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González E, Reyes F, Otero O, Camacho F, Cuello M, Ramírez F, Acevedo R. Monoclonal Antibodies Against the Capsular Polysaccharides A, C, Y, W, and X of Neisseria meningitidis: A Platform for the Quality Control of Meningococcal Vaccines. Methods Mol Biol 2019; 1969:181-203. [PMID: 30877678 DOI: 10.1007/978-1-4939-9202-7_13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Vaccination has reduced morbidity and mortality of many diseases that previously caused devastating epidemics and deaths globally. Vaccines as a biological product may contain microorganisms or their derivatives. This aspect together with the fact that they are administered to healthy individuals (mainly children) means that approximately 70% of vaccines development time is dedicated to quality control. Monoclonal antibodies (MAbs) have become essential analytical tools for application in ELISAs, Western and Dot blotting, immunoprecipitation, and flow cytometric assays that ensure the quality control of vaccines. The aim of this work is to present a review of the methods used to obtain a platform of MAbs against Neisseria meningitidis polysaccharide antigens to use as an analytical tool for quality control of anti-meningococcal polysaccharide (Ps) vaccines. The MAbs obtained are used in five sandwich ELISAs developed for Ps quantification. The assays showed good reproducibility and repeatability, with quantitation and detection limits below 1 ng/mL. Dot Blot, as the Identity test of the Ps vaccine, was carried out to positively identify licensed and experimental vaccines. All assays described are suitable for the screening of multiple vaccine samples and could be useful for monitoring lot-to-lot consistency and stability.
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Affiliation(s)
- Elizabeth González
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba
| | - Fátima Reyes
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba
| | - Oscar Otero
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba
| | - Frank Camacho
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba
| | - Maribel Cuello
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba
| | - Fidel Ramírez
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba
| | - Reinaldo Acevedo
- Monoclonal Antibodies Laboratory, Department of Biological Evaluation, Research Area, Finlay Institute of Vaccine, West Havana, Cuba.
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2
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Loschko J, Garcia K, Cooper D, Pride M, Anderson A. Flow Cytometric Assays to Quantify fHbp Expression and Detect Serotype Specific Capsular Polysaccharides on Neisseria meningitidis. Methods Mol Biol 2019; 1969:217-236. [PMID: 30877680 DOI: 10.1007/978-1-4939-9202-7_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Flow cytometry provides an automated analysis of bacteria passing in fluid suspension through a laser light beam. Bacteria are first treated with antibodies that bind to a specific target. These antibodies are tagged to fluorophores that fluoresce when passed through a laser beam. As the bacteria pass sequentially through the laser beam, they absorb and scatter the light in forward and side (90°) angles. The forward angle scatter is proportional to the size of the bacteria and the 90° angle side scatter is proportional to the internal structure (granularity). In addition, the tagged antibodies bound specifically to each bacteria, emit fluorescent light at defined wavelengths that can be collected and measured.Here we describe two flow cytometry based assays to measure expression levels of protein and polysaccharide on the surface of Neisseria meningitidis.
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Affiliation(s)
- Jakob Loschko
- Pfizer Vaccine Research and Development, Pearl River, NY, USA.
| | - Karen Garcia
- Pfizer Vaccine Research and Development, Pearl River, NY, USA
| | - David Cooper
- Pfizer Vaccine Research and Development, Pearl River, NY, USA
| | - Michael Pride
- Pfizer Vaccine Research and Development, Pearl River, NY, USA
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Kenyon JJ, Cunneen MM, Reeves PR. Genetics and evolution of Yersinia pseudotuberculosis O-specific polysaccharides: a novel pattern of O-antigen diversity. FEMS Microbiol Rev 2017; 41:200-217. [PMID: 28364730 PMCID: PMC5399914 DOI: 10.1093/femsre/fux002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 02/02/2017] [Indexed: 11/29/2022] Open
Abstract
O-antigen polysaccharide is a major immunogenic feature of the lipopolysaccharide of Gram-negative bacteria, and most species produce a large variety of forms that differ substantially from one another. There are 18 known O-antigen forms in the Yersinia pseudotuberculosis complex, which are typical in being composed of multiple copies of a short oligosaccharide called an O unit. The O-antigen gene clusters are located between the hemH and gsk genes, and are atypical as 15 of them are closely related, each having one of five downstream gene modules for alternative main-chain synthesis, and one of seven upstream modules for alternative side-branch sugar synthesis. As a result, many of the genes are in more than one gene cluster. The gene order in each module is such that, in general, the earlier a gene product functions in O-unit synthesis, the closer the gene is to the 5΄ end for side-branch modules or the 3΄ end for main-chain modules. We propose a model whereby natural selection could generate the observed pattern in gene order, a pattern that has also been observed in other species.
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Affiliation(s)
- Johanna J. Kenyon
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
- Institute of Health and Biomedical Innovation, Queensland University of Technology. Brisbane, QLD 4001, Australia
| | - Monica M. Cunneen
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
| | - Peter R. Reeves
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006, Australia
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4
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Cuzzi B, Herasimenka Y, Silipo A, Lanzetta R, Liut G, Rizzo R, Cescutti P. Versatility of the Burkholderia cepacia complex for the biosynthesis of exopolysaccharides: a comparative structural investigation. PLoS One 2014; 9:e94372. [PMID: 24722641 PMCID: PMC3983119 DOI: 10.1371/journal.pone.0094372] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 03/15/2014] [Indexed: 11/24/2022] Open
Abstract
The Burkholderia cepacia Complex assembles at least eighteen closely related species that are ubiquitous in nature. Some isolates show beneficial potential for biocontrol, bioremediation and plant growth promotion. On the contrary, other strains are pathogens for plants and immunocompromised individuals, like cystic fibrosis patients. In these subjects, they can cause respiratory tract infections sometimes characterised by fatal outcome. Most of the Burkholderia cepacia Complex species are mucoid when grown on a mannitol rich medium and they also form biofilms, two related characteristics, since polysaccharides are important component of biofilm matrices. Moreover, polysaccharides contribute to bacterial survival in a hostile environment by inhibiting both neutrophils chemotaxis and antimicrobial peptides activity, and by scavenging reactive oxygen species. The ability of these microorganisms to produce exopolysaccharides with different structures is testified by numerous articles in the literature. However, little is known about the type of polysaccharides produced in biofilms and their relationship with those obtained in non-biofilm conditions. The aim of this study was to define the type of exopolysaccharides produced by nine species of the Burkholderia cepacia Complex. Two isolates were then selected to compare the polysaccharides produced on agar plates with those formed in biofilms developed on cellulose membranes. The investigation was conducted using NMR spectroscopy, high performance size exclusion chromatography, and gas chromatography coupled to mass spectrometry. The results showed that the Complex is capable of producing a variety of exopolysaccharides, most often in mixture, and that the most common exopolysaccharide is always cepacian. In addition, two novel polysaccharide structures were determined: one composed of mannose and rhamnose and another containing galactose and glucuronic acid. Comparison of exopolysaccharides obtained from cultures on agar plates with those extracted from biofilms on cellulose membranes showed important differences, thus suggesting that extrapolating data from non-biofilm conditions might not always be applicable.
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Affiliation(s)
- Bruno Cuzzi
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Yury Herasimenka
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Alba Silipo
- Department of Chemical Sciences, University of Naples Federico II, Naples, Italy
| | - Rosa Lanzetta
- Department of Chemical Sciences, University of Naples Federico II, Naples, Italy
| | - Gianfranco Liut
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Roberto Rizzo
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Paola Cescutti
- Department of Life Sciences, University of Trieste, Trieste, Italy
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5
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Huang H, Liu Y, Liu R. [Sphingomonas sp.: an important microbial resource for biopolymer synthesis]. Wei Sheng Wu Xue Bao 2009; 49:560-566. [PMID: 19637560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The genus Sphingomonas was established in 1990. Sphingomonas spp. synthesize sphingans, structurally related biopolymers such as gellan, welan and diutan. At present, only gellan is applied widely in foods and pharmaceuticals. The economic value of other sphingans has not been well explored, and related research of sphingans still remains limited. In the present review, we address the latest taxonomy developments of Sphingomonas, details about structure, characteristics and biosynthetic pathway of sphingans, current knowledge on the molecular genetics and genetic engineering of sphingans. In addition, we indicate future research needs.
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Affiliation(s)
- Haidong Huang
- Key Laboratory of Molecular Microbiology Technology, Ministry of Education, College of Life Sciences, Nankai University, Tianjin 300071, China.
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Verdier I, Durand G, Bes M, Taylor KL, Lina G, Vandenesch F, Fattom AI, Etienne J. Identification of the capsular polysaccharides in Staphylococcus aureus clinical isolates by PCR and agglutination tests. J Clin Microbiol 2007; 45:725-9. [PMID: 17202275 PMCID: PMC1829147 DOI: 10.1128/jcm.01572-06] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Staphylococcus aureus is a major cause of nosocomial and community-acquired infections. The predominance of two capsular polysaccharides, types 5 and 8, on the surface of clinical isolates led to the development of a conjugate vaccine (StaphVAX) based on capsular polysaccharides types 5 and 8 conjugated to a carrier protein. We have studied the capsular phenotypes and genotypes of 195 isolates representative of all clinical syndromes that encompassed both hospital and community-acquired infections. These isolates were mainly detected in France between January 2001 and December 2004. In this population, most of clinical isolates (87%) expressed either capsular polysaccharide type 5 (42%) or 8 (45%), whereas 13% were nontypeable by the serotyping method with antibodies specific to capsular polysaccharide type 5 or 8. These 26 nontypeable strains were further serotyped and were demonstrated to express the cell wall surface antigen 336, a polyribitol phosphate N-acetylglucosamine, which resembles cell wall teichoic acid. Among methicillin-resistant Staphylococcus aureus (MRSA) strains, we found a predominance of serotype 5 for 64% of strains, whereas MSSA isolates were predominantly capsular serotype 8 (60%). All S. aureus clinical isolates included in the present study have been investigated by PCR method, demonstrating that all isolates carried either the cap5 or the cap8 locus.
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Karadenizli A, Kolayli F, Ergen K. A novel application of Fourier-transformed infrared spectroscopy: classification of slime from staphylococci. Biofouling 2007; 23:63-71. [PMID: 17453730 DOI: 10.1080/08927010601143524] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
It has been proposed that the virulence of nosocomial Staphylococcus infections associated with indwelling medical devices is related to the ability of the bacterium to colonise these materials by forming a biofilm composed of multilayered cell clusters embedded in a slime matrix. However, the pathogenic role of exopolysaccharide biofilms is not fully understood. A new method was sought for differentiating the structure of slime from two closely related bacterial strains, Staphylococcus aureus and Staphylococcus epidermidis. Using PCR it was confirmed that these strains were positive for the icaA and icaD genes and the complete ica operon (2.7 kb). Monosaccharide analysis by thin-layer chromatography revealed an identical profile for both strains, with xylose and glucose present among the four visible bands. Using Fourier-transformed infrared spectroscopy and hierarchical cluster analysis, three of four S. aureus samples (75%), and four of five S. epidermidis samples were grouped according to species. A novel FTIR approach in classifying slime produced by S. aureus and S. epidermidis is reported.
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Affiliation(s)
- Aynur Karadenizli
- Department of Microbiology, Faculty of Medicine, Kocaeli University, Izmit-Kocaeli, Turkey
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8
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Yoon KH, Cho JY. Transcriptional analysis of the gum gene cluster from Xanthomonas oryzae pathovar oryzae. Biotechnol Lett 2006; 29:95-103. [PMID: 17091379 DOI: 10.1007/s10529-006-9217-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2006] [Accepted: 09/19/2006] [Indexed: 10/23/2022]
Abstract
Genome sequence analysis of Xanthomonas oryzae pv. oryzae KACC10331 provides insight into the X. oryzae gum gene cluster that is composed of 14 open-reading frames (ORFs), designated gumB, -C, -D, -E, -F, -G, -H, -I, -J, -K, -L, -M, XOO3167, and -N. We analyzed the transcriptional linkage of the X. oryzae gum gene cluster by using RT-PCR. Analyses of the gum gene cluster by RT-PCR with the wild-type and mutant strains, which carried a deletion of the promoter-like region upstream of gumB or an insertion of the rrnB transcriptional terminator into the gumF gene, revealed that the ORFs of this gene cluster were transcribed as polycistronic mRNA, from gumB to gumN, and the secondary promoter was located upstream of gumG. Taken together, these results suggest that the genes of this cluster constitute an operon expressed from overlapping transcripts.
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Affiliation(s)
- Ki-Hoon Yoon
- Division of Animal Science and Biotechnology, Sangji University, Wonju-si, Gangwon-do, Korea
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9
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d'Empaire G, Baer MT, Gibson FC. The K1 serotype capsular polysaccharide of Porphyromonas gingivalis elicits chemokine production from murine macrophages that facilitates cell migration. Infect Immun 2006; 74:6236-43. [PMID: 16940143 PMCID: PMC1695525 DOI: 10.1128/iai.00519-06] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Porphyromonas gingivalis is the principal organism associated with aggressive forms of generalized periodontal disease. Previous reports have suggested that encapsulated P. gingivalis strains are more virulent than unencapsulated strains; however, the contribution of capsular polysaccharide (CPS) to the virulence of this organism is poorly understood. Since periodontal disease presents with a complex inflammatory cell lesion comprised of neutrophils and monocytes, we cultured murine peritoneal macrophages with heat-killed P. gingivalis W83, CPS purified from P. gingivalis strain W83, and the seven known serotype-specific P. gingivalis CPS and assessed the ability of supernatant fluids produced by challenged macrophages to attract naïve inflammatory cells. We also defined JE/MCP-1, KC, MIP-2, and RANTES production in response to the P. gingivalis CPS antigens. We observed that supernatant fluids collected from macrophages incubated with P. gingivalis W83 and serotype K1 CPS stimulated the migration of naïve murine bone marrow-derived polymorphonuclear leukocytes in an in vitro cell migration chamber. CPS from W83 and the K1 serotype elicited potent chemokine secretion patterns for macrophages, while those specific to serotypes K2 to K7 were significantly less stimulatory. Reverse transcription-PCR and enzyme-linked immunosorbent assay revealed JE/MCP-1, KC, MIP-2, and RANTES expression from murine macrophages which had been challenged with purified P. gingivalis W83 CPS. Chemokine production appeared to be dependent on both the dose of and time of exposure to P. gingivalis W83 CPS. These data demonstrate that the P. gingivalis serotype K1 CPS elicits chemokine production from phagocytic cells. Furthermore, these data suggest that the host response to this antigen may contribute to the formation of the inflammatory cell lesion observed during P. gingivalis-elicited periodontal disease.
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Affiliation(s)
- Gabriela d'Empaire
- Department of Oral Biology and Periodontology, Goldman School of Dental Medicine, Boston University Medical Center, MA 02118, USA
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Roghmann M, Taylor KL, Gupte A, Zhan M, Johnson JA, Cross A, Edelman R, Fattom AI. Epidemiology of capsular and surface polysaccharide in Staphylococcus aureus infections complicated by bacteraemia. J Hosp Infect 2005; 59:27-32. [PMID: 15571850 DOI: 10.1016/j.jhin.2004.07.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Accepted: 07/09/2004] [Indexed: 10/26/2022]
Abstract
Staphylococcus aureus is a leading cause of serious hospital- and community-acquired infections. The discovery of serologically distinct capsular polysaccharides on the surface of clinical isolates has allowed the development of vaccines and passive protective immunity. We have studied patient characteristics, infection characteristics and the surface and capsular polysaccharide serotype distribution in patients with S. aureus infections complicated by bacteraemia admitted to VA hospitals in Maryland between 1995 and 2000. Nine hundred and ninety-three blood cultures from 331 patients were positive for S. aureus. Thirty-eight percent of patients had diabetes, 11% had end-stage renal failure, and 23% were injection drug users. Forty-two percent of infections were caused by methicillin-resistant strains (MRSA), and 60% were acquired during hospitalization. Serotyping of the first available isolate per patient (N=234 isolates) using polyclonal antibodies showed three major phenotypes--42%, type 8 (T8) capsule; 50%, type 5 (T5) capsule; and 8%, 336 polysaccharide. MRSA isolates were significantly more likely to be T5 than methicillin-susceptible isolates (66% vs. 39%, P<0.001). The proportion of T5 MRSA increased significantly (years 1-2: 41%; years 3-4: 65%; years 5-6: 90%, P<0.001). This large sample of patients with serious S. aureus infection confirms that capsular polysaccharides T5 and T8 cause most human infections, and together with serotype 336, account for nearly all those with bacteraemia.
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Affiliation(s)
- M Roghmann
- Epidemiology Section, Medical Care Clinical Center, VA Maryland Health Care System, Baltimore, MD, USA.
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11
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Kang YS, Kim JY, Bruening SA, Pack M, Charalambous A, Pritsker A, Moran TM, Loeffler JM, Steinman RM, Park CG. The C-type lectin SIGN-R1 mediates uptake of the capsular polysaccharide of Streptococcus pneumoniae in the marginal zone of mouse spleen. Proc Natl Acad Sci U S A 2003; 101:215-20. [PMID: 14694198 PMCID: PMC314165 DOI: 10.1073/pnas.0307124101] [Citation(s) in RCA: 140] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
SIGN-R1, a recently discovered C-type lectin expressed at high levels on macrophages within the marginal zone of the spleen, mediates the uptake of dextran polysaccharides by these phagocytes. We now find that encapsulated Streptococcus pneumoniae are rapidly cleared by these macrophages from the bloodstream, and that capture also takes place when different cell lines express SIGN-R1 after transfection. To assess the role of the capsular polysaccharide of S. pneumoniae (CPS) in the interaction of SIGN-R1 with pneumococci, we first studied binding and uptake of serotype 14 CPS in transfected cells. Binding was observed and was of a much higher avidity (3000-fold) for CPS 14 than dextran. The CPSs from four different serotypes were also cleared by marginal zone macrophages in vivo. To establish a role for SIGN-R1 in this uptake, we selectively down-regulated expression of the lectin by pretreatment of the mice with SIGN-R1 antibodies, including a newly generated hamster monoclonal called 22D1. For several days after this transient knockout, the marginal zone macrophages were unable to take up either CPSs or dextrans. Therefore, marginal zone macrophages in mice have a receptor that interacts with capsular pneumococcal polysaccharides, setting the stage for further studies of the functional consequences of this interaction.
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Affiliation(s)
- Young-Sun Kang
- Laboratory of Cellular Physiology and Immunology and Chris Browne Center for Immunology and Immune Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA
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12
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Alcalá B, Arreaza L, Salcedo C, Uría MJ, De La Fuente L, Vázquez JA. Capsule switching among C:2b:P1.2,5 meningococcal epidemic strains after mass immunization campaign, Spain. Emerg Infect Dis 2002; 8:1512-4. [PMID: 12498676 PMCID: PMC2738524 DOI: 10.3201/eid0812.020081] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
A mass immunization campaign for 18-month to 19-year-olds was undertaken in Spain in 1996-1997 because of an epidemic of serogroup C meningococcal disease associated with a C:2b:P1.2,5 strain belonging to the A4 lineage. Surveillance for the "capsule-switching" phenomenon producing B:2b:P1.2,5 isolates was undertaken. Of 2,975 meningococci characterized, B:2b:P1.2,5 and B:2b:P1.2 antigenic combinations were found in 18 isolates; 15 meningococci were defined as serogroup B belonging to the A4 lineage.
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Affiliation(s)
- Belén Alcalá
- Centro Nacional de Microbiología-Instituto de Salud Carlos III, Madrid, Spain
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13
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Maira-Litrán T, Kropec A, Abeygunawardana C, Joyce J, Mark G, Goldmann DA, Pier GB. Immunochemical properties of the staphylococcal poly-N-acetylglucosamine surface polysaccharide. Infect Immun 2002; 70:4433-40. [PMID: 12117954 PMCID: PMC128161 DOI: 10.1128/iai.70.8.4433-4440.2002] [Citation(s) in RCA: 225] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Staphylococcus aureus and Staphylococcus epidermidis often elaborate adherent biofilms, which contain the capsular polysaccharide-adhesin (PS/A) that mediates the initial cell adherence to biomaterials. Biofilm cells produce another antigen, termed polysaccharide intercellular adhesin (PIA), which is composed of a approximately 28 kDa soluble linear beta(1-6)-linked N-acetylglucosamine. We developed a new method to purify PS/A from S. aureus MN8m, a strain hyperproducing PS/A. Using multiple analytical techniques, we determined that the chemical structure of PS/A is also beta(1-6)-N-acetylglucosamine (PNAG). We were unable to find N-succinylglucosamine residues in any of our preparations in contrast to previously reported findings (D. McKenney, K. Pouliot, Y. Wang, V. Murthy, M. Ulrich, G. Doring, J. C. Lee, D. A Goldmann, and G. B. Pier, Science 284:1523-1527, 1999). PNAG was produced with a wide range of molecular masses that could be divided into three major fractions with average molecular masses of 460 kDa (PNAG-I), 100 kDa (PNAG-II), and 21 kDa (PNAG-III). The purified antigens were not soluble at neutral pH unless first dissolved in 5 M HCl and then neutralized with 5 M NaOH. PNAG-I was very immunogenic in rabbits, but the responses of individual animals were variable. Immunization of mice with various doses (100, 50, or 10 microg) of PNAG-I, -II, and -III demonstrated that only PNAG-I was able to elicit an immunoglobulin G (IgG) immune response with the highest titers obtained with 100-microg dose. When we purified a small fraction of PNAG with a molecular mass of approximately 780 kDa (PNAG-780) from PNAG-I, significantly higher IgG titers than those in mice immunized with the same doses of PNAG-I were obtained, suggesting the importance of the molecular mass of PNAG in the antibody response. These results further clarify the chemical structure of PS/A and help to differentiate it from PIA on the basis of immunogenicity, molecular size, and solubility.
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Affiliation(s)
- Tomás Maira-Litrán
- Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
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14
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Marshall VM, Laws AP, Gu Y, Levander F, Rådström P, De Vuyst L, Degeest B, Vaningelgem F, Dunn H, Elvin M. Exopolysaccharide-producing strains of thermophilic lactic acid bacteria cluster into groups according to their EPS structure. Lett Appl Microbiol 2001; 32:433-7. [PMID: 11412358 DOI: 10.1046/j.1472-765x.2001.00937.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS To compare galactose-negative strains of Streptococcus thermophilus and Lactobacillus delbrueckii subspecies bulgaricus isolated from fermented milk products and known to produce exopolysaccharides (EPSs). METHODS AND RESULTS The structures of the EPSs were determined using nuclear magnetic resonance (NMR) and their genetic relationships determined using restriction endonuclease analysis (REA) and random amplification of polymorphic DNA (RAPD). Similar groupings were apparent by REA and RAPD, and each group produced an EPS with a particular subunit structure. CONCLUSION Although none of the strains assimilated galactose, all inserted a high proportion of galactose into their EPS when grown in skimmed milk, and fell into three distinct groups. SIGNIFICANCE AND IMPACT OF THE STUDY This information should help in an understanding of genetic exchanges in lactic acid bacteria.
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Affiliation(s)
- V M Marshall
- Centre for Biomolecular Sciences, University of Huddersfield, UK.
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Abstract
We studied the safety and immunogenicity in healthy adults of an 11-valent pneumococcal conjugate vaccine. Capsular polysaccharides (PS) of serotypes 1, 4, 5, 7F, 9V, 19F and 23F were conjugated to tetanus toxoid, and of serotypes 3, 6B, 14 and 18C to diphtheria toxoid. Ten subjects received the conjugate vaccine with and the other ten subjects without aluminium hydroxide adjuvant. The reference vaccine was a marketed 23-valent PS vaccine. Safety data were recorded over 5 days after the immunisation. IgG antibody concentrations, avidity and subclass distribution were measured by EIA. The conjugate without aluminium induced more local adverse effects than the conjugate with aluminium or PS vaccine. All vaccines evoked significant antibody increases to all vaccine specific antigens. Both conjugate vaccines induced antibodies mainly of IgG(2) subclass, and adjuvanted conjugate vaccine induced IgG antibodies with increased avidity. This first administration, to man, of a mixed protein carrier 11-valent pneumococcal conjugate vaccine demonstrated its ability to induce an immune response without significant adverse effects, enabling further study on its use in paediatric populations.
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Affiliation(s)
- T Wuorimaa
- National Public Health Institute, Mannerheimintie 166, 00300, Helsinki, Finland.
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Han HR, Pak S, Guidry A. Prevalence of capsular polysaccharide (CP) types of Staphylococcus aureus isolated from bovine mastitic milk and protection of S. aureus infection in mice with CP vaccine. J Vet Med Sci 2000; 62:1331-3. [PMID: 11193354 DOI: 10.1292/jvms.62.1331] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
To determine the prevalence of capsular polysaccharide (CP) types of Staphylococcus aureus isolated from bovine mastitic milk in Korea, the protective effect of the conjugates, composed of microencapsulated S. aureus clinical isolate type 8 CP bound to Pseudomonas aeruginosa exotoxin A (ETA) was evaluated in mice. Of 107 S. aureus isolates, serotype 5 and 8 accounted for only 26 or 24.2%. When serotype 336 antiserum was employed, fifty of the remaining 81 isolates were typed as 336, 26 reacted with two serotypes, and 5 were nontypeable. Mice challenged with the same strain used for immunization had fewer S. aureus cells in their kidneys than mice challenged with the heterologous strain. But the magnitudes of difference on bacterial clearance were similar in both groups, indicating that the significance of this result remains to be determined. Mice immunized with the conjugate elicited an antibody response 3 days post injection, which persisted for 13 days of the observation period after second injection in some mice. The mice immunized with the CP8-ETA conjugates developed antibodies significantly higher than those immunized with CP-Freund's adjuvant or PBS. In in vivo bacterial challenge experiment, the survival rate of mice immunized with CPS-ETA conjugate was significantly higher than that of mice immunized with PBS. It was suggested that CP8-ETA vaccine had a potential to protect mice against experimental S. aureus bacteremia.
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Affiliation(s)
- H R Han
- Department of Internal Medicine, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Korea
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17
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Han HR, Pak SI, Kang SW, Jong WS, Youn CJ. Capsular polysaccharide typing of domestic mastitis-causing Staphylococcus aureus strains and its potential exploration of bovine mastitis vaccine development. I. Capsular polysaccharide typing, isolation and purification of the strains. J Vet Sci 2000; 1:53-60. [PMID: 14612621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
Abstract
One hundred seven isolates of Staphylococcus aureus from bovine mastitis were investigated for colony morphology in serum-soft agar (SSA), autoagglutination in salt, and capsular serotype. Capsular polysaccharide (CP) was purified and quantified from the extracts of clinical isolates. Overall, 89 isolates (83.2%) were diffuse in the SSA, without any difference in the proportion of diffuse colony between type 5 and type 8 strains. Some strains exhibited compact colonies in the SSA and expressed CP as determined by an enzyme-linked immunosorbent assay, indicating that compact morphology does not exclude encapsulation. The majority of the strains (11/12) showed autoagglutination in the salt aggregation test. The serotype 336 accounted for 46.7% of the isolates followed by serotype 5 (12.1%) and serotype 8 (12.1%). Particularly, twenty-six (24.3%) isolates reacted with two serotypes; 7 for type 8/336 and 19 for type 5/336. Five isolates (4.7%) were nontypeable with monoclonal antibodies specific for CP serotype 5, 8, or 336. The CP concentration in culture supernatants varied with the serotypes, and the total amount of CP produced by cells grown in a liquid medium was much less than that produced by cells grown on a solid medium. The Western blotting indicated that the CP bands of S. aureus serotype 5 and 8 were ranged in the molecular mass of 58-84 kilodalton (kDa), with additional bands in the region of approximately >/= 48 or </= 84 kDa.
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Affiliation(s)
- H R Han
- Department of Internal Medicine, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea
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18
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Drogari-Apiranthitou M, Fijen CA, Van De Beek D, Hensen EF, Dankert J, Kuijper EJ. Development of antibodies against tetravalent meningococcal polysaccharides in revaccinated complement-deficient patients. Clin Exp Immunol 2000; 119:311-6. [PMID: 10632668 PMCID: PMC1905508 DOI: 10.1046/j.1365-2249.2000.01130.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Individuals deficient in C3 or a late complement component are susceptible to recurrent meningococcal infections. Since they experience meningococcal episodes mostly with uncommon meningococcal serogroups, vaccination with a tetravalent vaccine containing A, C, Y and W135 polysaccharides has been suggested. We vaccinated a cohort of two C3 and 17 late complement component-deficient (LCCD) patients, revaccinated them 7 years later and investigated the development of their IgG antibodies to the capsular polysaccharides of the meningococcal vaccine. Seven years after the first vaccination levels of IgG antibodies declined compared with the levels present at 6 months after the first vaccination, but were still at least four times higher than before vaccination. Levels of antibodies to Y polysaccharide in serum of complement-deficient patients were rather low but they did not differ significantly from those in serum of healthy non-related controls (P = 0.07). Three months after the second vaccination IgG antibodies against all polysaccharides increased, exceeding those measured at 6 months after the first vaccination. In the 8 years of observation after the first vaccination two new meningococcal infections with strains related to the vaccine (serogroup Y strains) occurred in two patients, 3.5 and 5 years after the first vaccination. Our findings show that high IgG antibody levels against the tetravalent meningococcal polysaccharide vaccine were reached after revaccination of two C3 and 17 LCCD individuals 7 years after the first vaccination. Whether revaccination should be required within a period shorter than 7 years is discussed, since two vaccinees developed meningococcal disease to vaccine serogroup Y.
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Llull D, Muñoz R, López R, García E. A single gene (tts) located outside the cap locus directs the formation of Streptococcus pneumoniae type 37 capsular polysaccharide. Type 37 pneumococci are natural, genetically binary strains. J Exp Med 1999; 190:241-51. [PMID: 10432287 PMCID: PMC2195575 DOI: 10.1084/jem.190.2.241] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The molecular aspects of the type 37 pneumococcal capsular biosynthesis, a homopolysaccharide composed of sophorosyl units (beta-d-Glc-(1-->2)-beta-d-Glc) linked by beta-1,3 bonds, have been studied. Remarkably, the biosynthesis of the type 37 capsule is driven by a single gene (tts) located far apart from the cap locus responsible for capsular formation in all of the types characterized to date in Streptococcus pneumoniae. However, a cap37 locus virtually identical to the cap33f cluster has been found in type 37 strains, although some of its genes are inactivated by mutations. The tts gene has been sequenced and its transcription start point determined. Tts shows sequence motifs characteristic of cellulose synthases and other beta-glycosyltransferases. Insertion of the tts gene into the pneumococcal DNA causes a noticeable genome reorganization in such a way that genes normally separated by more than 350 kb in the chromosome are located together in clinical isolates of type 37. Encapsulated pneumococcal strains belonging to 10 different serotypes (or serogroups) transformed with tts synthesized type 37 polysaccharide, leading to the formation of strains that display the binary type of capsule. Type 37 pneumococcus constitutes the first case of a natural, genetically binary strain and represents a novel alternative to the mechanisms of intertype transformation.
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Affiliation(s)
- Daniel Llull
- From the Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
| | - Rosario Muñoz
- From the Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
| | - Rubens López
- From the Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
| | - Ernesto García
- From the Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
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20
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Califano JV, Schifferle RE, Gunsolley JC, Best AM, Schenkein HA, Tew JG. Antibody reactive with Porphyromonas gingivalis serotypes K1-6 in adult and generalized early-onset periodontitis. J Periodontol 1999; 70:730-5. [PMID: 10440633 DOI: 10.1902/jop.1999.70.7.730] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Six serotypes of Porphyromonas gingivalis have recently been described. We sought to test the hypothesis that serotype specific carbohydrates from these strains are important antigens that elicit potent immune responses. METHODS Serum concentrations of IgG reactive with P. gingivalis serotypes K1-K6 were determined for 28 adult (AP) and 28 generalized early-onset (G-EOP) periodontitis patients previously determined to be seropositive for a broken cell preparation of P. gingivalis. To confirm relationships suggested for K1, K2, and K6 in the analysis of initial data, the study population was increased to 133. RESULTS Frequency of seropositivity for the 6 serotypes ranged from 26 to 54% of subjects. IgG concentrations ranged from 0 to 453 microg/ml with many subjects seropositive to more than one serotype. Concentrations for the subset of patients who was seropositive were high (mean responses ranged from 20 to 105 microg/ml for the 6 serotypes). Significant correlations between seropositivity to serotypes K1 and K5 as well as between K5 and K6 were found. CONCLUSIONS We examined the relationship of diagnosis, race, gender, smoking, probing depth, attachment loss, and antibody reaction with the P. gingivalis serotypes by analysis of variance. Initial findings suggested potential relationships between diagnosis, smoking, race, gender, and antibody reactive with serotypes K1, K2, and K6. A significant relationship did exist between smoking and decreased antibody reactive with P. gingivalis serotype K2. No other relationships were substantiated. We also examined the IgG subclass distribution and found that responses were almost exclusively IgG2. These data support the concept that antibody responses to all 6 serotypes are common in both AP and G-EOP and that these K serotype carbohydrates elicit potent IgG2 responses.
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Affiliation(s)
- J V Califano
- Clinical Research Center for Periodontal Diseases, School of Dentistry, Virginia Commonwealth University, Richmond 23298-0566, USA
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21
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Abstract
Many Escherichia coli strains are covered in a layer of surface-associated polysaccharide called the capsule. Capsular polysaccharides represent a major surface antigen, the K antigen, and more than 80 distinct K serotypes result from structural diversity in these polymers. However, not all capsules consist of K antigen. Some are due to production of an extensive layer of a polymer structurally identical to a lipopolysaccharide O antigen, but distinguished from lipopolysaccharide by the absence of terminal lipid A-core. Recent research has provided insight into the manner in which capsules are organized on the Gram-negative cell surface, the pathways used for their assembly, and the regulatory processes used to control their expression. A limited repertoire of capsule expression systems are available, despite the fact that the producing bacteria occupy a variety of ecological niches and possess diverse physiologies. All of the known capsule assembly systems seen in Gram-negative bacteria are represented in E. coli, as are the majority of the regulatory strategies. Escherichia coli therefore provides a variety of working models on which studies in other bacteria are (or can be) based. In this review, we present an overview of the current molecular and biochemical models for capsule expression in E. coli. By taking into account the organization of capsule gene clusters, details of the assembly pathway, and regulatory features that dictate capsule expression, we provide a new classification system that separates the known capsules of E. coli into four distinct groups.
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Affiliation(s)
- C Whitfield
- Department of Microbiology, University of Guelph, Ontario, Canada.
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22
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John TJ. Right age for Meningococcal vaccine. Indian Pediatr 1998; 35:669-70. [PMID: 10216680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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23
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Abstract
Results from characterization of 211 GBS isolates from early-onset disease indicated that serotypes Ia, III and V accounted for almost 80% of the isolates, and that alpha was the protein most often expressed. Each of the common polysaccharide types had a characteristic predominant protein expression pattern: alpha for Ia, R4 for type III and R1+R4 for type V isolates. Expression of alpha protein was always mutually exclusive of R proteins. The presence of more than one species of R by a given isolate was confirmed by IEP. In addition, PAGE/WB studies verified the multiple MW forms of R1, and the variation from strain to strain in the highest form of R4 that we had previously reported. Our data not only showed the great complexity of the GBS cell surface but also demonstrated the advantage of using both type polysaccharides and surface-localized proteins as markers for characterization of GBS strains.
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Affiliation(s)
- P Ferrieri
- Department of Laboratory Medicine, University of Minnesota Medical School, Minneapolis, USA
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24
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Lemercinier X, Jones C. Full 1H NMR assignment and detailed O-acetylation patterns of capsular polysaccharides from Neisseria meningitidis used in vaccine production. Carbohydr Res 1996; 296:83-96. [PMID: 9008844 DOI: 10.1016/s0008-6215(96)00253-4] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We report essentially complete 1H NMR assignments for the capsular polysaccharides from Neisseria meningitidis serotypes A, C, W-135, and Y. These polysaccharides are components of current polysaccharide vaccines against meningococcal infection and of the polysaccharide-protein conjugate vaccines under development. From these NMR data the pattern of O-acetylation was determined. O-Acetylation of the W-135 polysaccharide is reported for the first time. We also show that, for the Types C and W-135 polysaccharides a migration of O-acetyl groups occurs during storage in solution, and demonstrate that high field 1H NMR represents a simple and sensitive method to define the O-acetylation pattern of individual batches of these polysaccharides.
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Affiliation(s)
- X Lemercinier
- Laboratory for Molecular Structure, National Institute for Biological Standards and Control, South Mimms, Herts, UK
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25
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Abstract
Bacterial polysaccharides are usually associated with the outer surface of the bacterium. They can form an amorphous layer of extracellular polysaccharide (EPS) surrounding the cell that may be further organized into a distinct structure termed a capsule. Additional polysaccharide molecules such as lipopolysaccharide (LPS) or lipooligosaccharide (LOS) may also decorate the cell surface. Polysaccharide capsules may mediate a number of biological processes, including invasive infections of human beings. Discussed here are the genetics and biochemistry of selected bacterial capsular polysaccharides and the basis of capsule diversity but not the genetics and biochemistry of LPS biosynthesis (for reviews see 100, 140).
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Affiliation(s)
- I S Roberts
- School of Biological Siences, University of Manchester, United Kingdom
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26
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Raby R, Blaiss M, Gross S, Herrod HG. Antibody response to unconjugated Haemophilus influenzae b and pneumococcal polysaccharide vaccines in children with recurrent infections. J Allergy Clin Immunol 1996; 98:451-9. [PMID: 8757223 DOI: 10.1016/s0091-6749(96)70170-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Increasingly, antibody testing is being used to evaluate the status of humoral immunity in patients with recurrent infection and suspected immunodeficiency. In the past, we had been impressed that immunization with unconjugated Haemophilus influenzae b (uHib) vaccine provided useful information about the ability to produce antibody to polysaccharides and that the use of pneumococcal polysaccharide (PPS) vaccine frequently produced results that were difficult to interpret. OBJECTIVE The study was carried out to compare antibody responsiveness to vaccination with uHib with the response seen after PPS vaccination. METHODS Twenty children (ages, 2 to 13 years; 11 male) who were referred to our immunology clinic because of recurrent infections were immunized with both uHib vaccine and PPS vaccine. Nine children had previously received conjugated Hib vaccine. RESULTS All 20 children either responded with a twofold or greater increase in antibody titer after uHib vaccine or had preimmunization antibody concentrations of greater than 400 nanograms antibody nitrogen per milliliter (ng Ab N/ml). All of the children responded to PPS-3 with postimmunization antibody concentrations greater than 400 ng Ab N/ml. Three children had an increase in titer to PPS-7 of less than twofold, seven did not have a twofold increase in titer to PPS-9, and 15 had an increase in titer to PPS-14 of less than twofold. CONCLUSION Unconjugated Hib vaccine is a potent immunogen in children over 2 years of age. Prior immunization with the conjugate vaccine did not prevent a response to unconjugated vaccine. Unconjugated Hib vaccine appears to be at least as immunogenic as PPS-3 when used as an assessment vaccine for evaluating antibody responsiveness.
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Affiliation(s)
- R Raby
- Department of Pediatrics, University of Tennessee, Memphis, USA
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27
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Abstract
Recently van Winkelhoff et al. (1) described 3 novel serotypes in virulent Porphyromonas gingivalis strains, which were based on different polysaccharide antigens. These antigens probably represent capsular structures and have been designated K1, K2 and K3. In the present study we report on 3 novel capsular serotypes, which are represented by P. gingivalis strains ATCC 49417, HG 1690 and HG 1691. The strains, isolated from patients with periodontitis, showed obvious encapsulation in wet India ink preparations. Thermostable antigens could be detected in the supernatant fractions of autoclaved cells. These antigens appeared to be negatively charged, sensitive to periodate degradation, and resistant to proteinase K treatment. On the basis of these characteristics we conclude that the antigens are probably extra-cellular polysaccharides representing a bacterial capsular structure. These K-antigens did not cross-react with K1, K2 or K3 immune-sera of P. gingivalis, with the exception of the K2 antiserum, which partially recognized K5- and K6-antigens. In contrast, K5 and K6 antisera did not react with the K2-antigen. After absorbtion of the K2 antiserum with cells of strains HG 1690 (K5) and HG 1691 (K6) cross-reactivity was no longer present. We propose these novel serotypes to be designated: K4 (ATCC 49417), K5 (HG 1960) and K6 (HG 1691).
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Affiliation(s)
- M L Laine
- Department of Oral Microbiology, Academic Centre for Dentistry Amsterdam, The Netherlands
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28
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Talaga P, Stahl B, Wieruszeski JM, Hillenkamp F, Tsuyumu S, Lippens G, Bohin JP. Cell-associated glucans of Burkholderia solanacearum and Xanthomonas campestris pv. citri: a new family of periplasmic glucans. J Bacteriol 1996; 178:2263-71. [PMID: 8636027 PMCID: PMC177934 DOI: 10.1128/jb.178.8.2263-2271.1996] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The cell-associated glucans produced by Burkholderia solanacearum and Xanthomonas campestris pv. citri were isolated by trichloroacetic acid treatment and gel permeation chromatography. The compounds obtained were characterized by compositional analysis, matrix-assisted laser desorption ionization mass spectrometry, and high-performance anion-exchange chromatography. B. solanacearum synthesizes only a neutral cyclic glucan containing 13 glucose residues, and X. campestris pv. citri synthesizes a neutral cyclic glucan containing 16 glucose residues. The two glucans were further purified by high-performance anion-exchange chromatography. Methylation analysis revealed that these glucans are linked by 1,2-glycosidic bonds and one 1,6-glycosidic bond. Our 600-MHz homonuclear and 1H-13C heteronuclear nuclear magnetic resonance experiments revealed the presence of a single alpha-1,6-glycosidic linkage, whereas all other glucose residues are beta-1,2 linked. The presence of this single alpha-1,6 linkage, however, induces such structural constraints in these cyclic glucans that all individual glucose residues could be distinguished. The different anomeric proton signals allowed complete sequence-specific assignment of both glucans. The structural characteristics of these glucans contrast with those of the previously described osmoregulated periplasmic glucans.
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Affiliation(s)
- P Talaga
- Laboratoire de Chimie Biologique, Centre National de la Recherche Scientifique UMR 11, Université des Sciences et Technologies de Lille, France
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29
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Babich EM. [The phenotypic heterogeneity of meningococcal strains by their serogroup trait]. Mikrobiol Z 1996; 58:65-72. [PMID: 8729467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
It is shown that heterogeneity of meningococci of the outlined serogroups is formed due to appearance of nonagglutinable individuals in subpopulations but heterogeneity of polyagglutinable strains is characterized by incorporation not only of cross-reacting cells, but also microcommunities of each separate group which make a total feature. Serologically inactive strains either may be homogeneous or may form variants with low (to 20%) and high (to 44%) specific weight of agglutinable colonies. Strains in the centres embrace different concentrations of microcommunities which are identical by their serogroup properties to subpopulations of the meningitis pathogen.
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30
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Abstract
The mucilage 'phenomenon' of marine waters, a sporadic but massive accumulation of gelatinous material at and below the water surface, can create serious environmental and economic problems. To address these problems, we must understand better the causes of the phenomenon, its modulation by environmental factors and its adverse effects on ecosystems. In the context of an improved understanding, this brief review describes the means to characterize mucilage types and mucilage aggregates in their native condition, or as close to native as state-of-the-art technology will permit. Biological, chemical and physical factors interact to determine mucilage 'speciation' and thus the specific properties of mucilaginous materials. These factors and their interactions are described briefly in relation to the molecular biology of mucilage synthesis, the formation of submicroscopic 'particles' of mucilage and the morphology of mucilage aggregates. To facilitate current attempts to relate mucilage fine structure to the macroscale morphology of large aggregates (e.g., as found in the Adriatic Sea), attention will be focused on the 'fibril', a ribbon-like colloid rich in polysaccharide molecules. Such colloids (submicrometre particles) present many morphotypes which are identifiable by transmission electron microscopy; several fibril types appear as basic structural units in many kinds of mucilage aggregates in aquatic ecosystems. Attention will also be focused on (1) the problems of coping with analyzing mixtures of highly-hydrated, physically-unstable materials and (2) the detection, assessment and minimization of colloid instability artifacts which have confounded morphological analyses of mucilage aggregates in the past.
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Affiliation(s)
- G G Leppard
- Rivers Research Branch, National Water Research Institute, Environment Canada, Burlington, Ontario
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31
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Abstract
Many members of the Actinobacillus-Haemophilus-Pasteurella group (family Pasteurellaceae) have been misclassified. This article reviews the chemotaxonomic characters that recently have been provided to improve the taxonomy of Pasteurellaceae. These include fatty acids of whole cells, of lipopolysaccharides and of single colonies, together with sugar contents of whole cells, of whole defatted cells, of lipopolysaccharides and of single colonies. This article also reviews taxonomy aided by distribution of proteins in whole cells and outer membranes, distribution of enzymes in outer membrane vesicles and in whole cells, bacteriolysis induced by ethylenediaminetetraacetic acid and hen eggwhite lysozyme and the distribution of respiratory quinones. Furthermore, an overview of characters obtained through studies on genetic transformation, restriction enzyme analysis, restriction fragment length polymorphism, DNA-DNA hybridization, DNA-rRNA hybridization, and 16S rRNA sequencing is given.
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Affiliation(s)
- I Olsen
- Department of Oral Biology, Dental Faculty, University of Oslo, Norway
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32
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Abstract
Knowledge about the type distribution of Streptococcus pneumoniae is fundamental to ensure an effective formulation of pneumococcal vaccine, especially with the possibility of producing a polysaccharide-protein-conjugated vaccine for the prevention of invasive disease in children. During the 6-year period 1982-1987, we received and typed 10,298 isolates from patients with invasive pneumococcal disease: 7,812 (76%) from blood and 2,486 (24%) from CSF. Of all isolates, 81% were recovered from individuals in Europe and 23% were from children. In order of frequency, S. pneumoniae types 6A + 6B, 14, 18C, 19F, 1, 7F, 23F, 19A, 4, and 5 were most commonly isolated from children, and types 3, 1, 14, 7F, 4, 6A + 6B, 8, 23F, 9V, and 19F, from adults. The pneumococcal types in the currently available 23-valent vaccine represented 87% of all isolates in this study, but the proportion of vaccine types varied somewhat with age and source. In all pneumococcal groups included in the vaccine, the vaccine types represented > 80% of the isolates, except in groups 6, 15, and 18.
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Affiliation(s)
- S V Nielsen
- World Health Organization Collaborating Centre for Reference and Research on Pneumococci, Statens Seruminstitut, Copenhagen, Denmark
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33
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Abstract
Multilocus enzyme electrophoresis was used to characterize 27 Pseudomonas aeruginosa serogroup reference strains used in the major O-antigen schemes according to which Pseudomonas aeruginosa has been typed. Sixteen enzyme loci were assayed, ten of which showed electrophoretic variation. Genetic diversity was expressed for each enzyme locus, and as the mean allelic diversity of loci. Ten electrophoretic types were identified among the strains. The genetic distance between pairs of electrophoretic types was expressed as the proportion of loci at which similar alleles occurred. More than 80% similarity was observed between any pair of electrophoretic types, reflecting the homogeneity of multilocus genotypes within this species. Similarity between electrophoretic types was represented in the form of a dendrogram and by multi-dimensional scaling. Three distinct clusters of electrophoretic types were revealed; within each the serogroups appeared to be randomly distributed.
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Affiliation(s)
- C Charnock
- Department of Microbiology, University of Oslo, Norway
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34
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Poh CL, Yeo CC, Tay L. Genome fingerprinting by pulsed-field gel electrophoresis and ribotyping to differentiate Pseudomonas aeruginosa serotype O11 strains. Eur J Clin Microbiol Infect Dis 1992; 11:817-22. [PMID: 1281770 DOI: 10.1007/bf01960881] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The performance of ribotyping and pulsed-field gel electrophoresis was compared in the differentiation of a collection of 44 Pseudomonas aeruginosa serotype O11 strains isolated in seven hospitals in Singapore. Digestion of genomic DNA by EcoRI and SacI followed by Southern hybridization with the Pseudomonas aeruginosa 16S and 23S rRNA gene revealed seven distinct ribotypes. Ribotyping using a combination of both enzymes revealed 11 ribotypes. In contrast, electrophoretic analysis differentiated 41 different strain types among the 44 clinical isolates using either SpeI or DraI. Pulsed-field gel electrophoresis demonstrated greater sensitivity than ribotyping in the differentiation of Pseudomonas aeruginosa strains of the same ribotype and could thus be used alone in epidemiological investigations of hospital outbreaks of Pseudomonas aeruginosa serotype O11 infection.
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Affiliation(s)
- C L Poh
- Department of Microbiology, Faculty of Medicine, National University of Singapore, Kent Ridge
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35
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Plikaytis BD, Turner SH, Gheesling LL, Carlone GM. Comparisons of standard curve-fitting methods to quantitate Neisseria meningitidis group A polysaccharide antibody levels by enzyme-linked immunosorbent assay. J Clin Microbiol 1991; 29:1439-46. [PMID: 1909345 PMCID: PMC270131 DOI: 10.1128/jcm.29.7.1439-1446.1991] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We examined several of the more commonly used models (log-log, two forms of the logit-log, and the four-parameter logistic-log transformations) for forming standard or calibration curves by using a standardized enzyme-linked immunosorbent assay (ELISA). Assay range, accuracy, and error for each function were measured and compared. Antibody levels to Neisseria meningitidis group A polysaccharide were estimated by calculating antibody concentrations of a serially diluted standard reference serum of known concentration. Each function achieved a high squared correlation coefficient (r2 greater than 0.97), indicating a high degree of accuracy in forming the standard curves. However, when predicted antibody concentrations were compared with the known values, the log-log function exhibited the least precision, with extreme percentages of error occurring at several dilutions. A partially specified logit-log transformation performed better than the log-log model over a reduced range of standard dilutions. This indicated that a high r2 alone was not a reliable measure of the accuracy of the standard curve. Of the methods surveyed, the logistic-log and fully specified logit-log functions were the most accurate models for forming standard curves and for interpolating antibody concentrations from the standard curve. The accuracy of the fully specified logit-log function is highly dependent on the precise specification of two unknown quantities, the optical densities at zero and infinite concentrations, prior to fitting the model to a typical set of calibration data. The four-parameter logistic-log function was the preferred choice for quantitating N. meningitidis group A total polysaccharide antibody by using a standardized ELISA. The function does not require prespecification of any parameters before estimating the standard curve, and the four parameters are readily interpretable in terms of identifiable physical quantities. This model also has the advantage that it is easiest to visualize since it does not incorporate complex transformations of the optical density scale.
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Affiliation(s)
- B D Plikaytis
- Biostatistics and Information Management Branch, Centers for Disease Control, Atlanta, Georgia 30333
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Poutrel B, Mendolia C, Sutra L, Fournier JM. Reactivity of coagulase-negative staphylococci isolated from cow and goat milk with monoclonal antibodies to Staphylococcus aureus capsular polysaccharide types 5 and 8. J Clin Microbiol 1990; 28:358-60. [PMID: 2312680 PMCID: PMC269607 DOI: 10.1128/jcm.28.2.358-360.1990] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Monoclonal antibodies to Staphylococcus aureus capsular polysaccharide types 5 and 8 were used in an enzyme-linked immunosorbent assay to serotype 74 and 42 coagulase-negative isolates from cow and goat milk, respectively. Eighteen (15.5%) isolates were typable: 13 Staphylococcus haemolyticus, 1 S. hyicus, 1 S. simulans, and 1 S. warneri from bovine origin and 2 S. lentus from caprine origin. Type 5 was predominant, accounting for about 89% of typable isolates. Reactivity with monoclonal antibodies varied considerably according to isolates. The significance and the potential importance of these findings are discussed.
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Affiliation(s)
- B Poutrel
- Station de Pathologie de la Reproduction, Institut National de la Recherche Agronomique, Nouzilly, France
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Branger C, Goullet P, Boutonnier A, Fournier JM. Correlation between esterase electrophoretic types and capsular polysaccharide types 5 and 8 among methicillin-susceptible and methicillin-resistant strains of Staphylococcus aureus. J Clin Microbiol 1990; 28:150-1. [PMID: 2298873 PMCID: PMC269560 DOI: 10.1128/jcm.28.1.150-151.1990] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The relationship between capsular polysaccharide types 5 and 8 and esterase electrophoretic types (zymotypes) in 160 French clinical isolates of Staphylococcus aureus was studied. Methicillin-susceptible strains of capsular types 5 and 8 were represented by 11 zymotypes, indicating a high polymorphism. Methicillin-resistant strains were mainly distributed in only two distinct populations. The predominant population was represented by strains of zymotype 6 and capsular type 5, and the second population was represented by strains of zymotype 14 and capsular type 8.
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Affiliation(s)
- C Branger
- Laboratoire de Microbiologie, Faculté de Médecine X. Bichat, Paris, France
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Holm SE, Håkansson S. A simple and sensitive enzyme immunoassay for determination of soluble type-specific polysaccharide from group B streptococci. J Immunol Methods 1988; 106:89-94. [PMID: 3276789 DOI: 10.1016/0022-1759(88)90275-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A method was developed for the determination of soluble group B streptococcal type-specific polysaccharide in diluted culture supernatant. The type-specific antigen was immobilized to the solid phase of an enzyme immunoassay using wheat germ agglutinin as a link between the plastic surface and the polysaccharide. The binding of monovalent rabbit antiserum to the type-specific polysaccharide was quantitated by an anti-rabbit IgG-enzyme conjugate. Antisera against each of the polysaccharide types Ia, Ib. II and III gave strong and specific reactions against the respective antigen. The ultimate sensitivity of the assay was 70 pg/ml, as determined for type III polysaccharide. Using this technique, it was found that the concentration of soluble type-specific antigen in a GBS, type III culture supernatant reached a steady-state approximately 3 h after the beginning of the stationary growth phase of the bacteria. Ten type III strains were investigated for synthesis of type-specific polysaccharide, and a positive correlation between the production of capsular and soluble type III antigen was found. There was also an inverse correlation between soluble antigen production and the buoyant densities of these strains. The method described may be used for the serotyping of encapsulated GBS and/or determination of soluble type-specific antigen synthesis.
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Affiliation(s)
- S E Holm
- Department of Clinical Bacteriology, University of Umeå, Sweden
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39
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Belova TN, Efimov DD. [Immunoelectrophoretic identification of the molecular heterogeneity of meningococcal serogroup polysaccharides]. Mol Gen Mikrobiol Virusol 1986:34-9. [PMID: 3097526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Kimura A, Hansen EJ. Antigenic and phenotypic variations of Haemophilus influenzae type b lipopolysaccharide and their relationship to virulence. Infect Immun 1986; 51:69-79. [PMID: 3484459 PMCID: PMC261067 DOI: 10.1128/iai.51.1.69-79.1986] [Citation(s) in RCA: 158] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Haemophilus influenzae type b (Hib) strains NO100 and COL10 were found to produce bacteremia in infant rats at a much lower frequency than other Hib strains previously tested. These relatively avirulent strains were the only Hib strains among 200 clinical isolates examined to date which failed to react with two Hib lipopolysaccharide (LPS)-specific monoclonal antibodies (MAbs). LPS analysis by sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that strains NO100 and COL10 possessed LPS which migrated faster than the LPS of Hib strains that reacted with one of the two or with both of these MAbs. These observations suggested that the relative lack of virulence of strains NO100 and COL10 might be related to their unusual LPS phenotype. To determine whether alteration of LPS structure would affect the virulence of these strains, we identified and isolated isogenic LPS antigenic variants of strains NO100 and COL10 using the LPS-specific MAbs 4C4 and 5G8 in a colony blot radioimmunoassay. Antigenic variation of LPS was found to occur spontaneously in these two strains at a relatively high frequency in terms of both acquisition and loss of MAb reactivity (ca. 0.2 to 16.7%). LPS antigenic variants of strains NO100 and COL10 reactive with both MAbs 4C4 and 5G8 (4C4+ 5G8+) were more virulent in the infant rat model than their respective 4C4- 5G8- parental strains (P less than 0.01). An antigenic variant of COL10 reactive with only MAb 4C4 (4C4+ 5G8-) was also significantly more virulent than its 4C4- 5G8- parent. These LPS antigenic variants with increased virulence synthesized altered LPS molecules which possessed apparent molecular weights higher than those of the LPS of the parental strains. Increased resistance of strain NO100 to the bactericidal activity of normal infant rat serum was associated with changes in LPS structure, while strain COL10 and its LPS variants were all uniformly resistant to serum bactericidal activity. Our results demonstrate that (i) spontaneous antigenic and phenotypic variation of LPS occurs at a relatively high frequency in some strains of Hib; (ii) the higher-molecular-weight type of LPS is associated with the full expression of Hib virulence; (iii) LPS phenotype may not correlate with Hib serum resistance; and (iv) serum resistance of Hib is not an accurate indicator of virulence.
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Karakawa WW, Fournier JM, Vann WF, Arbeit R, Schneerson RS, Robbins JB. Method for the serological typing of the capsular polysaccharides of Staphylococcus aureus. J Clin Microbiol 1985; 22:445-7. [PMID: 3930565 PMCID: PMC268430 DOI: 10.1128/jcm.22.3.445-447.1985] [Citation(s) in RCA: 102] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
A method is described for typing Staphylococcus aureus capsular polysaccharides that is based on direct bacterial cell agglutination and immunoprecipitation of cell extracts with monospecific antisera. Encapsulated strains were identified by their inagglutinability with teichoic acid antisera. The typing sera reacted specifically with extracts of eight prototype strains.
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Abstract
The level of antibody to pneumococcal 19F polysaccharide (PS) was studied in the serum of mice inoculated with klebsiella K2 PS or pneumococcal 19F PS or both. The serum antibody levels and the IgM plaque-forming-cell (PFC) response after immunization were higher in mice given both K2 PS and 19F PS than in mice of a control group given 19F PS alone. This immune response was also higher than the sum of PFC production in mice given 19F PS or K2 PS separately. Thus, K2 PS produced the cross-reactive antibody to 19F PS and also enhanced the magnitude of the antibody response to 19F PS. This response appeared to be specific for the 19F PS. The resulting high levels of antibody to pneumococcal 19F persisted for eight weeks after the administration of K2 PS and 19F PS. Animals immunized with both type 3 PS and K2 PS did not show an increased antibody response to pneumococcal type 3 PS. Klebsiella K-O3 antigen also stimulated the immune response to 19F PS. Higher immunologic responses to 19F PS were also induced in nude mice injected with the cross-reacting K2 PS or K47 PS and 19F PS. The ability to stimulate an antibody response to 19F PS by administering both K2 PS and 19F PS could not be transferred with spleen cells obtained from mice given both K2 PS and 19F PS.
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Arbeit RD, Karakawa WW, Vann WF, Robbins JB. Predominance of two newly described capsular polysaccharide types among clinical isolates of Staphylococcus aureus. Diagn Microbiol Infect Dis 1984; 2:85-91. [PMID: 6232086 DOI: 10.1016/0732-8893(84)90002-6] [Citation(s) in RCA: 136] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A capsular polysaccharide typing schema for Staphylococcus aureus, based upon the preparation of rabbit typing sera with eight prototype strains, has been reported ( Karakawa and Vann , 1982). These antisera were used to classify the capsular polysaccharides of 246 S. aureus isolates from patients in a survey of hospitals in several countries and 49 consecutive blood isolates obtained over a 17-month period in a clinical study at the Boston Veterans' Administration Medical Center. Two capsular types, 5 and 8, accounted for about 70% of these isolates; most of the remaining strains could not be typed with the available antisera. The clinical study of bacteremia identified capsular types 5 and 8 among both community-acquired and nosocomial isolates and showed that strains bearing these two types caused the patterns of disease reported for staphylococcal bacteremia. There was an association between the phage type and the capsular type of these bacteremic strains. The capsular types of the "classic" encapsulated strains of S. aureus, M (type 1) and Smith (type 2), were not observed among blood isolates in this study. The observation that most clinical isolates of S. aureus belong to two recently defined capsular types provides a new focus for investigations into the virulence of this common nosocomial pathogen and suggests the potential for protective acquired immunity against staphylococcal bacteremia.
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Barry MA, Craven DE, Finland M. Serotypes of Streptococcus pneumoniae isolated from blood cultures at Boston City Hospital between 1979 and 1982. J Infect Dis 1984; 149:449-52. [PMID: 6715901 DOI: 10.1093/infdis/149.3.449] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Serotypes of pneumococci causing bacteremia were examined from January 1979 through December 1982. Of the 271 isolates recorded, 52% were from adults and 48% were from children. The rate of pneumococcal bacteremia for adults was 2.67 cases per 1,000 admissions; rates were not calculated for pediatric patients. The six most common pediatric types or groups (14, 19, 18, 6, 4, and 9) accounted for 90% of the total pediatric isolates, and the six most common adult types or groups (12, 9, 8, 4, 3, and 6) made up 55.3% of the total adult isolates. More than 96% of the pneumococcal types isolated from the blood cultures of pediatric patients are present in the 14-valent pneumococcal vaccine, compared with 72.7% of the adult isolates. The results demonstrate that most cases of pneumococcal bacteremia are caused by capsular types or groups present in the current vaccine and that minor changes in the types of pneumococci causing bacteremia have occurred during the past decade.
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Abstract
Mucoid strains of Vibrio parahaemolyticus were isolated from the stools of two asymptomatic carriers and a patient with gastroenteritis. The strains demonstrated biochemical reactions and antibiotic susceptibility typical of nonmucoid strains of V. parahaemolyticus isolated locally. The slime substance was typed by coagglutination and was antigenically similar to the capsular antigen of the same strain. Three different serotypes (O10:K24, O5:K17, and O5:K15) were involved.
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Robbins JB, Austrian R, Lee CJ, Rastogi SC, Schiffman G, Henrichsen J, Mäkelä PH, Broome CV, Facklam RR, Tiesjema RH. Considerations for formulating the second-generation pneumococcal capsular polysaccharide vaccine with emphasis on the cross-reactive types within groups. J Infect Dis 1983; 148:1136-59. [PMID: 6361173 DOI: 10.1093/infdis/148.6.1136] [Citation(s) in RCA: 364] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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Melby K, Leinslie T, Hagen N, Vorland LH. Antibiotic susceptibility pattern and capsular types of Haemophilus influenzae recovered from clinical specimens in northern Norway. Acta Pathol Microbiol Immunol Scand B 1983; 91:383-7. [PMID: 6424404 DOI: 10.1111/j.1699-0463.1983.tb00064.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
One hundred and nine strains of Haemophilus influenzae recovered from clinical specimens were examined for antibiotic sensitivity pattern and capsular types. All strains from blood cultures, cerebrospinal fluid and a joint aspirate were type b whereas most of the isolates were acapsular when recovered from other specimens viz. wound secretions (67%), maxillary sinus (75%), lower resp tract (86%), nasal cavity (90%). Out of the 109 strains 88 (81%) were non-typable, and 3.6% were beta-lactamase-producing, two of which were type e, one was type b and one was acapsular. Three beta-lactamase-producing strains were isolated from specimens from the respiratory tract and one from blood cultures. Beta-lactamase-producing strains including one chloramphenicol-resistant strain harboured similar plasmids, as judged by agarose gel electrophoresis. The strains showed quite a uniform sensitivity to antibacterial agents with the exception of sulphonamides to which the capsular strains, particularly type b strains, were less susceptible.
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Beuvery EC, Leussink AB, Van Delft RW, Tiesjema RH, Nagel J. Immunoglobulin M and G antibody responses and persistence of these antibodies in adults after vaccination with a combined meningococcal group A and group C polysaccharide vaccine. Infect Immun 1982; 37:579-85. [PMID: 6811434 PMCID: PMC347572 DOI: 10.1128/iai.37.2.579-585.1982] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Adult volunteers were injected with a combined meningococcal group A and group C polysaccharide vaccine. Immunoglobulin M (IgM) and IgG antibody levels against both polysaccharides were measured in serum samples taken 14 days as well as 3 years after vaccination. For both group A and group C polysaccharides, the IgM and IgG antibody levels at 14 days postvaccination were positively related. The IgM-to-IgG antibody ratio at 14 days postvaccination was an indicator for the persistence of both IgM and IgG antibodies during the next 3 years; a high ratio meant a short persistence, whereas a low ratio was associated with a long persistence.
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Abstract
The hydrolyses of the immunologically cross-reactive and constitutionally isomeric group 6 pneumococcal polysaccharides, types 6A and 6B, were investigated by 31P nuclear magnetic resonance spectroscopy, gel filtration through Sepharose 4B, reducing-sugar analysis, and rocket immunoelectrophoresis. Phosphorus nuclear magnetic resonance spectroscopy showed that cleavage of the repeating-unit phosphodiester linkages at pH 10, 60 degrees C was considerably faster (greater than 10(3) ) for the type 6A than the type 6B polysaccharide. Under these reaction conditions, 31P nuclear magnetic resonance kinetic measurements showed that the Na+ form of the type 6A polysaccharide underwent phosphodiester-linkage hydrolysis two times slower than the corresponding Ca+2 form; a stoichiometrically excess amount of Ca+2 caused a 30-fold enhancement of the latter hydrolysis rate. The spectroscopic characterization of phosphorus-containing end groups resulting from hydrolysis of the type 6A polymer provided additional mechanistic information. Heating the type 6A and 6B polysaccharides at 56 degrees C for various times led to gel filtration coefficients of distribution (Kd values) which indicated that the type 6A material underwent size reductions considerably faster than did the type 6B antigen; these increased Kd values qualitatively correlated with the loss of immunochemical reactivity measured by rocket immunoelectrophoresis. The application of a statistical theory to the depolymerization of the type 6A and 6B polysaccharides was consistent with random bond cleavage, as evidenced by the calculated versus measured gel filtration patterns. Although the molecular changes causing the size reductions were not fully elaborated, it was established that the acetal linkages of the type 6A and 6B polysaccharides were comparatively resistant to hydrolysis and that depolymerization by hydrolysis of the phosphodiester linkage was a major factor only in the type 6A structure. It was concluded that the hydrolytic stability of the type 6B antigen would favor its use in the polyvalent pneumococcal vaccine rather than the cross-reactive, but comparatively unstable, type 6A polysaccharide, if all other factors are equal.
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Abstract
To determine the importance of specific capsule type in the pathogenesis of invasive Haemophilus influenzae disease, we compared the virulence of type b and type d strains isolated from different children with the virulence of transformation-derived type b and type d organisms. In addition, the unencapsulated derivative of these strains was also examined. Virulence was assessed by determining the ability of the strains to produce bacteremia with intranasal or subcutaneous inoculation. Unencapsulated derivatives were unable to cause bacteremia by any route; all type b strains (whether natural or derived by transformation), a natural type d, and a type d derived by transformation were able to produce bacteremia with similar frequency (42 to 62%) when 10(7) colony-forming units was given intranasally. Subcutaneous inoculation of 10(3) colony-forming units of strains with the type b capsule produced bacteremia at a greater frequency than did the strains with the type d capsule (P less than 0.002). The type d isolate was more virulent than a mutagenized derivative of the strain. We conclude that the type b strains are more virulent than type d when inoculated subcutaneously.
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