Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research.
Infections with encapsulated bacteria cause serious clinical problems. Besides being poorly immunogenic, the bacterial capsular polysaccharide (CPS) cloaks antigenic proteins, allowing bacterial evasion of the host immune system. Despite the clinical significance of bacterial CPS and its suggested r...
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crcansciencepubl:10.1139/w2012-003 2024-06-23T07:54:49+00:00 Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. Segura, Mariela 2012 http://dx.doi.org/10.1139/w2012-003 http://www.nrcresearchpress.com/doi/full-xml/10.1139/w2012-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/w2012-003 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Microbiology volume 58, issue 3, page 249-260 ISSN 0008-4166 1480-3275 journal-article 2012 crcansciencepubl https://doi.org/10.1139/w2012-003 2024-05-24T13:05:49Z Infections with encapsulated bacteria cause serious clinical problems. Besides being poorly immunogenic, the bacterial capsular polysaccharide (CPS) cloaks antigenic proteins, allowing bacterial evasion of the host immune system. Despite the clinical significance of bacterial CPS and its suggested role in the pathogenesis of the infection, the mechanisms underlying innate and, critically, adaptive immune responses to encapsulated bacteria have not been fully elucidated. As such, we became interested in studying the CPS of two similar, but unique, streptococcal species: Group B Streptococcus (GBS) and Streptococcus suis . Both streptococci are well encapsulated, some capsular types are more virulent than others, and they can cause severe meningitis and septicemia. For both pathogens, the CPS is considered the major virulence factor. Finally, these two streptococci are the sole Gram-positive bacteria possessing sialic acid in their capsules. GBS type III is a leading cause of neonatal invasive infections. Streptococcus suis type 2 is an important swine and emerging zoonotic pathogen in humans. We recently characterized the S. suis type 2 CPS. It shares common structural elements with GBS, but sialic acid is α2,6-linked to galactose rather than α2,3-linked. Differential sialic acid expression by pathogens might result in modulation of immune cell activation and, consequently, may affect the immuno-pathogenesis of these bacterial infections. Here, we review and compare the interactions of these two sialylated encapsulated bacteria with dendritic cells, known as the most potent antigen-presenting cells linking innate and adaptive immunity. We further address differences between dendritic cells and professional phagocytes, such as macrophages and neutrophils, in their interplay with these encapsulated pathogens. Elucidation of the molecular and cellular basis of the impact of CPS composition on bacterial interactions with immune cells is critical for mechanistic understanding of anti-CPS responses. Knowledge generated ... Article in Journal/Newspaper Newfoundland Canadian Science Publishing Canadian Journal of Microbiology 58 3 249 260 |
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Canadian Science Publishing |
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crcansciencepubl |
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Infections with encapsulated bacteria cause serious clinical problems. Besides being poorly immunogenic, the bacterial capsular polysaccharide (CPS) cloaks antigenic proteins, allowing bacterial evasion of the host immune system. Despite the clinical significance of bacterial CPS and its suggested role in the pathogenesis of the infection, the mechanisms underlying innate and, critically, adaptive immune responses to encapsulated bacteria have not been fully elucidated. As such, we became interested in studying the CPS of two similar, but unique, streptococcal species: Group B Streptococcus (GBS) and Streptococcus suis . Both streptococci are well encapsulated, some capsular types are more virulent than others, and they can cause severe meningitis and septicemia. For both pathogens, the CPS is considered the major virulence factor. Finally, these two streptococci are the sole Gram-positive bacteria possessing sialic acid in their capsules. GBS type III is a leading cause of neonatal invasive infections. Streptococcus suis type 2 is an important swine and emerging zoonotic pathogen in humans. We recently characterized the S. suis type 2 CPS. It shares common structural elements with GBS, but sialic acid is α2,6-linked to galactose rather than α2,3-linked. Differential sialic acid expression by pathogens might result in modulation of immune cell activation and, consequently, may affect the immuno-pathogenesis of these bacterial infections. Here, we review and compare the interactions of these two sialylated encapsulated bacteria with dendritic cells, known as the most potent antigen-presenting cells linking innate and adaptive immunity. We further address differences between dendritic cells and professional phagocytes, such as macrophages and neutrophils, in their interplay with these encapsulated pathogens. Elucidation of the molecular and cellular basis of the impact of CPS composition on bacterial interactions with immune cells is critical for mechanistic understanding of anti-CPS responses. Knowledge generated ... |
format |
Article in Journal/Newspaper |
author |
Segura, Mariela |
spellingShingle |
Segura, Mariela Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. |
author_facet |
Segura, Mariela |
author_sort |
Segura, Mariela |
title |
Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. |
title_short |
Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. |
title_full |
Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. |
title_fullStr |
Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. |
title_full_unstemmed |
Fisher Scientific Award Lecture — The capsular polysaccharides of Group B Streptococcusand Streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 This article is based on an Award Lecture by Dr. Mariela Segura at the 61st Annual Meeting of the Canadian Society of Microbiologists in St. John’s, Newfoundland, on 23 June 2011. Dr. Segura was the recipient of the 2011 Fisher Scientific Award, a national award sponsored by Fisher Scientific to recognize excellence in microbiology research. |
title_sort |
fisher scientific award lecture — the capsular polysaccharides of group b streptococcusand streptococcus suisdifferently modulate bacterial interactions with dendritic cells 1 this article is based on an award lecture by dr. mariela segura at the 61st annual meeting of the canadian society of microbiologists in st. john’s, newfoundland, on 23 june 2011. dr. segura was the recipient of the 2011 fisher scientific award, a national award sponsored by fisher scientific to recognize excellence in microbiology research. |
publisher |
Canadian Science Publishing |
publishDate |
2012 |
url |
http://dx.doi.org/10.1139/w2012-003 http://www.nrcresearchpress.com/doi/full-xml/10.1139/w2012-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/w2012-003 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Microbiology volume 58, issue 3, page 249-260 ISSN 0008-4166 1480-3275 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/w2012-003 |
container_title |
Canadian Journal of Microbiology |
container_volume |
58 |
container_issue |
3 |
container_start_page |
249 |
op_container_end_page |
260 |
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1802647086164869120 |