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Role of exopolysaccharide, the rugose phenotype and VpsR in the pathogenesis of epidemic Vibrio cholerae.
Rashid, Mohammed H; Rajanna, Chythanya; Zhang, Dalin; Pasquale, Vincenzo; Magder, Laurence S; Ali, Afsar; Dumontet, Stefano; Karaolis, David K R.
Afiliação
  • Rashid MH; Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
FEMS Microbiol Lett ; 230(1): 105-13, 2004 Jan 15.
Article em En | MEDLINE | ID: mdl-14734172
Vibrio cholerae, the causative agent of cholera can produce an exopolysaccharide (EPS). Some strains can also phenotypically switch from a smooth to a 'rugose' phenotype characterized by small wrinkled colonies, overproduction of EPS, increased biofilm formation in vitro and increased resistance to various stressful conditions. High frequency switching to the rugose phenotype is more common in epidemic strains than in non-pathogenic strains, suggesting EPS production and the rugose phenotype are important in cholera epidemiology. VpsR up-regulates Vibrio polysaccharide (VPS) genes and the synthesis of extracellular EPS (VPS). However, the function of VPS, the rugose phenotype and VpsR in pathogenesis is not well understood. We report that rugose strains of both classical and El Tor biotypes of epidemic V. cholerae are defective in the in vitro production of extracellular collagenase activity. In vivo studies in rabbit ileal loops suggest that VpsR mutants are attenuated in reactogenicity. Intestinal colonization studies in infant mice suggest that VPS production, the rugose phenotype and VpsR have a role in pathogenesis. Our results indicate that regulated VPS production is important for promoting in vivo biofilm formation and pathogenesis. Additionally, VpsR might regulate genes with roles in virulence. Rugose strains appear to be a subpopulation of cells that might act as a 'helper' phenotype promoting the pathogenesis of certain strains. Our studies provide new insight into the potential role of VPS, the rugose phenotype and VpsR in the pathogenesis of epidemic V. cholerae.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Polissacarídeos Bacterianos / Proteínas de Bactérias / Vibrio cholerae / Cólera / Surtos de Doenças Tipo de estudo: Etiology_studies Limite: Animals / Humans Idioma: En Ano de publicação: 2004 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Polissacarídeos Bacterianos / Proteínas de Bactérias / Vibrio cholerae / Cólera / Surtos de Doenças Tipo de estudo: Etiology_studies Limite: Animals / Humans Idioma: En Ano de publicação: 2004 Tipo de documento: Article