Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.18/7363 |
Resumo: | Bacterial biofilms are an important virulence factor with a vital role in evasion from the host immune system, colonization and infection. The aim of the present study was to evaluate in vitro the effects of three environmental factors (H+, glucose and human plasma) in biofilm formation, by carrier and invasive Streptococcus agalactiae strains of ST17 and ST19 sequence types, including DNase producers and non-producers. Bacteria ability to assemble biofilms was classified based on crystal violet assay. Biofilm formation was also monitored by scanning electron microscopy. Depending on the growth medium used, each bacterial isolate could fit in different biofilm production categories. Our data showed that optimal conditions for S. agalactiae biofilm assembly were reached after 48 h incubation at pH 7.6 in the presence of glucose and inactivated human plasma. In the presence of inactivated human plasma, the biofilm biomass of ST19 strains experienced a higher increase than ST17 strains. The composition of the extracellular polymeric matrix of the three strongest biofilm producers (all from ST17) was accessed by enzymatic digestion of mature biofilms and proteins were shown to be the predominant component. The detailed identification of the extracellular protein components should contribute to the development of new therapeutic strategies to fight S. agalactiae infections. |
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Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiaeStreptococcus agalactiaeBiofilmsExtracellular Polymeric Substance MatrixDNasesBacterial biofilms are an important virulence factor with a vital role in evasion from the host immune system, colonization and infection. The aim of the present study was to evaluate in vitro the effects of three environmental factors (H+, glucose and human plasma) in biofilm formation, by carrier and invasive Streptococcus agalactiae strains of ST17 and ST19 sequence types, including DNase producers and non-producers. Bacteria ability to assemble biofilms was classified based on crystal violet assay. Biofilm formation was also monitored by scanning electron microscopy. Depending on the growth medium used, each bacterial isolate could fit in different biofilm production categories. Our data showed that optimal conditions for S. agalactiae biofilm assembly were reached after 48 h incubation at pH 7.6 in the presence of glucose and inactivated human plasma. In the presence of inactivated human plasma, the biofilm biomass of ST19 strains experienced a higher increase than ST17 strains. The composition of the extracellular polymeric matrix of the three strongest biofilm producers (all from ST17) was accessed by enzymatic digestion of mature biofilms and proteins were shown to be the predominant component. The detailed identification of the extracellular protein components should contribute to the development of new therapeutic strategies to fight S. agalactiae infections.Elsevier/ Institut PasteurRepositório Científico do Instituto Nacional de SaúdeSilvestre, InêsBorrego, Maria JoséJordão, Luísa2021-03-08T15:53:50Z2020-122020-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.18/7363engRes Microbiol. 2020 Dec;171(8):311-318. doi: 10.1016/j.resmic.2020.08.001. Epub 2020 Sep 5.0923-250810.1016/j.resmic.2020.08.001info:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-20T15:41:58Zoai:repositorio.insa.pt:10400.18/7363Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:42:00.627625Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
title |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
spellingShingle |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae Silvestre, Inês Streptococcus agalactiae Biofilms Extracellular Polymeric Substance Matrix DNases |
title_short |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
title_full |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
title_fullStr |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
title_full_unstemmed |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
title_sort |
Biofilm formation by ST17 and ST19 strains of Streptococcus agalactiae |
author |
Silvestre, Inês |
author_facet |
Silvestre, Inês Borrego, Maria José Jordão, Luísa |
author_role |
author |
author2 |
Borrego, Maria José Jordão, Luísa |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Repositório Científico do Instituto Nacional de Saúde |
dc.contributor.author.fl_str_mv |
Silvestre, Inês Borrego, Maria José Jordão, Luísa |
dc.subject.por.fl_str_mv |
Streptococcus agalactiae Biofilms Extracellular Polymeric Substance Matrix DNases |
topic |
Streptococcus agalactiae Biofilms Extracellular Polymeric Substance Matrix DNases |
description |
Bacterial biofilms are an important virulence factor with a vital role in evasion from the host immune system, colonization and infection. The aim of the present study was to evaluate in vitro the effects of three environmental factors (H+, glucose and human plasma) in biofilm formation, by carrier and invasive Streptococcus agalactiae strains of ST17 and ST19 sequence types, including DNase producers and non-producers. Bacteria ability to assemble biofilms was classified based on crystal violet assay. Biofilm formation was also monitored by scanning electron microscopy. Depending on the growth medium used, each bacterial isolate could fit in different biofilm production categories. Our data showed that optimal conditions for S. agalactiae biofilm assembly were reached after 48 h incubation at pH 7.6 in the presence of glucose and inactivated human plasma. In the presence of inactivated human plasma, the biofilm biomass of ST19 strains experienced a higher increase than ST17 strains. The composition of the extracellular polymeric matrix of the three strongest biofilm producers (all from ST17) was accessed by enzymatic digestion of mature biofilms and proteins were shown to be the predominant component. The detailed identification of the extracellular protein components should contribute to the development of new therapeutic strategies to fight S. agalactiae infections. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12 2020-12-01T00:00:00Z 2021-03-08T15:53:50Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.18/7363 |
url |
http://hdl.handle.net/10400.18/7363 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Res Microbiol. 2020 Dec;171(8):311-318. doi: 10.1016/j.resmic.2020.08.001. Epub 2020 Sep 5. 0923-2508 10.1016/j.resmic.2020.08.001 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/embargoedAccess |
eu_rights_str_mv |
embargoedAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier/ Institut Pasteur |
publisher.none.fl_str_mv |
Elsevier/ Institut Pasteur |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799132165078777856 |