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Zalona Fernandes HM, Miranda KR, da Silva Dias RC, Alviano DS, Duarte RS, da Silva Carvalho AC. The challenges of education in a continental country in the face of new severe acute respiratory coronavirus virus 2 (SARS-CoV-2) variant circulation. Infect Control Hosp Epidemiol 2022; 43:1537-1539. [PMID: 34165056 PMCID: PMC8280394 DOI: 10.1017/ice.2021.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 06/05/2021] [Indexed: 12/01/2022]
Affiliation(s)
| | - Karla Rodrigues Miranda
- Institute of Microbiology, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Daniela Sales Alviano
- Institute of Microbiology, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rafael Silva Duarte
- Institute of Microbiology, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
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Pires ES, Hardoim CCP, Miranda KR, Secco DA, Lobo LA, de Carvalho DP, Han J, Borchers CH, Ferreira RBR, Salles JF, Domingues RMCP, Antunes LCM. The Gut Microbiome and Metabolome of Two Riparian Communities in the Amazon. Front Microbiol 2019; 10:2003. [PMID: 31555238 PMCID: PMC6737013 DOI: 10.3389/fmicb.2019.02003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 08/15/2019] [Indexed: 01/15/2023] Open
Abstract
During the last decades it has become increasingly clear that the microbes that live on and in humans are critical for health. The communities they form, termed microbiomes, are involved in fundamental processes such as the maturation and constant regulation of the immune system. Additionally, they constitute a strong defense barrier to invading pathogens, and are also intricately linked to nutrition. The parameters that affect the establishment and maintenance of these microbial communities are diverse, and include the genetic background, mode of birth, nutrition, hygiene, and host lifestyle in general. Here, we describe the characterization of the gut microbiome of individuals living in the Amazon, and the comparison of these microbial communities to those found in individuals from an urban, industrialized setting. Our results showed striking differences in microbial communities from these two types of populations. Additionally, we used high-throughput metabolomics to study the chemical ecology of the gut environment and found significant metabolic changes between the two populations. Although we cannot point out a single cause for the microbial and metabolic changes observed between Amazonian and urban individuals, they are likely to include dietary differences as well as diverse patterns of environmental exposure. To our knowledge, this is the first description of gut microbial and metabolic profiles in Amazonian populations, and it provides a starting point for thorough characterizations of the impact of individual environmental conditions on the human microbiome and metabolome.
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Affiliation(s)
- Eder Soares Pires
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Instituto Tecnológico Vale - Desenvolvimento Sustentável, Belém, Brazil
| | | | - Karla Rodrigues Miranda
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Danielle Angst Secco
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leandro Araújo Lobo
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Denise Pires de Carvalho
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, aRio de Janeiro, Brazil
| | - Jun Han
- University of Victoria - Genome British Columbia Proteomics Centre, University of Victoria, Victoria, BC, Canada
| | - Christoph H Borchers
- University of Victoria - Genome British Columbia Proteomics Centre, University of Victoria, Victoria, BC, Canada.,Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, Canada.,Segal Cancer Proteomics Centre, Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, QC, Canada.,Gerald Bronfman Department of Oncology, Jewish General Hospital, McGill University, Montreal, QC, Canada
| | - Rosana B R Ferreira
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Joana Falcão Salles
- Microbial Ecology Cluster, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, Netherlands
| | | | - Luis Caetano Martha Antunes
- Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil.,Instituto Nacional de Ciência e Tecnologia de Inovação em Doenças de Populações Negligenciadas, Centro de Desenvolvimento Tecnológico em Saúde, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
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Nunes CF, Nogueira JS, Vianna PHO, Ciambarella BT, Rodrigues PM, Miranda KR, Lobo LA, Domingues RMCP, Busch M, Atella GC, Vale AM, Bellio M, Nóbrega A, Canto FB, Fucs R. Probiotic treatment during neonatal age provides optimal protection against experimental asthma through the modulation of microbiota and T cells. Int Immunol 2019; 30:155-169. [PMID: 29420746 DOI: 10.1093/intimm/dxy011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 02/02/2018] [Indexed: 02/06/2023] Open
Abstract
The incidence of allergic diseases, which increased to epidemic proportions in developed countries over the last few decades, has been correlated with altered gut microbiota colonization. Although probiotics may play a critical role in the restoration of gut homeostasis, their efficiency in the control of allergy is controversial. Here, we aimed to investigate the effects of probiotic treatment initiated at neonatal or adult ages on the suppression of experimental ovalbumin (OVA)-induced asthma. Neonatal or adult mice were orally treated with probiotic bacteria and subjected to OVA-induced allergy. Asthma-like symptoms, microbiota composition and frequencies of the total CD4+ T lymphocytes and CD4+Foxp3+ regulatory T (Treg) cells were evaluated in both groups. Probiotic administration to neonates, but not to adults, was necessary and sufficient for the absolute prevention of experimental allergen-induced sensitization. The neonatally acquired tolerance, transferrable to probiotic-untreated adult recipients by splenic cells from tolerant donors, was associated with modulation of gut bacterial composition, augmented levels of cecum butyrate and selective accumulation of Treg cells in the airways. Our findings reveal that a cross-talk between a healthy microbiota and qualitative features inherent to neonatal T cells, especially in the Treg cell subset, might support the beneficial effect of perinatal exposure to probiotic bacteria on the development of long-term tolerance to allergens.
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Affiliation(s)
- Caroline Fraga Nunes
- Departamento de Imunologia, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Departamento de Imunobiologia, Instituto de Biologia - Universidade Federal Fluminense, Niterói - RJ, Brazil
| | - Jeane S Nogueira
- Departamento de Imunologia, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Departamento de Imunobiologia, Instituto de Biologia - Universidade Federal Fluminense, Niterói - RJ, Brazil
| | - Pedro Henrique Oliveira Vianna
- Departamento de Imunologia, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | - Karla Rodrigues Miranda
- Faculdade de Farmácia - Universidade Federal do Rio de Janeiro, Rio de Janeiro/Campus Macaé, Macaé - RJ, Brazil
| | - Leandro Araújo Lobo
- Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro - RJ, Brazil
| | | | - Mileane Busch
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro - RJ, Brazil.,Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, INCT-EM, Rio de Janeiro - RJ, Brazil
| | - Georgia Correa Atella
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro - RJ, Brazil.,Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, INCT-EM, Rio de Janeiro - RJ, Brazil
| | - André Macedo Vale
- Laboratório de Imunorreceptores e Sinalização, Instituto de Biofísica Carlos Chagas Filho - Universidade Federal do Rio de Janeiro, Rio de Janeiro - RJ, Brazil
| | - Maria Bellio
- Departamento de Imunologia, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alberto Nóbrega
- Departamento de Imunologia, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fábio B Canto
- Departamento de Imunologia, Instituto de Microbiologia Paulo de Goés (IMPG) - Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.,Departamento de Imunobiologia, Instituto de Biologia - Universidade Federal Fluminense, Niterói - RJ, Brazil
| | - Rita Fucs
- Departamento de Imunobiologia, Instituto de Biologia - Universidade Federal Fluminense, Niterói - RJ, Brazil
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Pauer H, Hardoim CCP, Teixeira FL, Miranda KR, Barbirato DDS, de Carvalho DP, Antunes LCM, Leitão ÁADC, Lobo LA, Domingues RMCP. Impact of violacein from Chromobacterium violaceum on the mammalian gut microbiome. PLoS One 2018; 13:e0203748. [PMID: 30212521 PMCID: PMC6136722 DOI: 10.1371/journal.pone.0203748] [Citation(s) in RCA: 10] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 08/20/2018] [Indexed: 12/03/2022] Open
Abstract
Violacein is a violet pigment produced by Chromobacterium violaceum that possesses several functions such as antibacterial, antiviral, antifungal, and antioxidant activities. The search for potential compounds and therapies that may interfere with and modulate the gut microbial consortia without causing severe damage and increased resistance is important for the treatment of inflammatory, allergic, and metabolic diseases. The aim of the present work was to evaluate the ability of violacein to change microbial patterns in the mammalian gut by favoring certain groups over the others in order to be used as a therapy for diseases associated with changes in the intestinal microflora. To do this, we used male Wistar rats, and administered violacein orally, in low (50 μg/ml) and high (500 μg/ml) doses for a month. Initially, the changes in the microbial diversity were observed by DGGE analyses that showed that the violacein significantly affects the gut microbiota of the rats. Pyrosequencing of 16S rDNA was then employed using a 454 GS Titanium platform, and the results demonstrated that higher taxonomic richness was observed with the low violacein treatment group, followed by the control group and high violacein treatment group. Modulation of the microbiota at the class level was observed in the low violacein dose, where Bacilli and Clostridia (Firmicutes) were found as dominant. For the high violacein dose, Bacilli followed by Clostridia and Actinobacteria were present as the major components. Further analyses are crucial for a better understanding of how violacein affects the gut microbiome and whether this change would be beneficial to the host, providing a framework for the development of alternative treatment strategies for intestinal diseases using this compound.
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Affiliation(s)
- Heidi Pauer
- Laboratório de Biologia de Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Cristiane Cassiolato Pires Hardoim
- Laboratório de Interação Hospedeiro-Microbiota, Instituto de Biociências, Universidade Estadual Paulista, Campus do Litoral Paulista, São Vicente, SP, Brazil
| | - Felipe Lopes Teixeira
- Laboratório de Biologia de Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Karla Rodrigues Miranda
- Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Campus Macaé, Macaé, RJ, Brazil
| | | | - Denise Pires de Carvalho
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro–Rio de Janeiro, Brazil
| | - Luis Caetano Martha Antunes
- Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Inovação em Doenças de Populações Negligenciadas, Centro de Desenvolvimento Tecnológico em Saúde, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | | | - Leandro Araujo Lobo
- Laboratório de Biologia de Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- * E-mail:
| | - Regina Maria Cavalcanti Pilotto Domingues
- Laboratório de Biologia de Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Reis LC, Rôças IN, Siqueira JF, de Uzeda M, Lacerda VS, Domingues R, Miranda KR, Saraiva RM. Bacteremia after supragingival scaling and dental extraction: Culture and molecular analyses. Oral Dis 2018; 24:657-663. [PMID: 28994220 DOI: 10.1111/odi.12792] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Revised: 09/06/2017] [Accepted: 09/29/2017] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To study the incidence and magnitude of bacteremia after dental extraction and supragingival scaling. SUBJECTS AND METHODS Blood samples were taken before and 5 and 30 min after dental extraction and supragingival scaling from individuals at high (n = 44) or negligible risk (n = 51) for infective endocarditis. The former received prophylactic antibiotic therapy. Samples were subjected to aerobic and anaerobic culture and quantitative real-time polymerase chain reaction to determine the incidence of bacteremia and total bacterial levels. RESULTS Patients who did not receive prophylactic antibiotic therapy had a higher incidence of positive blood cultures (30% 5 min after extraction) than patients who received prophylactic antibiotic therapy (0% 5 min after extraction; p < .01). Molecular analysis did not reveal significant differences in the incidence or magnitude of bacteremia between the two patient groups either 5 or 30 min after each of the procedures evaluated. Extraction was associated with higher incidence of bacteremia than supragingival scaling by blood culture (p = .03) and molecular analysis (p = .05). CONCLUSIONS Molecular methods revealed that dental extraction and supragingival scaling were associated with similar incidence of bacteremia in groups receiving or not prophylactic antibiotic therapy. However, blood culture revealed that antibiotic therapy reduced viable cultivable bacteria in the bloodstream in the extraction group.
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Affiliation(s)
- L C Reis
- National Institute of Cardiology, Rio de Janeiro, Brazil
| | - I N Rôças
- Department of Endodontics, Estácio de Sá University, Rio de Janeiro, Brazil
| | - J F Siqueira
- Department of Endodontics, Estácio de Sá University, Rio de Janeiro, Brazil
| | - M de Uzeda
- Department of Endodontics, Estácio de Sá University, Rio de Janeiro, Brazil
| | - V S Lacerda
- National Institute of Cardiology, Rio de Janeiro, Brazil
| | - Rmcp Domingues
- Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - K R Miranda
- Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - R M Saraiva
- Evandro Chagas National Institute of Infectious Diseases, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
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Peixoto RJM, Miranda KR, Lobo LA, Granato A, de Carvalho Maalouf P, de Jesus HE, Rachid CTCC, Moraes SR, Dos Santos HF, Peixoto RS, Rosado AS, Domingues RMCP. Antarctic strict anaerobic microbiota from Deschampsia antarctica vascular plants rhizosphere reveals high ecology and biotechnology relevance. Extremophiles 2016; 20:875-884. [PMID: 27709303 DOI: 10.1007/s00792-016-0878-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 09/24/2016] [Indexed: 12/21/2022]
Abstract
The Antarctic soil microbial community has a crucial role in the growth and stabilization of higher organisms, such as vascular plants. Analysis of the soil microbiota composition in that extreme environmental condition is crucial to understand the ecological importance and biotechnological potential. We evaluated the efficiency of isolation and abundance of strict anaerobes in the vascular plant Deschampsia antarctica rhizosphere collected in the Antarctic's Admiralty Bay and associated biodiversity to metabolic perspective and enzymatic activity. Using anaerobic cultivation methods, we identified and isolated a range of microbial taxa whose abundance was associated with Plant Growth-Promoting Bacteria (PGPB) and presences were exclusively endemic to the Antarctic continent. Firmicutes was the most abundant phylum (73 %), with the genus Clostridium found as the most isolated taxa. Here, we describe two soil treatments (oxygen gradient and heat shock) and 27 physicochemical culture conditions were able to increase the diversity of anaerobic bacteria isolates. Heat shock treatment allowed to isolate a high percentage of new species (63.63 %), as well as isolation of species with high enzymatic activity (80.77 %), which would have potential industry application. Our findings contribute to the understanding of the role of anaerobic microbes regarding ecology, evolutionary, and biotechnological features essential to the Antarctic ecosystem.
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Affiliation(s)
- Rafael José Marques Peixoto
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil.
| | - Karla Rodrigues Miranda
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil
| | - Leandro Araujo Lobo
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil
| | - Alessandra Granato
- Laboratório Integrado de Imunologia, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Hugo Emiliano de Jesus
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Caio T C C Rachid
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Saulo Roni Moraes
- Universidade Severino Sombra, Vassouras, Rio de Janeiro, Brazil.,Universidade Veiga de Almeida, Rio de Janeiro, Brazil
| | - Henrique Fragoso Dos Santos
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Raquel Silva Peixoto
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alexandre Soares Rosado
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Regina Maria Cavalcanti Pilotto Domingues
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil
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Peixoto RJM, Miranda KR, Ferreira EO, de Paula GR, Rocha ER, Lobo LA, Domingues RMCP. Production of AI-2 is mediated by the S-ribosylhomocystein lyase gene luxS in Bacteroides fragilis and Bacteroides vulgatus. J Basic Microbiol 2013; 54:644-9. [PMID: 24026770 DOI: 10.1002/jobm.201300311] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 07/26/2013] [Indexed: 11/09/2022]
Abstract
Quorum sensing is a cell-cell signaling mechanism based on cell density and that involves the production of hormone-like molecules called autoinducers (AI). One of the most studied AIs has been termed AI-2, and its biosynthesis requires the enzyme encoded by luxS. We have previously described for the first time that Bacteroides species can produce molecules with AI-2 activity. In this study, we focus on the detection of luxS and its activity as the AI-2 synthase in Bacteroides species. The strains Bacteroides fragilis B3b and Bacteroides vulgatus ATCC 8482 were selected based on a positive phenotype for AI-2 production and the presence of a putative luxS in the genome, respectively. In order to identify the luxS gene, cloning and heterologous expression strategies were utilized. We demonstrate that both strains contain functional luxS orthologs that can complement AI-2 production in Escherichia coli.
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Miranda KR, Neves FPG, Santos-Filho JD, de Paula GR, Lobo LA, Oelemann WMR, Domingues RMCP. Application of DNA sequence analysis based on five different conserved genes (16S rDNA, rpoB, gdh, est and pgm) for intra-species discrimination of Bacteroides fragilis. Anaerobe 2013. [DOI: 10.1016/j.anaerobe.2012.11.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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B D Vieira JM, Boente RF, Rodrigues Miranda K, Avelar KES, M C P Domingues R, Candida de S Ferreira M. Decreased Susceptibility to Nitroimidazoles Among Bacteroides Species in Brazil. Curr Microbiol 2005; 52:27-32. [PMID: 16391998 DOI: 10.1007/s00284-005-0068-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2005] [Accepted: 06/13/2005] [Indexed: 10/25/2022]
Abstract
In this study, 197 strains of Bacteroides genus from different species and origins were evaluated with regard to their susceptibility to 5-nitroimidazoles (5-Ni)-such as tinidazole, ornidazole, and metronidazole-using the agar dilution method. The presence of nim genes was also investigated by polymerase chain reaction. It was found that 5.6% of Bacteroides strains among all origins showed decreased susceptibility (minimum inhibitory concentrations varying from 4 to 16 microg/ml) to at least one of the imidazoles studied without any known nim gene associate. Also, we detected one strain isolated from a polluted aquatic environment in which one nim gene was found and characterized as nim B using restriction fragment length polymorphism and sequencing. Hence, resistance to 5-Ni should be monitored closely because they constitute, among few drugs, the ones quite effective in treating Bacteroides infections.
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Affiliation(s)
- Jessica Manya B D Vieira
- Laboratório de Biologia de Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Professor Paulo de Góes, CCS, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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Antunes LCM, Ferreira LQ, Ferreira EO, Miranda KR, Avelar KES, Domingues RMCP, Ferreira MCDS. Bacteroides species produce Vibrio harveyi autoinducer 2-related molecules. Anaerobe 2005; 11:295-301. [PMID: 16701587 DOI: 10.1016/j.anaerobe.2005.03.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2004] [Revised: 06/08/2004] [Accepted: 03/25/2005] [Indexed: 11/19/2022]
Abstract
Quorum sensing is a density-dependent gene regulation mechanism that has been described in many bacterial species in the last decades. Bacteria that use quorum sensing as part of their gene regulation circuits produce molecules called autoinducers that accumulate in the environment and activate target genes in a quorum-dependent way. Some specific clues led us to hypothesize that Bacteroides species can produce autoinducers and possess a quorum sensing system. First, Bacteroides are anaerobic bacteria that are frequently involved in polymicrobial infections. These infections often involve Pseudomonas aeruginosa and Staphylococcus aureus, two of the best understood examples of bacteria that employ quorum sensing systems as part of their pathogenesis. Also, studies have detected the presence of a quorum sensing gene involved in the production of autoinducers in Porphyromonas gingivalis, a species closely related to the Bacteroides genus. These and other evidences prompted us to investigate if Bacteroides strains could produce autoinducer molecules that could be detected by a Vibrio harveyi reporter system. In this paper, we show that supernatants of B. fragilis, B. vulgatus and B. distasonis strains are able to stimulate the V. harveyi quorum sensing system 2. Also, we were able to demonstrate that the stimulation detected is due to the production of autoinducer molecules and not the growth of reporter strains after addition of supernatant. Moreover, the phenomenon observed does not seem to represent the degradation of repressors possibly present in the culture medium used. We could also amplify bands from some of the strains tested using primers designed to the luxS gene of Escherichia coli. Altogether, our results show that B. fragilis, B. vulgatus and B. distasonis (but possibly some other species) can produce V. harveyi autoinducer 2-related molecules. However, the role of such molecules in the biology of these organisms remains unknown.
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Affiliation(s)
- Luis Caetano Martha Antunes
- Departmento de Microbiologia Médica, Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Cidade Universitária, Rio de Janeiro, CEP: 21941-590, RJ-Brasil.
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Rodrigues ML, Travassos LR, Miranda KR, Franzen AJ, Rozental S, de Souza W, Alviano CS, Barreto-Bergter E. Human antibodies against a purified glucosylceramide from Cryptococcus neoformans inhibit cell budding and fungal growth. Infect Immun 2000; 68:7049-60. [PMID: 11083830 PMCID: PMC97815 DOI: 10.1128/iai.68.12.7049-7060.2000] [Citation(s) in RCA: 181] [Impact Index Per Article: 7.5] [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
A major ceramide monohexoside (CMH) was purified from lipidic extracts of Cryptococcus neoformans. This molecule was analyzed by high-performance thin-layer chromatography (HPTLC), gas chromatography coupled with mass spectrometry, and fast atom bombardment-mass spectrometry. The cryptococcal CMH is a beta-glucosylceramide, with the carbohydrate residue attached to 9-methyl-4,8-sphingadienine in amidic linkage to 2-hydroxyoctadecanoic acid. Sera from patients with cryptococcosis and a few other mycoses reacted with the cryptococcal CMH. Specific antibodies were purified from patients' sera by immunoadsorption on the purified glycolipid followed by protein G affinity chromatography. The purified antibodies to CMH (mainly immunoglobulin G1) bound to different strains and serological types of C. neoformans, as shown by flow cytofluorimetry and immunofluorescence labeling. Transmission electron microscopy of yeasts labeled with immunogold-antibodies to CMH and immunostaining of isolated cell wall lipid extracts separated by HPTLC showed that the cryptococcal CMH predominantly localizes to the fungal cell wall. Confocal microscopy revealed that the beta-glucosylceramide accumulates mostly at the budding sites of dividing cells with a more disperse distribution at the cell surface of nondividing cells. The increased density of sphingolipid molecules seems to correlate with thickening of the cell wall, hence with its biosynthesis. The addition of human antibodies to CMH to cryptococcal cultures of both acapsular and encapsulated strains of C. neoformans inhibited cell budding and cell growth. This process was complement-independent and reversible upon removal of the antibodies. The present data suggest that the cryptococcal beta-glucosylceramide is a fungal antigen that plays a role on the cell wall synthesis and yeast budding and that antibodies raised against this component are inhibitory in vitro.
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Affiliation(s)
- M L Rodrigues
- Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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