Inhibition of T-cell response by Escherichia coli heat-labile enterotoxin-treated epithelial cells.

Abstract:

:Escherichia coli heat-labile enterotoxin (LT) is an extensively studied adjuvant of mucosal responses. Nevertheless, its mode of action as an adjuvant remains incompletely understood. In this study, we describe a simplified in vitro model with which to look at some aspects of immunoregulation by LT. The interaction of LT with the apical surface of a monolayer of CaCo-2 epithelial cells induces the release of a soluble factor which inhibits the antigen-induced release of interleukin-2 by T cells cultured at the basolateral side of the cells. The release of this factor requires the ADP-ribosylating activity of LT since the isolated B subunit, as well as an enzymatically silent LT mutant, loses biological activity in this model. The inhibitory activity is likely to be due to prostaglandin release, since it is blocked by indomethacin. The contribution of LT-induced prostaglandin release to the complex immunoregulatory activity of LT is discussed.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Lopes LM,Maroof A,Dougan G,Chain BM

doi

10.1128/iai.68.12.6891-6895.2000

keywords:

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

6891-5

issue

12

eissn

0019-9567

issn

1098-5522

journal_volume

68

pub_type

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