SciELO - Scientific Electronic Library Online

vol.14 número1Estudio toxicologico de un inyectable apocrifo conteniendo hierro como principio activo índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




  • No hay articulos citadosCitado por SciELO

Links relacionados


Acta toxicológica argentina

versión On-line ISSN 1851-3743


BALAGUE, Claudia  y  EVANGELISTA DE DUFFARD, Ana María. Effect of the herbicide 2,4-dichlorophenoxyacetic acid on fimbriation of uropathogenic bacteria. Acta toxicol. argent. [online]. 2006, vol.14, n.1, pp.12-17. ISSN 1851-3743.

Epidemiological data demonstrate, on rural populations, that the frequency of inflammatory lesions in renal tissue is higher for individuals exposed to pesticides. Previous studies demonstrated that the herbicide 2,4-D altered the bacterial adherence properties to renal tissue, mediated by fimbriae in uropathogenic Escherichia coli, but the mechanism involved is still unknown. The acid 2,4- D has the ability to perform covalent bonds to proteins in gram-negative bacteria. Because of this fact, we hypothesized that the 2,4-D acid binds proteins involved in the synthesis, export or ensemble of fimbrial subunits, modifying fimbrial expression. In this work we demonstrated a covalent bond of the herbicide to outer membrane proteins in uropathogenic E. coli and a parallel decrease of fimbriation, assayed by three different methods: hemmaglutination, surface protein quantification and electron microscopy. An important conclusion is that the accidental exposure of rural workers to 2,4-D may have a protective effect by a decrease in fimbriation, when it is used in low doses and during a short period of exposure. But, it must be considered that high doses and several days of exposure had adverse effects, like recurrence of infection, in the mouse model of ascending pyelonephritis (Balagué et al, 2002). Probably, the epidemiological studies that associate the herbicide exposure with renal infection were due to the last kind of exposure described.

Palabras clave : 2,4-D; Fimbriae; Escherichia coli; Urinary infection.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons