1
|
Drokow EK, Effah CY, Agboyibor C, Budu JT, Arboh F, Kyei-Baffour PA, Xiao Y, Zhang F, Wu IXY. Microbial infections as potential risk factors for lung cancer: Investigating the role of human papillomavirus and chlamydia pneumoniae. AIMS Public Health 2023; 10:627-646. [PMID: 37842273 PMCID: PMC10567973 DOI: 10.3934/publichealth.2023044] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 06/22/2023] [Accepted: 07/03/2023] [Indexed: 10/17/2023] Open
Abstract
Background Lung cancer is the leading cause of cancer morbidity and mortality worldwide. Apart from tobacco smoke and dietary factors, microbial infections have been reported as the third leading cause of cancers globally. Deciphering the association between microbiome and lung cancer will provide potential biomarkers and novel insight in lung cancer progression. In this current study, we performed a meta-analysis to decipher the possible association between C. pneumoniae and human papillomavirus (HPV) and the risk of lung cancer. Methods Literature search was conducted in most English and Chinese databases. Data were analyzed using CMA v.3.0 and RevMan v.5.3 software (Cochrane-Mantel-Haenszel method) by random-effects (DerSimonian and Laird) model. Results The overall pooled estimates for HPV studies revealed that HPV infections in patients with lung cancer were significantly higher than those in the control group (OR = 2.33, 95% CI = 1.57-3.37, p < 0.001). Base on subgroup analysis, HPV infection rate was significantly higher in Asians (OR = 6.38, 95% CI = 2.33-17.46, p < 0.001), in tissues (OR = 5.04, 95% CI = 2.27-11.19, p < 0.001) and blood samples (OR = 1.40, 95% CI = 1.02-1.93, p = 0.04) of lung cancer patients but non-significantly lower in males (OR = 0.84, 95% CI = 0.57-1.22, p =0.35) and among lung cancer patients at clinical stage I-II (OR = 0.95, 95% CI = 0.61-1.49, p = 0.82). The overall pooled estimates from C. pneumoniae studies revealed that C. pneumoniae infection is a risk factor among lung cancer patients who are IgA seropositive (OR = 1.88, 95% CI = 1.30-2.70, p < 0.001) and IgG seropositive (OR = 1.50, 95% CI = 1.10-2.04, p = 0.010). All seronegative IgA (OR = 0.69, 95% CI = 0.42-1.16, p = 0.16) and IgG (OR = 0.66, 95% CI = 0.42-105, p = 0.08) titers are not associative risk factors to lung cancer. Conclusions Immunoglobulin (IgA) and IgG seropositive titers of C. pneumoniae and lungs infected with HPV types 16 and 18 are potential risk factors associated with lung cancer.
Collapse
Affiliation(s)
- Emmanuel Kwateng Drokow
- Hunan Provinical Key Laboratory of Clinical Epidemiology, Central South University, Changsha 410083, Hunan, China
- Department of Epidemiology and Biostatistics, Xiangya School of Public Health, Central South University, Changsha 410083, Hunan, China
| | - Clement Yaw Effah
- General ICU, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Critical Care Medicine, Zhengzhou Key Laboratory of Sepsis, Henan Engineering Research Center for Critical Care Medicine, Zhengzhou 450003, China
| | - Clement Agboyibor
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, China
| | | | - Francisca Arboh
- Department of Health Policy and Management, School of Management, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013 Jiangsu Province, China
| | | | - Yao Xiao
- University of Ghana Medical Center, Accra, Ghana
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Fan Zhang
- Department of Gynecology, Xiangya Hospital, Central South University, Changsha, Hunan, China, 410008
| | - Irene XY Wu
- Hunan Provinical Key Laboratory of Clinical Epidemiology, Central South University, Changsha 410083, Hunan, China
- Department of Epidemiology and Biostatistics, Xiangya School of Public Health, Central South University, Changsha 410083, Hunan, China
| |
Collapse
|
2
|
Taucher E, Mykoliuk I, Lindenmann J, Smolle-Juettner FM. Implications of the Immune Landscape in COPD and Lung Cancer: Smoking Versus Other Causes. Front Immunol 2022; 13:846605. [PMID: 35386685 PMCID: PMC8978964 DOI: 10.3389/fimmu.2022.846605] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 02/28/2022] [Indexed: 12/30/2022] Open
Abstract
Cigarette smoking is reported in about one third of adults worldwide. A strong relationship between cigarette smoke exposure and chronic obstructive pulmonary disease (COPD) as well as lung cancer has been proven. However, about 15% of lung cancer cases, and between one fourth and one third of COPD cases, occur in never-smokers. The effects of cigarette smoke on the innate as well as the adaptive immune system have been widely investigated. It is assumed that certain immunologic features contribute to lung cancer and COPD development in the absence of smoking as the major risk factor. In this article, we review different immunological aspects of lung cancer and COPD with a special focus on non-smoking related risk factors.
Collapse
Affiliation(s)
- Elisabeth Taucher
- Division of Pulmonology, Department of Internal Medicine, Medical University Graz, Graz, Austria
| | - Iurii Mykoliuk
- Division of Thoracic Surgery, Department of Surgery, Medical University Graz, Graz, Austria
| | - Joerg Lindenmann
- Division of Thoracic Surgery, Department of Surgery, Medical University Graz, Graz, Austria
| | | |
Collapse
|
3
|
Loterio RK, Zamboni DS, Newton HJ. Keeping the host alive - lessons from obligate intracellular bacterial pathogens. Pathog Dis 2021; 79:6424899. [PMID: 34755855 DOI: 10.1093/femspd/ftab052] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 11/04/2021] [Indexed: 01/20/2023] Open
Abstract
Mammals have evolved sophisticated host cell death signaling pathways as an important immune mechanism to recognize and eliminate cell intruders before they establish their replicative niche. However, intracellular bacterial pathogens that have co-evolved with their host have developed a multitude of tactics to counteract this defense strategy to facilitate their survival and replication. This requires manipulation of pro-death and pro-survival host signaling pathways during infection. Obligate intracellular bacterial pathogens are organisms that absolutely require an eukaryotic host to survive and replicate, and therefore they have developed virulence factors to prevent diverse forms of host cell death and conserve their replicative niche. This review encapsulates our current understanding of these host-pathogen interactions by exploring the most relevant findings of Anaplasma spp., Chlamydia spp., Rickettsia spp. and Coxiella burnetii modulating host cell death pathways. A detailed comprehension of the molecular mechanisms through which these obligate intracellular pathogens manipulate regulated host cell death will not only increase the current understanding of these difficult-to-study pathogens but also provide insights into new tools to study regulated cell death and the development of new therapeutic approaches to control infection.
Collapse
Affiliation(s)
- Robson Kriiger Loterio
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto Medical School, FMRP/USP. Av. Bandeirantes 3900, Ribeirão Preto, SP 14049-900, Brazil.,Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, 792 Elizabeth Street, Melbourne, 3000, Victoria, Australia
| | - Dario S Zamboni
- Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto Medical School, FMRP/USP. Av. Bandeirantes 3900, Ribeirão Preto, SP 14049-900, Brazil
| | - Hayley J Newton
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, 792 Elizabeth Street, Melbourne, 3000, Victoria, Australia
| |
Collapse
|
4
|
Links between Infections, Lung Cancer, and the Immune System. Int J Mol Sci 2021; 22:ijms22179394. [PMID: 34502312 PMCID: PMC8431665 DOI: 10.3390/ijms22179394] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 08/25/2021] [Accepted: 08/25/2021] [Indexed: 12/25/2022] Open
Abstract
Lung cancer is the leading disease of cancer-related deaths worldwide. Since the beginning of the 20th century, various infectious agents associated with lung cancer have been identified. The mechanisms that include systemic inflammatory pathways as effect of microbial persistence in the lung can secondarily promote the development of lung carcinogenesis. Chronic inflammation associated with lung-cancer infections is known to precede tumor development, and it has a strong effect on the response(s) to therapy. In fact, both viral and bacterial infections can activate inflammatory cells and inflammatory signaling pathways. In this review, an overview of critical findings of recent studies investigating associations between each of viral and bacterial pathogens and lung carcinoma is provided, with particular emphasis on how infectious organisms can interfere with oncogenic processes and all the way through immunity. Moreover, a discussion of the direct crosstalk between lung tumor development and inflammatory processes is also presented.
Collapse
|
5
|
Sixt BS. Host cell death during infection with Chlamydia: a double-edged sword. FEMS Microbiol Rev 2021; 45:5902849. [PMID: 32897321 PMCID: PMC7794043 DOI: 10.1093/femsre/fuaa043] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 09/02/2020] [Indexed: 12/12/2022] Open
Abstract
The phylum Chlamydiae constitutes a group of obligate intracellular bacteria that infect a remarkably diverse range of host species. Some representatives are significant pathogens of clinical or veterinary importance. For instance, Chlamydia trachomatis is the leading infectious cause of blindness and the most common bacterial agent of sexually transmitted diseases. Chlamydiae are exceptionally dependent on their eukaryotic host cells as a consequence of their developmental biology. At the same time, host cell death is an integral part of the chlamydial infection cycle. It is therefore not surprising that the bacteria have evolved exquisite and versatile strategies to modulate host cell survival and death programs to their advantage. The recent introduction of tools for genetic modification of Chlamydia spp., in combination with our increasing awareness of the complexity of regulated cell death in eukaryotic cells, and in particular of its connections to cell-intrinsic immunity, has revived the interest in this virulence trait. However, recent advances also challenged long-standing assumptions and highlighted major knowledge gaps. This review summarizes current knowledge in the field and discusses possible directions for future research, which could lead us to a deeper understanding of Chlamydia's virulence strategies and may even inspire novel therapeutic approaches.
Collapse
Affiliation(s)
- Barbara S Sixt
- The Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå Centre for Microbial Research (UCMR), Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden
| |
Collapse
|
6
|
Selvaraj C, Vierra M, Dinesh DC, Abhirami R, Singh SK. Structural insights of macromolecules involved in bacteria-induced apoptosis in the pathogenesis of human diseases. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2021; 126:1-38. [PMID: 34090612 DOI: 10.1016/bs.apcsb.2021.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Numbers of pathogenic bacteria can induce apoptosis in human host cells and modulate the cellular pathways responsible for inducing or inhibiting apoptosis. These pathogens are significantly recognized by host proteins and provoke the multitude of several signaling pathways and alter the cellular apoptotic stimuli. This process leads the bacterial entry into the mammalian cells and evokes a variety of responses like phagocytosis, release of mitochondrial cytochrome c, secretion of bacterial effectors, release of both apoptotic and inflammatory cytokines, and the triggering of apoptosis. Several mechanisms are involved in bacteria-induced apoptosis including, initiation of the endogenous death machinery, pore-forming proteins, and secretion of superantigens. Either small molecules or proteins may act as a binding partner responsible for forming the protein complexes and regulate enzymatic activity via protein-protein interactions. The bacteria induce apoptosis, attack the human cell and gain control over various types of cells and tissue. Since these processes are intricate in the defense mechanisms of host organisms against pathogenic bacteria and play an important function in host-pathogen interactions. In this chapter, we focus on the various bacterial-induced apoptosis mechanisms in host cells and discuss the important proteins and bacterial effectors that trigger the host cell apoptosis. The structural characterization of bacterial effector proteins and their interaction with human host cells are also considered.
Collapse
Affiliation(s)
- Chandrabose Selvaraj
- Computer Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Science Block, Alagappa University, Karaikudi, Tamil Nadu, India.
| | - Marisol Vierra
- Department of Pharmacology & Toxicology, Michigan State University, East Lansing, MI, United States
| | | | - Rajaram Abhirami
- Computer Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Science Block, Alagappa University, Karaikudi, Tamil Nadu, India
| | - Sanjeev Kumar Singh
- Computer Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Science Block, Alagappa University, Karaikudi, Tamil Nadu, India.
| |
Collapse
|
7
|
Gaissmaier L, Christopoulos P. Immune Modulation in Lung Cancer: Current Concepts and Future Strategies. Respiration 2020; 99:1-27. [PMID: 33291116 DOI: 10.1159/000510385] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 07/10/2020] [Indexed: 12/24/2022] Open
Abstract
Cancer immunotherapy represents the most dynamic field of biomedical research currently, with thoracic immuno-oncology as a forerunner. PD-(L)1 inhibitors are already part of standard first-line treatment for both non-small-cell and small-cell lung cancer, while unprecedented 5-year survival rates of 15-25% have been achieved in pretreated patients with metastatic disease. Evolving strategies are mainly aiming for improvement of T-cell function, increase of immune activation in the tumor microenvironment (TME), and supply of tumor-reactive lymphocytes. Several novel therapeutics have demonstrated preclinical efficacy and are increasingly used in rational combinations within clinical trials. Two overarching trends dominate: extension of immunotherapy to earlier disease stages, mainly as neoadjuvant treatment, and a shift of focus towards multivalent, individualized, mutatome-based antigen-specific modalities, mainly adoptive cell therapies and cancer vaccines. The former ensures ample availability of treated and untreated patient samples, the latter facilitates deeper mechanistic insights, and both in combination build an overwhelming force that is accelerating progress and driving the greatest revolution cancer medicine has seen so far. Today, immune modulation represents the most potent therapeutic modality in oncology, the most important topic in clinical and translational cancer research, and arguably our greatest, meanwhile justified hope for achieving cure of pulmonary neoplasms and other malignancies in the next future.
Collapse
Affiliation(s)
- Lena Gaissmaier
- Department of Thoracic Oncology, Thoraxklinik at Heidelberg University Hospital, Heidelberg, Germany
- Translational Lung Research Center Heidelberg (TLRC-H), German Center for Lung Research (DZL), Heidelberg, Germany
| | - Petros Christopoulos
- Department of Thoracic Oncology, Thoraxklinik at Heidelberg University Hospital, Heidelberg, Germany,
- Translational Lung Research Center Heidelberg (TLRC-H), German Center for Lung Research (DZL), Heidelberg, Germany,
| |
Collapse
|
8
|
Wang C, Zhang N, Gao L. Association between Chlamydia pneumoniae infection and lung cancer: a meta-analysis. Transl Cancer Res 2019; 8:2813-2819. [PMID: 35117038 PMCID: PMC8797589 DOI: 10.21037/tcr.2019.10.35] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 10/10/2019] [Indexed: 12/24/2022]
Abstract
Background The aim of this study is to explore the correlation between Chlamydia pneumoniae (C. pneumoniae) infection and lung carcinoma. Methods Databases of PubMed, Embase, Embase, Ovid, Wanfang and China National Knowledge Infrastructure (CNKI) database were investigated for eligible literatures from their establishments to February, 2019. Included studies were selected according to specific eligibility criteria. Statistical analysis was performed by RevMan 5.3 software. Results Thirteen studies with 2,553 lung carcinoma cases and 2,460 controls were eligible for meta-analysis. The pooled results indicated that the C. pneumoniae infection IgA significantly increased the risk of lung carcinoma (OR =3.19; 95% CI, 1.96-5.19; P<0.00001) by random effect model. And for serum IgG, the pooled OR was 2.02 (95% CI, 1.29-3.16; P<0.00001) by using the random effects model. The results indicated that the IgA positive rate was significantly higher in lung cancer patients than healthy controls. Conclusions This meta-analysis revealed that C. pneumoniae infection may be a potential risk factor for lung carcinoma. However, due to its significant heterogeneity in the included studies, the consequence should be understood with caution.
Collapse
Affiliation(s)
- Chunxi Wang
- Department of Respiration, Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases, Artificial Cell Engineering Technology Research Center, Tianjin Institute of Hepatobiliary Disease, The Third Central Hospital of Tianjin, Tianjin 300170, China
| | - Naxin Zhang
- Department of Respiration, Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases, Artificial Cell Engineering Technology Research Center, Tianjin Institute of Hepatobiliary Disease, The Third Central Hospital of Tianjin, Tianjin 300170, China
| | - Liang Gao
- Department of Respiration, Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases, Artificial Cell Engineering Technology Research Center, Tianjin Institute of Hepatobiliary Disease, The Third Central Hospital of Tianjin, Tianjin 300170, China
| |
Collapse
|
9
|
Müllebner A, Sassu EL, Ladinig A, Frömbling J, Miller I, Ehling-Schulz M, Hennig-Pauka I, Duvigneau JC. Actinobacillus pleuropneumoniae triggers IL-10 expression in tonsils to mediate colonisation and persistence of infection in pigs. Vet Immunol Immunopathol 2018; 205:17-23. [PMID: 30458998 DOI: 10.1016/j.vetimm.2018.10.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/18/2018] [Accepted: 10/19/2018] [Indexed: 12/13/2022]
Abstract
Actinobacillus pleuropneumoniae (APP) persisting in clinically healthy pigs may be the causative agent of sudden outbreaks of severe respiratory disease in swine herds. During the course of acute disease, the pathogen is eliminated from inflamed lung tissue, which is characterized by the expression of pro-inflammatory cytokines and an influx of neutrophils. However, if clearance by the porcine immune system fails, APP may switch to a persistent form. At later stages of infection, the pathogen may reside in tonsillar tissue without being eliminated by the host immune defence. To better understand the host immune response at different stages of infection, expression pattern of cytokines in tonsils and lung were recorded. In contrast to lung tissue, in which APP presence was associated with a pronounced pro-inflammatory character, APP presence in the tonsils elicited an increased IL-10 expression. In both organs of infected animals, a marked reciprocal correlation of the pro-inflammatory IL-17A and the anti-inflammatory IL-10 was found, supporting the idea that both cytokines are produced in highly associated, but reciprocal differentiated cell types, possibly APP-specific Th17 subsets. It appears that a persistent phenotype of APP triggers the anti-inflammatory immune response in tonsillar tissue in an attempt to evade the porcine immune defence.
Collapse
Affiliation(s)
- Andrea Müllebner
- Institute for Medical Biochemistry, Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Vienna, Austria; Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Vienna, Austria.
| | - Elena L Sassu
- University Clinic for Swine, Department of Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - Andrea Ladinig
- University Clinic for Swine, Department of Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - Janna Frömbling
- Functional Microbiology, Institute of Microbiology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - Ingrid Miller
- Institute for Medical Biochemistry, Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - Monika Ehling-Schulz
- Functional Microbiology, Institute of Microbiology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - Isabel Hennig-Pauka
- University Clinic for Swine, Department of Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
| | - J Catharina Duvigneau
- Institute for Medical Biochemistry, Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Vienna, Austria.
| |
Collapse
|
10
|
Nedoszytko B, Wierzbicki P, Karenko L, Maciejewska-Radomska A, Stachewicz P, Zabłotna M, Gleń J, Väkevä L, Nowicki RJ, Sokołowska-Wojdyło M. Presence of Chlamydophila pneumoniae DNA in blood cells is a frequent event in patients with the late stage of primary cutaneous lymphomas and with atopic dermatitis. Postepy Dermatol Alergol 2018; 35:274-279. [PMID: 30008645 PMCID: PMC6041706 DOI: 10.5114/ada.2018.76224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 04/14/2017] [Indexed: 01/26/2023] Open
Abstract
INTRODUCTION Microbial infection and associated super antigens have been implicated in the pathogenesis of cutaneous T-cell lymphoma (CTCL), and many patients die from complicating bacterial infections. It has been postulated that Chlamydophila pneumoniae (C. pneumoniae) infection may be involved in the pathogenesis of Mycosis fungoides (MF) but published data are limited and controversial. AIM To analyze the frequency of (C. pneumoniae) DNA presence in blood samples of lymphoma cases. MATERIAL AND METHODS Using Q-PCR method we analyzed the presence of DNA in the blood samples obtained from 57 patients with CTCL (55 - mycosis fungoides (MF)/Sézary syndrome (SS), one primary cutaneous anaplastic large cell lymphoma (CD30+) and one NKT cell lymphoma) and 3 patients with cutaneous B-cell lymphomas, and 120 individuals from control groups (40 patients with psoriasis, 40 patients with atopic dermatitis and 40 healthy controls). RESULTS Chlamydophila pneumoniae DNA was identified in 13 of 55 cases in the MF/SS group (23.6%), in 1 patient with CD30+ large cell lymphoma and in 1 of 3 patients with B-cell lymphoma. The presence of C. pneumoniae was confirmed in 1 of 40 psoriatic patients (2.5%), in 5 of 40 patients with atopic dermatitis (12.5%) and in none of 40 healthy individuals. Presence of C. pneumoniae DNA in MF patients was strongly associated with disease progression; rs = 0.756; p = 0.0123 for groups IA → IVB, and was noted more frequently in advanced (III + IV) stages than in early (I-II) stages (p = 0.0139). There are no differences in the mean age of MF/SS patients with and without infection. CONCLUSIONS The presence of C. pneumoniae DNA in the blood cells is a frequent event in late stages of MF/SS and may be explained by Th2 shift and suppression of the immune system during the course of the disease.
Collapse
Affiliation(s)
- Bogusław Nedoszytko
- Department of Dermatology, Venereology and Allergology, Medical University of Gdansk, Gdansk, Poland
| | - Piotr Wierzbicki
- Department of Histology, Medical University of Gdansk, Gdansk, Poland
| | - Leena Karenko
- Department of Dermatology and Allergology, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland
| | | | | | - Monika Zabłotna
- Department of Dermatology, Venereology and Allergology, Medical University of Gdansk, Gdansk, Poland
| | - Jolanta Gleń
- Department of Dermatology, Venereology and Allergology, Medical University of Gdansk, Gdansk, Poland
| | - Liisa Väkevä
- Department of Dermatology and Allergology, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland
| | - Roman J. Nowicki
- Department of Dermatology, Venereology and Allergology, Medical University of Gdansk, Gdansk, Poland
| | | |
Collapse
|
11
|
Aziz MA, Ushirokita R, Azuma Y. Identification of Chlamydia pneumoniae candidate genes that interact with human apoptotic factor caspase-9. J GEN APPL MICROBIOL 2018; 64:253-257. [PMID: 29760350 DOI: 10.2323/jgam.2017.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Chlamydia pneumoniae is an obligate intracellular pathogen responsible for respiratory diseases, including pneumonia and bronchitis, and is highly involved in chronic diseases, including atherosclerosis, asthma, and Alzheimer's disease. We previously showed that the host apoptotic factor caspase-9 played a crucial role for chlamydial multiplication and host apoptosis inhibition by chlamydial infection. To identify chlamydial genes interacting with human caspase-9, yeast two-hybrid screening was performed and 5 chlamydial genes, including Cpj0838 and pmpG were isolated from the C. pneumoniae genomic library. Pull-down experiments showed that caspase-9 physically bound to the Cpj0838 product and chlamydial cells, which contain PmpG proteins. This study could provide a clue to understanding host-Chlamydia interactions, especially the apoptosis repression by Chlamydia infection.
Collapse
Affiliation(s)
- Md Abdul Aziz
- Graduate School of Biology-Oriented Science and Technology, Kindai University
| | - Rie Ushirokita
- Graduate School of Biology-Oriented Science and Technology, Kindai University
| | - Yoshinao Azuma
- Graduate School of Biology-Oriented Science and Technology, Kindai University
| |
Collapse
|
12
|
Absence of Specific Chlamydia trachomatis Inclusion Membrane Proteins Triggers Premature Inclusion Membrane Lysis and Host Cell Death. Cell Rep 2018; 19:1406-1417. [PMID: 28514660 DOI: 10.1016/j.celrep.2017.04.058] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 03/15/2017] [Accepted: 04/20/2017] [Indexed: 02/07/2023] Open
Abstract
Chlamydia trachomatis is a human pathogen associated with significant morbidity worldwide. As obligate intracellular parasites, chlamydiae must survive within eukaryotic cells for sufficient time to complete their developmental cycle. To promote host cell survival, chlamydiae express poorly understood anti-apoptotic factors. Using recently developed genetic tools, we show that three inclusion membrane proteins (Incs) out of eleven examined are required for inclusion membrane stability and avoidance of host cell death pathways. In the absence of specific Incs, premature inclusion lysis results in recognition by autophagolysosomes, activation of intrinsic apoptosis, and premature termination of the chlamydial developmental cycle. Inhibition of autophagy or knockdown of STING prevented host cell death and activation of intrinsic apoptosis. Significantly, these findings emphasize the importance of Incs in the establishment of a replicative compartment that sequesters the pathogen from host surveillance systems.
Collapse
|
13
|
Short-term l-arginine supplementation attenuates elevation of interleukin 6 level after resistance exercise in overweight men. Clin Nutr ESPEN 2018; 22:43-47. [PMID: 29415833 DOI: 10.1016/j.clnesp.2017.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 06/05/2017] [Accepted: 09/05/2017] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND AIM l-Arginine (l-arg) supplementation and resistance exercise can induce changes in inflammatory and anti-inflammatory cytokines; however, it has not been investigated in obese hypertensive men. This study examines the effects of short-term l-arg supplementation and acute resistance exercise (AREX) on cytokine levels in obese hypertensive men. METHODS Eight obese hypertensive men aged 46 ± 6 yrs. with an average body weight of 92.56 ± 9.9 kg and a BMI of 31.68 ± 2.18 kg/m2 participated in a randomized, double-blinded, crossover study. The patients were distributed into exercise groups based on the type of supplementation (6 g/day of placebo or l-arg for 7 days). Supplementation periods were separated by a seven-day washout period. The AREX regimen consisted of eight exercises with an exercise intensity of 60% of 1 repetition maximum. The interleukins IL-1ra, IL-6, and IL-10 and the IL-6/IL10 ratio were determined at rest, immediately after exercise and 1 h after exercise sessions. RESULTS IL-1ra levels exhibited a significant difference both immediately and 1 h after exercise when the l-arg and placebo groups were compared (P < 0.05). IL-6 levels increased significantly after exercise in the placebo group compared with the l-arg group (P < 0.05). The placebo group showed a decrease in the IL-10 levels 1 h after exercise compared with resting levels (P < 0.05). The IL-6/IL-10 ratio showed a statistically significant increase in the placebo group after exercise compared to the l-arg group (P < 0.05). CONCLUSIONS LARG supplementation attenuates the cytokine increase after AREX, in particular peak IL-6 levels decrease and exercise induced decreases in IL-10 levels are attenuated.
Collapse
|
14
|
Du K, Zhou M, Li Q, Liu XZ. Chlamydia trachomatis inhibits the production of pro-inflammatory cytokines in human PBMCs through induction of IL-10. J Med Microbiol 2018; 67:240-248. [PMID: 29388547 DOI: 10.1099/jmm.0.000672] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
PURPOSE Previous research demonstrated that IL-10 was up-regulated in Chlamydia trachomatis-infected cells and that exogenous IL-10 was able to inhibit the secretion of pro-inflammatory cytokines by infected cells. However, the mechanisms are not well understood. The aim of this study was to investigate the mechanisms for up-regulation of IL-10 and inhibition of pro-inflammatory cytokine secretion in C. trachomatis-stimulated peripheral blood mononuclear cells (PBMCs). METHODOLOGY Human PBMCs were isolated from the blood of healthy human donors by standard Ficoll-Hypaque density gradient centrifugation. Cells were exposed to C. trachomatis in the presence or absence of MEK inhibitor U0126, the p38 inhibitor SB203580, the STAT3 inhibitor Ruxolitinib or anti-human IL-10 antibody. Cytokines were measured from culture supernatants using ELISA kits. Cells were harvested for real-time quantitative PCR to determine IL-10 mRNA levels and for Western blot assay to detect the expression of ERK1/2, p-ERK1/2, p38, p-p38, STAT3 and p-STAT3. RESULTS Both mRNA and protein levels of IL-10 were up-regulated in stimulated cells, and the production of IL-10 was reduced when cells were treated with U0126 or SB203580. The expression of cytokines IL-6, IL-8 and TNF-α was enhanced in stimulated cells treated with anti-human IL-10 antibody. Moreover, neutralization of IL-10 resulted in a significant decrease of phosphorylated STAT3 in stimulated cells. Ruxolitinib caused a significant increase in the production of IL-6, IL-8 and TNF-α in stimulated cells. CONCLUSION IL-10 is up-regulated in an ERK- and p38-dependent fashion in stimulated human PBMCs. IL-10 inhibits the production of pro-inflammatory cytokines by activating the JAK/STAT signalling pathway.
Collapse
Affiliation(s)
- Kun Du
- Department of clinical laboratory, The first clinical medical college of Yangtze university and the first people's hospital of Jingzhou, Jingzhou 434000, Hubei Province, PR China
| | - Ming Zhou
- Department of clinical laboratory, The first clinical medical college of Yangtze university and the first people's hospital of Jingzhou, Jingzhou 434000, Hubei Province, PR China
| | - Qi Li
- Department of clinical laboratory, The first clinical medical college of Yangtze university and the first people's hospital of Jingzhou, Jingzhou 434000, Hubei Province, PR China
| | - Xue-Zheng Liu
- Department of clinical laboratory, The first clinical medical college of Yangtze university and the first people's hospital of Jingzhou, Jingzhou 434000, Hubei Province, PR China
| |
Collapse
|
15
|
Exploiting induced pluripotent stem cell-derived macrophages to unravel host factors influencing Chlamydia trachomatis pathogenesis. Nat Commun 2017; 8:15013. [PMID: 28440293 PMCID: PMC5414054 DOI: 10.1038/ncomms15013] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 02/21/2017] [Indexed: 02/07/2023] Open
Abstract
Chlamydia trachomatis remains a leading cause of bacterial sexually transmitted infections and preventable blindness worldwide. There are, however, limited in vitro models to study the role of host genetics in the response of macrophages to this obligate human pathogen. Here, we describe an approach using macrophages derived from human induced pluripotent stem cells (iPSdMs) to study macrophage–Chlamydia interactions in vitro. We show that iPSdMs support the full infectious life cycle of C. trachomatis in a manner that mimics the infection of human blood-derived macrophages. Transcriptomic and proteomic profiling of the macrophage response to chlamydial infection highlighted the role of the type I interferon and interleukin 10-mediated responses. Using CRISPR/Cas9 technology, we generated biallelic knockout mutations in host genes encoding IRF5 and IL-10RA in iPSCs, and confirmed their roles in limiting chlamydial infection in macrophages. This model can potentially be extended to other pathogens and tissue systems to advance our understanding of host-pathogen interactions and the role of human genetics in influencing the outcome of infections. In vitro models to study the role of host genetics in the response to chlamydial infection are limited. Here, Yeung et al. show that macrophages derived from human induced pluripotent stem cells (which can be genetically manipulated) support chlamydial infection and can be used for this purpose.
Collapse
|
16
|
Abstract
Chlamydia is an obligate intracellular bacterial pathogen that replicates solely within a membrane-bound vacuole termed an inclusion. Chlamydia seems to perturb multiple cellular processes of the host, such as, rearrangement of the membrane trafficking system for its intracellular multiplication, and inhibition of host cell apoptosis for persistent infection. In an attempt to clarify host factor involvement in apoptosis regulation, we found that inhibition of Caspase-9 restricted, while Apaf-1 promoted, Chlamydia pneumoniae infection in HEp-2, HeLa, and mouse epithelial fibroblast (MEF) cells. These opposition contributions to the chlamydial infection were confirmed using caspase-9−/− and apaf-1−/− MEFs. Similar phenomena also appeared in the case of infection with Chlamydia trachomatis. Interestingly, caspase-9 in apaf-1−/− MEFs was activated by chlamydial infection but during the infection caspase-3 was not activated. That is, caspase-9 was activated without support for multiplication and activation by Apaf-1, and the activated caspase-9 may be physically disconnected from the caspase cascade. This may be partially explained by the observation of caspase-9 accumulation within chlamydial inclusions. The sequestration of caspase-9 by chlamydia seems to result in apoptosis repression, which is crucial for the chlamydial development cycle. Because Apaf-1 shares domains with intracellular innate immune receptor NOD1, it may play a key role in the strategy to regulate chlamydial infection.
Collapse
|
17
|
Abstract
Chlamydia species are obligate intracellular parasites which cause usually asymptomatic genital tract infections and also are associated with several complications. Previous studies demonstrated that immune responses to Chlamydia species are different and the diseases will be limited to some cases. Additionally, Chlamydia species are able to modulate immune responses via regulating expression of some immune system molecules including cytokines. IL-10, as the main anti-inflammatory cytokine, plays important roles in the induction of immune-tolerance against self-antigen and also immune-homeostasis after microbe elimination. Furthermore, it has been documented that ectopic expression of IL-10 is associated with several chronic infectious diseases. Therefore, it can be hypothesized that changes in the regulation of this cytokine can be associated with infection with several species of Chlamydia and their associated complications. This review collected the recent information regarding the association and relationship of IL-10 with Chlamydia infections. Another aim of this review article is to address recent data regarding the association of genetic variations (polymorphisms) of IL-10 and Chlamydia infections.
Collapse
|
18
|
Das S, Ghosh AK, Singh S, Saha B, Ganguly A, Das P. Unmethylated CpG motifs in the L. donovani DNA regulate TLR9-dependent delay of programmed cell death in macrophages. J Leukoc Biol 2014; 97:363-78. [PMID: 25473100 DOI: 10.1189/jlb.4a0713-378rr] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Regulation of macrophage PCD plays an important role in pathogenesis of leishmaniasis. However, the precise involvement of any parasite molecule in this process remains uncertain. In the current study, in silico wide analysis demonstrated that genes in the Leishmania donovani genome are highly enriched for CpG motifs, with sequence frequency of 8.7%. Here, we show that unmethylated species-specific CpG motifs in LdDNA significantly (P = 0.01) delay macrophage PCD by endosomal interaction with TLR9 via the adaptor protein MyD88. Importantly, LdDNA triggered high levels of luciferase activity (P = 0.001) under NF-κB-dependent transcription in HEK-TLR9 cells. Furthermore, the activation of caspases in macrophages was inhibited (P = 0.001) in the presence of LdDNA. Notably, the delay of PCD was mediated by modulation of the antiapoptotic proteins, Mcl-1 and Bfl-1, and impairment of loss of Δψm in macrophages through the neutralization of oxidative and nitrosative stress. The inhibition of caspase activation and up-regulation of Mcl-1 by LdDNA were TLR9 dependent. Analysis of the targets of LdDNA identified an early activation of the TLR9-dependent PI3K/Akt and SFK pathways, which were required for the observation of the antiapoptotic effects in macrophages. Moreover, we demonstrate that LdDNA modulates the TLR9-IκB-α pathway by promoting the tyrosine phosphorylation of TLR9 and the TLR9-mediated recruitment of Syk kinase. The results have identified a novel, TLR9-dependent antiapoptotic function of LdDNA, which will provide new opportunities for discovering and evaluating molecular targets for drug and vaccine designing against VL.
Collapse
Affiliation(s)
- Sushmita Das
- *Department of Microbiology, All-India Institute of Medical Sciences, Patna, India; Rajendra Memorial Research Institute of Medical Sciences, Patna, India; Institute of Microbial Technology, Chandigarh, India; and National Centre for Cell Science, Pune, India
| | - Ayan Kumar Ghosh
- *Department of Microbiology, All-India Institute of Medical Sciences, Patna, India; Rajendra Memorial Research Institute of Medical Sciences, Patna, India; Institute of Microbial Technology, Chandigarh, India; and National Centre for Cell Science, Pune, India
| | - Shikha Singh
- *Department of Microbiology, All-India Institute of Medical Sciences, Patna, India; Rajendra Memorial Research Institute of Medical Sciences, Patna, India; Institute of Microbial Technology, Chandigarh, India; and National Centre for Cell Science, Pune, India
| | - Bhaskar Saha
- *Department of Microbiology, All-India Institute of Medical Sciences, Patna, India; Rajendra Memorial Research Institute of Medical Sciences, Patna, India; Institute of Microbial Technology, Chandigarh, India; and National Centre for Cell Science, Pune, India
| | - Ashish Ganguly
- *Department of Microbiology, All-India Institute of Medical Sciences, Patna, India; Rajendra Memorial Research Institute of Medical Sciences, Patna, India; Institute of Microbial Technology, Chandigarh, India; and National Centre for Cell Science, Pune, India
| | - Pradeep Das
- *Department of Microbiology, All-India Institute of Medical Sciences, Patna, India; Rajendra Memorial Research Institute of Medical Sciences, Patna, India; Institute of Microbial Technology, Chandigarh, India; and National Centre for Cell Science, Pune, India
| |
Collapse
|
19
|
Kun D, Xiang-Lin C, Ming Z, Qi L. Chlamydia inhibit host cell apoptosis by inducing Bag-1 via the MAPK/ERK survival pathway. Apoptosis 2014; 18:1083-92. [PMID: 23708800 DOI: 10.1007/s10495-013-0865-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Chlamydia are obligate intracellular bacteria that frequently cause human disease. Host cells infected with Chlamydia are profoundly resistant to diverse apoptotic stimuli. The inhibition of apoptosis is thought to be an important immune escape mechanism allowing Chlamydia to productively complete their obligate intracellular growth cycle. Chlamydial antiapoptotic activity involves activation of the MAPK/ERK survival pathway. However, the molecular mechanisms are not well understood. Here we show that Bag-1 is up-regulated in Chlamydia-infected cells. U0126 and GW5074 suppress the induction of Bag-1 by Chlamydia, implying that Chlamydia may up-regulate Bag-1 via the MAPK/ERK survival pathway. Overexpression of Bag-1 is sufficient to protect against apoptosis, while depletion of Bag-1 suppresses the antiapoptotic effect of Chlamydia. The data indicate Chlamydia may up-regulate Bag-1 through the MAPK/ERK survival pathway to suppress apoptosis.
Collapse
Affiliation(s)
- Du Kun
- Department of Clinical Laboratory, The First Affiliated Hospital of Yangtze University, 434000, Jingzhou, Hubei, China.
| | | | | | | |
Collapse
|
20
|
Bastidas RJ, Elwell CA, Engel JN, Valdivia RH. Chlamydial intracellular survival strategies. Cold Spring Harb Perspect Med 2013; 3:a010256. [PMID: 23637308 DOI: 10.1101/cshperspect.a010256] [Citation(s) in RCA: 156] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Chlamydia trachomatis is the most common sexually transmitted bacterial pathogen and the causative agent of blinding trachoma. Although Chlamydia is protected from humoral immune responses by residing within remodeled intracellular vacuoles, it still must contend with multilayered intracellular innate immune defenses deployed by its host while scavenging for nutrients. Here we provide an overview of Chlamydia biology and highlight recent findings detailing how this vacuole-bound pathogen manipulates host-cellular functions to invade host cells and maintain a replicative niche.
Collapse
Affiliation(s)
- Robert J Bastidas
- Department of Molecular Genetics and Microbiology, Center for Microbial Pathogenesis, Duke University Medical Center, Durham, NC 27710, USA
| | | | | | | |
Collapse
|
21
|
Shimada K, Crother TR, Arditi M. Innate immune responses to Chlamydia pneumoniae infection: role of TLRs, NLRs, and the inflammasome. Microbes Infect 2012; 14:1301-7. [PMID: 22985781 DOI: 10.1016/j.micinf.2012.08.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 08/08/2012] [Accepted: 08/09/2012] [Indexed: 12/22/2022]
Abstract
Chlamydiae are important human pathogens that are responsible for a wide rage of diseases with a significant impact on public health. In this review article we highlight how recent studies have increased our knowledge of Chlamydia pneumoniae pathogenesis and mechanisms of innate immunity directed host defense against C. pneumoniae infection.
Collapse
Affiliation(s)
- Kenichi Shimada
- Division of Pediatric Infectious Diseases and Immunology, Cedars-Sinai Medical Center and David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA 90048, USA
| | | | | |
Collapse
|
22
|
Hirai I, Ebara M, Nakanishi S, Yamamoto C, Sasaki T, Ikuta K, Yamamoto Y. Jurkat cell proliferation is suppressed by Chlamydia (Chlamydophila) pneumoniae infection accompanied with attenuation of phosphorylation at Thr389 of host cellular p70S6K. Immunobiology 2012; 218:527-32. [PMID: 22795649 DOI: 10.1016/j.imbio.2012.06.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 06/20/2012] [Accepted: 06/20/2012] [Indexed: 01/02/2023]
Abstract
Chlamydia (Chlamydophila) pneumoniae infects T lymphocytes and multiplies within them. Our previous studies have indicated that C. pneumoniae infection suppresses proliferation of peripheral blood mononuclear cells stimulated with Staphylococcus-enterotoxin B; however, the mechanism of suppression was unclear. In this study, we explored the molecular mechanism involved in C. pneumoniae infection by using human acute T cell leukemia cell line, Jurkat E6-1. Proliferation of Jurkat cells was suppressed in an m.o.i.-dependent manner by C. pneumoniae infection. The suppression by the infection was particularly evident during the initial 24h of the infection, and down modulation of cyclin D3 protein levels were observed at the same time period by immunoblot analysis. The suppression of the Jurkat cell proliferation and the down modulation of cyclin D3 protein level were only induced by viable C. pneumoniae infection, not by exposure to UV-killed or heat-killed C. pneumoniae. Phosphorylations at Thr308 and Ser473 of AKT were induced by C. pneumoniae infection; however, phosphorylation at Thr389 of the downstream kinase, p70S6K was inhibited by unidentified mechanism associated with C. pneumoniae infection. Taking into account that G1 arrest of the C. pneumoniae infected Jurkat cells were not observed and that p70S6K is one of the most important regulators of protein synthesis, it was suggested that the suppression of Jurkat cell proliferation by C. pneumoniae was at least in part mediated by down modulation of protein synthesis through attenuation of Thr389 phosphorylation of p70S6K.
Collapse
Affiliation(s)
- Itaru Hirai
- Department of Biomedical Informatics, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
| | | | | | | | | | | | | |
Collapse
|
23
|
Interleukin-10 and immunity against prokaryotic and eukaryotic intracellular pathogens. Infect Immun 2011; 79:2964-73. [PMID: 21576331 DOI: 10.1128/iai.00047-11] [Citation(s) in RCA: 146] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The generation of an effective immune response against an infection while also limiting tissue damage requires a delicate balance between pro- and anti-inflammatory responses. Interleukin-10 (IL-10) has potent immunosuppressive effects and is essential for regulation of immune responses. However, the immunosuppressive properties of IL-10 can also be exploited by pathogens to facilitate their own survival. In this minireview, we discuss the role of IL-10 in modulating intracellular bacterial, fungal, and parasitic infections. Using information from several different infection models, we bring together and highlight some common pathways for IL-10 regulation and function that cannot be fully appreciated by studies of a single pathogen.
Collapse
|
24
|
Abstract
The link between chronic immune activation and tumorigenesis is well established. Compelling evidence has accumulated that histologic assessment of infiltration patterns of different host immune response components in non-small cell lung cancer specimens helps identify different prognostic patient subgroups. This review provides an overview of recent insights gained in the understanding of the role played by chronic inflammation in lung carcinogenesis. The usefulness of quantification of different populations of lymphocytes, natural killer cells, macrophages, and mast cells within the tumor microenvironment in non-small cell lung cancer is also discussed. In particular, the importance of assessment of inflammatory cell microlocalization within both the tumor islet and surrounding stromal components is emphasized.
Collapse
|
25
|
Abstract
Pathogenicity of Chlamydia and Chlamydia-related bacteria could be partially mediated by an enhanced activation of the innate immune response. The study of this host pathogen interaction has proved challenging due to the restricted in vitro growth of these strict intracellular bacteria and the lack of genetic tools to manipulate their genomes. Despite these difficulties, the interactions of Chlamydiales with the innate immune cells and their effectors have been studied thoroughly. This review aims to point out the role of pattern recognition receptors and signal molecules (cytokines, reactive oxygen species) of the innate immune response in the pathogenesis of chlamydial infection. Besides inducing clearance of the bacteria, some of these effectors may be used by the Chlamydia to establish chronic infections or to spread. Thus, the induced innate immune response seems to be variable depending on the species and/or the serovar, making the pattern more complex. It remains crucial to determine the common players of the innate immune response in order to help define new treatment strategies and to develop effective vaccines. The excellent growth in phagocytic cells of some Chlamydia-related organisms such as Waddlia chondrophila supports their use as model organisms to study conserved features important for interactions between the innate immunity and Chlamydia.
Collapse
Affiliation(s)
- Brigida Rusconi
- Institute of Microbiology, University of Lausanne and University Hospital Center, Lausanne, Switzerland
| | | |
Collapse
|
26
|
Sessa R, Di Pietro M, Schiavoni G, Macone A, Maras B, Fontana M, Zagaglia C, Nicoletti M, Del Piano M, Morrone S. Chlamydia pneumoniae induces T cell apoptosis through glutathione redox imbalance and secretion of TNF-alpha. Int J Immunopathol Pharmacol 2009; 22:659-68. [PMID: 19822082 DOI: 10.1177/039463200902200311] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Chlamydia pneumoniae persistent infection has been implicated in the pathogenesis of several chronic inflammatory diseases including atherosclerosis, and we hypothesized that modulation of the apoptosis of macrophages and/or T cells by C. pneumoniae infection may contribute to the development of such diseases. We therefore evaluated apoptosis, cytokine response, and redox status in human primary T cells and macrophages infected with C. pneumoniae. In addition, co-cultures of T cells and macrophages infected with C. pneumoniae were also carried out. Apoptosis, and levels of glutathione (GSH), glutathione disulfide (GSSG), and tumour necrosis factor (TNF)-alpha were measured by flow cytometry, high performance liquid chromatography and enzyme-linked immunosorbent assay. C. pneumoniae induced apoptosis in T cells as well as in co-cultures of T cells and infected macrophages by marked decrease in GSH/GSSG ratio and increased production of TNF-alpha, respectively. The results demonstrate that interaction of C. pneumoniae with T cells and/or macrophages characterized by interference with redox status, and secretion of tumour necrosis factor-alpha culminates in the induction of T cell apoptosis and survival of infected macrophages. In conclusion, the inappropriate T cell response against C. pneumoniae and survival of infected macrophages could explain the persistence of this intracellular obligate pathogen in the host-organism; it may contribute to the development of chronic inflammatory diseases, although further studies are needed to clarify such a complex mechanism.
Collapse
Affiliation(s)
- R Sessa
- Department of Public Health Sciences, Sapienza University, Rome, Italy
| | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Zhong G. Killing me softly: chlamydial use of proteolysis for evading host defenses. Trends Microbiol 2009; 17:467-74. [PMID: 19765998 DOI: 10.1016/j.tim.2009.07.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 04/06/2009] [Accepted: 07/13/2009] [Indexed: 12/13/2022]
Abstract
Chlamydial infections in humans cause severe health problems, including blinding trachoma and sexually transmitted diseases. Although the involved pathogenic mechanisms remain unclear, the ability to replicate and maintain long-term residence in the infected cells seems to significantly contribute to chlamydial pathogenicity. These obligate intracellular parasites maintain a delicate balance between exploiting and protecting their host: they occupy intracellular space and acquire nutrients from the infected cells, but at the same time they have to maintain the integrity of the host cells for the completion of their intracellular growth. For this purpose, chlamydiae hijack certain signaling pathways that prevent the host cells from undergoing apoptosis induced by intracellular stress and protect the infected cells from recognition and attack by host defenses. Interestingly, one of the strategies that chlamydiae use for these purposes is the induction of limited proteolysis of host proteins, which is the main focus of this article.
Collapse
Affiliation(s)
- Guangming Zhong
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA.
| |
Collapse
|
28
|
Verma V, Shen D, Sieving PC, Chan CC. The role of infectious agents in the etiology of ocular adnexal neoplasia. Surv Ophthalmol 2008; 53:312-31. [PMID: 18572051 DOI: 10.1016/j.survophthal.2008.04.008] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Given the fact that infectious agents contribute to around 18% of human cancers worldwide, it would seem prudent to explore their role in neoplasms of the ocular adnexa: primary malignancies of the conjunctiva, lacrimal glands, eyelids, and orbit. By elucidating the mechanisms by which infectious agents contribute to oncogenesis, the management, treatment, and prevention of these neoplasms may one day parallel what is already in place for cancers such as cervical cancer, hepatocellular carcinoma, gastric mucosa-associated lymphoid tissue lymphoma and gastric adenocarcinoma. Antibiotic treatment and vaccines against infectious agents may herald a future with a curtailed role for traditional therapies of surgery, radiation, and chemotherapy. Unlike other malignancies for which large epidemiological studies are available, analyzing ocular adnexal neoplasms is challenging as they are relatively rare. Additionally, putative infectious agents seemingly display an immense geographic variation that has led to much debate regarding the relative importance of one organism versus another. This review discusses the pathogenetic role of several microorganisms in different ocular adnexal malignancies, including human papilloma virus in conjunctival papilloma and squamous cell carcinoma, human immunodeficiency virus in conjunctival squamous carcinoma, Kaposi sarcoma-associated herpes virus or human herpes simplex virus-8 (KSHV/HHV-8) in conjunctival Kaposi sarcoma, Helicobacter pylori (H. pylori,), Chlamydia, and hepatitis C virus in ocular adnexal mucosa-associated lymphoid tissue lymphomas. Unlike cervical cancer where a single infectious agent, human papilloma virus, is found in greater than 99% of lesions, multiple organisms may play a role in the etiology of certain ocular adnexal neoplasms by acting through similar mechanisms of oncogenesis, including chronic antigenic stimulation and the action of infectious oncogenes. However, similar to other human malignancies, ultimately the role of infectious agents in ocular adnexal neoplasms is most likely as a cofactor to genetic and environmental risk factors.
Collapse
MESH Headings
- Alphapapillomavirus/isolation & purification
- Alphapapillomavirus/physiology
- Carcinoma, Squamous Cell/virology
- Chlamydophila psittaci/isolation & purification
- Chlamydophila psittaci/physiology
- Conjunctival Neoplasms/microbiology
- Conjunctival Neoplasms/virology
- Eye Infections, Bacterial/microbiology
- Eye Infections, Bacterial/pathology
- Eye Infections, Viral/pathology
- Eye Infections, Viral/virology
- Eye Neoplasms/microbiology
- Eye Neoplasms/virology
- Eyelid Neoplasms/microbiology
- Eyelid Neoplasms/virology
- HIV-1/isolation & purification
- HIV-1/physiology
- Helicobacter pylori/isolation & purification
- Helicobacter pylori/physiology
- Hepacivirus/isolation & purification
- Hepacivirus/physiology
- Herpesvirus 8, Human/isolation & purification
- Herpesvirus 8, Human/physiology
- Humans
- Lacrimal Apparatus Diseases/microbiology
- Lacrimal Apparatus Diseases/virology
- Lymphoma, B-Cell, Marginal Zone/virology
- Orbital Neoplasms/microbiology
- Orbital Neoplasms/virology
- Sarcoma, Kaposi/virology
Collapse
Affiliation(s)
- Varun Verma
- Immunopathology Section, Laboratory of Immunology, National Eye Institute, Bethesda, Maryland 20892-1857, USA
| | | | | | | |
Collapse
|
29
|
Inhibition of lymphocyte CD3 expression by Chlamydophila pneumoniae infection. Microb Pathog 2008; 45:290-6. [PMID: 18674609 DOI: 10.1016/j.micpath.2008.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2008] [Revised: 06/16/2008] [Accepted: 06/26/2008] [Indexed: 11/22/2022]
Abstract
Since lymphocytes are a major immune cell besides macrophages in the development of atherosclerosis, interaction between lymphocytes and Chlamydophila pneumoniae may contribute to the pathogenesis of chronic inflammatory diseases associated with C. pneumoniae. In this regard, we examined a possible alteration of CD3 expression of human lymphocyte Molt-4 cells by C. pneumoniae infection. The expression levels of CD3 molecules of lymphocyte Molt-4 cells were significantly decreased by C. pneumoniae infection. In contrast, heat-killed C. pneumoniae as well as mock (cell lysates) did not cause any alteration of CD3 expression of the cells. Treatment of the infected cells with NS-398 (cyclo-oxyganase-2 inhibitor) or AH-23848 (EP(4) prostanoid receptor antagonist) abolished the inhibition of CD3 expression. The enhanced prostaglandin E(2) (PGE(2)) productions in the culture supernatants of infected cells were confirmed by competitive enzyme-immunosorbent assay (ELISA). C. pneumoniae infection of enriched lymphocytes from human peripheral blood mononuclear cells also induced a decrease of CD3 expression. Thus, C. pneumoniae infection of lymphocytes induces a decrease of CD3 expression mediated by possibly PGE(2) production.
Collapse
|
30
|
Sun J, Kintner J, Schoborg RV. The host adherens junction molecule nectin-1 is downregulated in Chlamydia trachomatis-infected genital epithelial cells. MICROBIOLOGY-SGM 2008; 154:1290-1299. [PMID: 18451037 DOI: 10.1099/mic.0.2007/015164-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Nectin-1, a member of the immunoglobulin superfamily, is a Ca(2+)-independent cell adhesion protein implicated in the organization of E-cadherin-based adherens junctions (AJs) and claudin-based tight junctions (TJs) in epithelial cells. Nectin-1 also regulates cell-cell adhesion and cell polarization in a Cdc42- and Rac-dependent manner. Western blot analyses demonstrated that accumulation of host nectin-1 is decreased by 85 % at 48 hours post-infection (h.p.i.) in Chlamydia trachomatis serovar E-infected HeLa cells. Time-course experiments demonstrated that this decrease was sustained to 60 h.p.i. Nectin-1 downregulation in C. trachomatis-infected cells was prevented by both chloramphenicol exposure and prior inactivation of the chlamydiae with UV light, demonstrating that active C. trachomatis replication was required. Penicillin G-exposure studies demonstrated that nectin-1 accumulation was also altered during persistent infection. Finally, RT-PCR analyses indicated that chlamydial infection did not alter accumulation of any nectin-1 transcripts, demonstrating that nectin-1 accumulation is reduced at a post-transcriptional level. Intesrestingly, N-cadherin-dependent cell-cell junctions can be disrupted by C. trachomatis infection, as reported by Prozialeck et al. (2002). Because interaction of nectin molecules on adjacent cells is essential for AJ formation, these data suggest that C. trachomatis may disrupt AJs, at least in part, by diminishing nectin-1 accumulation. Notably, release of chlamydiae-infected epithelial cells has been observed both in vitro from polarized monolayers and in vivo from tissues, suggesting that chlamydia-modulated downregulation of adhesion molecules and the subsequent disruption of host cell adherence may be involved in chlamydial dissemination or pathogenesis.
Collapse
Affiliation(s)
- Jingru Sun
- Department of Microbiology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, USA
| | - Jennifer Kintner
- Department of Microbiology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, USA
| | - Robert V Schoborg
- Department of Microbiology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, USA
| |
Collapse
|
31
|
Jung SH, Park HS, Kim KS, Choi WH, Ahn CW, Kim BT, Kim SM, Lee SY, Ahn SM, Kim YK, Kim HJ, Kim DJ, Lee KW. Effect of weight loss on some serum cytokines in human obesity: increase in IL-10 after weight loss. J Nutr Biochem 2008; 19:371-5. [PMID: 17614271 DOI: 10.1016/j.jnutbio.2007.05.007] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2006] [Revised: 04/18/2007] [Accepted: 05/15/2007] [Indexed: 12/15/2022]
Abstract
Obesity is a major risk factor for hypertension, coronary artery disease and type 2 diabetes. Weight loss is associated with significant metabolic benefits. Our objective was to examine changes in adipocytokines and interleukin (IL) 10 in obese subjects before and after weight loss. We measured anthropometric parameters, adipocytokine and IL-10 in 78 obese people who had visited obesity clinics at five university hospitals (Ajou, Ulsan, Catholic, Hanyang and Yonsei) in Korea. They restricted their caloric intake to less than their usual intake (by 500 kcal), were administered sibutramine and were given a program of exercise for 12 weeks. After 12 weeks, weight, body mass index, waist circumference, hip circumference, waist-to-hip ratio, total body fat, total cholesterol, triglyceride, tumor necrosis factor alpha (TNF-alpha), IL-6, resistin and leptin had significantly decreased, while adiponectin and IL-10 had significantly increased. A bivariate correlation analysis found that increment in IL-10 and baseline IL-10 levels significantly correlated with decrement in TNF-alpha (P<.01) and baseline adiponectin (r=.52, P<.001), respectively. These results were confirmed in a multiple regression analysis. The results suggest that weight loss after caloric restriction and medical treatment in obesity can improve metabolic risk factors through changes in some cytokines.
Collapse
Affiliation(s)
- Sun Hye Jung
- Department of Endocrinology and Metabolism, Ajou University School of Medicine, Yongtong Gu, Suwon 443-721, South Korea
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Shi Y, Liu Y, Murdin A, Raudonikiene‐Mancevski A, Ayach B, Yu Z, Fantus I, Liu P. Chlamydophila pneumoniaeInhibits Differentiation of Progenitor Adipose Cells and Impairs Insulin Signaling. J Infect Dis 2008; 197:439-48. [DOI: 10.1086/525045] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
|
33
|
Appelt DM, Roupas MR, Way DS, Bell MG, Albert EV, Hammond CJ, Balin BJ. Inhibition of apoptosis in neuronal cells infected with Chlamydophila (Chlamydia) pneumoniae. BMC Neurosci 2008; 9:13. [PMID: 18218130 PMCID: PMC2266938 DOI: 10.1186/1471-2202-9-13] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2007] [Accepted: 01/24/2008] [Indexed: 12/29/2022] Open
Abstract
Background Chlamydophila (Chlamydia) pneumoniae is an intracellular bacterium that has been identified within cells in areas of neuropathology found in Alzheimer disease (AD), including endothelia, glia, and neurons. Depending on the cell type of the host, infection by C. pneumoniae has been shown to influence apoptotic pathways in both pro- and anti-apoptotic fashions. We have hypothesized that persistent chlamydial infection of neurons may be an important mediator of the characteristic neuropathology observed in AD brains. Chronic and/or persistent infection of neuronal cells with C. pneumoniae in the AD brain may affect apoptosis in cells containing chlamydial inclusions. Results SK-N-MC neuroblastoma cells were infected with the respiratory strain of C. pneumoniae, AR39 at an MOI of 1. Following infection, the cells were either untreated or treated with staurosporine and then examined for apoptosis by labeling for nuclear fragmentation, caspase activity, and membrane inversion as indicated by annexin V staining. C. pneumoniae infection was maintained through 10 days post-infection. At 3 and 10 days post-infection, the infected cell cultures appeared to inhibit or were resistant to the apoptotic process when induced by staurosporine. This inhibition was demonstrated quantitatively by nuclear profile counts and caspase 3/7 activity measurements. Conclusion These data suggest that C. pneumoniae can sustain a chronic infection in neuronal cells by interfering with apoptosis, which may contribute to chronic inflammation in the AD brain.
Collapse
Affiliation(s)
- Denah M Appelt
- Department of Neuroscience, Physiology & Pharmacology, Philadelphia College of Osteopathic Medicine, Philadelphia, USA.
| | | | | | | | | | | | | |
Collapse
|
34
|
Kohlhoff SA, Kutlin A, Riska P, Roblin PM, Roman C, Hammerschlag MR. In vitro models of acute and long-term continuous infection of human respiratory epithelial cells with Chlamydophila pneumoniae have opposing effects on host cell apoptosis. Microb Pathog 2007; 44:34-42. [PMID: 17888618 DOI: 10.1016/j.micpath.2007.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Accepted: 08/01/2007] [Indexed: 02/01/2023]
Abstract
Persistent infection with the obligate intracellular pathogen Chlamydophila pneumoniae has been implicated in the pathogenesis of many chronic diseases, but its mechanism remains unclear. Many pathogens have been found to modulate cellular apoptosis in order to survive and multiply. Chlamydial species were shown to both induce and inhibit host cell apoptosis depending on the experimental conditions. We utilized in vitro models of acute and long-term continuous (LTC) infection with the same cell line (HEp-2) and chlamydial isolate (TW-183) used in both models. Host cell apoptosis in infected and uninfected cells was assessed by fluorescence microscopy and flow cytometry. While acute infection induced apoptosis 72 h post-infection, LTC-infected cells had low rates of apoptosis and showed resistance to different exogenous inducers of apoptosis (sorbitol, serum withdrawal, hydrogen peroxide) when compared to uninfected cells. Chronicity of infection appears to be a critical factor in the modulation of host cell apoptosis by C. pneumoniae. Induction of apoptosis may help to propagate the infection, while inhibition of apoptosis could help protect the organism in chronic infection.
Collapse
Affiliation(s)
- Stephan A Kohlhoff
- Department of Pediatrics, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA.
| | | | | | | | | | | |
Collapse
|
35
|
Mamata Y, Hakki A, Newton C, Burdash N, Klein TW, Friedman H. Differential effects of Chlamydia pneumoniae infection on cytokine levels in human T lymphocyte- and monocyte-derived cell cultures. Int J Med Microbiol 2007; 297:109-15. [PMID: 17280867 DOI: 10.1016/j.ijmm.2006.11.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2006] [Revised: 10/23/2006] [Accepted: 11/21/2006] [Indexed: 11/23/2022] Open
Abstract
Continuous cultures of human lymphocyte- and monocyte-derived cell lines were examined for levels of immunoregulatory cytokines important in resistance to the intracellular opportunistic bacterium Chlamydia pneumoniae (Cp), a ubiquitous pathogen widely disseminated in the population and hypothesized to be involved in chronic inflammatory diseases such as atherosclerosis and neurological diseases like multiple sclerosis and Alzheimer's disease. The results of this study showed that the continuous human T lymphocyte cell line MOLT-4 and the continuous monocytic cell line THP-1 were readily infected by Cp in vitro as shown by immunofluorescence microscopy for Cp lipopolysaccharide (LPS). The 16S rRNA expression determined by real-time RT-PCR increased rapidly after infection of either cell line with these bacteria. The THP-1 cells infected with Cp showed increased levels of the immunoregulatory cytokine IL-12 and also of TNFalpha and IL-10 compared to cultures stimulated with heat-killed Cp (KCp) or Escherichia coli LPS as a control. Stimulation of MOLT-4 cells with KCp or E. coli LPS also induced the Th1 cytokines IFNgamma and IL-12 and the Th2 cytokine IL-10, but infection with viable Cp induced higher Th1 cytokine levels. These results suggest that Cp infection induces a predominant Th1 cytokine profile by T cells, in addition to induction of TNFalpha by monocytes/macrophages. Such effects are likely involved in antibacterial immunity against Cp infection.
Collapse
Affiliation(s)
- Yukimitsu Mamata
- Department of Molecular Medicine, University of South Florida, College of Medicine, Tampa, FL 33612-4742, USA
| | | | | | | | | | | |
Collapse
|
36
|
Mussa FF, Chai H, Wang X, Yao Q, Lumsden AB, Chen C. Chlamydia pneumoniae and vascular disease: an update. J Vasc Surg 2006; 43:1301-7. [PMID: 16765261 DOI: 10.1016/j.jvs.2006.02.050] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2006] [Accepted: 02/26/2006] [Indexed: 11/16/2022]
Abstract
Exposure to Chlamydia pneumoniae is extremely common, and its incidence increases with age. C pneumoniae infection is strongly associated with coronary artery disease, as well as with atherosclerosis of the carotid artery, aorta, and peripheral arteries. This association has been shown in seroepidemiologic studies and by direct detection of the organism in atherosclerotic lesions by immunohistochemistry, polymerase chain reaction, electron microscopy, and tissue culture. Animal models of atherosclerosis have been used to study the role of C pneumoniae in the initiation and progression of atherosclerotic disease. The association of this organism with cardiovascular complications has inspired many human trials of antibiotics for the secondary prevention of atherosclerosis. C pneumoniae can infect several types of cells, including circulating macrophages, arterial smooth muscle cells, and vascular endothelial cells, causing the secretion of proinflammatory cytokines and procoagulants by endothelial cells and foam cell formation by infected macrophages. This report reviews the role of C pneumoniae in atherogenesis in light of recent, large antibiotic treatment trials, animal studies, and in vitro studies. The role of Chlamydia heat shock protein as a potential mediator of this harmful effect is also reviewed.
Collapse
Affiliation(s)
- Firas F Mussa
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas 77030, USA
| | | | | | | | | | | |
Collapse
|
37
|
Denlinger LC, Coursin DB, Schell K, Angelini G, Green DN, Guadarrama AG, Halsey J, Prabhu U, Hogan KJ, Bertics PJ. Human P2X7 pore function predicts allele linkage disequilibrium. Clin Chem 2006; 52:995-1004. [PMID: 16613995 DOI: 10.1373/clinchem.2005.065425] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Innate immune response amplification is achieved by leukocyte expression of the purinergic nucleotide receptor P2X7, an extracellular nucleotide-gated pore. Previously, low P2X7 pore activity in whole blood was associated with loss-of-function genotypes in correlation with a decreased ratio of lipopolysaccharide-stimulated tumor necrosis factor-alpha to interleukin-10, of relevance to a variety of infectious and inflammatory disorders. We hypothesized that evaluation of participants with discordance between the P2X7 genotype and pore status would disclose additional alleles, linkage disequilibrium, and novel functional correlates of genotype to phenotype. METHODS Comparison of whole-blood pore results with restriction fragment length polymorphism data for known loss-of-function genotypes from 200 healthy participants optimized the diagnostic threshold for low pore activity by ROC curve analysis. We identified novel alleles and inferred haplotypes by sequencing outlier genomic templates and by linkage analysis. RESULTS With a refined threshold of low activity, a normal pore result had only a 2% probability of association with known loss-of-function variants. By contrast, the positive predictive value of low pore activity was 59% for identifying known alleles. DNA samples from this discordant group contained 28 P2X7 sequence variations. Linkage analysis demonstrated that A1513C, T1729A, and G946A are inherited independently from one another, although these loss-of-function variants are in disequilibrium with other alleles. When we segregated pore activity data according to genotypes, nonsynonymous sequence variations (G474A and A1405G) appeared to exhibit modulatory effects on P2X7 pore activity. CONCLUSIONS Direct analysis of pore activity demonstrates functional interactions between P2X7 alleles. The performance characteristics of the whole-blood pore assay enables correlation of genomic variation with concomitant investigation of functional performance in clinical studies.
Collapse
Affiliation(s)
- Loren C Denlinger
- Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Miyairi I, Byrne GI. Chlamydia and programmed cell death. Curr Opin Microbiol 2006; 9:102-8. [PMID: 16406838 DOI: 10.1016/j.mib.2005.12.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2005] [Accepted: 12/16/2005] [Indexed: 11/18/2022]
Abstract
Discordant views regarding host cell death induction by Chlamydia are likely owing to the different methods used for evaluation of apoptosis. Apoptotic and non-apoptotic death owing to both caspase-dependent and -independent activation of the Bax protein occur late in the productive growth cycle. Evidence also suggests that Chlamydia inhibits apoptosis during productive growth as part of its intracellular survival strategy. This is in part owing to proteolytic degradation of the BH3-only family of pro-apoptotic proteins in the mitochondrial pathway. Chlamydia also inhibits apoptosis during persistent growth or in phagocytes, but induces apoptosis in T cells, which suggests that apoptosis has an immunomodulatory role in chlamydial infections. The contribution of apoptosis in disease pathogenesis remains a focus for future research.
Collapse
Affiliation(s)
- Isao Miyairi
- Department of Molecular Sciences, University of Tennessee Health Science Center, 858 Madison Ave, Memphis, TN 38163, USA
| | | |
Collapse
|
39
|
Liu R, Yamamoto M, Moroi M, Kubota T, Ono T, Funatsu A, Komatsu H, Tsuji T, Hara H, Hara H, Nakamura M, Hirai H, Yamaguchi T. Chlamydia pneumoniae immunoreactivity in coronary artery plaques of patients with acute coronary syndromes and its relation with serology. Am Heart J 2005; 150:681-8. [PMID: 16209964 DOI: 10.1016/j.ahj.2004.11.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2004] [Accepted: 11/13/2004] [Indexed: 11/19/2022]
Abstract
BACKGROUND An association between Chlamydia pneumoniae (Cpn) infection and coronary artery disease has been reported and examined by different techniques. However, its immunoreactivity in coronary artery plaques of patients with acute coronary syndrome (ACS) and its relation with serology are less well defined. METHODS We divided 40 coronary plaque specimens from 40 patients who underwent thrombectomy or directional coronary atherectomy into an ACS group (n = 22) and a non-ACS group (n = 18). Cpn in specimens was detected immunohistochemically and compared quantitatively. Serum immunoglobulin (Ig)A and IgG antibodies to Cpn and high-sensitivity C-reactive protein (hs-CRP) were measured. The relation between serology and immunohistochemical analysis was also investigated. RESULTS Cpn immunopositive cells per square millimeter (Cpn+ cells/mm2) in the ACS group were significantly more numerous than in the non-ACS group (median 7.44 vs 1.50, P = .0018). Cpn IgA seropositivity rates and titers in the ACS group were significantly higher than those in the non-ACS group (86.3% vs 22.2%, P = .0002; median titer 1.403 vs 0.545, P = .003). There were no differences in IgG antibodies between the 2 groups. The hs-CRP values (in milligrams per liter) in ACS group were significantly higher than in non-ACS group (median 2.8 vs 1.2, P = .0019). Serum IgA titers in patients with at least 5 Cpn+ cells/mm2 in the specimens were significantly higher than in patients with fewer Cpn+ cells (median 1.52 vs 0.86, P = .026). There was no difference in serum hs-CRP values in patients with more Cpn+ cells but a trend to an increase. CONCLUSION Immunohistology frequently detected Cpn in coronary plaques; Cpn+ cells were more prevalent in plaques associated with ACS, and Cpn IgA but not IgG titers were increased with ACS and with high densities of Cpn+ cells within plaque.
Collapse
Affiliation(s)
- Ruiqin Liu
- Division of Cardiovascular Medicine, Ohashi Hospital, Toho University School of Medicine, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Okada F, Ando Y, Wakisaka M, Matsumoto S, Mori H. Chlamydia pneumoniae Pneumonia and Mycoplasma pneumoniae Pneumonia. J Comput Assist Tomogr 2005; 29:626-32. [PMID: 16163032 DOI: 10.1097/01.rct.0000167809.89352.93] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The objective of this study was to identify the clinical and pulmonary CT findings associated with Chlamydia pneumoniae pneumonia and to compare them with those of Mycoplasma pneumoniae pneumonia. The clinical features and CT scans of 40 patients with C. pneumoniae pneumonia and 42 patients with M. pneumoniae pneumonia were retrospectively reviewed. There were no significant differences between the two etiologic agents with regard to clinical signs. Chest CT findings in patients with C. pneumoniae pneumonia consisted mainly of ground-glass attenuation (n = 38) and acinar patterns (n = 28). Acinar patterns and pleural effusions (n = 12) were observed significantly more frequently than in patients with M. pneumoniae pneumonia (P < 0.0001, P < 0.039, respectively). CT findings of centrilobular nodules and bronchial wall thickening were significantly less common than in the M. pneumoniae pneumonia patients (P < 0.0001, P < 0.0001, respectively). The CT finding of acinar patterns, although nonspecific, can be considered suggestive of C. pneumoniae pneumonia.
Collapse
Affiliation(s)
- Fumito Okada
- Department of Diagnostic and Interventional Radiology, Oita University Faculty of Medicine, Oita, Japan.
| | | | | | | | | |
Collapse
|
41
|
Schumacher A, Seljeflot I, Lerkerød AB, Sommervoll L, Otterstad JE, Arnesen H. Chlamydia LPS and MOMP seropositivity are associated with different cytokine profiles in patients with coronary heart disease. Eur J Clin Invest 2005; 35:431-7. [PMID: 16008544 DOI: 10.1111/j.1365-2362.2005.01511.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Persistent Chlamydia pneumoniae infection within atherosclerotic plaques are possible stimulators of inflammation in atherosclerosis. Why the microbe develops persistency in some individuals is unknown, but experimental studies in cell cultures and animals have demonstrated the levels of gamma interferon (IFNgamma) and interleukin 10 (IL-10) to be of crucial importance. DESIGN We wanted to evaluate whether Chlamydia seropositivity in patients with coronary heart disease (CHD) (n = 193) was associated with elevated IFNgamma and IL-10. Two methods for detection of Chlamydia antibodies were included as well as analysis of tumour necrosis factor alpha (TNFalpha), soluble vascular cell adhesion molecule 1 (sVCAM-1) and soluble E-selectin for the evaluation of vascular inflammation. RESULTS We found that patients with IgA antibodies towards Chlamydia lipopolysaccharide (LPS) had elevated levels of IFNgamma (P = 0.048), IL-10 (P = 0.029), TNFalpha (P = 0.009) and sE-selectin (P = 0.045), while Chlamydia LPS IgG seropositivity predicted elevated levels of IL-10 (P = 0.013). Patients with IgA antibodies towards C. pneumoniae major outer membrane protein (MOMP) without simultaneous LPS IgA seropositivity had lower levels of IFNgamma and sVCAM-1 when compared to patients with Chlamydia LPS IgA alone (P = 0.005 for IFNgamma, P = 0.016 for VCAM-1) and patients with combined Chlamydia MOMP and LPS IgA seropositivity (P = 0.046 and P = 0.013, respectively). CONCLUSIONS In summary, we demonstrated an association between Chlamydia LPS IgA seropositivity and elevated levels of IFNgamma, IL-10, TNFalpha, sVCAM-1 and sE-selectin in CHD patients that might indicate persistent Chlamydia infection and a proinflammatory state. On the other hand, C. pneumoniae MOMP antibodies were not associated with elevated inflammatory markers and might merely be indicative of past infection, possibly with successful microbe clearance.
Collapse
Affiliation(s)
- A Schumacher
- Department of Microbiolgy and Division of Cardiology, Hospital of Vestfold, Tønsberg, Norway.
| | | | | | | | | | | |
Collapse
|
42
|
Yaraei K, Campbell LA, Zhu X, Liles WC, Kuo CC, Rosenfeld ME. Chlamydia pneumoniae augments the oxidized low-density lipoprotein-induced death of mouse macrophages by a caspase-independent pathway. Infect Immun 2005; 73:4315-22. [PMID: 15972525 PMCID: PMC1168605 DOI: 10.1128/iai.73.7.4315-4322.2005] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2004] [Revised: 02/03/2005] [Accepted: 02/28/2005] [Indexed: 11/20/2022] Open
Abstract
Chlamydia pneumoniae is a common respiratory pathogen that is associated with an increased risk of cardiovascular disease. However, the mechanisms by which C. pneumoniae contributes to cardiovascular disease have not been determined yet. C. pneumoniae infection may accelerate the death of cells within atherosclerotic lesions and contribute to the formation of unstable lesions. To test this hypothesis, the impact of C. pneumoniae infection on the death of lipid-loaded mouse macrophages was investigated. It was observed that RAW 264.7 cells are highly susceptible to the toxic effects of oxidized low-density lipoprotein (LDL) and exhibit markers of cell death within 24 h of treatment with as little as 5 microg/ml oxidized LDL. Subsequent infection with either live C. pneumoniae or heat-killed or UV-inactivated C. pneumoniae at a low multiplicity of infection for 24 to 72 h stimulated both additional binding of annexin V and the uptake of propidium iodide. Thus, C. pneumoniae augments the effects of oxidized LDL on cell death independent of a sustained infection. However, unlike oxidized LDL, C. pneumoniae infection does not activate caspase 3 or induce formation of the mitochondrial transition pore or the fragmentation of DNA, all of which are classical markers of apoptosis. Furthermore, primary bone marrow macrophages isolated from mice deficient in Toll-like receptor 2 (TLR-2) but not TLR-4 are resistant to C. pneumoniae-induced death. These data suggest that C. pneumoniae kills cells by a caspase-independent pathway and that the process is potentially mediated by activation of TLR-2.
Collapse
Affiliation(s)
- Kambiz Yaraei
- Department of Pathobiology, Box 353410, University of Washington, Seattle, Washington 98195, USA
| | | | | | | | | | | |
Collapse
|
43
|
Littman AJ, Jackson LA, Vaughan TL. Chlamydia pneumoniae and lung cancer: epidemiologic evidence. Cancer Epidemiol Biomarkers Prev 2005; 14:773-8. [PMID: 15824142 DOI: 10.1158/1055-9965.epi-04-0599] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Chlamydia pneumoniae is a common cause of acute respiratory infection and has been hypothesized to cause several chronic diseases, including lung cancer. The purpose of this article is to identify, describe, and critically examine the published studies on the association between C. pneumoniae infection and risk of lung cancer. In the six studies identified, previous C. pneumoniae infection was defined on the basis of serologic criteria, which varied between studies. All studies reported elevated relative risk estimates for the association of serologic evidence of infection and risk of lung cancer. The three studies in which past infection was defined based on testing of prediagnostic blood specimens tended to have weaker results (odds ratio range, 1.2-2.1) than those based on postdiagnostic blood specimens (odds ratio range, 1.4-9.9). Selection bias, measurement error, and inadequate control for confounding are concerns in some of these studies. Nevertheless, results were relatively consistent, supporting a causal association. Inflammation caused by chronic infection with C. pneumoniae may be involved in the carcinogenic process but this relationship will be difficult to further define through serologic data. To better understand the nature of this association, both experimental study designs, such as those based on animal models or randomized controlled antibiotic treatment trials in humans, and observational study designs (e.g., studies that involve detection of C. pneumoniae in pulmonary specimens obtained before cancer onset) could be explored and may shed additional light on this important association.
Collapse
Affiliation(s)
- Alyson J Littman
- Department of Epidemiology, University of Washington, Seattle, Washington, USA.
| | | | | |
Collapse
|
44
|
Flórido M, Pearl JE, Solache A, Borges M, Haynes L, Cooper AM, Appelberg R. Gamma interferon-induced T-cell loss in virulent Mycobacterium avium infection. Infect Immun 2005; 73:3577-86. [PMID: 15908387 PMCID: PMC1111831 DOI: 10.1128/iai.73.6.3577-3586.2005] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Infection by virulent Mycobacterium avium caused progressive severe lymphopenia in C57BL/6 mice due to increased apoptosis rates. T-cell depletion did not occur in gamma interferon (IFN-gamma)-deficient mice which showed increased T-cell numbers and proliferation; in contrast, deficiency in nitric oxide synthase 2 did not prevent T-cell loss. Although T-cell loss was IFN-gamma dependent, expression of the IFN-gamma receptor on T cells was not required for depletion. Similarly, while T-cell loss was optimal if the T cells expressed IFN-gamma, CD8(+) T-cell depletion could occur in the absence of T-cell-derived IFN-gamma. Depletion did not require that the T cells be specific for mycobacterial antigen and was not affected by deficiencies in the tumor necrosis factor receptors p55 or p75, the Fas receptor (CD95), or the respiratory burst enzymes or by forced expression of bcl-2 in hematopoietic cells.
Collapse
Affiliation(s)
- Manuela Flórido
- Laboratory of Microbiology and Immunology of Infection, Institute for Molecular and Cell Biology, University of Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal
| | | | | | | | | | | | | |
Collapse
|
45
|
Greub G, Desnues B, Raoult D, Mege JL. Lack of microbicidal response in human macrophages infected with Parachlamydia acanthamoebae. Microbes Infect 2005; 7:714-9. [PMID: 15826869 DOI: 10.1016/j.micinf.2005.01.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2004] [Revised: 12/20/2004] [Accepted: 01/20/2005] [Indexed: 11/19/2022]
Abstract
Parachlamydia acanthamoebae is an obligate intracellular bacterium naturally infecting free-living amoebae. This potential agent of pneumonia resists destruction by human macrophages, inducing their death by apoptosis. However, the strategy used by Parachlamydia to escape the microbicidal effectors of macrophages remains unknown. In this work, we defined the effect of Parachlamydia on the cytokine secretion (measured in culture supernatants by immunoassays), on the oxidative burst (measured using a fluorogenic probe), on the production of nitric oxide (Griess assay), and on transcription of glutaredoxin, tumor necrosis factor alpha (TNF-alpha) and indoleamine 2,3-dioxygenase (IDO). Living Parachlamydia did not induce an oxidative burst, the secretion of cytokines such as IL-6, IL-10 and TNF-alpha, nor the transcription of TNF-alpha in macrophages. However, living Parachlamydia led to increased secretion of IL-1beta and increased transcription of glutaredoxin, an anti-oxidant. The transcription of IDO, an enzyme, which catalyzes decyclization of l-tryptophan, was slightly up-regulated. Heat-inactivated Parachlamydia did not induce either an oxidative burst or the production of pro-inflammatory cytokines. In contrast to living bacteria, it had no effect on the IL-1beta release, but it induced IL-10 secretion. In conclusion, after being internalized, Parachlamydia may resist the microbicidal effectors of human macrophages through not inducing oxidative burst and pro-inflammatory cytokine production.
Collapse
Affiliation(s)
- Gilbert Greub
- Unité des Rickettsies, Faculté de médecine, Université de la Méditerranée, Marseille, France.
| | | | | | | |
Collapse
|
46
|
Xiao Y, Zhong Y, Su H, Zhou Z, Chiao P, Zhong G. NF-κB Activation Is Not Required forChlamydia trachomatisInhibition of Host Epithelial Cell Apoptosis. THE JOURNAL OF IMMUNOLOGY 2005; 174:1701-8. [PMID: 15661934 DOI: 10.4049/jimmunol.174.3.1701] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Chlamydia trachomatis, an obligate intracellular bacterial species, is known to inhibit host cell apoptosis. However, the chlamydial antiapoptotic mechanism is still not clear. Because NF-kappaB activation is antiapoptotic, we tested the potential role of NF-kappaB activation in chlamydial antiapoptotic activity in the current study. First, no obvious NF-kappaB activation was detected in the chlamydia-infected cells when these cells were resistant to apoptosis induced via either the intrinsic or extrinsic apoptosis pathways. Second, inhibition of NF-kappaB activation with pharmacologic reagents failed to block the chlamydial antiapoptotic activity. Finally, NF-kappaB p65 gene deletion did not prevent chlamydia from inhibiting host cell apoptosis. These observations together have demonstrated that NF-kappaB activation is not required for the chlamydial antiapoptotic activity.
Collapse
Affiliation(s)
- Yangming Xiao
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | | | | | | | | | | |
Collapse
|
47
|
Zhang Y, Wang C, Zhang Y, Sun M. C6 glioma cells retrovirally engineered to express IL-18 and Fas exert FasL-dependent cytotoxicity against glioma formation. Biochem Biophys Res Commun 2004; 325:1240-5. [PMID: 15555559 DOI: 10.1016/j.bbrc.2004.10.165] [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] [Received: 10/18/2004] [Indexed: 12/19/2022]
Abstract
The decreased antitumor immune response significantly contributes to the progression of glioma. To evaluate whether the antitumor immunity is restored by stable co-expression of IL-18 and Fas receptor, we retrovirally introduced these two genes into rat C6 glioma cells. We found that IL-18-transduced glioma cells secreted IL-18 and induced PBMC IFN-gamma production in vitro. We also found that Fas-transduced glioma cells were susceptible to Fas-mediated apoptosis. In vivo, we found that IL-18 expression and Fas expression synergistically inhibited C6 cell tumorigenesis with the glioma cells being subcutaneously injected in rat flank. Furthermore, we found that co-expression of IL-18 and Fas also produced a marked survival advantage with the rats being intracerebrally implanted with the glioma cells. Finally, we demonstrated that FasL-dependent PBMC cytotoxicity participated in the anti-glioma immunity induced by IL-18 and Fas expression. Taken together, these findings demonstrate that increasing IL-18 production in tumor microenvironment and prompting functional Fas receptor expression of tumor cells could enhance FasL-dependent cytotoxic antitumor immunity.
Collapse
Affiliation(s)
- Yunhong Zhang
- Beijing Neurosurgical Institute, Capital University of Medical Science, Beijing 100050, China.
| | | | | | | |
Collapse
|
48
|
Sun Y, Pei W, Welte T, Wu Y, Ye S, Yang Y. Cytomegalovirus infection is associated with elevated interleukin-10 in coronary artery disease. Atherosclerosis 2004; 179:133-7. [PMID: 15721019 DOI: 10.1016/j.atherosclerosis.2004.09.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2004] [Revised: 09/19/2004] [Accepted: 09/28/2004] [Indexed: 11/25/2022]
Abstract
Previous studies show that cytomegalovirus (CMV) infection could increase the production of inflammatory cytokines in coronary artery disease (CAD). However, little is known about the influence of CMV infection on interleukin-10 (IL-10) levels in CAD. We attempted to investigate the relationships between CMV infection and serum IL-10 levels in patients with CAD. CMV IgG and serum levels of IL-10 were measured with ELISA in patients with CAD (n=463) and smooth coronary artery controls documented by coronary arteriography (n=125). Subjects were dichotomized according to calculated median level of IL-10 (6.84 pg/ml) in different groups or subgroups. The seropositivity of CMV IgG was more frequently found in the high IL-10 group than the low IL-10 group (46.8% versus 30.4%, P<0.001). The prevalence of CMV infection was significantly higher in the high IL-10 group than the low IL-10 group among the patients with CAD (48.1% versus 28.6%, P<0.001), but among the controls (40.4% versus 35.6%, P=0.588). On multiple logistic regression analysis, the adjusted odds ratio (95% confidence intervals) of high IL-10 associated with CMV infection was 2.3 (1.6-3.4, P<0.001) in the patients with CAD, and 1.1 (0.5-2.5, P=0.83) in the controls. We found a significant association of CMV infection with elevated IL-10 in the patients with CAD; therefore, we propose that changes in the immune response to CMV are a compounding factor in CAD.
Collapse
Affiliation(s)
- Yuhua Sun
- Cardiovascular Institute & Fu Wai Heart Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100037, China
| | | | | | | | | | | |
Collapse
|
49
|
Littman AJ, White E, Jackson LA, Thornquist MD, Gaydos CA, Goodman GE, Vaughan TL. Chlamydia pneumoniae Infection and Risk of Lung Cancer. Cancer Epidemiol Biomarkers Prev 2004. [DOI: 10.1158/1055-9965.1624.13.10] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Abstract
Infection with Chlamydia pneumoniae may be associated with an increased risk of lung cancer. We conducted a matched case-control study (508 pairs) nested within a large prospective study to investigate whether IgA antibody titers to C. pneumoniae measured by the microimmunofluorescence test are associated with lung cancer risk after controlling for confounders. Individuals with antibody titers ≥16 had 1.2 times the risk of lung cancer (95% confidence interval, 0.9-1.6) compared to those with lower titers. There was a significant trend (P = 0.007) of increasing odds ratios with increasing IgA titers primarily due to an odds ratio of 2.8 (95% confidence interval, 1.1-6.7) associated with titers ≥256. Lung cancer risk associated with IgA titers ≥16 was stronger among former smokers. To better understand predictors of IgA seropositivity, we also examined demographic, lifestyle, dietary, and medical correlates of IgA titers ≥16 among controls. Those with race not classified as White or Black were more likely to have IgA titers ≥16; there were no significant differences in seropositivity by smoking behaviors. In summary, the adjusted odds ratio for lung cancer associated with IgA titers ≥16 was compatible with a weakly positive association, although nondifferential measurement error of antibody titers may have resulted in a conservative bias. Future studies using precise measures of chronic C. pneumoniae status are needed to better determine the role of this organism in the etiology of lung cancer.
Collapse
Affiliation(s)
- Alyson J. Littman
- 1Department of Epidemiology, University of Washington, Seattle, WA
- 2Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
| | - Emily White
- 1Department of Epidemiology, University of Washington, Seattle, WA
- 2Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
| | - Lisa A. Jackson
- 1Department of Epidemiology, University of Washington, Seattle, WA
- 3Center for Health Studies, Group Health Cooperative, Seattle, WA
| | - Mark D. Thornquist
- 2Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
| | | | - Gary E. Goodman
- 2Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
- 5Swedish Cancer Institute, Seattle, WA
| | - Thomas L. Vaughan
- 1Department of Epidemiology, University of Washington, Seattle, WA
- 2Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
| |
Collapse
|
50
|
Netea MG, Kullberg BJ, Jacobs LEH, Verver-Jansen TJG, van der Ven-Jongekrijg J, Galama JMD, Stalenhoef AFH, Dinarello CA, Van der Meer JWM. Chlamydia pneumoniae stimulates IFN-gamma synthesis through MyD88-dependent, TLR2- and TLR4-independent induction of IL-18 release. THE JOURNAL OF IMMUNOLOGY 2004; 173:1477-82. [PMID: 15240744 DOI: 10.4049/jimmunol.173.2.1477] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Recent studies suggest that inflammation plays a central role in the pathogenesis of atherosclerosis, and IFN-gamma is a prominent proinflammatory mediator in this context. However, it is unclear what stimuli are responsible for initial stimulation of IFN-gamma synthesis in the vessel wall. In the present study, we demonstrate that Chlamydia pneumoniae is an important stimulus for IFN-gamma synthesis, and this production depends on release of endogenous IL-18, IL-12, and IL-1, but not of TNF. The production of the proinflammatory cytokines TNF and IL-1beta from PBMC by sonicated C. pneumoniae was mediated through TLR2-dependent pathways. In contrast, C. pneumoniae stimulated the production of IL-18 through MyD88-dependent, TLR2-, TLR4-, and CD14-independent pathways, mediated by posttranscriptional mechanisms not involving de novo protein synthesis. In conclusion, C. pneumoniae is a potent stimulus of IFN-gamma production, in addition to the proinflammatory cytokines TNF and IL-1beta, which may contribute to its proatherogenic effects. Most interestingly, C. pneumoniae is also a potent inducer of IL-18 production through pathways independent of TLR2 and TLR4.
Collapse
Affiliation(s)
- Mihai G Netea
- Department of Medicine, University Medical Center Nijmegen, The Netherlands.
| | | | | | | | | | | | | | | | | |
Collapse
|