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Magtoto PD, Arruda BL, Magtoto RL, Mora-Díaz JC, Opulencia RB, Baum DH, Zimmerman JJ, Giménez-Lirola LG. Differential antigenicity of individual Mycoplasma hyorhinis variable lipoproteins. Vet Immunol Immunopathol 2024; 272:110768. [PMID: 38703559 DOI: 10.1016/j.vetimm.2024.110768] [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: 03/12/2024] [Revised: 04/19/2024] [Accepted: 04/23/2024] [Indexed: 05/06/2024]
Abstract
The Mycoplasma hyorhinis (Mhr) variable lipoprotein (Vlp) family, comprising Vlps A, B, C, D, E, F, and G, are highly variable in expression, size, and cytoadhesion capabilities across Mhr strains. The 'Vlp system' plays a crucial role in cytoadhesion, immune evasion, and in eliciting a host immunologic response. This pilot study described the development of Vlp peptide-based ELISAs to evaluate the antigenic reactivity of individual Vlps against Mhr antisera collected throughout a longitudinal study focused on Mhr strain 38983, reproducing Mhr-associated disease under experimental conditions. Specifically, serum samples were collected at day post-inoculation 0, 7, 10, 14, 17, 21, 24, 28, 35, 42, 49, and 56 from Mhr- and mock (Friis medium)-inoculated cesarean-derived, colostrum-deprived pigs. Significant Mhr-specific IgG responses were detected at specific time points throughout the infection, with some variations for each Vlp. Overall, individual Vlp ELISAs showed consistently high accuracy rates, except for VlpD, which would likely be associated with its expression levels or the anti-Vlp humoral immune response specific to the Mhr strain used in this study. This study provides the basis and tools for a more refined understanding of these Vlp- and Mhr strain-specific variations, which is foundational in understanding the host immune response to Mhr.
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Affiliation(s)
- Precy D Magtoto
- College of Veterinary Medicine, Pampanga State Agricultural University, Pampanga, the Philippines; College of Arts and Sciences, University of the Philippines Los Baños, Laguna, the Philippines
| | - Bailey L Arruda
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA; Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA, USA
| | - Ronaldo L Magtoto
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA
| | - Juan Carlos Mora-Díaz
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA
| | - Rina B Opulencia
- College of Arts and Sciences, University of the Philippines Los Baños, Laguna, the Philippines
| | - David H Baum
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA
| | - Jeff J Zimmerman
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA
| | - Luis G Giménez-Lirola
- Department of Veterinary Diagnostic and Production Animal Medicine, Iowa State University, Ames, IA, USA.
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2
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Xiu F, Li X, Liu L, Xi Y, Yi X, Li Y, You X. Mycoplasma invasion into host cells: An integrated model of infection strategy. Mol Microbiol 2024; 121:814-830. [PMID: 38293733 DOI: 10.1111/mmi.15232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 01/12/2024] [Accepted: 01/16/2024] [Indexed: 02/01/2024]
Abstract
Mycoplasma belong to the genus Mollicutes and are notable for their small genome sizes (500-1300 kb) and limited biosynthetic capabilities. They exhibit pathogenicity by invading various cell types to survive as intracellular pathogens. Adhesion is a crucial prerequisite for successful invasion and is orchestrated by the interplay between mycoplasma surface adhesins and specific receptors on the host cell membrane. Invasion relies heavily on clathrin- and caveolae-mediated internalization, accompanied by multiple activated kinases, cytoskeletal rearrangement, and a myriad of morphological alterations, such as membrane invagination, nuclear hypertrophy and aggregation, cytoplasmic edema, and vacuolization. Once mycoplasma successfully invade host cells, they establish resilient sanctuaries in vesicles, cytoplasm, perinuclear regions, and the nucleus, wherein specific environmental conditions favor long-term survival. Although lysosomal degradation and autophagy can eliminate most invading mycoplasmas, some viable bacteria can be released into the extracellular environment via exocytosis, a crucial factor in the prolonging infection persistence. This review explores the intricate mechanisms by which mycoplasma invades host cells and perpetuates their elusive survival, with the aim of highlighting the challenge of eradicating this enigmatic bacterium.
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Affiliation(s)
- Feichen Xiu
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
| | - Xinru Li
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
| | - Lu Liu
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
| | - Yixuan Xi
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
| | - Xinchao Yi
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
| | - Yumeng Li
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Xiaoxing You
- Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
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Pageaut H, Lacouture S, Lehoux M, Marois-Créhan C, Segura M, Gottschalk M. Interactions of Mycoplasma hyopneumoniae and/or Mycoplasma hyorhinis with Streptococcus suis Serotype 2 Using In Vitro Co-Infection Models with Swine Cells. Pathogens 2023; 12:866. [PMID: 37513713 PMCID: PMC10383509 DOI: 10.3390/pathogens12070866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/17/2023] [Accepted: 06/20/2023] [Indexed: 07/30/2023] Open
Abstract
Bacterial and/or viral co-infections are very common in swine production and cause severe economic losses. Mycoplasma hyopneumoniae, Mycoplasma hyorhinis and Streptococcus suis are pathogenic bacteria that may be found simultaneously in the respiratory tracts of pigs. In the present study, the interactions of S. suis with epithelial and phagocytic cells in the presence or absence of a pre-infection with M. hyopneumoniae and/or M. hyorhinis were studied. Results showed relatively limited interactions between these pathogens. A previous infection with one or both mycoplasmas did not influence the adhesion or invasion properties of S. suis in epithelial cells or its resistance to phagocytosis (including intracellular survival) by macrophages and dendritic cells. The most important effect observed during the co-infection was a clear increment in toxicity for the cells. An increase in the relative expression of the pro-inflammatory cytokines IL-6 and CXCL8 was also observed; however, this was the consequence of an additive effect due to the presence of different pathogens rather than a synergic effect. It may be hypothesized that if one or both mycoplasmas are present along with S. suis in the lower respiratory tract at the same time, then increased damage to epithelial cells and phagocytes, as well as an increased release of pro-inflammatory cytokines, may eventually enhance the invasive properties of S. suis. However, more studies should be carried out to confirm this hypothesis.
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Affiliation(s)
- Héloïse Pageaut
- Swine and Poultry Infectious Diseases Research Center (CRIPA) and Groupe de Recherche sur les Maladies Infectieuses en Production Animale, Faculty of Veterinary Medicine, University of Montreal, 3200 Sicotte St., Saint-Hyacinthe, QC J2S 2M2, Canada
| | - Sonia Lacouture
- Swine and Poultry Infectious Diseases Research Center (CRIPA) and Groupe de Recherche sur les Maladies Infectieuses en Production Animale, Faculty of Veterinary Medicine, University of Montreal, 3200 Sicotte St., Saint-Hyacinthe, QC J2S 2M2, Canada
| | - Mélanie Lehoux
- Swine and Poultry Infectious Diseases Research Center (CRIPA) and Groupe de Recherche sur les Maladies Infectieuses en Production Animale, Faculty of Veterinary Medicine, University of Montreal, 3200 Sicotte St., Saint-Hyacinthe, QC J2S 2M2, Canada
| | - Corinne Marois-Créhan
- Ploufragan-Plouzané-Niort Laboratory, Mycoplasmology Bacteriology and Antimicrobial Resistance Unit, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), 22 440 Ploufragan, France
| | - Mariela Segura
- Swine and Poultry Infectious Diseases Research Center (CRIPA) and Groupe de Recherche sur les Maladies Infectieuses en Production Animale, Faculty of Veterinary Medicine, University of Montreal, 3200 Sicotte St., Saint-Hyacinthe, QC J2S 2M2, Canada
| | - Marcelo Gottschalk
- Swine and Poultry Infectious Diseases Research Center (CRIPA) and Groupe de Recherche sur les Maladies Infectieuses en Production Animale, Faculty of Veterinary Medicine, University of Montreal, 3200 Sicotte St., Saint-Hyacinthe, QC J2S 2M2, Canada
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Wang J, Yu Y, Li Y, Li S, Wang L, Wei Y, Wu Y, Pillay B, Olaniran AO, Chiliza TE, Shao G, Feng Z, Xiong Q. A multifunctional enolase mediates cytoadhesion and interaction with host plasminogen and fibronectin in Mycoplasma hyorhinis. Vet Res 2022; 53:26. [PMID: 35337383 PMCID: PMC8951703 DOI: 10.1186/s13567-022-01041-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 02/11/2022] [Indexed: 11/10/2022] Open
Abstract
Mycoplasma hyorhinis may cause systemic inflammation of pigs, typically polyserositis and arthritis, and is also associated with several types of human cancer. However, the pathogenesis of M. hyorhinis colonizing and breaching the respiratory barrier to establish systemic infection is poorly understood. Glycolytic enzymes are important moonlighting proteins and virulence-related factors in various bacteria. In this study, we investigated the functions of a glycolytic critical enzyme, enolase in the infection and systemic spread of M. hyorhinis. Bacterial surface localization of enolase was confirmed by flow cytometry and colony hybridization assay. Recombinant M. hyorhinis enolase (rEno) was found to adhere to pig kidney (PK-15) cells, and anti-rEno serum significantly decreased adherence. The enzyme was also found to bind host plasminogen and fibronectin, and interactions were specific and strong, with dissociation constant (KD) values of 1.4 nM and 14.3 nM, respectively, from surface plasmon resonance analysis. Activation of rEno-bound plasminogen was confirmed by its ability to hydrolyze plasmin-specific substrates and to degrade a reconstituted extracellular matrix. To explore key sites during these interactions, C-terminal lysine residues of enolase were replaced with leucine, and the resulting single-site and double-site mutants show significantly reduced interaction with plasminogen in far-Western blotting and surface plasmon resonance tests. The binding affinities of all mutants to fibronectin were reduced as well. Collectively, these results imply that enolase moonlights as an important adhesin of M. hyorhinis, and interacts with plasminogen and fibronectin. The two lysine residues in the C-terminus are important binding sites for its multiple binding activities.
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Affiliation(s)
- Jia Wang
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa
| | - Yanfei Yu
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
| | - Yao Li
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,School of Life Sciences, Jiangsu University, Zhenjiang, China
| | - Shiyang Li
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
| | - Li Wang
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Yanna Wei
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa
| | - Yuzi Wu
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Bala Pillay
- College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa
| | | | - Thamsanqa E Chiliza
- College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa
| | - Guoqing Shao
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa
| | - Zhixin Feng
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China.,College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa
| | - Qiyan Xiong
- Institute of Veterinary Medicine, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Jiangsu Academy of Agricultural Sciences, Nanjing, China. .,College of Agriculture, Engineering & Science, University of KwaZulu-Natal, Durban, South Africa. .,School of Life Sciences, Jiangsu University, Zhenjiang, China.
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Nascimento Araujo CD, Amorim AT, Barbosa MS, Alexandre JCPL, Campos GB, Macedo CL, Marques LM, Timenetsky J. Evaluating the presence of Mycoplasma hyorhinis, Fusobacterium nucleatum, and Helicobacter pylori in biopsies of patients with gastric cancer. Infect Agent Cancer 2021; 16:70. [PMID: 34949212 PMCID: PMC8705184 DOI: 10.1186/s13027-021-00410-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 12/13/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Gastric cancer is the third leading cause of cancer-related deaths worldwide and has been associated with infections that may promote tumour progression. Accordingly, we analysed the presence of Mollicutes, Mycoplasma hyorhinis, Fusobacterium nucleatum and Helicobacter pylori in gastric cancer tissues and evaluated their correlation with clinicopathological factors. METHODS Using a commercial kit, DNA were extracted from 120 gastric samples embedded in paraffin: 80 from patients with gastric cancer and 40 from cancer free patients, dating from 2006 to 2016. Mollicutes and H. pylori were detected by PCR; F. nucleatum and M. hyorhinis were detected by qPCR, together with immunohistochemistry for the latter bacteria. RESULTS Mollicutes were detected in the case and control groups (12% and 2.5%) and correlated with the papillary histologic pattern (P = 0.003), likely due to cell transformation promoted by Mollicutes. M. hyorhinis was detected in the case and control group but was not considered a cancer risk factor. H. pylori was detected at higher loads in the case compared to the control group (8% and 22%, P = 0.008) and correlated with metastasis (P = 0.024), lymphatic invasion (P = 0.033), tumour of diffused type (P = 0.028), and histopathological grading G1/G2 (P = 0.008). F. nucleatum was the most abundant bacteria in the case group, but was also detected in the control group (26% and 2.5%). It increased the cancer risk factor (P = 0.045, OR = 10.562, CI95% = 1.057-105.521), and correlated with old age (P = 0.030) and tumour size (P = 0.053). Bacterial abundance was significantly different between groups (P = 0.001). CONCLUSION Our findings could improve the control and promote our understanding of opportunistic bacteria and their relevance to malignant phenotypes.
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Affiliation(s)
- Camila do Nascimento Araujo
- Department of Microbiology, Institute of Biomedical Sciences, ICB/USP, University of São Paulo, São Paulo, Brazil
| | - Aline Teixeira Amorim
- Department of Microbiology, Institute of Biomedical Sciences, ICB/USP, University of São Paulo, São Paulo, Brazil
| | - Maysa Santos Barbosa
- Department of Microbiology, Institute of Biomedical Sciences, ICB/USP, University of São Paulo, São Paulo, Brazil
| | | | - Guilherme Barreto Campos
- Department of Microbiology, Institute of Biomedical Sciences, ICB/USP, University of São Paulo, São Paulo, Brazil.,Multidisciplinary Health Institute /Campus Anísio Teixeira, IMS/CAT - UFBA, Federal University of Bahia, Vitória da Conquista, Brazil
| | - Cláudia Leal Macedo
- Micro - Pathological Anatomy and Cytopathology Service, Vitória da Conquista, Brazil
| | - Lucas Miranda Marques
- Department of Microbiology, Institute of Biomedical Sciences, ICB/USP, University of São Paulo, São Paulo, Brazil. .,Multidisciplinary Health Institute /Campus Anísio Teixeira, IMS/CAT - UFBA, Federal University of Bahia, Vitória da Conquista, Brazil.
| | - Jorge Timenetsky
- Department of Microbiology, Institute of Biomedical Sciences, ICB/USP, University of São Paulo, São Paulo, Brazil
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Evaluation of colonization, variable lipoprotein-based serological response, and cellular immune response of Mycoplasma hyorhinis in experimentally infected swine. Vet Microbiol 2021; 260:109162. [PMID: 34217902 DOI: 10.1016/j.vetmic.2021.109162] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 06/17/2021] [Indexed: 11/22/2022]
Abstract
Mycoplasma hyorhinis (Mhr) is a commensal of the upper respiratory tract that can be shed by nasal secretions and transmitted by direct contact in neonatal and nursery pigs. Lesions associated with Mhr infection include polyserositis and arthritis; however, systemic Mhr disease pathogenesis is not well characterized. This study aimed to investigate the immunopathogenesis and bacterial dissemination pattern of Mhr using single and multiple inoculation approaches in a caesarian-derived colostrum-deprived (CDCD) pig model. Animals in three treatment groups were inoculated once (Mhr 1; n = 12) or four (Mhr 2; n = 8) times with Mhr or sham-inoculated (NC group; n = 3) nasally and by tonsillar painting. Inoculum consisted of a triple cloned Mhr field isolate (4.5 × 107 CFU/mL) in Friis medium. Clinical signs were evaluated daily during the study. Serum and oral fluid antibody (IgA and IgG) response and cellular immune response were assessed using a recombinant chimeric VlpA-G-based indirect ELISA and by ELISpot, respectively. The presence of Mhr in oral fluids, nasal and oropharyngeal swabs were evaluated by qPCR. At 6 wpi, pigs were euthanized and evaluated for gross lesions consistent with Mhr and bacterial colonization in tonsils by qPCR. No clinical signs or gross lesions consistent with Mhr-associated disease were observed throughout the study. For Mhr 2 group, the presence of IgA and IgG in serum and oral fluids were detected at 2 and 4 weeks post-inoculation (wpi), respectively, while in Mhr 1, only IgA was detected in oral fluids at 6 wpi. The proportion of animals shedding Mhr in nasal secretions varied from 20 to 40 % in the Mhr 1 and 62.5-100% in the Mhr 2 group. However, the proportion of animals shedding Mhr in oropharyngeal swabs was consistent through the study (60 %) in Mhr 1 and fluctuated from 20 % to 87.5 % in Mhr 2 group. The lack of clinical signs and the presence of Mhr specific humoral response and bacterial colonization indicates that the multiple inoculation experimental model may mimic subclinical natural infection in the field. In addition, the humoral and transient cellular response did not result in bacterial clearance. Based on these results, animals would have to be exposed multiple times to mount a detectable immune response.
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Identification and Characterization of Nasal Polyposis and Mycoplasma Superinfection by Scanning Electron Microscopy and Nasal Cytology with Optical Microscopy: A Case Report. Diagnostics (Basel) 2019; 9:diagnostics9040174. [PMID: 31689994 PMCID: PMC6963757 DOI: 10.3390/diagnostics9040174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 10/29/2019] [Accepted: 11/02/2019] [Indexed: 02/01/2023] Open
Abstract
Nasal polyposis is characterized by benign, non-cancerous and painless growths originating in the tissue of the nasal cavities and paranasal sinuses. Polyps arise from chronic inflammation due to asthma, recurrent infections, allergies, drug sensitivity or immune disorders. They can obstruct the nasal cavities and thus cause respiratory problems, a reduction in the sense of smell and susceptibility to infections. Furthermore, nasal polyps can recur. Hence the importance of using valid diagnostic methods. In this work, the diagnostic investigation carried out by scanning electron microscopy (SEM) and nasal cytology led, for the first time, to the identification of a mycoplasma superinfection on nasal polyposis.
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Weng J, Li Y, Cai L, Li T, Peng G, Fu C, Han X, Li H, Jiang Z, Zhang Z, Du J, Peng Q, Gao Y. Elimination of Mycoplasma Contamination from Infected Human Hepatocyte C3A Cells by Intraperitoneal Injection in BALB/c Mice. Front Cell Infect Microbiol 2017; 7:440. [PMID: 29075618 PMCID: PMC5643414 DOI: 10.3389/fcimb.2017.00440] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 09/26/2017] [Indexed: 02/05/2023] Open
Abstract
Background/Aims: The use of antibiotics to eliminate Mycoplasma contamination has some serious limitations. Mycoplasma contamination can be eliminated by intraperitoneal injection of BALB/c mice with contaminated cells combined with screening monoclonal cells. However, in vivo passage in mice after injection with contaminated cells requires a long duration (20-54 days). Furthermore, it is important to monitor for cross-contamination of mouse and human cells, xenotropic murine leukemia virus-related virus (XMRV) infection, and altered cell function after the in vivo treatment. The present study aimed to validate a reliable and simplified method to eliminate mycoplasma contamination from human hepatocytes. BALB/c mice were injected with paraffin oil prior to injection with cells, in order to shorten duration of intraperitoneal passage. Cross-contamination of mouse and human cells, XMRV infection and cell function-related genes and proteins were also evaluated. Methods: PCR and DNA sequencing were used to confirm Mycoplasma hyorhinis (M. hyorhinis) contamination in human hepatocyte C3A cells. Five BALB/c mice were intraperitoneally injected with 0.5 ml paraffin oil 1 week before injection of the cells. The mice were then intraperitoneally injected with C3A hepatocytes (5.0 × 106/ml) contaminated with M. hyorhinis (6.2 ± 2.2 × 108 CFU/ml). Ascites were collected for monoclonal cell screening on the 14th day after injection of contaminated cells. Elimination of mycoplasma from cells was determined by PCR and Transmission Electron Microscopy (TEM). Human-mouse cell and XMRV contamination were also detected by PCR. Quantitative reverse transcription PCR and western blotting were used to compare the expression of genes and proteins among treated cells, non-treated infected cells, and uninfected cells. Results: Fourteen days after injection with cells, 4 of the 5 mice had ascites. Hepatocyte colonies extracted from the ascites of four mice were all mycoplasma-free. There was no cell cross-contamination or XMRV infection in treated cell cultures. Elimination of Mycoplasma resulted in partial or complete recovery in the expression of ALB, TF, and CYP3A4 genes as well as proteins. Proliferation of the treated cells was not significantly affected by this management. Conclusion: The method of elimination of Mycoplasma contamination in this study was validated and reproducible. Success was achieved in four of five cases examined. Compared to the previous studies, the duration of intraperitoneal passage in this study was significantly shorter.
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Affiliation(s)
- Jun Weng
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Yang Li
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Lei Cai
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Ting Li
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Gongze Peng
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Chaoyi Fu
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Xu Han
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Haiyan Li
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Zesheng Jiang
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Zhi Zhang
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
| | - Jiang Du
- Department of Pediatrics, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Qing Peng
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
- State Key Laboratory of Organ Failure Research, Southern Medical University, Guangzhou, China
| | - Yi Gao
- Department of Hepatobiliary Surgery II, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Artificial Organs and Tissue Engineering Centre of Guangdong Province, Guangzhou, China
- State Key Laboratory of Organ Failure Research, Southern Medical University, Guangzhou, China
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