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Ha EK, Jin JO, Kim JH, Shin J, Lee GC, Cha HR, Choi SH, Han MY. Age-related effects of Mycoplasma pneumoniae infection and subsequent asthma exacerbation in children. Pediatr Pulmonol 2024; 59:1569-1577. [PMID: 38708969 DOI: 10.1002/ppul.26907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 01/11/2024] [Accepted: 01/31/2024] [Indexed: 05/07/2024]
Abstract
BACKGROUND Mycoplasma pneumoniae causes community-acquired pneumonia in children and increases asthma risk, but large studies are lacking. OBJECTIVE To assess the link between M. pneumoniae infection and to asthma exacerbation, in children with allergies, and age of infection impact. METHODS This retrospective cohort study analyzed medical records of South Korean children between January 2002 and December 2017. The study's exposure was hospitalization with an M. pneumoniae-related diagnosis, and the outcome was defined as asthma exacerbation, confirmed by hospitalization at least 6 months after M. pneumoniae infection, with alternative validation using asthma diagnosis and systemic steroid prescription records. Hazard ratios (HRs) for asthma exacerbation risk were estimated for the matched cohort using a Cox proportional hazards model stratified by allergic comorbidities. Time-dependent covariates and age-stratified exposure groups were used to calculate odds ratios. RESULTS The study included 84,074 children with M. pneumoniae infection and 336,296 unexposed children. Follow-up for 12.2 ± 2.3 years found the exposed group had a significant risk of asthma exacerbation (HR 2.86, 95% confidence interval [CI] 2.67-3.06) regardless of allergic comorbidities. The risk was highest (over threefold) in children infected between 24 and 71 months. Sensitivity analysis using an alternative definition of the outcome showed an HR of 1.38 (95% CI 1.35-1.42), further supporting the association between M. pneumoniae infection and asthma exacerbation. CONCLUSION M. pneumoniae infection was significantly associated with an increased risk of subsequent asthma exacerbation regardless of allergic comorbidities. Further research needed for understanding and confirmation.
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Affiliation(s)
- Eun Kyo Ha
- Department of Pediatrics, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea, Seoul, Korea
| | - Joo Ok Jin
- Department of Pediatrics, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea, Seoul, Korea
| | - Ju Hee Kim
- Department of Pediatrics, Kyung Hee University Medical Center, Kyung Hee University College of Medicine, Seoul, Korea
| | - Jeewon Shin
- Department of Pediatrics, Bundang CHA Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Gi Chun Lee
- School of Computer Science and Engineering, Konkuk University, Seoul, Korea
| | - Hye Ryeong Cha
- Department of Computer Science and Engineering, Sungkyunkwan University, Suwon, Korea
| | - Sun Hee Choi
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University College of Medicine, Seoul, Korea
| | - Man Yong Han
- Department of Pediatrics, Bundang CHA Medical Center, CHA University School of Medicine, Seongnam, Korea
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Xiao F, Zhou J, Sun C, Huang X, Zheng B, Fu J, Jia N, Xu Z, Cui X, Wang Y. Loop-Mediated Isothermal Amplification Coupled With Nanoparticle-Based Biosensor: A Rapid and Sensitive Method to Detect Mycoplasma pneumoniae. Front Cell Infect Microbiol 2022; 12:882855. [PMID: 35873146 PMCID: PMC9299420 DOI: 10.3389/fcimb.2022.882855] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 06/06/2022] [Indexed: 11/13/2022] Open
Abstract
Mycoplasma pneumoniae (MP), the causative agent of MP pneumonia (MPP), has posed a substantial burden to public health owing to a lack of rapid and effective diagnostic methods. Here, we designed a loop-mediated isothermal amplification (LAMP)-based assay, termed LAMP, combined with a nanoparticle-based lateral flow biosensor (LAMP-LFB) for rapid and sensitive diagnosis of MP.-LAMP-LFB included a set of six primers targeting the community-acquired respiratory distress syndrome (CARDS) toxin gene and was performed optimally at 63°C for only 30 min. The resulting LAMP products could be visually indicated by LFB within 2 min, thus the whole process could be accomplished within an hour. MP-LAMP-LFB's sensitivity was 50 fg per reaction, which was in complete accordance with these results obtained from real-time turbidity and visual detection reagent (VDR). MP-LAMP-LFB had no cross-reactivity with other pathogens that had similar clinical presentations. Our assay was further validated using 100 nasopharyngeal swab samples collected from children suspected of MPP, and the result was compared with the real-time PCR method. With a positive rate of 50%, the data indicated that MP-LAMP-LFB is a sensitive test for MP detection in clinical settings. Collectively, the MP-LAMP-LFB assay targeting the CARDS toxin gene was a rapid, highly sensitive, and specific test that could be widely applied in point-of-care settings and basic medical facilities in rural areas.
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Affiliation(s)
- Fei Xiao
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Juan Zhou
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Chunrong Sun
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Xiaolan Huang
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Baoying Zheng
- Department of Respiratory Disease, Capital Institute of pediatrics, Beijing, China
| | - Jin Fu
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Nan Jia
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Zheng Xu
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Xiaodai Cui
- Experimental research center, Capital Institute of pediatrics, Beijing, China
| | - Yi Wang
- Experimental research center, Capital Institute of pediatrics, Beijing, China
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Neutrophil-Mediated Lung Injury Both via TLR2-Dependent Production of IL-1α and IL-12 p40, and TLR2-Independent CARDS Toxin after Mycoplasma pneumoniae Infection in Mice. Microbiol Spectr 2021; 9:e0158821. [PMID: 34937175 PMCID: PMC8694186 DOI: 10.1128/spectrum.01588-21] [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] [Indexed: 12/21/2022] Open
Abstract
Mycoplasma pneumoniae (Mp) residing extracellularly in the respiratory tract is the primary cause of bacterial community-acquired pneumonia in humans. However, the detailed pathological mechanism of Mp infection, especially inflammation in the lung, remains unclear. This study examined the role of the neutrophils in the inflammation of Mp-induced pneumonia in mice and the mechanism of neutrophil infiltration into the lungs in the Mp-induced pneumonia. We observed massive infiltration of neutrophils in the bronchoalveolar lavage fluid (BALF) and lung injury after the Mp challenge. The neutrophils were shown to contribute to lung injury in Mp pneumonia but were not involved in eliminating Mp, suggesting that neutrophils are detrimental to the host in Mp pneumonia. Mp also induced the production of inflammatory cytokines and chemokines in the BALF in a toll-like receptor 2 (TLR2)-dependent manner. Particularly, both interleukin (IL)-1α and IL-12 p40 played a crucial role in neutrophil infiltration into the BALF in a coordinated manner. Both IL-1α and IL-12 p40 were released from the alveolar macrophages depending on the TLR2 and reactive oxygen species. In addition, the community-acquired respiratory distress syndrome (CARDS) toxin from Mp were found to induce neutrophil infiltration into BALF in a TLR2-independent and IL-1α-dependent manner. Collectively, the TLR2-dependent production of both IL-1α and IL-12 p40, and CARDS toxin have been elucidated to play an important role in neutrophil infiltration into the lungs subsequently leading to the lung injury upon Mp infection in mice. These data will aid in the development of therapeutics and vaccines for Mp pneumonia. IMPORTANCE Although Mp-induced pneumonia is usually a self-limiting disease, refractory life-threatening pneumonia is often induced. In addition, the development of alternative therapeutic strategies for Mp is expected because of the emergence of antibiotic-resistant Mp. However, the lack of knowledge regarding the pathogenesis of Mp-induced pneumonia, especially inflammation upon the Mp infection, makes it tedious to design novel therapeutics and vaccines. For example, although neutrophil infiltration is widely recognized as one of the characteristics of Mp-induced pneumonia, the precise role of neutrophils in the aggravation of Mp pneumonia remains unclear. This study showed that the infiltration of neutrophils in the lungs is detrimental to the host in Mp-induced pneumonia in mice. Furthermore, the TLR2-dependent IL-1α and IL-12 p40 production, and CARDS toxin play important roles in neutrophil infiltration into the lung, following lung injury. Our findings apply to the rational design of novel therapeutics and vaccines against Mp.
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Su X, You X, Luo H, Liang K, Chen L, Tian W, Ye Z, He J. Community-Acquired Respiratory Distress Syndrome Toxin: Unique Exotoxin for M. pneumoniae. Front Microbiol 2021; 12:766591. [PMID: 34867898 PMCID: PMC8640204 DOI: 10.3389/fmicb.2021.766591] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 10/19/2021] [Indexed: 11/13/2022] Open
Abstract
Mycoplasma pneumoniae infection often causes respiratory diseases in humans, particularly in children and adults with atypical pneumonia and community-acquired pneumonia (CAP), and is often exacerbated by co-infection with other lung diseases, such as asthma, bronchitis, and chronic obstructive pulmonary disorder. Community-acquired respiratory distress syndrome toxin (CARDS TX) is the only exotoxin produced by M. pneumoniae and has been extensively studied for its ADP-ribosyltransferase (ADPRT) activity and cellular vacuolization properties. Additionally, CARDS TX induces inflammatory responses, resulting in cell swelling, nuclear lysis, mucus proliferation, and cell vacuolization. CARDS TX enters host cells by binding to the host receptor and is then reverse transported to the endoplasmic reticulum to exert its pathogenic effects. In this review, we focus on the structural characteristics, functional activity, distribution and receptors, mechanism of cell entry, and inflammatory response of CARDS TX was examined. Overall, the findings of this review provide a theoretical basis for further investigation of the mechanism of M. pneumoniae infection and the development of clinical diagnosis and vaccines.
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Affiliation(s)
- Xiaoling Su
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Xiaoxing You
- Institute of Pathogenic Biology, Hengyang Medical School, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, China
| | - Haodang Luo
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Keying Liang
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Li Chen
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Wei Tian
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Zufeng Ye
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jun He
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
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Wagshul FA, Brown DT, Schultek NM, Hahn DL. Outcomes of Antibiotics in Adults with "Difficult to Treat" Asthma or the Overlap Syndrome. J Asthma Allergy 2021; 14:703-712. [PMID: 34163182 PMCID: PMC8216074 DOI: 10.2147/jaa.s313480] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/26/2021] [Indexed: 01/10/2023] Open
Abstract
Purpose Macrolides are a recommended treatment option for severe asthma, but data for “difficult-to-treat” asthma, the asthma-COPD “overlap” syndrome, and treatment duration beyond one year are lacking. We present long-term data from community practice experience providing insights for practice and research. Methods We report data from (1) baseline (pre-treatment) chart review of antibiotic-treated asthma patients and (2) follow-up telephone interviews documenting severe exacerbations (NIH criteria), Asthma Control Test (ACT) scores, and asthma controller use at baseline and follow-up, analyzed using a “before-after” model. Results A total of 101 patients (mean age 55.6 years (Sd 16.8), 66 females) were included. None had ever taken high dose inhaled corticosteroids and 79 (78.2%) were severely uncontrolled (ACT score ≤15) before treatment. Coexisting COPD was present in 62 (61.4%) patients. Azithromycin or azithromycin plus doxycycline was primarily prescribed with a median treatment duration of 12 months and median follow-up duration of 22 months. Severe exacerbations in the month before treatment occurred in 50.5% vs 17.8% at follow-up (P<0.0001). Mean ACT score increased from 12.2 to 20.6 (P<0.0001). The number of patients taking controller medications decreased (P<0.0001 for inhaled corticosteroids; P<0.001 for long-acting beta agonist/long-acting muscarinic antagonist; P<0.05 for leukotriene receptor antagonists). Of the 79 severely uncontrolled patients, 51 (64.6%) became controlled at follow-up, and of these 51, 27 (52.9%) continued to take antibiotics while 24 (47.1%) had discontinued antibiotics earlier yet remained controlled. Conclusion Antibiotic treatment may be beneficial in a significant proportion of “difficult to treat” asthma patients beyond one year, including some patients with the overlap syndrome and/or who fail to meet criteria for refractoriness. ![]()
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Ramasamy K, Balasubramanian S, Kirkpatrick A, Szabo D, Pandranki L, Baseman JB, Kannan TR. Mycoplasma pneumoniae CARDS toxin exploits host cell endosomal acidic pH and vacuolar ATPase proton pump to execute its biological activities. Sci Rep 2021; 11:11571. [PMID: 34078958 PMCID: PMC8172646 DOI: 10.1038/s41598-021-90948-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 05/19/2021] [Indexed: 11/09/2022] Open
Abstract
Mycoplasma pneumoniae is the leading cause of bacterial community-acquired pneumonia among hospitalized children in the United States. It is also responsible for a spectrum of other respiratory tract disorders and extrapulmonary manifestations in children and adults. The main virulence factor of M. pneumoniae is a 591 amino acid multifunctional protein called Community Acquired Respiratory Distress Syndrome (CARDS) toxin. The amino terminal region of CARDS toxin (N-CARDS) retains ADP-ribosylating activity and the carboxy region (C-CARDS) contains the receptor binding and vacuolating activities. After internalization, CARDS toxin is transported in a retrograde manner from endosome through the Golgi complex into the endoplasmic reticulum. However, the mechanisms and criteria by which internalized CARDS toxin is transported and activated to execute its cytotoxic effects remain unknown. In this study, we used full-length CARDS toxin and its mutant and truncated derivatives to analyze how pharmacological drugs that alter pH of intracellular vesicles and electrical potential across vesicular membranes affect translocation of CARDS toxin in mammalian cells. Our results indicate that an acidic environment is essential for CARDS toxin retrograde transport to endoplasmic reticulum. Moreover, retrograde transport facilitates toxin clipping and is required to induce vacuole formation. Additionally, toxin-mediated cell vacuolation is strictly dependent on the function of vacuolar type-ATPase.
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Affiliation(s)
- Kumaraguruparan Ramasamy
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Sowmya Balasubramanian
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Alejandra Kirkpatrick
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Daniel Szabo
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Lavanya Pandranki
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Joel B Baseman
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - T R Kannan
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health San Antonio, San Antonio, TX, 78229, USA.
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Lee KL, Lee CM, Yang TL, Yen TY, Chang LY, Chen JM, Lee PI, Huang LM, Lu CY. Severe Mycoplasma pneumoniae pneumonia requiring intensive care in children, 2010-2019. J Formos Med Assoc 2020; 120:281-291. [PMID: 32948415 DOI: 10.1016/j.jfma.2020.08.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 07/30/2020] [Accepted: 08/09/2020] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND/PURPOSE Despite the high prevalence of Mycoplasma pneumoniae infections, reports on severe life-threatening M. pneumoniae pneumonia (MPP) in children are limited. METHODS We retrospectively enrolled pediatric patients with PCR-positive MPP requiring ICU admission in a children's hospital in Taipei, Taiwan from Jun 2010 to October 2019. Clinical manifestations and laboratory data of severe MPP were analyzed. Macrolide susceptibility was determined by genotyping, and its relationship with clinical manifestations was also analyzed. RESULTS Approximately 5% (34/658) children hospitalized for MPP required ICU admission. Compared with non-ICU cases (n = 291), ICU cases (n = 34) were associated with more underlying conditions, more pleural effusion, longer fever duration, longer hospital stay, the requirement of second-line antibiotic treatment, and delayed effective and second-line antibiotic treatment. Macrolide resistance was similar in ICU and non-ICU groups (53% vs 53%; p = 0.986). In severe MPP, patients requiring endotracheal intubation were associated with more septic shock, empyema, ARDS, prolonged fever after effective antibiotic treatment, delayed second-line and effective antibiotic treatment. In 18 of the 22 patients with pleural fluid analysis, the pleural effusion was alkaline (pH > 7.7) and lymphocyte-predominant. CONCLUSION M. pneumoniae infection can cause severe life-threatening pneumonia in children. Delayed effective and second-line antibiotic treatments are associated with severe life-threatening MPP.
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Affiliation(s)
- Kuan-Lin Lee
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Chieh-Ming Lee
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan; Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Te-Liang Yang
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Ting-Yu Yen
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Luan-Yin Chang
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Jong-Min Chen
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Ping-Ing Lee
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Li-Min Huang
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
| | - Chun-Yi Lu
- Division of Pediatric Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan.
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Li J, Xu P, Wang L, Feng M, Chen D, Yu X, Lu Y. Molecular biology of BPIFB1 and its advances in disease. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:651. [PMID: 32566588 PMCID: PMC7290611 DOI: 10.21037/atm-20-3462] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Bactericidal/permeability-increasing (BPI)-fold-containing family B member 1 (BPIFB1), also known as long-palate lung and nasal epithelium clone 1 (LPLUNC1), belongs to the BPI-fold-containing family, is a newly discovered natural immune protection molecule, which, having the function of bactericidal and osmotic enhancement protein domain, can respond to the external physical and chemical stimuli. The gene of BPIFB1 is located at chromosome 20q11.21-20q11.22, and contains 16 exons and 15 introns, encoding 484 amino acids. The 5' terminal of the BPIFB1 protein has a signal peptide sequence composed of 19 amino acids. BPIFB1 is abnormally expressed in nasopharyngeal carcinoma (NPC), gastric cancer, and other cancer tissues, regulate chronic infections and inflammation, indicating that it may play an important role in the development of tumors. Meanwhile, BPIFB1 has well-recognized roles in sensing and responding to Gram-negative bacteria due to its structural similarity with BPI protein and lipopolysaccharide (LPS)-binding protein, both of which are innate immune molecules with recognized roles in sensing and responding to Gram-negative bacteria, so it can regulate cystic fibrosis (CF), chronic obstructive pulmonary disease (COPD), asthma, and other respiratory diseases. In this article, we will discuss the progress of BPIFB1 in a variety of diseases and fully understand its function.
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Affiliation(s)
- Jie Li
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
| | - Peng Xu
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
| | - Lingwei Wang
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
| | - Mengjie Feng
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
| | - Dandan Chen
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
| | - Xiu Yu
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
| | - Yongzhen Lu
- Key Laboratory of Shenzhen Respiratory Disease, Shenzhen Institute of Respiratory Disease, Shenzhen People's Hospital (The First Affiliated Hospital of Southern University of Science and Technology, The Second Clinical Medical College of Jinan University), Shenzhen, China
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Balasubramanian S, Pandranki L, Maupin S, Ramasamy K, Taylor AB, Hart PJ, Baseman JB, Kannan TR. Disulfide bond of Mycoplasma pneumoniae community-acquired respiratory distress syndrome toxin is essential to maintain the ADP-ribosylating and vacuolating activities. Cell Microbiol 2019; 21:e13032. [PMID: 30977272 DOI: 10.1111/cmi.13032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 03/19/2019] [Accepted: 04/03/2019] [Indexed: 01/13/2023]
Abstract
Mycoplasma pneumoniae is the leading cause of bacterial community-acquired pneumonia among hospitalised children in United States and worldwide. Community-acquired respiratory distress syndrome (CARDS) toxin is a key virulence determinant of M. pneumoniae. The N-terminus of CARDS toxin exhibits ADP-ribosyltransferase (ADPRT) activity, and the C-terminus possesses binding and vacuolating activities. Thiol-trapping experiments of wild-type (WT) and cysteine-to-serine-mutated CARDS toxins with alkylating agents identified disulfide bond formation at the amino terminal cysteine residues C230 and C247. Compared with WT and other mutant toxins, C247S was unstable and unusable for comparative studies. Although there were no significant variations in binding, entry, and retrograde trafficking patterns of WT and mutated toxins, C230S did not elicit vacuole formation in intoxicated cells. In addition, the ADPRT domain of C230S was more sensitive to all tested proteases when compared with WT toxin. Despite its in vitro ADPRT activity, the reduction of C230S CARDS toxin-mediated ADPRT activity-associated IL-1β production in U937 cells and the recovery of vacuolating activity in the protease-released carboxy region of C230S indicated that the disulfide bond was essential not only to maintain the conformational stability of CARDS toxin but also to properly execute its cytopathic effects.
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Affiliation(s)
- Sowmya Balasubramanian
- Department of Microbiology, Immunology and Molecular Genetics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Lavanya Pandranki
- Department of Microbiology, Immunology and Molecular Genetics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Suzanna Maupin
- Department of Microbiology, Immunology and Molecular Genetics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Kumaraguruparan Ramasamy
- Department of Microbiology, Immunology and Molecular Genetics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Alexander B Taylor
- Department of Biochemistry and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX.,X-ray Crystallography Core Laboratory, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Peter John Hart
- Department of Biochemistry and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, TX.,X-ray Crystallography Core Laboratory, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Joel B Baseman
- Department of Microbiology, Immunology and Molecular Genetics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Thirumalai R Kannan
- Department of Microbiology, Immunology and Molecular Genetics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
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10
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Chen S, Golam S, Myers J, Bly C, Smolen H, Xu X. Systematic literature review of the clinical, humanistic, and economic burden associated with asthma uncontrolled by GINA Steps 4 or 5 treatment. Curr Med Res Opin 2018; 34:2075-2088. [PMID: 30047292 DOI: 10.1080/03007995.2018.1505352] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE This study sought to characterize the epidemiologic, clinical, humanistic, and economic burden of patients with asthma uncontrolled by GINA Steps 4 or 5 treatment (severe, uncontrolled asthma [SUA]). METHODS A systematic literature review adhering to PRISMA guidelines was performed. Relevant publications were searched for in MEDLINE and EMBASE from January 2004 to September 2016 and in a conference proceedings database from January 2012 to October 2016. Studies were screened using the Population, Intervention, Comparator, Outcomes, Study Design, and Time (PICOS-T) framework. Studies of SUA with observational (prospective and retrospective), randomized, or nonrandomized study designs; adult patient populations; sample sizes ≥20 patients; epidemiologic or clinical outcomes, patient-reported outcomes (PROs), or economic outcomes were included. For our analysis, SUA was defined as inadequate control of asthma, despite the use of medium- to high-dosage inhaled corticosteroids and at least one additional treatment. RESULTS A total of 195 articles reporting unique study populations were included. Prevalence of SUA was as great as 87.4% for patients with severe asthma, although values varied depending on the criteria used to define asthma control. Compared with patients with severe asthma who were controlled, patients with SUA experienced more symptoms, night-time awakenings, rescue medication use, and worse PROs. SUA-associated costs were 3-times greater than costs for patients with severe, controlled disease. CONCLUSION Despite the availability of approved asthma treatments, this literature analysis confirms that SUA poses a substantial epidemiologic, clinical, humanistic, and economic burden. Published data are limited for certain aspects of SUA, highlighting a need for further research.
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Affiliation(s)
| | | | - Julie Myers
- c Medical Decision Modeling Inc. , Indianapolis , IN, USA
| | - Chris Bly
- c Medical Decision Modeling Inc. , Indianapolis , IN, USA
| | - Harry Smolen
- c Medical Decision Modeling Inc. , Indianapolis , IN, USA
| | - Xiao Xu
- a AstraZeneca , Gaithersburg , MD, USA
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11
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Katsoulis K, Ismailos G, Kipourou M, Kostikas K. Microbiota and asthma: Clinical implications. Respir Med 2018; 146:28-35. [PMID: 30665515 DOI: 10.1016/j.rmed.2018.11.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 10/01/2018] [Accepted: 11/20/2018] [Indexed: 12/29/2022]
Affiliation(s)
- Konstantinos Katsoulis
- Pulmonary Department, 424 Army General Hospital, Periferiaki Odos, 56429, Efkarpia, Thessaloniki, Greece
| | - Georgios Ismailos
- Experimental-Research Center ELPEN, ELPEN Pharmaceuticals, Leoforos Marathonos 95, 19009, Pikermi, Attika, Greece
| | - Maria Kipourou
- Pulmonary Department, 424 Army General Hospital, Periferiaki Odos, 56429, Efkarpia, Thessaloniki, Greece.
| | - Konstantinos Kostikas
- 2nd Respiratory Medicine Department, University of Athens Medical School, Attikon Hospital, Athens, Greece
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12
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Bajantri B, Toolsie O, Venkatram S, Diaz-Fuentes G. Mycoplasma Pneumoniae Pneumonia: Walking Pneumonia Can Cripple the Susceptible. J Clin Med Res 2018; 10:891-897. [PMID: 30425761 PMCID: PMC6225856 DOI: 10.14740/jocmr3592w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 10/16/2018] [Indexed: 12/04/2022] Open
Abstract
Background Mycoplasma pneumoniae pneumonia (MPP), or “walking pneumonia,” is an atypical mild disease with varied clinical findings. Specifically, diagnosis is often controversial and understanding of disease presentation is limited. The goal of the study was to evaluate presentation, clinical associations and outcomes of MPP patients admitted to an inner-city hospital. Methods This was a retrospective analysis of adult patients diagnosed with MPP from January 2010 to January 2017. Primary outcomes were need for intensive care unit (ICU) care, ICU and hospital length of stay (LOS), presence of shock and need for mechanical ventilation (MV). Predictors of mortality were analyzed. Results Of the 203 patients analyzed, 16 (8%) died. Relative to survivors, non-survivors were older (65 ± 21 versus 53 ± 18, P = 0.009) and less frequently had obstructive airway disease (OAD; P = 0.003). Non-survivors also had significantly higher serum levels of lactic dehydrogenase (LDH), blood urea nitrogen (BUN), creatinine, transaminases and troponins. Finally, non-survivors more commonly exhibited shock, need for MV and bilateral lung infiltrates. There were no group differences in patient comorbidities, symptoms, antibiotic use or LOS. Predictors of mortality included age, OAD, low CD4+ T-cell counts in human immunodeficiency virus-infected patients and elevated serum levels of LDH, creatinine, BUN, leukocytes, transaminases and troponins. Conclusion Despite the availability of appropriate antibiotics, MPP incurs significant mortality and morbidity. Our study indicated that the recommended treatment includes prompt serological diagnosis, aggressive supportive care and presumptive antibiotics, especially in patients with poor prognosis.
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Affiliation(s)
- Bharat Bajantri
- Division of Pulmonary and Critical Care Medicine, Bronx Care Health System, Bronx, NY 10457, USA
| | - Omesh Toolsie
- Division of Pulmonary and Critical Care Medicine, Bronx Care Health System, Bronx, NY 10457, USA
| | - Sindhaghatta Venkatram
- Division of Pulmonary and Critical Care Medicine, Bronx Care Health System, Bronx, NY 10457, USA
| | - Gilda Diaz-Fuentes
- Division of Pulmonary and Critical Care Medicine, Bronx Care Health System, Bronx, NY 10457, USA
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13
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Kumar S. Mycoplasma pneumoniae: A significant but underrated pathogen in paediatric community-acquired lower respiratory tract infections. Indian J Med Res 2018; 147:23-31. [PMID: 29749357 PMCID: PMC5967212 DOI: 10.4103/ijmr.ijmr_1582_16] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Lower respiratory tract infections are considered a common cause responsible for morbidity and mortality among children, and Mycoplasma pneumoniae is identified to be responsible for up to 40 per cent of community-acquired pneumonia in children greater than five years of age. Extrapulmonary manifestations have been reported either due to spread of infection or autoimmune mechanisms. Infection by M. pneumoniae has high incidence and clinical importance but is still an underrated disease. Most widely used serologic methods are enzyme immunoassays for detection of immunoglobulin M (IgM), IgG and IgA antibodies to M. pneumoniae, though other methods such as particle agglutination assays and immunofluorescence methods are also used. Detection of M. pneumoniae by nucleic acid amplification techniques provides fast, sensitive and specific results. Utilization of polymerase chain reaction (PCR) has improved the diagnosis of M. pneumoniae infections. Besides PCR, other alternative amplification techniques include (i) nucleic acid sequence-based amplification, (ii) Qβ replicase amplification, (iii) strand displacement amplification, (iv) transcription-mediated amplification, and (v) ligase chain reaction. Macrolides are used as the first-line treatment in childhood for M. pneumoniae infections; however, emergence of macrolide-resistant M. pneumoniae is a cause of concern. Development of a safe vaccine is important that gives protective immunity and would be a major step in reducing M. pneumoniae infections.
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Affiliation(s)
- Surinder Kumar
- Department of Microbiology, Maulana Azad Medical College, New Delhi, India
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14
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Totten AH, Xiao L, Luo D, Briles D, Hale JY, Crabb DM, Schoeb TR, Alishlash AS, Waites KB, Atkinson TP. Allergic airway sensitization impairs antibacterial IgG antibody responses during bacterial respiratory tract infections. J Allergy Clin Immunol 2018; 143:1183-1197.e7. [PMID: 30092287 DOI: 10.1016/j.jaci.2018.07.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 06/02/2018] [Accepted: 07/24/2018] [Indexed: 11/17/2022]
Abstract
BACKGROUND Mycoplasma pneumoniae, an atypical human pathogen, has been associated with asthma initiation and exacerbation. Asthmatic patients have been reported to have higher carriage rates of M pneumoniae compared with nonasthmatic subjects and are at greater risk for invasive respiratory infections. OBJECTIVE We sought to study whether prior allergen sensitization affects the host response to chronic bacterial infection. METHODS BALB/cJ and IL-4 receptor α-/- mice were sensitized with ovalbumin (OVA) and then infected with M pneumoniae or Streptococcus pneumoniae. Immune parameters were analyzed at 30 days postinfection and included cellular profiles in bronchoalveolar lavage fluid (BALF) and serum IgG and IgE antibody levels to whole bacterial lysate, recombinant P1 adhesin, and OVA. Total lung RNA was examined for transcript levels, and BALF was examined for cytokine protein profiles. RESULTS Anti-M pneumoniae antibody responses were decreased in allergen-sensitized, M pneumoniae-infected animals compared with control animals, but OVA-specific IgG responses were unaffected. Similar decreases in anti-S pneumoniae antibody levels were found in OVA-sensitized animals. However, M pneumoniae, but not S pneumoniae, infection augmented anti-OVA IgE antibody responses. Loss of IL-4 receptor signaling partially restored anti-M pneumoniae antibody responses in IgG2a and IgG2b subclasses. Inflammatory cytokine levels in BALF from OVA-sensitized, M pneumoniae-infected or S pneumoniae-infected animals were reduced compared with those in uninfected OVA-sensitized control animals. Unexpectedly, airway hyperreactivity to methacholine was essentially ablated in M pneumoniae-infected, OVA-sensitized animals. CONCLUSIONS An established type 2-biased host immune response impairs the host immune response to respiratory bacterial infection in a largely pathogen-independent manner. Some pathogens, such as M pneumoniae, can augment ongoing allergic responses and inhibit pulmonary type 2 cytokine responses and allergic airway hyperreactivity.
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Affiliation(s)
- Arthur H Totten
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Ala
| | - Li Xiao
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Ala
| | - Danlin Luo
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Ala
| | - David Briles
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, Ala
| | - Joanetha Y Hale
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, Ala
| | - Donna M Crabb
- Department of Pathology, Diagnostic Mycoplasma Laboratory, University of Alabama at Birmingham, Birmingham, Ala
| | - Trenton R Schoeb
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Ala
| | | | - Ken B Waites
- Department of Pathology, Diagnostic Mycoplasma Laboratory, University of Alabama at Birmingham, Birmingham, Ala
| | - T Prescott Atkinson
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Ala.
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15
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Nordengrün M, Michalik S, Völker U, Bröker BM, Gómez-Gascón L. The quest for bacterial allergens. Int J Med Microbiol 2018; 308:738-750. [DOI: 10.1016/j.ijmm.2018.04.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 04/11/2018] [Accepted: 04/12/2018] [Indexed: 12/24/2022] Open
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16
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Bajantri B, Venkatram S, Diaz-Fuentes G. Mycoplasma pneumoniae: A Potentially Severe Infection. J Clin Med Res 2018; 10:535-544. [PMID: 29904437 PMCID: PMC5997415 DOI: 10.14740/jocmr3421w] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 04/09/2018] [Indexed: 01/07/2023] Open
Abstract
Mycoplasma pneumoniae infections remain one of the most common etiologies of community-acquired pneumonia (CAP). The clinical presentation and manifestations vary widely and can affect all organs of the body. Diagnosis is challenging because there are no constant findings in physical exams or laboratory or radiological assessments that indicate Mycoplasma pneumoniae pneumonia, and specific diagnostic tools are not readily available. Extrapulmonary manifestations and severe pulmonary manifestations can lead to long-term sequelae. The increasing emergence of Mycoplasma pneumoniae that is resistant to macrolides in some areas of the world and increased world travel could add to the difficulty of controlling and treating Mycoplasma pneumoniae infections. We present a concise and up-to-date review of the current knowledge of Mycoplasma pneumoniae pneumonia.
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Affiliation(s)
- Bharat Bajantri
- Division of Pulmonary Critical Care, Department of Medicine, Bronx Care Health System, Bronx, NY 10457, USA
| | - Sindhaghatta Venkatram
- Division of Pulmonary Critical Care, Department of Medicine, Bronx Care Health System, Bronx, NY 10457, USA
| | - Gilda Diaz-Fuentes
- Division of Pulmonary Critical Care, Department of Medicine, Bronx Care Health System, Bronx, NY 10457, USA
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17
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Maselli DJ, Medina JL, Brooks EG, Coalson JJ, Kannan TR, Winter VT, Principe M, Cagle MP, Baseman JB, Dube PH, Peters JI. The Immunopathologic Effects of Mycoplasma pneumoniae and Community-acquired Respiratory Distress Syndrome Toxin. A Primate Model. Am J Respir Cell Mol Biol 2018; 58:253-260. [PMID: 28915064 PMCID: PMC5805996 DOI: 10.1165/rcmb.2017-0006oc] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Accepted: 07/31/2017] [Indexed: 01/30/2023] Open
Abstract
Mycoplasma pneumoniae infection has been linked to poor asthma outcomes. M. pneumoniae produces an ADP-ribosylating and vacuolating toxin called community-acquired respiratory distress syndrome (CARDS) toxin that has a major role in inflammation and airway dysfunction. The objective was to evaluate the immunopathological effects in primates exposed to M. pneumoniae or CARDS toxin. A total of 13 baboons were exposed to M. pneumoniae or CARDS toxin. At Days 7 and 14, BAL fluid was collected and analyzed for cell count, percent of each type of cell, CARDS toxin by PCR, CARDS toxin by antigen capture, eosinophilic cationic protein, and cytokine profiles. Serum IgM, IgG, and IgE responses to CARDS toxin were measured. All animals had a necropsy for analysis of the histopathological changes on lungs. No animal developed signs of infection. The serological responses to CARDS toxin were variable. At Day 14, four of seven animals exposed to M. pneumoniae and all four animals exposed to CARDS toxin developed histological "asthma-like" changes. T cell intracellular cytokine analysis revealed an increasing ratio of IL-4/IFN-γ over time. Both M. pneumoniae and CARDS toxin exposure resulted in similar histopathological pulmonary changes, suggesting that CARDS toxin plays a major role in the inflammatory response.
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Affiliation(s)
- Diego J. Maselli
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine
| | - Jorge L. Medina
- Department of Microbiology and Immunology
- Center for Airway Inflammation Research
| | - Edward G. Brooks
- Center for Airway Inflammation Research
- Division of Immunology and Infectious Diseases, Department of Pediatrics, and
| | - Jacqueline J. Coalson
- Department of Pathology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Thirumalai R. Kannan
- Department of Microbiology and Immunology
- Center for Airway Inflammation Research
| | - Vicki T. Winter
- Department of Pathology, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Molly Principe
- Division of Immunology and Infectious Diseases, Department of Pediatrics, and
| | - Marianna P. Cagle
- Department of Microbiology and Immunology
- Center for Airway Inflammation Research
| | - Joel B. Baseman
- Department of Microbiology and Immunology
- Center for Airway Inflammation Research
| | - Peter H. Dube
- Department of Microbiology and Immunology
- Center for Airway Inflammation Research
| | - Jay I. Peters
- Division of Pulmonary Diseases and Critical Care Medicine, Department of Medicine
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18
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Ramasamy K, Balasubramanian S, Manickam K, Pandranki L, Taylor AB, Hart PJ, Baseman JB, Kannan TR. Mycoplasma pneumoniae Community-Acquired Respiratory Distress Syndrome Toxin Uses a Novel KELED Sequence for Retrograde Transport and Subsequent Cytotoxicity. mBio 2018; 9:e01663-17. [PMID: 29362229 PMCID: PMC5784248 DOI: 10.1128/mbio.01663-17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 12/01/2017] [Indexed: 12/21/2022] Open
Abstract
Mycoplasma pneumoniae is an atypical bacterium that causes respiratory illnesses in humans, including pharyngitis, tracheobronchitis, and community-acquired pneumonia (CAP). It has also been directly linked to reactive airway disease, asthma, and extrapulmonary pathologies. During its colonization, M. pneumoniae expresses a unique ADP-ribosylating and vacuolating cytotoxin designated community-acquired respiratory distress syndrome (CARDS) toxin. CARDS toxin persists and localizes in the airway in CAP patients, asthmatics, and trauma patients with ventilator-associated pneumonia. Although CARDS toxin binds to specific cellular receptors, is internalized, and induces hyperinflammation, histopathology, mucus hyperplasia, and other airway injury, the intracellular trafficking of CARDS toxin remains unclear. Here, we show that CARDS toxin translocates through early and late endosomes and the Golgi complex and concentrates at the perinuclear region to reach the endoplasmic reticulum (ER). Using ER-targeted SNAP-tag, we confirmed the association of CARDS toxin with the ER and determined that CARDS toxin follows the retrograde pathway. In addition, we identified a novel CARDS toxin amino acid fingerprint, KELED, that is required for toxin transport to the ER and subsequent toxin-mediated cytotoxicity.IMPORTANCEMycoplasma pneumoniae, a leading cause of bacterial community-acquired pneumonia (CAP) among children and adults in the United States, synthesizes a 591-amino-acid ADP-ribosylating and vacuolating protein, designated community-acquired respiratory distress syndrome (CARDS) toxin. CARDS toxin alone is sufficient to induce and mimic major inflammatory and histopathological phenotypes associated with M. pneumoniae infection in rodents and primates. In order to elicit its ADP-ribosylating and vacuolating activities, CARDS toxin must bind to host cell receptors, be internalized via clathrin-mediated pathways, and subsequently be transported to specific intracellular organelles. Here, we demonstrate how CARDS toxin utilizes its unique KELED sequence to exploit the retrograde pathway machinery to reach the endoplasmic reticulum (ER) and fulfill its cytopathic potential. The knowledge generated from these studies may provide important clues to understand the mode of action of CARDS toxin and develop interventions that reduce or eliminate M. pneumoniae-associated airway and extrapulmonary pathologies.
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Affiliation(s)
- Kumaraguruparan Ramasamy
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Sowmya Balasubramanian
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Krishnan Manickam
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Lavanya Pandranki
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Alexander B Taylor
- X-Ray Crystallography Core Laboratory, Institutional Research Cores and Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - P John Hart
- X-Ray Crystallography Core Laboratory, Institutional Research Cores and Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
- Department of Veterans Affairs, South Texas Veterans Health Care System, San Antonio, Texas, USA
| | - Joel B Baseman
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - T R Kannan
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
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19
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NLRP3 Is a Critical Regulator of Inflammation and Innate Immune Cell Response during Mycoplasma pneumoniae Infection. Infect Immun 2017; 86:IAI.00548-17. [PMID: 29061706 DOI: 10.1128/iai.00548-17] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 10/16/2017] [Indexed: 12/18/2022] Open
Abstract
Mycoplasma pneumoniae is an atypical bacterial respiratory pathogen known to cause a range of airway inflammation and lung and extrapulmonary pathologies. We recently reported that an M. pneumoniae-derived ADP-ribosylating and vacuolating toxin called community-acquired respiratory distress syndrome (CARDS) toxin is capable of triggering NLRP3 (NLR-family, leucine-rich repeat protein 3) inflammasome activation and interleukin-1β (IL-1β) secretion in macrophages. However, it is unclear whether the NLRP3 inflammasome is important for the immune response during M. pneumoniae acute infection. In the current study, we utilized in vitro and in vivo models of M. pneumoniae infection to characterize the role of the NLRP3 inflammasome during acute infection. M. pneumoniae-infected macrophages deficient for inflammasome components NLRP3, ASC (apoptosis speck-like protein containing a caspase activation and recruitment domain), or caspase-1 failed to process and secrete IL-1β. The MyD88/NF-κB signaling pathway was found to be critical for proinflammatory gene expression in macrophages infected with M. pneumoniae C57BL/6 mice deficient for NLRP3 expression were unable to produce IL-1β in the airways during acute infection, and lack of this inflammatory response led to deficient immune cell activation and delayed bacterial clearance. These findings are the first to report the importance of the NLRP3 inflammasome in regulating the inflammatory response and influencing the progression of M. pneumoniae during acute infection.
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20
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Waites KB, Xiao L, Liu Y, Balish MF, Atkinson TP. Mycoplasma pneumoniae from the Respiratory Tract and Beyond. Clin Microbiol Rev 2017; 30:747-809. [PMID: 28539503 PMCID: PMC5475226 DOI: 10.1128/cmr.00114-16] [Citation(s) in RCA: 350] [Impact Index Per Article: 50.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Mycoplasma pneumoniae is an important cause of respiratory tract infections in children as well as adults that can range in severity from mild to life-threatening. Over the past several years there has been much new information published concerning infections caused by this organism. New molecular-based tests for M. pneumoniae detection are now commercially available in the United States, and advances in molecular typing systems have enhanced understanding of the epidemiology of infections. More strains have had their entire genome sequences published, providing additional insights into pathogenic mechanisms. Clinically significant acquired macrolide resistance has emerged worldwide and is now complicating treatment. In vitro susceptibility testing methods have been standardized, and several new drugs that may be effective against this organism are undergoing development. This review focuses on the many new developments that have occurred over the past several years that enhance our understanding of this microbe, which is among the smallest bacterial pathogens but one of great clinical importance.
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Affiliation(s)
- Ken B Waites
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Li Xiao
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Yang Liu
- Institute of Antibiotics, Huashan Hospital, Fudan University, Shanghai, China, and Key Laboratory of Clinical Pharmacology of Antibiotics, Ministry of Health, Shanghai, China
| | | | - T Prescott Atkinson
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
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21
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Wood PR, Kampschmidt JC, Dube PH, Cagle MP, Chaparro P, Ketchum NS, Kannan TR, Singh H, Peters JI, Baseman JB, Brooks EG. Mycoplasma pneumoniae and health outcomes in children with asthma. Ann Allergy Asthma Immunol 2017. [PMID: 28634021 DOI: 10.1016/j.anai.2017.05.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Acute infections with Mycoplasma pneumoniae (Mp) have been associated with worsening asthma in children. Mp can be present in the respiratory tract for extended periods; it is unknown whether the long-term persistence of Mp in the respiratory tract affects long-term asthma control. OBJECTIVE To determine the effect of Mp on asthma control. METHODS We enrolled 31 pediatric subjects 3 to 10 years of age with persistent asthma who completed up to 8 visits over a 24-month period. We detected Mp by antigen capture and polymerase chain reaction. Primary outcome measurements included symptom scores, quality of life, medication scores, oral corticosteroid use, health care usage, school absences, and exhaled breath condensate pH. RESULTS Low levels of Mp community-acquired respiratory distress syndrome toxin were detected in 20 subjects (64.5%) at enrollment. Subjects with Mp positivity at a given visit had a .579 probability of remaining Mp positive at the subsequent visit, whereas those with Mp negativity had a .348 probability of becoming Mp positive at the following visit. The incidence of Mp overall was higher in the spring and summer months. Overall, we found no significant relation between the detection of Mp and worse outcome measurements at the same visit or at subsequent visits. CONCLUSION The long-term persistence of Mp in the respiratory tract is common in children with asthma. However, the detection of Mp was not associated significantly with worse asthma symptoms, quality of life, health care usage, school absences, or exhaled breath condensate pH in this pediatric asthma cohort.
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Affiliation(s)
- Pamela R Wood
- Department of Pediatrics, UT Health San Antonio, San Antonio, Texas.
| | | | - Peter H Dube
- Department of Microbiology, Immunology and Molecular Genetics, UT Health San Antonio, San Antonio, Texas
| | - Marianna P Cagle
- Department of Microbiology, Immunology and Molecular Genetics, UT Health San Antonio, San Antonio, Texas
| | - Paola Chaparro
- Department of Microbiology, Immunology and Molecular Genetics, UT Health San Antonio, San Antonio, Texas
| | - Norma S Ketchum
- Department of Epidemiology and Biostatistics, UT Health San Antonio, San Antonio, Texas
| | - Thirumalai R Kannan
- Department of Microbiology, Immunology and Molecular Genetics, UT Health San Antonio, San Antonio, Texas
| | - Harjinder Singh
- Department of Medicine, UT Health San Antonio, San Antonio, Texas
| | - Jay I Peters
- Department of Medicine, UT Health San Antonio, San Antonio, Texas
| | - Joel B Baseman
- Department of Microbiology, Immunology and Molecular Genetics, UT Health San Antonio, San Antonio, Texas
| | - Edward G Brooks
- Department of Pediatrics, UT Health San Antonio, San Antonio, Texas
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22
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Otsuka N, Gotoh K, Nishimura N, Ozaki T, Nakamura Y, Haga K, Yamazaki M, Gondaira F, Okada K, Miyaji Y, Toyoizumi-Ajisaka H, Shibayama K, Arakawa Y, Kamachi K. A Novel IgM-capture enzyme-linked immunosorbent assay using recombinant Vag8 fusion protein for the accurate and early diagnosis of Bordetella pertussis infection. Microbiol Immunol 2017; 60:326-33. [PMID: 26996337 DOI: 10.1111/1348-0421.12378] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/11/2016] [Accepted: 03/16/2016] [Indexed: 12/25/2022]
Abstract
An ELISA that measures anti-PT IgG antibody has been used widely for the serodiagnosis of pertussis; however, the IgG-based ELISA is inadequate for patients during the acute phase of the disease because of the slow response of anti-PT IgG antibodies. To solve this problem, we developed a novel IgM-capture ELISA that measures serum anti-Bordetella pertussis Vag8 IgM levels for the accurate and early diagnosis of pertussis. First, we confirmed that Vag8 was highly expressed in all B. pertussis isolates tested (n = 30), but little or none in other Bordetella species, and that DTaP vaccines did not induce anti-Vag8 IgG antibodies in mice (i.e. the antibody level could be unaffected by the vaccination). To determine the immune response to Vag8 in B. pertussis infection, anti-Vag8 IgM levels were compared between 38 patients (acute phase of pertussis) and 29 healthy individuals using the anti-Vag8 IgM-capture ELISA. The results revealed that the anti-Vag8 IgM levels were significantly higher in the patients compared with the healthy individuals (P < 0.001). ROC analysis also showed that the anti-Vag8 IgM-capture ELISA has higher diagnostic accuracy (AUC, 0.92) than a commercial anti-PT IgG ELISA kit. Moreover, it was shown that anti-Vag8 IgM antibodies were induced earlier than anti-PT IgG antibodies on sequential patients' sera. These data indicate that our novel anti-Vag8 IgM-capture ELISA is a potentially useful tool for making the accurate and early diagnosis of B. pertussis infection.
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Affiliation(s)
- Nao Otsuka
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo
| | - Kensei Gotoh
- Department of Pediatrics, Konan Kosei Hospital, Konan
| | | | - Takao Ozaki
- Department of Pediatrics, Konan Kosei Hospital, Konan
| | - Yukitsugu Nakamura
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo.,Department of Pediatrics, St. Marianna University School of Medicine, Kawasaki
| | | | | | | | - Kenji Okada
- Section of Pediatrics, Department of Medicine, Division of Oral & Medical Management, Fukuoka Dental College, Fukuoka
| | - Yusuke Miyaji
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo.,Department of Pediatrics, St. Marianna University School of Medicine, Kawasaki
| | | | - Keigo Shibayama
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo
| | - Yoshichika Arakawa
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo.,Department of Bacteriology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazunari Kamachi
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo
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23
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Medina JL, Brooks EG, Chaparro A, Dube PH. Mycoplasma pneumoniae CARDS toxin elicits a functional IgE response in Balb/c mice. PLoS One 2017; 12:e0172447. [PMID: 28199385 PMCID: PMC5310781 DOI: 10.1371/journal.pone.0172447] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 02/04/2017] [Indexed: 12/24/2022] Open
Abstract
Mycoplasma pneumoniae is strongly associated with new onset asthma and asthma exacerbations. Until recently, the molecular mechanisms utilized by M. pneumoniae to influence asthma symptoms were unknown. However, we recently reported that an ADP-ribosylating and vacuolating toxin called the Community Acquired Respiratory Distress Syndrome toxin, CARDS toxin, produced by M. pneumoniae was sufficient to promote allergic inflammation and asthma-like disease in mice. A mouse model of CARDS toxin exposure was used to evaluate total and CARDS-toxin specific serum IgE responses. Mast cell sensitization, challenge, and degranulation studies determined functionality of the CARDS toxin-specific IgE. In the current study, we report that a single mucosal exposure to CARDS toxin was sufficient to increase total serum IgE and CARDS toxin-specific IgE in mice. Mice given a second mucosal challenge of CARDS toxin responded with significant increases in total and CARDS toxin-specific IgE. CARDS toxin-specific IgE bound to an N-terminal peptide of CARDS toxin but not the C-terminal peptide. Likewise, full-length CARDS toxin and the N-terminal peptide induced mast cell degranulation. Altogether, these data demonstrate that exposure to CARDS toxin is sufficient to generate functional IgE in mice. M. pneumoniae and CARDS toxin are strongly associated with asthma exacerbations raising the possibility that the CARDS toxin-specific IgE-mast cell axis contributes to disease pathogenesis.
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Affiliation(s)
- Jorge L. Medina
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Edward G. Brooks
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
- Department of Pediatrics, Division of Immunology and Infectious Diseases, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Adriana Chaparro
- Department of Pediatrics, Division of Immunology and Infectious Diseases, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Peter H. Dube
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
- * E-mail:
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24
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Abstract
Chronic bacterial infection is implicated in both the development and severity of asthma. The atypical bacteria Mycoplasma pneumoniae and Chlamydophila pneumoniae have been identified in the airways of asthmatics and correlated with clinical features such as adult onset, exacerbation risks, steroid sensitivity, and symptom control. Asthmatic patients with evidence of bacterial infection may benefit from antibiotic treatment directed towards these atypical organisms. Examination of the airway microbiome may identify microbial communities that confer risk for or protection from severe asthma.
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Yeh JJ, Wang YC, Hsu WH, Kao CH. Incident asthma and Mycoplasma pneumoniae: A nationwide cohort study. J Allergy Clin Immunol 2015; 137:1017-1023.e6. [PMID: 26586037 DOI: 10.1016/j.jaci.2015.09.032] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 07/16/2015] [Accepted: 09/08/2015] [Indexed: 01/30/2023]
Abstract
BACKGROUND Previous studies investigating the relationship between Mycoplasma pneumoniae and incident asthma in the general population have been inconclusive. OBJECTIVE We conducted a nationwide cohort study to clarify this relationship. METHODS Using the National Health Insurance Research Database of Taiwan, we identified 1591 patients with M pneumoniae infection (International Classification of Diseases, Ninth Revision, Clinical Modification code 4830) given diagnoses between 2000 and 2008. We then frequency matched 6364 patients without M pneumoniae infection from the general population according to age, sex, and index year. Cox proportional hazards regression analysis was performed to determine the adjusted hazard ratio (aHR) of the occurrence of asthma in the M pneumoniae cohort compared with that in the non-M pneumoniae cohort. RESULTS Regardless of comorbidities and the use of antibiotic or steroid therapies, patients with M pneumonia infection had a higher risk of incident asthma than those without it. The aHR of asthma was 3.35 (95% CI, 2.71-4.15) for the M pneumoniae cohort, with a significantly higher risk when patients were stratified by age, sex, follow-up time, and comorbidities, including allergic rhinitis, atopic dermatitis, or allergic conjunctivitis. Patients with M pneumoniae infection had a higher risk of having early-onset (age, <12 years; aHR, 2.87) and late-onset (age, ≥12 years; aHR, 3.95) asthma. The aHR was also higher within the less than 2-year follow-up in the M pneumoniae cohort (aHR, 4.41; 95% CI, 3.40-5.74) than in the cohort without the infection. CONCLUSION This study found that incident cases of early-onset and late-onset asthma are closely related to M pneumoniae infection, even in nonatopic patients.
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Affiliation(s)
- Jun-Jun Yeh
- Department of Chest Medicine and Family Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chiayi, Taiwan; Chia Nan University of Pharmacy and Science, Tainan, Taiwan; Meiho University, Pingtung, Taiwan
| | - Yu-Chiao Wang
- Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan; School of Medicine, China Medical University Hospital, Taichung, Taiwan
| | - Wu-Huei Hsu
- School of Medicine, China Medical University Hospital, Taichung, Taiwan
| | - Chia-Hung Kao
- Graduate Institute of Clinical Medical Science and School of Medicine, College of Medicine, China Medical University Hospital, Taichung, Taiwan; Department of Nuclear Medicine and PET Center, China Medical University Hospital, Taichung, Taiwan.
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Structure of CARDS toxin, a unique ADP-ribosylating and vacuolating cytotoxin from Mycoplasma pneumoniae. Proc Natl Acad Sci U S A 2015; 112:5165-70. [PMID: 25848012 DOI: 10.1073/pnas.1420308112] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mycoplasma pneumoniae (Mp) infections cause tracheobronchitis and "walking" pneumonia, and are linked to asthma and other reactive airway diseases. As part of the infectious process, the bacterium expresses a 591-aa virulence factor with both mono-ADP ribosyltransferase (mART) and vacuolating activities known as Community-Acquired Respiratory Distress Syndrome Toxin (CARDS TX). CARDS TX binds to human surfactant protein A and annexin A2 on airway epithelial cells and is internalized, leading to a range of pathogenetic events. Here we present the structure of CARDS TX, a triangular molecule in which N-terminal mART and C-terminal tandem β-trefoil domains associate to form an overall architecture distinct from other well-recognized ADP-ribosylating bacterial toxins. We demonstrate that CARDS TX binds phosphatidylcholine and sphingomyelin specifically over other membrane lipids, and that cell surface binding and internalization activities are housed within the C-terminal β-trefoil domain. The results enhance our understanding of Mp pathogenicity and suggest a novel avenue for the development of therapies to treat Mp-associated asthma and other acute and chronic airway diseases.
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Wang L, Chen Q, Shi C, Lv H, Xu X, Yu L. Changes of serum TNF-α, IL-5 and IgE levels in the patients of mycoplasma pneumonia infection with or without bronchial asthma. Int J Clin Exp Med 2015; 8:3901-3906. [PMID: 26064291 PMCID: PMC4443125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 02/25/2015] [Indexed: 06/04/2023]
Abstract
OBJECTIVE This study aimed to investigate the changes of serum levels of TNF-α, IL-5 and IgE in mycoplasma pneumonia (MP) infection patients with or without bronchial asthma and explore its clinical importance. METHODS ELISA and Western blot assay were performed to detect the serum levels of TNF-α, IL-5 and IgE in 35 healthy subjects, 45 patients with MP infection and 40 bronchial asthma patients with MP infection. RESULTS The serum levels of TNF-α, IL-5 and IgE in MP infection patients and asthma patients with MP infection were significantly higher than those in healthy subjects (P<0.01). Moreover, the serum levels of TNF-α, IL-5 and IgE in asthma patients with MP infection was markedly higher than those in MP infection patients (P<0.05). Correlation analysis showed serum TNF-α was positively associated with serum IL-5 (r=0.9636, P<0.01), serum TNF-α positively related to IgE (r=0.9841, P<0.01) and serum IgE positively relevant with serum IL-5 (r=0.9572, P<0.01) in asthma patients with MP infection. CONCLUSION Our findings indicate that serum levels of TNF-α, IL-5 and IgE may play important roles in the pathogenesis of MP infection, especially in asthma patients.
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Affiliation(s)
- Lan Wang
- Department of Respiratory Medicine, Tongji Hospital, Tongji University School of Medicine Shanghai 200065, China
| | - Qiang Chen
- Department of Respiratory Medicine, Tongji Hospital, Tongji University School of Medicine Shanghai 200065, China
| | - Cuiqin Shi
- Department of Respiratory Medicine, Tongji Hospital, Tongji University School of Medicine Shanghai 200065, China
| | - Hanjing Lv
- Department of Respiratory Medicine, Tongji Hospital, Tongji University School of Medicine Shanghai 200065, China
| | - Xianghuai Xu
- Department of Respiratory Medicine, Tongji Hospital, Tongji University School of Medicine Shanghai 200065, China
| | - Li Yu
- Department of Respiratory Medicine, Tongji Hospital, Tongji University School of Medicine Shanghai 200065, China
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ADP-ribosylation of NLRP3 by Mycoplasma pneumoniae CARDS toxin regulates inflammasome activity. mBio 2014; 5:mBio.02186-14. [PMID: 25538194 PMCID: PMC4278538 DOI: 10.1128/mbio.02186-14] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The inflammasome is a major regulator of inflammation through its activation of procaspase-1, which cleaves prointerleukin-1β (pro-IL-1β) into its mature form. IL-1β is a critical proinflammatory cytokine that dictates the severity of inflammation associated with a wide spectrum of inflammatory diseases. NLRP3 is a key component of the inflammasome complex, and multiple signals and stimuli trigger formation of the NLRP3 inflammasome complex. In the current study, we uncovered a yet unknown mechanism of NLRP3 inflammasome activation by a pathogen-derived factor. We show that the unique bacterial ADP-ribosylating and vacuolating toxin produced by Mycoplasma pneumoniae and designated community-acquired respiratory distress syndrome (CARDS) toxin activates the NLRP3 inflammasome by colocalizing with the NLRP3 inflammasome and catalyzing the ADP-ribosylation of NLRP3. Mutant full-length CARDS toxin lacking ADP-ribosyltransferase (ADPRT) activity and truncated CARDS toxins unable to bind to macrophages and be internalized failed to activate the NLRP3 inflammasome. These studies demonstrate that CARDS toxin-mediated ADP-ribosylation constitutes an important posttranslational modification of NLRP3, that ADPRT activity of CARDS toxin is essential for NLRP3 inflammasome activation, and that posttranslational ADPRT-mediated modification of the inflammasome is a newly discovered mechanism for inflammasome activation with subsequent release of IL-1β and associated pathologies. Inflammation is a fundamental innate immune response to environmental factors, including infections. The inflammasome represents a multiprotein complex that regulates inflammation via its ability to activate specific proinflammatory cytokines, resulting in an effective host protective response. However, excessive release of proinflammatory cytokines can occur following infection that skews the host response to “hyperinflammation” with exaggerated tissue damage. Mycoplasma pneumoniae, a common bacterial airway pathogen, possesses a unique protein toxin with ADP-ribosyltransferase and vacuolating properties capable of reproducing the robust inflammation and cytopathology associated with mycoplasma infection. Here, we show that the toxin uniquely activates the NLRP3 inflammasome by colocalizing with and ADP-ribosylating NLRP3, possibly leading to “hyperinflammation” and thus uncovering a novel target for therapeutic intervention.
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Annexin A2 mediates Mycoplasma pneumoniae community-acquired respiratory distress syndrome toxin binding to eukaryotic cells. mBio 2014; 5:mBio.01497-14. [PMID: 25139904 PMCID: PMC4147866 DOI: 10.1128/mbio.01497-14] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Mycoplasma pneumoniae synthesizes a novel human surfactant protein A (SP-A)-binding cytotoxin, designated community-acquired respiratory distress syndrome (CARDS) toxin, that exhibits ADP-ribosylating and vacuolating activities in mammalian cells and is directly linked to a range of acute and chronic airway diseases, including asthma. In our attempt to detect additional CARDS toxin-binding proteins, we subjected the membrane fraction of human A549 airway cells to affinity chromatography using recombinant CARDS toxin as bait. A 36-kDa A549 cell membrane protein bound to CARDS toxin and was identified by time of flight (TOF) mass spectroscopy as annexin A2 (AnxA2) and verified by immunoblotting with anti-AnxA2 monoclonal antibody. Dose-dependent binding of CARDS toxin to recombinant AnxA2 reinforced the specificity of the interaction, and further studies revealed that the carboxy terminus of CARDS toxin mediated binding to AnxA2. In addition, pretreatment of viable A549 cells with anti-AnxA2 monoclonal antibody or AnxA2 small interfering RNA (siRNA) reduced toxin binding and internalization. Immunofluorescence analysis of CARDS toxin-treated A549 cells demonstrated the colocalization of CARDS toxin with cell surface-associated AnxA2 upon initial binding and with intracellular AnxA2 following toxin internalization. HepG2 cells, which express low levels of AnxA2, were transfected with a plasmid expressing AnxA2 protein, resulting in enhanced binding of CARDS toxin and increased vacuolization. In addition, NCI-H441 cells, which express both AnxA2 and SP-A, upon AnxA2 siRNA transfection, showed decreased binding and subsequent vacuolization. These results indicate that CARDS toxin recognizes AnxA2 as a functional receptor, leading to CARDS toxin-induced changes in mammalian cells. Host cell susceptibility to bacterial toxins is usually determined by the presence and abundance of appropriate receptors, which provides a molecular basis for toxin target cell specificities. To perform its ADP-ribosylating and vacuolating activities, community-acquired respiratory distress syndrome (CARDS) toxin must bind to host cell surfaces via receptor-mediated events in order to be internalized and trafficked effectively. Earlier, we reported the binding of CARDS toxin to surfactant protein A (SP-A), and here we show how CARDS toxin uses an alternative receptor to execute its pathogenic properties. CARDS toxin binds selectively to annexin A2 (AnxA2), which exists both on the cell surface and intracellularly. Since AnxA2 regulates membrane dynamics at early stages of endocytosis and trafficking, it serves as a distinct receptor for CARDS toxin binding and internalization and enhances CARDS toxin-induced vacuolization in mammalian cells.
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Mycoplasma pneumoniae CARDS toxin exacerbates ovalbumin-induced asthma-like inflammation in BALB/c mice. PLoS One 2014; 9:e102613. [PMID: 25058417 PMCID: PMC4109942 DOI: 10.1371/journal.pone.0102613] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 06/20/2014] [Indexed: 01/21/2023] Open
Abstract
Mycoplasma pneumoniae causes a range of airway and extrapulmonary pathologies in humans. Clinically, M. pneumoniae is associated with acute exacerbations of human asthma and a worsening of experimentally induced asthma in mice. Recently, we demonstrated that Community Acquired Respiratory Distress Syndrome (CARDS) toxin, an ADP-ribosylating and vacuolating toxin synthesized by M. pneumoniae, is sufficient to induce an asthma-like disease in BALB/cJ mice. To test the potential of CARDS toxin to exacerbate preexisting asthma, we examined inflammatory responses to recombinant CARDS toxin in an ovalbumin (OVA) murine model of asthma. Differences in pulmonary inflammatory responses between treatment groups were analyzed by histology, cell differentials and changes in cytokine and chemokine concentrations. Additionally, assessments of airway hyperreactivity were evaluated through direct pulmonary function measurements. Analysis of histology revealed exaggerated cellular inflammation with a strong eosinophilic component in the CARDS toxin-treated group. Heightened T-helper type-2 inflammatory responses were evidenced by increased expression of IL-4, IL-13, CCL17 and CCL22 corresponding with increased airway hyperreactivity in the CARDS toxin-treated mice. These data demonstrate that CARDS toxin can be a causal factor in the worsening of experimental allergic asthma, highlighting the potential importance of CARDS toxin in the etiology and exacerbation of human asthma.
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Kannan TR, Krishnan M, Ramasamy K, Becker A, Pakhomova ON, Hart PJ, Baseman JB. Functional mapping of community-acquired respiratory distress syndrome (CARDS) toxin of Mycoplasma pneumoniae defines regions with ADP-ribosyltransferase, vacuolating and receptor-binding activities. Mol Microbiol 2014; 93:568-81. [PMID: 24948331 DOI: 10.1111/mmi.12680] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2014] [Indexed: 11/28/2022]
Abstract
Community-acquired respiratory distress syndrome (CARDS) toxin from Mycoplasma pneumoniae is a 591-amino-acid virulence factor with ADP-ribosyltransferase (ADPRT) and vacuolating activities. It is expressed at low levels during in vitro growth and at high levels during colonization of the lung. Exposure of experimental animals to purified recombinant CARDS toxin alone is sufficient to recapitulate the cytopathology and inflammatory responses associated with M. pneumoniae infection in humans and animals. Here, by molecular modelling, serial truncations and site-directed mutagenesis, we show that the N-terminal region is essential for ADP-ribosylating activity. Also, by systematic truncation and limited proteolysis experiments we identified a portion of the C-terminal region that mediates toxin binding to mammalian cell surfaces and subsequent internalization. In addition, the C-terminal region alone induces vacuolization in a manner similar to full-length toxin. Together, these data suggest that CARDS toxin has a unique architecture with functionally separable N-terminal and C-terminal domains.
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Affiliation(s)
- Thirumalai R Kannan
- Department of Microbiology and Immunology/Center for Airway Inflammation Research, The University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA
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Abstract
The pathogenetic mechanisms leading to asthma are likely to be diverse, influenced by multiple genetic polymorphisms as well as elements of the environment. Recent data on the microbiome of the airway have revealed intriguing differences between the number and diversity of microbial populations in healthy persons and asthmatics. There is convincing evidence that early viral infections, particularly with human rhinovirus and respiratory syncytial virus, are often associated with the development of chronic asthma and with exacerbations. Recent studies suggest that two unrelated types of atypical bacteria, Mycoplasma pneumoniae (Mpn) and Chlamydia pneumoniae, are present in the airways of a substantial proportion of the population, bringing up the possibility that the persistent presence of the organism may contribute to the asthmatic phenotype in a subset of patients. This review will examine the current data regarding a possible role for infection in chronic asthma with a particular focus on atypical bacterial infections.
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Affiliation(s)
- T Prescott Atkinson
- Children's of Alabama CPP M220, 1601 4th Ave South, Birmingham, AL, 35233, USA,
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Krishnan M, Kannan TR, Baseman JB. Mycoplasma pneumoniae CARDS toxin is internalized via clathrin-mediated endocytosis. PLoS One 2013; 8:e62706. [PMID: 23667510 PMCID: PMC3647021 DOI: 10.1371/journal.pone.0062706] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Accepted: 03/28/2013] [Indexed: 01/27/2023] Open
Abstract
Bacterial toxins possess specific mechanisms of binding and uptake by mammalian cells. Mycoplasma pneumoniae CARDS (Community Acquired Respiratory Distress Syndrome) toxin is a 68 kDa protein, which demonstrates high binding affinity to human surfactant protein-A and exhibits specific biological activities including mono-ADP ribosylation and vacuolization. These properties lead to inflammatory processes in the airway and a range of cytopathologies including ciliostasis, loss of tissue integrity and injury, and cell death. However, the process by which CARDS toxin enters target cells is unknown. In this study, we show that CARDS toxin binds to mammalian cell surfaces and is internalized rapidly in a dose and time-dependent manner using a clathrin-mediated pathway, as indicated by inhibition of toxin internalization by monodansylcadaverine but not by methyl-β-cyclodextrin or filipin. Furthermore, the internalization of CARDS toxin was markedly inhibited in clathrin-depleted cells.
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Affiliation(s)
- Manickam Krishnan
- Department of Microbiology and Immunology, The University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - T. R. Kannan
- Department of Microbiology and Immunology, The University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Joel B. Baseman
- Department of Microbiology and Immunology, The University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
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Wood PR, Hill VL, Burks ML, Peters JI, Singh H, Kannan TR, Vale S, Cagle MP, Principe MFR, Baseman JB, Brooks EG. Mycoplasma pneumoniae in children with acute and refractory asthma. Ann Allergy Asthma Immunol 2013; 110:328-334.e1. [PMID: 23622002 DOI: 10.1016/j.anai.2013.01.022] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Revised: 01/26/2013] [Accepted: 01/28/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND The presence of Mycoplasma pneumoniae has been associated with worsening asthma in children. Sensitive assays have been developed to detect M pneumoniae-derived community-acquired respiratory distress syndrome (CARDS) toxin. OBJECTIVES To identify the frequency and persistence of M pneumoniae detection in respiratory secretions of children with and without asthma and to evaluate antibody responses to M pneumoniae and the impact of M pneumoniae on biological markers, asthma control, and quality of life. METHODS We enrolled 143 pediatric patients (53 patients with acute asthma, 26 patients with refractory asthma, and 64 healthy controls; age range, 5-17 years) during a 20-month period with 2 to 5 follow-up visits. We detected M pneumoniae using CARDS toxin antigen capture and polymerase chain reaction and P1 adhesin polymerase chain reaction. Immune responses to M pneumoniae were determined by IgG and IgM levels directed against CARDS toxin and P1 adhesin. pH was measured in exhaled breath condensates, and asthma control and quality of life were assessed using the Asthma Control Test and Pediatric Asthma Quality of Life Questionnaire. RESULTS M pneumoniae was detected in 64% of patients with acute asthma, 65% with refractory asthma, and 56% of healthy controls. Children with asthma had lower antibody levels to M pneumoniae compared with healthy controls. Exhaled breath condensate pHs and asthma control and quality of life scores were lower in M pneumoniae-positive patients with asthma. CONCLUSION The results suggest that M pneumoniae detection is common in children, M pneumoniae detection is associated with worsening asthma, and children with asthma may have poor humoral immune responses to M pneumoniae.
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Affiliation(s)
- Pamela R Wood
- Department of Pediatrics, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229-3900, USA.
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Mathew J, Aronow WS, Chandy D. Therapeutic options for severe asthma. Arch Med Sci 2012; 8:589-97. [PMID: 23056066 PMCID: PMC3460493 DOI: 10.5114/aoms.2012.30280] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Revised: 03/22/2012] [Accepted: 03/22/2012] [Indexed: 11/17/2022] Open
Abstract
As the overall prevalence of asthma has escalated in the past decades, so has the population of patients with severe asthma. This condition is often difficult to manage due to the relative limitation of effective therapeutic options for the physician and the social and economic burden of the disease on the patient. Management should include an evaluation and elimination of modifiable risk factors such as smoking, allergen exposure, obesity and non-adherence, as well as therapy for co-morbidities like gastro-esophageal reflux disease and obstructive sleep apnea. Current treatment options include conventional agents such as inhalational corticosteroids, long acting β(2) agonists, leukotriene antagonists, and oral corticosteroids. Less conventional treatment options include immunotherapy with methotrexate, cyclosporine and tacrolimus, biological drugs like monoclonal antibodies, tumor necrosis factor-α blockers and oligonucleotides, phosphodiesterase inhibitors, antimicrobials and bronchial thermoplasty.
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Affiliation(s)
- Jilcy Mathew
- Divisions of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York Medical College, Valhalla, USA
| | - Wilbert S. Aronow
- Divisions of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York Medical College, Valhalla, USA
- Cardiology Division, Department of Medicine, New York Medical College, Valhalla, USA
| | - Dipak Chandy
- Divisions of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York Medical College, Valhalla, USA
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Kennedy JL, Heymann PW, Platts-Mills TAE. The role of allergy in severe asthma. Clin Exp Allergy 2012; 42:659-69. [PMID: 22515388 DOI: 10.1111/j.1365-2222.2011.03944.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The classification of asthma to identify forms which have different contributing causes is useful for all cases in which the disease requires regular treatment, but it is essential for the management of severe asthma. Many forms of the disease can occur, and complex mixtures are not uncommon; here we artificially separated the cases into four groups: (i) inhalant allergy, (ii) fungal sensitization with or without colonization (including ABPA); (iii) severe sinusitis with or without aspirin-exacerbated respiratory disease (AERD), and (iv) non-inflammatory cases, including those associated with severe obesity and vocal cord dysfunction (VCD). The reason for focusing on these groups is because they illustrate how much the specific management depends upon correct classification. Inhalant allergy can present as chronically severe asthma. However, severe attacks of asthma requiring hospital admission can occur in cases which are generally only mild or moderate. The best recognized and probably the most common cause of these acute episodes is acute infection with a rhinovirus. Recent evidence suggests that high titre IgE, particularly to dust mite, correlates to exacerbations of asthma related to rhinovirus infection. Although it is well recognized that the fungus Aspergillus can colonize the lungs and cause severe disease, it is less well recognized that those cases may not have full criteria for diagnosis of ABPA or may involve other fungi. Identifying fungal cases is important, because treatment with imidazole antifungals can provide significant benefit. Taken together, specific treatment using allergen avoidance, immunotherapy, anti-IgE, or antifungal treatment is an important part of the successful management of severe asthma, and each of these requires correctly identifying specific sensitization.
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Affiliation(s)
- J L Kennedy
- University of Virginia Asthma and Allergic Diseases Center, Charlottesville, VA, USA
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Hahn DL, Schure A, Patel K, Childs T, Drizik E, Webley W. Chlamydia pneumoniae-specific IgE is prevalent in asthma and is associated with disease severity. PLoS One 2012; 7:e35945. [PMID: 22545149 PMCID: PMC3335830 DOI: 10.1371/journal.pone.0035945] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 03/24/2012] [Indexed: 12/24/2022] Open
Abstract
Background Several Chlamydia pneumoniae (Cp) biomarkers have been associated with asthma but Cp-specific IgE (Cp IgE) has not been investigated extensively. Our objective was to investigate Cp IgE in community adult asthma patients. Methods (1) Prevalence of Cp IgE (measured by immunoblotting) and Cp DNA (by polymerase chain reaction) in peripheral blood, and biomarker associations with asthma severity. (2) Case-control studies of Cp IgE association with asthma using healthy blood donor (study 1) and non-asthmatic clinic patient (study 2) controls. Results Of 66 asthma subjects (mean age 40.9 years, range 5–75, 59% male, 45% ever-smokers) 33 (50%) were Cp IgE positive and 16 (24%) were Cp DNA positive (P = 0.001 for association of Cp IgE and DNA). Cp IgE was detected in 21% of mild intermittent asthma v 79% of severe persistent asthma (test for trend over severity categories, P = 0.002). Cp IgE detection was significantly (P = 0.001) associated with asthma when compared to healthy blood donor controls but not when compared to clinic controls. Conclusions Half of this sample of community asthma patients had detectable IgE against C. pneumoniae. Cp IgE was strongly and positively associated with asthma severity and with asthma when healthy blood donor controls were used. These results support the inclusion of Cp IgE as a biomarker in future studies of infectious contributions to asthma pathogenesis.
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Affiliation(s)
- David L. Hahn
- Departments of Family Medicine, University of Wisconsin School of Medicine and Public Health, and Dean Clinic, Madison, Wisconsin, United States of America
| | - Allison Schure
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, United States of America
| | - Katir Patel
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, United States of America
| | - Tawanna Childs
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, United States of America
| | - Eduard Drizik
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, United States of America
| | - Wilmore Webley
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, United States of America
- * E-mail:
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Medford ARL. Macrolides in asthma. Chest 2012; 141:569-570. [PMID: 22315126 DOI: 10.1378/chest.11-2364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- Andrew R L Medford
- North Bristol Lung Centre, Southmead Hospital, Westbury-on-Trym, Bristol, England.
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40
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Peters JI, Brooks EG, Singh H. Macrolides in Asthma: Response. Chest 2012. [DOI: 10.1378/chest.11-2909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Medina JL, Coalson JJ, Brooks EG, Winter VT, Chaparro A, Principe MFR, Kannan TR, Baseman JB, Dube PH. Mycoplasma pneumoniae CARDS toxin induces pulmonary eosinophilic and lymphocytic inflammation. Am J Respir Cell Mol Biol 2012; 46:815-22. [PMID: 22281984 DOI: 10.1165/rcmb.2011-0135oc] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Mycoplasma pneumoniae causes acute and chronic lung infections in humans, leading to a variety of pulmonary and extrapulmonary sequelae. Of the airway complications of M. pneumoniae infection, M. pneumoniae-associated exacerbation of asthma and pediatric wheezing are emerging as significant sources of human morbidity. However, M. pneumoniae products capable of promoting allergic inflammation are unknown. Recently, we reported that M. pneumoniae produces an ADP-ribosylating and vacuolating toxin termed the community-acquired respiratory distress syndrome (CARDS) toxin. Here we report that naive mice exposed to a single dose of recombinant CARDS (rCARDS) toxin respond with a robust inflammatory response consistent with allergic disease. rCARDS toxin induced 30-fold increased expression of the Th-2 cytokines IL-4 and IL-13 and 70- to 80-fold increased expression of the Th-2 chemokines CCL17 and CCL22, corresponding to a mixed cellular inflammatory response comprised of a robust eosinophilia, accumulation of T cells and B cells, and mucus metaplasia. The inflammatory responses correlate temporally with toxin-dependent increases in airway hyperreactivity characterized by increases in airway restriction and decreases in lung compliance. Furthermore, CARDS toxin-mediated changes in lung function and histopathology are dependent on CD4(+) T cells. Altogether, the data suggest that rCARDS toxin is capable of inducing allergic-type inflammation in naive animals and may represent a causal factor in M. pneumoniae-associated asthma.
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Affiliation(s)
- Jorge L Medina
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
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Kannan TR, Hardy RD, Coalson JJ, Cavuoti DC, Siegel JD, Cagle M, Musatovova O, Herrera C, Baseman JB. Fatal outcomes in family transmission of Mycoplasma pneumoniae. Clin Infect Dis 2011; 54:225-31. [PMID: 22052890 DOI: 10.1093/cid/cir769] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Mycoplasma pneumoniae continues to be a significant cause of community-acquired pneumonia and, on rare occasions, manifests as fulminant disease that leads to mortality, even in healthy individuals. METHODS We conducted a retrospective study on members of a family who were quarantined by the Centers for Disease Control and Prevention in 2002 for respiratory failure and death of a 15-year-old brother (sibling 1) and a 13-year-old sister (sibling 2). Collected airway, cerebrospinal fluid (CSF), and serum samples from both deceased siblings and serum samples from both parents and the remaining 3 ill siblings (sibling 3-5) were tested using a range of diagnostic assays. Autopsy lung tissue samples from sibling 2 were also assessed using immunohistochemical and immunoelectron microscopic methods. RESULTS Autopsy evaluation of sibling 1 revealed cerebral edema consistent with hypoxic ischemic encepatholopathy and pulmonary findings of bronchiolitis obliterans with organizing pneumonia (BOOP). Postmortem lung examination of sibling 2 revealed lymphoplasmacytic bronchiolitis with intraluminal purulent exudate, BOOP, and pulmonary edema. Results of diagnostic assays implicated the household transmission of M. pneumoniae among all 5 siblings and both parents. Further analysis of lung tissue from sibling 2 demonstrated the presence of M. pneumoniae organisms and community-acquired respiratory distress syndrome toxin. M. pneumoniae was cultured directly from sibling 2 autopsy lung tissue. CONCLUSION Evidence is provided that M. pneumoniae was readily transmitted to all members of the household and that the resulting infections led to a spectrum of individual responses with variation in disease progression, including lymphoplasmacytic bronchiolitis, BOOP, and death.
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Affiliation(s)
- T R Kannan
- Department of Microbiology and Immunology, The University of Texas Health Science Center at San Antonio, TX 78229-3900, USA
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Kannan TR, Coalson JJ, Cagle M, Musatovova O, Hardy RD, Baseman JB. Synthesis and distribution of CARDS toxin during Mycoplasma pneumoniae infection in a murine model. J Infect Dis 2011; 204:1596-604. [PMID: 21957154 DOI: 10.1093/infdis/jir557] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Mice were infected with Mycoplasma pneumoniae and monitored for the synthesis and distribution of the unique adenosine diphosphate-ribosylating and vacuolating Community Acquired Respiratory Distress Syndrome (CARDS) toxin in bronchiolar lavage fluid (BALF) and lung. We noted direct relationships between the concentration of CARDS toxin and numbers of mycoplasma genomes in BALF and the degree of histologic pulmonary inflammation. Immunostaining of lungs revealed extensive colonization by mycoplasmas, including the detection of CARDS toxin in the corresponding inflamed airways. Lung lesion scores were higher during the early stages of infection, decreased gradually by day 14 postinfection, and reached substantially lower values at day 35. Infected mouse immunoglobulin (Ig) M and IgG titers were positive for CARDS toxin as well as for the major adhesin P1 of M. pneumoniae. These data reinforce the proposed pathogenic role of CARDS toxin in M. pneumoniae-mediated pathologies.
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Affiliation(s)
- T R Kannan
- Department of Microbiology and Immunology, University of Texas Health Sciences Center at San Antonio, TX, USA
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