Production and release of heat-labile toxin by wild-type human-derived enterotoxigenic Escherichia coli
| Autor: | Melissa Ang Simões Lasaro, Camila Mathias-Santos, Adriana Hamond Regua-Mangia, Luís Carlos de Souza Ferreira, Mickie Takagi, Joaquin Cabrera-Crespo, M. E. Sbrogio-Almeida, Juliana Rodrigues, Antonio José Piantino Ferreira, Beatriz E. C. Guth |
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| Přispěvatelé: | Universidade de São Paulo (USP), Universidade Federal de São Paulo (UNIFESP), Fdn Oswaldo Cruz, Inst Butantan |
| Rok vydání: | 2006 |
| Předmět: |
enterotoxigenic Escherichia coli
Microbiology (medical) Hot Temperature Immunology labile toxin production/secretion medicine.disease_cause Microbiology Enterotoxins In vivo Enterotoxigenic Escherichia coli medicine Escherichia coli Immunology and Allergy Animals Humans Secretion heat-labile toxin Escherichia coli Infections biology Toxin General Medicine diarrheal disease biology.organism_classification Enterobacteriaceae In vitro Infectious Diseases DIARREIA Rabbits Bacteria |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Repositório Institucional da UNIFESP Universidade Federal de São Paulo (UNIFESP) instacron:UNIFESP |
| ISSN: | 0928-8244 |
| Popis: | Production and release of heat-labile toxin (LT) by wild-type enterotoxigenic Escherichia coli (ETEC) strains, isolated from diarrheic and asymptomatic Brazilian children, was studied under in vitro and in vivo conditions. Based on a set of 26 genetically diverse LT+ enterotoxigenic E. coli strains, cell-bound LT concentrations varied from 49.8 to 2415 ng mL(-1). the amounts of toxin released in culture supernatants ranged from 0% to 50% of the total synthesized toxin. the amount of LT associated with secreted membrane vesicles represented < 5% of the total toxin detected in culture supernatants. ETEC strains secreting higher amounts of LT, but not those producing high intracellular levels of cell-bound toxin, elicited enhanced fluid accumulation in tied rabbit ileal loops, suggesting that the strain-specific differences in production and secretion of LT correlates with symptoms induced in vivo. However, no clear correlation was established between the ability to produce and secrete LT and the clinical symptoms of the infected individuals. the present results indicate that production and release of LT by wild-type human-derived ETEC strains are heterogeneous traits under both in vitro and in vivo growth conditions and may impact the clinical outcomes of infected individuals. Univ São Paulo, Dept Microbiol, Inst Ciencias Biomed, São Paulo, Brazil Universidade Federal de São Paulo, Dept Microbiol Imunol & Parasitol, São Paulo, Brazil Fdn Oswaldo Cruz, Escola Nacl Saude Publ, Rio de Janeiro, Brazil Univ São Paulo, Dept Patol, Fac Med Vet & Zootecn, São Paulo, Brazil Inst Butantan, Div Desenvolvimento Tecnol & Prod, São Paulo, Brazil Universidade Federal de São Paulo, Dept Microbiol Imunol & Parasitol, São Paulo, Brazil Web of Science |
| Databáze: | OpenAIRE |
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