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Liao D, Su X, Wang J, Yu J, Luo H, Tian W, Ye Z, He J. Pushing the envelope: Immune mechanism and application landscape of macrophage-activating lipopeptide-2. Front Immunol 2023; 14:1113715. [PMID: 36761746 PMCID: PMC9902699 DOI: 10.3389/fimmu.2023.1113715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/10/2023] [Indexed: 01/25/2023] Open
Abstract
Mycoplasma fermentans can cause respiratory diseases, arthritis, genitourinary tract infections, and chronic fatigue syndrome and have been linked to the development of the human immunodeficiency virus. Because mycoplasma lacks a cell wall, its outer membrane lipoproteins are one of the main factors that induce inflammation in the organism and contribute to disease development. Macrophage-activating lipopeptide-2 (MALP-2) modulates the inflammatory response of monocytes/macrophages in a bidirectional fashion, indirectly enhances the cytotoxicity of NK cells, promotes oxidative bursts in neutrophils, upregulates surface markers on lymphocytes, enhances antigen presentation on dendritic cells and induces immune inflammatory responses in sebocytes and mesenchymal cells. MALP-2 is a promising vaccine adjuvant for this application. It also promotes vascular healing and regeneration, accelerates wound and bone healing, suppresses tumors and metastasis, and reduces lung infections and inflammation. MALP-2 has a simple structure, is easy to synthesize, and has promising prospects for clinical application. Therefore, this paper reviews the mechanisms of MALP-2 activation in immune cells, focusing on the application of MALP-2 in animals/humans to provide a basis for the study of pathogenesis in Mycoplasma fermentans and the translation of MALP-2 into clinical applications.
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Affiliation(s)
- Daoyong Liao
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Xiaoling Su
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jingyun Wang
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jianwei Yu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Haodang Luo
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China,Institute of Pathogenic Biology, Hengyang Medical School, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, China
| | - Wei Tian
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Zufeng Ye
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jun He
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China,*Correspondence: Jun He,
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Dorna J, Kaufmann A, Bockmann V, Raifer H, West J, Matrosovich M, Bauer S. Effects of Receptor Specificity and Conformational Stability of Influenza A Virus Hemagglutinin on Infection and Activation of Different Cell Types in Human PBMCs. Front Immunol 2022; 13:827760. [PMID: 35359920 PMCID: PMC8963867 DOI: 10.3389/fimmu.2022.827760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 02/16/2022] [Indexed: 11/13/2022] Open
Abstract
Humans can be infected by zoonotic avian, pandemic and seasonal influenza A viruses (IAVs), which differ by receptor specificity and conformational stability of their envelope glycoprotein hemagglutinin (HA). It was shown that receptor specificity of the HA determines the tropism of IAVs to human airway epithelial cells, the primary target of IAVs in humans. Less is known about potential effects of the HA properties on viral attachment, infection and activation of human immune cells. To address this question, we studied the infection of total human peripheral blood mononuclear cells (PBMCs) and subpopulations of human PBMCs with well characterized recombinant IAVs differing by the HA and the neuraminidase (NA) but sharing all other viral proteins. Monocytes and all subpopulations of lymphocytes were significantly less susceptible to infection by IAVs with avian-like receptor specificity as compared to human-like IAVs, whereas plasmacytoid dendritic cells (pDCs) and myeloid dendritic cells were equally susceptible to IAVs with avian-like and human-like receptor specificity. This tropism correlated with the surface expression of 2-3-linked sialic acids (avian-type receptors) and 2-6-linked sialic acids (human-type receptors). Despite a reduced infectivity of avian-like IAVs for PBMCs, these viruses were not less efficient than human-like IAVs in terms of cell activation as judged by the induction of cellular mRNA of IFN-α, CCL5, RIG-I, and IL-6. Elevated levels of IFN-α mRNA were accompanied by elevated IFN-α protein secretion in primary human pDC. We found that high basal expression in monocytes of antiviral interferon-induced transmembrane protein 3 (IFITM3) limited viral infection in these cells. siRNA-mediated knockdown of IFITM3 in monocytes demonstrated that viral sensitivity to inhibition by IFITM3 correlated with the conformational stability of the HA. Our study provides new insights into the role of host- and strain-specific differences of HA in the interaction of IAVs with human immune cells and advances current understanding of the mechanisms of viral cell tropism, pathogenesis and markers of virulence.
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Affiliation(s)
- Jens Dorna
- Institute for Immunology, Philipps University Marburg, Marburg, Germany
| | - Andreas Kaufmann
- Institute for Immunology, Philipps University Marburg, Marburg, Germany
| | - Viktoria Bockmann
- Institute for Immunology, Philipps University Marburg, Marburg, Germany
| | - Hartmann Raifer
- Core Facility FACS, Philipps University Marburg, Marburg, Germany
| | - Johanna West
- Institute of Virology, Philipps University Marburg, Marburg, Germany
| | - Mikhail Matrosovich
- Institute of Virology, Philipps University Marburg, Marburg, Germany
- *Correspondence: Stefan Bauer, ; Mikhail Matrosovich,
| | - Stefan Bauer
- Institute for Immunology, Philipps University Marburg, Marburg, Germany
- *Correspondence: Stefan Bauer, ; Mikhail Matrosovich,
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SARS-CoV-2, Zika viruses and mycoplasma: Structure, pathogenesis and some treatment options in these emerging viral and bacterial infectious diseases. Biochim Biophys Acta Mol Basis Dis 2021; 1867:166264. [PMID: 34481867 PMCID: PMC8413106 DOI: 10.1016/j.bbadis.2021.166264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 07/22/2021] [Accepted: 08/30/2021] [Indexed: 01/28/2023]
Abstract
The molecular evolution of life on earth along with changing environmental, conditions has rendered mankind susceptible to endemic and pandemic emerging infectious diseases. The effects of certain systemic viral and bacterial infections on morbidity and mortality are considered as examples of recent emerging infections. Here we will focus on three examples of infections that are important in pregnancy and early childhood: SARS-CoV-2 virus, Zika virus, and Mycoplasma species. The basic structural characteristics of these infectious agents will be examined, along with their general pathogenic mechanisms. Coronavirus infections, such as caused by the SARS-CoV-2 virus, likely evolved from zoonotic bat viruses to infect humans and cause a pandemic that has been the biggest challenge for humanity since the Spanish Flu pandemic of the early 20th century. In contrast, Zika Virus infections represent an expanding infectious threat in the context of global climate change. The relationship of these infections to pregnancy, the vertical transmission and neurological sequels make these viruses highly relevant to the topics of this special issue. Finally, mycoplasmal infections have been present before mankind evolved, but they were rarely identified as human pathogens until recently, and they are now recognized as important coinfections that are able to modify the course and prognosis of various infectious diseases and other chronic illnesses. The infectious processes caused by these intracellular microorganisms are examined as well as some general aspects of their pathogeneses, clinical presentations, and diagnoses. We will finally consider examples of treatments that have been used to reduce morbidity and mortality of these infections and discuss briefly the current status of vaccines, in particular, against the SARS-CoV-2 virus. It is important to understand some of the basic features of these emerging infectious diseases and the pathogens involved in order to better appreciate the contributions of this special issue on how infectious diseases can affect human pregnancy, fetuses and neonates.
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Zhou X, Yu W, Lyu SC, Macaubas C, Bunning B, He Z, Mellins ED, Nadeau KC. A positive feedback loop reinforces the allergic immune response in human peanut allergy. J Exp Med 2021; 218:e20201793. [PMID: 33944900 PMCID: PMC8103542 DOI: 10.1084/jem.20201793] [Citation(s) in RCA: 7] [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: 08/19/2020] [Revised: 12/18/2020] [Accepted: 03/04/2021] [Indexed: 12/13/2022] Open
Abstract
Food allergies are a leading cause of anaphylaxis, and cellular mechanisms involving antigen presentation likely play key roles in their pathogenesis. However, little is known about the response of specific antigen-presenting cell (APC) subsets to food allergens in the setting of food allergies. Here, we show that in peanut-allergic humans, peanut allergen drives the differentiation of CD209+ monocyte-derived dendritic cells (DCs) and CD23+ (FcєRII) myeloid dendritic cells through the action of allergen-specific CD4+ T cells. CD209+ DCs act reciprocally on the same peanut-specific CD4+ T cell population to reinforce Th2 cytokine expression in a positive feedback loop, which may explain the persistence of established food allergy. In support of this novel model, we show clinically that the initiation of oral immunotherapy (OIT) in peanut-allergic patients is associated with a decrease in CD209+ DCs, suggesting that breaking the cycle of positive feedback is associated with therapeutic effect.
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Affiliation(s)
- Xiaoying Zhou
- Sean N. Parker Center for Allergy & Asthma Research at Stanford University and Division of Pulmonary, Allergy, and Critical Care Medicine, Stanford, CA
| | - Wong Yu
- Sean N. Parker Center for Allergy & Asthma Research at Stanford University and Division of Pulmonary, Allergy, and Critical Care Medicine, Stanford, CA
| | - Shu-Chen Lyu
- Sean N. Parker Center for Allergy & Asthma Research at Stanford University and Division of Pulmonary, Allergy, and Critical Care Medicine, Stanford, CA
| | - Claudia Macaubas
- Department of Pediatrics, Program in Immunology, Stanford University, Stanford, CA
| | - Bryan Bunning
- Sean N. Parker Center for Allergy & Asthma Research at Stanford University and Division of Pulmonary, Allergy, and Critical Care Medicine, Stanford, CA
| | - Ziyuan He
- Sean N. Parker Center for Allergy & Asthma Research at Stanford University and Division of Pulmonary, Allergy, and Critical Care Medicine, Stanford, CA
| | - Elizabeth D. Mellins
- Department of Pediatrics, Program in Immunology, Stanford University, Stanford, CA
| | - Kari C. Nadeau
- Sean N. Parker Center for Allergy & Asthma Research at Stanford University and Division of Pulmonary, Allergy, and Critical Care Medicine, Stanford, CA
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Franzoni G, Anfossi A, De Ciucis CG, Mecocci S, Carta T, Dei Giudici S, Fruscione F, Zinellu S, Vito G, Graham SP, Oggiano A, Chessa B, Razzuoli E. Targeting Toll-Like Receptor 2: Polarization of Porcine Macrophages by a Mycoplasma-Derived Pam2cys Lipopeptide. Vaccines (Basel) 2021; 9:vaccines9070692. [PMID: 34201691 PMCID: PMC8310132 DOI: 10.3390/vaccines9070692] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/16/2021] [Accepted: 06/18/2021] [Indexed: 11/16/2022] Open
Abstract
Toll-like receptor 2 (TLR2) ligands are attracting increasing attention as prophylactic and immunotherapeutic agents against pathogens and tumors. We previously observed that a synthetic diacylated lipopeptide based on a surface protein of Mycoplasma agalactiae (Mag-Pam2Cys) strongly activated innate immune cells, including porcine monocyte-derived macrophages (moMΦ). In this study, we utilized confocal microscopy, flow cytometry, multiplex cytokine ELISA, and RT-qPCR to conduct a comprehensive analysis of the effects of scalar doses of Mag-Pam2Cys on porcine moMΦ. We observed enhanced expression of activation markers (MHC class I, MHC class II DR, CD25), increased phagocytotic activity, and release of IL-12 and proinflammatory cytokines. Mag-Pam2Cys also upregulated the gene expression of several IFN-α subtypes, p65, NOS2, and molecules with antimicrobial activities (CD14, beta defensin 1). Overall, our data showed that Mag-Pam2Cys polarized porcine macrophages towards a proinflammatory antimicrobial phenotype. However, Mag-Pam2Cys downregulated the expression of IFN-α3, six TLRs (TLR3, -4, -5, -7, -8, -9), and did not interfere with macrophage polarization induced by the immunosuppressive IL-10, suggesting that the inflammatory activity evoked by Mag-Pam2Cys could be regulated to avoid potentially harmful consequences. We hope that our in vitro results will lay the foundation for the further evaluation of this diacylated lipopeptide as an immunopotentiator in vivo.
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Affiliation(s)
- Giulia Franzoni
- Department of Animal Health, Istituto Zooprofilattico Sperimentale della Sardegna, 07100 Sassari, Italy; (T.C.); (S.D.G.); (S.Z.); (A.O.)
- Correspondence: (G.F.); (B.C.)
| | - Antonio Anfossi
- School of Veterinary Medicine, University of Sassari, 07100 Sassari, Italy;
| | - Chiara Grazia De Ciucis
- National Reference Center of Veterinary and Comparative Oncology (CEROVEC), Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d’Aosta, Piazza Borgo Pila 39/24, 16129 Genoa, Italy; (C.G.D.C.); (F.F.); (G.V.); (E.R.)
| | - Samanta Mecocci
- Department of Veterinary Medicine, University of Perugia, 06123 Perugia, Italy;
| | - Tania Carta
- Department of Animal Health, Istituto Zooprofilattico Sperimentale della Sardegna, 07100 Sassari, Italy; (T.C.); (S.D.G.); (S.Z.); (A.O.)
- School of Veterinary Medicine, University of Sassari, 07100 Sassari, Italy;
| | - Silvia Dei Giudici
- Department of Animal Health, Istituto Zooprofilattico Sperimentale della Sardegna, 07100 Sassari, Italy; (T.C.); (S.D.G.); (S.Z.); (A.O.)
| | - Floriana Fruscione
- National Reference Center of Veterinary and Comparative Oncology (CEROVEC), Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d’Aosta, Piazza Borgo Pila 39/24, 16129 Genoa, Italy; (C.G.D.C.); (F.F.); (G.V.); (E.R.)
| | - Susanna Zinellu
- Department of Animal Health, Istituto Zooprofilattico Sperimentale della Sardegna, 07100 Sassari, Italy; (T.C.); (S.D.G.); (S.Z.); (A.O.)
| | - Guendalina Vito
- National Reference Center of Veterinary and Comparative Oncology (CEROVEC), Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d’Aosta, Piazza Borgo Pila 39/24, 16129 Genoa, Italy; (C.G.D.C.); (F.F.); (G.V.); (E.R.)
| | | | - Annalisa Oggiano
- Department of Animal Health, Istituto Zooprofilattico Sperimentale della Sardegna, 07100 Sassari, Italy; (T.C.); (S.D.G.); (S.Z.); (A.O.)
| | - Bernardo Chessa
- School of Veterinary Medicine, University of Sassari, 07100 Sassari, Italy;
- Correspondence: (G.F.); (B.C.)
| | - Elisabetta Razzuoli
- National Reference Center of Veterinary and Comparative Oncology (CEROVEC), Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d’Aosta, Piazza Borgo Pila 39/24, 16129 Genoa, Italy; (C.G.D.C.); (F.F.); (G.V.); (E.R.)
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6
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Owen AM, Fults JB, Patil NK, Hernandez A, Bohannon JK. TLR Agonists as Mediators of Trained Immunity: Mechanistic Insight and Immunotherapeutic Potential to Combat Infection. Front Immunol 2021; 11:622614. [PMID: 33679711 PMCID: PMC7930332 DOI: 10.3389/fimmu.2020.622614] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/24/2020] [Indexed: 12/18/2022] Open
Abstract
Despite advances in critical care medicine, infection remains a significant problem that continues to be complicated with the challenge of antibiotic resistance. Immunocompromised patients are highly susceptible to development of severe infection which often progresses to the life-threatening condition of sepsis. Thus, immunotherapies aimed at boosting host immune defenses are highly attractive strategies to ward off infection and protect patients. Recently there has been mounting evidence that activation of the innate immune system can confer long-term functional reprogramming whereby innate leukocytes mount more robust responses upon secondary exposure to a pathogen for more efficient clearance and host protection, termed trained immunity. Toll-like receptor (TLR) agonists are a class of agents which have been shown to trigger the phenomenon of trained immunity through metabolic reprogramming and epigenetic modifications which drive profound augmentation of antimicrobial functions. Immunomodulatory TLR agonists are also highly beneficial as vaccine adjuvants. This review provides an overview on TLR signaling and our current understanding of TLR agonists which show promise as immunotherapeutic agents for combating infection. A brief discussion on our current understanding of underlying mechanisms is also provided. Although an evolving field, TLR agonists hold strong therapeutic potential as immunomodulators and merit further investigation for clinical translation.
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Affiliation(s)
- Allison M Owen
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Jessica B Fults
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States.,University of Texas Southwestern Medical School, Dallas, TX, United States
| | - Naeem K Patil
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Antonio Hernandez
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Julia K Bohannon
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States.,Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN, United States
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Xu D, Horst K, Wang W, Luo P, Shi Y, Tschernig T, Greven J, Hildebrand F. The Influence of Macrophage-Activating Lipopeptide 2 (MALP-2) on Local and Systemic Inflammatory Response in a Murine Two-Hit Model of Hemorrhagic Shock and Subsequent Sepsis. Inflammation 2021; 44:481-492. [PMID: 33420893 PMCID: PMC7794634 DOI: 10.1007/s10753-020-01329-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 07/07/2020] [Accepted: 08/19/2020] [Indexed: 12/15/2022]
Abstract
Pulmonary complications after severe trauma and sepsis remain to be the main cause for adverse outcome. MALP-2 has been described to exert beneficial effects on organ damage and the further course after isolated trauma and sepsis. However, the impact of MALP-2 on a clinically realistic two-hit scenario of trauma and subsequent sepsis remains unknown. We, therefore, investigated if the systemic inflammatory response and pulmonary immune response and damage are beneficially modulated by MALP-2 in a murine two-hit model. Blood pressure-controlled trauma-hemorrhage (TH) and cecal ligation and puncture (CLP) were induced in C57/BL6 mice. Mice were divided into 2 control groups (control 1: TH without CLP; control 2: TH and CLP) and 3 experimental groups treated with MALP-2 at different time points (ETH, end of TH; ECLP, end of CLP; and 6CLP 6 h after CLP). Survival rates were assessed over the observation period of 168 h after the induction of TH. Concentrations of plasma inflammatory cytokines and chemokines (TNF-α, IL-6, MIP-1α, IFN-γ, and IL-10) were assessed, and bacterial clearance of the lungs was determined. Furthermore, pulmonary MPO activity assay to evaluate the infiltration of polymorphonuclear neutrophils (PMN) and histological evaluation were performed. Survival rates were evaluated. Compared with control group 1, the level of TNF-α in the ECLP group showed a significant increase (ECLP, 2.27 pg./ml ± 1.39 vs. control 1: 0.16 pg./ml ± 0.11, p = 0.021). In contrast, levels of IFN-γ were significantly reduced in groups ETH and 6CLP compared with control group 1 (control 1: 8.92 pg./ml ± 4.38 vs. ETH: 1.77 pg./ml ± 4.34, p = 0.026 resp. vs. 6CLP: 1.83 pg./ml ± 4.49, p = 0.014). While systemic concentrations of inflammatory mediators were not affected by MALP-2 treatment, the lung tissue presented with significant alterations. Reduced MPO activity was lowest in group ECLP (ECLP 11,196.77 ± 547.81 vs. ETH 12,773.94 ± 1011.76; p = 0.023 resp. vs. 6CLP 13,155.19 ± 423.99, p = 0.016) in experimental groups. Also, histological damage after MALP-2 application was lowest in ECLP animals (ECLP 0.50 ± 0.08 vs. ETH 0.71 ± 0.05, p = 0.034 resp. vs. 6CLP 0.64 ± 0.08, p = 0.021). Furthermore, MALP-2 treatment was associated with a trend towards improved survival in the ECLP group (ECLP 83.3% vs. ETH 66.7 and 6CLP 58.3%, p > 0.05). Based on our results, MALP-2 might have beneficial effects on the clinical course after hemorrhage and sepsis by reducing pulmonary damage and PMN infiltration. This might also affect survival. According to our data, MALP-2 should be given at the earliest possible time point after the onset of sepsis. However, the optimal dosage and confirmation of our results in larger cohorts need to be the focus of further research.
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Affiliation(s)
- Ding Xu
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany. .,Department of Orthopedic Trauma Surgery, Ningbo No.6 Hospital, Ningbo, China.
| | - Klemens Horst
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany
| | - Weikang Wang
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany
| | - Peng Luo
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany.,Department of Orthopedic Trauma Surgery, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Yulong Shi
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany
| | - Thomas Tschernig
- Institute of Anatomy and Cell Biology, Saarland University, Saarbrücken, Germany
| | - Johannes Greven
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany
| | - Frank Hildebrand
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Aachen, Germany
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Mycoplasmas-Host Interaction: Mechanisms of Inflammation and Association with Cellular Transformation. Microorganisms 2020; 8:microorganisms8091351. [PMID: 32899663 PMCID: PMC7565387 DOI: 10.3390/microorganisms8091351] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 08/28/2020] [Accepted: 09/03/2020] [Indexed: 12/12/2022] Open
Abstract
Mycoplasmas are the smallest and simplest self-replicating prokaryotes. Located everywhere in nature, they are widespread as parasites of humans, mammals, reptiles, fish, arthropods, and plants. They usually exhibiting organ and tissue specificity. Mycoplasmas belong to the class named Mollicutes (mollis = soft and cutis = skin, in Latin), and their small size and absence of a cell wall contribute to distinguish them from other bacteria. Mycoplasma species are found both outside the cells as membrane surface parasites and inside the cells, where they become intracellular residents as "silent parasites". In humans, some Mycoplasma species are found as commensal inhabitants, while others have a significant impact on the cellular metabolism and physiology. Mollicutes lack typical bacterial PAMPs (e.g., lipoteichoic acid, flagellin, and some lipopolysaccharides) and consequently the exact molecular mechanisms of Mycoplasmas' recognition by the cells of the immune system is the subjects of several researches for its pathogenic implications. It is well known that several strains of Mycoplasma suppress the transcriptional activity of p53, resulting in reduced apoptosis of damaged cells. In addition, some Mycoplasmas were reported to have oncogenic potential since they demonstrated not just accumulation of abnormalities but also phenotypic changes of the cells. Aim of this review is to provide an update of the current literature that implicates Mycoplasmas in triggering inflammation and altering critical cellular pathways, thus providing a better insight into potential mechanisms of cellular transformation.
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9
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Zhao W, Bendickson L, Nilsen-Hamilton M. The Lipocalin2 Gene is Regulated in Mammary Epithelial Cells by NFκB and C/EBP In Response to Mycoplasma. Sci Rep 2020; 10:7641. [PMID: 32376831 PMCID: PMC7203223 DOI: 10.1038/s41598-020-63393-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 03/25/2020] [Indexed: 02/02/2023] Open
Abstract
Lcn2 gene expression increases in response to cell stress signals, particularly in cells involved in the innate immune response. Human Lcn2 (NGAL) is increased in the blood and tissues in response to many stressors including microbial infection and in response to LPS in myeloid and epithelial cells. Here we extend the microbial activators of Lcn2 to mycoplasma and describe studies in which the mechanism of Lcn2 gene regulation by MALP-2 and mycoplasma infection was investigated in mouse mammary epithelial cells. As for the LPS response of myeloid cells, Lcn2 expression in epithelial cells is preceded by increased TNFα, IL-6 and IκBζ expression and selective reduction of IκBζ reduces Lcn2 promoter activity. Lcn2 promoter activation remains elevated well beyond the period of exposure to MALP-2 and is persistently elevated in mycoplasma infected cells. Activation of either the human or the mouse Lcn2 promoter requires both NFκB and C/EBP for activation. Thus, Lcn2 is strongly and enduringly activated by mycoplasma components that stimulate the innate immune response with the same basic regulatory mechanism for the human and mouse genes.
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Affiliation(s)
- Wei Zhao
- Roy J Carver Department of Biochemistry, Biophysics and Molecular Biology and the Interdepartmental Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA, 50011, USA
- Interdepartmental Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA, 50011, USA
- Bayview Physicians Group, Battlefield Medical association, 675 North Battlefield Boulevard, Chesapeake, VA, 23320, USA
| | - Lee Bendickson
- Roy J Carver Department of Biochemistry, Biophysics and Molecular Biology and the Interdepartmental Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA, 50011, USA
| | - Marit Nilsen-Hamilton
- Roy J Carver Department of Biochemistry, Biophysics and Molecular Biology and the Interdepartmental Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA, 50011, USA.
- Interdepartmental Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA, 50011, USA.
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10
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Effects of Mycoplasmas on the Host Cell Signaling Pathways. Pathogens 2020; 9:pathogens9040308. [PMID: 32331465 PMCID: PMC7238135 DOI: 10.3390/pathogens9040308] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 04/18/2020] [Accepted: 04/19/2020] [Indexed: 12/22/2022] Open
Abstract
Mycoplasmas are the smallest free-living organisms. Reduced sizes of their genomes put constraints on the ability of these bacteria to live autonomously and make them highly dependent on the nutrients produced by host cells. Importantly, at the organism level, mycoplasmal infections may cause pathological changes to the host, including cancer and severe immunological reactions. At the molecular level, mycoplasmas often activate the NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) inflammatory response and concomitantly inhibit the p53-mediated response, which normally triggers the cell cycle and apoptosis. Thus, mycoplasmal infections may be considered as cancer-associated factors. At the same time, mycoplasmas through their membrane lipoproteins (LAMPs) along with lipoprotein derivatives (lipopeptide MALP-2, macrophage-activating lipopeptide-2) are able to modulate anti-inflammatory responses via nuclear translocation and activation of Nrf2 (the nuclear factor-E2-related anti-inflammatory transcription factor 2). Thus, interactions between mycoplasmas and host cells are multifaceted and depend on the cellular context. In this review, we summarize the current information on the role of mycoplasmas in affecting the host’s intracellular signaling mediated by the interactions between transcriptional factors p53, Nrf2, and NF-κB. A better understanding of the mechanisms underlying pathologic processes associated with reprogramming eukaryotic cells that arise during the mycoplasma-host cell interaction should facilitate the development of new therapeutic approaches to treat oncogenic and inflammatory processes.
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Haodang L, Lianmei Q, Ranhui L, Liesong C, Jun H, Yihua Z, Cuiming Z, Yimou W, Xiaoxing Y. HO-1 mediates the anti-inflammatory actions of Sulforaphane in monocytes stimulated with a mycoplasmal lipopeptide. Chem Biol Interact 2019; 306:10-18. [PMID: 30965051 DOI: 10.1016/j.cbi.2019.04.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 03/24/2019] [Accepted: 04/04/2019] [Indexed: 12/14/2022]
Abstract
Exposure to Mycoplasma pneumoniae leads to lung inflammation through a host defense pathway. Increasing evidence has indicated that the mycoplasma-derived membrane lipoprotein, or its analogue macrophage-activating lipopeptide-2 (MALP-2), excretes LPS as an immune system-stimulating substance and plays a crucial role in pathological injury during M. pneumoniae infection. It has been established that Sulforaphane confers anti-inflammatory properties. However, the underlying mechanism responsible for the inhibitory actions of Sulforaphane in the context of mycoplasmal pneumoniae are poorly understood. Here, we report that Sulforaphane is an inducer of heme oxygenase (HO)-1, a cytoprotective enzyme that catalyzes the degradation of heme through signaling pathways in human monocytes. Sulforaphane stimulated NF-E2-related factor 2 (Nrf2) translocation from the cytosol to the nucleus, and small interfering RNA-mediated knock-down of Nrf2 significantly inhibited Sulforaphane-induced HO-1 expression. Additionally, PI3K/Akt and ROS were also involved in Sulforaphane-induced Nrf2 activation and HO-1 expression, as revealed by the pharmacological inhibitors LY294002 and NAC. Moreover, Sulforaphane treatment inhibited MALP-2-induced pro-inflammatory cytokine secretion and pulmonary inflammation in mice, as well as MALP-2-triggered NF-κB activation. Furthermore, SnPP, a selective inhibitor of HO-1, reversed the inhibitory actions of Sulforaphane, while a carbon monoxide-releasing molecule, CORM-2, caused a significant decrease in MALP-2-induced cytokine secretion. Collectively, these results suggest that Sulforaphane functions as a suppressor of the MALP-2-induced inflammatory response, not only by inhibiting the expression of cytokines and the induction of HO-1 but also by diminishing NF-κB activation in cultured monocytes and the lungs of mice.
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Affiliation(s)
- Luo Haodang
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - Qin Lianmei
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - Li Ranhui
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - Chen Liesong
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - He Jun
- Department of Clinical Laboratory, The Affiliated Nanhua Hospital of University of South China, Hengyang, 421001, China
| | - Zeng Yihua
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - Zhu Cuiming
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - Wu Yimou
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China
| | - You Xiaoxing
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, 421001, China.
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12
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Song Y, Nigro J, Yu L, Congiu M, Skinner N, Thompson A, Visvanathan K. Secreted and intracellular cytokines are complementary measures for human monocytes treated with Toll-like receptor agonists. J Immunol Methods 2018; 464:131-137. [PMID: 30395817 DOI: 10.1016/j.jim.2018.11.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/23/2018] [Accepted: 11/01/2018] [Indexed: 01/08/2023]
Abstract
Cytokine production by human peripheral blood mononuclear cells including monocytes, is frequently assessed by measuring secreted cytokines using enzyme linked immunosorbent assay (ELISA), whereby the total concentration of one cytokine of interest is obtained without information regarding the cell type responsible for making the cytokine. Cytokines can be retained inside the cell using protein transport inhibitors. Subsequent analysis by flow cytometry not only identifies the cell type producing the cytokine but can semi-quantitate the amount of cytokine produced by measuring the geometric mean fluorescence intensity (gMFI) and is amenable to analyzing more than one protein associated with the same cell (multiplexing). We hypothesized that a more comprehensive and biologically meaningful cytokine profile could be acquired by measuring both secreted and the retained intracellular cytokines in parallel cultures of magnetic-sorted CD14+ monocytes. Peripheral monocytes were isolated from 18 healthy donors and treated with standardized molecules that stimulate cytokine production; Toll-like receptor (TLR)4 agonist (lipopolysaccharide, LPS) or TLR7/8 agonist (R848). Pro-inflammatory cytokines (interleukin (IL)-6, IL-8 and tumour necrosis factor (TNF)) secreted into the culture medium were measured by ELISA. Parallel cultures were treated with LPS and R848 in the presence of brefeldin A (protein transport inhibitor) and the accumulated intracellular cytokines measured by flow cytometry. Each cytokine (IL-6/IL-8/TNF) gave a unique general pattern when secreted versus intracellular cytokine measurements (frequency and gMFI) were plotted to determine correlation. For monocytes treated with the TLR4 agonist, secreted IL-8 correlated with the frequency of IL-8 positive cells (R = 0.559, p = .016) and not with the amount (gMFI) of IL-8 per cell. In contrast, monocytes treated with the TLR7/8 agonist showed no correlation of secreted IL-8 with the frequency of IL-8 positive cells, but with this treatment secreted IL-6 was correlated with an increase in the frequency of IL-6 positive cells (R = 0.501, p = .034). TNF secretion from monocytes treated with either the TLR4 or TLR7/8 agonist did not correlate with the frequency or gMFI of TNF positive cells. However, there were significant correlations between the TLR4 and TLR7/8 induced TNF response (secreted and gMFI). We conclude that there are fundamental differences in secreted and intracellular IL-6/IL-8/TNF production after monocytes are treated with TLR agonists. Furthermore, secreted and intracellular cytokine analyses are complementary measures that should be used in parallel to explore inflammatory response and cytokine biology.
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Affiliation(s)
- Yang Song
- Department of Medicine, University of Melbourne, Melbourne, Australia; School of Medicine, Tsinghua University, Beijing, China
| | - Julie Nigro
- Department of Medicine, University of Melbourne, Melbourne, Australia; Immunology Research Centre, St. Vincent's Hospital, Melbourne, VIC, Australia
| | - Lijia Yu
- Department of Medicine, University of Melbourne, Melbourne, Australia; Immunology Research Centre, St. Vincent's Hospital, Melbourne, VIC, Australia
| | - Mario Congiu
- Department of Medicine, University of Melbourne, Melbourne, Australia; Immunology Research Centre, St. Vincent's Hospital, Melbourne, VIC, Australia
| | - Narelle Skinner
- Department of Medicine, University of Melbourne, Melbourne, Australia; Immunology Research Centre, St. Vincent's Hospital, Melbourne, VIC, Australia
| | - Alexander Thompson
- Department of Medicine, University of Melbourne, Melbourne, Australia; Department of Gastroenterology, St. Vincent's Hospital, Melbourne, VIC, Australia
| | - Kumar Visvanathan
- Department of Medicine, University of Melbourne, Melbourne, Australia; Immunology Research Centre, St. Vincent's Hospital, Melbourne, VIC, Australia.
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Chiang CLL, Kandalaft LE. In vivo cancer vaccination: Which dendritic cells to target and how? Cancer Treat Rev 2018; 71:88-101. [PMID: 30390423 DOI: 10.1016/j.ctrv.2018.10.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 10/20/2018] [Accepted: 10/22/2018] [Indexed: 12/24/2022]
Abstract
The field of cancer immunotherapy has been revolutionized with the use of immune checkpoint blockade antibodies such as anti-programmed cell death 1 protein (PD-1) and chimeric antigen receptor T cells. Significant clinical benefits are observed in different cancer types with these treatments. While considerable efforts are made in augmenting tumor-specific T cell responses with these therapies, other immunotherapies that actively stimulate endogenous anti-tumor T cells and generating long-term memory have received less attention. Given the high cost of cancer immunotherapies especially with chimeric antigen receptor T cells, not many patients will have access to such treatments. The next-generation of cancer immunotherapy could entail in vivo cancer vaccination to activate both the innate and adaptive anti-tumor responses. This could potentially be achieved via in vivo targeting of dendritic cells which are an indispensable link between the innate and adaptive immunities. Dendritic cells highly expressed toll-like receptors for recognizing and eliminating pathogens. Synthetic toll-like receptors agonists could be synthesized at a low cost and have shown promise in preclinical and clinical trials. As different subsets of human dendritic cells exist in the immune system, activation with different toll-like receptor agonists could exert profound effects on the quality and magnitude of anti-tumor T cell responses. Here, we reviewed the different subsets of human dendritic cells. Using published preclinical and clinical cancers studies available on PubMed, we discussed the use of clinically approved and emerging toll-like receptor agonists to activate dendritic cells in vivo for cancer immunotherapy. Finally, we searched www.clinicaltrials.gov and summarized the active cancer trials evaluating toll-like receptor agonists as an adjuvant.
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Affiliation(s)
- Cheryl Lai-Lai Chiang
- Ludwig Institute for Cancer Research, and Department of Oncology, University Hospital of Lausanne (CHUV), Lausanne CH-1066, Switzerland
| | - Lana E Kandalaft
- Ludwig Institute for Cancer Research, and Department of Oncology, University Hospital of Lausanne (CHUV), Lausanne CH-1066, Switzerland; Ovarian Cancer Research Center, University of Pennsylvania Medical Center, Smilow Translational Research Center 8th Floor, 186B, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA.
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14
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Borchsenius SN, Daks A, Fedorova O, Chernova O, Barlev NA. Effects of mycoplasma infection on the host organism response via p53/NF‐κB signaling. J Cell Physiol 2018; 234:171-180. [DOI: 10.1002/jcp.26781] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 04/23/2018] [Indexed: 12/31/2022]
Affiliation(s)
| | - Alexandra Daks
- Institute of Cytology RAS, Laboratory of Gene Expression Regulation Saint‐Petersburg Russia
| | - Olga Fedorova
- Institute of Cytology RAS, Laboratory of Gene Expression Regulation Saint‐Petersburg Russia
| | - Olga Chernova
- Kazan Scientific Center Kazan Institute of Biochemistry and Biophysics, Laboratory “Omics Technology”, Russian Academy of Sciences Kazan Russia
| | - Nickolai A. Barlev
- Institute of Cytology RAS, Laboratory of Gene Expression Regulation Saint‐Petersburg Russia
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15
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Christodoulides A, Gupta N, Yacoubian V, Maithel N, Parker J, Kelesidis T. The Role of Lipoproteins in Mycoplasma-Mediated Immunomodulation. Front Microbiol 2018; 9:1682. [PMID: 30108558 PMCID: PMC6080569 DOI: 10.3389/fmicb.2018.01682] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 07/05/2018] [Indexed: 01/16/2023] Open
Abstract
Mycoplasma infections, such as walking pneumonia or pelvic inflammatory diseases, are a major threat to public health. Despite their relatively small physical and genomic size, mycoplasmas are known to elicit strong host immune responses, generally inflammatory, while also being able to evade the immune system. The mycoplasma membrane is composed of approximately two-thirds protein and one-third lipid and contains several lipoproteins that are known to regulate host immune responses. Herein, the immunomodulatory effects of mycoplasma lipoproteins are reviewed. A better understanding of the immunomodulatory effects, both activating and evasive, of Mycoplasma surface lipoproteins will contribute to understanding mechanisms potentially relevant to mycoplasma disease vaccine development and treatment.
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Affiliation(s)
- Alexei Christodoulides
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Neha Gupta
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Vahe Yacoubian
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Neil Maithel
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Jordan Parker
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Theodoros Kelesidis
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
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16
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Sigola LB, Fuentes AL, Millis LM, Vapenik J, Murira A. Effects of Toll-like receptor ligands on RAW 264.7 macrophage morphology and zymosan phagocytosis. Tissue Cell 2016; 48:389-96. [PMID: 27157550 DOI: 10.1016/j.tice.2016.04.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 02/01/2016] [Accepted: 04/21/2016] [Indexed: 01/21/2023]
Abstract
In this study we compared the effects of the Toll-like receptor (TLR) ligands lipopolysaccharide (LPS), flagellin, the synthetic bacterial triacylated lipopeptide Pam3-Cys-Ser-Lys4 (Pam3CSK4), Polyinosinic:polycytidylic acid (Poly I:C), and macrophage-activating lipopeptide (MALP-2), which are TLR4, TLR5, TLR1/2, TLR3, and TLR2/6 agonists, respectively, on cell morphology and phagocytosis of zymosan particles, derived from Saccharomyces cerevisiae, and rich in fungal PAMPs including beta-glucan, mannose, and chitin. LPS, Pam3CSK4, and MALP-2 induced an activated macrophage phenotype and enhanced zymosan phagocytosis. In contrast, flagellin and Poly I:C, respectively, had little effect on cell morphology and phagocytosis. We examined the role of scavenger receptor A (SR-A) on zymosan phagocytosis. Cells cultured in medium alone expressed SR-A, and LPS induced further expression of the receptor. We also observed inhibitory effects of scavenger receptor antagonists fucoidan, dextran sulphate, and Polyinosinic (Poly I), respectively, on zymosan phagocytosis of cells in medium alone and those pre-treated with LPS. We conclude that exposure to specific TLR ligands impacts both cellular morphology and phagocytic capacity, and that scavenger receptors contribute to zymosan ingestion as well as LPS-induced augmentation of phagocytosis.
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Affiliation(s)
- Lynette B Sigola
- Biology Department, Douglas College, P.O. Box 2503, New Westminster B.C. V3L 5B2, Canada.
| | - Ana-Lucía Fuentes
- Biology Department, Douglas College, P.O. Box 2503, New Westminster B.C. V3L 5B2, Canada
| | - Leonard M Millis
- Biology Department, Douglas College, P.O. Box 2503, New Westminster B.C. V3L 5B2, Canada
| | - Jacqueline Vapenik
- Faculty of Health Sciences, Douglas College, P.O. Box 2503, New Westminster B.C. V3L 5B2, Canada
| | - Armstrong Murira
- Department of Molecular Biology and Biochemistry, Simon Fraser University, 8888 University Drive, Burnaby, B.C. V5A 1S6 Canada
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Müller C, Tufa DM, Chatterjee D, Mühlradt PF, Schmidt RE, Jacobs R. The TLR-2/TLR-6 agonist macrophage-activating lipopeptide-2 augments human NK cell cytotoxicity when PGE2 production by monocytes is inhibited by a COX-2 blocker. Cancer Immunol Immunother 2015; 64:1175-84. [PMID: 26036909 PMCID: PMC11028474 DOI: 10.1007/s00262-015-1723-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 05/24/2015] [Indexed: 12/29/2022]
Abstract
Macrophage-activating lipopeptide-2 (MALP-2) is a potent inducer of proinflammatory cytokine secretion by macrophages, monocytes, and dendritic cells. MALP-2 was reported to be involved in natural killer (NK) cell activation and ensuing tumor rejection. However, the mechanism of MALP-2-mediated NK cell activation remained unclear. Therefore, we studied the effects of MALP-2 on cultured human NK cells. We found that MALP-2 had no direct effect on NK cells. Instead, MALP-2 acted on monocytes and triggered the release of different molecules such as interleukin (IL)-1β, IL-6, IL-10, IL-12, IL-15, interferon gamma-induced protein (IP-10), and prostaglandin (PG)-E2. Our data show that monocyte-derived IP-10 could significantly induce NK cell cytotoxicity as long as the immunosuppression by PGE2 is specifically inhibited by cyclooxygenase (COX)-2 blockade. In summary, our results show that MALP-2-mediated stimulation of monocytes results in the production of several mediators which, depending on the prevailing conditions, affect the activity of NK cells in various ways. Hence, MALP-2 administration with concurrent blocking of COX-2 can be considered as a promising approach in MALP-2-based adjuvant tumor therapies.
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Affiliation(s)
- Christina Müller
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Dejene M. Tufa
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Debanjana Chatterjee
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | | | - Reinhold E. Schmidt
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Roland Jacobs
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
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Macrophage-activating lipopeptide-2 requires Mal and PI3K for efficient induction of heme oxygenase-1. PLoS One 2014; 9:e103433. [PMID: 25077631 PMCID: PMC4117634 DOI: 10.1371/journal.pone.0103433] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 06/29/2014] [Indexed: 11/19/2022] Open
Abstract
AIMS This study is to investigate the mechanisms by which macrophage-activating lipopeptide-2 (MALP-2) induces heme oxygenase (HO)-1, a cytoprotective enzyme that catalyzes the degradation of heme, in human monocytes. METHODS Human monocytic THP-1 cells were cultured for transient transfection with plasmids and stimulation with MALP-2 for indicative time intervals. After incubation with MALP-2, cells were collected and disrupted, before being tested for promoter activity using luciferase assay. For analysis of proteins, immunoreactive bands were detected using an enhanced chemiluminescence Western blotting system, and the band intensity was measured by densitometryic analysis. For the detection of co-immunoprecipitation, SDS-PAGE was performed and the membranes were probed using respective antibodies. To investigate the cellular localization of NF-E2-related factor 2 (Nrf2), cells underwent immunofluorescence staining and confocal microscopy, and were analyzed using electrophoretic mobility shift assay. RESULTS MALP-2-induced HO-1 expression and promoter activity were abrogated by transfection with dominant negative (DN) plasmids of TLR2 and TLR6, or their neutralizing antibodies. However, inhibition of MyD88 or transfection with the DN-MyD88 was insufficient to attenuate HO-1 expression. In contrast, mutation or silencing of MyD88 adapter-like (Mal) by DN-Mal or siRNA almost completely blocked HO-1 induction. Btk, c-Src and PI3K were also involved in MALP-2-induced HO-1 expression, as revealed by specific inhibitors LFM-A13, PP1 and LY294002, or by transfection with siRNA of c-Src. MALP-2-induced activation of PI3K was attenuated by transfection with DN mutant of Mal, and by pretreatment with LFM-A13 or PP1. Furthermore, MALP-2 stimulated the translocation of Nrf2 from the cytosol to the nucleus and Nrf2 binding to the ARE site in the HO-1 promoter, which could also be inhibited by pretreatment with a PI3K inhibitor, LY294002. CONCLUSIONS These results indicated that MALP-2 required TLR2/6, Btk, Mal and c-Src to activate PI3K, which in turn initiated the activation of Nrf2 for efficient HO-1 induction.
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Benedetti F, Davinelli S, Krishnan S, Gallo RC, Scapagnini G, Zella D, Curreli S. Sulfur compounds block MCP-1 production by Mycoplasma fermentans-infected macrophages through NF-κB inhibition. J Transl Med 2014; 12:145. [PMID: 24886588 PMCID: PMC4046042 DOI: 10.1186/1479-5876-12-145] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 05/22/2014] [Indexed: 12/04/2022] Open
Abstract
Background and aims Hydrogen sulfide (H2S), together with nitric oxide (NO) and carbon monoxide (CO), belongs to a family of endogenous signaling mediators termed “gasotransmitters”. Recent studies suggest that H2S modulates many cellular processes and it has been recognized to play a central role in inflammation, in the cardiovascular and nervous systems. By infecting monocytes/macrophages with Mycoplasma fermentans (M.F.), a well-known pro-inflammatory agent, we evaluated the effects of H2S. Methods M.F.-infected cells were analyzed by ELISA and real time RT-PCR to detect the M.F. effects on MCP-1 and on MMP-12 expression. The role of two different H2S donors (NaHS and GYY4137) on MF-infected cells was determined by treating infected cells with H2S and then testing the culture supernatants for MCP-1 and on MMP-12 production by ELISA assay. In order to identify the pathway/s mediating H2S- anti-inflammatory activity, cells were also treated with specific pharmaceutical inhibitors. Cytoplasmic and nuclear accumulation of NF-κB heterodimers was analyzed. Results We show that H2S was able to reduce the production of pro-inflammatory cytokine MCP-1, that was induced in monocytes/macrophages during M.F. infection. Moreover, MCP-1 was induced by M.F. through Toll-like receptor (TLR)-mediated nuclear factor-κB (NF-κB) activation, as demonstrated by the fact that TLR inhibitors TIRAP and MyD88 and NF-κB inhibitor IKK were able to block the cytokine production. In contrast H2S treatment of M.F. infected macrophages reduced nuclear accumulation of NF-κB heterodimer p65/p52. Conclusions Our data demonstrate that under the present conditions H2S is effective in reducing Mycoplasma-induced inflammation by targeting the NF-κB pathway. This supports further studies for possible clinical applications.
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Affiliation(s)
| | | | | | | | | | | | - Sabrina Curreli
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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20
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Mifsud EJ, Tan ACL, Jackson DC. TLR Agonists as Modulators of the Innate Immune Response and Their Potential as Agents Against Infectious Disease. Front Immunol 2014; 5:79. [PMID: 24624130 PMCID: PMC3939722 DOI: 10.3389/fimmu.2014.00079] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 02/13/2014] [Indexed: 12/28/2022] Open
Abstract
Immunotherapies that can either activate or suppress innate immune responses are being investigated as treatments against infectious diseases and the pathology they can cause. The objective of these therapies is to elicit protective immune responses thereby limiting the harm inflicted by the pathogen. The Toll-like receptor (TLR) signaling pathway plays critical roles in numerous host immune defenses and has been identified as an immunotherapeutic target against the consequences of infectious challenge. This review focuses on some of the recent advances being made in the development of TLR-ligands as potential prophylactic and/or therapeutic agents.
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Affiliation(s)
- Edin J. Mifsud
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Amabel C. L. Tan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - David C. Jackson
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
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He J, Wang S, Zeng Y, You X, Ma X, Wu N, Wu Y. Binding of CD14 to Mycoplasma genitalium-Derived Lipid-Associated Membrane Proteins Upregulates TNF-α. Inflammation 2013; 37:322-30. [DOI: 10.1007/s10753-013-9743-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Ma X, You X, Zeng Y, He J, Liu L, Deng Z, Jiang C, Wu H, Zhu C, Yu M, Wu Y. Mycoplasma fermentans MALP-2 induces heme oxygenase-1 expression via mitogen-activated protein kinases and Nrf2 pathways to modulate cyclooxygenase 2 expression in human monocytes. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2013; 20:827-34. [PMID: 23536693 PMCID: PMC3675981 DOI: 10.1128/cvi.00716-12] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 03/21/2013] [Indexed: 02/07/2023]
Abstract
Heme oxygenase-1 (HO-1) is a stress-inducible rate-limiting enzyme in heme degradation that confers cytoprotection against oxidative injury and performs a vital function in the maintenance of cell hemostasis. Increasing numbers of reports have indicated that mycoplasma-derived membrane lipoproteins/lipopeptides, such as macrophage-activating lipopeptide-2 (MALP-2), function as agents that stimulate the immune system by producing various inflammatory mediators, such as cytokines and cyclooxygenase 2 (COX-2), which play roles in the pathogenesis of inflammatory responses during mycoplasma infection. Here, we report that MALP-2 induced HO-1 mRNA and protein expression and upregulated HO-1 enzyme activity in THP-1 cells. Specific inhibitors of mitogen-activated protein kinases (MAPKs), SB203580, PD98059, and SP600125, significantly abolished HO-1 expression. In addition, MALP-2 also induced NF-E2-related factor 2 (Nrf2) translocation, and the silencing of Nrf2 expression in THP-1 cells decreased the levels of MALP-2-mediated HO-1 expression. Furthermore, COX-2 protein expression levels were upregulated in THP-1 cells in response to MALP-2, and transfection with small interfering RNAs of HO-1 significantly increased COX-2 accumulation. These results demonstrate that MALP-2 induces HO-1 expression via MAPKs and Nrf2 pathways and, furthermore, that MALP-2-induced COX-2 expression was modulated by HO-1 in THP-1 cells.
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Affiliation(s)
- Xiaohua Ma
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Xiaoxing You
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Yanhua Zeng
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Jun He
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory, The Affiliated Nanhua Hospital of University of South China, Hengyang, China
| | - Liangzhuan Liu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Zhongliang Deng
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Chuanhao Jiang
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Haiying Wu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Cuiming Zhu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Minjun Yu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Yimou Wu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
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Pfeifer R, Tschernig T, Lichte P, Dombroski D, Kobbe P, Pape HC. MALP-2 pre-treatment modulates systemic inflammation in hemorrhagic shock. JOURNAL OF INFLAMMATION-LONDON 2013; 10:17. [PMID: 23587413 PMCID: PMC3640975 DOI: 10.1186/1476-9255-10-17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2012] [Accepted: 04/10/2013] [Indexed: 11/24/2022]
Abstract
Background TLR-2 is expressed on the surface of leucocytes, lung and liver tissue and initiates the activation of immune response after interaction with components of the bacterial cell wall. In this experiment we investigated whether immunostimulation with TLR-2 agonists under conditions of sterile inflammation (hemorrhagic shock (HS)) may affect the immune response and remote organ inflammation. Methods Male C57/BL6 mice were subjected to standardized pressure-controlled HS (MAP of 35 mmHg for 90 minutes). The TLR-2 agonist macrophage-activated lipopeptide-2 (MALP-2) was administered (i.p.) either 12 hours prior to the induction of HS (Group MALP PT) or after the hypotensive period (90 minutes) (Group MALP T). After six hours, plasma cytokine levels (IL-6, KC, IL-10, and MCP-1) and lung and liver MPO activity were assessed. Results Pre-treatment with MALP-2 resulted in a significant attenuation of the systemic pro-inflammatory (IL-6) response (MALP PT: 0.83±0.2 ng/ml vs. MALP T: 1.7±0.09 ng/ml) (p<0.05). In comparison to the liver MPO activity, lung MPO levels in in group MALP PT did not show differences to levels measured in MALP T mice (1.200±200 ng/mg vs. 1.800±200 ng/mg). Conclusions After initial inflammation, MALP-2 pre-treatment was associated with attenuated systemic immune response after sterile stimulus. The TLR-2 agonist appears to affect sterile inflammation pathways. The exact mechanisms should be studied further to better understand these affects.
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Affiliation(s)
- Roman Pfeifer
- Department of Orthopaedic Trauma Surgery, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany.
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24
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Kiupel M, Desjardins DR, Lim A, Bolin C, Johnson-Delaney CA, Resau JH, Garner MM, Bolin SR. Mycoplasmosis in ferrets. Emerg Infect Dis 2013; 18:1763-70. [PMID: 23092744 PMCID: PMC3559160 DOI: 10.3201/eid1811.120072] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
A newly recognized respiratory disease of domestic ferrets is associated with a
novel Mycoplasma species. We report an outbreak of severe respiratory disease associated with a novel
Mycoplasma species in ferrets. During 2009–2012, a
respiratory disease characterized by nonproductive coughing affected
≈8,000 ferrets, 6–8 weeks of age, which had been imported from a
breeding facility in Canada. Almost 95% became ill, but almost none died.
Treatments temporarily decreased all clinical signs except cough. Postmortem
examinations of euthanized ferrets revealed bronchointerstitial pneumonia with
prominent hyperplasia of bronchiole-associated lymphoid tissue.
Immunohistochemical analysis with polyclonal antibody against Mycoplasma
bovis demonstrated intense staining along the bronchiolar brush
border. Bronchoalveolar lavage samples from 12 affected ferrets yielded
fast-growing, glucose-fermenting mycoplasmas. Nucleic acid sequence analysis of
PCR-derived amplicons from portions of the 16S rDNA and RNA polymerase B genes
failed to identify the mycoplasmas but showed that they were most similar to
M. molare and M. lagogenitalium. These
findings indicate a causal association between the novel
Mycoplasma species and the newly recognized pulmonary
disease.
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Affiliation(s)
- Matti Kiupel
- Diagnostic Center for Population and Animal Health, Michigan State University, Lansing, MI 48910, USA.
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25
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Boje A, Moesby L, Timm M, Hansen EW. Immunomodulatory effects of testosterone evaluated in all-trans retinoic acid differentiated HL-60 cells, granulocytes, and monocytes. Int Immunopharmacol 2012; 12:573-9. [PMID: 22366056 DOI: 10.1016/j.intimp.2012.02.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 01/28/2012] [Accepted: 02/13/2012] [Indexed: 11/17/2022]
Abstract
The sex hormones are known to affect innate immunity in humans. In this study we evaluated the immunomodulatory effects of testosterone in a model system comprising of all-trans retinoic acid differentiated HL-60 cells, and confirmed the results in human granulocytes and monocytes. Results showed that testosterone at pharmacological doses reduced the production of interleukin-8 and reactive oxygen species from differentiated HL-60 cells in a concentration dependent manner without affecting phagocytosis. The cells were stimulated with zymosan, lipopolysaccharide, or Bacillus subtilis. At the highest concentration of testosterone (120 μM), interleukin-8 secretion was reduced 42-80%, and production of reactive oxygen species was reduced 32-46%. Flutamide, an antagonist of the classical intracellular androgen receptor, was unable to antagonize the immunosuppressive effect of testosterone. We further demonstrated that the suppressive effect of testosterone has a short onset time. Our results suggest that testosterone affects the fast operating membrane bound androgen receptor or a rapid acting enzyme system. Testosterone, at pharmacological doses, was also shown to suppress generation of reactive oxygen species and interleukin-8 in human granulocytes and monocytes, respectively, to a similar extent as observed in differentiated HL-60 cells.
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Affiliation(s)
- Alex Boje
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
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26
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Quentmeier H, Eberth S, Romani J, Weich HA, Zaborski M, Drexler HG. DNA methylation regulates expression of VEGF-R2 (KDR) and VEGF-R3 (FLT4). BMC Cancer 2012; 12:19. [PMID: 22251800 PMCID: PMC3297533 DOI: 10.1186/1471-2407-12-19] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Accepted: 01/17/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Vascular Endothelial Growth Factors (VEGFs) and their receptors (VEGF-Rs) are important regulators for angiogenesis and lymphangiogenesis. VEGFs and VEGF-Rs are not only expressed on endothelial cells but also on various subtypes of solid tumors and leukemias contributing to the growth of the malignant cells. This study was performed to examine whether VEGF-R2 (KDR) and VEGF-R3 (FLT4) are regulated by DNA methylation. METHODS Real-time (RT) PCR analysis was performed to quantify KDR and FLT4 expression in some ninety leukemia/lymphoma cell lines, human umbilical vein endothelial cells (HUVECs) and dermal microvascular endothelial cells (HDMECs). Western blot analyses and flow cytometric analyses confirmed results at the protein level. After bisulfite conversion of DNA we determined the methylation status of KDR and FLT4 by DNA sequencing and by methylation specific PCR (MSP). Western blot analyses were performed to examine the effect of VEGF-C on p42/44 MAPK activation. RESULTS Expression of KDR and FLT4 was observed in cell lines from various leukemic entities, but not in lymphoma cell lines: 16% (10/62) of the leukemia cell lines expressed KDR, 42% (27/65) were FLT4 positive. None of thirty cell lines representing six lymphoma subtypes showed more than marginal expression of KDR or FLT4. Western blot analyses confirmed KDR and FLT4 protein expression in HDMECs, HUVECs and in cell lines with high VEGF-R mRNA levels. Mature VEGF-C induced p42/44 MAPK activation in the KDR- /FLT4(+) cell line OCI-AML1 verifying the model character of this cell line for VEGF-C signal transduction studies. Bisulfite sequencing and MSP revealed that GpG islands in the promoter regions of KDR and FLT4 were unmethylated in HUVECs, HDMECs and KDR(+) and FLT4(+) cell lines, whereas methylated cell lines did not express these genes. In hypermethylated cell lines, KDR and FLT4 were re-inducible by treatment with the DNA demethylating agent 5-Aza-2'deoxycytidine, confirming epigenetic regulation of both genes. CONCLUSIONS Our data show that VEGF-Rs KDR and FLT4 are silenced by DNA methylation. However, if the promoters are unmethylated, other factors (e.g. transactivation factors) determine the extent of KDR and FLT4 expression.
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Affiliation(s)
- Hilmar Quentmeier
- Department of Human and Animal Cell Cultures, German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany.
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Schill T, Schön MP, Pletz N, Emmert S, Schön M. Stimulation of pulmonary immune responses by the TLR2/6 agonist MALP-2 and effect on melanoma metastasis to the lung. Exp Dermatol 2011; 21:91-8. [PMID: 22044500 DOI: 10.1111/j.1600-0625.2011.01386.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Given that metastasized melanoma is a fatal disease in most cases, it is tempting to develop strategies to a priori prevent metastasis. We have stimulated the pulmonary innate immune system by macrophage-activating lipopeptide-2 (MALP-2), a specific agonist at Toll-like receptor (TLR) 2/6, and investigated its impact on experimental melanoma metastasis. In C57BL/6 mice, intratracheal application of MALP-2 induced a profound influx of neutrophils and macrophages into the lung, which peaked after 24 h (sixfold increase) and returned to baseline within 72 h. Further analysis revealed that MALP-2 also markedly induced VCAM-1 expression on pulmonary blood vessels. In vitro experiments demonstrated that this adhesion molecule mediates binding of B16F10 melanoma cells. Furthermore, in vivo or in vitro treatment with MALP-2 did not significantly affect the ability of immune cells to lyse melanoma cells. As a consequence, notwithstanding the profound pulmonary immune response induction and in contrast to conclusions drawn from some previous publications, the net extent of experimental metastasis did not change significantly, regardless of the application regimen of MALP-2 prior to, concomitant with or after tumor cell inoculation. Melanoma cells stably transfected with green fluorescent protein allowed tracking of early events after tumor cell dissemination and showed that MALP-2-mediated TLR2/6 activation did not interfere with pulmonary melanoma cell arrest. Likewise, boosting the immune induction after establishment of metastases did not change the clinical outcome. These unexpected results vividly counsel caution regarding predictions of immunomodulating therapies, as multiple intertwined effects may influence the net outcome.
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Affiliation(s)
- Tillmann Schill
- Department of Dermatology, Venereology and Allergology, Georg August University, Göttingen, Germany
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Chiang CLL, Kandalaft LE, Coukos G. Adjuvants for enhancing the immunogenicity of whole tumor cell vaccines. Int Rev Immunol 2011; 30:150-82. [PMID: 21557641 DOI: 10.3109/08830185.2011.572210] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Whole tumor cell lysates can serve as excellent multivalent vaccines for priming tumor-specific CD8(+) and CD4(+) T cells. Whole cell vaccines can be prepared with hypochlorous acid oxidation, UVB-irradiation and repeat cycles of freeze and thaw. One major obstacle to successful immunotherapy is breaking self-tolerance to tumor antigens. Clinically approved adjuvants, including Montanide™ ISA-51 and 720, and keyhole-limpet proteins can be used to enhance tumor cell immunogenicity by stimulating both humoral and cellular anti-tumor responses. Other potential adjuvants, such as Toll-like receptor agonists (e.g., CpG, MPLA and PolyI:C), and cytokines (e.g., granulocyte-macrophage colony stimulating factor), have also been investigated.
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Affiliation(s)
- Cheryl Lai-Lai Chiang
- Ovarian Cancer Research Center, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104-6142, USA
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Mukherjee R, McQuinn TC, Dugan MA, Saul JP, Spinale FG. Cardiac function and circulating cytokines after endotoxin exposure in neonatal mice. Pediatr Res 2010; 68:381-6. [PMID: 20613681 PMCID: PMC3086526 DOI: 10.1203/pdr.0b013e3181efbe10] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Complications after cardiac surgery in neonates can occur because of activation of the inflammatory system. This study used lipopolysaccharide (LPS) endotoxin exposure to cause cytokine activation in neonatal mice and examine left ventricular (LV) function and the effects of antioxidant treatment on cytokine levels. Neonatal mice (6 d old) were injected with either 25 mg/kg LPS (n = 13) or PBS (n = 14), and LV function (echocardiography) was measured at 4 h. Plasma levels of TNF-α, IL-4, IL-6, and IL-10 were measured at 30 min, 1, 2, and 4 h after injection (n = 5 mice per group). Effects of pretreatment with N-acetylcysteine (NAC, 50 mg/kg) on cytokine levels were examined at 2 and 4 h after PBS or LPS (n = 5 mice per group). Four hours after LPS, heart rate was increased (434 ± 14 versus 405 ± 14 bpm, p < 0.05). LV end-diastolic dimension and ejection time were reduced with LPS (both p < 0.05). LPS exposure increased plasma TNF-α, IL-6, and IL-10 levels. NAC pretreatment attenuated the increases in TNF-α and IL-6 levels, but augmented IL-10 levels at 2 h post-LPS. LPS exposure altered cardiac performance and activated cytokines in neonatal mice, which may be ameliorated using antioxidants.
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Affiliation(s)
- Rupak Mukherjee
- Division of Cardiothoracic Surgery, Medical University of South Carolina, Charleston, SC 29425, USA.
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30
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Abstract
It is still a major problem to achieve successful therapy in polymicrobial sepsis. Stimulation of the innate immune system via Toll-like receptors (TLRs) 2 and 6 had beneficial effects on chronic inflammatory disorders and a severe peritonitis model when administered 4 days before induction. In the present study, the hypothesis whether the TLR-2 and TLR-6 pathway can also be used as a therapeutic agent parallel to sepsis induction and several hours after the induction was tested. Therefore, the TLR-2 and TLR-6 agonist macrophage-activating lipopeptide 2 (MALP-2) was applied simultaneous to cecal ligation and puncture-sepsis induction and 6 h thereafter. Vehicle-treated animals served as controls. Survival, activity, cytokine levels at different time points, and pulmonary neutrophil infiltration were determined. Improved survival was found after both MALP-2 treatments in comparison with untreated controls. The treatment resulted in reduced monocyte chemotactic protein 1 levels in the plasma; furthermore, pulmonary infiltration by neutrophils was decreased. These results demonstrate a beneficial effect of MALP-2 as a therapeutic agent in polymicrobial sepsis in the cecal ligation and puncture mouse model.
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Switalla S, Lauenstein L, Prenzler F, Knothe S, Förster C, Fieguth HG, Pfennig O, Schaumann F, Martin C, Guzman CA, Ebensen T, Müller M, Hohlfeld JM, Krug N, Braun A, Sewald K. Natural innate cytokine response to immunomodulators and adjuvants in human precision-cut lung slices. Toxicol Appl Pharmacol 2010; 246:107-15. [PMID: 20434477 DOI: 10.1016/j.taap.2010.04.010] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 04/13/2010] [Accepted: 04/14/2010] [Indexed: 11/16/2022]
Abstract
Prediction of lung innate immune responses is critical for developing new drugs. Well-established immune modulators like lipopolysaccharides (LPS) can elicit a wide range of immunological effects. They are involved in acute lung diseases such as infections or chronic airway diseases such as COPD. LPS has a strong adjuvant activity, but its pyrogenicity has precluded therapeutic use. The bacterial lipopeptide MALP-2 and its synthetic derivative BPPcysMPEG are better tolerated. We have compared the effects of LPS and BPPcysMPEG on the innate immune response in human precision-cut lung slices. Cytokine responses were quantified by ELISA, Luminex, and Meso Scale Discovery technology. The initial response to LPS and BPPcysMPEG was marked by coordinated and significant release of the mediators IL-1β, MIP-1β, and IL-10 in viable PCLS. Stimulation of lung tissue with BPPcysMPEG, however, induced a differential response. While LPS upregulated IFN-γ, BPPcysMPEG did not. This traces back to their signaling pathways via TLR4 and TLR2/6. The calculated exposure doses selected for LPS covered ranges occurring in clinical studies with human beings. Correlation of obtained data with data from human BAL fluid after segmental provocation with endotoxin showed highly comparable effects, resulting in a coefficient of correlation >0.9. Furthermore, we were interested in modulating the response to LPS. Using dexamethasone as an immunosuppressive drug for anti-inflammatory therapy, we found a significant reduction of GM-CSF, IL-1β, and IFN-γ. The PCLS-model offers the unique opportunity to test the efficacy and toxicity of biological agents intended for use by inhalation in a complex setting in humans.
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Affiliation(s)
- S Switalla
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - L Lauenstein
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - F Prenzler
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - S Knothe
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - C Förster
- Klinikum Region Hannover (KRH), Hannover, Germany
| | - H-G Fieguth
- Klinikum Region Hannover (KRH), Hannover, Germany
| | - O Pfennig
- Klinikum Region Hannover (KRH), Hannover, Germany
| | - F Schaumann
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - C Martin
- Institute of Pharmacology and Toxicology, RWTH Aachen, Wendlingweg 2, 52074 Aachen, Germany
| | - C A Guzman
- Helmholtz Centre for Infection Research, Department of Vaccinology and Applied Microbiology, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - T Ebensen
- Helmholtz Centre for Infection Research, Department of Vaccinology and Applied Microbiology, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - M Müller
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - J M Hohlfeld
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - N Krug
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - A Braun
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
| | - K Sewald
- Fraunhofer Institute for Toxicology and Experimental Medicine, Division of Immunology, Allergy and Airway Research, Nikolai-Fuchs-Str. 1, D-30625 Hannover, Germany
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Kerber-Momot T, Leemhuis D, Lührmann A, Munder A, Tümmler B, Pabst R, Tschernig T. Beneficial effects of TLR-2/6 ligation in pulmonary bacterial infection and immunization with Pseudomonas aeruginosa. Inflammation 2010; 33:58-64. [PMID: 19844782 DOI: 10.1007/s10753-009-9158-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Pseudomonas aeruginosa (P. aeruginosa) is the major pathogen in nosocomial and life-threatening infections of immunocompromised or critically ill patients. The macrophage-activating lipopeptide-2 (MALP-2) activates the immune system via Toll-like receptors (TLR) 2 and 6 and leads to an accumulation of immune cells in lungs of young adult (8-10 week old) rats after intratracheal application. This is characterized by a high increase of granulocyte numbers in the BAL 24 h after MALP-2 treatment. It was hypothesized that MALP-2 may have a positive effect on the clinical course of an experimental infection. Therefore, rats were treated with MALP-2 at different time points following an infection with P. aeruginosa. The effect of MALP-2 in combination with immunization with inactivated P. aeruginosa was also investigated. Rats (n = 10) were infected intratracheally (i.t.) with 1 x 10(8) CFU P. aeruginosa on day 0. They were treated on day -3, -1, 0 and +1 with 2.5 microg MALP-2 or the vehicle i.t. In additional experiments, rats were immunized on day -21 and -14 with 1 x 10(8) CFU of inactivated P. aeruginosa bacteria and 2.5 microg MALP-2 or vehicle with 1 x 10(8) CFU of inactivated bacteria and isopropanol. The clinical score, rectal temperature and weight of the rats were checked in both treatment and immunization experiments twice a day. On day 2 they were sacrificed, CFU were determined in the left lung, the right lung being used for histology. In the group treated with MALP-2 1 day prior to infection significant effects were seen: The rectal temperature was about 2 degrees C higher in comparison to the controls at 6 h and also 1 day after infection. Both the symptoms of the infection and the weight loss were significantly reduced. In addition, the CFU and the inflammation in the lung tissue were significantly lower. These effects were not observed after treatment on day -3, 0 or +1. The MALP-2 enhanced immunization only resulted in a tendency to clinical improvement. In conclusion, local immunostimulation at the appropriate time can enhance the host defense against bacteria in the lung.
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Affiliation(s)
- Tanja Kerber-Momot
- Institute of Functional and Applied Anatomy, Medical School Hannover, Carl-Neuberg Str 1, 30625, Hannover, Germany.
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Palma C, Iona E, Ebensen T, Guzman CA, Cassone A. The toll-like receptor 2/6 ligand MALP-2 reduces the viability of Mycobacterium tuberculosis in murine macrophages. Open Microbiol J 2009; 3:47-52. [PMID: 19471610 PMCID: PMC2685717 DOI: 10.2174/1874285800903010047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2009] [Revised: 03/17/2009] [Accepted: 03/18/2009] [Indexed: 11/24/2022] Open
Abstract
Toll-like receptors (TLRs) sense conserved structures of pathogens and influence macrophage functions. Here we investigated the impact of TLR signaling on the modulation of macrophage defense mechanisms against infection of Mycobacterium tuberculosis (MTB), the causative agent of tuberculosis. We found that a synthetic derivative of the TLR2/6 agonist MALP-2 and the potent TLR4 agonist lipopolysaccharide inhibited the intracellular growth of MTB in murine macrophages. Likely the microbicidal effect was mediated by production of nitric oxide while it is still unclear the role played by release of TNF-α , IL-6, MIP-1β and IL-10. These results suggest that the activation of microbicidal defense via TLR ligands is an appealing target for the establishment on immune intervention against tuberculosis.
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Affiliation(s)
- Carla Palma
- Department of Infectious, Parasitic and Immune-mediated Diseases, Istituto Superiore di Sanità, Rome, Italy.
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Reppe K, Tschernig T, Lührmann A, van Laak V, Grote K, Zemlin MV, Gutbier B, Müller HC, Kursar M, Schütte H, Rosseau S, Pabst R, Suttorp N, Witzenrath M. Immunostimulation with Macrophage-Activating Lipopeptide-2 Increased Survival in Murine Pneumonia. Am J Respir Cell Mol Biol 2009; 40:474-81. [DOI: 10.1165/rcmb.2008-0071oc] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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Efficient immune responses against Intimin and EspB of enterohaemorragic Escherichia coli after intranasal vaccination using the TLR2/6 agonist MALP-2 as adjuvant. Vaccine 2008; 26:5662-7. [DOI: 10.1016/j.vaccine.2008.07.027] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 07/06/2008] [Accepted: 07/14/2008] [Indexed: 01/07/2023]
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36
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Henjakovic M, Sewald K, Switalla S, Kaiser D, Müller M, Veres TZ, Martin C, Uhlig S, Krug N, Braun A. Ex vivo testing of immune responses in precision-cut lung slices. Toxicol Appl Pharmacol 2008; 231:68-76. [PMID: 18504053 DOI: 10.1016/j.taap.2008.04.003] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Revised: 04/02/2008] [Accepted: 04/02/2008] [Indexed: 10/24/2022]
Abstract
The aim of this study was the establishment of precision-cut lung slices (PCLS) as a suitable ex vivo alternative approach to animal experiments for investigation of immunomodulatory effects. For this purpose we characterized the changes of cytokine production and the expression of cell surface markers after incubation of PCLS with immunoactive substances lipopolysaccharide (LPS), macrophage-activating lipopeptide-2 (MALP-2), interferon gamma (IFNgamma), and dexamethasone. Viability of PCLS from wild-type and CD11c-enhanced yellow fluorescent protein (CD11-EYFP)-transgenic mice was controlled by measurement of lactate dehydrogenase (LDH) enzyme activity and live/dead fluorescence staining using confocal microscopy. Cytokines and chemokines were detected with Luminex technology and ELISA. Antigen presenting cell (APC) markers were investigated in living mouse PCLS in situ using confocal microscopy. LPS triggered profound pro-inflammatory effects in PCLS. Dexamethasone prevented LPS-induced production of cytokines/chemokines such as interleukin (IL)-5, IL-1alpha, TNFalpha, IL-12(p40), and RANTES in PCLS. Surface expression of MHC class II, CD40, and CD11c, but not CD86 was present in APCs of naive PCLS. Incubation with LPS enhanced specifically the expression of MHC class II on diverse cells. MALP-2 only failed to alter cytokine or chemokine levels, but was highly effective in combination with IFNgamma resulting in increased levels of TNFalpha, IL-12(p40), RANTES, and IL-1alpha. PCLS showed characteristic responses to typical pro-inflammatory stimuli and may thus provide a suitable ex vivo technique to predict the immunomodulatory potency of inhaled substances.
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Affiliation(s)
- M Henjakovic
- Fraunhofer Institute of Toxicology and Experimental Medicine, Department of Immunology, Allergology and Immunotoxicology, Nikolai-Fuchs-Str. 1, 30625 Hannover, Germany
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A novel cerebral microangiopathy with endothelial cell atypia and multifocal white matter lesions: a direct mycoplasmal infection? J Neuropathol Exp Neurol 2008; 66:1100-17. [PMID: 18090919 DOI: 10.1097/nen.0b013e31815c1e09] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
We present 3 sporadic cases of a subacute to chronic, progressive motor (i.e. weakness, ataxia, spasticity, dysarthria, and dysphagia) and cognitive disorder in adults of both sexes, without proven immunocompromise or malignancy. Neuroimaging studies revealed tiny calcifications with atrophy of the cerebrum, pons, and midbrain in 1 patient, cerebral atrophy in another, and cerebral atrophy and periventricular white matter hyperintensities in the third. Clinical diagnoses included cortico-pontine-cerebellar degeneration, mixed neurodegenerative disorder, progressive supranuclear palsy, diffuse Lewy body disease, and Lyme disease. One atrophic brain revealed widely disseminated, millimeter-sized gray lesions in cerebral white matter and obscured anatomic markings of the basis pontis. The most conspicuous microscopic feature in all was capillaries with focally piled up endothelial nuclei, some of which appeared to be multinucleated, or enlarged, hyperchromatic crescentic single nuclei. Although seen mostly without associated damage, they were also noted with white matter lesions displaying vacuolation, demyelination, spheroids, necrosis, vascular fibrosis, and mineralization; these were most severe in the basis pontis. Immunostains and probes to herpes simplex virus-I, -II, and -8; adenovirus, cytomegalovirus, varicella-zoster, Epstein-Barr virus, measles, JC virus, and herpes hominis virus-6 were negative. Electron microscopy revealed no virions in endothelial cells with multilobed or multiple nuclei and duplicated basal laminae. However, mycoplasma-like bodies, mostly 400 to 600 nm in size, were found in endothelial cell cytoplasm and capillary lumina. Platelets adhered to affected endothelial cells. Polymerase chain reaction and immunohistochemistry of fixed samples for Mycoplasma fermentans were negative; other species of Mycoplasma remain viable pathogenic candidates.
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Shibata KI. [Immunobiological activities of microbial lipoproteins/lipopeptides and their recognition by the innate immune system]. Nihon Saikingaku Zasshi 2007; 62:363-74. [PMID: 17892000 DOI: 10.3412/jsb.62.363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Ken-ichiro Shibata
- Laboratory of Oral Molecular Microbiology, Department of Oral Pathobiological Science, Hokkaido University Graduate School of Dental Medicine
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Schmidt J, Welsch T, Jäger D, Mühlradt PF, Büchler MW, Märten A. Intratumoural injection of the toll-like receptor-2/6 agonist 'macrophage-activating lipopeptide-2' in patients with pancreatic carcinoma: a phase I/II trial. Br J Cancer 2007; 97:598-604. [PMID: 17667928 PMCID: PMC2360370 DOI: 10.1038/sj.bjc.6603903] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2007] [Revised: 06/26/2007] [Accepted: 06/28/2007] [Indexed: 01/02/2023] Open
Abstract
This phase I/II trial examined safety and efficacy of the toll-like receptor 2/6 agonist MALP-2 in combination with gemcitabine in patients with incompletely resectable pancreas carcinomas. MALP-2 is a toll-like receptor 2/6 agonist, acts as an immunological adjuvant, and has been described recently to prolong survival in a mouse model of an orthotopic, syngeneic pancreas tumour. Male and female patients with incompletely resectable pancreas carcinomas were eligible while those with R0 or R1 resections or with peritoneal carcinosis were excluded. Ten patients were injected intratumourally during surgery with 20-30 microg MALP-2 followed by postoperative chemotherapy. Samples were taken from peripheral blood and wound secretion, and assayed for cell content, cytokine and CRP levels, and NK activity. An MALP-2 dose of 20 microg was well tolerated. Clear signs of local MALP-2 effects were presented by the influx of lymphocytes and monocytes in wound secretions, and abolishment of inhibition of NK activity. The actual mean survival is 17.1+/-4.2 months; the median survival being 9.3 months. Two patients are still alive after 31 months. Up to 20 microg MALP-2 was well tolerated, and no systemic side effects were noted. The mean survival of 17.1 months is remarkably high.
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Affiliation(s)
- J Schmidt
- Department of Surgery, University of Heidelberg, Heidelberg 69120, Germany
| | - T Welsch
- Department of Surgery, University of Heidelberg, Heidelberg 69120, Germany
| | - D Jäger
- National Centre for Tumour Diseases, University of Heidelberg, Heidelberg 69120, Germany
| | - P F Mühlradt
- Wound Healing Research Group, BioTec Gründerzentrum, Braunschweig 38124, Germany
| | - M W Büchler
- Department of Surgery, University of Heidelberg, Heidelberg 69120, Germany
| | - A Märten
- Department of Surgery, University of Heidelberg, Heidelberg 69120, Germany
- National Centre for Tumour Diseases, University of Heidelberg, Heidelberg 69120, Germany
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Cole M, Cox S, Inman E, Chan C, Mana M, Helgerson S, Tawil B. Fibrin as a delivery vehicle for active macrophage activator lipoprotein-2 peptide: in vitro studies. Wound Repair Regen 2007; 15:521-9. [PMID: 17650096 DOI: 10.1111/j.1524-475x.2007.00260.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fibrin sealants have been used in hemostasis and tissue sealing for over 25 years and recent studies have shown them to be an ideal delivery vehicle for cells and bioactive substances. We examined the use of fibrin as a delivery vehicle for the macrophage activator lipoprotein peptide (MALP)-2. MALP-2, secreted by mycoplasma, plays an important role in an early influx of leukocytes and infiltration by monocytes and their subsequent activation into macrophages as detected by their secretion of cytokines and chemoattractants. We first showed that MALP-2 activated several monocytic cell lines by increasing the expression of cytokines and chemoattractants in these cells. Furthermore, using a reverse transcription-polymerase chain reaction approach, we found that MALP-2 affected the gene expression of its own receptors: TLR2 and TLR4 in various cell types including fibroblasts, keratinocytes, and endothelial cells. Furthermore, the conditioned medium, containing secreted cytokines and chemoattractants, collected from monocytes treated with MALP-2 enhanced fibroblast migration using a standard wound culture assay. Next, we examined MALP-2's effect on the human monocyte cell line when it is mixed with fibrin. Monocytes seeded on three-dimensional fibrin containing MALP-2 secreted more cytokines such as interleukin-6, tumor necrosis factor-alpha, and chemoattractants such as macrophage inflammatory protein 1 alpha and monocyte chemoattractant protein 1 when compared with monocytes seeded on three-dimensional fibrin in the absence of MALP-2. This study supports the use of fibrin to deliver MALP-2, and possibly other peptides, in an active form that might enhance wound healing.
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Affiliation(s)
- Marietta Cole
- Baxter Healthcare Corporation, BioSurgery Division, Westlake Village, CA 91362, USA
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Wilde I, Lotz S, Engelmann D, Starke A, van Zandbergen G, Solbach W, Laskay T. Direct stimulatory effects of the TLR2/6 ligand bacterial lipopeptide MALP-2 on neutrophil granulocytes. Med Microbiol Immunol 2006; 196:61-71. [PMID: 17006695 DOI: 10.1007/s00430-006-0027-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Indexed: 11/26/2022]
Abstract
Bacterial lipopeptides represent a group of bacterial compounds able to trigger the functions of cells of the innate immune response. Whereas diacylated lipopeptides are recognized by TLR2/6 dimers, triacylated lipopeptides were shown to act via TLR2/1 dimers. Although several previous studies dealt with the effect of the TLR2/1 ligand Pam(3)CysSK(4) on neutrophil granulocytes (PMN), it is still not clear whether TLR2/6 ligand lipopeptides can directly influence PMN functions. In the present study we used highly purified human neutrophils to investigate the direct effects of the diacylated mycoplasmal macrophage activating lipopeptide-2 (MALP-2) on the function of neutrophil granulocytes. After exposure to 10 ng/ml MALP-2 neutrophils acquired activated cell shape, secreted IL-8 and MIP-1beta and their phagocytic capacity was enhanced. Analysis of cell surface activation markers confirmed the activating effect of MALP-2, the expression of CD62L was downregulated whereas CD11b was upregulated on PMN after exposure to MALP-2. The constitutive apoptosis of PMN was inhibited after exposure to MALP-2. However, MALP-2 exerted only a short-term effect on the apoptosis of resting neutrophils, a longer lasting effect was observed after transendothelial migration. MALP-2 did not directly induce the production of reactive oxygen intermediates but primed PMN for a fMLP-induced oxidative burst. The migration of neutrophils was enhanced after treatment with MALP-2. This was due, however, to a chemokinetic rather than to a chemotactic effect. Pam(3)CysSK(4) also activated PMN, but in comparison to MALP-2, at higher concentrations. These findings suggest that diacylated lipopeptides are important microbial structures recognized by and acting on neutrophil granulocytes.
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Affiliation(s)
- Inga Wilde
- Institute of Medical Microbiology and Hygiene, University of Luebeck, Ratzeburger Allee 160, 23538 Lubeck, Germany
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Gerlic M, Horowitz J, Farkash S, Horowitz S. The inhibitory effect of Mycoplasma fermentans on tumour necrosis factor (TNF)-alpha-induced apoptosis resides in the membrane lipoproteins. Cell Microbiol 2006; 9:142-53. [PMID: 16889623 DOI: 10.1111/j.1462-5822.2006.00774.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mycoplasma have been shown to be involved in the alteration of several eukaryotic cell functions, such as cytokine production, gene expression and more. We have previously reported that infection of human myelomonocytic U937 cell line with live Mycoplasma fermentans (M. fermentans) inhibited tumour necrosis factor (TNF-alpha)-induced apoptosis. Mycoplasmal membrane lipoproteins are considered to be the most potent initiators of inflammatory reactions in mycoplasmal infections. The aim of this study was to clarify whether the inhibitory effect on TNFalpha-induced apoptosis is exerted by M. fermentans lipoproteins (LPMf). A significant reduction in TNFalpha-induced apoptosis was demonstrated by stimulation of U937 cells with M. fermentans total proteins, LPMf or MALP-2 (M. fermentans synthetic lipopeptide), but not with M. fermentans hydrophilic protein preparation (AqMf). To investigate the mechanism of M. fermentans antiapoptotic effect, the reduction of mitochondrial transmembrane potential (delta psi m) was measured. M. fermentans total proteins LPMf and MALP-2, but not AqMf, inhibited the reduction of delta psi m. In addition, M. fermentans total proteins LPMf and MALP-2, but not AqMf, downregulated the formation of active caspase-8. NF-kappaB was transactivated in cells treated with M. fermentans lipoproteins, and was essential for host cell survival, but not for the inhibition of TNFalpha-induced apoptosis by LPMf. Our results suggest that the inhibitory effect exerted by M. fermentans on TNFalpha-induced apoptosis in U937 cells is due to the membrane lipoproteins of these bacteria.
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Affiliation(s)
- Motti Gerlic
- Department of Microbiology and Immunology, Faculty of Health Sciences, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel, 84105
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Peltier MR, Freeman AJ, Mu HH, Cole BC. Characterization and Partial Purification of a Macrophage-Stimulating Factor from Mycoplasma hominis. Am J Reprod Immunol 2005; 54:342-51. [PMID: 16305659 DOI: 10.1111/j.1600-0897.2005.00316.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
PROBLEM Mycoplasma hominis is one of the most common pathogens of the genital tract and is associated with increased production of proinflammatory cytokines in reproductive tissues during preterm labor. The mechanism by which M. hominis, an organism lacking cell walls, increases the production of proinflammatory cytokines is unknown. METHOD OF STUDY We characterized and purified a macrophage-activating factor from this organism. RESULTS Extraction of whole organisms with Triton-X-114 demonstrated that the activity was primarily associated with the detergent phase. Macrophage-stimulating activity (MSA) of detergent extracts of M. hominis was not inhibited by polymyxin B or heating but was completely abrogated by alkaline hydrolysis and partially reduced by proteinase K digestion. Further experiments that utilized Toll-like receptor (TLR)-2- and TLR-4-transfected cells, revealed that the detergent extracts activate TLR-2 but not TLR-4 signal transduction. Purification of the activity using preparative SDS-PAGE and reverse phase chromatography experiments led to the isolation of a 29-kDa protein. CONCLUSIONS These experiments suggest that the MSA of M. hominis is due to a lipophillic factor that interacts with TLR-2 rather than TLR-4 (as does lipopolysaccharide), to increase tumor necrosis factor (TNF)-alpha by macrophages. It is known that TNF-alpha can cause preterm labor and intrauterine fetal death and that it is upregulated in amniotic fluid samples infected with M. hominis.
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Affiliation(s)
- Morgan R Peltier
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of Medicine and Dentistry-Robert Wood Johnson Medical School, New Brunswick, NJ 08901, USA.
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Lührmann A, Tschernig T, Pabst R, Niewiesk S. Improved intranasal immunization with live-attenuated measles virus after co-inoculation of the lipopeptide MALP-2. Vaccine 2005; 23:4721-6. [PMID: 15964669 DOI: 10.1016/j.vaccine.2005.05.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Accepted: 05/16/2005] [Indexed: 11/23/2022]
Abstract
The macrophage-activating lipopeptide with a molecular weight of 2kDa (MALP-2) activates antigen presenting cells of human, mouse and rat origin in vitro and in vivo. Here, we demonstrate that MALP-2 induces MIP1alpha and beta, MIP-2, Gro, TNFalpha, IL1alpha and IL6 in cells of cotton rats (Sigmodon hispidus) in vitro. Intranasal inoculation into cotton rats leads to migration of neutrophils and other leucocytes into the lung lumen and lung tissue. After intranasal co-inoculation of MALP-2 with live-attenuated measles vaccine virus, higher titers of neutralizing antibodies are induced but the proliferative T cell response did not increase. Immunization leads to protective immunity in the absence, but not in the presence of passively transferred measles virus (MV) specific antibodies.
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Affiliation(s)
- Anke Lührmann
- Functional and Applied Anatomy, Medical School of Hannover, Hannover, Germany
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Kaufmann A, Musset B, Limberg SH, Renigunta V, Sus R, Dalpke AH, Heeg KM, Robaye B, Hanley PJ. "Host tissue damage" signal ATP promotes non-directional migration and negatively regulates toll-like receptor signaling in human monocytes. J Biol Chem 2005; 280:32459-67. [PMID: 16030017 DOI: 10.1074/jbc.m505301200] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The activation of Toll-like receptors (TLRs) by lipopolysaccharide or other ligands evokes a proinflammatory immune response, which is not only capable of clearing invading pathogens but can also inflict damage to host tissues. It is therefore important to prevent an overshoot of the TLR-induced response where necessary, and here we show that extracellular ATP is capable of doing this in human monocytes. Using reverse transcription-PCR, we showed that monocytes express P2Y(1), P2Y(2), P2Y(4), P2Y(11), and P2Y(13) receptors, as well as several P2X receptors. To elucidate the function of these receptors, we first studied Ca(2+) signaling in single cells. ATP or UTP induced a biphasic increase in cytosolic Ca(2+), which corresponded to internal Ca(2+) release followed by activation of store-operated Ca(2+) entry. The evoked Ca(2+) signals stimulated Ca(2+)-activated K(+) channels, producing transient membrane hyperpolarization. In addition, ATP promoted cytoskeleton reorganization and cell migration; however, unlike chemoattractants, the migration was non-directional and further analysis showed that ATP did not activate Akt, essential for sensing gradients. When TLR2, TLR4, or TLR2/6 were stimulated with their respective ligands, ATPgammaS profoundly inhibited secretion of proinflammatory cytokines (tumor necrosis factor-alpha and monocyte chemoattractant protein-1) but increased the production of interleukin-10, an anti-inflammatory cytokine. In radioimmune assays, we found that ATP (or ATPgammaS) strongly increased cAMP levels, and, moreover, the TLR-response was inhibited by forskolin, whereas UTP neither increased cAMP nor inhibited the TLR-response. Thus, our data suggest that ATP promotes non-directional migration and, importantly, acts as a "host tissue damage" signal via the G(s) protein-coupled P2Y(11) receptor and increased cAMP to negatively regulate TLR signaling.
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Rharbaoui F, Westendorf A, Link C, Felk S, Buer J, Gunzer M, Guzmán CA. The Mycoplasma-derived macrophage-activating 2-kilodalton lipopeptide triggers global immune activation on nasal mucosa-associated lymphoid tissues. Infect Immun 2004; 72:6978-86. [PMID: 15557620 PMCID: PMC529172 DOI: 10.1128/iai.72.12.6978-6986.2004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
A better knowledge on how immune responses are initiated in mucosal tissues would facilitate the design of new mucosal vaccines, as well as improve our understanding on host defense against infection. We investigated the mechanisms of adjuvanticity of the Mycoplasma-derived macrophage-activating 2-kDa lipopeptide (MALP-2), which binds to the heterodimer formed by the Toll-like receptors 2 and 6 (TLR2 and -6), at the level of the murine nasal mucosa-associated lymphoid tissues (NALT). TLR2 expression analysis demonstrated that several cell types from the nasal cavity were able to overexpress this receptor, either constitutively (such as B cells) or after stimulation (i.e., T cells). MALP-2 stimulated a strong B-cell activation. In addition, the antigen presentation capacity of dendritic cells was improved after in vivo loading with antigen in the presence of MALP-2. We also observed an up-regulated expression of activation markers and adhesion molecules on T cells, suggesting that they have enhanced responsiveness and interaction potential. Quantitative reverse transcription-PCR analysis showed that MALP-2 administration resulted in the stimulation of a proinflammatory cascade. We observed an early up-regulated expression of IP-10, MCP-1, MCP-3, MIP-1alpha, MIP-2, and CCR-2 which was reversed within 36 h. The obtained results demonstrated that MALP-2 creates a reversible local microenvironment which promotes effective priming of T and B cells in the NALT.
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Affiliation(s)
- Faiza Rharbaoui
- Vaccine Research Group, Division of Microbiology, GBF German Research Center for Biotechnology, Mascheroder Weg 1, D-38124 Braunschweig, Germany
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Deiters U, Barsig J, Tawil B, Mühlradt PF. The macrophage-activating lipopeptide-2 accelerates wound healing in diabetic mice. Exp Dermatol 2004; 13:731-9. [PMID: 15560756 DOI: 10.1111/j.0906-6705.2004.00233.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Wound healing in healthy individuals proceeds at an optimal rate. However, in patients, with -- e.g.-- locally impaired blood flow or diabetes, chronic wounds develop and often become infected. Chronic wounds mean a low quality of life for the afflicted patients, not to mention enormous costs. Rather than using recombinant growth factors to accelerate wound healing, we employed the toll-like receptor agonist macrophage-activating lipopeptide-2 (MALP-2) to improve the healing of full-thickness excision skin wounds in an animal model with obese, diabetic mice. A gene array experiment suggested that MALP-2 stimulates the release of various mediators involved in wound healing. Further data to be presented in this study will show (i) that MALP-2 is capable of stimulating the appearance of the monocyte chemoattractant protein-1 at the wound site, (ii) that this leads to increased leucocyte and, in particular, macrophage infiltration and (iii) that MALP-2-treated wounds closed 2 weeks earlier than vehicle-treated controls. MALP-2, thus, appears to stimulate the early inflammatory process needed to set in motion the ensuing consecutive natural steps of wound healing resulting in wound closure.
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Affiliation(s)
- U Deiters
- Wound Healing Research Group, BioTec-Gründerzentrum, Braunschweig, Germany
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Lu X, Rosenbusch RF. Endothelial cells from bovine pulmonary microvasculature respond to Mycoplasma bovis preferentially with signals for mononuclear cell transmigration. Microb Pathog 2004; 37:253-61. [PMID: 15519046 DOI: 10.1016/j.micpath.2004.08.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2004] [Revised: 08/02/2004] [Accepted: 08/02/2004] [Indexed: 10/26/2022]
Abstract
Mycoplasma bovis can cause arthritis or mastitis following pneumonia and mycoplasmemia in cattle. Interactions with pulmonary vascular endothelium have been recorded as localized vasculitis, perivascular mononuclear cell infiltrations, and accumulation of inflammatory cells in lesions. We compared adhesion mediators and cytokine gene expression as well as cytotoxicity of cultured primary bovine aortic and bovine pulmonary microvascular endothelial cells (BPMEC) challenged with M. bovis. We also tested if abscess-forming ability of strains of M. bovis is associated with changes on endothelial cells. Increased VCAM-1 surface expression was found in both cell types, while only infected BPMEC increased MCP-1 transcription, both mediators specific for mononuclear cell transmigration. Given no induction of ICAM-1 mRNA in either cell type, induction of IL-8 mRNA by BPMEC suggested that neutrophil transmigration was signaled in microvascular areas. Infected BPMEC showed early induction of IL-1beta and IL-6 mRNA. Excepting VCAM-1, differential strain effects were limited to BPMEC and not correlated with their abscess-forming capability. In addition, only strain DSA16 had minor cytotoxic effect on both cell types. We thus show that BPMEC are more susceptible than aortic cells to M. bovis-induced activation. Activation preferentially yielded signals for mononuclear cell transmigration, correlating well with in vivo observations of infiltrating cells at pulmonary sites.
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Affiliation(s)
- Xiaodong Lu
- Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA, USA.
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Shimizu T, Kida Y, Kuwano K. Lipid-associated membrane proteins of Mycoplasma fermentans and M. penetrans activate human immunodeficiency virus long-terminal repeats through Toll-like receptors. Immunology 2004; 113:121-9. [PMID: 15312143 PMCID: PMC1782549 DOI: 10.1111/j.1365-2567.2004.01937.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Mycoplasmas are known to enhance human immunodeficiency virus (HIV) replication, and mycoplasma-derived lipid extracts have been reported to activate nuclear factor-kappaB (NF-kappaB) through Toll-like receptors (TLRs). In this study, we examined the involvement of TLRs in the activation of HIV long-terminal repeats (LTR) by mycoplasma and their active components responsible for the TLR activation. Lipid-associated membrane proteins (LAMPs) from two species of mycoplasma (Mycoplasma fermentans and M. penetrans) that are associated with acquired immune-deficiency syndrome (AIDS), were found to activate HIV LTRs in a human monocytic cell line, THP-1. NF-kappaB deletion from the LTR resulted in inhibition of the activation. The LTR activation by M. fermentans LAMPs was inhibited by a dominant negative (DN) construct of TLR1 and TLR6, whereas HIV LTR activation by M. penetrans LAMPs was inhibited by DN TLR1, but not by DN TLR6. These results indicate that the activation of HIV LTRs by M. fermentans and M. penetrans LAMPs is dependent on NF-kappaB, and that the activation of HIV LTR by M. fermentans LAMPs is mediated through TLR1, TLR2 and TLR6. In contrast, the LTR activation by M. penetrans LAMPs is carried out through TLR1 and TLR2, but not TLR6. Subsequently, the active component of M. penetrans and M. fermentans LAMPs was purified by reverse-phase high-performance liquid chromatography (HPLC). Interestingly, the purified lipoprotein of M. penetrans LAMPs (LPMp) was able to activate NF-kappaB through TLR1 and TLR2. On the other hand, the activation of NF-kappaB by purified lipoprotein of M. fermentans LAMPs (LPMf) was mediated through TLR2 and TLR6, but not TLR1.
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Affiliation(s)
- Takashi Shimizu
- Department of Bacteriology, Kurume University School of Medicine, Japan
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