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Abstract
Pro-inflammatory caspase-1 is a key player in innate immunity. Following activation in heterogenic protein complexes called the inflammasome , caspase-1 processes IL-1β and IL-18 to their mature forms and triggers pyroptosis. Here, we describe a small-volume whole blood assay facilitating the measurement of caspase-1 activity and inflammasome-related gene expression following specific stimulation of either the NLRP3, NLRC4, or AIM2 inflammasome .
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Affiliation(s)
- Lev Grinstein
- Department of Pediatrics, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan Winkler
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
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Chanyalew M, Abebe M, Endale B, Girma S, Tasew G, Bobosha K, Zewide M, Howe R, van Zandbergen G, Ritter U, Gadisa E, Aseffa A, Laskay T. Enhanced activation of blood neutrophils and monocytes in patients with Ethiopian localized cutaneous leishmaniasis in response to Leishmania aethiopica Neutrophil activation in Ethiopian cutaneous leishmaniasis. Acta Trop 2021; 220:105967. [PMID: 34029532 DOI: 10.1016/j.actatropica.2021.105967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 05/04/2021] [Accepted: 05/16/2021] [Indexed: 11/15/2022]
Abstract
Recent studies suggest an essential role of the innate immune effector cells neutrophils and monocytes in protection or disease progression in the early course of Leishmania infection. In areas endemic for cutaneous leishmaniasis in Ethiopia most individuals are exposed to bites of infected sandflies. Still only a minor ratio of the inhabitants develops symptomatic disease. Neutrophils, followed by monocytes, are the first cells to be recruited to the site of Leishmania infection, the initial response of neutrophils to parasites appears to be crucial for the protective response and disease outcome. Our working hypothesis is that neutrophils and/or monocytes in localized cutaneous leishmaniasis (LCL) patients may have defects in function of innate immune cell that contribute to failure to parasite clearance that lead to establishment of infection. The response of cells in Ethiopian LCL patients and healthy controls to Leishmania aethiopica and to the Toll like receptor (TLR) agonists lipopolysaccharide (LPS) and macrophage activating lipopeptide-2 (MALP-2) was investigated by assessing the cell surface expression of CD62L (on neutrophil and monocyte) and CD66b (only on neutrophil), as well as reactive oxygen species (ROS) production by using whole blood-based assays in vitro. No impaired response of neutrophils and monocytes to the microbial constituents LPS and MALP-2 was observed. Neutrophils and monocytes from LCL patients responded stronger to Leishmania aethiopica in the applied whole blood assays than cells from healthy individuals. These experimental findings do not support the hypothesis regarding a possible dysfunction of neutrophils and monocytes in cutaneous leishmaniasis. On the contrary, these cells react stronger in LCL patients as compared to healthy controls. The differential response to L. aethiopica observed between LCL patients and healthy controls have the potential to serve as biomarker to develop FACS based diagnostic/ prognostic techniques for LCL.
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Affiliation(s)
- Menberework Chanyalew
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia.
| | - Markos Abebe
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Birtukan Endale
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Selfu Girma
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Geremew Tasew
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia; Leishmaniasis Research Laboratory, Ethiopian Public Health Institute, P.O. Box 1242, Addis Ababa, Ethiopia
| | - Kidist Bobosha
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Martha Zewide
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia.
| | - Rawleigh Howe
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Ger van Zandbergen
- Division of Immunology, Paul-Ehrlich-Institute, Federal Institute for Vaccines and Biomedicines, Langen D-63225, Germany.
| | - Uwe Ritter
- Regensburg Center for Interventional Immunology (RCI), Institute of Immunology, University Medical Center Regensburg, University of Regensburg, Regensburg D-93053, Germany.
| | - Endalamaw Gadisa
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Abraham Aseffa
- Research and Innovation Division, Armauer Hansen Research Institute, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Tamás Laskay
- Department of Infectious Diseases and Microbiology, University of Lübeck, Lübeck D-23560, Germany.
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Khatun M, Damgaard BM, Andersen JB, Røntved CM. Effect of polymyxin B on ex vivo tumor necrosis factor-alpha responsiveness of blood leukocytes in Danish Holstein Friesian cows. Vet Immunol Immunopathol 2021; 238:110293. [PMID: 34284224 DOI: 10.1016/j.vetimm.2021.110293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/14/2021] [Accepted: 07/14/2021] [Indexed: 10/20/2022]
Abstract
Whole blood stimulation assay (WBA) with killed gram-positive and gram-negative udder pathogens were used to investigate the interference of the endotoxin-binding antibiotic polymyxin B (PMB) on the ex vivo TNF-α response. Blood samples were collected from first to third lactating dairy cows in their early lactation (<50 days in milk, n = 32) period. The WBA was stimulated with both inactivated bacteria (e.g., dead Escherichia coli, Staphylococcus aureus, Streptococcus dysgalactiae, Streptococcus uberis), at a concentration of 2.5 × 106/mL; and pathogen-associated molecular pattern molecules, namely E. coli LPS (10 μg/mL), and S. aureus peptidoglycan (PG, 10 μg/mL). The PMB was added at a concentration of 0, 12.5, 25, 50, 100, and 200 μg/mL to each stimulant, respectively. All bacteria stimulants resulted in an increased TNF-α response compared to the negative control. The PMB affected the TNF-α responses of gram-positive (except S. dysgalactaie), gram-negative bacteria; and bacterial cell wall components at a PMB concentration of 25-50 μg/mL. The LPS and E. coli had similar TNF-α response but PG had a lower TNF-α response than gram-positive bacteria. The doses of PMB (≥ 25 μg/mL) should be used with caution when using different types of pathogens or should be avoided in ex vivo TNF-α studies.
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Affiliation(s)
- Momena Khatun
- Aarhus University, Faculty of Science and Technology, Department of Animal Science, Blichers Allé 20, P.O. Box 50, DK-8300, Tjele, Denmark.
| | - Birthe M Damgaard
- Aarhus University, Faculty of Science and Technology, Department of Animal Science, Blichers Allé 20, P.O. Box 50, DK-8300, Tjele, Denmark.
| | - Jens B Andersen
- Aarhus University, Faculty of Science and Technology, Department of Animal Science, Blichers Allé 20, P.O. Box 50, DK-8300, Tjele, Denmark.
| | - Christine M Røntved
- Aarhus University, Faculty of Science and Technology, Department of Animal Science, Blichers Allé 20, P.O. Box 50, DK-8300, Tjele, Denmark; Christine Røntved, CMR On-Site RD, Graverhusvej 53, Langholt, 9310, Vodskov, Denmark.
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Petrone L, Petruccioli E, Vanini V, Cuzzi G, Gualano G, Vittozzi P, Nicastri E, Maffongelli G, Grifoni A, Sette A, Ippolito G, Migliori GB, Palmieri F, Goletti D. Coinfection of tuberculosis and COVID-19 limits the ability to in vitro respond to SARS-CoV-2. Int J Infect Dis 2021:S1201-9712(21)00176-4. [PMID: 33713816 DOI: 10.1016/j.ijid.2021.02.090] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 02/23/2021] [Accepted: 02/23/2021] [Indexed: 12/11/2022] Open
Abstract
Objectives The interaction of COVID-19 and tuberculosis (TB) are still poor characterized. Here we evaluated the immune response specific for Micobacterium tuberculosis (Mtb) and SARS-CoV-2 using a whole-blood-based assay-platform in COVID-19 patients either with TB or latent TB infection (LTBI). Methods We evaluated IFN-γ level in plasma from whole-blood stimulated with Mtb antigens in the Quantiferon-Plus format or with peptides derived from SARS-CoV-2 spike protein, Wuhan-Hu-1 isolate (CD4-S). Results We consecutively enrolled 63 COVID-19, 10 TB-COVID-19 and 11 LTBI-COVID-19 patients. IFN-γ response to Mtb-antigens was significantly associated to TB status and therefore it was higher in TB-COVID-19 and LTBI-COVID-19 patients compared to COVID-19 patients (p ≤ 0.0007). Positive responses against CD4-S were found in 35/63 COVID-19 patients, 7/11 LTBI-COVID-19 and only 2/10 TB-COVID-19 patients. Interestingly, the responders in the TB-COVID-19 group were less compared to COVID-19 and LTBI-COVID-19 groups (p = 0.037 and 0.044, respectively). Moreover, TB-COVID-19 patients showed the lowest quantitative IFN-γ response to CD4-S compared to COVID-19-patients (p = 0.0336) and LTBI-COVID-19 patients (p = 0.0178). Conclusions Our data demonstrate that COVID-19 patients either TB or LTBI have a low ability to build an immune response to SARS-CoV-2 while retaining the ability to respond to Mtb-specific antigens.
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Haque AKMA, Weinmann P, Biswas S, Handgretinger R, Mezger M, Kormann MSD, Antony JS. RNA ImmunoGenic Assay: A Method to Detect Immunogenicity of in vitro Transcribed mRNA in Human Whole Blood. Bio Protoc 2020; 10:e3850. [PMID: 33855105 PMCID: PMC8032499 DOI: 10.21769/bioprotoc.3850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/24/2020] [Accepted: 09/28/2020] [Indexed: 11/02/2022] Open
Abstract
The mRNA therapeutics is a new class of medicine to treat many various diseases. However, in vitro transcribed (IVT) mRNA triggers immune responses due to recognition by human endosomal and cytoplasmic RNA sensors, but incorporation of modified nucleosides have been shown to reduce such responses. Therefore, an assay signifying important aspects of the human immune system is still required. Here, we present a simple ex vivo method called 'RNA ImmunoGenic Assay' to measure immunogenicity of IVT-mRNAs in human whole blood. Chemically modified and unmodified mRNA are complexed with a transfection reagent (TransIT), and co-incubated in human whole blood. Specific cytokines are measured (TNF-α, INF-α, INF-γ, IL-6 and IL-12p70) using ELISAs. The qPCR analysis is performed to reveal the activation of specific immune pathways. The RNA ImmunoGenic Assay provides a simple and fast method to detect donor specific - immune response against mRNA therapeutics. Graphic abstract: Schematic representation of RNA ImmunoGenic Assay.
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Affiliation(s)
- AKM Ashiqul Haque
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Petra Weinmann
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Sumit Biswas
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Rupert Handgretinger
- University Children's Clinic Department of Paediatrics I, Hematology and Oncology, University of Tuebingen, Germany
| | - Markus Mezger
- University Children's Clinic Department of Paediatrics I, Hematology and Oncology, University of Tuebingen, Germany
| | - Michael S. D. Kormann
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Justin S Antony
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
- University Children's Clinic Department of Paediatrics I, Hematology and Oncology, University of Tuebingen, Germany
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Tasew G, Gadisa E, Abera A, Chanyalew M, Abebe M, Howe R, Ritter U, Aseffa A, Laskay T. Whole blood-based in vitro culture reveals diminished secretion of pro-inflammatory cytokines and chemokines in visceral leishmaniasis. Cytokine 2020; 145:155246. [PMID: 32828639 DOI: 10.1016/j.cyto.2020.155246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/18/2020] [Accepted: 08/08/2020] [Indexed: 11/28/2022]
Abstract
The likelihood of being bitten by sand flies infected with Leishmania (L.) donovani is considered to be high for all inhabitants living in the endemic areas, but only a small ratio of the population develop symptomatic visceral leishmanisis (VL). Since adequate activation of antimicrobial immune response plays a key role in control of pathogens early after infection we hypothesized that a dysfunction of essential cells of the immune system is associated with disease development after infection with L. donovani. In order to obtain insights into the capacity of leukocytes to respond to L. donovani, a whole blood based assay was applied to evaluate the production of cytokines and chemokines in clinical VL versus Ethiopian endemic healthy control (EHC). In response to L. donovani, VL blood cultures showed significantly lower secretion of IL-12p70, IL-6, IL-17, IL-8 and IP-10 compared to EHC. On the contrary, there was a significantly higher secretion of IL-10 observed in VL compared to EHC. In response to LPS also a lower IL-1β, IL-12p70 and IL-6 secretion was observed in VL as compared to EHC. The data clearly indicate a diminished ability of blood leukocytes in VL to respond to L. donovani and to the TLR ligand LPS. This compromised response in VL may contribute to the severe disease development and enhanced susceptibility to secondary infections in VL.
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Affiliation(s)
- Geremew Tasew
- Ethiopian Public Health Institute, Bacterial, Parasitic and Zoonotic Diseases Research Directorate, P.O. Box 1242, Addis Ababa, Ethiopia.
| | - Endalamaw Gadisa
- Armauer Hansen Research Institute, Neglected Tropical Diseases and Malaria Research Team, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Adugna Abera
- Ethiopian Public Health Institute, Bacterial, Parasitic and Zoonotic Diseases Research Directorate, P.O. Box 1242, Addis Ababa, Ethiopia
| | - Menberework Chanyalew
- Armauer Hansen Research Institute, Neglected Tropical Diseases and Malaria Research Team, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Markos Abebe
- Armauer Hansen Research Institute, Neglected Tropical Diseases and Malaria Research Team, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Rawleigh Howe
- Armauer Hansen Research Institute, Neglected Tropical Diseases and Malaria Research Team, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Uwe Ritter
- Regensburg Center for Interventional Immunology (RCI), Institute of Immunology, University Medical Center Regensburg and University of Regensburg, Regensburg, Germany
| | - Abraham Aseffa
- Armauer Hansen Research Institute, Neglected Tropical Diseases and Malaria Research Team, P.O. Box 1005, Addis Ababa, Ethiopia
| | - Tamás Laskay
- Department of Infectious Diseases and Microbiology, University of Lübeck, Ratzeburger Allee 160, D-23560 Lübeck, Germany
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Kwan PKW, Lin W, Naim ANM, Periaswamy B, De Sessions PF, Hibberd ML, Paton NI. Gene expression responses to anti-tuberculous drugs in a whole blood model. BMC Microbiol 2020; 20:81. [PMID: 32264819 PMCID: PMC7140558 DOI: 10.1186/s12866-020-01766-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 03/26/2020] [Indexed: 12/21/2022] Open
Abstract
Background There is a need for better tools to evaluate new or repurposed TB drugs. The whole blood bactericidal activity (WBA) assay has been advocated for this purpose. We investigated whether transcriptional responses in the WBA assay resemble TB responses in vivo, and whether the approach might additionally reveal mechanisms of action. Results 1422 of 1798 (79%) of differentially expressed genes in WBA incubated with the standard combination of rifampicin, isoniazid, pyrazinamide and ethambutol were also expressed in sputum (P < 0.0001) obtained from patients taking the same combination of drugs; these comprised well-established treatment-response genes. Gene expression profiles in WBA incubated with the standard drugs individually, or with moxifloxacin or faropenem (with amoxicillin and clavulanic acid) clustered by individual drug exposure. Distinct pathways were detected for individual drugs, although only with isoniazid did these relate to known mechanisms of drug action. Conclusions Substantial agreement between whole blood cultures and sputum and the ability to differentiate individual drugs suggest that transcriptomics may add value to the whole blood assay for evaluating new TB drugs.
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Affiliation(s)
- Philip Kam Weng Kwan
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, NUHS Tower Block Level 10, 1E Kent Ridge Road, Singapore, 119228, Singapore
| | - Wenwei Lin
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, NUHS Tower Block Level 10, 1E Kent Ridge Road, Singapore, 119228, Singapore
| | - Ahmad Nazri Mohamed Naim
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore
| | - Balamurugan Periaswamy
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore
| | - Paola Florez De Sessions
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore
| | - Martin L Hibberd
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore.,London School of Hygiene & Tropical Medicine, London, UK.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Nicholas I Paton
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, NUHS Tower Block Level 10, 1E Kent Ridge Road, Singapore, 119228, Singapore. .,Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore. .,London School of Hygiene & Tropical Medicine, London, UK. .,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
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Haredy AM, Takei M, Iwamoto SI, Ohno M, Kosaka M, Hirota K, Koketsu R, Okuno T, Ikuta K, Yamanishi K, Ebina H. Quantification of a cell-mediated immune response against varicella zoster virus by assessing responder CD4 high memory cell proliferation in activated whole blood cultures. Vaccine 2019; 37:5225-5232. [PMID: 31358406 DOI: 10.1016/j.vaccine.2019.07.068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 07/16/2019] [Accepted: 07/18/2019] [Indexed: 11/18/2022]
Abstract
BACKGROUND Herpes zoster (HZ) is caused by reactivation of a latent varicella zoster virus (VZV). The potential to develop HZ increases with age due to waning of memory cell-mediated immunity (CMI), mainly the CD4 response. Therefore, VZV-CD4-memory T cells (CD4-M) count in blood could serve as a barometer for HZ protection. However, direct quantification of these cells is known to be difficult because they are few in number in the blood. We thus developed a method to measure the proliferation level of CD4-M cells responding to VZV antigen in whole blood culture. METHODS Blood samples were collected from 32 children (2-15 years old) with or without a history of varicella infection, 18 young adults (28-45 years old), and 80 elderly (50-86 years old) with a history of varicella infection. The elderly group was vaccinated, and blood samples were taken 2 months and 1 year after VZV vaccination. Then, 1 mL of blood was mixed with VZV, diluted 1/10 in medium, and cultured. CD4-M cells were identified and measured by flow cytometry. RESULTS There was distinct proliferation of CD3+CD4highCD45RA-RO+ (CD4high-M) cells specific to VZV antigen at day 9. The majority of CD4high-M cells had the effector memory phenotype CCR7- and was granzyme B-positive. CD4high-M cells were detected in blood culture from varicella-immune but not varicella-non-immune children. Meanwhile, a higher level of CD4high-M proliferation was observed in young adults than in the elderly. The CD4high-M proliferation level was boosted 2 months after VZV vaccination and maintained for at least 1 year in the elderly. CONCLUSION Quantifying VZV responder CD4high -M cell proliferation is a convenient way to measure VZV CMI using small blood volumes. Our method can be applied to measure VZV vaccine-induced CMI in the elderly. Clinical study registry numbers: (www.clinicaltrials.jp) 173532 and 183985.
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Affiliation(s)
- Ahmad M Haredy
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan.
| | | | | | | | - Mitsuyo Kosaka
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan
| | - Kazue Hirota
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan
| | - Ritsuko Koketsu
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan
| | - Toshiomi Okuno
- Department of Microbiology, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Kazuyoshi Ikuta
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan
| | - Koichi Yamanishi
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan
| | - Hirotaka Ebina
- Biken Center for Innovative Vaccine Research and Development, The Research Foundation for Microbial Diseases of Osaka University (BIKEN), Suita, Osaka, Japan
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Linge M, Hedrich CM, Rösen-Wolff A, Winkler S. Interference of canakinumab with commercial IL-1β ELISAs. Clin Immunol 2019; 205:6-7. [PMID: 31096037 DOI: 10.1016/j.clim.2019.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 05/13/2019] [Indexed: 11/23/2022]
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10
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Abstract
Neutrophils play an essential role in the protection against infection, as they are the most numerous circulating white blood cell population and the first responders to injury. Their numbers in blood are frequently measured in the clinic and used as an indicator of ongoing infections. During inflammation and sepsis, the ability of neutrophils to migrate is disrupted, which may increase the risk of infection, even when the neutrophil count is normal. However, measurements of neutrophil migration in patients are rarely performed because of the challenges of performing the migration assays in a clinical setting. Here, we describe a microfluidic assay that measures the spontaneous neutrophil migration signatures associated with sepsis. The assay uses one droplet of patient's blood in a microfluidic device, which circumvents the need for neutrophil isolation from blood. This assay may also be useful for the study of the effect of various immune modulators on neutrophil migration behavior from healthy volunteers and patients.
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Affiliation(s)
- Sinan Muldur
- BioMEMS Resource Center, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Shriners Burns Hospital, Boston, MA, United States
| | - Anika L Marand
- BioMEMS Resource Center, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Shriners Burns Hospital, Boston, MA, United States
| | - Felix Ellett
- BioMEMS Resource Center, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Shriners Burns Hospital, Boston, MA, United States.
| | - Daniel Irimia
- BioMEMS Resource Center, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Shriners Burns Hospital, Boston, MA, United States.
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Spierenburg EAJ, Portengen L, Smit LAM, Krop EJM, Hylkema MN, Rijkers GT, Heederik D, Wouters IM. Stability of individual LPS-induced ex vivo cytokine release in a whole blood assay over a five-year interval. J Immunol Methods 2018; 460:119-124. [PMID: 30056942 DOI: 10.1016/j.jim.2018.06.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 06/15/2018] [Accepted: 06/28/2018] [Indexed: 11/17/2022]
Abstract
OBJECTIVE In epidemiological and clinical studies, whole blood assay (WBA) has been used as a measure to characterize inter-individual differences in the cytokine response of individuals exposed to inflammatory agents, such as endotoxins. Several short-time repeatability studies have shown stable cytokine levels in individuals over periods of days, weeks or months, but little is known about the long-term stability of cytokine reactivity. METHODS We studied cytokine response levels in LPS-stimulated whole blood in a cohort of 193 farmers and agricultural industry workers at two time points with a five-year interval. RESULTS IL-10 and IL-1β responses measured with a five-year time interval showed a weak positive correlation (r = 0.22 and 0.27, respectively), whereas no correlation was observed for TNFα (r = 0.06). Cytokine reactivity measured repeatedly at the same time point showed high correlations (IL-10 r = 0.80, IL-1β r = 0.53 and TNFα r = 0.74), suggesting that the observed weak correlations over time are reflective of actual variations in cytokine reactivity over time. CONCLUSIONS Repeatability of ex vivo cytokine reactivity showed to be differential for the measured cytokines, being more stable for IL-10 and IL-1β than for TNFα. However, in general, repeatability of ex vivo cytokine reactivity was weak, reflecting that cytokine reactivity can mostly be explained by (short term) intra-individual (immunological) or time varying environmental factors and less by genetic or other time-invariant factors. Therefore, WBA should be regarded as a viable tool to study relationships with current health status and exposure, and only partially as a predictor for a future response.
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Affiliation(s)
- E A J Spierenburg
- Institute for Risk Assessment Sciences, Division Environmental Epidemiology and Veterinary Public Health, Utrecht University, Netherlands
| | - L Portengen
- Institute for Risk Assessment Sciences, Division Environmental Epidemiology and Veterinary Public Health, Utrecht University, Netherlands
| | - L A M Smit
- Institute for Risk Assessment Sciences, Division Environmental Epidemiology and Veterinary Public Health, Utrecht University, Netherlands
| | - E J M Krop
- Institute for Risk Assessment Sciences, Division Environmental Epidemiology and Veterinary Public Health, Utrecht University, Netherlands
| | - M N Hylkema
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; GRIAC- Groningen Research Institute for Asthma and COPD, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - G T Rijkers
- Department of Sciences, University College Roosevelt, Middelburg, the Netherlands
| | - D Heederik
- Institute for Risk Assessment Sciences, Division Environmental Epidemiology and Veterinary Public Health, Utrecht University, Netherlands
| | - I M Wouters
- Institute for Risk Assessment Sciences, Division Environmental Epidemiology and Veterinary Public Health, Utrecht University, Netherlands.
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Galbiati V, Cornaghi L, Gianazza E, Potenza MA, Donetti E, Marinovich M, Corsini E. In vitro assessment of silver nanoparticles immunotoxicity. Food Chem Toxicol 2018; 112:363-374. [PMID: 29331734 DOI: 10.1016/j.fct.2017.12.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 11/22/2017] [Accepted: 12/15/2017] [Indexed: 11/16/2022]
Abstract
This study aimed to characterize unwanted immune effects of nanoparticles (NP) using THP-1 cells, human whole blood and enriched peripheral blood monocytes. Commercially available silver NP (AgNP < 100 nm, also confirmed by Single Particle Extinction and Scattering) were used as prototypical NP. Cells were treated with AgNP alone or in combination with classical immune stimuli (i.e. LPS, PHA, PWM) and cytokine assessed; in addition, CD54 and CD86 expression was evaluated in THP-1 cells. AgNP alone induced dose-related IL-8 production in all models, with higher response observed in THP-1 cells, possibly connected to different protein corona formation in bovine versus human serum. AgNP potentiated LPS-induced IL-8 and TNF-α, but not LPS-induced IL-10. AgNP alone induced slight increase in IL-4, and no change in IFN-γ production. While responses to PHA in term of IL-4 and IFN-γ production were not affected, increased PWM-induced IL-4 and IFN-γ production were observed, suggesting potentiation of humoral response. Reduction in PHA-induced IL-10 was observed. Overall, results indicate immunostimulatory effects. THP-1 cells work as well as primary cells, representing a useful and practical alternative, with the awareness that from a physiological point of view the whole blood assay is the one that comes closest to reality.
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Affiliation(s)
- Valentina Galbiati
- Laboratory of Toxicology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, 20133 Milan, Italy; Department of Environmental Science and Policy, Università degli Studi di Milano, 20133 Milan, Italy
| | - Laura Cornaghi
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, 20133 Milan, Italy
| | - Elisabetta Gianazza
- Gruppo di Studio per la Proteomica e la Struttura delle Proteine, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Marco A Potenza
- Dipartimento di Fisica, Università degli Studi di Milano, 20133 Milan, Italy
| | - Elena Donetti
- Department of Environmental Science and Policy, Università degli Studi di Milano, 20133 Milan, Italy
| | - Marina Marinovich
- Laboratory of Toxicology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, 20133 Milan, Italy.
| | - Emanuela Corsini
- Laboratory of Toxicology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, 20133 Milan, Italy; Department of Environmental Science and Policy, Università degli Studi di Milano, 20133 Milan, Italy.
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13
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Grinstein L, Endter K, Hedrich CM, Reinke S, Luksch H, Schulze F, Robertson AAB, Cooper MA, Rösen-Wolff A, Winkler S. An optimized whole blood assay measuring expression and activity of NLRP3, NLRC4 and AIM2 inflammasomes. Clin Immunol 2017; 191:100-109. [PMID: 29183866 DOI: 10.1016/j.clim.2017.11.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 10/22/2017] [Accepted: 11/24/2017] [Indexed: 10/18/2022]
Abstract
The proinflammatory protease caspase-1 plays pivotal roles in central pathways of innate immunity, thereby contributing to pathogen clearance. Beside its physiological role, dysregulated activity of caspase-1 is known to contribute to an increasing number of diseases. In this study, we optimized and validated a low-volume human whole blood assay facilitating the measurement of caspase-1 activation and inflammasome-related gene expression upon stimulation of the NLRP3, NLRC4 or AIM2 inflammasome. Using the NLRP3 inflammasome specific inhibitor MCC950, we were able to measure the activity of canonical or alternative NLRP3 pathways, AIM2 and NLRC4 inflammasomes in whole blood. Based on our data we assume a superposition of NLRP3 and NLRC4 inflammasome activities in human whole blood following stimulation with S. typhimurium. The optimized whole blood assay may be suitable for diagnostic and research purposes for pediatric patients who can only donate small amounts of blood.
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Affiliation(s)
- Lev Grinstein
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Kristin Endter
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Christian M Hedrich
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany; Department of Women's & Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, UK; Department of Paediatric Rheumatology, Alder Hey Children's NHS Foundation Trust Hospital, Liverpool, UK
| | - Sören Reinke
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Hella Luksch
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Felix Schulze
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Avril A B Robertson
- Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia
| | - Matthew A Cooper
- Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia
| | - Angela Rösen-Wolff
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Stefan Winkler
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany.
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14
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Grimm I, Weinstock M, Birschmann I, Dreier J, Knabbe C, Vollmer T. Strain-dependent interactions of Streptococcus gallolyticus subsp. gallolyticus with human blood cells. BMC Microbiol 2017; 17:210. [PMID: 29078765 PMCID: PMC5658974 DOI: 10.1186/s12866-017-1116-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 10/18/2017] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Streptococcus gallolyticus subsp. gallolyticus (S. gallolyticus) is the causative pathogen in up to 20% of streptococcal-induced infective endocarditis (IE) cases. However, the underlying mechanisms of pathogenesis in S. gallolyticus have not yet been solved. Pathogens causing IE need to employ virulent strategies to initiate and establish infections, such as escape the bloodstream, invade the host-cell, and persist intracellularly. In this study, we examined the induction of inflammation by different S. gallolyticus strains in relation to their survival in whole blood and cell culture models as well as their ability to induce platelet aggregation. Phagocytosis of these bacteria by macrophages, followed by intracellular survival, was also quantified. METHODS In whole blood and THP-1 cell culture assays bacterial growth kinetics was determined by plating, followed by colony counting. Induction of interleukin (IL)-6 expression in whole blood of three healthy volunteers, caused by different strains, was quantified by ELISA. Gene expression of cytokines (IL1B, IL6 and IL8) was quantified by real-time PCR after stimulating THP-1 monocytes with bacteria. Induction of platelet aggregation was analyzed by light transmission aggregometry using the BORN method. A macrophage model was used to analyze phagocytosis of strains and their survival in macrophages within 48 h. RESULTS Strains promoted IL-6 secretion in a time-dependent fashion. For example, DSM16831 induced IL-6 secretion in whole blood earlier than other isolates, and was eliminated in the whole blood of one volunteer, whereas UCN34 could grow. Platelet aggregation depended on the different isolates used and on the individual platelet donor. Two strains (AC1181 and 010672/01) induced cytokine gene expression in THP-1 monocytes only marginally, compared to other strains. The phagocytosis rate of S. gallolyticus isolates differed significantly, and the isolates UCN34 and BAA-2069 could persist for a considerable time in the phagocytes. CONCLUSION The strain-dependent differences of S. gallolyticus isolates, observed during interaction with human blood cells, support the hypotheses that divergences in individual virulence factors determine a distinct pathogenicity of the isolates. These data constitute an additional step towards the elucidation of mechanisms in the complex, multifactorial pathogenesis of this IE pathogen.
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Affiliation(s)
- Imke Grimm
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinikum der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Melanie Weinstock
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinikum der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Ingvild Birschmann
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinikum der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Jens Dreier
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinikum der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Cornelius Knabbe
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinikum der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Tanja Vollmer
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinikum der Ruhr-Universität Bochum, Bad Oeynhausen, Germany.
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15
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Ribeiro A, Ritter T, Griffin M, Ceredig R. Development of a flow cytometry-based potency assay for measuring the in vitro immunomodulatory properties of mesenchymal stromal cells. Immunol Lett 2016; 177:38-46. [PMID: 27451032 DOI: 10.1016/j.imlet.2016.07.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/04/2016] [Accepted: 07/19/2016] [Indexed: 01/14/2023]
Abstract
Human bone marrow-derived mesenchymal stromal/stem cells (MSC) have well-documented modulatory effects on multiple immune cell types. Although these effects are linked to their therapeutic benefit in diverse diseases, a reliable, quantitative assay of the immunomodulatory potency of individual human MSC preparations is lacking. The aims of this study were to develop an optimised rapid turnaround, flow cytometry-based whole-blood assay to monitor MSC potency and to validate its application to MSC immunomodulation. A protocol for short-term LPS stimulation of anti-coagulated whole blood samples followed by combined surface CD45/CD14 and intracellular TNF-α staining was initially developed for analysis on a 4 colour desktop cytometer. Optimal monocyte activation was dependent on the presence of extracellular calcium ions thereby precluding the use of EDTA and sodium citrate as anticoagulants. Optimal assay conditions proved to be 1ng/mL ultrapure-LPS added to 10-fold diluted, heparin anti-coagulated whole blood incubated for 6h at 37°C. Under these conditions, addition of human bone marrow-derived MSC (hBM-MSC) from multiple donors resulted in a reproducible, dose-dependent inhibition of LPS-stimulated monocyte TNF-α expression. We conclude that this protocol represents a practical, quantitative assay of a clinically relevant functional effect of hBM-MSCs as well as other immunomodulatory agents.
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Affiliation(s)
- Andreia Ribeiro
- Regenerative Medicine Institute, National Centre for Biomedical Engineering Science and School of Medicine, National University of Ireland, Galway, Ireland.
| | - Thomas Ritter
- Regenerative Medicine Institute, National Centre for Biomedical Engineering Science and School of Medicine, National University of Ireland, Galway, Ireland.
| | - Matthew Griffin
- Regenerative Medicine Institute, National Centre for Biomedical Engineering Science and School of Medicine, National University of Ireland, Galway, Ireland.
| | - Rhodri Ceredig
- Regenerative Medicine Institute, National Centre for Biomedical Engineering Science and School of Medicine, National University of Ireland, Galway, Ireland.
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16
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Singh N, Kumar R, Engwerda C, Sacks D, Nylen S, Sundar S. Tumor necrosis factor alpha neutralization has no direct effect on parasite burden, but causes impaired IFN-γ production by spleen cells from human visceral leishmaniasis patients. Cytokine 2016; 85:184-90. [PMID: 27372917 DOI: 10.1016/j.cyto.2016.06.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 06/07/2016] [Accepted: 06/08/2016] [Indexed: 01/25/2023]
Abstract
The pro-inflammatory cytokine tumor necrosis factor (TNF)-α has an important role in control of experimental Leishmania donovani infection. Less is known about the role of TNF-α in human visceral leishmaniasis (VL). Evidence for a protective role is primarily based on case reports of VL development in individuals treated with TNF-α neutralizing antibody. In this study, we have evaluated how TNF-α neutralization affects parasite replication and cytokine production in ex vivo splenic aspirates (SA) from active VL patients. The effect of TNF-α neutralization on cell mediated antigen specific responses were also evaluated using whole blood cultures. Neutralization of TNF-α did not affect parasite numbers in SA cultures. Interferon (IFN)-γ levels were significantly reduced, but interleukin (IL)-10 levels were unchanged in these cultures. Leishmania antigen stimulated SA produced significant TNF-α which suggests that TNF-α is actively produced in VL spleen. Further it stimulates IFN-γ production, but no direct effect on parasite replication.
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17
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Harausz EP, Chervenak KA, Good CE, Jacobs MR, Wallis RS, Sanchez-Felix M, Boom WH. Activity of nitazoxanide and tizoxanide against Mycobacterium tuberculosis in vitro and in whole blood culture. Tuberculosis (Edinb) 2016; 98:92-6. [PMID: 27156623 DOI: 10.1016/j.tube.2016.03.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 03/08/2016] [Accepted: 03/15/2016] [Indexed: 11/18/2022]
Abstract
Nitazoxanide (NTZ) and its metabolite tizoxanide (TIZ) were studied as antimycobacterial agents in vitro (in mycobacterial growth indicator tube [MGIT] cultures) and in a whole blood bactericidal assay. Both NTZ and TIZ show high protein binding. In MGIT cultures (albumin concentration = 78 μM), inhibition of Mycobacterium tuberculosis growth occurred at total drug concentrations of ≥16 μg/ml, whereas in whole blood cultures (albumin concentration = 350 μM), ≥128 μg/ml was required. Free drug fractions at these two conditions were estimated to be 69% and 2%, respectively. Co-incubation of NTZ and TIZ in human plasma for 72 h nearly completely eliminated their ability to inhibit mycobacterial growth in MGIT. Interactions with plasma proteins may limit the potential of NTZ and TIZ as drugs for human tuberculosis.
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Affiliation(s)
- Elizabeth P Harausz
- Department of Medicine, Case Western Reserve University, University Hospitals Case Medical Center, 10900 Euclid Ave, Cleveland, OH 44106, USA.
| | - Keith A Chervenak
- Department of Medicine, Case Western Reserve University, University Hospitals Case Medical Center, 10900 Euclid Ave, Cleveland, OH 44106, USA.
| | - Caryn E Good
- Department of Pathology, Case Western Reserve University, University Hospitals Case Medical Center, 10900 Euclid Ave, Cleveland, OH 44106, USA.
| | - Michael R Jacobs
- Department of Pathology, Case Western Reserve University, University Hospitals Case Medical Center, 10900 Euclid Ave, Cleveland, OH 44106, USA.
| | - Robert S Wallis
- Aurum Institute, 29 Queens Rd, Parktown, Johannesburg, South Africa.
| | | | - W Henry Boom
- Department of Medicine, Case Western Reserve University, University Hospitals Case Medical Center, 10900 Euclid Ave, Cleveland, OH 44106, USA.
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18
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Klümper C, Krämer U, Lehmann I, von Berg A, Berdel D, Herberth G, Beckmann C, Link E, Heinrich J, Hoffmann B, Schins RPF. Air pollution and cytokine responsiveness in asthmatic and non-asthmatic children. Environ Res 2015; 138:381-90. [PMID: 25769127 DOI: 10.1016/j.envres.2015.02.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 02/23/2015] [Accepted: 02/26/2015] [Indexed: 05/23/2023]
Abstract
Epidemiological studies indicate that asthmatic children are more susceptible to traffic-related air pollution exposure than non-asthmatic children. Local and systemic inflammation in combination with oxidative stress have been suggested as a possible susceptibility factor. We investigated effect modification by asthma status for the association between air pollution exposure and systemic effects using whole blood cytokine responsiveness as an inflammatory marker. The study was nested within the two German birth cohort studies GINIplus and LISAplus and initially designed as a random sub-sample enriched with asthmatic children. Using data from 27 asthmatic and 59 non-asthmatic six-year-old children we measured the production of Interleukin-6 (IL)-6, IL-8, IL-10, monocyte chemotactic protein-1 (MCP-1), tumour necrosis factor-alpha (TNF-alpha) and interferon-gamma (IFN-gamma) in whole blood after ex-vivo stimulation with urban particulate matter (EHC-93). Air pollution exposure (nitrogen dioxide (NO2), nitrogen oxides (NOx), particulate matter with an aerodynamic diameter <10μm (PM10), particulate matter with an aerodynamic diameter <2.5μm (PM2.5mass), coarse particulate matter (PMcoarse) and PM2.5absorbance (PM2.5abs)) was modelled for children´s home addresses applying land-use regression. To assess effect modification by asthma status linear regression models with multiplicative interaction terms were used. In asthmatics exposure to NO2 was associated with higher production of pro-inflammatory cytokines: adjusted means ratio (MR) 2.22 (95% confidence interval 1.22-4.04) for IL-6 per 2.68µg/m³ NO2. The interaction term between asthma status and NO2 exposure was significant. Results for NOx, PM10, PM2.5mass and PM2.5abs were in the same direction. No association between air pollution and cytokine responsiveness was found in the group of non-asthmatic children and in the overall group. Traffic-related air pollution exposure is associated with higher pro-inflammatory cytokine responsiveness in whole blood of asthmatic children.
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Affiliation(s)
- Claudia Klümper
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany.
| | - Ursula Krämer
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Irina Lehmann
- Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Immunology, Leipzig, Germany
| | - Andrea von Berg
- Research Institute, Children´s Department, Marien-Hospital, Wesel, Germany
| | - Dietrich Berdel
- Research Institute, Children´s Department, Marien-Hospital, Wesel, Germany
| | - Gunda Herberth
- Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Immunology, Leipzig, Germany
| | - Christina Beckmann
- Research Institute, Children´s Department, Marien-Hospital, Wesel, Germany
| | - Elke Link
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Joachim Heinrich
- Helmholtz Centre Munich, German Research Centre for Environmental Health, Institute of Epidemiology, Munich, Germany
| | - Barbara Hoffmann
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany; Heinrich-Heine University of Düsseldorf, Medical Faculty, Deanery of Medicine, Düsseldorf, Germany
| | - Roel P F Schins
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
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Gangamma S. Characteristics of airborne bacteria in Mumbai urban environment. Sci Total Environ 2014; 488-489:70-74. [PMID: 24815556 DOI: 10.1016/j.scitotenv.2014.04.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Revised: 04/14/2014] [Accepted: 04/16/2014] [Indexed: 06/03/2023]
Abstract
Components of biological origin constitute small but a significant proportion of the ambient airborne particulate matter (PM). However, their diversity and role in proinflammatory responses of PM are not well understood. The present study characterizes airborne bacterial species diversity in Mumbai City and elucidates the role of bacterial endotoxin in PM induced proinflammatory response in ex vivo. Airborne bacteria and endotoxin samples were collected during April-May 2010 in Mumbai using six stage microbial impactor and biosampler. The culturable bacterial species concentration was measured and factors influencing the composition were identified by principal component analysis (PCA). The biosampler samples were used to stimulate immune cells in whole blood assay. A total of 28 species belonging to 17 genera were identified. Gram positive and spore forming groups of bacteria dominated the airborne culturable bacterial concentration. The study indicated the dominance of spore forming and human or animal flora derived pathogenic/opportunistic bacteria in the ambient air environment. Pathogenic and opportunistic species of bacteria were also present in the samples. TNF-α induction by PM was reduced (35%) by polymyxin B pretreatment and this result was corroborated with the results of blocking endotoxin receptor cluster differentiation (CD14). The study highlights the importance of airborne biological particles and suggests need of further studies on biological characterization of ambient PM.
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Affiliation(s)
- S Gangamma
- Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, India.
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20
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Abstract
For years, the ability to study immune responses in patients with active visceral leishmaniasis (VL) has been hampered by the absence of detectable antigen-specific Th1 responses using cells from peripheral blood mononuclear cells (PBMCs). Employing whole blood assay (WBA), we recently reported that whole blood cells of active VL patients maintain the capacity to secrete significant levels of antigen driven IFN-γ and IL-10. Furthermore, WBA that uses soluble leishmania antigen (SLA) have advantages over the leishmanin skin test (LST), in terms of higher specificity and better correlation with surrogate markers of exposures to Leishmania donovani. These findings open the door to a series of immunological and epidemiological studies not previously possible for VL. In the present review, we discuss current status, future perspectives as well as obstacles in the research on WBA. Research in this area is essential for development of potential immunological and epidemiological tools for VL.
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Affiliation(s)
- Om Prakash Singh
- Infectious Disease Research Laboratory, Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, India
| | - Shyam Sundar
- Infectious Disease Research Laboratory, Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, India.
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