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Liu D, Luo R, Zhou Q, Li M. RNF20 Reduces Cell Proliferation and Warburg Effect by Promoting NLRP3 Ubiquitination in Liver Cancer. J Environ Pathol Toxicol Oncol 2024; 43:69-80. [PMID: 38608146 DOI: 10.1615/jenvironpatholtoxicoloncol.2024053012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2024] Open
Abstract
The present study explored that the effects and its possible mechanisms of ring finger protein 20 (RNF20) in Postoperative survival rate of liver cancer in clinical. All the serum samples were collected from our hospital. Quantitative polymerase chain reaction (PCR) and microarray analysis, and RNA pull down assay were used in this study. We found that the serum RNF20 mRNA expression level in patients with liver cancer were down-regulated. Postoperative survival rate of RNF20 high expression was higher than that of RNF20 low expression. Then, over-expression of RNF20 diminished liver cancer cell proliferation and metastasis. RNF20 reduced Warburg effect of liver cancer. RNF20 expression regulated NOD-like receptor protein 3 (NLRP3) expression and increased NLRP3 Ubiquitination. NLRP3 participated in the effects of RNF20 on cell proliferation, and not affected on Warburg effect of liver cancer. Our study demonstrated that the serum RNF20 expression level was down-regulated in liver cancer, and promoted postoperative survival rate. RNF20 can reduce cancer progression of liver cancer by NLRP3 signal pathway, suggesting that it may prove to be a potential therapeutic target for postoperative survival rate of liver cancer.
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Affiliation(s)
- Deqin Liu
- Department of Hepatobiliary Surgery, Dayi County People's Hospital, Chengdu City, Sichuan Province, China
| | - Renyin Luo
- Department of Hepatobiliary Surgery, Affiliated Hospital of Panzhihua University, Panzhihua City, Sichuan Province, China
| | - Qian Zhou
- Operating Room, BOE Hospital, Chengdu, Sichuan Province, China
| | - Mei Li
- Panzhihua Central Hospital
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2
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Carrillo-Ávila JA, de la Fuente A, Aguilar-Quesada R, Ligero G, del Río-Ortiz JM, Catalina P. Development and Evaluation of a New qPCR Assay for the Detection of Mycoplasma in Cell Cultures. Curr Issues Mol Biol 2023; 45:6903-6915. [PMID: 37623254 PMCID: PMC10453501 DOI: 10.3390/cimb45080435] [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: 07/24/2023] [Revised: 08/11/2023] [Accepted: 08/16/2023] [Indexed: 08/26/2023] Open
Abstract
In recent years, cell culture has become an important tool not only in research laboratories, but also in diagnostic and biotechnological development laboratories. Mycoplasma contamination is present in up to 35% of cell cultures used in research and in cell therapies. This fact represents a significant problem since such contamination can cause disastrous effects on eukaryotic cells by altering their cellular parameters, which, in turn, can lead to unreliable experimental results. For this reason, it is mandatory to carry out continuous testing for the presence of Mycoplasma in cell culture and the development of appropriate methodologies for this purpose. An ideal detection methodology should be fast, sensitive, and reliable. In this study, we propose an alternative detection method based on real-time PCR in conjunction with a novel combination of primers and probes that have been improved to increase their efficiency. The new PCR method demonstrates 100% sensitivity and specificity results in the detection of common Mycoplasma species that contaminate cell cultures. Whilst 11 of 45 tested supernatants were positive for Mycoplasma (24.4%) using the new PCR method (corresponding to 5 of the 14 lines tested (35.71%)), only 10 of 45 supernatants showed positive results with the commercial Venor®GeM qEP and Plasmotest® kit. In addition, the new PCR method exhibits a high capacity to detect less-frequent Mycoplasma species, such as those related to the M. mycoides cluster. The use of an alternative Mycoplasma-detection method in cell culture labs can guarantee the detection of Mycoplasma contamination, especially in cases when dubious results are recorded.
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Affiliation(s)
- José A. Carrillo-Ávila
- Andalusian Public Health System Biobank, Coordinating Node, Av. del Conocimiento, S/N, 18016 Granada, Spain; (A.d.l.F.); (R.A.-Q.); (G.L.); (J.M.d.R.-O.); (P.C.)
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3
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Martins LA, Palmisano G, Cortez M, Kawahara R, de Freitas Balanco JM, Fujita A, Alonso BI, Barros-Battesti DM, Braz GRC, Tirloni L, Esteves E, Daffre S, Fogaça AC. The intracellular bacterium Rickettsia rickettsii exerts an inhibitory effect on the apoptosis of tick cells. Parasit Vectors 2020; 13:603. [PMID: 33261663 PMCID: PMC7706286 DOI: 10.1186/s13071-020-04477-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 11/05/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Rickettsia rickettsii is a tick-borne obligate intracellular bacterium that causes Rocky Mountain spotted fever, a life-threatening illness. To obtain an insight into the vector-pathogen interactions, we assessed the effects of infection with R. rickettsii on the proteome cells of the tick embryonic cell line BME26. METHODS The proteome of BME26 cells was determined by label-free high-performance liquid chromatography coupled with tandem mass spectrometry analysis. Also evaluated were the effects of infection on the activity of caspase-3, assessed by the hydrolysis of a synthetic fluorogenic substrate in enzymatic assays, and on the exposition of phosphatidyserine, evaluated by live-cell fluorescence microscopy after labeling with annexin-V. Finally, the effects of activation or inhibition of caspase-3 activity on the growth of R. rickettsii in BME26 cells was determined. RESULTS Tick proteins of different functional classes were modulated in a time-dependent manner by R. rickettsii infection. Regarding proteins involved in apoptosis, certain negative regulators were downregulated at the initial phase of the infection (6 h) but upregulated in the middle of the exponential phase of the bacterial growth (48 h). Microorganisms are known to be able to inhibit apoptosis of the host cell to ensure their survival and proliferation. We therefore evaluated the effects of infection on classic features of apoptotic cells and observed DNA fragmentation exclusively in noninfected cells. Moreover, both caspase-3 activity and phosphatidylserine exposition were lower in infected than in noninfected cells. Importantly, while the activation of caspase-3 exerted a detrimental effect on rickettsial proliferation, its inhibition increased bacterial growth. CONCLUSIONS Taken together, these results show that R. rickettsii modulates the proteome and exerts an inhibitory effect on apoptosis in tick cellsthat seems to be important to ensure cell colonization.
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Affiliation(s)
- Larissa Almeida Martins
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.,Rocky Mountain Laboratories, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Hamilton, USA
| | - Giuseppe Palmisano
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Mauro Cortez
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Rebeca Kawahara
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.,Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
| | | | - André Fujita
- Department of Computational Science, Institute of Mathematics and Statistics, University of São Paulo, São Paulo, SP, Brazil
| | - Beatriz Iglesias Alonso
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | | | - Gloria Regina Cardoso Braz
- Department of Biochemistry, Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Lucas Tirloni
- Rocky Mountain Laboratories, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Hamilton, MT, USA
| | - Eliane Esteves
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Sirlei Daffre
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Andréa Cristina Fogaça
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.
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Desbrousses C, Archer F, Colin A, Bobet-Erny A, Champavère A, Gros E, Beurdeley P, Cruveiller S, Tardy F, Eloit M. High-Throughput Sequencing (HTS) of newly synthetized RNAs enables one shot detection and identification of live mycoplasmas and differentiation from inert nucleic acids. Biologicals 2020; 65:18-24. [PMID: 32222272 DOI: 10.1016/j.biologicals.2020.03.002] [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: 10/18/2019] [Revised: 02/19/2020] [Accepted: 03/11/2020] [Indexed: 11/26/2022] Open
Abstract
Mycoplasma contamination threatens both the safety of biologics produced in cell substrates as well as the quality of scientific results based on cell-culture observations. Methods currently used to detect contamination of cells include culture, enzymatic activity, immunofluorescence and PCR but suffer from some limitations. High throughput sequencing (HTS) can be used to identify microbes like mycoplasmas in biologics since it enables an unbiased approach to detection without the need to design specific primers to pre-amplify target sequences but it does not enable the confirmation of microbial infection since this could reflect carryover of inert sequences. In order to unambiguously differentiate the presence of live or dead mycoplasmas in biological products, the present method was developed based on metabolic RNA labelling of newly synthetized mycoplasmal RNAs. HTS of labelled RNA detected A549 cell infection with Acholeplasma laidlawii in a manner similar to both PCR and culture and demonstrated that this technique can unambiguously identify bacterial species and differentiates infected cells from cells exposed to a high inoculum of heat-inactivated mycoplasmas. This method therefore combines the advantage of culture (that detects only live microorganisms) with those of molecular tests (rapidity) together with a very broad range of bacterial detection and identification.
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Affiliation(s)
| | - Fabienne Archer
- University of Lyon, Université Claude Bernard Lyon1, INRAE, EPHE, IVPC, Viral Infections and Comparative Pathology, UMR754, F69007, Lyon, France
| | - Adélie Colin
- Université de Lyon, Anses Laboratoire de Lyon, VetAgro Sup, UMR Mycoplasmoses des Ruminants, F69364, Lyon, France
| | - Alexandra Bobet-Erny
- University of Lyon, Université Claude Bernard Lyon1, INRAE, EPHE, IVPC, Viral Infections and Comparative Pathology, UMR754, F69007, Lyon, France
| | - Angélique Champavère
- University of Lyon, Université Claude Bernard Lyon1, INRAE, EPHE, IVPC, Viral Infections and Comparative Pathology, UMR754, F69007, Lyon, France
| | | | | | | | - Florence Tardy
- Université de Lyon, Anses Laboratoire de Lyon, VetAgro Sup, UMR Mycoplasmoses des Ruminants, F69364, Lyon, France
| | - Marc Eloit
- PathoQuest, Paris, France; Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, Maisons-Alfort, 94704 Cedex, France; Pathogen Discovery Laboratory, Institut Pasteur, Paris, France.
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5
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Lee RS, Zhang L, Berger A, Lawrence MG, Song J, Niranjan B, Davies RG, Lister NL, Sandhu SK, Rubin MA, Risbridger GP, Taylor RA, Rickman DS, Horvath LG, Daly RJ. Characterization of the ERG-regulated Kinome in Prostate Cancer Identifies TNIK as a Potential Therapeutic Target. Neoplasia 2019; 21:389-400. [PMID: 30901730 PMCID: PMC6426874 DOI: 10.1016/j.neo.2019.02.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 02/05/2019] [Accepted: 02/26/2019] [Indexed: 12/22/2022] Open
Abstract
Approximately 50% of prostate cancers harbor the TMPRSS2:ERG fusion, resulting in elevated expression of the ERG transcription factor. Despite the identification of this subclass of prostate cancers, no personalized therapeutic strategies have achieved clinical implementation. Kinases are attractive therapeutic targets as signaling networks are commonly perturbed in cancers. The impact of elevated ERG expression on kinase signaling networks in prostate cancer has not been investigated. Resolution of this issue may identify novel therapeutic approaches for ERG-positive prostate cancers. In this study, we used quantitative mass spectrometry-based kinomic profiling to identify ERG-mediated changes to cellular signaling networks. We identified 76 kinases that were differentially expressed and/or phosphorylated in DU145 cells engineered to express ERG. In particular, the Traf2 and Nck-interacting kinase (TNIK) was markedly upregulated and phosphorylated on multiple sites upon ERG overexpression. Importantly, TNIK has not previously been implicated in prostate cancer. To validate the clinical relevance of these findings, we characterized expression of TNIK and TNIK phosphorylated at serine 764 (pS764) in a localized prostate cancer patient cohort and showed that nuclear enrichment of TNIK (pS764) was significantly positively correlated with ERG expression. Moreover, TNIK protein levels were dependent upon ERG expression in VCaP cells and primary cells established from a prostate cancer patient-derived xenograft. Furthermore, reduction of TNIK expression and activity by silencing TNIK expression or using the TNIK inhibitor NCB-0846 reduced cell viability, colony formation and anchorage independent growth. Therefore, TNIK represents a novel and actionable therapeutic target for ERG-positive prostate cancers that could be exploited to develop new treatments for these patients.
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Affiliation(s)
- Rachel S Lee
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Biochemistry and Molecular Biology, Monash University, Victoria, Australia
| | - Luxi Zhang
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Biochemistry and Molecular Biology, Monash University, Victoria, Australia
| | - Adeline Berger
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Mitchell G Lawrence
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Anatomy and Developmental Biology, Monash University, Victoria, Australia; Cancer Research Division, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Jiangning Song
- Infection and Immunity Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Monash Centre for Data Science, Faculty of Information Technology, Monash University, Victoria, Australia
| | - Birunthi Niranjan
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Anatomy and Developmental Biology, Monash University, Victoria, Australia
| | - Rebecca G Davies
- Department of Biochemistry and Molecular Biology, Monash University, Victoria, Australia
| | - Natalie L Lister
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Anatomy and Developmental Biology, Monash University, Victoria, Australia
| | - Shahneen K Sandhu
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia; Division of Cancer Medicine, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Mark A Rubin
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA; Meyer Cancer Center, Weill Cornell Medicine, New York, New York, USA; Englander Institute for Precision Medicine, New York-Presbyterian Hospital, Weill Cornell Medicine, New York, New York, USA; Department of Physiology and Biophysics, Institute for Computational Biomedicine, Weill Cornell Medicine, New York, New York, USA
| | - Gail P Risbridger
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Anatomy and Developmental Biology, Monash University, Victoria, Australia; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia; Division of Cancer Medicine, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Renea A Taylor
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia; Department of Physiology, Monash University, Victoria, Australia
| | - David S Rickman
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA; Meyer Cancer Center, Weill Cornell Medicine, New York, New York, USA; Englander Institute for Precision Medicine, New York-Presbyterian Hospital, Weill Cornell Medicine, New York, New York, USA
| | - Lisa G Horvath
- Chris O'Brien Lifehouse, Sydney, New South Wales, Australia; Sydney Medical School, The University of Sydney, New South Wales, Australia; Department of Medical Oncology, Royal Prince Alfred Hospital, New South Wales, Australia; Garvan Institute for Medical Research, New South Wales, Australia
| | - Roger J Daly
- Cancer Program, Biomedicine Discovery Institute, Monash University, Victoria, Australia; Department of Biochemistry and Molecular Biology, Monash University, Victoria, Australia.
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6
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Hemmatzadeh F, Niap F, Bennett BA, Trott DJ, Peaston AE. A novel quantitative polymerase chain reaction to monitor urinary tract mycoplasma infection in a dog. Lett Appl Microbiol 2019; 68:409-414. [PMID: 30793339 DOI: 10.1111/lam.13139] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/05/2018] [Accepted: 08/05/2018] [Indexed: 11/30/2022]
Abstract
The aim of the study was to develop a quantitative real-time PCR assay for diagnosis and monitoring of mycoplasma urinary tract infections (UTI) in a dog. An English Cocker Spaniel dog with the history of urinary tract infection was physically examined and laboratory findings identified chronic renal insufficiency and urinary tract infection. Attempts to culture organisms from pyuric urine failed, and empirical antibiotic therapy did not resolve the pyuria. A mycoplasma species most closely resembling Ureaplasma canigenitalium was identified in urine samples by conventional PCR and sequencing. A quantitative PCR method was developed to monitor and finally verify successful treatment. This novel approach to monitoring mycoplasma urinary tract infections is conceptually simple, and provides rapid results. It may have wider application in monitoring treatment efficacy for infections with other Mycoplasma spp. as well as additional organisms that are difficult to culture. SIGNIFICANCE AND IMPACT OF THE STUDY: In this study, we highlight two different findings, detection of Ureaplasma canigenitalium in a dog with chronic urinary tract infection and development of a quantitative real-time PCR test to track treatment results in an infected dog. This report is the first report of detection of U. canigenitalium in one dog in Australia. This novel qPCR method for monitoring mycoplasma urinary tract infections is conceptually simple and provides results fast. It will have wider applications in monitoring treatment efficacy for infections with mycoplasmas and mycoplasma-like organisms that are difficult to culture, and provides a sensitive guide to treatment progress.
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Affiliation(s)
- F Hemmatzadeh
- School of Animal and Veterinary Science, The University of Adelaide, Adelaide, SA, Australia
| | - F Niap
- School of Animal and Veterinary Science, The University of Adelaide, Adelaide, SA, Australia
| | - B A Bennett
- School of Animal and Veterinary Science, The University of Adelaide, Adelaide, SA, Australia
| | - D J Trott
- School of Animal and Veterinary Science, The University of Adelaide, Adelaide, SA, Australia
| | - A E Peaston
- School of Animal and Veterinary Science, The University of Adelaide, Adelaide, SA, Australia
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7
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Tumor-Associated Macrophages Induce Endocrine Therapy Resistance in ER+ Breast Cancer Cells. Cancers (Basel) 2019; 11:cancers11020189. [PMID: 30736340 PMCID: PMC6406935 DOI: 10.3390/cancers11020189] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 01/09/2019] [Accepted: 01/15/2019] [Indexed: 02/07/2023] Open
Abstract
Antiestrogenic adjuvant treatments are first-line therapies in patients with breast cancer positive for estrogen receptor (ER+). Improvement of their treatment strategies is needed because most patients eventually acquire endocrine resistance and many others are initially refractory to anti-estrogen treatments. The tumor microenvironment plays essential roles in cancer development and progress; however, the molecular mechanisms underlying such effects remain poorly understood. Breast cancer cell lines co-cultured with TNF-α-conditioned macrophages were used as pro-inflammatory tumor microenvironment models. Proliferation, migration, and colony formation assays were performed to evaluate tamoxifen and ICI 182,780 resistance and confirmed in a mouse-xenograft model. Molecular mechanisms were investigated using cytokine antibody arrays, WB, ELISA, ChIP, siRNA, and qPCR-assays. In our simulated pro-inflammatory tumor microenvironment, tumor-associated macrophages promoted proliferation, migration, invasiveness, and breast tumor growth of ER+ cells, rendering these estrogen-dependent breast cancer cells resistant to estrogen withdrawal and tamoxifen or ICI 182,780 treatment. Crosstalk between breast cancer cells and conditioned macrophages induced sustained release of pro-inflammatory cytokines from both cell types, activation of NF-κB/STAT3/ERK in the cancer cells and hyperphosphorylation of ERα, which resulted constitutively active. Our simulated tumor microenvironment strongly altered endocrine and inflammatory signaling pathways in breast cancer cells, leading to endocrine resistance in these cells.
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8
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LIU R, CHEN C, HUANG Y, CHENG L, LU R, FU G, SHI S, CHEN H, WAN C, FU Q, LIN J. Microbiological identification and analysis of waterfowl livers collected from backyard farms in southern China. J Vet Med Sci 2018; 80:667-671. [PMID: 29398671 PMCID: PMC5938198 DOI: 10.1292/jvms.17-0452] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 01/14/2018] [Indexed: 11/22/2022] Open
Abstract
In total, 985 livers were collected from 275 backyard waterfowl farms distributed in seven provinces of southern China. The virus that was most commonly isolated was avian influenza virus, with a 12.1% positivity rate. Of the other positive samples, 10.6% tested positive for avian Tembusu virus, 6.8% for duck hepatitis A virus, 3.8% for duck plague virus, 3.4% for Muscovy duck parvovirus, 3.1% for goose parvovirus, 1.0% for mycoplasma and 0.9% for respiratory enteric orphan virus. The bacterium that was most commonly isolated was Escherichia coli, with a 47.1% positivity rate. This survey suggests that backyard waterfowl in southern China could be an important vector for the storage, variation, and transmission of various pathogens.
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Affiliation(s)
- Rongchang LIU
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Cuiteng CHEN
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Yu HUANG
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Longfei CHENG
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Ronghui LU
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Guanghua FU
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Shaohua SHI
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Hongmei CHEN
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Chunhe WAN
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Qiuling FU
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
| | - Jiansheng LIN
- Institute of Animal Husbandry and Veterinary Medicine,
Fujian Academy of Agricultural Sciences, Fujian Animal Diseases Control Technology Center,
Fujian Provincial Key Laboratory for Avian Diseases Control and Prevention, Fuzhou 350013,
China
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Jean A, Tardy F, Allatif O, Grosjean I, Blanquier B, Gerlier D. Assessing mycoplasma contamination of cell cultures by qPCR using a set of universal primer pairs targeting a 1.5 kb fragment of 16S rRNA genes. PLoS One 2017; 12:e0172358. [PMID: 28225826 PMCID: PMC5321415 DOI: 10.1371/journal.pone.0172358] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 02/04/2017] [Indexed: 11/24/2022] Open
Abstract
Mycoplasmas (a generic name for Mollicutes) are a predominant bacterial contaminant of cell culture and cell derived products including viruses. This prokaryote class is characterized by very small size and lack of a cell wall. Consequently, mycoplasmas escape ultrafiltration and visualization under routine microscopic examination, hence the ease with which cells in culture can be contaminated, with routinely more than 10% of cell lines being contaminated. Mycoplasma are a formidable threat both in fundamental research by perverting a whole range of cell properties and functions and in the pharmacological use of cells and cell derived products. Although many methods have been developed, there is still a need for a sensitive, universal assay. Here is reported the development and validation of a quantitative polymerase chain reaction (qPCR) based on the amplification of a 1.5 kb fragment covering the 16S rDNA of the Mollicute class by real-time PCR using universal U1 and U8 degenerate primers. The method includes the addition of a DNA loading probe to each sample to monitor DNA extraction and the absence of PCR inhibitors in the extracted DNA, a positive mycoplasma 16S rDNA traceable reference sample to exclude any accidental contamination of an unknown sample with this reference DNA, an analysis procedure based on the examination of the melting curve and the size of the PCR amplicon, followed by quantification of the number of 16S rDNA copies (with a lower limit of 19 copies) when relevant, and, if useful, the identification of the contaminating prokaryote by sequencing. The method was validated on a collection of mycoplasma strains and by testing over 100 samples of unknown contamination status including stocks of viruses requiring biosafety level 2, 3 or 4 containments. When compared to four established methods, the m16S_qPCR technique exhibits the highest sensitivity in detecting mycoplasma contamination.
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Affiliation(s)
- Audrey Jean
- Univ Lyon, SFR BioSciences, ENS de Lyon, Inserm US8, CNRS UMS344, UCBL, Lyon, France
| | - Florence Tardy
- ANSES, Agence Nationale de Sécurité Sanitaire de l’Alimentation, de l’Environnement et du Travail, VetAgro Sup, Univ Lyon, UMR Mycoplasmoses des Ruminants, Marcy l'Etoile, France
| | - Omran Allatif
- CIRI, International Center for Infectiology Research, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
| | - Isabelle Grosjean
- Univ Lyon, SFR BioSciences, ENS de Lyon, Inserm US8, CNRS UMS344, UCBL, Lyon, France
| | - Bariza Blanquier
- Univ Lyon, SFR BioSciences, ENS de Lyon, Inserm US8, CNRS UMS344, UCBL, Lyon, France
| | - Denis Gerlier
- Univ Lyon, SFR BioSciences, ENS de Lyon, Inserm US8, CNRS UMS344, UCBL, Lyon, France
- CIRI, International Center for Infectiology Research, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Univ Lyon, Lyon, France
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10
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World Health Organization International Standard To Harmonize Assays for Detection of Mycoplasma DNA. Appl Environ Microbiol 2015; 81:5694-702. [PMID: 26070671 DOI: 10.1128/aem.01150-15] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 06/03/2015] [Indexed: 11/20/2022] Open
Abstract
Nucleic acid amplification technique (NAT)-based assays (referred to here as NAT assays) are increasingly used as an alternative to culture-based approaches for the detection of mycoplasma contamination of cell cultures. Assay features, like the limit of detection or quantification, vary widely between different mycoplasma NAT assays. Biological reference materials may be useful for harmonization of mycoplasma NAT assays. An international feasibility study included lyophilized preparations of four distantly related mycoplasma species (Acholeplasma laidlawii, Mycoplasma fermentans, M. orale, M. pneumoniae) at different concentrations which were analyzed by 21 laboratories using 26 NAT assays with a qualitative, semiquantitative, or quantitative design. An M. fermentans preparation was shown to decrease the interassay variation when used as a common reference material. The preparation was remanufactured and characterized in a comparability study, and its potency (in NAT-detectable units) across different NATs was determined. The World Health Organization (WHO) Expert Committee on Biological Standardization (ECBS) established this preparation to be the "1st World Health Organization international standard for mycoplasma DNA for nucleic acid amplification technique-based assays designed for generic mycoplasma detection" (WHO Tech Rep Ser 987:42, 2014) with a potency of 200,000 IU/ml. This WHO international standard is now available as a reference preparation for characterization of NAT assays, e.g., for determination of analytic sensitivity, for calibration of quantitative assays in a common unitage, and for defining regulatory requirements in the field of mycoplasma testing.
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Molla Kazemiha V, Amanzadeh A, Memarnejadian A, Azari S, Shokrgozar MA, Mahdian R, Bonakdar S. Sensitivity of biochemical test in comparison with other methods for the detection of mycoplasma contamination in human and animal cell lines stored in the National Cell Bank of Iran. Cytotechnology 2014; 66:861-73. [PMID: 24493067 PMCID: PMC4158010 DOI: 10.1007/s10616-013-9640-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 08/28/2013] [Indexed: 01/25/2023] Open
Abstract
Mycoplasma contamination in cell culture is considered as serious problem in the manufacturing of biological products. Our goal in this research is to find the best standard and rapid method with high sensitivity, specificity, accuracy and predictive values of positive and negative results for detection of mycoplasma contamination in cell cultures of the National Cell Bank of Iran. In this study, 40 cell lines suspected to mycoplasma contamination were evaluated by three different methods: microbial culture, enzymatic mycoalert(®) and molecular. Enzymatic evaluation was performed using the mycoalert(®) kit while in the molecular technique, a universal primer pair was designed based on the common and fixed 16SrRNA ribosomal sequences used. Mycoplasma contaminations in cell cultures with molecular, enzymatic and microbial culture methods were determined as 57.5, 52.5 and 40 %, respectively. These results confirmed the higher rate of sensitivity, specificity and accuracy for the molecular method in comparison with enzymatic and microbial methods. Polymerase chain reaction (PCR) assay based on fixed and common sequences in the 16SrRNA, is a useful valuable and reliable technique with high sensitivity, specificity and accuracy for detection of mycoplasma contamination in cell cultures and other biological products. The enzymatic mycoalert(®) method can be considered as a substitution for conventional microbial culture and DNA staining fluorochrome methods due to its higher sensitivity, specificity and speed of detection (<20 min).
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Affiliation(s)
| | - Amir Amanzadeh
- />National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran
| | | | - Shahram Azari
- />National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran
| | | | - Reza Mahdian
- />Molecular Medicine Group, Department of Biotechnology, Pasteur Institute of Iran, Tehran, Iran
| | - Shahin Bonakdar
- />National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran
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Aarthi P, Bagyalakshmi R, Therese KL, Madhavan HN. Development of a novel reverse transcriptase polymerase chain reaction to determine the Gram reaction and viability of bacteria in clinical specimens. Microbiol Res 2013; 168:497-503. [PMID: 23602123 DOI: 10.1016/j.micres.2013.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 03/15/2013] [Accepted: 03/17/2013] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To develop a novel RNA based assay to determine the Gram reaction and viability of bacteria in clinical specimens. MATERIALS AND METHODS Reverse transcriptase PCR (RT-PCR) targeting 16SrRNA region was optimized using Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853 by using two novel sets of primers. Sixty clinical specimens consisting of 31 intraocular specimens (19 vitreous fluids and 12 aqueous humor), 11 peripheral blood specimens and 18 other clinical specimens were subjected to standard microbiological culture and RT-PCR to determine the Gram reaction and viability of bacteria. The amplified products were subjected to DNA sequencing to identify the bacterium. RESULTS The sensitivity of RT-PCR was 0.4fg and the primers amplified bacterial cDNA. RT-PCR detected the presence of bacteria in 60 clinical specimens indicating the presence of viable bacteria. Concordant results were obtained with both primer sets. Seventy five bacterium comprising 52 single (69.3%) and 23 mixed bacteria (30.6%), both Gram positive and Gram negative were detected. These results correlated with the bacterial identity by PCR based DNA sequencing. CONCLUSION RT-PCR is a reliable tool to identify the presence of viable bacteria and to precisely determine Gram reaction.
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Affiliation(s)
- P Aarthi
- Larsen and Toubro Microbiology Research Centre, Kamal Nayan Bajaj Research Centre, Vision Research Foundation, No. 41, College Road, Chennai 600006, India
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Volokhov DV, Graham LJ, Brorson KA, Chizhikov VE. Mycoplasma testing of cell substrates and biologics: Review of alternative non-microbiological techniques. Mol Cell Probes 2011; 25:69-77. [DOI: 10.1016/j.mcp.2011.01.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 12/22/2010] [Accepted: 01/04/2011] [Indexed: 11/25/2022]
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