Inhibition of enteropathogenic Escherichia coli (EPEC) adhesion to HeLa cells by human colostrum: detection of specific sIgA related to EPEC outer-membrane proteins.

Abstract:

:Human colostrum and a high molecular weight colostrum fraction (HMWF; > 14,000 D) prevented the adhesion of localized adherent (LA+) O111:H-enteropathogenic Escherichia coli (EPEC) to HeLa cells. This effect was abolished after absorption with an O111:H-LA + EPEC strain, but absorption with a LA- strain of same serotype had no effect on the process. A low molecular weight fraction (< 14,000 D), absorbed or not with LA+ or LA- bacterial strains, did not inhibit the adherence of E. coli to HeLa cells. IgA-depleted colostrum had no inhibitory effect on bacterial adhesion, demonstrating the critical role of this protein in the phenomenon. Heat inactivation of whole colostrum did not significantly modify the inhibition adherence levels. Immunoblots of O111:H-LA+ strain outer-membrane complex reacted with colostrum and HMWF showing that IgA antibodies were predominantly reactive with a 94-kD protein. These data confirm and extend observations about colostrum sIgA participation in adhesion inhibition of EPEC to HeLa cells and its response to a 94-kD outer-membrane protein.

authors

Camara LM,Carbonare SB,Silva ML,Carneiro-Sampaio MM

doi

10.1159/000236645

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

307-10

issue

3

eissn

1018-2438

issn

1423-0097

journal_volume

103

pub_type

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