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Liu T, Zhang Y, Zhao H, Wu Q, Xin J, Pan Q. Mycoplasma hyopneumoniae inhibits the unfolded protein response to prevent host macrophage apoptosis and M2 polarization. Infect Immun 2024:e0005124. [PMID: 39133018 DOI: 10.1128/iai.00051-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Accepted: 07/10/2024] [Indexed: 08/13/2024] Open
Abstract
Enzootic pneumonia caused by Mycoplasma hyopneumoniae (M. hyopneumoniae) has inflicted substantial economic losses on the global pig industry. The progression of M. hyopneumoniae induced-pneumonia is associated with lung immune cell infiltration and extensive proinflammatory cytokine secretion. Our previous study established that M. hyopneumoniae disrupts the host unfolded protein response (UPR), a process vital for the survival and immune function of macrophages. In this study, we demonstrated that M. hyopneumoniae targets the UPR- and caspase-12-mediated endoplasmic reticulum (ER)-associated classical intrinsic apoptotic pathway to interfere with host cell apoptosis signaling, thereby preserving the survival of host tracheal epithelial cells (PTECs) and alveolar macrophages (PAMs) during the early stages of infection. Even in the presence of apoptosis inducers, host cells infected with M. hyopneumoniae exhibited an anti-apoptotic potential. Further analyses revealed that M. hyopneumoniae suppresses the three UPR branches and their induced apoptosis. Interestingly, while UPR activation typically drives host macrophages toward an M2 polarization phenotype, M. hyopneumoniae specifically obstructs this process to maintain a proinflammatory phenotype in the host macrophages. Overall, our findings propose that M. hyopneumoniae inhibits the host UPR to sustain macrophage survival and a proinflammatory phenotype, which may be implicated in its pathogenesis in inducing host pneumonia.
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Affiliation(s)
- Tong Liu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yujuan Zhang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Huanjun Zhao
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qi Wu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Jiuqing Xin
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Qiao Pan
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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2
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Zhang D, Ding J, Yu X, Li J, Chen K, Fu Y, Ding Z, Xu X. Effect of co-infection with Newcastle disease virus on Mycoplasma gallisepticum pathogenesis in vivo and in vitro. Vet Microbiol 2024; 295:110126. [PMID: 38896939 DOI: 10.1016/j.vetmic.2024.110126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 05/14/2024] [Accepted: 05/18/2024] [Indexed: 06/21/2024]
Abstract
The co-infection of Newcastle disease virus (NDV) and Mycoplasma gallisepticum (MG) has a detrimental effect on chicken production performance, exerts a deleterious impact on poultry production performance, resulting in substantial economic losses. However, the exact impact and underlying mechanisms remain ambiguous. In this study, co-infection models were established both in vivo and in vitro. Through these models, it was found that the co-infection facilitated the replication of MG and NDV, as well as MG induced pathogenesis. The administration of lentogenic NDV resulted in the suppression of the innate immune response in vivo. At cellular level, co-infection promoted MG induced apoptosis through caspase-dependent mitochondrial endogenous pathway and suppressed the inflammatory secretion. This research contributes novel insights in co-infection.
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Affiliation(s)
- Di Zhang
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China
| | - Jiaxin Ding
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China
| | - Xibing Yu
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China
| | - Jindou Li
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China
| | - Kainan Chen
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China
| | - Yongheng Fu
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China
| | - Zhuang Ding
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China.
| | - Xiaohong Xu
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130062, China.
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Wood GE, Bradshaw CS, Manhart LE. Update in Epidemiology and Management of Mycoplasma genitalium Infections. Infect Dis Clin North Am 2023; 37:311-333. [PMID: 37105645 DOI: 10.1016/j.idc.2023.02.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Mycoplasma genitalium is a frequent cause of urogenital syndromes in men and women and is associated with adverse sequelae in women. M genitalium also infects the rectum, and may cause proctitis, but rarely infects the pharynx. Diagnosis requires nucleic acid amplification testing. Antibiotic resistance is widespread: more than half of infections are resistant to macrolides and fluoroquinolone resistance is increasing. Resistance-guided therapy is recommended for symptomatic patients, involving initial treatment with doxycycline to reduce organism load followed by azithromycin for macrolide-sensitive infections or moxifloxacin for macrolide-resistant infections. Neither screening nor tests of cure are recommended in asymptomatic persons.
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Affiliation(s)
- Gwendolyn E Wood
- Division of Infectious Diseases, University of Washington, Center for AIDS and STD, Box 359779, 325 9th Avenue, Seattle, WA 98104, USA.
| | - Catriona S Bradshaw
- Melbourne Sexual Health Centre, Alfred Health, Melbourne, VIC, Australia; Central Clinical School, Nursing and Health Sciences, Monash University, Melbourne, VIC, Australia
| | - Lisa E Manhart
- Department of Epidemiology, University of Washington, Center for AIDS and STD, Box 359931, 325 9th Avenue, Seattle, WA 98104, USA
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Mycoplasma and Chlamydia Infection Can Increase Risk of Endometrial Cancer by Pro-inflammatory Cytokine Enlargement. INDIAN JOURNAL OF GYNECOLOGIC ONCOLOGY 2021. [DOI: 10.1007/s40944-020-00477-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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5
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Santos Junior MN, de Macêdo Neres NS, Campos GB, Bastos BL, Timenetsky J, Marques LM. A Review of Ureaplasma diversum: A Representative of the Mollicute Class Associated With Reproductive and Respiratory Disorders in Cattle. Front Vet Sci 2021; 8:572171. [PMID: 33681318 PMCID: PMC7930009 DOI: 10.3389/fvets.2021.572171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 01/13/2021] [Indexed: 12/22/2022] Open
Abstract
The Mollicutes class encompasses wall-less microbes with a reduced genome. They may infect plants, insects, humans, and animals including those on farms and in livestock. Ureaplasma diversum is a mollicute associated with decreased reproduction mainly in the conception rate in cattle, as well as weight loss and decreased quality in milk production. Therefore, U. diversum infection contributes to important economic losses, mainly in large cattle-producing countries such as the United States, China, Brazil, and India. The characteristics of Mollicutes, virulence, and pathogenic variations make it difficult to control their infections. Genomic analysis, prevalence studies, and immunomodulation assays help better understand the pathogenesis of bovine ureaplasma. Here we present the main features of transmission, virulence, immune response, and pathogenesis of U. diversum in bovines.
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Affiliation(s)
- Manoel Neres Santos Junior
- Department of Biointeraction, Multidisciplinary Institute of Health, Universidade Federal da Bahia, Vitória da Conquista, Brazil
- Department of Microbiology, State University of Santa Cruz (UESC), Ilhéus, Brazil
| | - Nayara Silva de Macêdo Neres
- Department of Biointeraction, Multidisciplinary Institute of Health, Universidade Federal da Bahia, Vitória da Conquista, Brazil
| | - Guilherme Barreto Campos
- Department of Biointeraction, Multidisciplinary Institute of Health, Universidade Federal da Bahia, Vitória da Conquista, Brazil
| | - Bruno Lopes Bastos
- Department of Biointeraction, Multidisciplinary Institute of Health, Universidade Federal da Bahia, Vitória da Conquista, Brazil
| | - Jorge Timenetsky
- Department of Microbiology, Institute of Biomedical Science, University of São Paulo, São Paulo, Brazil
| | - Lucas Miranda Marques
- Department of Biointeraction, Multidisciplinary Institute of Health, Universidade Federal da Bahia, Vitória da Conquista, Brazil
- Department of Microbiology, State University of Santa Cruz (UESC), Ilhéus, Brazil
- Department of Microbiology, Institute of Biomedical Science, University of São Paulo, São Paulo, Brazil
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A protocol for rapid monocyte isolation and generation of singular human monocyte-derived dendritic cells. PLoS One 2020; 15:e0231132. [PMID: 32271804 PMCID: PMC7145147 DOI: 10.1371/journal.pone.0231132] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 03/17/2020] [Indexed: 01/01/2023] Open
Abstract
The monocyte-derived dendritic cells (moDCs) are a subset of dendritic cells widely used in immunological studies as a convenient and easy approach after isolation of mononuclear cells directly from peripheral blood mononuclear cells (PBMC). Both the purification and cell culture of monocytes impact on the differentiation of monocytes into moDCs. The methodology to isolate and differentiate monocytes into moDCs is still controversial. We aimed to compare three different protocols for monocyte isolation from PBMC: 1) Cold-aggregation; 2) Percoll gradient; and 3) Magnetic beads cell-enrichment. Additionally we also compared four different monocyte differentiation and culture techniques: 1) Cell culture media; 2) Serum sources; 3) required GM-CSF and IL-4 concentrations; 4) Cell culture systems. We used flow cytometry analysis of light scattering and/or expression of pan surface markers, such as CD3, CD14 and CD209 to determine isolation/differentiation degree. Purified PBMC followed by two steps of cold aggregation, yielded cell viability around 95% with poor monocyte enrichment (monocytes increase vs. lymphocytes reduction was not statistically significant, p>0.05). Conversely, monocyte isolation from PBMC with discontinuous Percoll gradient generated around 50% cell viability. Albeit, we observed a significant reduction (p≤0.05) of lymphocytes contaminants. The magnetic beads cell-enrichment yield cell viability higher than 95%, as high as a significant lymphocyte depletion (p≤0.005) when compared to all other techniques employed. The moDCs showed better differentiation based on increased CD209 expression, but lower CD14 levels, when cells were cultured in RPMI medium plus 500IU/mL of both GM-CSF and IL-4 in a semi-adherent fashion. Serum sources showed no influence on the culture performance. In conclusion, the magnetic beads cell-enrichment showed superior cell viability, indicating that this approach is a better choice to isolate monocytes, and moDCs cultured afterwards in appropriate medium, serum, cytokines and culture system might influence the monocytes differentiation into moDC.
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Zuo L, Sun H, Yu M, You X, Zeng Y, Wu Y. Mycoplasma genitaliumlipoproteins inhibit tumour necrosis factor α-induced apoptosis in HeLa cells. BIOTECHNOL BIOTEC EQ 2018. [DOI: 10.1080/13102818.2018.1523688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- Lingling Zuo
- Department of Transfusion Medicine, The Second Affiliated Hospital of University of South China, Hengyang, PR China
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, PR China
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, PR China
| | - Hedong Sun
- Department of Neurology, The Second Affiliated Hospital of University of South China, Hengyang, PR China
| | - Minjun Yu
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, PR China
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, PR China
| | - Xiaoxing You
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, PR China
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, PR China
| | - Yanhua Zeng
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, PR China
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, PR China
| | - Yimou Wu
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, PR China
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang, PR China
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Liu W, Zhou D, Yuan F, Liu Z, Duan Z, Yang K, Guo R, Li M, Li S, Fang L, Xiao S, Tian Y. Surface proteins mhp390 (P68) contributes to cilium adherence and mediates inflammation and apoptosis in Mycoplasma hyopneumoniae. Microb Pathog 2018; 126:92-100. [PMID: 30385395 DOI: 10.1016/j.micpath.2018.10.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/22/2018] [Accepted: 10/26/2018] [Indexed: 10/28/2022]
Abstract
Mycoplasma hyopneumoniae is the causative agent of porcine enzootic pneumonia (EP) and responsible for major economic losses in global swine industry. After colonization of the respiratory epithelium, M. hyopneumoniae elicits a general mucociliary clearance loss, prolonged inflammatory response, host immunosuppression and secondary infections. Until now, the pathogenesis of M. hyopneumoniae is not completely elucidated. This present study explores the pathogenicity of mhp390 (P68, a membrane-associated lipoprotein) by elucidating its multiple functions. Microtitrer plate adherence assay demonstrated that mhp390 is a new cilia adhesin that plays an important role in binding to swine tracheal cilia. Notably, mhp390 could induce significant apoptosis of lymphocytes and monocytes from peripheral blood mononuclear cells (PBMCs), as well as primary alveolar macrophages (PAMs), which might weaken the host immune response. In addition, mhp390 contributes to the production of proinflammatory cytokines, at least partially, via the release of IL-1β and TNF-α. To the best of our knowledge, this is the first report of the multiple functions of M. hyopneumoniae mhp390, which may supplement known virulence genes and further develop our understanding of the pathogenicity of M. hyopneumoniae.
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Affiliation(s)
- Wei Liu
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Danna Zhou
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Fangyan Yuan
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Zewen Liu
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Zhengyin Duan
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Keli Yang
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Rui Guo
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China
| | - Mao Li
- Division of Animal Infectious Diseases, State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Sha Li
- Division of Animal Infectious Diseases, State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Liurong Fang
- Division of Animal Infectious Diseases, State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Shaobo Xiao
- Division of Animal Infectious Diseases, State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
| | - Yongxiang Tian
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture), Institute of Animal Husbandry and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan, 430070, People's Republic of China.
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9
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Christodoulides A, Gupta N, Yacoubian V, Maithel N, Parker J, Kelesidis T. The Role of Lipoproteins in Mycoplasma-Mediated Immunomodulation. Front Microbiol 2018; 9:1682. [PMID: 30108558 PMCID: PMC6080569 DOI: 10.3389/fmicb.2018.01682] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 07/05/2018] [Indexed: 01/16/2023] Open
Abstract
Mycoplasma infections, such as walking pneumonia or pelvic inflammatory diseases, are a major threat to public health. Despite their relatively small physical and genomic size, mycoplasmas are known to elicit strong host immune responses, generally inflammatory, while also being able to evade the immune system. The mycoplasma membrane is composed of approximately two-thirds protein and one-third lipid and contains several lipoproteins that are known to regulate host immune responses. Herein, the immunomodulatory effects of mycoplasma lipoproteins are reviewed. A better understanding of the immunomodulatory effects, both activating and evasive, of Mycoplasma surface lipoproteins will contribute to understanding mechanisms potentially relevant to mycoplasma disease vaccine development and treatment.
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Affiliation(s)
- Alexei Christodoulides
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Neha Gupta
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Vahe Yacoubian
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Neil Maithel
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Jordan Parker
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Theodoros Kelesidis
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
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10
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Li P, Xu J, Rao HM, Li X, Zhang YK, Jiang F, Wu WX. Mechanism of Apoptosis Induction by Mycoplasmal Nuclease MGA_0676 in Chicken Embryo Fibroblasts. Front Cell Infect Microbiol 2018; 8:105. [PMID: 29670864 PMCID: PMC5893762 DOI: 10.3389/fcimb.2018.00105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 03/19/2018] [Indexed: 12/22/2022] Open
Abstract
MGA_0676 has been characterized as a Mycoplasma gallisepticum nuclease that can induce apoptosis of chicken cells. However, the mechanism by which MGA_0676 induces apoptosis has remained unclear. In this study, we evaluated MGA_0676-induced apoptosis and internalization in immortalized chicken embryo fibroblasts (DF-1) and cancer cell lines. The internalization of MGA_0676 was proven through caveolin-mediated endocytosis by blocking the endocytosis with specific inhibitors or with siRNA. We identified the Thif domain of NEDD8-activating enzyme E1 regulatory subunit (NAE) in DF-1 as the target region interacting with the SNC domain of MGA_0676. The interaction between the Thif and SNC domains was observed co-located in the perinuclear and nuclear of DF-1. We found that the interaction between NAE and MGA_0676 increased the ability of apoptosis and accelerated the process of cullin neddylation in DF-1 cells, in turn activating NF-κB. This resulted in the observed aggregation of NF-κB in the nuclei of DF-1 cells. Moreover, the apoptosis induced by MGA_0676 decreased significantly when NF-κB was inhibited by siRNA or BAY 11-7082 or when NAE was silenced by siRNA. Overall, our results demonstrate that MGA_0676 is internalized through caveolin-mediated endocytosis, interacts with SNC-dependent Thif to accelerate the process of cullin neddylation and activates NF-κB in DF-1 cells, ultimately playing a key role in apoptosis in chicken cells. Our results indicate MGA_0676 constitutes a critical etiological virulence factor of the respiratory disease caused by M. gallisepticum. This study also opens a venue to investigate MGA_0676 as a potential candidate as pro-apoptotic drug in cancer studies.
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Affiliation(s)
- Peng Li
- Key Laboratory of Animal Epidemiology and Zoonosis, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Jian Xu
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agricultural and Forestry Sciences, Beijing, China
| | - Hong-Mei Rao
- Key Laboratory of Animal Epidemiology and Zoonosis, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Xia Li
- Key Laboratory of Animal Epidemiology and Zoonosis, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Yun-Ke Zhang
- Key Laboratory of Animal Epidemiology and Zoonosis, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Fei Jiang
- Veterinary Diagnostic Laboratory, China Animal Disease Control Center, Beijing, China
| | - Wen-Xue Wu
- Key Laboratory of Animal Epidemiology and Zoonosis, College of Veterinary Medicine, China Agricultural University, Beijing, China
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Capsular Polysaccharide is a Main Component of Mycoplasma ovipneumoniae in the Pathogen-Induced Toll-Like Receptor-Mediated Inflammatory Responses in Sheep Airway Epithelial Cells. Mediators Inflamm 2017; 2017:9891673. [PMID: 28553017 PMCID: PMC5434471 DOI: 10.1155/2017/9891673] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 03/27/2017] [Indexed: 12/12/2022] Open
Abstract
Mycoplasma ovipneumoniae (M. ovipneumoniae) is characterized as an etiological agent of primary atypical pneumonia that specifically infects sheep and goat. In an attempt to better understand the pathogen-host interaction between the invading M. ovipneumoniae and airway epithelial cells, we investigated the host inflammatory responses against capsular polysaccharide (designated as CPS) of M. ovipneumoniae using sheep bronchial epithelial cells cultured in an air-liquid interface (ALI) model. Results showed that CPS derived from M. ovipneumoniae could activate toll-like receptor- (TLR-) mediated inflammatory responses, along with an elevated expression of nuclear factor kappa B (NF-κB), activator protein-1 (AP-1), and interferon regulatory factor 3 (IRF3) as well as various inflammatory-associated mediators, representatively including proinflammatory cytokines, such as IL1β, TNFα, and IL8, and anti-inflammatory cytokines such as IL10 and TGFβ of TLR signaling cascade. Mechanistically, the CPS-induced inflammation was TLR initiated and was mediated by activations of both MyD88-dependent and MyD88-independent signaling pathways. Of importance, a blockage of CPS with specific antibody led a significant reduction of M. ovipneumoniae-induced inflammatory responses in sheep bronchial epithelial cells. These results suggested that CPS is a key virulent component of M. ovipneumoniae, which may play a crucial role in the inflammatory response induced by M. ovipneumoniae infections.
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12
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Xue D, Li Y, Jiang Z, Deng G, Li M, Liu X, Wang Y. A ROS-dependent and Caspase-3-mediated apoptosis in sheep bronchial epithelial cells in response to Mycoplasma Ovipneumoniae infections. Vet Immunol Immunopathol 2017; 187:55-63. [PMID: 28494930 DOI: 10.1016/j.vetimm.2017.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 02/18/2017] [Accepted: 04/11/2017] [Indexed: 10/19/2022]
Abstract
Mycoplasma Ovipneumoniae (M. ovipneumoniae) is a primary etiological agent of enzootic pneumonia in sheep and goats. It can enter and colonize ovine respiratory epithelial cells to establish an infection, which leads a serious cell death of epithelial cells. However, the nature of the interaction between pathogen of M. ovipneumoniae and host cells in the cell injury is currently not well understood. In this study, we investigated the epithelial cell apoptosis caused by an infection of M. ovipneumoniae in sheep primary air-liquid interface (ALI) epithelial cultures. The results showed that M. ovipneumoniae could specifically bind to ciliated cells at early stage of infection. Flow cytometric analysis demonstrated that an infection of M. ovipneumoniae induced a time-dependent cell apoptotic cell death, accompanied with an increased production of extracellular nitric oxide (NO), intracellular reactive oxygen species (ROS) production and activation of caspase-3 signaling in sheep bronchial epithelial cells. The induced cell apoptosis was further confirmed by a transferase-mediated deoxyuridine triphosphate-biotin nick end-labeling (TUNEL) assay. Interestingly, the M. ovipneumoniae-induced apoptosis and activation of caspase-3 were correlated with the production of ROS but not NO. Mechanistically, M. ovipneumoniae-induced cell apoptosis was mediated by a mechanism by increasing the expression of phosphorylation of p38 and pro-apoptotic proteins, and activating caspase-3, caspase-8 and poly ADP-ribose polymerase (PARP) cleavage. These results suggest a ROS-dependent and caspase-3-mediated cell apoptosis in sheep bronchial epithelial cells in response to M. ovipneumoniae infections.
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Affiliation(s)
- Di Xue
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China.
| | - Yanan Li
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China.
| | - Zhongjia Jiang
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China.
| | - Guangcun Deng
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China.
| | - Min Li
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China.
| | - Xiaoming Liu
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China; Ningxia Key Laboratory of Clinical and Pathogenic Microbiology, the General Hospital of Ningxia Medical University, Yinchuan, Ningxia, 750004, China.
| | - Yujiong Wang
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, China; College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China.
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Paes JA, Virginio VG, Cancela M, Leal FMA, Borges TJ, Jaeger N, Bonorino C, Schrank IS, Ferreira HB. Pro-apoptotic effect of a Mycoplasma hyopneumoniae putative type I signal peptidase on PK(15) swine cells. Vet Microbiol 2017; 201:170-176. [PMID: 28284605 DOI: 10.1016/j.vetmic.2017.01.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 12/08/2016] [Accepted: 01/18/2017] [Indexed: 10/20/2022]
Abstract
Mycoplasma hyopneumoniae is an economically significant swine pathogen that causes porcine enzootic pneumonia (PEP). Important processes for swine infection by M. hyopneumoniae depend on cell surface proteins, many of which are secreted by secretion pathways not completely elucidated so far. A putative type I signal peptidase (SPase I), a possible component of a putative Sec-dependent pathway, was annotated as a product of the sipS gene in the pathogenic M. hyopneumoniae 7448 genome. This M. hyopneumoniae putative SPase I (MhSPase I) displays only 14% and 23% of sequence identity/similarity to Escherichia coli bona fide SPase I, and, in complementation assays performed with a conditional E. coli SPase I mutant, only a partial restoration of growth was achieved with the heterologous expression of a recombinant MhSPase I (rMhSPase I). Considering the putative surface location of MhSPase I and its previously demonstrated capacity to induce a strong humoral response, we then assessed its potential to elicit a cellular and possible immunomodulatory response. In assays for immunogenicity assessment, rMhSPase I unexpectedly showed a cytotoxic effect on murine splenocytes. This cytotoxic effect was further confirmed using the swine epithelial PK(15) cell line in MTT and annexin V-flow cytometry assays, which showed that rMhSPase I induces apoptosis in a dose dependent-way. It was also demonstrated that this pro-apoptotic effect of rMhSPase I involves activation of a caspase-3 cascade. The potential relevance of the rMhSPase I pro-apoptotic effect for M. hyopneumoniae-host interactions in the context of PEP is discussed.
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Affiliation(s)
- Jéssica A Paes
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil
| | - Veridiana G Virginio
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil
| | - Martín Cancela
- Laboratório de Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil
| | - Fernanda M A Leal
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil
| | - Thiago J Borges
- Laboratório de Imunologia Celular, Instituto de Pesquisas Biomédicas, Pontifícia Universidade Católica do Rio Grande do Sul, Brazil
| | - Natália Jaeger
- Laboratório de Imunologia Celular, Instituto de Pesquisas Biomédicas, Pontifícia Universidade Católica do Rio Grande do Sul, Brazil
| | - Cristina Bonorino
- Laboratório de Imunologia Celular, Instituto de Pesquisas Biomédicas, Pontifícia Universidade Católica do Rio Grande do Sul, Brazil
| | - Irene S Schrank
- Laboratório de Microrganismos Diazotróficos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil
| | - Henrique B Ferreira
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Brazil.
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Refaat B, Ashshi AM, Batwa SA, Ahmad J, Idris S, Kutbi SY, Malibary FA, Kamfar FF. The prevalence of Chlamydia trachomatis and Mycoplasma genitalium tubal infections and their effects on the expression of IL-6 and leukaemia inhibitory factor in Fallopian tubes with and without an ectopic pregnancy. Innate Immun 2016; 22:534-45. [PMID: 27511901 DOI: 10.1177/1753425916662326] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 07/12/2016] [Indexed: 11/16/2022] Open
Abstract
This was a prospective case-control study that measured the prevalence of Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG) and Mycoplasma genitalium (MG) by an IVD CE multiplex PCR kit in fresh Fallopian tubes (FT) obtained from 96 ectopic pregnancies (EP) and 61 controls in the midluteal phase of the cycle. We later measured the expression profile of IL-6, leukaemia inhibitory factor (LIF) and their signalling molecules, in respect to the type and number of infections, by immunohistochemistry, ELISA and quantitative RT-PCR. The frequencies of CT, and MG mono- and co-infections were significantly higher in EP. IL-6, LIF, their receptors and intracellular mediators were significantly up-regulated at the gene and protein levels in positive compared with negative FTs within each group (P < 0.05). EP tubal samples with co-infections showed the highest significant expression of the candidate cytokines by all techniques (P < 0.05). CT and MG are frequent in EP and up-regulate the tubal expression of IL-6, LIF and their signalling molecules. Both cytokines could be involved in the tubal immune response against bacterial infections, as well as the pathogenesis of EP. Further studies are needed to explore the roles of IL-6 family in infection-induced tubal inflammation and EP.
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Affiliation(s)
- Bassem Refaat
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Al Abdeyah, Makkah, KSA
| | - Ahmed Mohamed Ashshi
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Al Abdeyah, Makkah, KSA
| | - Sarah Abdullah Batwa
- Obstertics and Gynaecology Department, Maternity and Children Hospital, Al-Aziziyah, Ministry of Health, Jeddah, KSA
| | - Jawwad Ahmad
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Al Abdeyah, Makkah, KSA
| | - Shakir Idris
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Al Abdeyah, Makkah, KSA
| | - Seham Yahia Kutbi
- Obstertics and Gynaecology Department, Maternity and Children Hospital, Al-Aziziyah, Ministry of Health, Jeddah, KSA
| | - Faizah Ahmed Malibary
- Obstertics and Gynaecology Department, Maternity and Children Hospital, Al-Aziziyah, Ministry of Health, Jeddah, KSA
| | - Fadi Fayez Kamfar
- Pathology Department, Clinical Laboratories, Maternity and Children Hospital, Ministry of Health, Makkah, KSA
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Recombinant Human Annexin A5 Can Repair the Disrupted Cardiomyocyte Adherens Junctions in Endotoxemia. Shock 2016; 44:83-9. [PMID: 25799159 DOI: 10.1097/shk.0000000000000370] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Recombinant human annexin A5 (Anx5) is known to protect cardiac function during endotoxemia, although the underlying mechanisms have yet to be elucidated. In this study, we demonstrated that Anx5 could repair the disrupted cardiomyocyte adherens junctions and improve the myocardial contractile function in lipopolysaccharide (LPS)-induced endotoxemia. Mechanistic studies revealed that Anx5 could antagonize the disassociation between p120-catenin (p120) and N-cadherin as well as the dephosphorylation of p120 in LPS-treated cardiomyocytes. Small interference RNA and specific inhibitors experiment demonstrated that Anx5 regulated p120 functions by inhibition of p21-activated kinase 5 in a protein kinase Cα-dependent way. Moreover, Anx5 could inhibit nuclear factor κB activation and downregulate the level of inflammatory cytokines, such as tumor necrosis factor α and interleukin 1β, which contributed to improving tissue pathological damage in LPS-induced mouse endotoxemia model. Taken together, Anx5 could protect cardiomyocytes adherens junctions and improve myocardial contractile function via regulation of p120 and anti-inflammation in LPS-induced endotoxemia. This study provided novel insights in the prevention and treatment of septic shock.
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Bai F, Ni B, Liu M, Feng Z, Xiong Q, Shao G. Mycoplasma hyopneumoniae-derived lipid-associated membrane proteins induce inflammation and apoptosis in porcine peripheral blood mononuclear cells in vitro. Vet Microbiol 2014; 175:58-67. [PMID: 25481242 DOI: 10.1016/j.vetmic.2014.11.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 10/16/2014] [Accepted: 11/07/2014] [Indexed: 01/07/2023]
Abstract
Mycoplasma hyopneumoniae is the causative agent of swine enzootic pneumonia (EP), a disease that causes considerable economic losss in swine industry. Lipid-associated membrane proteins (LAMPs) of mycoplasma play important roles in causing mycoplasma diseases. The present study explores the pathogenic mechanisms of M. hyopneumoniae LAMPs by elucidating their role in modulating the inflammation, apoptosis, and relevant signaling pathways of peripheral blood mononuclear cells (PBMCs) of pig. LAMP treatment inhibited the growth of PBMCs. Up-regulation of cytokines, such as IL-6 and IL-1β, as well as increased production of nitric oxide (NO) and superoxide anion were all detected in the supernatant of LAMPs-treated PBMCs. Furthermore, flow cytometric analysis using dual staining with annexin-V-FITC and propidium iodide (PI) showed that LAMPs of M. hyopneumoniae induced a time-dependent apoptosis in lymphocyts and monocytes from PBMCs, which was blocked by NOS inhibitor or antioxidant. In addition, LAMPs induced the phosphorylation of p38, the ratio of pro-apoptotic Bax protein to anti-apoptotic Bcl-2, activation of caspase-3 and caspase-8, and poly ADP-ribose polymerase (PARP) cleavage in PBMCs. These findings demonstrated that M. hyopneumoniae LAMPs induced the production of proinflammatory cytokines, NO and reactive oxygen species (ROS), and apoptosis of PBMCs in vitro through p38 MAPK and Bax/Bcl-2 signaling pathways, as well as caspase activation.
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Affiliation(s)
- Fangfang Bai
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Bo Ni
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Maojun Liu
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Zhixin Feng
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Qiyan Xiong
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Guoqing Shao
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China.
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Amorim AT, Marques LM, Santos AMOG, Martins HB, Barbosa MS, Rezende IS, Andrade EF, Campos GB, Lobão TN, Cortez BA, Monezi TA, Machado-Santelli GM, Timenetsky J. Apoptosis in HEp-2 cells infected with Ureaplasma diversum. Biol Res 2014; 47:38. [PMID: 25299837 PMCID: PMC4167145 DOI: 10.1186/0717-6287-47-38] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 08/22/2014] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Bacterial pathogens have many strategies for infecting and persisting in host cells. Adhesion, invasion and intracellular life are important features in the biology of mollicutes. The intracellular location of Ureaplasma diversum may trigger disturbances in the host cell. This includes activation or inhibition of pro and anti-apoptotic factors, which facilitate the development of host damage. The aim of the present study was to associate U. diversum infection in HEp-2 cells and apoptosis induction. Cells were infected for 72hs with four U. diversum clinical isolates and an ATCC strain. The U. diversum invasion was analyzed by Confocal Laser Scanning Microscopy and gentamicin invasion assay. The apoptosis was evaluated using pro-apoptotic and anti-apoptotic gene expression, and FITC Annexin V/Dead Cell Apoptosis Kit. RESULTS The number of internalized ureaplasma in HEp-2 cells increased significantly throughout the infection. The flow cytometry analysis with fluorochromes to detect membrane depolarization and gene expression for caspase 2, 3 and 9 increased in infected cells after 24 hours. However, after 72 hours a considerable decrease of apoptotic cells was observed. CONCLUSIONS The data suggests that apoptosis may be initially induced by some isolates in association with HEp-2 cells, but over time, there was no evidence of apoptosis in the presence of ureaplasma and HEp-2 cells. The initial increase and then decrease in apoptosis could be related to bacterial pathogen-associated molecular pattern (PAMPS). Moreover, the isolates of U. diversum presented differences in the studied parameters for apoptosis. It was also observed that the amount of microorganisms was not proportional to the induction of apoptosis in HEp-2 cells.
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Affiliation(s)
- Aline Teixeira Amorim
- Instituto Multidisciplinar em Saúde, Núcleo de Tecnologia em Saúde, Universidade Federal da Bahia, Vitória da Conquista, Brazil.
| | - Lucas Miranda Marques
- Instituto Multidisciplinar em Saúde, Núcleo de Tecnologia em Saúde, Universidade Federal da Bahia, Vitória da Conquista, Brazil. .,Instituto de Ciências Biomédicas, Departamento de Microbiologia, Universidade de São Paulo, São Paulo, Brazil.
| | | | - Hellen Braga Martins
- Instituto Multidisciplinar em Saúde, Núcleo de Tecnologia em Saúde, Universidade Federal da Bahia, Vitória da Conquista, Brazil.
| | - Maysa Santos Barbosa
- Instituto Multidisciplinar em Saúde, Núcleo de Tecnologia em Saúde, Universidade Federal da Bahia, Vitória da Conquista, Brazil.
| | - Izadora Souza Rezende
- Instituto Multidisciplinar em Saúde, Núcleo de Tecnologia em Saúde, Universidade Federal da Bahia, Vitória da Conquista, Brazil.
| | - Ewerton Ferraz Andrade
- Instituto Multidisciplinar em Saúde, Núcleo de Tecnologia em Saúde, Universidade Federal da Bahia, Vitória da Conquista, Brazil.
| | - Guilherme Barreto Campos
- Instituto de Ciências Biomédicas, Departamento de Microbiologia, Universidade de São Paulo, São Paulo, Brazil.
| | - Tássia Neves Lobão
- Instituto de Ciências Biomédicas, Departamento de Microbiologia, Universidade de São Paulo, São Paulo, Brazil.
| | - Beatriz Araujo Cortez
- Instituto de Ciências Biomédicas, Departamento de Biologia Celular e do Desenvolvimento, Universidade de São Paulo, São Paulo, Brazil.
| | - Telma Alvez Monezi
- Instituto de Ciências Biomédicas, Departamento de Microbiologia, Universidade de São Paulo, São Paulo, Brazil.
| | - Glaucia Maria Machado-Santelli
- Instituto de Ciências Biomédicas, Departamento de Biologia Celular e do Desenvolvimento, Universidade de São Paulo, São Paulo, Brazil.
| | - Jorge Timenetsky
- Instituto de Ciências Biomédicas, Departamento de Microbiologia, Universidade de São Paulo, São Paulo, Brazil.
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18
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Fu M, Chen LH, Xia G, Zhang Y. Effects of Ureaplasma urealyticum lipid-associated membrane proteins on rheumatoid arthritis synovial fibroblasts. J Int Med Res 2013; 41:1655-70. [PMID: 24097830 DOI: 10.1177/0300060513498542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objectives As an infectious agent might play a role in rheumatoid arthritis (RA) development, this study investigated effects of Ureaplasma urealyticum lipid-associated membrane proteins (UuLAMPs) on RA synovial fibroblast (RASF) proliferation, and tumour necrosis factor (TNF)-α and interleukin (IL)-1β production by THP-1 macrophages. Possible immunogenic proteins in UuLAMPs were identified. Methods RASFs were cultured from synovial tissue from donors with RA. Serum samples from donors with/without RA and with/without U. urealyticum infection were used for immunogenicity analyses. THP-1 macrophages served as a model for synovial macrophages. TNF-α and IL-1β mRNA levels were assessed using reverse transcription–polymerase chain reaction; protein levels were estimated using enzyme-linked immunosorbent assay. UuLAMPs underwent separation and Western blot analyses. Results UuLAMPs (0.025–0.4 µg/ml) stimulated RASF proliferation in a dose- and time-dependent manner, and increased TNF-α and IL-1β levels in THP-1 macrophages. Several immunogenic UuLAMPs were identified, but antibodies to a 25 kDa protein were only found in RA patients with U. urealyticum infection. Conclusions UuLAMPs might induce RASF proliferation and proinflammatory cytokine secretion in synovium from RA patients. A 25 kDa U. urealyticum protein might act as a cross-reactive antigen.
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Affiliation(s)
- Min Fu
- Department of Rheumatology, Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Li Hui Chen
- Department of Rheumatology, Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Guangtao Xia
- Department of Rheumatology, Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Yuanchao Zhang
- Department of Rheumatology, Provincial Hospital Affiliated to Shandong University, Jinan, China
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Bai F, Ni B, Liu M, Feng Z, Xiong Q, Xiao S, Shao G. Mycoplasma hyopneumoniae-derived lipid-associated membrane proteins induce apoptosis in porcine alveolar macrophage via increasing nitric oxide production, oxidative stress, and caspase-3 activation. Vet Immunol Immunopathol 2013; 155:155-61. [DOI: 10.1016/j.vetimm.2013.07.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 06/17/2013] [Accepted: 07/11/2013] [Indexed: 10/26/2022]
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Ma X, You X, Zeng Y, He J, Liu L, Deng Z, Jiang C, Wu H, Zhu C, Yu M, Wu Y. Mycoplasma fermentans MALP-2 induces heme oxygenase-1 expression via mitogen-activated protein kinases and Nrf2 pathways to modulate cyclooxygenase 2 expression in human monocytes. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2013; 20:827-34. [PMID: 23536693 PMCID: PMC3675981 DOI: 10.1128/cvi.00716-12] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 03/21/2013] [Indexed: 02/07/2023]
Abstract
Heme oxygenase-1 (HO-1) is a stress-inducible rate-limiting enzyme in heme degradation that confers cytoprotection against oxidative injury and performs a vital function in the maintenance of cell hemostasis. Increasing numbers of reports have indicated that mycoplasma-derived membrane lipoproteins/lipopeptides, such as macrophage-activating lipopeptide-2 (MALP-2), function as agents that stimulate the immune system by producing various inflammatory mediators, such as cytokines and cyclooxygenase 2 (COX-2), which play roles in the pathogenesis of inflammatory responses during mycoplasma infection. Here, we report that MALP-2 induced HO-1 mRNA and protein expression and upregulated HO-1 enzyme activity in THP-1 cells. Specific inhibitors of mitogen-activated protein kinases (MAPKs), SB203580, PD98059, and SP600125, significantly abolished HO-1 expression. In addition, MALP-2 also induced NF-E2-related factor 2 (Nrf2) translocation, and the silencing of Nrf2 expression in THP-1 cells decreased the levels of MALP-2-mediated HO-1 expression. Furthermore, COX-2 protein expression levels were upregulated in THP-1 cells in response to MALP-2, and transfection with small interfering RNAs of HO-1 significantly increased COX-2 accumulation. These results demonstrate that MALP-2 induces HO-1 expression via MAPKs and Nrf2 pathways and, furthermore, that MALP-2-induced COX-2 expression was modulated by HO-1 in THP-1 cells.
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Affiliation(s)
- Xiaohua Ma
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Xiaoxing You
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Yanhua Zeng
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Jun He
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory, The Affiliated Nanhua Hospital of University of South China, Hengyang, China
| | - Liangzhuan Liu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Zhongliang Deng
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Chuanhao Jiang
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Haiying Wu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Cuiming Zhu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Minjun Yu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
| | - Yimou Wu
- Institution of Pathogenic Biology, Medical College, University of South China, Hengyang, China
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Das K, De la Garza G, Maffi S, Saikolappan S, Dhandayuthapani S. Methionine sulfoxide reductase A (MsrA) deficient Mycoplasma genitalium shows decreased interactions with host cells. PLoS One 2012; 7:e36247. [PMID: 22558404 PMCID: PMC3340341 DOI: 10.1371/journal.pone.0036247] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 03/29/2012] [Indexed: 02/02/2023] Open
Abstract
Mycoplasma genitalium is an important sexually transmitted pathogen that affects both men and women. In genital-mucosal tissues, it initiates colonization of epithelial cells by attaching itself to host cells via several identified bacterial ligands and host cell surface receptors. We have previously shown that a mutant form of M. genitalium lacking methionine sulfoxide reductase A (MsrA), an antioxidant enzyme which converts oxidized methionine (Met(O)) into methionine (Met), shows decreased viability in infected animals. To gain more insights into the mechanisms by which MsrA controls M. genitalium virulence, we compared the wild-type M. genitalium strain (G37) with an msrA mutant (MS5) strain for their ability to interact with target cervical epithelial cell lines (HeLa and C33A) and THP-1 monocytic cells. Infection of epithelial cell lines with both strains revealed that MS5 was less cytotoxic to HeLa and C33A cell lines than the G37 strain. Also, the MS5 strain was more susceptible to phagocytosis by THP-1 cells than wild type strain (G37). Further, MS5 was less able to induce aggregation and differentiation in THP-1 cells than the wild type strain, as determined by carboxyfluorescein diacetate succinimidyl ester (CFSE) labeling of the cells, followed by counting of cells attached to the culture dish using image analysis. Finally, MS5 was observed to induce less proinflammatory cytokine TNF-α by THP-1 cells than wild type G37 strain. These results indicate that MsrA affects the virulence properties of M. genitalium by modulating its interaction with host cells.
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Affiliation(s)
- Kishore Das
- Regional Academic Health Center, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
| | - Georgina De la Garza
- Regional Academic Health Center, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
| | - Shivani Maffi
- Regional Academic Health Center, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
- Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
| | - Sankaralingam Saikolappan
- Regional Academic Health Center, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
| | - Subramanian Dhandayuthapani
- Regional Academic Health Center, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, Edinburg, Texas, United States of America
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22
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Rockel C, Hartung T. Systematic review of membrane components of gram-positive bacteria responsible as pyrogens for inducing human monocyte/macrophage cytokine release. Front Pharmacol 2012; 3:56. [PMID: 22529809 PMCID: PMC3328207 DOI: 10.3389/fphar.2012.00056] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 03/17/2012] [Indexed: 01/01/2023] Open
Abstract
Fifty years after the elucidation of lipopolysaccharides (LPS, endotoxin) as the principal structure of Gram-negative bacteria activating the human immune system, its Gram-positive counterpart is still under debate. Pyrogen tests based on the human monocyte activation have been validated for LPS detection as an alternative to the rabbit test and, increasingly, the limulus amebocyte lysate test. For full replacement, international validations with non-endotoxin pyrogens are in preparation. Following evidence-based medicine approaches, a systematic review of existing evidence as to the structural nature of the Gram-positive pyrogen was undertaken. For the three major constituents suggested, i.e., peptidoglycan, lipoteichoic acids (LTA), and bacterial lipoproteins (LP), the questions to be answered and a search strategy for relevant literature was developed, starting in MedLine. The evaluation was based on the Koch–Dale criteria for a mediator of an effect. A total of 380 articles for peptidoglycan, 391 for LP, and 285 for LTA were retrieved of which 12, 8, and 24, respectively, fulfilled inclusion criteria. The compiled data suggest that for peptidoglycan two Koch–Dale criteria are fulfilled, four for LTA, and two for bacterial LP. In conclusion, based on the best currently available evidence, LTA is the only substance that fulfills all criteria. LTA has been isolated from a large number of bacteria, results in cytokine release patterns inducible also with synthetic LTA. Reduction in bacterial cytokine induction with an inhibitor for LTA was shown. However, this systematic review cannot exclude the possibility that other stimulatory compounds complement or substitute for LTA in being the counterpart to LPS in some Gram-positive bacteria.
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Affiliation(s)
- Christoph Rockel
- Biochemical Pharmacology, University of Konstanz Konstanz, Germany
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Martínez-Gutierrez F, Thi EP, Silverman JM, de Oliveira CC, Svensson SL, Hoek AV, Sánchez EM, Reiner NE, Gaynor EC, Pryzdial EL, Conway EM, Orrantia E, Ruiz F, Av-Gay Y, Bach H. Antibacterial activity, inflammatory response, coagulation and cytotoxicity effects of silver nanoparticles. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2012; 8:328-36. [DOI: 10.1016/j.nano.2011.06.014] [Citation(s) in RCA: 213] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Revised: 05/19/2011] [Accepted: 06/18/2011] [Indexed: 11/28/2022]
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Abstract
OBJECTIVE Mycoplasma genitalium is an emerging sexually transmitted infection (STI) and has been associated with reproductive tract infections and HIV in cross-sectional studies. In this longitudinal study, we assess whether M. genitalium is associated with risk of acquiring HIV-1 infection. DESIGN Nested case-control study within a large prospective study in Zimbabwe and Uganda METHODS A total of 190 women who seroconverted to HIV-1 during follow-up (cases) were matched with up to two HIV-negative controls. Mycoplasma genitalium testing was performed by PCR-ELISA, using archived cervical samples from the HIV-1 detection visit and the last HIV-negative visit for cases, and equivalent visits in follow-up time for controls. Risk factors for HIV-1 acquisition were analyzed using conditional logistic regression, with M. genitalium as the primary exposure. RESULTS Mycoplasma genitalium was a common infection in these populations (14.8 and 6.5% prevalence among cases and controls, respectively, at the visit prior to HIV-1 detection), and more prevalent than other nonviral STIs. We found a greater than two-fold independent increased risk of HIV-1 acquisition among women infected with M. genitalium at the visit prior to HIV-1 acquisition [adjusted odds ratio (AOR) = 2.42; 95% confidence interval (CI) 1.01-5.80), and at time of HIV-1 acquisition (AOR = 2.18; 95% CI 0.98-4.85). An estimated 8.7% (95% CI 0.1-12.2%) of incident HIV-1 infections were attributable to M. genitalium. CONCLUSION This is the first longitudinal study to assess the relationship between M. genitalium and HIV-1 acquisition. If findings from this research are confirmed, M. genitalium screening and treatment among women at high risk for HIV-1 infection may be warranted as part of an HIV-1 prevention strategy.
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Dusanic D, Bencina D, Oven I, Cizelj I, Bencina M, Narat M. Mycoplasma synoviae induces upregulation of apoptotic genes, secretion of nitric oxide and appearance of an apoptotic phenotype in infected chicken chondrocytes. Vet Res 2012; 43:7. [PMID: 22280251 PMCID: PMC3293721 DOI: 10.1186/1297-9716-43-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Accepted: 01/26/2012] [Indexed: 11/29/2022] Open
Abstract
The role of chondrocytes in the development of infectious arthritis is not well understood. Several examples of mycoplasma-induced arthritis in animals indicate that chondrocytes come into direct contact with bacteria. The objective of this study was to analyze the interaction of an arthrogenic Mycoplasma synoviae strain WVU 1853 with chicken chondrocytes. We found that M. synoviae significantly reduces chondrocyte respiration. This was accompanied by alterations in chondrocyte morphology, namely cell shrinkage and cytoplasm condensation, as well as nuclear condensation and formation of plasma membrane invaginations containing nuclear material, which appeared to cleave off the cell surface. In concordance with these apoptosis-like events in chondrocytes, transcription was increased in several pro-apoptotic genes. Twenty-four hours after infection, strong upregulation was assayed in NOS2, Mapk11, CASP8 and Casp3 genes. Twenty-four and 72 h incubation of chondrocytes with M. synoviae induced upregulation of AIFM1, NFκB1, htrA3 and BCL2. Casp3 and NOS2 remained upregulated, but upregulation ceased for Mapk11 and CASP8 genes. Increased production of nitric oxide was also confirmed in cell supernates. The data suggests that chicken chondrocytes infected with M. synoviae die by apoptosis involving production of nitric oxide, caspase 3 activation and mitochondrial inactivation. The results of this study show for the first time that mycoplasmas could cause chondrocyte apoptosis. This could contribute to tissue destruction and influence the development of arthritic conditions. Hence, the study gives new insights into the role of mycoplasma infection on chondrocyte biology and development of infectious arthritis in chickens and potentially in humans.
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Affiliation(s)
- Daliborka Dusanic
- University of Ljubljana, Department of Animal Science, Chair for Genetics, Animal Biotechnology and Immunology, Groblje 3, 1230 Domzale, Slovenia
| | - Dusan Bencina
- University of Ljubljana, Department of Animal Science, Chair for Genetics, Animal Biotechnology and Immunology, Groblje 3, 1230 Domzale, Slovenia
| | - Irena Oven
- University of Ljubljana, Department of Animal Science, Chair for Genetics, Animal Biotechnology and Immunology, Groblje 3, 1230 Domzale, Slovenia
| | - Ivanka Cizelj
- University of Ljubljana, Department of Animal Science, Chair for Genetics, Animal Biotechnology and Immunology, Groblje 3, 1230 Domzale, Slovenia
| | - Mojca Bencina
- National Institute of Chemistry Slovenia, L12 Laboratory of Biotechnology, Hajdrihova 19, 1001 Ljubljana, Slovenia
| | - Mojca Narat
- University of Ljubljana, Department of Animal Science, Chair for Genetics, Animal Biotechnology and Immunology, Groblje 3, 1230 Domzale, Slovenia
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Identification of lipoprotein MslA as a neoteric virulence factor of Mycoplasma gallisepticum. Infect Immun 2010; 78:3475-83. [PMID: 20515935 DOI: 10.1128/iai.00154-10] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Many lipoproteins are expressed on the surfaces of mycoplasmas, and some have been implicated as playing roles in pathogenesis. Family 2 lipoproteins of Mycoplasma pneumoniae have a conserved "mycoplasma lipoprotein X" central domain and a "mycoplasma lipoprotein 10" C-terminal domain and are differentially expressed in response to environmental conditions. Homologues of family 2 lipoproteins are Mycoplasma specific and include the lipoprotein of Mycoplasma gallisepticum, encoded by the MGA0674 gene. Comparative transcriptomic analysis of the M. gallisepticum live attenuated vaccine strain F and the virulent strain R(low), reported in this study, indicated that MGA0674 is one of several differentially expressed genes. The MGA0674-encoded lipoprotein is a proteolytically processed, immunogenic, TX-114 detergent-phase protein which appears to have antigenic divergence between field strains R(low) and S6. We examined the virulence of an R(low) Delta MGA0674 mutant (P1H9) in vivo and observed reduced recovery and attenuated virulence in the tracheas of experimentally infected chickens. The virulence of two additional R(low) Delta MGA0674 mutants, 2162 and 2204, was assessed in a second in vivo virulence experiment. These mutants exhibited partial to complete attenuation in vivo, but recovery was observed more frequently. Since only Mycoplasma species harbor homologues of MGA0674, the gene product has been renamed "Mycoplasma-specific lipoprotein A" (MslA). Collectively, these data indicate that MslA is an immunogenic lipoprotein exhibiting reduced expression in an attenuated strain and plays a role in M. gallisepticum virulence.
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McGowin CL, Popov VL, Pyles RB. Intracellular Mycoplasma genitalium infection of human vaginal and cervical epithelial cells elicits distinct patterns of inflammatory cytokine secretion and provides a possible survival niche against macrophage-mediated killing. BMC Microbiol 2009; 9:139. [PMID: 19602269 PMCID: PMC2717097 DOI: 10.1186/1471-2180-9-139] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Accepted: 07/14/2009] [Indexed: 11/21/2022] Open
Abstract
Background Mycoplasma genitalium is an emerging sexually transmitted pathogen that has been associated with significant reproductive tract inflammatory syndromes in women. In addition, the strong association between severity of M. genitalium infection and Human Immunodeficiency Virus type 1 (HIV-1) shedding from the cervix suggests that innate responses to M. genitalium may influence pathogenesis of other sexually transmitted infections. Epithelial cells (ECs) of the reproductive mucosa are the first cells contacted by sexually transmitted pathogens. Therefore, we first characterized the dynamics of intracellular and extracellular localization and resultant innate immune responses from human vaginal, ecto- and endocervical ECs to M. genitalium type strain G37 and a low-pass contemporary isolate, M2300. Results Both M. genitalium strains rapidly attached to vaginal and cervical ECs by 2 h post-infection (PI). By 3 h PI, M. genitalium organisms also were found in intracellular membrane-bound vacuoles of which approximately 60% were adjacent to the nucleus. Egress of M. genitalium from infected ECs into the culture supernatant was observed but, after invasion, viable intracellular titers were significantly higher than extracellular titers at 24 and 48 h PI. All of the tested cell types responded by secreting significant levels of pro-inflammatory cytokines and chemokines in a pattern consistent with recruitment and stimulation of monocytes and macrophages. Based on the elaborated cytokines, we next investigated the cellular interaction of M. genitalium with human monocyte-derived macrophages and characterized the resultant cytokine responses. Macrophages rapidly phagocytosed M. genitalium resulting in a loss of bacterial viability and a potent pro-inflammatory response that included significant secretion of IL-6 and other cytokines associated with enhanced HIV-1 replication. The macrophage-stimulating capacity of M. genitalium was independent of bacterial viability but was sensitive to heat denaturation and proteinase-K digestion suggesting that M. genitalium protein components are the predominant mediators of inflammation. Conclusion Collectively, the data indicated that human genital ECs were susceptible and immunologically responsive to M. genitalium infection that likely induced cellular immune responses. Although macrophage phagocytosis was an effective method for M. genitalium killing, intracellular localization within vaginal and cervical ECs may provide M. genitalium a survival niche and protection from cellular immune responses thereby facilitating the establishment and maintenance of reproductive tract infection.
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Affiliation(s)
- Chris L McGowin
- Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555-0609, USA.
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Mycoplasma genitalium-encoded MG309 activates NF-kappaB via Toll-like receptors 2 and 6 to elicit proinflammatory cytokine secretion from human genital epithelial cells. Infect Immun 2008; 77:1175-81. [PMID: 19103762 DOI: 10.1128/iai.00845-08] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mycoplasma genitalium has been implicated in several important reproductive tract syndromes in women, including pelvic inflammatory disease, cervicitis, and tubal factor infertility. The mechanisms of immune activation are unclear, and we sought to determine whether M. genitalium was capable of activating innate immune responses through ligation of highly expressed Toll-like receptors (TLR) of the genital tract. Using HEK293 cells expressing specific human TLR, viable M. genitalium and the recombinant C-terminal portion of the immunogenic protein MG309 (rMG309c) were shown to activate NF-kappaB via TLR2/6. These data provided a putative mechanism for activation of the innate response in genital tissues. Genital epithelial cells (EC) are the first responders to sexually transmitted pathogens and express high levels of TLR2 and -6. Following exposure to purified rMG309c, vaginal and ecto- and endocervical EC secreted proinflammatory cytokines, including interleukin-6 (IL-6) and IL-8. Vaginal EC were less responsive than cervical EC. The capacity of rMG309c to bind TLR2/6 and elicit inflammation was sensitive to proteinase K digestion and independent of traditional N-terminal lipoylation. Furthermore, the immunostimulatory capacity of rMG309c was localized specifically to a 91-amino-acid subfragment of the recombinant protein, suggesting that TLR activation is likely amino acid based. Together, these data indicated that human vaginal and cervical EC are immunologically responsive to M. genitalium and to purified rMG309c via highly expressed TLR of the genital tract. These findings provide valuable insights into the mechanisms for activation of acute-phase inflammatory responses and suggest that M. genitalium colonization of reproductive tract tissues may result in inflammatory sequelae.
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