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Albanesi M, Nico A, Sinisi A, Giliberti L, Rossi MP, Rossini M, Kourtis G, Rucco AS, Loconte F, Muolo L, Zurlo M, Di Bona D, Caiaffa MF, Macchia L. A 13-year real-life study on efficacy, safety and biological effects of Vespula venom immunotherapy. Clin Mol Allergy 2018; 16:2. [PMID: 29375272 PMCID: PMC5774115 DOI: 10.1186/s12948-017-0079-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 12/18/2017] [Indexed: 11/10/2022] Open
Abstract
Background Hymenoptera venom immunotherapy (VIT) is a clinically effective treatment. However, little is known about its long-term clinical efficacy and biological effects. Several mechanisms have been proposed to account for VIT efficacy, including reduction of specific IgE and induction of allergen-specific IgG4, but the overall picture remains elusive. We investigated Vespula VIT clinical efficacy up to 8 years after discontinuation and the kinetics of Vespula-specific IgE and IgG4. Out of 686 consecutive patients we retrospectively selected and analysed a series of 23 patients with Vespula allergy that underwent a 5-year IT course, followed by a prolonged follow-up. Methods Clinical efficacy of VIT was assessed as number and severity of reactions to Vespula re-stinging events. The presence of Vespula-specific IgE and IgG4 was also monitored over time. Results During the VIT treatment, patients were protected, reporting no reactions or mild reactions in occasion of re-stinging events. This protection was entirely maintained during the follow-up, up to 8 years. Skin reactivity (reflecting mast cell-bound Vespula-specific IgE) and circulating Vespula-specific IgE levels declined substantially during VIT. Notably, this reduction was maintained over time during the follow-up. Moreover, all the patients were analysed for IgG4. A robust induction of Vespula-specific IgG4 was observed during the VIT course, with a substantial decline during the follow-up. Conclusions We conclude that Vespula VIT is a clinically effective treatment, which induces long-term protection after discontinuation. The reduction of specific IgE, assessed by skin tests and RAST, closely matches the VIT- induced protection, while the IgG4 induction seems not to be associated with VIT clinical efficacy in the long term. Electronic supplementary material The online version of this article (10.1186/s12948-017-0079-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Marcello Albanesi
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Andrea Nico
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Alessandro Sinisi
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Lucia Giliberti
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Maria Pia Rossi
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Margherita Rossini
- Unit of Clinical Pathology, Policlinico di Bari, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Georgios Kourtis
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Anna Simona Rucco
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Filomena Loconte
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Loredana Muolo
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Marco Zurlo
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Danilo Di Bona
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
| | - Maria Filomena Caiaffa
- 3School and Chair of Allergology and Clinical Immunology, Department of Medical and Surgical Sciences, University of Foggia, Via Luigi Pinto 1, 70100 Foggia, Italy
| | - Luigi Macchia
- 1School and Chair of Allergology and Clinical Immunology, Department of Emergency and Organ Transplantation, University of Bari-Aldo Moro, Piazza Giulio Cesare 13, Policlinico, 70124 Bari, Italy
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Schwartz C, Hams E, Fallon PG. Helminth Modulation of Lung Inflammation. Trends Parasitol 2018; 34:388-403. [PMID: 29339033 DOI: 10.1016/j.pt.2017.12.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 12/11/2017] [Accepted: 12/18/2017] [Indexed: 12/21/2022]
Abstract
Parasitic helminths must establish chronic infections to complete their life cycle and therefore are potent modulators of multiple facets of host physiology. Parasitic helminths have coevolved with humans to become arguably master selectors of our immune system, whereby they have impacted on the selection of genes with beneficial mutations for both host and parasite. While helminth infections of humans are a significant health burden, studies have shown that helminths or helminth products can alter susceptibility to unrelated infectious or inflammatory diseases. This has generated interest in the use of helminth infections or molecules as therapeutics. In this review, we focus on the impact of helminth infections on pulmonary immunity, especially with regard to homeostatic lung function, pulmonary viral and bacterial (co)infections, and asthma.
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Affiliation(s)
- Christian Schwartz
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.
| | - Emily Hams
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Padraic G Fallon
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.
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Immune Response to Opisthorchis viverrini Infection and Its Role in Pathology. ADVANCES IN PARASITOLOGY 2018; 102:73-95. [PMID: 30442311 DOI: 10.1016/bs.apar.2018.08.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Human liver fluke infection caused by Opisthorchis viverrini is a major public health problem in Mekong countries such as Thailand, Laos, Cambodia, Vietnam, and Myanmar with over 10 million infected through consumption of fish containing infective metacercariae. With no tissue migration phase and living entirely within the larger secondary (intrahepatic) bile ducts, liver flukes are only exposed to a biliary mucosal immune response, while their excretory and secretory products also stimulate chronic inflammation of biliary epithelium. Neither mucosal nor tissue immune responses appear to cause parasite death or protect against newly established flukes, as evidenced by the persistence of infection for decades in the body and rapid reinfection following treatment. Experimental studies suggest that specific immune suppressive mechanisms may promote parasite persistence, therefore allowing continued secretion of parasite products that damage the biliary epithelium, both directly through mechanical damage and mitogenicity and through innate and adaptive inflammatory responses. Chronic infection is associated with several hepatobiliary diseases, specifically gallbladder and bile duct inflammation (cholecystitis and cholangitis), periductal fibrosis, and cholangiocarcinoma, the fatal bile duct cancer. Various studies have linked the chronic immune response to parasite antigens to both fibrosis and many steps in the carcinogenic process. Here, we review research-based understandings of the basic immune response to liver fluke infection and its roles in host protection and immunopathogenesis from available literature and also from recent studies conducted by the authors.
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Ritter M, Ndongmo WPC, Njouendou AJ, Nghochuzie NN, Nchang LC, Tayong DB, Arndts K, Nausch N, Jacobsen M, Wanji S, Layland LE, Hoerauf A. Mansonella perstans microfilaremic individuals are characterized by enhanced type 2 helper T and regulatory T and B cell subsets and dampened systemic innate and adaptive immune responses. PLoS Negl Trop Dis 2018; 12:e0006184. [PMID: 29324739 PMCID: PMC5783424 DOI: 10.1371/journal.pntd.0006184] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 01/24/2018] [Accepted: 12/20/2017] [Indexed: 11/19/2022] Open
Abstract
The filarial nematode Mansonella perstans is endemic throughout Africa, northern South America and the Caribbean. Interestingly, M. perstans-infected individuals present no distinct clinical picture associated with certain pathology. Due to its relatively silent nature, research on this tropical disease has been neglected, especially M. perstans-driven immune responses. A hindrance in obtaining data on M. perstans-specific responses has been the inability to obtain adult worms since their habitats in serous cavities are difficult to access. Thus, in this study, for the first time, we used Mansonella perstans worm antigen extract as stimulant to obtain filarial-specific recall and immunoglobulin responses from M. perstans microfilaremic individuals (Mp MF+) from Cameroon. Moreover, systemic immune profiles in sera and immune cell composition in peripheral blood from Mp MF+ and amicrofilaremic individuals (Mp MF-) were obtained. Our data reveal that Mp MF+ individuals showed significantly reduced cytokine (IL-4, IL-6 and IL-12p70) and chemokine levels (IL-8 and RANTES), but significantly higher MIP-1β as well as increased M. perstans-specific IgG4 levels compared to Mp MF- individuals. In contrast, upon re-stimulation with worm antigen extract, IFN-γ, IL-13, IL-10 and IL-17A secretion was enhanced in cell cultures from Mp MF+ individuals when compared to those from cultures of healthy European individuals. Moreover, analysis of immune cell composition in peripheral blood from Mp MF+ individuals revealed increased type 2 helper T (Th2), natural killer (NK), regulatory B and T cell (Breg and Treg) subsets but decreased type 1 regulatory T (Tr1) cells. In summary, this study deciphers for the first time, M. perstans-specific immune responses using worm antigen extract and shows that patent M. perstans infections have distinct Th2, Breg and Treg subsets accompanied with reduced systemic innate and adaptive immune responses and dominant filarial-specific IgG4 levels.
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Affiliation(s)
- Manuel Ritter
- Institute of Medical Microbiology, Immunology and Parasitology, University Hospital of Bonn, Germany
| | - Winston Patrick Chounna Ndongmo
- Parasite and Vector Research Unit (PAVRU), Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
- Research Foundation for Tropical Diseases and the Environment (REFOTDE), Buea, Cameroon
| | - Abdel Jelil Njouendou
- Parasite and Vector Research Unit (PAVRU), Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
- Research Foundation for Tropical Diseases and the Environment (REFOTDE), Buea, Cameroon
| | - Nora Nganyewo Nghochuzie
- Parasite and Vector Research Unit (PAVRU), Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
- Research Foundation for Tropical Diseases and the Environment (REFOTDE), Buea, Cameroon
| | - Lucy Cho Nchang
- Parasite and Vector Research Unit (PAVRU), Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
- Research Foundation for Tropical Diseases and the Environment (REFOTDE), Buea, Cameroon
| | - Dizzle Bita Tayong
- Parasite and Vector Research Unit (PAVRU), Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
- Research Foundation for Tropical Diseases and the Environment (REFOTDE), Buea, Cameroon
| | - Kathrin Arndts
- Institute of Medical Microbiology, Immunology and Parasitology, University Hospital of Bonn, Germany
| | - Norman Nausch
- Department of General Pediatrics, Neonatology, and Pediatric Cardiology, University Children’s Hospital, Medical Faculty, Duesseldorf, Germany
| | - Marc Jacobsen
- Department of General Pediatrics, Neonatology, and Pediatric Cardiology, University Children’s Hospital, Medical Faculty, Duesseldorf, Germany
| | - Samuel Wanji
- Parasite and Vector Research Unit (PAVRU), Department of Microbiology and Parasitology, University of Buea, Buea, Cameroon
- Research Foundation for Tropical Diseases and the Environment (REFOTDE), Buea, Cameroon
| | - Laura E. Layland
- Institute of Medical Microbiology, Immunology and Parasitology, University Hospital of Bonn, Germany
- German Centre for Infection Research (DZIF), partner site, Bonn-Cologne, Bonn, Germany
| | - Achim Hoerauf
- Institute of Medical Microbiology, Immunology and Parasitology, University Hospital of Bonn, Germany
- German Centre for Infection Research (DZIF), partner site, Bonn-Cologne, Bonn, Germany
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Antibody-Based Protective Immunity against Helminth Infections: Antibody Phage Display Derived Antibodies against BmR1 Antigen. Int J Mol Sci 2017; 18:ijms18112376. [PMID: 29165352 PMCID: PMC5713345 DOI: 10.3390/ijms18112376] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 10/25/2017] [Accepted: 11/02/2017] [Indexed: 12/18/2022] Open
Abstract
Helminth parasite infections are significantly impacting global health, with more than two billion infections worldwide with a high morbidity rate. The complex life cycle of the nematodes has made host immune response studies against these parasites extremely difficult. In this study, we utilized two phage antibody libraries; the immune and naïve library were used to identify single chain fragment variable (scFv) clones against a specific filarial antigen (BmR1). The V-gene analysis of isolated scFv clones will help shed light on preferential VDJ gene segment usage against the filarial BmR1 antigen in healthy and infected states. The immune library showed the usage of both lambda and kappa light chains. However, the naïve library showed preferential use of the lambda family with different amino acid distributions. The binding characteristics of the scFv clones identified from this work were analyzed by immunoassay and immunoaffinity pull down of BmR1. The work highlights the antibody gene usage pattern of a naïve and immune antibody library against the same antigen as well as the robust nature of the enriched antibodies for downstream applications.
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Calcagno MA, Forastiero MA, Saracino MP, Vila CC, Venturiello SM. Serum IgE and IgG4 against muscle larva excretory-secretory products during the early and late phases of human trichinellosis. Parasitol Res 2017; 116:2933-2939. [DOI: 10.1007/s00436-017-5601-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 08/24/2017] [Indexed: 10/18/2022]
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Togre NS, Bhoj PS, Khatri VK, Tarnekar A, Goswami K, Shende MR, Reddy MVR. SXP-RAL Family Filarial Protein, rWbL2, Prevents Development of DSS-Induced Acute Ulcerative Colitis. Indian J Clin Biochem 2017; 33:282-289. [PMID: 30072827 DOI: 10.1007/s12291-017-0671-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 06/07/2017] [Indexed: 12/21/2022]
Abstract
Helminthic infections lead to the release of various molecules which play an important role in modulation of the host immune system. Such filarial proteins with immunomodulatory potential can be used for therapeutic purpose in inflammatory and immune mediated diseases. In the present study, we have explored the prophylactic effect of filarial SXP-RAL family protein of Wuchereria bancrofti i.e. rWbL2 protein in DSS induced inflammatory ulcerative colitis in a mouse model. Prior treatment of rWbL2, followed by induction of colitis, showed significantly reduced disease severity as indicated by the decreased disease manifestations and improved macroscopic and microscopic inflammation. This preventive effect was found to be associated with increased release of anti-inflammatory cytokine IL-10 and decreased release of proinflammatory cytokines IFN-γ, TNF-α, IL-6 and IL-17 by the splenocytes of treated mice. From this study, it can be envisaged that pretreatment with filarial protein, rWbL2, can prevent the establishment of ulcerative colitis in BALB/c mice. The underlying immunological mechanism may involve the up-regulation of Th2 immune response with down-regulation of Th1 response.
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Affiliation(s)
- Namdev S Togre
- 1Department of Biochemistry, JB Tropical Disease Research Centre, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
| | - Priyanka S Bhoj
- 1Department of Biochemistry, JB Tropical Disease Research Centre, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
| | - Vishal K Khatri
- 1Department of Biochemistry, JB Tropical Disease Research Centre, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
| | - Aditya Tarnekar
- 2Department of Anatomy, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
| | - Kalyan Goswami
- 1Department of Biochemistry, JB Tropical Disease Research Centre, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
| | - Moreshwar R Shende
- 2Department of Anatomy, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
| | - M V R Reddy
- 1Department of Biochemistry, JB Tropical Disease Research Centre, Mahatma Gandhi Institute of Medical Sciences, Sevagram, MS 442102 India
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Prodjinotho UF, von Horn C, Debrah AY, Batsa Debrah L, Albers A, Layland LE, Hoerauf A, Adjobimey T. Pathological manifestations in lymphatic filariasis correlate with lack of inhibitory properties of IgG4 antibodies on IgE-activated granulocytes. PLoS Negl Trop Dis 2017; 11:e0005777. [PMID: 28742098 PMCID: PMC5542694 DOI: 10.1371/journal.pntd.0005777] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 08/03/2017] [Accepted: 07/05/2017] [Indexed: 12/24/2022] Open
Abstract
Helminth parasites are known to be efficient modulators of their host's immune system. To guarantee their own survival, they induce alongside the classical Th2 a strong regulatory response with high levels of anti-inflammatory cytokines and elevated plasma levels of IgG4. This particular antibody was shown in different models to exhibit immunosuppressive properties. How IgG4 affects the etiopathology of lymphatic filariasis (LF) is however not well characterized. Here we investigate the impact of plasma and affinity-purified IgG/IgG4 fractions from endemic normals (EN) and LF infected pathology patients (CP), asymptomatic microfilaraemic (Mf+) and amicrofilaraemic (Mf-) individuals on IgE/IL3 activated granulocytes. The activation and degranulation states were investigated by monitoring the expression of CD63/HLADR and the release of granule contents (neutrophil elastase (NE), eosinophil cationic protein (ECP) and histamine) respectively by flow cytometry and ELISA. We could show that the activation of granulocytes was inhibited in the presence of plasma from EN and Mf+ individuals whereas those of Mf- and CP presented no effect. This inhibitory capacity was impaired upon depletion of IgG in Mf+ individuals but persisted in IgG-depleted plasma from EN, where it strongly correlated with the expression of IgA. In addition, IgA-depleted fractions failed to suppress granulocyte activation. Strikingly, affinity-purified IgG4 antibodies from EN, Mf+ and Mf- individuals bound granulocytes and inhibited activation and the release of ECP, NE and histamine. In contrast, IgG4 from CP could not bind granulocytes and presented no suppressive capacity. Reduction of both the affinity to, and the suppressive properties of anti-inflammatory IgG4 on granulocytes was reached only when FcγRI and II were blocked simultaneously. These data indicate that IgG4 antibodies from Mf+, Mf- and EN, in contrast to those of CP, natively exhibit FcγRI/II-dependent suppressive properties on granulocytes. Our findings suggest that quantitative and qualitative alterations in IgG4 molecules are associated with the different clinical phenotypes in LF endemic regions.
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Affiliation(s)
- Ulrich F. Prodjinotho
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Charlotte von Horn
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Alex Y. Debrah
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
- Faculty of Allied Health Sciences and School of Medical Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Linda Batsa Debrah
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
- Department of Clinical Microbiology, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Anna Albers
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Laura E. Layland
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Achim Hoerauf
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
- Bonn-Cologne Site, German Center for Infectious Disease Research (DZIF), Bonn, Germany
| | - Tomabu Adjobimey
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
- Faculté des Sciences et Techniques (FAST), Université d’Abomey-Calavi, Abomey-Calavi, Bénin
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Kwarteng A, Ahuno ST. Immunity in Filarial Infections: Lessons from Animal Models and Human Studies. Scand J Immunol 2017; 85:251-257. [DOI: 10.1111/sji.12533] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 01/27/2017] [Indexed: 02/03/2023]
Affiliation(s)
- A. Kwarteng
- Department of Biochemistry and Biotechnology; Kwame Nkrumah University of Science Technology, PMB; Kumasi Ghana
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR); KNUST, PMB; Kumasi Ghana
| | - S. T. Ahuno
- Department of Biochemistry and Biotechnology; Kwame Nkrumah University of Science Technology, PMB; Kumasi Ghana
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The impact of prenatal exposure to parasitic infections and to anthelminthic treatment on antibody responses to routine immunisations given in infancy: Secondary analysis of a randomised controlled trial. PLoS Negl Trop Dis 2017; 11:e0005213. [PMID: 28178298 PMCID: PMC5298230 DOI: 10.1371/journal.pntd.0005213] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 11/28/2016] [Indexed: 11/25/2022] Open
Abstract
Background Chronic parasitic infections are associated with active immunomodulation which may include by-stander effects on unrelated antigens. It has been suggested that pre-natal exposure to parasitic infections in the mother impacts immunological development in the fetus and hence the offspring’s response to vaccines, and that control of parasitic infection among pregnant women will therefore be beneficial. Methodology/Principal findings We used new data from the Entebbe Mother and Baby Study, a trial of anthelminthic treatment during pregnancy conducted in Uganda, to further investigate this hypothesis. 2705 mothers were investigated for parasitic infections and then randomised to albendazole (400mg) versus placebo and praziquantel (40mg/kg) during pregnancy in a factorial design. All mothers received sulfadoxine/pyrimethamine for presumptive treatment of malaria. Offspring received Expanded Programme on Immunisation vaccines at birth, six, 10 and 14 weeks. New data on antibody levels to diphtheria toxin, three pertussis antigens, Haemophilus influenzae type B (HiB) and Hepatitis B, measured at one year (April 2004 –May 2007) from 1379 infants were analysed for this report. Additional observational analyses relating maternal infections to infant vaccine responses were also conducted. Helminth infections were highly prevalent amongst mothers (hookworm 43.1%, Mansonella 20.9%, Schistosoma mansoni 17.3%, Strongyloides 11.7%, Trichuris 8.1%) and 9.4% had malaria at enrolment. In the trial analysis we found no overall effect of either anthelminthic intervention on the measured infant vaccine responses. In observational analyses, no species was associated with suppressed responses. Strongyloidiasis was associated with enhanced responses to pertussis toxin, HiB and Hep B vaccine antigens. Conclusions/Significance Our results do not support the hypothesis that routine anthelminthic treatment during pregnancy has a benefit for the infant’s vaccine response, or that maternal helminth infection has a net suppressive effect on the offspring’s response to vaccines. Trial Registration ISRCTN.com ISRCTN32849447 Parasitic infections, such as worms and malaria, have potent effects on the human immune system. These effects include modification of immune responses in the fetus and infant if a mother has a parasitic infection during pregnancy. These immunological changes can influence the way a child responds to the same infection when exposed in later life. It has been suggested that the immunological changes might also influence how the child responds to the vaccines given in infancy, and that treating mothers for parasitic infections when they are pregnant might be helpful. In this study we compared responses to vaccines between infants of mothers who had, or had not, been treated for worms while they were pregnant. We found no overall differences. We also compared vaccine responses between groups of mothers with and without parasitic infections. We found no evidence that the parasitic infections were associated with reduced responses in the children. This means that, although treating worms during pregnancy may have some benefits, improvements in the children’s responses to vaccines are not likely to be among them.
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Wang H, Li M, Zhang X, He F, Zhang S, Zhao J. Impairment of peripheral Vdelta2 T cells in human cystic echinococcosis. Exp Parasitol 2017; 174:17-24. [PMID: 28153802 DOI: 10.1016/j.exppara.2017.01.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 01/09/2017] [Accepted: 01/22/2017] [Indexed: 10/25/2022]
Abstract
Cystic echinococcosis (CE) induced by metacestodes (larval stages) of Echinococcus granulosus (E.granulosus) represents a severe endemic disease worldwide. Gamma delta (γδ) T cells, one of innate immune cells, play pivotal role in pathogenic infections. However, whether γδ T cells are involved in CE remains unclear. This study firstly investigated the role of peripheral γδ T cells in CE. The results showed that the percentage of peripheral γδ T cells from CE patients was decreased, compared with healthy controls (HC) (p < 0.01). This decrease was primarily due to a reduction in Vδ2 subset. Furthermore, Vδ2 T cells in CE expressed lower Natural Killer Group 2D (NKG2D) (p < 0.01). The abundance of Vδ2 T cells correlated negatively with cyst burden. To further identify the function of decreased Vδ2 T cells in CE, proliferation rate, cytokine secretion and cytotoxin were detected subsequently in vitro. As a result, the proliferation rate of Vδ2 cells in CE patients was lower than that in HC (p < 0.01). Meanwhile, Vδ2 T cells from CE patients released significantly decreased interferon (IFN)-γ, compared with HC (p < 0.05). Moreover, the levels of perforin and granzyme B of Vδ2 T cells from the patients were decreased significantly (p < 0.05), suggesting impaired cytotoxin generation of Vδ2 cells in CE. Collectively, our findings indicated that circulating Vδ2 T cells in CE was impaired, and these aberrations may contribute to disease pathogenesis.
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Affiliation(s)
- Hao Wang
- Department of Pathogenic Biology and Medical Immunology, Ningxia Medical University, Yinchuan, Ningxia, China; Key Lab of Hydatid Disease, Ningxia Medical University, Yinchuan, Ningxia, China.
| | - Ming Li
- Department of Hepatobiliary Surgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China
| | - Xiaoxia Zhang
- Department of Pathogenic Biology and Medical Immunology, Ningxia Medical University, Yinchuan, Ningxia, China
| | - Fang He
- Department of Gastroenterology, General Hospital of Ningxia Medical University, China
| | - Shengbin Zhang
- Department of General Surgery, Baogang Hospital, Baotou, Inner Mongolia, China
| | - Jiaqing Zhao
- Department of Pathogenic Biology and Medical Immunology, Ningxia Medical University, Yinchuan, Ningxia, China; Key Lab of Hydatid Disease, Ningxia Medical University, Yinchuan, Ningxia, China.
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Lagatie O, Van Dorst B, Stuyver LJ. Identification of three immunodominant motifs with atypical isotype profile scattered over the Onchocerca volvulus proteome. PLoS Negl Trop Dis 2017; 11:e0005330. [PMID: 28125577 PMCID: PMC5295699 DOI: 10.1371/journal.pntd.0005330] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 02/07/2017] [Accepted: 01/14/2017] [Indexed: 01/30/2023] Open
Abstract
Understanding the immune response upon infection with the filarial nematode Onchocerca volvulus and the mechanisms that evolved in this parasite to evade immune mediated elimination is essential to expand the toolbox available for diagnostics, therapeutics and vaccines development. Using high-density peptide microarrays we scanned the proteome-wide linear epitope repertoire in Cameroonian onchocerciasis patients and healthy controls from Southern Africa which led to the identification of 249 immunodominant antigenic peptides. Motif analysis learned that 3 immunodominant motifs, encompassing 3 linear epitopes, are present in 70, 43, and 31 of these peptides, respectively and appear to be scattered over the entire proteome in seemingly non-related proteins. These linear epitopes are shown to have an atypical isotype profile dominated by IgG1, IgG3, IgE and IgM, in contrast to the commonly observed IgG4 response in chronic active helminth infections. The identification of these linear epitope motifs may lead to novel diagnostic development but further evaluation of cross-reactivity against common co-infecting human nematode infections will be needed. Infection with the filarial parasite Onchocerca volvulus is the cause of river blindness. We analyzed the immune response against this parasite in infected individuals in order to identify linear epitopes. Using high-density peptide microarrays we discovered three immunodominant motifs in the Onchocerca volvulus proteome that induce a broad IgG response, but the typical IgG4 immune response against parasites was absent. Our study led to the identification of novel potential epitope sequences that can potentially be used for detection of infection with Onchocerca volvulus.
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Affiliation(s)
- Ole Lagatie
- Janssen Diagnostics, Janssen Pharmaceutica NV, Beerse, Belgium
- * E-mail:
| | - Bieke Van Dorst
- Janssen Diagnostics, Janssen Pharmaceutica NV, Beerse, Belgium
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Jha R, Gangwar M, Chahar D, Setty Balakrishnan A, Negi MPS, Misra-Bhattacharya S. Humans from Wuchereria bancrofti endemic area elicit substantial immune response to proteins of the filarial parasite Brugia malayi and its endosymbiont Wolbachia. Parasit Vectors 2017; 10:40. [PMID: 28118850 PMCID: PMC5259955 DOI: 10.1186/s13071-016-1963-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 12/30/2016] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND In the past, immune responses to several Brugia malayi immunodominant antigens have been characterized in filaria-infected populations; however, little is known regarding Wolbachia proteins. We earlier cloned and characterized few B. malayi (trehalose-6-phosphate phosphatase, Bm-TPP and heavy chain myosin, BmAF-Myo) and Wolbachia (translation initiation factor-1, Wol Tl IF-1 and NAD+-dependent DNA ligase, wBm-LigA) proteins and investigated the immune responses, which they triggered in animal models. The current study emphasizes on immunological characteristics of these proteins in three major categories of filarial endemic zones: endemic normal (EN, asymptomatic, amicrofilaraemic; putatively immune), microfilariae carriers (MF, asymptomatic but microfilaraemic), and chronic filarial patients (CP, symptomatic and mostly amicrofilaraemic). METHODS Immunoblotting and ELISA were carried out to measure IgG and isotype antibodies against these recombinant proteins in various clinical categories. Involvement of serum antibodies in infective larvae killing was assessed by antibody-dependent cellular adhesion and cytotoxicity assay. Cellular immune response was investigated by in vitro proliferation of peripheral blood mononuclear cells (PBMCs) and reactive oxygen species (ROS) generation in these cells after stimulation. RESULTS Immune responses of EN and CP displayed almost similar level of IgG to Wol Tl IF-1 while other three proteins had higher serum IgG in EN individuals only. Specific IgA, IgG1, IgG3 and IgM to Bm-TPP were high in EN subjects, while BmAF-Myo additionally showed elevated IgG2. Enhanced IgA and IgG3 were detected in both EN and CP individuals in response to Wol Tl IF-1 antigen, but IgG1 and IgM were high only in EN individuals. wBm-LigA and BmAF-Myo exhibited almost similar pattern of antibody responses. PBMC isolated from EN subjects exhibited higher proliferation and ROS generation when stimulated with all three proteins except for Wol Tl IF-1. CONCLUSIONS Overall, these findings display high immunogenicity of all four proteins in human subjects and revealed that the EN population was exposed to both B. malayi and Wolbachia proteins simultaneously. In addition, immune responses to Wol Tl IF-1 suggest possible role of this factor in Wolbachia-induced pathological responses while immune responses to other three proteins suggest that these can be explored further as vaccine candidates.
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Affiliation(s)
- Ruchi Jha
- Division of Parasitology, CSIR-Central Drug Research Institute, BS 10/1, Sector 10 Jankipuram Extension, Sitapur Road, Lucknow, UP, 226031, India
| | - Mamta Gangwar
- Division of Parasitology, CSIR-Central Drug Research Institute, BS 10/1, Sector 10 Jankipuram Extension, Sitapur Road, Lucknow, UP, 226031, India
| | - Dhanvantri Chahar
- Division of Parasitology, CSIR-Central Drug Research Institute, BS 10/1, Sector 10 Jankipuram Extension, Sitapur Road, Lucknow, UP, 226031, India.,Academy of Scientific and Innovative Research, New Delhi, India
| | - Anand Setty Balakrishnan
- Department of Genetic Engineering, School of Biotechnology, Madurai Kamraj University, Palkalai Nagar, Madurai, TN, 625021, India
| | - Mahendra Pal Singh Negi
- Biometry and Statistics Division, CSIR-Central Drug Research Institute, BS 10/1, Sector 10 Jankipuram Extension, Sitapur Road, Lucknow, UP, 226031, India
| | - Shailja Misra-Bhattacharya
- Division of Parasitology, CSIR-Central Drug Research Institute, BS 10/1, Sector 10 Jankipuram Extension, Sitapur Road, Lucknow, UP, 226031, India. .,Academy of Scientific and Innovative Research, New Delhi, India.
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64
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Díaz A, Casaravilla C, Barrios AA, Ferreira AM. Parasite molecules and host responses in cystic echinococcosis. Parasite Immunol 2016; 38:193-205. [PMID: 26425838 DOI: 10.1111/pim.12282] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 09/22/2015] [Indexed: 01/03/2023]
Abstract
Cystic echinococcosis is the infection by the larvae of cestode parasites belonging to the Echinococcus granulosus sensu lato species complex. Local host responses are strikingly subdued in relation to the size and persistence of these larvae, which develop within mammalian organs as 'hydatid cysts' measuring up to tens of cm in diameter. In a context in which helminth-derived immune-suppressive, as well as Th2-inducing, molecules garner much interest, knowledge on the interactions between E. granulosus molecules and the immune system lags behind. Here, we discuss what is known and what are the open questions on E. granulosus molecules and structures interacting with the innate and adaptive immune systems, potentially or in demonstrated form. We attempt a global biological approach on molecules that have been given consideration primarily as protective (Eg95) or diagnostic antigens (antigen B, antigen 5). We integrate glycobiological information, which traverses the discussions on antigen 5, the mucin-based protective laminated layer and immunologically active preparations from protoscoleces. We also highlight some less well-known molecules that appear as promising candidates to possess immune-regulatory activities. Finally, we point out gaps in the molecular-level knowledge of this infectious agent that hinder our understanding of its immunology.
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Affiliation(s)
- A Díaz
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| | - C Casaravilla
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| | - A A Barrios
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
| | - A M Ferreira
- Cátedra de Inmunología, Departamento de Biociencias (Facultad de Química) and Instituto de Química Biológica (Facultad de Ciencias), Universidad de la República, Montevideo, Uruguay
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65
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Trichinella spiralis infection and transplacental passage in human pregnancy. Vet Parasitol 2016; 231:2-7. [DOI: 10.1016/j.vetpar.2016.06.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 06/04/2016] [Accepted: 06/11/2016] [Indexed: 11/21/2022]
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66
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Increased IgG antibody responses to excretory/secretory antigens in neonates born from mothers infected with filarial nematodes. J Helminthol 2016; 91:752-756. [PMID: 27790964 DOI: 10.1017/s0022149x16000778] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present investigation aimed to evaluate the extent to which maternal filarial infection influences IgG subclass immune responses in the cord blood of neonates. Prevalence of antigenaemia was detected using an Og4C3 assay. Filaria-specific IgG subclasses against excretory/secretory antigens were measured by ELISA. Transplacental transfer of circulating filarial antigen (CFA) was observed from 34.8% of CFA-positive mothers to their respective cord bloods. Filaria-specific IgG1, IgG2 and IgG4 responses were significantly higher among cord bloods of infected mothers compared to cord bloods of uninfected mothers. In contrast, the IgG3 response was significantly higher among cord bloods of uninfected mothers. The study shows that transplacental transfer of filarial antigens and filaria-specific IgG4 occurs more in mothers having high worm burdens, and transfer of filaria-specific IgG3 occurs more in the cord blood of uninfected mothers. The findings of the study provide evidence for the development of prenatal sensitization to filarial antigens in utero, and high filaria-specific IgG4 in cord blood may serve as a marker for in-utero sensitization.
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67
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Londono-Renteria B, Cardenas JC, Troupin A, Colpitts TM. Natural Mosquito-Pathogen Hybrid IgG4 Antibodies in Vector-Borne Diseases: A Hypothesis. Front Immunol 2016; 7:380. [PMID: 27746778 PMCID: PMC5040711 DOI: 10.3389/fimmu.2016.00380] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 09/08/2016] [Indexed: 12/24/2022] Open
Abstract
Chronic exposure to antigens may favor the production of IgG4 antibodies over other antibody types. Recent studies have shown that up to a 30% of normal human IgG4 is bi-specific and is able to recognize two antigens of different nature. A requirement for this specificity is the presence of both eliciting antigens in the same time and at the same place where the immune response is induced. During transmission of most vector-borne diseases, the pathogen is delivered to the vertebrate host along with the arthropod saliva during blood feeding and previous studies have shown the existence of IgG4 antibodies against mosquito salivary allergens. However, there is very little ongoing research or information available regarding IgG4 bi-specificity with regard to infectious disease, particularly during immune responses to vector-borne diseases, such as malaria, filariasis, or dengue virus infection. Here, we provide background information and present our hypothesis that IgG4 may not only be a useful tool to measure exposure to infected mosquito bites, but that these bi-specific antibodies may also play an important role in modulation of the immune response against malaria and other vector-borne diseases in endemic settings.
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Affiliation(s)
- Berlin Londono-Renteria
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine , Columbia, SC , USA
| | - Jenny C Cardenas
- Clinical Laboratory, Hospital Los Patios , Los Patios , Colombia
| | - Andrea Troupin
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine , Columbia, SC , USA
| | - Tonya M Colpitts
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine , Columbia, SC , USA
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68
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Therapeutic potential of the immunomodulatory proteins Wuchereria bancrofti L2 and Brugia malayi abundant larval transcript 2 against streptozotocin-induced type 1 diabetes in mice. J Helminthol 2016; 91:539-548. [DOI: 10.1017/s0022149x1600064x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractEpidemiological and experimental evidence has supported the concept of using helminths as alternative bio-therapeutic agents in the treatment of type 1 diabetes (T1D). In the current study, two filarial proteins, recombinant Wuchereria bancrofti L2 (rWbL2) and Brugia malayi abundant larval transcript 2 (rBmALT-2) have been investigated, individually and in combination, for their therapeutic potential in streptozotocin (STZ)-induced T1D. The rWbL2 and rBmALT-2 proteins, when administered individually or in combination, have resulted in lowering of the blood glucose levels and reducing the incidence of T1D in mice. In addition, these proteins have led to reduced lymphocytic infiltration and decreased islet damage and inflammation. The curative effect was found to be associated with the suppression of release of tumour necrosis factor-α (TNF-α) and interferon-γ (IFN-γ), and increased production of interleukin (IL)-4, IL-5 and IL-10 cytokines by the splenocytes of the diabetic mice. Insulin-specific IgG1 and antigen-specific IgE antibodies were found to be elevated in the sera of mice treated with rWbL2 and rBmALT-2 proteins. From the findings in this study, it can be envisaged that both of these filarial immunomodulatory proteins have the potential to ameliorate T1D by altering the regulatory immune responses.
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69
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Shin SH, Hsu A, Chastain HM, Cruz LA, Elder ES, Sapp SGH, McAuliffe I, Espino AM, Handali S. Development of Two FhSAP2 Recombinant-Based Assays for Immunodiagnosis of Human Chronic Fascioliasis. Am J Trop Med Hyg 2016; 95:852-855. [PMID: 27549636 DOI: 10.4269/ajtmh.16-0253] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 07/05/2016] [Indexed: 02/04/2023] Open
Abstract
In the United States, infection with Fasciola hepatica has been identified as an emerging disease, primarily in immigrants, refugees, and travelers. The laboratory test of choice for diagnosis of fascioliasis is detection of disease specific antibodies, most commonly uses excretory-secretory antigens for detection of IgG antibodies. Recently, recombinant proteins such as F. hepatica antigen (FhSAP2) have been used to detect IgG antibodies. The glutathione S-transferase (GST)-FhSAP2 recombinant antigen was used to develop Western blot (WB) and fluorescent bead-based (Luminex) assays to detect F. hepatica total IgG and IgG4 antibodies. The sensitivity and specificity of GST-FhSAP2 total IgG and IgG4 WB were similar at 94% and 98%, respectively. For the IgG Luminex assay, the sensitivity and specificity were 94% and 97%, and for the IgG4, the values were 100% and 99%, respectively. In conclusion, the GST-FhSAP2 antigen performs well in several assay formats and can be used for clinical diagnosis.
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Affiliation(s)
- Sun Hee Shin
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Angel Hsu
- Emory College, Emory University, Atlanta, Georgia
| | - Holly M Chastain
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Lorna A Cruz
- Laboratory of Immunology and Molecular Parasitology, Department of Microbiology, School of Medicine, University of Puerto Rico, San Juan, Puerto Rico
| | - Eric S Elder
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | | | - Isabel McAuliffe
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Ana M Espino
- Laboratory of Immunology and Molecular Parasitology, Department of Microbiology, School of Medicine, University of Puerto Rico, San Juan, Puerto Rico
| | - Sukwan Handali
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia.
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Rodrigo MB, Schulz S, Krupp V, Ritter M, Wiszniewsky K, Arndts K, Tamadaho RSE, Endl E, Hoerauf A, Layland LE. Patency of Litomosoides sigmodontis infection depends on Toll-like receptor 4 whereas Toll-like receptor 2 signalling influences filarial-specific CD4(+) T-cell responses. Immunology 2016; 147:429-42. [PMID: 26714796 DOI: 10.1111/imm.12573] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 12/18/2015] [Accepted: 12/21/2015] [Indexed: 12/14/2022] Open
Abstract
BALB/c mice develop a patent state [release of microfilariae (Mf), the transmission life-stage, into the periphery] when exposed to the rodent filariae Litomosoides sigmodontis. Interestingly, only a portion of the infected mice become patent, which reflects the situation in human individuals infected with Wuchereria bancrofti. Since those individuals had differing filarial-specific profiles, this study compared differences in immune responses between Mf(+) and Mf(-) infected BALB/c mice. We demonstrate that cultures of total spleen or mediastinal lymph node cells from Mf(+) mice produce significantly more interleukin-5 (IL-5) to filarial antigens but equal levels of IL-10 when compared with Mf(-) mice. However, isolated CD4(+) T cells from Mf(+) mice produced significantly higher amounts of all measured cytokines, including IL-10, when compared with CD4(+) T-cell responses from Mf(-) mice. Since adaptive immune responses are influenced by triggering the innate immune system we further studied the immune profiles and parasitology in infected Toll-like receptor-2-deficient (TLR2(-/-)) and TLR4(-/-) BALB/c mice. Ninety-three per cent of L. sigmodontis-exposed TLR4(-/-) BALB/c mice became patent (Mf(+)) although worm numbers remained comparable to those in Mf(+) wild-type controls. Lack of TLR2 had no influence on patency outcome or worm burden but infected Mf(+) mice had significantly lower numbers of Foxp3(+) regulatory T cells and dampened peripheral immune responses. Interestingly, in vitro culturing of CD4(+) T cells from infected wild-type mice with granulocyte-macrophage colony-stimulating factor-derived TLR2(-/-) dendritic cells resulted in an overall diminished cytokine profile to filarial antigens. Hence, triggering TLR4 or TLR2 during chronic filarial infection has a significant impact on patency and efficient CD4(+) T-cell responses, respectively.
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Affiliation(s)
- Maria B Rodrigo
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Sandy Schulz
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Vanessa Krupp
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Manuel Ritter
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Katharina Wiszniewsky
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Kathrin Arndts
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Ruth S E Tamadaho
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Elmar Endl
- Institute for Molecular Medicine, University Hospital of Bonn, Bonn, Germany
| | - Achim Hoerauf
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany.,German Centre for Infection Research (DZIF), Partner Site, Bonn-Cologne, Bonn, Germany
| | - Laura E Layland
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany.,German Centre for Infection Research (DZIF), Partner Site, Bonn-Cologne, Bonn, Germany
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71
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Kwarteng A, Ahuno ST. The Potentials and Pitfalls of Microarrays in Neglected Tropical Diseases: A Focus on Human Filarial Infections. MICROARRAYS 2016; 5:microarrays5030020. [PMID: 27600086 PMCID: PMC5040967 DOI: 10.3390/microarrays5030020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 06/01/2016] [Accepted: 06/28/2016] [Indexed: 12/01/2022]
Abstract
Data obtained from expression microarrays enables deeper understanding of the molecular signatures of infectious diseases. It provides rapid and accurate information on how infections affect the clustering of gene expression profiles, pathways and networks that are transcriptionally active during various infection states compared to conventional diagnostic methods, which primarily focus on single genes or proteins. Thus, microarray technologies offer advantages in understanding host-parasite interactions associated with filarial infections. More importantly, the use of these technologies can aid diagnostics and helps translate current genomic research into effective treatment and interventions for filarial infections. Studying immune responses via microarray following infection can yield insight into genetic pathways and networks that can have a profound influence on the development of anti-parasitic vaccines.
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Affiliation(s)
- Alexander Kwarteng
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Private Mail Bag, Kwame Nkrumah University Science & Technology, KNUST, Kumasi 233, Ghana.
- Department of Biochemistry and Biotechnology, Kwame Nkrumah University Science & Technology, KNUST, Kumasi 233, Ghana.
| | - Samuel Terkper Ahuno
- Department of Biochemistry and Biotechnology, Kwame Nkrumah University Science & Technology, KNUST, Kumasi 233, Ghana.
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Doenhoff MJ, El-Faham M, Liddell S, Fuller HR, Stanley RG, Schramm G, Igetei JE. Cross-Reactivity between Schistosoma mansoni Antigens and the Latex Allergen Hev b 7: Putative Implication of Cross-Reactive Carbohydrate Determinants (CCDs). PLoS One 2016; 11:e0159542. [PMID: 27467385 PMCID: PMC4965158 DOI: 10.1371/journal.pone.0159542] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 07/04/2016] [Indexed: 01/30/2023] Open
Abstract
IgG antibodies produced by rabbits immunized against S. mansoni antigens cross-reacted with aqueous soluble constituents of a variety of allergens. The antibody cross-reactivity was largely sensitive to degradation by treatment of the target antigens with sodium meta-periodate, suggesting the cross-reactivity was due to carbohydrate determinants that were common to both the schistosome and the allergens (CCDs). The reaction between the rabbit antibodies and a 43 kDa molecule in a rubber latex extract was analysed further: tandem mass spectrometry identified the latex molecule as allergen Hev b 7. Rabbit anti-schistosome IgG antibodies purified by acid-elution from solid-phase latex Hev b 7 reacted with the S. mansoni egg antigens IPSE/alpha-1 and kappa-5 and cercarial antigens SPO-1 and a fatty acid-binding protein. Moreover, purified anti-S. mansoni egg, latex cross-reactive antibodies reacted with antigenic constituents of some fruits, a result of potential relevance to the latex-fruit syndrome of allergic reactions. We propose that IgG anti-schistosome antibodies that cross-react with allergens may be able to block IgE-induced allergic reactions and thus provide a possible explanation for the hygiene hypothesis.
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Affiliation(s)
- Michael J. Doenhoff
- School of Life Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
- * E-mail:
| | - Marwa El-Faham
- School of Life Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
- Department of Medical Parasitology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Susan Liddell
- School of Biosciences, Sutton Bonington Campus, University of Nottingham, Nottingham, LE12 5RD, United Kingdom
| | - Heidi R. Fuller
- School of Biological Sciences, University of Wales, Bangor, Gwynedd, LL57 2UW, United Kingdom
| | - Ronald G. Stanley
- School of Biological Sciences, University of Wales, Bangor, Gwynedd, LL57 2UW, United Kingdom
| | - Gabriele Schramm
- Research Center Borstel, Priority Area Asthma and Allergy, Experimental Pneumology, Parkallee 22, D-23845, Borstel, Germany
| | - Joseph E. Igetei
- School of Life Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
- Department of Animal and Environmental Biology, Faculty of Life Sciences, University of Benin, Benin City, Edo State, Nigeria
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Elfaki TEM, Arndts K, Wiszniewsky A, Ritter M, Goreish IA, Atti El Mekki MEYA, Arriens S, Pfarr K, Fimmers R, Doenhoff M, Hoerauf A, Layland LE. Multivariable Regression Analysis in Schistosoma mansoni-Infected Individuals in the Sudan Reveals Unique Immunoepidemiological Profiles in Uninfected, egg+ and Non-egg+ Infected Individuals. PLoS Negl Trop Dis 2016; 10:e0004629. [PMID: 27152725 PMCID: PMC4859533 DOI: 10.1371/journal.pntd.0004629] [Citation(s) in RCA: 8] [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: 05/13/2015] [Accepted: 03/24/2016] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND In the Sudan, Schistosoma mansoni infections are a major cause of morbidity in school-aged children and infection rates are associated with available clean water sources. During infection, immune responses pass through a Th1 followed by Th2 and Treg phases and patterns can relate to different stages of infection or immunity. METHODOLOGY This retrospective study evaluated immunoepidemiological aspects in 234 individuals (range 4-85 years old) from Kassala and Khartoum states in 2011. Systemic immune profiles (cytokines and immunoglobulins) and epidemiological parameters were surveyed in n = 110 persons presenting patent S. mansoni infections (egg+), n = 63 individuals positive for S. mansoni via PCR in sera but egg negative (SmPCR+) and n = 61 people who were infection-free (Sm uninf). Immunoepidemiological findings were further investigated using two binary multivariable regression analysis. PRINCIPAL FINDINGS Nearly all egg+ individuals had no access to latrines and over 90% obtained water via the canal stemming from the Atbara River. With regards to age, infection and an egg+ status was linked to young and adolescent groups. In terms of immunology, S. mansoni infection per se was strongly associated with increased SEA-specific IgG4 but not IgE levels. IL-6, IL-13 and IL-10 were significantly elevated in patently-infected individuals and positively correlated with egg load. In contrast, IL-2 and IL-1β were significantly lower in SmPCR+ individuals when compared to Sm uninf and egg+ groups which was further confirmed during multivariate regression analysis. CONCLUSIONS/SIGNIFICANCE Schistosomiasis remains an important public health problem in the Sudan with a high number of patent individuals. In addition, SmPCR diagnostics revealed another cohort of infected individuals with a unique immunological profile and provides an avenue for future studies on non-patent infection states. Future studies should investigate the downstream signalling pathways/mechanisms of IL-2 and IL-1β as potential diagnostic markers in order to distinguish patent from non-patent individuals.
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Affiliation(s)
- Tayseer Elamin Mohamed Elfaki
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
- Department of Parasitology and Immunology, College of Medical Laboratory Science, Sudan University of Science and Technology, Khartoum, Sudan
| | - Kathrin Arndts
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Anna Wiszniewsky
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Manuel Ritter
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Ibtisam A. Goreish
- Animal Resources Research Corporation, Ministry of Livestock, Fisheries and Rangelands, Khartoum, Sudan
| | - Misk El Yemen A. Atti El Mekki
- Department of Parasitology and Immunology, College of Medical Laboratory Science, Sudan University of Science and Technology, Khartoum, Sudan
| | - Sandra Arriens
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Kenneth Pfarr
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
| | - Rolf Fimmers
- Institute of Medical Biometry, Informatics and Epidemiology (IMBIE), University Hospital of Bonn, Bonn, Germany
| | - Mike Doenhoff
- School of Biology, University of Nottingham, Nottingham, United Kingdom
| | - Achim Hoerauf
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
- German Centre for Infection Research (DZIF), partner site, Bonn-Cologne, Bonn, Germany
| | - Laura E. Layland
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital of Bonn, Bonn, Germany
- German Centre for Infection Research (DZIF), partner site, Bonn-Cologne, Bonn, Germany
- * E-mail:
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Kolkhir P, Balakirski G, Merk HF, Olisova O, Maurer M. Chronic spontaneous urticaria and internal parasites--a systematic review. Allergy 2016; 71:308-22. [PMID: 26648083 DOI: 10.1111/all.12818] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/29/2015] [Indexed: 01/09/2023]
Abstract
Chronic spontaneous urticaria (CSU) is defined as persistent wheals, angioedema, or both lasting for >6 weeks due to known or unknown causes. Some epidemiological studies and case reports suggest that internal parasite infections (PI) can cause CSU. Here, we provide a systematic overview of published findings on the prevalence and relevance of PI in CSU and we discuss possible pathomechanisms. The prevalence of PI in CSU was investigated by 39 independent studies and comorbidity reportedly ranged from 0 to 75.4% (two-thirds of these studies reported infection rates of 10% or less). The prevalence of PI in adult and pediatric CSU patients ranged from 0% to 75.4% and from 0% to 37.8%, respectively. CSU patients were more often diagnosed with protozoa and had a significantly higher risk of toxocariasis seropositivity and Anisakis simplex sensitization when compared to healthy controls. Patients with chronic urticaria more frequently had seropositivity of fasciolosis, Anisakis simplex sensitization, and the presence of Blastocystis hominis allele 34 (ST3) as compared with control subjects. In 21 studies, efficacy of treatment with antiparasitic drugs ranged from 0 to 100% (35.7% of 269 CSU patients benefitted). In 9 (42.8%) of 21 studies, more than 50% of efficacy was observed. The reported rate of urticaria comorbidity in PI patients in 18 independent studies is 1-66.7%. Urticaria including CSU might be a quite common symptom of strongyloidiasis and blastocystosis. Pathogenic mechanisms in CSU due to PI may include specific IgE, Th2 cytokine skewing, eosinophils, activation of the complement, and the coagulation systems.
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Affiliation(s)
- P. Kolkhir
- Department of Dermatology and Venereology; Sechenov First Moscow State Medical University; Moscow Russia
| | - G. Balakirski
- Department of Dermatology and Allergology; University Hospital of Aachen; Aachen Germany
| | - H. F. Merk
- Department of Dermatology and Allergology; University Hospital of Aachen; Aachen Germany
| | - O. Olisova
- Department of Dermatology and Venereology; Sechenov First Moscow State Medical University; Moscow Russia
| | - M. Maurer
- Department of Dermatology and Allergy; Charité-Universitätsmedizin Berlin; Berlin Germany
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Mourglia-Ettlin G, Miles S, Hernández A, Dematteis S. Antibody profiling in ultrasound normal individuals with positive serology for cystic echinococcosis. Parasite Immunol 2016; 38:93-100. [DOI: 10.1111/pim.12302] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 12/23/2015] [Indexed: 12/24/2022]
Affiliation(s)
- G. Mourglia-Ettlin
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| | - S. Miles
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| | - A. Hernández
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
| | - S. Dematteis
- Facultad de Química/Facultad de Ciencias; Cátedra de Inmunología - DEPBIO/IQB; Universidad de la República; Montevideo Uruguay
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76
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Sarkar A, Pitchumoni CS. The protean manifestations of IgG4-RD in gastrointestinal disorders. Dis Mon 2015; 61:493-515. [DOI: 10.1016/j.disamonth.2015.09.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Boyd A, Killoran K, Mitre E, Nutman TB. Pleural cavity type 2 innate lymphoid cells precede Th2 expansion in murine Litomosoides sigmodontis infection. Exp Parasitol 2015; 159:118-26. [PMID: 26394284 DOI: 10.1016/j.exppara.2015.09.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 08/19/2015] [Accepted: 09/16/2015] [Indexed: 01/21/2023]
Abstract
Recently, a family of innate cells has been identified that respond to IL-25 and IL-33 in murine intestinal helminths. Termed Type 2 innate lymphoid cells (ILC2s) they facilitate the development of Th2 responses responsible for helminth clearance. We evaluated these cells in a tissue-invasive helminth model. Using Litomosides sigmodontis (a strong Th2 polarizing filarial infection) we observed a robust Th2 response in the pleural cavity, where adult worms reside, marked by increased levels of IL-5 and IL-13 in infected mice. In parallel, ILC2s were expanded in the pleural cavity early in the infection, peaking during the pre-patent period. L. sigmodontis also elicits a strong systemic Th2 response, which includes significantly increased levels of IgG1, IgE and IL-5 in the plasma of infected mice. Although ILC2s were expanded locally, they were not expanded in the spleen, blood, or mediastinal lymph nodes in response to L. sigmodontis infection, suggesting that ILC2s function primarily at the site of infection. The increase in ILC2s in the pleural cavity and the expansion in Th2 responses indicates a probable role for these cells in initiating and maintaining the Th2 response and highlights the importance of these cells in helminth infections and their role in Th2 immunity.
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Affiliation(s)
- Alexis Boyd
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA
| | - Kristin Killoran
- Department of Microbiology and Immunology, F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Rd, Bethesda, MD 20892, USA
| | - Edward Mitre
- Department of Microbiology and Immunology, F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Rd, Bethesda, MD 20892, USA
| | - Thomas B Nutman
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
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Renand A, Archila LD, McGinty J, Wambre E, Robinson D, Hales BJ, Thomas WR, Kwok WW. Chronic cat allergen exposure induces a TH2 cell-dependent IgG4 response related to low sensitization. J Allergy Clin Immunol 2015; 136:1627-1635.e13. [PMID: 26371841 DOI: 10.1016/j.jaci.2015.07.031] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 06/15/2015] [Accepted: 07/17/2015] [Indexed: 01/13/2023]
Abstract
BACKGROUND In human subjects, allergen tolerance has been observed after high-dose allergen exposure or after completed allergen immunotherapy, which is related to the accumulation of anti-inflammatory IgG4. However, the specific T-cell response that leads to IgG4 induction during chronic allergen exposure remains poorly understood. OBJECTIVE We sought to evaluate the relationship between cat allergen-specific T-cell frequency, cat allergen-specific IgE and IgG4 titers, and clinical status in adults with cat allergy with and without cat ownership and the cellular mechanism by which IgG4 is produced. METHODS Fel d 1-, Fel d 4-, Fel d 7-, and Fel d 8-specific T-cell responses were characterized by CD154 expression after antigen stimulation. RESULTS In allergic subjects without cat ownership, the frequency of cat allergen (Fel d 1 and Fel d 4)-specific TH2 (sTH2) cells correlates with higher IgE levels and is linked to asthma. Paradoxically, we observed that subjects with cat allergy and chronic cat exposure maintain a high frequency of sTH2 cells, which correlates with higher IgG4 levels and low sensitization. B cells from allergic, but not nonallergic subjects, are able to produce IgG4 after cognate interactions with sTH2 clones and Fel d 1 peptide or the Fel d 1 recombinant protein. CONCLUSION These experiments suggest that (1) allergen-experienced B cells with the capacity to produce IgG4 are present in allergic subjects and (2) cat allergen exposure induces an IgG4 response in a TH2 cell-dependent manner. Thus IgG4 accumulation could be mediated by chronic activation of the TH2 response, which in turn drives desensitization.
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Affiliation(s)
- Amedee Renand
- Benaroya Research Institute at Virginia Mason, Seattle, Wash
| | - Luis D Archila
- Benaroya Research Institute at Virginia Mason, Seattle, Wash
| | - John McGinty
- Benaroya Research Institute at Virginia Mason, Seattle, Wash
| | - Erik Wambre
- Benaroya Research Institute at Virginia Mason, Seattle, Wash
| | - David Robinson
- the Asthma and Allergy Department, Virginia Mason Medical Center, Seattle, Wash
| | - Belinda J Hales
- Telethon Kids Institute, University of Western Australia, Subiaco, Australia
| | - Wayne R Thomas
- Telethon Kids Institute, University of Western Australia, Subiaco, Australia
| | - William W Kwok
- Benaroya Research Institute at Virginia Mason, Seattle, Wash; Department of Medicine, University of Washington, Seattle, Wash.
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Development of Ss-NIE-1 recombinant antigen based assays for immunodiagnosis of strongyloidiasis. PLoS Negl Trop Dis 2015; 9:e0003694. [PMID: 25860665 PMCID: PMC4393093 DOI: 10.1371/journal.pntd.0003694] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 03/10/2015] [Indexed: 11/30/2022] Open
Abstract
Strongyloides stercoralis is a widely distributed parasite that infects 30 to 100 million people worldwide. In the United States strongyloidiasis is recognized as an important infection in immigrants and refugees. Public health and commercial reference laboratories need a simple and reliable method for diagnosis of strongyloidiasis to identify and treat cases and to prevent transmission. The recognized laboratory test of choice for diagnosis of strongyloidiasis is detection of disease specific antibodies, most commonly using a crude parasite extract for detection of IgG antibodies. Recently, a luciferase tagged recombinant protein of S. stercoralis, Ss-NIE-1, has been used in a luciferase immunoprecipitation system (LIPS) to detect IgG and IgG4 specific antibodies. To promote wider adoption of immunoassays for strongyloidiasis, we used the Ss-NIE-1 recombinant antigen without the luciferase tag and developed ELISA and fluorescent bead (Luminex) assays to detect S. stercoralis specific IgG4. We evaluated the assays using well-characterized sera from persons with or without presumed strongyloidiasis. The sensitivity and specificity of Ss-NIE-1 IgG4 ELISA were 95% and 93%, respectively. For the IgG4 Luminex assay, the sensitivity and specificity were 93% and 95%, respectively. Specific IgG4 antibody decreased after treatment in a manner that was similar to the decrease of specific IgG measured in the crude IgG ELISA. The sensitivities of the Ss-NIE-1 IgG4 ELISA and Luminex assays were comparable to the crude IgG ELISA but with improved specificities. However, the Ss-NIE-1 based assays are not dependent on native parasite materials and can be performed using widely available laboratory equipment. In conclusion, these newly developed Ss-NIE-1 based immunoassays can be readily adopted by public health and commercial reference laboratories for routine screening and clinical diagnosis of S. stercoralis infection in refugees and immigrants in the United States. Strongyloidiasis is a neglected tropical disease that affects millions worldwide and needs more attention and better diagnostic methods. Strongyloides stercoralis can undergo an autoinfection cycle and can cause hyperinfection involving the pulmonary and gastrointestinal systems and disseminated infection in other organs. Although endemic areas are mostly developing countries in tropical and subtropical regions with only sporadic transmission in temperate areas, the disease is a threat to developed world populations through immigrants, refugees, travelers, and military personnel. The disease can have catastrophic effects when a patient is immunocompromised or when an infected organ is transplanted into a vulnerable recipient. Due to the threat to public health, the intricate life cycle of S. stercoralis, the need to perform multiple follow-up diagnostics to ensure treatment success, and the necessity to rule out multiple co-endemic parasitic infections, it is imperative to develop new diagnostic assays that are simple and efficient while retaining maximal sensitivity and specificity. In this study, we use a well-known recombinant protein, Ss-NIE-1, to optimize assays using both an ELISA format and a multiplex platform to meet these needs.
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80
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Arndts K, Klarmann-Schulz U, Batsa L, Debrah AY, Epp C, Fimmers R, Specht S, Layland LE, Hoerauf A. Reductions in microfilaridermia by repeated ivermectin treatment are associated with lower Plasmodium-specific Th17 immune responses in Onchocerca volvulus-infected individuals. Parasit Vectors 2015; 8:184. [PMID: 25889652 PMCID: PMC4391604 DOI: 10.1186/s13071-015-0786-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 03/05/2015] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND 37 million individuals are currently infected with Onchocerca volvulus (O. volvulus), a parasitic nematode that elicits various dermal manifestations and eye damage in man. Disease control is primarily based on distributing ivermectin in mass drug administration (MDA) programmes which aim at breaking transmission by eliminating microfilariae (MF), the worm's offspring. The majority of infected individuals present generalized onchocerciasis, which is characterized by hyporesponsive immune responses and high parasite burden including MF. Recently, in areas that have been part of MDA programmes, individuals have been identified that present nodules but are amicrofilaridermic (a-MF) and our previous study showed that this group has a distinct immune profile. Expanding on those findings we determined the immune responses of O. volvulus-infected individuals to a Plasmodium-derived antigen MSP-1 (merozoite surface protein-1), which is required by the parasite to enter erythrocytes. METHODS Isolated PBMCs from O. volvulus-infected individuals (164 MF(+) and 46 a-MF) and non-infected volunteers from the same region (NEN), were stimulated with MSP-1 and the resulting supernatant screened for the presence of IL-5, IL-13, IFN-γ, TNF-α, IL-6, IL-17A and IL-10. These findings were then further analyzed following regression analysis using the covariates MF, ivermectin (IVM) and region. The latter referred to the Central or Ashanti regions of Ghana, which, at the time sampling, had received 8 or 1 round of MDA respectively. RESULTS IL-5, IL-13 and IFN-γ responses to MSP-1 were not altered between NEN and O. volvulus-infected individuals nor were any associations revealed in the regression analysis. IL-10, IL-6 and TNF-α MSP-1 responses were, however, significantly elevated in cultures from infected individuals. Interestingly, when compared to a-MF individuals, MSP-induced IL-17A responses were significantly higher in MF(+) patients. Following multivariable regression analysis these IL-10, IL-6, TNF-α and IL-17A responses were all dominantly associated with the regional covariate. CONCLUSIONS Consequently, areas with a lowered infection pressure due to IVM MDA appear to influence bystander responses to Plasmodium-derived antigens in community members even if they have not regularly participated in the therapy.
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Affiliation(s)
- Kathrin Arndts
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Sigmund Freud Straße 25, Bonn, 53105, Germany.
| | - Ute Klarmann-Schulz
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Sigmund Freud Straße 25, Bonn, 53105, Germany.
- Institute of Medical Biometry, Informatics and Epidemiology (IMBIE), University Hospital Bonn, Bonn, Germany.
| | - Linda Batsa
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kumasi, Ghana.
| | - Alexander Y Debrah
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kumasi, Ghana.
- Faculty of Allied Health Sciences of the Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
| | - Christian Epp
- Centre for Infectious Diseases - Parasitology, University Hospital Heidelberg, Heidelberg, Germany.
| | - Rolf Fimmers
- Institute of Medical Biometry, Informatics and Epidemiology (IMBIE), University Hospital Bonn, Bonn, Germany.
| | - Sabine Specht
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Sigmund Freud Straße 25, Bonn, 53105, Germany.
| | - Laura E Layland
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Sigmund Freud Straße 25, Bonn, 53105, Germany.
| | - Achim Hoerauf
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Sigmund Freud Straße 25, Bonn, 53105, Germany.
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81
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Hyperreactive onchocerciasis is characterized by a combination of Th17-Th2 immune responses and reduced regulatory T cells. PLoS Negl Trop Dis 2015; 9:e3414. [PMID: 25569210 PMCID: PMC4288720 DOI: 10.1371/journal.pntd.0003414] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 11/12/2014] [Indexed: 01/08/2023] Open
Abstract
Clinical manifestations in onchocerciasis range from generalized onchocerciasis (GEO) to the rare but severe hyperreactive (HO)/sowda form. Since disease pathogenesis is associated with host inflammatory reactions, we investigated whether Th17 responses could be related to aggravated pathology in HO. Using flow cytometry, filarial-specific cytokine responses and PCR arrays, we compared the immune cell profiles, including Th subsets, in individuals presenting the two polar forms of infection and endemic normals (EN). In addition to elevated frequencies of memory CD4+ T cells, individuals with HO showed accentuated Th17 and Th2 profiles but decreased CD4+CD25hiFoxp3+ regulatory T cells. These profiles included increased IL-17A+, IL-4+, RORC2+ and GATA3+CD4+ T cell populations. Flow cytometry data was further confirmed using a PCR array since Th17-related genes (IL-17 family members, IL-6, IL-1β and IL-22) and Th2-related (IL-4, IL-13, STAT6) genes were all significantly up-regulated in HO individuals. In addition, stronger Onchocerca volvulus-specific Th2 responses, especially IL-13, were observed in vitro in hyperreactive individuals when compared to GEO or EN groups. This study provides initial evidence that elevated frequencies of Th17 and Th2 cells form part of the immune network instigating the development of severe onchocerciasis. Onchocerciasis, also known as river blindness is a tropical disease causing health and socioeconomic problems in endemic communities especially sub-Saharan Africa. The disease is transmitted by a filarial nematode called Onchocerca volvulus, which is spread by the bite of infected Simulium black flies. Characteristic disease symptoms include dermatological disorders and eye lesions that can lead to blindness. Two polar forms of clinical manifestations can occur: generalized onchocerciasis (GEO) presenting mild skin disease or the hyperreactive form (HO) exhibiting severe skin disorders and inflammation. The immunological determinants behind such disease polarization are still not fully clarified. Here, we compared the immune profiles of individuals presenting these two polar forms with those of endemic normals (EN): individuals who have no clinical or parasitological evidence of infection despite ongoing exposure to the infectious agent. We could show that HO individuals, in contrast to GEO and EN, simultaneously presented elevated Th17 and Th2 profiles which were accompanied by reduced numbers of Foxp3+ regulatory T cells. This study provides initial evidence that elevated frequencies of Th17 and Th2 cells form part of the immune network associated with severe onchocerciasis.
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Achary KG, Mandal NN, Mishra S, Mishra R, Sarangi SS, Satapathy AK, Kar SK, Bal MS. In utero sensitization modulates IgG isotype, IFN-γ and IL-10 responses of neonates in bancroftian filariasis. Parasite Immunol 2014; 36:485-93. [PMID: 24902619 DOI: 10.1111/pim.12121] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 05/31/2014] [Indexed: 11/26/2022]
Abstract
In utero exposure has been considered as a risk factor for filarial infection. To evaluate the influence of maternal infection on filarial-specific IgG subclass response in neonates and their correlation with plasma levels IL-10 and interferon-γ, 145 pairs of mothers and their respective cord bloods were examined. Transplacental transfer of circulating filarial antigen (CFA) was observed in 34·8% cord bloods from CFA positive mothers. Filarial-specific IgG1, IgG2 and IgG4 responses of cord bloods were found to be positively correlated with CFA of mothers. In contrast, IgG3 responses negatively correlated with CFA of mothers. The % of similarity of recognition pattern in the cord blood with maternal blood was high for IgG3 response than IgG4 in all three groups. An increased levels of IL-10 and decreased levels of interferon gamma (IFN-γ) were observed in cord blood of infected mothers. Interferon gamma was positively correlated with IgG3 and negatively correlated with IgG4 level. On the other hand, IL-10 was positively correlated with IgG4 and CFA, indicating that cytokines may play a role in modulating the immune responses in cord bloods of sensitized foetus. The findings of the study reveal that in utero tolerance or sensitization may influence the filarial-specific immunity to infection in neonates.
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Affiliation(s)
- K G Achary
- Division of Immunology, Regional Medical Research Center (Indian Council of Medical Research), Bhubaneswar, Odisha, India
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O'Regan NL, Steinfelder S, Schwedler C, Rao GB, Srikantam A, Blanchard V, Hartmann S. Filariasis asymptomatically infected donors have lower levels of disialylated IgG compared to endemic normals. Parasite Immunol 2014; 36:713-20. [DOI: 10.1111/pim.12137] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 08/07/2014] [Indexed: 12/12/2022]
Affiliation(s)
- N. L. O'Regan
- Institute of Immunology; Center for Infection Medicine; Freie Universität Berlin; Berlin Germany
| | - S. Steinfelder
- Institute of Immunology; Center for Infection Medicine; Freie Universität Berlin; Berlin Germany
| | - C. Schwedler
- Clinical Chemistry and Pathobiochemistry; Institute of Laboratory Medicine; Charité Medical University; Berlin Germany
| | - G. B. Rao
- Blue Peter Public Health and Research Centre-LEPRA Society; Hyderabad Andhra Pradesh India
| | - A. Srikantam
- Blue Peter Public Health and Research Centre-LEPRA Society; Hyderabad Andhra Pradesh India
| | - V. Blanchard
- Clinical Chemistry and Pathobiochemistry; Institute of Laboratory Medicine; Charité Medical University; Berlin Germany
| | - S. Hartmann
- Institute of Immunology; Center for Infection Medicine; Freie Universität Berlin; Berlin Germany
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84
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Vidarsson G, Dekkers G, Rispens T. IgG subclasses and allotypes: from structure to effector functions. Front Immunol 2014; 5:520. [PMID: 25368619 PMCID: PMC4202688 DOI: 10.3389/fimmu.2014.00520] [Citation(s) in RCA: 1617] [Impact Index Per Article: 161.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Accepted: 10/06/2014] [Indexed: 12/21/2022] Open
Abstract
Of the five immunoglobulin isotypes, immunoglobulin G (IgG) is most abundant in human serum. The four subclasses, IgG1, IgG2, IgG3, and IgG4, which are highly conserved, differ in their constant region, particularly in their hinges and upper CH2 domains. These regions are involved in binding to both IgG-Fc receptors (FcγR) and C1q. As a result, the different subclasses have different effector functions, both in terms of triggering FcγR-expressing cells, resulting in phagocytosis or antibody-dependent cell-mediated cytotoxicity, and activating complement. The Fc-regions also contain a binding epitope for the neonatal Fc receptor (FcRn), responsible for the extended half-life, placental transport, and bidirectional transport of IgG to mucosal surfaces. However, FcRn is also expressed in myeloid cells, where it participates in both phagocytosis and antigen presentation together with classical FcγR and complement. How these properties, IgG-polymorphisms and post-translational modification of the antibodies in the form of glycosylation, affect IgG-function will be the focus of the current review.
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Affiliation(s)
- Gestur Vidarsson
- Department of Experimental Immunohematology, Sanquin Research, and Landsteiner Laboratory, Academic Medical Center, University of Amsterdam , Amsterdam , Netherlands
| | - Gillian Dekkers
- Department of Experimental Immunohematology, Sanquin Research, and Landsteiner Laboratory, Academic Medical Center, University of Amsterdam , Amsterdam , Netherlands
| | - Theo Rispens
- Department of Immunopathology, Sanquin Research, and Landsteiner Laboratory, Academic Medical Center, University of Amsterdam , Amsterdam , Netherlands
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O'Regan NL, Steinfelder S, Venugopal G, Rao GB, Lucius R, Srikantam A, Hartmann S. Brugia malayi microfilariae induce a regulatory monocyte/macrophage phenotype that suppresses innate and adaptive immune responses. PLoS Negl Trop Dis 2014; 8:e3206. [PMID: 25275395 PMCID: PMC4183501 DOI: 10.1371/journal.pntd.0003206] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 08/21/2014] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Monocytes and macrophages contribute to the dysfunction of immune responses in human filariasis. During patent infection monocytes encounter microfilariae in the blood, an event that occurs in asymptomatically infected filariasis patients that are immunologically hyporeactive. AIM To determine whether blood microfilariae directly act on blood monocytes and in vitro generated macrophages to induce a regulatory phenotype that interferes with innate and adaptive responses. METHODOLOGY AND PRINCIPAL FINDINGS Monocytes and in vitro generated macrophages from filaria non-endemic normal donors were stimulated in vitro with Brugia malayi microfilarial (Mf) lysate. We could show that monocytes stimulated with Mf lysate develop a defined regulatory phenotype, characterised by expression of the immunoregulatory markers IL-10 and PD-L1. Significantly, this regulatory phenotype was recapitulated in monocytes from Wuchereria bancrofti asymptomatically infected patients but not patients with pathology or endemic normals. Monocytes from non-endemic donors stimulated with Mf lysate directly inhibited CD4+ T cell proliferation and cytokine production (IFN-γ, IL-13 and IL-10). IFN-γ responses were restored by neutralising IL-10 or PD-1. Furthermore, macrophages stimulated with Mf lysate expressed high levels of IL-10 and had suppressed phagocytic abilities. Finally Mf lysate applied during the differentiation of macrophages in vitro interfered with macrophage abilities to respond to subsequent LPS stimulation in a selective manner. CONCLUSIONS AND SIGNIFICANCE Conclusively, our study demonstrates that Mf lysate stimulation of monocytes from healthy donors in vitro induces a regulatory phenotype, characterized by expression of PD-L1 and IL-10. This phenotype is directly reflected in monocytes from filarial patients with asymptomatic infection but not patients with pathology or endemic normals. We suggest that suppression of T cell functions typically seen in lymphatic filariasis is caused by microfilaria-modulated monocytes in an IL-10-dependent manner. Together with suppression of macrophage innate responses, this may contribute to the overall down-regulation of immune responses observed in asymptomatically infected patients.
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Affiliation(s)
- Noëlle Louise O'Regan
- Freie Universität Berlin, Center for Infection Medicine, Institute of Immunology, Berlin, Germany
| | - Svenja Steinfelder
- Freie Universität Berlin, Center for Infection Medicine, Institute of Immunology, Berlin, Germany
| | - Gopinath Venugopal
- Freie Universität Berlin, Center for Infection Medicine, Institute of Immunology, Berlin, Germany
| | - Gopala B. Rao
- Blue Peter Public Health and Research Centre-LEPRA Society, Hyderabad, Andhra Pradesh, India
| | - Richard Lucius
- Humboldt Universität Berlin, Department of Biology, Molecular Parasitology, Berlin, Germany
| | - Aparna Srikantam
- Blue Peter Public Health and Research Centre-LEPRA Society, Hyderabad, Andhra Pradesh, India
| | - Susanne Hartmann
- Freie Universität Berlin, Center for Infection Medicine, Institute of Immunology, Berlin, Germany
- * E-mail:
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86
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Clayton F, Fang JC, Gleich GJ, Lucendo AJ, Olalla JM, Vinson LA, Lowichik A, Chen X, Emerson L, Cox K, O'Gorman MA, Peterson KA. Eosinophilic esophagitis in adults is associated with IgG4 and not mediated by IgE. Gastroenterology 2014; 147:602-9. [PMID: 24907494 DOI: 10.1053/j.gastro.2014.05.036] [Citation(s) in RCA: 313] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 05/06/2014] [Accepted: 05/28/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS Eosinophilic esophagitis is usually triggered by foods, by unclear mechanisms. We evaluated the roles of IgE and IgG4 in the development of eosinophilic esophagitis. METHODS We performed a prospective, randomized, double-blind, placebo-controlled trial of adults with eosinophilic esophagitis given an antibody against IgE (omalizumab, n = 16) or placebo (n = 14) every 2-4 weeks for 16 weeks, based on weight and serum level of IgE. Endoscopy was performed, esophageal biopsy specimens were collected, and symptoms were assessed at baseline and at 16 weeks. Maximum numbers of eosinophils/high-power field were determined. Homogenates of esophageal biopsy specimens from 11 subjects with eosinophilic esophagitis and 8 without (controls) were assessed for IgM, IgA, and IgG subclasses. In a retrospective analysis, we performed immunofluorescence analysis of IgG4 in fixed esophageal tissues from 2 patients with eosinophilic esophagitis who underwent esophagectomy and 47 consecutive autopsies (controls). We also performed immunofluorescence analysis of IgG4 in esophageal mucosal biopsy specimens from 24 subjects with eosinophilic esophagitis and 9 without (controls). Finally, sera were collected from 15 subjects with eosinophilic esophagitis and from 41 without (controls), and assayed for total and food-reactive IgG4. RESULTS Omalizumab did not alter symptoms of eosinophilic esophagitis or eosinophil counts in biopsy samples compared with placebo. Homogenates of esophageal tissues from patients with eosinophilic esophagitis had a 45-fold increase in IgG4 compared with controls (P < 3 × 10(-5)), but no significant increases in other IgG subclasses, IgM, or IgA. Sparse stromal deposits resembling immune complexes were found in 2 of 5 eosinophilic esophagitis biopsy specimens based on ultrastructural analysis. Esophagectomy samples from 2 patients with eosinophilic esophagitis contained 180 and 300 IgG4 plasma cells/maximal high-power field, mainly in the deep lamina propria; these levels were greater than in tissues from controls. Fibrosis essentially was exclusive to the lamina propria. Granular extracellular IgG4 was detected in biopsy specimens from 21 of 24 patients with eosinophilic esophagitis, but in none of the specimens from 9 controls (P = 6 × 10(-6)). The total serum level of IgG4 increased only slightly in patients with eosinophilic esophagitis, compared with controls. Subjects with eosinophilic esophagitis had increased serum levels of IgG4 that reacted with milk, wheat, egg, and nuts-the 4 foods that most commonly trigger this condition (P ≤ 3 × 10(-4) for each food). CONCLUSIONS In a prospective trial, omalizumab did not reduce symptoms of eosinophilic esophagitis or tissue eosinophil counts compared with placebo. This finding, along with observed granular deposits of IgG4, abundant IgG4-containing plasma cells, and serum levels of IgG4 reactive to specific foods, indicate that, in adults, eosinophilic esophagitis is IgG4-associated, and not an IgE-induced allergy. ClinicalTrials.gov number: NCT 00123630.
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Affiliation(s)
- Frederic Clayton
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah.
| | - John C Fang
- Gastroenterology Division, University of Utah School of Medicine, Salt Lake City, Utah
| | - Gerald J Gleich
- Department of Medicine, University of Utah School of Medicine, Salt Lake City, Utah; Department of Dermatology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Alfredo J Lucendo
- Department of Gastroenterology, Hospital General de Tomelloso, Tomelloso, Ciudad Real, Spain
| | - Jose M Olalla
- Department of Pathology, Servicio de Salud de Castilla-La Mancha, Hospital La Mancha Centro, Ciudad Real, Spain
| | - Laura A Vinson
- Gastroenterology Division, University of Utah School of Medicine, Salt Lake City, Utah
| | - Amy Lowichik
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah; Department of Pathology, Primary Children's Hospital, Salt Lake City, Utah
| | - Xinjian Chen
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Lyska Emerson
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah
| | - Kristen Cox
- Gastroenterology Division, University of Utah School of Medicine, Salt Lake City, Utah
| | - Molly A O'Gorman
- Gastroenterology Division, University of Utah School of Medicine, Salt Lake City, Utah; Division of Gastroenterology, Primary Children's Hospital, Salt Lake City, Utah
| | - Kathryn A Peterson
- Gastroenterology Division, University of Utah School of Medicine, Salt Lake City, Utah
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87
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Harnessing the helminth secretome for therapeutic immunomodulators. BIOMED RESEARCH INTERNATIONAL 2014; 2014:964350. [PMID: 25133189 PMCID: PMC4123613 DOI: 10.1155/2014/964350] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/28/2014] [Accepted: 05/29/2014] [Indexed: 12/24/2022]
Abstract
Helminths are the largest and most complex pathogens to invade and live within the human body. Since they are not able to outpace the immune system by rapid antigen variation or faster cell division or retreat into protective niches not accessible to immune effector mechanisms, their long-term survival depends on influencing and regulating the immune responses away from the mode of action most damaging to them. Immunologists have focused on the excretory and secretory products that are released by the helminths, since they can change the host environment by modulating the immune system. Here we give a brief overview of the helminth-associated immune response and the currently available helminth secretome data. We introduce some major secretome-derived immunomodulatory molecules and describe their potential mode of action. Finally, the applicability of helminth-derived therapeutic proteins in the treatment of allergic and autoimmune inflammatory disease is discussed.
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88
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Maizels RM, McSorley HJ, Smyth DJ. Helminths in the hygiene hypothesis: sooner or later? Clin Exp Immunol 2014; 177:38-46. [PMID: 24749722 PMCID: PMC4089153 DOI: 10.1111/cei.12353] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/10/2014] [Indexed: 02/07/2023] Open
Abstract
There is increasing recognition that exposures to infectious agents evoke fundamental effects on the development and behaviour of the immune system. Moreover, where infections (especially parasitic infections) have declined, immune responses appear to be increasingly prone to hyperactivity. For example, epidemiological studies of parasite-endemic areas indicate that prenatal or early-life experience of infections can imprint an individual's immunological reactivity. However, the ability of helminths to dampen pathology in established inflammatory diseases implies that they can have therapeutic effects even if the immune system has developed in a low-infection setting. With recent investigations of how parasites are able to modulate host immune pathology at the level of individual parasite molecules and host cell populations, we are now able to dissect the nature of the host-parasite interaction at both the initiation and recall phases of the immune response. Thus the question remains - is the influence of parasites on immunity one that acts primarily in early life, and at initiation of the immune response, or in adulthood and when recall responses occur? In short, parasite immunosuppression - sooner or later?
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Affiliation(s)
- R M Maizels
- Institute for Immunology and Infection Research, Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, UK
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89
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Harris NL, Pleass R, Behnke JM. Understanding the role of antibodies in murine infections with Heligmosomoides (polygyrus) bakeri: 35 years ago, now and 35 years ahead. Parasite Immunol 2014; 36:115-24. [PMID: 23889357 DOI: 10.1111/pim.12057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 07/24/2013] [Indexed: 12/14/2022]
Abstract
The rodent intestinal nematode H.p.bakeri has played an important role in the exploration of the host-parasite relationship of chronic nematode infections for over six decades, since the parasite was first isolated in the 1950s by Ehrenford. It soon became a popular laboratory model providing a tractable experimental system that is easy to maintain in the laboratory and far more cost-effective than other laboratory nematode-rodent model systems. Immunity to this parasite is complex, dependent on antibodies, but confounded by the parasite's potent immunosuppressive secretions that facilitate chronic survival in murine hosts. In this review, we remind readers of the state of knowledge in the 1970s, when the first volume of Parasite Immunology was published, focusing on the role of antibodies in protective immunity. We show how our understanding of the host-parasite relationship then developed over the following 35 years to date, we propose testable hypotheses for future researchers to tackle, and we speculate on how the new technologies will be applied to enable an increasingly refined understanding of the role of antibodies in host-protective immunity, and its evasion, to be achieved in the longer term.
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Affiliation(s)
- N L Harris
- Global Health Institute and Swiss Vaccine Research Institute, École Polytechnique Fédèrale de Lausanne (EPFL), Switzerland
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90
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Gentil K, Lentz CS, Rai R, Muhsin M, Kamath AD, Mutluer O, Specht S, Hübner MP, Hoerauf A. Eotaxin-1 is involved in parasite clearance during chronic filarial infection. Parasite Immunol 2014; 36:60-77. [PMID: 24112106 DOI: 10.1111/pim.12079] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 09/19/2013] [Indexed: 01/10/2023]
Abstract
Eosinophil migration as key feature of helminth infection is increased during infection with filarial nematodes. In a mouse model of filariasis, we investigated the role of the eosinophil-attracting chemokine Eotaxin-1 on disease outcome. BALB/c and Eotaxin-1(-/-) mice were infected with the rodent filaria Litomosoides sigmodontis, and parasitic parameters, cellular migration to the site of infection, and cellular responsiveness were investigated. We found increased parasite survival but unaffected eosinophil migration to the site of infection in Eotaxin-1(-/-) mice. Expression of CD80 and CD86 was reduced on eosinophils from Eotaxin-1(-/-) mice after in vitro TLR2 stimulation and exposure to filarial antigen, respectively, suggesting a potential reduced activation state of eosinophils in Eotaxin-1 deficient mice. We further demonstrated that macrophages from Eotaxin-1(-/-) mice produce decreased amounts of IL-6 in vitro, a cytokine found to be associated with parasite containment, suggesting possible mechanisms by which Eotaxin-1 regulates activation of inflammatory cells and thus parasite survival.
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Affiliation(s)
- K Gentil
- Institute of Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
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91
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Arndts K, Specht S, Debrah AY, Tamarozzi F, Klarmann Schulz U, Mand S, Batsa L, Kwarteng A, Taylor M, Adjei O, Martin C, Layland LE, Hoerauf A. Immunoepidemiological profiling of onchocerciasis patients reveals associations with microfilaria loads and ivermectin intake on both individual and community levels. PLoS Negl Trop Dis 2014; 8:e2679. [PMID: 24587458 PMCID: PMC3930501 DOI: 10.1371/journal.pntd.0002679] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Accepted: 12/19/2013] [Indexed: 11/19/2022] Open
Abstract
Mass drug administration (MDA) programmes against Onchocerca volvulus use ivermectin (IVM) which targets microfilariae (MF), the worm's offspring. Most infected individuals are hyporesponsive and present regulated immune responses despite high parasite burden. Recently, with MDA programmes, the existence of amicrofilaridermic (a-MF) individuals has become apparent but little is known about their immune responses. Within this immunoepidemiological study, we compared parasitology, pathology and immune profiles in infection-free volunteers and infected individuals that were MF(+) or a-MF. The latter stemmed from villages in either Central or Ashanti regions of Ghana which, at the time of the study, had received up to eight or only one round of MDA respectively. Interestingly, a-MF patients had fewer nodules and decreased IL-10 responses to all tested stimuli. On the other hand, this patient group displayed contrary IL-5 profiles following in vitro stimulation or in plasma and the dampened response in the latter correlated to reduced eosinophils and associated factors but elevated neutrophils. Furthermore, multivariable regression analysis with covariates MF, IVM or the region (Central vs. Ashanti) revealed that immune responses were associated with different covariates: whereas O. volvulus-specific IL-5 responses were primarily associated with MF, IL-10 secretion had a negative correlation with times of individual IVM therapy (IIT). All plasma parameters (eosinophil cationic protein, IL-5, eosinophils and neutrophils) were highly associated with MF. With regards to IL-17 secretion, although no differences were observed between the groups to filarial-specific or bystander stimuli, these responses were highly associated with the region. These data indicate that immune responses are affected by both, IIT and the rounds of IVM MDA within the community. Consequently, it appears that a lowered infection pressure due to IVM MDA may affect the immune profile of community members even if they have not regularly participated in the programmes.
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Affiliation(s)
- Kathrin Arndts
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Sabine Specht
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Alexander Y. Debrah
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kumasi, Ghana
- Faculty of Allied Health Sciences and School of Medical Sciences of Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Francesca Tamarozzi
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - Ute Klarmann Schulz
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
- Institute of Medical Biometry, Informatics and Epidemiology (IMBIE), University Hospital Bonn, Bonn, Germany
| | - Sabine Mand
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Linda Batsa
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kumasi, Ghana
| | - Alexander Kwarteng
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Mark Taylor
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - Ohene Adjei
- Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kumasi, Ghana
- Faculty of Allied Health Sciences and School of Medical Sciences of Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Coralie Martin
- UMR 7245 MCAM MNHN CNRS, Museum National d'Histoire Naturelle, Paris, France
| | - Laura E. Layland
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
| | - Achim Hoerauf
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
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92
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Helpful or a Hindrance: Co-infections with Helminths During Malaria. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 828:99-129. [DOI: 10.1007/978-1-4939-1489-0_5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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93
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Castillo-Rama M, Sebagh M, Sasatomi E, Randhawa P, Isse K, Salgarkar AD, Ruppert K, Humar A, Demetris AJ. "Plasma cell hepatitis" in liver allografts: identification and characterization of an IgG4-rich cohort. Am J Transplant 2013; 13:2966-77. [PMID: 24011021 DOI: 10.1111/ajt.12413] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 05/22/2013] [Accepted: 05/23/2013] [Indexed: 01/25/2023]
Abstract
Plasma cell hepatitis (PCH), also known as "de novo autoimmune" hepatitis, is an increasingly recognized, but suboptimally named and poorly understood, category of late allograft dysfunction strongly resembling autoimmune hepatitis (AIH): They share plasma-cell-rich necro-inflammatory activity on biopsy, autoantibodies and steroid responsiveness, but overlap with rejection is problematic. A retrospective study of clinical, serological, histopathological and IgG4 immunohistological features of PCH (n = 20) in liver allograft recipients, native liver AIH (n = 19) and plasma-cell-rich renal allograft rejection (n = 20) showed: (1) high frequency (44%) of HLA-DR15; (2) less female predominance (p = 0.03) and (3) n = 9/20 PCH recipients showed >25 IgG4+ plasma cells/high-power field (IgG4+ PCH) versus AIH (n = 1/19, p = 0.008) or plasma-cell-rich kidney rejection (n = 2/20, p = 0.03). The IgG4+ PCH (n = 9) subgroup showed lower alanine transaminase (ALT) (p < 0.01) and aspartate transaminase (AST) (p < 0.05) at index biopsy but (a) higher plasma cell number/percentage, (b) more aggressive-appearing portal/periportal and perivenular necro-inflammatory activity and (c) more severe portal/periportal fibrosis than IgG4- PCH (n = 11). Significant demographic, histopathologic and plasma cell phenotype differences between PCH and AIH suggest distinct pathogenic mechanisms for at least the IgG4+ PCH subgroup likely representing an overlap between allo- and auto-immunity. IgG4+ PCH was associated with fibrosis, but also highly responsive to increased immunosuppression.
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Affiliation(s)
- M Castillo-Rama
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, PA; Department of Pathology, Division of Liver and Transplantation Pathology, Thomas E Starzl Transplantation, University of Pittsburgh, Pittsburgh, PA
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94
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Metenou S, Nutman TB. Regulatory T cell subsets in filarial infection and their function. Front Immunol 2013; 4:305. [PMID: 24137161 PMCID: PMC3786323 DOI: 10.3389/fimmu.2013.00305] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 09/13/2013] [Indexed: 01/11/2023] Open
Abstract
Filarial infections in humans are chronic infections that cause significant morbidity. The chronic nature of these infections with continuous antigen release is associated with a parasite-specific T cell hypo-responsiveness that may over time also affect the immune responses to bystander antigens. Previous studies have shown the filarial parasite antigen-specific T cells hypo-responsiveness is mediated by regulatory cytokines – IL-10 and TGF-β in particular. Recent studies have suggested that the modulated/regulated T cell responses associated with patent filarial infection may reflect an expansion of regulatory T cells (Tregs) that include both Tregs induced in peripheral circulation or pTregs and the thymus-derived Tregs or tTregs. Although much is known about the phenotype of these regulatory populations, the mechanisms underlying their expansion and their mode of action in filarial and other infections remain unclear. Nevertheless there are data to suggest that while many of these regulatory cells are activated in an antigen-specific manner the ensuing effectors of this activation are relatively non-specific and may affect a broad range of immune cells. This review will focus on the subsets and function of regulatory T cells in filarial infection.
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Affiliation(s)
- Simon Metenou
- Helminth Immunology Section, Laboratory of Parasitic Diseases, National Institutes of Health , Bethesda, MD , USA
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95
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Lighaam LC, Vermeulen E, Bleker TD, Meijlink KJ, Aalberse RC, Barnes E, Culver EL, van Ham SM, Rispens T. Phenotypic differences between IgG4+ and IgG1+ B cells point to distinct regulation of the IgG4 response. J Allergy Clin Immunol 2013; 133:267-70.e1-6. [PMID: 24074895 DOI: 10.1016/j.jaci.2013.07.044] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Revised: 07/19/2013] [Accepted: 07/31/2013] [Indexed: 12/13/2022]
Affiliation(s)
- Laura C Lighaam
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Ellen Vermeulen
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Tamara den Bleker
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Kimberley J Meijlink
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Rob C Aalberse
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Eleanor Barnes
- Nuffield Department of Medicine, Oxford University, Oxford, United Kingdom
| | - Emma L Culver
- Nuffield Department of Medicine, Oxford University, Oxford, United Kingdom
| | - S Marieke van Ham
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Theo Rispens
- Sanquin Blood Supply, Division of Research, Amsterdam, The Netherlands; Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands.
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96
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Hübner MP, Layland LE, Hoerauf A. Helminths and their implication in sepsis - a new branch of their immunomodulatory behaviour? Pathog Dis 2013; 69:127-41. [PMID: 23929557 PMCID: PMC4285315 DOI: 10.1111/2049-632x.12080] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 07/24/2013] [Accepted: 07/31/2013] [Indexed: 01/04/2023] Open
Abstract
The prevalence of autoimmune and allergic disorders has dramatically increased in developed countries, and it is believed that our ‘cleaner living’ reduces exposure to certain microorganisms and leads to deviated and/or reduced regulation of the immune system. In substantiation of this health hygiene hypothesis, multiple epidemiological studies and animal models have characterized the protective immune responses induced by helminths during auto-inflammatory disorders. The beneficial effects of such helminths, like schistosomes and filariae, are thought to lie in their immunomodulatory capacity, which can be induced by different life-cycle stages or components thereof. In addition to suppressing autoimmunity recent evidence indicates that concurrent helminth infections also counterbalance exacerbated pro-inflammatory immune responses that occur during sepsis, improving survival. As with allergy, epidemiological studies have observed a steady rise in severe sepsis cases and although this may have resulted from several factors (immunosuppressive drugs, chemotherapy, transplantation, increased awareness and increased surgical procedures), it is tempting to hypothesize that the lack of helminth infections in Western countries may have contributed to this phenomenon. This review summarizes how helminths modulate host immunity during sepsis, such as manipulating macrophage activation and provides an overview about the possible implications that may arise during overwhelming bacterial co-infections. This well written review gives a comprehensive overview on the immunopathology of sepsis and the modulation of immune responses by helminths. It provides evidence that helminths or components thereof may improve the outcome of severe infections. This will allow the development of therapeutic strategies to fight infections and sepsis.
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Affiliation(s)
- Marc P Hübner
- Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Hospital Bonn, Bonn, Germany
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97
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Adjobimey T, Satoguina J, Oldenburg J, Hoerauf A, Layland LE. Co-activation through TLR4 and TLR9 but not TLR2 skews Treg-mediated modulation of Igs and induces IL-17 secretion in Treg: B cell co-cultures. Innate Immun 2013; 20:12-23. [PMID: 23529856 DOI: 10.1177/1753425913479414] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Whereas Th17 cells are associated with aggravated inflammation, regulatory T cells (Tregs) provide an environment to control overt responses. Nevertheless, Tregs display a certain degree of plasticity demonstrating that T cell differentiation processes are not absolute. Previously, we showed that human Treg clones induced B cells to produce IgG4. Here we focus on the actions of freshly isolated CD4(+)CD25(+)Foxp3(+)CD127(dim) Tregs on Ig production by B cells and the consequences of prior TLR activation of B cells. In the absence of TLR stimuli, Tregs, but not conventional T cells, dampened B cell proliferation, plasma cell formation and, with the exception of IgG4, all other Ig production. Although IgG4 levels were unchanged in total B cell:Treg co-cultures, levels were increased in Treg co-cultures of naive, but not memory, B cells. Triggering TLR on B cells skewed both Ig and cytokine secretion patterns and, surprisingly, Tregs within TLR4- and TLR9- but not TLR2-triggered B cell co-cultures up-regulated retinoic acid related orphan receptor (RORC) and produced IL-17. These data indicate that under conditions like bacterial or viral infections, B cells can escape Treg control, and provides an explanation as to why patients suffering from allergy or helminth infections display polar immunopathological symptoms despite being exposed to the same agent.
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Affiliation(s)
- Tomabu Adjobimey
- 1Institute of Medical Microbiology, Immunology and Parasitology (IMMIP), University Clinic Bonn, Bonn, Germany
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98
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Daniłowicz-Luebert E, Steinfelder S, Kühl AA, Drozdenko G, Lucius R, Worm M, Hamelmann E, Hartmann S. A nematode immunomodulator suppresses grass pollen-specific allergic responses by controlling excessive Th2 inflammation. Int J Parasitol 2013; 43:201-10. [DOI: 10.1016/j.ijpara.2012.10.014] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 10/18/2012] [Accepted: 10/24/2012] [Indexed: 11/16/2022]
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99
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Suzuki LA, Rossi CL. Evaluation of cysticercus-specific IgG (total and subclasses) and IgE antibody responses in cerebrospinal fluid samples from patients with neurocysticercosis showing intrathecal production of specific IgG antibodies. ARQUIVOS DE NEURO-PSIQUIATRIA 2013; 71:106-9. [PMID: 23295367 DOI: 10.1590/s0004-282x2013005000002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Accepted: 09/24/2012] [Indexed: 12/24/2022]
Abstract
In the present study, an enzyme-linked immunosorbent assay (ELISA) standardized with vesicular fluid of Taenia solium cysticerci was used to screen for IgG (total and subclasses) and IgE antibodies in cerebrospinal fluid (CSF) samples from patients with neurocysticercosis showing intrathecal production of specific IgG antibodies and patients with other neurological disorders. The following results were obtained: IgG-ELISA: 100% sensitivity (median of the ELISA absorbances (MEA)=1.17) and 100% specificity; IgG1-ELISA: 72.7% sensitivity (MEA=0.49) and 100% specificity; IgG2-ELISA: 81.8% sensitivity (MEA=0.46) and 100% specificity; IgG3-ELISA: 63.6% sensitivity (MEA=0.12) and 100% specificity; IgG4-ELISA: 90.9% sensitivity (MEA=0.85) and 100% specificity; IgE-ELISA 93.8% sensitivity (MEA=0.60) and 100% specificity. There were no significant differences between the sensitivities and specificities in the detection of IgG-ELISA and IgE-ELISA, although in CSF samples from patients with neurocysticercosis the MEA of the IgG-ELISA was significantly higher than that of the IgE-ELISA. The sensitivity and MEA values of the IgG4-ELISA were higher than the corresponding values for the other IgG subclasses. Future studies should address the contribution of IgG4 and IgE antibodies to the physiopathology of neurocysticercosis.
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Affiliation(s)
- Lisandra Akemi Suzuki
- Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Campinas, SP, Brazil
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Dense IgG4 plasma cell infiltrates associated with chronic infectious aortitis: implications for the diagnosis of IgG4-related disease. Cardiovasc Pathol 2012; 21:470-5. [DOI: 10.1016/j.carpath.2012.02.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 02/01/2012] [Accepted: 02/02/2012] [Indexed: 12/24/2022] Open
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