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Infect Immun, August 1998, p. 3673-3681, Vol. 66, No. 8
CJF 94.07 INSERM,
Received 4 March 1998/Returned for modification 21 April
1998/Accepted 12 May 1998
When the intracellular pathogen Listeria monocytogenes
infects cultured human mucosecreting polarized HT29-MTX cells apically, it induces the stimulation of mucus exocytosis without cell entry. Using a set of isogenic mutants and purified listeriolysin O (LLO), we
identified the L. monocytogenes thiol-activated exotoxin
LLO as the agonist of mucus secretion. We demonstrated that the
LLO-induced mucus exocytosis did not result from the LLO
membrane-damaging activity. We found that LLO-induced mucus exocytosis
is an event requiring the binding of LLO to a brush border-associated
receptor and membrane oligomerization of the exotoxin. By a
pharmacological approach, we demonstrated that no regulatory system or
intracellular transducing signal known to be involved in control of
mucin exocytosis was activated by LLO. Based on the present data, the
stimulatory action of LLO on mucin exocytosis could be accounted for
either by an unknown signaling system which remains to be determined or
by direct action of LLO with the membrane vesicle components involved
in the intracellular vesicular transport of mucins.
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Listeria monocytogenes Stimulates Mucus
Exocytosis in Cultured Human Polarized Mucosecreting Intestinal
Cells through Action of Listeriolysin O
*
Corresponding author. Mailing address: CJF 94.07 INSERM, Faculté de Pharmacie Paris XI, F-92296
Châtenay-Malabry, France. Phone and fax: 01.46.83.56.61. E-mail:
alain.servin{at}cep.u-psud.fr.
Infect Immun, August 1998, p. 3673-3681, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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