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Remesh AT, Alagarasu K, Jadhav S, Prabhakar M, Viswanathan R. Pertussis Vaccines Scarcely Provide Protection against Bordetella parapertussis Infection in Children-A Systematic Review and Meta-Analysis. Vaccines (Basel) 2024; 12:253. [PMID: 38543887 PMCID: PMC10974608 DOI: 10.3390/vaccines12030253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/12/2024] [Accepted: 01/16/2024] [Indexed: 04/01/2024] Open
Abstract
BACKGROUND Pertussis, or whooping cough, is a global public health concern. Pertussis vaccines have demonstrated good protection against Bordetella pertussis infections, but their effectiveness against Bordetella parapertussis remains debated due to conflicting study outcomes. METHODS A systematic review and meta-analysis were conducted to assess the effectiveness of pertussis vaccines in protecting children against B. parapertussis infection. A comprehensive search of PubMed, Web of Science, and Scopus databases was conducted, and randomized controlled trials (RCTs) and observational studies that met inclusion criteria were included in the analysis. RESULTS The meta-analysis, involving 46,533 participants, revealed no significant protective effect of pertussis vaccination against B. parapertussis infection (risk ratio: 1.10, 95% confidence interval: 0.83 to 1.44). Subgroup analyses by vaccine type and study design revealed no significant protection. The dearth of recent data and a limited pool of eligible studies, particularly RCTs, underscore a critical gap that warrants future research in the domain. CONCLUSIONS These findings offer crucial insights into the lack of effectiveness of pertussis vaccines against B. parapertussis. Given the rising incidence of cases and outbreaks, coupled with the lack of cross-protection by the existing vaccines, there is an urgent need to develop vaccines that include specific antigens to protect against B. parapertussis.
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Affiliation(s)
| | - Kalichamy Alagarasu
- Dengue-Chikungunya Group, ICMR-National Institute of Virology, Pune 411001, India;
| | - Santoshkumar Jadhav
- Bioinformatics & Data Management Group, ICMR-National Institute of Virology, Pune 411001, India;
| | - Meera Prabhakar
- Bacteriology Group, ICMR-National Institute of Virology, Pune 411021, India; (A.T.R.); (M.P.)
| | - Rajlakshmi Viswanathan
- Bacteriology Group, ICMR-National Institute of Virology, Pune 411021, India; (A.T.R.); (M.P.)
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Safarchi A, Saedi S, Tay CY, Lamichhane B, Nakhost Lotfi M, Shahcheraghi F. Genome Characteristic of Bordetella parapertussis Isolated from Iran. Curr Microbiol 2022; 79:314. [PMID: 36088519 PMCID: PMC9464130 DOI: 10.1007/s00284-022-03009-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 08/23/2022] [Indexed: 11/28/2022]
Abstract
AbstractPertussis also known as whooping cough is a respiratory infection in humans particularly with severe symptoms in infants and usually caused by Bordetella pertussis. However, Bordetella parapertussis can also cause a similar clinical syndrome. During 2012 to 2015, from nasal swabs sent from different provinces to the pertussis reference laboratory of Pasture Institute of Iran for pertussis confirmation, seven B. parapertussis isolates were identified by bacterial culture, biochemical tests, and the presence of IS1001 insertion in the genome. The expression of pertactin (Prn) as one the major virulence factor for bacterial adhesion was investigated using western blot. Moreover, the genomic characteristic of one recently collected isolate, IRBP134, from a seven-month infant was investigated using Illumina NextSeq sequencing protocol. The results revealed the genome with G+C content 65% and genome size 4.7 Mbp. A total of 81 single nucleotide polymorphisms and 13 short insertions and deletions were found in the genome compared to the B. parapertussis 12822 as a reference genome showing ongoing evolutionary changes. A phylogeny relationship of IRBP134 was also investigated using global B. parapertussis available genomes.
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Affiliation(s)
- Azadeh Safarchi
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052 Australia
- Department of Bacteriology, Pasteur Institute of Iran, Tehran, 1316943551 Islamic Republic of Iran
| | - Samaneh Saedi
- Department of Bacteriology, Pasteur Institute of Iran, Tehran, 1316943551 Islamic Republic of Iran
| | - Chin Yen Tay
- The Marshal Centre for Infectious Disease Research and Training, University of Western Australia, Perth, WA 6009 Australia
| | - Binit Lamichhane
- The Marshal Centre for Infectious Disease Research and Training, University of Western Australia, Perth, WA 6009 Australia
| | - Masoumeh Nakhost Lotfi
- Department of Bacteriology, Pasteur Institute of Iran, Tehran, 1316943551 Islamic Republic of Iran
| | - Fereshteh Shahcheraghi
- Department of Bacteriology, Pasteur Institute of Iran, Tehran, 1316943551 Islamic Republic of Iran
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Multicenter Performance Evaluation of the Simplexa Bordetella Direct Kit in Nasopharyngeal Swab Specimens. J Clin Microbiol 2020; 59:JCM.01041-20. [PMID: 33055187 DOI: 10.1128/jcm.01041-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 10/07/2020] [Indexed: 11/20/2022] Open
Abstract
Detection of Bordetella pertussis and Bordetella parapertussis using molecular methods is sensitive and specific with a short turnaround time compared to other diagnostic methods. In this multicenter study, we compared the performance of the Simplexa Bordetella Direct kit to those of other molecular assays in detecting and differentiating B. pertussis and B. parapertussis in nasopharyngeal swab specimens. The limits of detection (LODs) were 150 CFU/ml or 3 fg/μl of DNA for B. pertussis and 1,500 CFU/ml or 10 fg/μl of DNA for B. parapertussis A total of 1,103 fresh and residual frozen specimens from eight clinical sites were tested. Combining the data from individual clinical sites using different comparative assays, the overall positive percent agreement (PPA) and negative percent agreement (NPA) for B. pertussis were 98.7% and 97.3%, respectively. The overall PPA and NPA for B. parapertussis were 96.7% and 100%, respectively. For prospective fresh specimens, the overall PPA and NPA for both targets were 97.7% and 99.3%, respectively. For retrospective frozen specimens, the overall PPA and NPA for both targets were 92.6% and 93.2%, respectively. The percentage of invalid results was 1.0%. A cross-reactivity study using 74 non-Bordetella bacterial species and five yeast species revealed that the Simplexa Bordetella Direct kit was 100% specific. The hands-on time and assay run time of the Simplexa Bordetella Direct kit are favorable compared to those of other commercial and laboratory-developed tests. In summary, the Simplexa Bordetella Direct kit has a performance comparable to those of other molecular assays for the detection of B. pertussis and B. parapertussis.
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Bayram J, Malcova I, Sinkovec L, Holubova J, Streparola G, Jurnecka D, Kucera J, Sedlacek R, Sebo P, Kamanova J. Cytotoxicity of the effector protein BteA was attenuated in Bordetella pertussis by insertion of an alanine residue. PLoS Pathog 2020; 16:e1008512. [PMID: 32776984 PMCID: PMC7446853 DOI: 10.1371/journal.ppat.1008512] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 08/20/2020] [Accepted: 06/24/2020] [Indexed: 11/30/2022] Open
Abstract
Bordetella bronchiseptica and Bordetella pertussis are closely related respiratory pathogens that evolved from a common bacterial ancestor. While B. bronchiseptica has an environmental reservoir and mostly establishes chronic infections in a broad range of mammals, B. pertussis is a human-specific pathogen causing acute pulmonary pertussis in infants and whooping cough illness in older humans. Both species employ a type III secretion system (T3SS) to inject a cytotoxic BteA effector protein into host cells. However, compared to the high BteA-mediated cytotoxicity of B. bronchiseptica, the cytotoxicity induced by B. pertussis BteA (Bp BteA) appears to be quite low and this has been attributed to the reduced T3SS gene expression in B. pertussis. We show that the presence of an alanine residue inserted at position 503 (A503) of Bp BteA accounts for its strongly attenuated cytotoxic potency. The deletion of A503 from Bp BteA greatly enhanced the cytotoxic activity of B. pertussis B1917 on mammalian HeLa cells and expression of Bp BteAΔA503 was highly toxic to Saccharomyces cerevisiae cells. Vice versa, insertion of A503 into B. bronchiseptica BteA (Bb BteA) strongly decreased its cytotoxicity to yeast and HeLa cells. Moreover, the production of Bp BteAΔA503 increased virulence of B. pertussis B1917 in the mouse model of intranasal infection (reduced LD50) but yielded less inflammatory pathology in infected mouse lungs at sublethal infectious doses. This suggests that A503 insertion in the T3SS effector Bp BteA may represent an evolutionary adaptation that fine-tunes B. pertussis virulence and host immune response. Pertussis remains the least-controlled vaccine-preventable infectious disease and the mechanisms by which Bordetella pertussis subverts defense mechanisms of human airway mucosa remain poorly understood. We found that B. pertussis had the cytotoxic activity of its type III secretion system-delivered effector BteA strongly attenuated by insertion of an alanine residue at position 503 as compared to the BteA homologue of the animal pathogen B. bronchiseptica. This functional adaptation reduced the capacity of B. pertussis to suppress host inflammatory response and may contribute to an acute course of the pulmonary form of human infant pertussis.
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Affiliation(s)
- Jan Bayram
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Ivana Malcova
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Larisa Sinkovec
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jana Holubova
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Gaia Streparola
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Vestec, Czech Republic
| | - David Jurnecka
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jan Kucera
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Vestec, Czech Republic
| | - Radislav Sedlacek
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, Vestec, Czech Republic
| | - Peter Sebo
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jana Kamanova
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
- * E-mail:
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Kamachi K, Otsuka N, Fumimoto R, Ozawa K, Yao SM, Chiang CS, Luu LDW, Lan R, Shibayama K, Watanabe M. A novel multilocus variable-number tandem repeat analysis for Bordetella parapertussis. J Med Microbiol 2019; 68:1671-1676. [PMID: 31613204 DOI: 10.1099/jmm.0.001095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Purpose. Human-adapted Bordetella parapertussis is one of the causative agents of whooping cough; however, there are currently no genotyping systems with high discriminatory power for this bacterial pathogen. We therefore aimed to develop a multilocus variable-number tandem repeat analysis (MLVA) for human-adapted B. parapertussis.Methodology. Four highly polymorphic variable number tandem repeat (VNTR) loci in the B. parapertussis genome were selected and amplified by multiplex PCR. MLVA was performed based on the number of tandem repeats at VNTR loci. The discriminatory power of MLVA was evaluated with three laboratory reference strains and 50 human isolates of B. parapertussis.Results. Multiplex PCR-based MLVA characterized 53 B. parapertussis reference strains and isolates into 25 MLVA types and the Simpson diversity index was 0.91 (95 % confidence interval, 0.86-0.97). The three reference strains exhibited different MLVA types. Thirty-one Japanese isolates, ten French isolates and three Taiwanese isolates belonged to fourteen, nine and three MLVA types, respectively. In contrast, all five Australian isolates belonged to the same type. Two Japanese isolates collected from patients with known epidemiological links had the same type.Conclusion. Our novel MLVA method has high discriminatory power for genotyping human B. parapertussis. Regarding this organism, this genotyping system is a promising tool for epidemiological surveillance and investigating outbreaks.
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Affiliation(s)
- Kazunari Kamachi
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Nao Otsuka
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Rei Fumimoto
- Department of Pediatrics, St Marianna University School of Medicine, Kawasaki, Japan.,Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Kensuke Ozawa
- R & D Center for Diagnostic Reagents, Denka Seiken, Niigata, Japan
| | - Shu-Man Yao
- Center for Diagnostics and Vaccine Development, Centers for Disease Control, Taipei, Taiwan, ROC
| | - Chuen-Sheue Chiang
- Center for Diagnostics and Vaccine Development, Centers for Disease Control, Taipei, Taiwan, ROC
| | - Laurence Don Wai Luu
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, Australia
| | - Ruiting Lan
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, Australia
| | - Keigo Shibayama
- Department of Bacteriology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Mineo Watanabe
- Present address: Division of Microbiology and Molecular Cell Biology, Nihon Pharmaceutical University, Saitama, Japan.,Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan
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Wi CI, Wheeler PH, Kaur H, Ryu E, Kim D, Juhn Y. Spatio-temporal comparison of pertussis outbreaks in Olmsted County, Minnesota, 2004-2005 and 2012: a population-based study. BMJ Open 2019; 9:e025521. [PMID: 31110089 PMCID: PMC6530371 DOI: 10.1136/bmjopen-2018-025521] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVE Two pertussis outbreaks occurred in Olmsted County, Minnesota, during 2004-2005 and 2012 (5-10 times higher than other years), with significantly higher incidence than for the State. We aimed to assess whether there were similar spatio-temporal patterns between the two outbreaks. SETTING Olmsted County, Minnesota, USA PARTICIPANTS: We conducted a population-based retrospective cohort study of all Olmsted County residents during the 2004-2005 and 2012 outbreaks, including laboratory-positive pertussis cases. PRIMARY OUTCOME MEASURE For each outbreak, we estimated (1) age-specific incidence rate using laboratory-positive pertussis cases (numerator) and the Rochester Epidemiology Project Census (denominator), a medical record-linkage system for virtually all Olmsted County residents, and (2) pertussis case density using kernel density estimation to identify areas with high case density. To account for population size, we calculated relative difference of observed density and expected density based on age-specific incidence. RESULTS We identified 157 and 195 geocoded cases in 2004-2005 and 2012, respectively. Incidence was the highest among adolescents (ages 11 to <14 years) for both outbreaks (9.6 and 7.9 per 1000). The 2004-2005 pertussis outbreak had higher incidence in winter (52% of cases) versus summer in 2012 (53%). We identified a consistent area with higher incidence at the beginning (ie, first quartile) of two outbreaks, but it was inconsistent for later quartiles. The relative difference maps for the two outbreaks suggest a greater role of neighbourhood population size in 2012 compared with 2004-2005. CONCLUSIONS Comparing spatio-temporal patterns between two pertussis outbreaks identified a consistent geographical area with higher incidence of pertussis at the beginning of outbreaks in this community. This finding can be tested in future outbreaks, and, if confirmed, can be used for identifying epidemiological risk factors clustered in such areas for geographically targeted intervention.
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Affiliation(s)
- Chung-Il Wi
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Philip H Wheeler
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Harsheen Kaur
- Department of Pediatrics, Univeristy of New Mexico, Albuquerque, New Mexico, USA
| | - Euijung Ryu
- Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota, USA
| | - Dohyeong Kim
- Geospatial Health Research Group, School of Economic, Political and Policy Sciences, University of Texas at Dallas, Richardson, Texas, USA
| | - Young Juhn
- Department of Community Pediatrics and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
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Zhang Y, Chen Z, Zhao J, Zhang N, Chen N, Zhang J, Li S, He Q. Increased susceptibility to pertussis in adults at childbearing age as determined by comparative seroprevalence study, China 2010-2016. J Infect 2019; 79:1-6. [PMID: 31009653 DOI: 10.1016/j.jinf.2019.04.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 03/24/2019] [Accepted: 04/16/2019] [Indexed: 11/30/2022]
Abstract
OBJECTIVES This study was aimed to determine pertussis specific serum PT-IgG antibodies in healthy individuals during 2010 and 2015/2016 in Beijing, China. METHODS A total of 3884 healthy individuals were included: 3058 aged 3-69 years randomly selected from an epidemiological survey conducted in 2010, and 826 aged 20-39 years selected from those who attended an annual medical examination in 2015/2016. Serum PT-IgG antibodies were determined using the Serion/Virion ELISA kits. RESULTS Of 3058 subjects in 2010, 167 (5.5%) and 39 (1.3%) subjects had PT-IgG antibodies ≥40 IU/ml and ≥100 IU/ml, respectively. No differences were observed among different age groups. Altogether, 26.2% had undetectable PT-IgG antibodies (<5 IU/ml), and the highest undetectable rate of 56.8% was found in children aged 3-5 years. When the age group of 20-39 years was compared between the two periods, no difference was found in seroprevalence of PT-IgG antibodies ≥ 40 IU/ml (5.1% vs. 4.0%). However, an undetectable rate of PT-IgG antibodies was significantly higher in 2015/2016 than that in 2010 (57.4% vs. 29.1%, p < 0.001). CONCLUSIONS Our results showed that about 5% of individuals had PT-IgG antibodies indicative of a recent infection, and adults at childbearing age have an increased risk to pertussis in China.
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Affiliation(s)
- Yuxiao Zhang
- Department of Medical Microbiology, Capital Medical University, Beijing, China
| | - Zhiyun Chen
- Department of Medical Microbiology, Capital Medical University, Beijing, China
| | - Jianhong Zhao
- Center for Disease Prevention and Control, Chaoyang District, Beijing, China
| | - Nan Zhang
- Department of Medical Microbiology, Capital Medical University, Beijing, China
| | - Ning Chen
- Department of Medical Microbiology, Capital Medical University, Beijing, China
| | - Jing Zhang
- Beijing You'an Hospital, Capital Medical University, Beijing, China
| | - Shuming Li
- Center for Disease Prevention and Control, Chaoyang District, Beijing, China
| | - Qiushui He
- Department of Medical Microbiology, Capital Medical University, Beijing, China; Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland.
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Alvarez Hayes J, Oviedo JM, Valdez H, Laborde JM, Maschi F, Ayala M, Shah R, Fernandez Lahore M, Rodriguez ME. A recombinant iron transport protein from Bordetella pertussis confers protection against Bordetella parapertussis. Microbiol Immunol 2017; 61:407-415. [PMID: 28857261 DOI: 10.1111/1348-0421.12532] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 08/14/2017] [Accepted: 08/24/2017] [Indexed: 12/20/2022]
Abstract
Whooping cough, which is caused by Bordetella pertussis and B. parapertussis, is a reemerging disease. New protective antigens are needed to improve the efficacy of current vaccines against both species. Using proteomic tools, it was here found that B. parapertussis expresses a homolog of AfuA, a previously reported new vaccine candidate against B. pertussis. It was found that this homolog, named AfuABpp , is expressed during B. parapertussis infection, exposed on the surface of the bacteria and recognized by specific antibodies induced by the recombinant AfuA cloned from B. pertussis (rAfuA). Importantly, the presence of the O-antigen, a molecule that has been found to shield surface antigens on B. parapertussis, showed no influence on antibody recognition of AfuABpp on the bacterial surface. The present study further showed that antibodies induced by immunization with the recombinant protein were able to opsonize B. parapertussis and promote bacterial uptake by neutrophils. Finally, it was shown that this antigen confers protection against B. parapertussis infection in a mouse model. Altogether, these results indicate that AfuA is a good vaccine candidate for acellular vaccines protective against both causative agents of whooping cough.
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Affiliation(s)
- Jimena Alvarez Hayes
- CINDEFI (UNLP CONICET La Plata), School of Sciences, University of La Plata, La Plata, Argentina
| | - Juan Marcos Oviedo
- CINDEFI (UNLP CONICET La Plata), School of Sciences, University of La Plata, La Plata, Argentina
| | - Hugo Valdez
- CINDEFI (UNLP CONICET La Plata), School of Sciences, University of La Plata, La Plata, Argentina
| | - Juan Martín Laborde
- Laboratory of Experimental Animals. School of Veterinary Sciences, University of La Plata, La Plata, Argentina
| | - Fabricio Maschi
- Laboratory of Experimental Animals. School of Veterinary Sciences, University of La Plata, La Plata, Argentina
| | - Miguel Ayala
- Laboratory of Experimental Animals. School of Veterinary Sciences, University of La Plata, La Plata, Argentina
| | - Rohan Shah
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Marcelo Fernandez Lahore
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Maria Eugenia Rodriguez
- CINDEFI (UNLP CONICET La Plata), School of Sciences, University of La Plata, La Plata, Argentina
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Guiso N. Bordetella Adenylate Cyclase-Hemolysin Toxins. Toxins (Basel) 2017; 9:E277. [PMID: 28892012 PMCID: PMC5618210 DOI: 10.3390/toxins9090277] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 09/03/2017] [Accepted: 09/07/2017] [Indexed: 01/04/2023] Open
Abstract
Adenylate cyclase-hemolysin toxin is secreted and produced by three classical species of the genus Bordetella: Bordetella pertussis, B. parapertussis and B. bronchiseptica. This toxin has several properties such as: (i) adenylate cyclase activity, enhanced after interaction with the eukaryotic protein, calmodulin; (ii) a pore-forming activity; (iii) an invasive activity. It plays an important role in the pathogenesis of these Bordetella species responsible for whooping cough in humans or persistent respiratory infections in mammals, by modulating host immune responses. In contrast with other Bordetella toxins or adhesins, lack of (or very low polymorphism) is observed in the structural gene encoding this toxin, supporting its importance as well as a potential role as a vaccine antigen against whooping cough. In this article, an overview of the investigations undertaken on this toxin is presented.
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Affiliation(s)
- Nicole Guiso
- Institut Pasteur Unité de Prévention et Thérapies Moléculaires des Maladies Humaines, 25 rue du Dr. Roux, 75015 Paris, France.
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