Susceptibility to verotoxin as a function of the cell cycle.

Abstract:

:Infection with Verotoxin producing Escherichia coli (VTEC) has been implicated in hemolytic uremic syndrome, the leading cause of pediatric renal failure. Verotoxin (VT) binds to globotriaosylceramide (Gal alpha 1-4Gal beta 1-4GlcCer Gb3) in susceptible cells. Gb3 is required for cytotoxicity and toxin-resistant cells deficient in Gb3 can be sensitized to VT cytotoxicity by incorporation of exogenous Gb3 into the cells. However, the absolute Gb3 content of cell lines does not necessarily correspond directly with the degree of sensitivity to VT. The present study demonstrates that susceptibility to VT is a function of cell growth and that stationary phase cells are resistant to VT. Using chemically synchronized Vero cells, we have also found a tenfold difference in susceptibility to VT during the cell cycle. Our experiments define a maximal sensitivity "window" of 1-2 hours from the G1/S boundary. This corresponds to increased VT binding without change in overall Gb3 content. Cell surface labelling indicated that cyclic turnover and exposure of Gb3 may be the critical parameter in determining VT sensitivity. Such changes during the cell cycle may also be of relevance in vivo in determining toxin pathology during VTEC infections and the physiology of plasma membrane Gb3.

journal_name

J Cell Physiol

authors

Pudymaitis A,Lingwood CA

doi

10.1002/jcp.1041500324

keywords:

subject

Has Abstract

pub_date

1992-03-01 00:00:00

pages

632-9

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

150

pub_type

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