardised model to study novel anti-inflammatory drugs. However, low dose endotoxemia is not well characterised in animals larger than rodents and trials with immunomodulating substances are scarce. We conducted a dose-finding study to establish a canine endotoxemia model combining optimal cytokine response with minimal burden for the animals. We thereafter evaluated the pharmacodynamics and pharmacokinetics (PK) of prednisolone. For dose-finding, dogs randomly received a single bolus of 0.03, 0.1 or 1.0 microg/kg BW LPS i.v. The second part was a randomised, placebo controlled trial with 4 parallel groups. Either 0.25, 0.5 or 5mg/kgBW prednisolone or placebo were given for 3 days. On day 3, all animals received 0.1microg/kg BW LPS i.v. Blood was sampled to measure interleukin 6 (IL-6) and tumor necrosis factor-alpha, C-reactive protein, prednisolone and cortisol concentrations. In accordance with human endotoxemia, LPS substantially and dose-dependently increased IL-6 and TNF-alpha several 1000-fold. Prednisolone significantly attenuated the LPS-induced IL-6 and TNF-alpha responses by a maximum of 96 percent (p less than 0.03 for all treatment groups) and significantly reduced peak cortisol concentrations in a dose-dependent way (p less than 0.004 for all treatment groups). PK showed a non-linear kinetic. In conclusion, this dog model could provide a reliable setting to test experimental drugs for canine or human use.
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Affiliation(s)
- F De Vries
- Boehringer Ingelheim Vetmedica GmbH, Ingelheim, Germany
| | - J Leuschner
- LPT Laboratory of Pharmacology and Toxicology GmbH and CoKG, Hamburg, Germany
| | - B Jilma
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
| | - U Derhaschnig
- Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
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Khaenam P, Rinchai D, Altman MC, Chiche L, Buddhisa S, Kewcharoenwong C, Suwannasaen D, Mason M, Whalen E, Presnell S, Susaengrat W, O'Brien K, Nguyen QA, Gersuk V, Linsley PS, Lertmemongkolchai G, Chaussabel D. A transcriptomic reporter assay employing neutrophils to measure immunogenic activity of septic patients' plasma. J Transl Med 2014; 12:65. [PMID: 24612859 PMCID: PMC4007645 DOI: 10.1186/1479-5876-12-65] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 03/04/2014] [Indexed: 02/07/2023] Open
Abstract
Background There are diverse molecules present in blood plasma that regulate immune functions and also present a potential source of disease biomarkers and therapeutic targets. Genome-wide profiling has become a powerful method for assessing immune responses on a systems scale, but technologies that can measure the plasma proteome still face considerable challenges. An alternative approach to direct proteome assessment is to measure transcriptome responses in reporter cells exposed in vitro to plasma. In this report we describe such a “transcriptomic reporter assay” to assess plasma from patients with sepsis, which is a common and severe systemic infectious process for which physicians lack efficient diagnostic or prognostic markers. Methods Plasma samples collected from patients with culture-confirmed bacterial sepsis and uninfected healthy controls were used to stimulate three separate cell types – neutrophils, peripheral blood mononuclear cells, and monocyte-derived dendritic cells. Whole genome microarrays were generated from stimulated cells to assess transcriptional responses. Unsupervised analysis and enriched functional networks were evaluated for each cell type. Principal component analyses were used to assess variability in responses. A random K-nearest neighbor – feature selection algorithm was used to identify markers predictive of sepsis severity, which were then validated in an independent data set. Results Neutrophils demonstrated the most distinct response to plasma from septic patients with 709 genes showing altered expression profiles, many of which are involved in established immunologic pathways. The amplitude of the neutrophil transcriptomic response was shown to be correlated with sepsis severity in two independent sets of patients comprised of 64 total septic patients. A subset of 30 transcripts selected using one set of patients was demonstrated to have a high degree of accuracy (82-90%) in predicting sepsis severity and outcomes in the other independent set. This subset included several genes previously established in sepsis pathogenesis as well as novel genes. Conclusions These results demonstrate both the suitability and potential clinical relevance of a neutrophil reporter assay for studying plasma, in this case from septic patients. The distinctive transcriptional signature we found could potentially help predict severity of disease and guide treatment. Our findings also shed new light on mechanisms of immune dysregulation in sepsis.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Ganjana Lertmemongkolchai
- Systems Immunology Division, Benaroya Research Institute, 1201 Ninth Avenue, Seattle, WA 98101, USA.
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Kamisoglu K, Sleight K, Nguyen TT, Calvano SE, Coyle SM, Corbett SA, Androulakis IP. Effects of coupled dose and rhythm manipulation of plasma cortisol levels on leukocyte transcriptional response to endotoxin challenge in humans. Innate Immun 2013; 20:774-84. [PMID: 24217219 DOI: 10.1177/1753425913508458] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Severe traumas are associated with hypercortisolemia due to both disruption of cortisol secretion rhythm and increase in its total concentration. Understanding the effects of altered cortisol levels and rhythms on immune function is of great clinical interest, to prevent conditions such as sepsis from complicating the recovery. This in vivo study assesses the responses of circulating leukocytes to coupled dose and rhythm manipulation of cortisol, preceding an immune challenge induced by endotoxin administration. Through continuous infusion, plasma cortisol concentration was increased to and kept constant at a level associated with major physiologic stress. In response, transcriptional programming of leukocytes was altered to display a priming response before endotoxin exposure. Enhanced expression of a number of receptors and signaling proteins, as well as lowered protein translation and mitochondrial function indicated a sensitization against potential infectious threats. Despite these changes, response to endotoxin followed very similar patterns in both cortisol and saline pre-treated groups except one cluster including probe sets associated with major players regulating inflammatory response. In sum, altered dose and rhythm of plasma cortisol levels engendered priming of circulating leukocytes when preceded an immune challenge. This transcriptional program change associated with stimulated surveillance function and suppressed energy-intensive processes, emphasized permissive actions of cortisol on immune function.
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Affiliation(s)
- Kubra Kamisoglu
- Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - Kirsten Sleight
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - Tung T Nguyen
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - Steve E Calvano
- Department of Surgery, Rutgers, Robert Wood Johnson Medical School, Clinical Academic Building, New Brunswick, NJ, USA
| | - Susette M Coyle
- Department of Surgery, Rutgers, Robert Wood Johnson Medical School, Clinical Academic Building, New Brunswick, NJ, USA
| | - Siobhan A Corbett
- Department of Surgery, Rutgers, Robert Wood Johnson Medical School, Clinical Academic Building, New Brunswick, NJ, USA
| | - Ioannis P Androulakis
- Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA Department of Surgery, Rutgers, Robert Wood Johnson Medical School, Clinical Academic Building, New Brunswick, NJ, USA
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Lewis SM, Khan N, Beale R, Treacher DF, Brown KA. Depletion of blood neutrophils from patients with sepsis: treatment for the future? Int Immunopharmacol 2013; 17:1226-32. [PMID: 24144812 DOI: 10.1016/j.intimp.2013.10.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Organ failure arising from severe sepsis accounts for nearly 6 million deaths worldwide per annum. At present there are no specific pharmacological agents available for its treatment and identifying a suitable therapeutic target is urgently needed. Neutrophils appear to be contributing directly to pulmonary damage in severe forms of lung injury and indirectly to the failure of other organs. Blood neutrophils from patients with sepsis possess a phenotype that is indicative of activation and our results show that neutrophils isolated from patients with sepsis exhibit a supranormal adherence to endothelial monolayers treated with pro-inflammatory cytokines. Additional studies reveal that the patients' cells are highly efficient at releasing IL-8. We also demonstrate that organ function is improved upon removing neutrophils from the circulation. In this article we propose that in severe sepsis there is a subpopulation of neutrophils which is actively engaged in pathological insult. The phenotypic characterisation of this subset may provide a novel therapeutic strategy for sepsis that could lead to patient benefit.
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Affiliation(s)
- Sion M Lewis
- Intensive Care Unit, Guy's and St. Thomas' NHS Foundation Trust, London, UK; Vascular Immunology, King's College London, UK
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Fullerton JN, O'Brien AJ, Gilroy DW. Pathways mediating resolution of inflammation: when enough is too much. J Pathol 2013; 231:8-20. [PMID: 23794437 DOI: 10.1002/path.4232] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 06/11/2013] [Accepted: 06/17/2013] [Indexed: 01/22/2023]
Abstract
Patients with critical illness, and in particular sepsis, are now recognized to undergo unifying, pathogenic disturbances of immune function. Whilst scientific and therapeutic focus has traditionally been on understanding and modulating the initial pro-inflammatory limb, recent years have witnessed a refocusing on the development and importance of immunosuppressive 'anti-inflammatory' pathways. Several mechanisms are known to drive this phenomenon; however, no overriding conceptual framework justifies them. In this article we review the contribution of pro-resolution pathways to this phenotype, describing the observed immune alterations in terms of either a failure of resolution of inflammation or the persistence of pro-resolution processes causing inappropriate 'injurious resolution'-a novel hypothesis. The dysregulation of key processes in critical illness, including apoptosis of infiltrating neutrophils and their efferocytosis by macrophages, are discussed, along with the emerging role of specialized cell subtypes Gr1(+) CD11b(+) myeloid-derived suppressor cells and CD4(+) CD25(+) FoxP3(+) T-regulatory cells.
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Affiliation(s)
- James N Fullerton
- Centre for Clinical Pharmacology, Division of Medicine, University College London, London, UK.
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35
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de Kleijn S, Langereis JD, Leentjens J, Kox M, Netea MG, Koenderman L, Ferwerda G, Pickkers P, Hermans PWM. IFN-γ-stimulated neutrophils suppress lymphocyte proliferation through expression of PD-L1. PLoS One 2013; 8:e72249. [PMID: 24015224 PMCID: PMC3756078 DOI: 10.1371/journal.pone.0072249] [Citation(s) in RCA: 144] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Accepted: 07/14/2013] [Indexed: 12/15/2022] Open
Abstract
During systemic inflammation different neutrophil subsets are mobilized to the peripheral blood. These neutrophil subsets can be distinguished from normal circulating neutrophils (CD16bright/CD62Lbright), based on either an immature CD16dim/CD62Lbright or a CD16bright/CD62Ldim phenotype. Interestingly, the latter neutrophil subset is known to suppress lymphocyte proliferation ex vivo, but how neutrophils become suppressive is unknown. We performed transcriptome analysis on the different neutrophil subsets to identify changes in mRNA expression that are relevant for their functions. Neutrophil subsets were isolated by fluorescence-activated cell sorting from blood of healthy volunteers that were administered a single dose of lipopolysaccharide (2 ng/kg i.v.) and the transcriptome was determined by microarray analysis. Interestingly, the CD16bright/CD62Ldim suppressive neutrophils showed an interferon-induced transcriptome profile. More importantly, IFN-γ, but not IFN-α or IFN-β stimulated neutrophils, acquired the capacity to suppress lymphocyte proliferation through the expression of programmed death ligand 1 (PD-L1). These data demonstrate that IFN-γ-induced expression of PD-L1 on neutrophils enables suppression of lymphocyte proliferation. Specific stimulation of neutrophils present at the inflammatory sites might therefore have a pivotal role in regulating lymphocyte-mediated inflammation and autoimmune disease.
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Affiliation(s)
- Stan de Kleijn
- Laboratory of Pediatric Infectious Diseases, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Jeroen D. Langereis
- Laboratory of Pediatric Infectious Diseases, Radboud University Medical Centre, Nijmegen, The Netherlands
- * E-mail:
| | - Jenneke Leentjens
- Department of Intensive Care Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Matthijs Kox
- Department of Intensive Care Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
- Department of Anesthesiology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Mihai G. Netea
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Leo Koenderman
- Department of Respiratory Medicine, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Gerben Ferwerda
- Laboratory of Pediatric Infectious Diseases, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Peter Pickkers
- Department of Intensive Care Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Peter W. M. Hermans
- Laboratory of Pediatric Infectious Diseases, Radboud University Medical Centre, Nijmegen, The Netherlands
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36
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Tintinger GR, Anderson R, Feldman C. Pharmacological approaches to regulate neutrophil activity. Semin Immunopathol 2013; 35:395-409. [PMID: 23494251 DOI: 10.1007/s00281-013-0366-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Accepted: 02/07/2013] [Indexed: 12/14/2022]
Abstract
Although indispensable in host defense against microbial pathogens, misdirected hyperacute and chronic activation of neutrophils presents the potential hazard of tissue damage, organ dysfunction, and carcinogenesis. In many clinical settings, particularly inflammatory disorders of the airways, over-reactivity of neutrophils is exacerbated by their relative resistance to conventional, pharmacological anti-inflammatory therapies, including, but not limited to, corticosteroids. Notwithstanding their sheer numbers, which can increase rapidly and dramatically during inflammatory responses, these cells are not only pre-programmed to release reactive oxygen species, proteinases, and eicosanoids/prostanoids immediately on exposure to pro-inflammatory stimuli but may also subsequently undergo the process of netosis, thereby enhancing and protracting their inflammatory potential. All of these mechanisms are likely to underpin the resistance of neutrophils to pharmacological control and have triggered the search for alternatives to corticosteroids. In addition to macrolides and adenosine 3',5'-cyclic adenosine monophospate-elevating agents, more recent innovations in the control of neutrophilic inflammation include activators of histone deacetylases and antagonists of chemokine receptors, as well as monoclonal antibodies which target neutrophil-activating cytokines and their receptors. These and other neutrophil-targeted strategies represent the focus of the current review.
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Affiliation(s)
- G R Tintinger
- Medical Research Council Unit for Inflammation and Immunity, Department of Immunology, Faculty of Health Sciences, University of Pretoria, Pretoria 0001, South Africa.
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37
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McLeish KR, Merchant ML, Klein JB, Ward RA. Technical note: proteomic approaches to fundamental questions about neutrophil biology. J Leukoc Biol 2013; 94:683-92. [PMID: 23470899 DOI: 10.1189/jlb.1112591] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Proteomics is one of a group of technologies that generates high-throughput, large-scale datasets that can be used to understand cell or organ functions at a systems level. This review will focus on the application of proteomics to the understanding of neutrophil biology. The strengths and weaknesses of common proteomic methods and their application to neutrophils are reviewed, with the goal of evaluating whether the technology is ready to advance our understanding of neutrophil biology.
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Affiliation(s)
- Kenneth R McLeish
- 1.Baxter I Research Bldg., Rm. 102 South, 570 South Preston St., Louisville, KY 40202, USA.
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38
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RNA-seq reveals activation of both common and cytokine-specific pathways following neutrophil priming. PLoS One 2013; 8:e58598. [PMID: 23554905 PMCID: PMC3590155 DOI: 10.1371/journal.pone.0058598] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Accepted: 02/05/2013] [Indexed: 11/22/2022] Open
Abstract
Neutrophils are central to the pathology of inflammatory diseases, where they can damage host tissue through release of reactive oxygen metabolites and proteases, and drive inflammation via secretion of cytokines and chemokines. Many cytokines, such as those generated during inflammation, can induce a similar “primed” phenotype in neutrophils, but it is unknown if different cytokines utilise common or cytokine-specific pathways to induce these functional changes. Here, we describe the transcriptomic changes induced in control human neutrophils during priming in vitro with pro-inflammatory cytokines (TNF-α and GM-CSF) using RNA-seq. Priming led to the rapid expression of a common set of transcripts for cytokines, chemokines and cell surface receptors (CXCL1, CXCL2, IL1A, IL1B, IL1RA, ICAM1). However, 580 genes were differentially regulated by TNF-α and GM-CSF treatment, and of these 58 were directly implicated in the control of apoptosis. While these two cytokines both delayed apoptosis, they induced changes in expression of different pro- and anti-apoptotic genes. Bioinformatics analysis predicted that these genes were regulated via differential activation of transcription factors by TNF-α and GM-CSF and these predictions were confirmed using functional assays: inhibition of NF-κB signalling abrogated the protective effect of TNF-α (but not that of GM-CSF) on neutrophil apoptosis, whereas inhibition of JAK/STAT signalling abrogated the anti-apoptotic effect of GM-CSF, but not that of TNF-α (p<0.05). These data provide the first characterisation of the human neutrophil transcriptome following GM-CSF and TNF-α priming, and demonstrate the utility of this approach to define functional changes in neutrophils following cytokine exposure. This may provide an important, new approach to define the molecular properties of neutrophils after in vivo activation during inflammation.
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