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2016 ; 11
(3
): e0149159
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Intestinal Cell Tight Junctions Limit Invasion of Candida albicans through Active
Penetration and Endocytosis in the Early Stages of the Interaction of the Fungus
with the Intestinal Barrier
#MMPMID26933885
Goyer M
; Loiselet A
; Bon F
; L'Ollivier C
; Laue M
; Holland G
; Bonnin A
; Dalle F
PLoS One
2016[]; 11
(3
): e0149159
PMID26933885
show ga
C. albicans is a commensal yeast of the mucous membranes in healthy humans that
can also cause disseminated candidiasis, mainly originating from the digestive
tract, in vulnerable patients. It is necessary to understand the cellular and
molecular mechanisms of the interaction of C. albicans with enterocytes to better
understand the basis of commensalism and pathogenicity of the yeast and to
improve the management of disseminated candidiasis. In this study, we
investigated the kinetics of tight junction (TJ) formation in parallel with the
invasion of C. albicans into the Caco-2 intestinal cell line. Using invasiveness
assays on Caco-2 cells displaying pharmacologically altered TJ (i.e.
differentiated epithelial cells treated with EGTA or patulin), we were able to
demonstrate that TJ protect enterocytes against invasion of C. albicans.
Moreover, treatment with a pharmacological inhibitor of endocytosis decreased
invasion of the fungus into Caco-2 cells displaying altered TJ, suggesting that
facilitating access of the yeast to the basolateral side of intestinal cells
promotes endocytosis of C. albicans in its hyphal form. These data were supported
by SEM observations of differentiated Caco-2 cells displaying altered TJ, which
highlighted membrane protrusions engulfing C. albicans hyphae. We furthermore
demonstrated that Als3, a hypha-specific C. albicans invasin, facilitates
internalization of the fungus by active penetration and induced endocytosis by
differentiated Caco-2 cells displaying altered TJ. However, our observations
failed to demonstrate binding of Als3 to E-cadherin as the trigger mechanism of
endocytosis of C. albicans into differentiated Caco-2 cells displaying altered
TJ.