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Title: Production and release of heat-labile toxin by wild-type human-derived enterotoxigenic Escherichia coli
Authors: Simoes Lasaro, Melissa Ang
Rodrigues, Juliana Falcao
Mathias-Santos, Camila
Guth, Beatriz Ernestina Cabilio [UNIFESP]
Regua-Mangia, Adriana
Piantino Ferreira, Antonio Jose
Takagi, Mickie
Cabrera-Crespo, Joaquin
Sbrogio-Almeida, Maria Elisabete
Souza Ferreira, Luis Carlos de
Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Fdn Oswaldo Cruz
Inst Butantan
Keywords: heat-labile toxin
enterotoxigenic Escherichia coli
labile toxin production/secretion
diarrheal disease
Issue Date: 1-Oct-2006
Publisher: Blackwell Publishing
Citation: Fems Immunology and Medical Microbiology. Oxford: Blackwell Publishing, v. 48, n. 1, p. 123-131, 2006.
Abstract: 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.
ISSN: 0928-8244
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