Purificação e caracterização de uma toxina enterotóxica, citotóxina e letal produzida por amostras de Plesiomonas shigelloides isoladas de água de rio. / Purification and caracterization of an enterotoxic, cytotoxic and lethal toxin produced by Plesiomonas shigelloides isolated from river water.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Plesiomonas shigelloides is a ubiquous microorganism recognized as putative human and animal enteropathogen. Production of toxins has been related to their role in pathogenicity. At previous studies we detected a cytotoxin, named LCF (Lethal Citotoxic Factor) active on a variety of cells, causing intensive intracellular vacuolation and nuclear condensation, leading to death. The toxin purification revealed a heat-labile protein of about 48 kDa by electrophoresis analysis in poliacrylamide gel (SDS-PAGE). The cytotoxic activity was partially neutralized by anti-LT-1 (type 1 termolabile enterotoxin of Escherichia coli) and by anti-aerolisin (cytotoxic enterotoxin of Aeromonas). Western blot analysis to anti-LT-1 showed no serological reaction. Fluid accumulation occurred when toxin was applied to the intestine of newborn mice and to rabbit intestinal loop assays. LCF was lethal to mice and rats, leading them to cardiac death when injected intravenously. Considering the results, these isolates of P. shigelloides have shown great potential as pathogens.

ASSUNTO(S)

atividade letal citotoxin plesiomomas shigelloides enterotoxin plesiomomas shigelloides cardiotoxin purification lethal activity enterotoxinas cardiotoxina purificação citotoxinas

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