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2016 ; 214
(6
): 925-34
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gab.com Text
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Streptococcus oralis and Candida albicans Synergistically Activate ?-Calpain to
Degrade E-cadherin From Oral Epithelial Junctions
#MMPMID27190184
Xu H
; Sobue T
; Bertolini M
; Thompson A
; Dongari-Bagtzoglou A
J Infect Dis
2016[Sep]; 214
(6
): 925-34
PMID27190184
show ga
Streptococcus oralis forms robust mucosal biofilms with Candida albicans that
have increased pathogenic potential. In this study, using oral epithelial
cultures, organotypic oral mucosal constructs, and a mouse model of oral
infection, we demonstrated that S. oralis augmented C. albicans invasion through
epithelial junctions. C. albicans and S. oralis decreased epithelial E-cadherin
levels by synergistically increasing µ-calpain, a proteolytic enzyme that targets
E-cadherin. In the mouse coinfection model this was accompanied by increased
fungal kidney dissemination. Coinfection with a secreted aspartyl protease (sap)
mutant sap2456 and S. oralis increased ?-calpain and triggered mucosal invasion
and systemic dissemination, suggesting that fungal protease activity is not
required for invasion during coinfection. We conclude that C. albicans and S.
oralis synergize to activate host enzymes that cleave epithelial junction
proteins and increase fungal invasion.