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The Saccharomyces boulardii CNCM I-745 strain shows protective effects against the B. anthracis LT toxin.

Pontier-Bres R, Rampal P, Peyron JF, Munro P, Lemichez E, Czerucka D - Toxins (Basel) (2015)

Bottom Line: Exposure of polarized T84 cells to LT affected cell monolayer integrity, modified the morphology of tight junctions and induced the formation of actin stress fibers.Overnight treatment of cells with S. boulardii before incubation with LT maintained the integrity of the monolayers, prevented morphological modification of tight junctions, restricted the effects of LT on actin remodeling and delayed LT-induced MEK-2 cleavage.Mechanistically, we demonstrated that in the presence of S. boulardii, the medium is depleted of both LF and PA sub-units of LT and the appearance of a cleaved form of PA.

View Article: PubMed Central - PubMed

Affiliation: Centre Scientifique de Monaco, Monaco 98000, Monaco.

ABSTRACT
The probiotic yeast Saccharomyces boulardii (S. boulardii) has been prescribed for the prophylaxis and treatment of several infectious diarrheal diseases. Gastrointestinal anthrax causes fatal systemic disease. In the present study, we investigated the protective effects conferred by Saccharomyces boulardii CNCM I-745 strain on polarized T84 columnar epithelial cells intoxicated by the lethal toxin (LT) of Bacillus anthracis. Exposure of polarized T84 cells to LT affected cell monolayer integrity, modified the morphology of tight junctions and induced the formation of actin stress fibers. Overnight treatment of cells with S. boulardii before incubation with LT maintained the integrity of the monolayers, prevented morphological modification of tight junctions, restricted the effects of LT on actin remodeling and delayed LT-induced MEK-2 cleavage. Mechanistically, we demonstrated that in the presence of S. boulardii, the medium is depleted of both LF and PA sub-units of LT and the appearance of a cleaved form of PA. Our study highlights the potential of the S. boulardii CNCM I-745 strain as a prophylactic agent against the gastrointestinal form of anthrax.

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Co-precipitation of LF with S. boulardii. Co-precipitation of LF with S. boulardii after 2, 6 and 24 h of co-incubation. Proteins were resolved on SDS-PAGE 12% and visualized by Coomassie blue staining.
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toxins-07-04455-f005: Co-precipitation of LF with S. boulardii. Co-precipitation of LF with S. boulardii after 2, 6 and 24 h of co-incubation. Proteins were resolved on SDS-PAGE 12% and visualized by Coomassie blue staining.

Mentions: Furthermore, using a similar assay, we observed the co-precipitation of LF with the S. boulardii cell fraction (Figure 5).


The Saccharomyces boulardii CNCM I-745 strain shows protective effects against the B. anthracis LT toxin.

Pontier-Bres R, Rampal P, Peyron JF, Munro P, Lemichez E, Czerucka D - Toxins (Basel) (2015)

Co-precipitation of LF with S. boulardii. Co-precipitation of LF with S. boulardii after 2, 6 and 24 h of co-incubation. Proteins were resolved on SDS-PAGE 12% and visualized by Coomassie blue staining.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663514&req=5

toxins-07-04455-f005: Co-precipitation of LF with S. boulardii. Co-precipitation of LF with S. boulardii after 2, 6 and 24 h of co-incubation. Proteins were resolved on SDS-PAGE 12% and visualized by Coomassie blue staining.
Mentions: Furthermore, using a similar assay, we observed the co-precipitation of LF with the S. boulardii cell fraction (Figure 5).

Bottom Line: Exposure of polarized T84 cells to LT affected cell monolayer integrity, modified the morphology of tight junctions and induced the formation of actin stress fibers.Overnight treatment of cells with S. boulardii before incubation with LT maintained the integrity of the monolayers, prevented morphological modification of tight junctions, restricted the effects of LT on actin remodeling and delayed LT-induced MEK-2 cleavage.Mechanistically, we demonstrated that in the presence of S. boulardii, the medium is depleted of both LF and PA sub-units of LT and the appearance of a cleaved form of PA.

View Article: PubMed Central - PubMed

Affiliation: Centre Scientifique de Monaco, Monaco 98000, Monaco.

ABSTRACT
The probiotic yeast Saccharomyces boulardii (S. boulardii) has been prescribed for the prophylaxis and treatment of several infectious diarrheal diseases. Gastrointestinal anthrax causes fatal systemic disease. In the present study, we investigated the protective effects conferred by Saccharomyces boulardii CNCM I-745 strain on polarized T84 columnar epithelial cells intoxicated by the lethal toxin (LT) of Bacillus anthracis. Exposure of polarized T84 cells to LT affected cell monolayer integrity, modified the morphology of tight junctions and induced the formation of actin stress fibers. Overnight treatment of cells with S. boulardii before incubation with LT maintained the integrity of the monolayers, prevented morphological modification of tight junctions, restricted the effects of LT on actin remodeling and delayed LT-induced MEK-2 cleavage. Mechanistically, we demonstrated that in the presence of S. boulardii, the medium is depleted of both LF and PA sub-units of LT and the appearance of a cleaved form of PA. Our study highlights the potential of the S. boulardii CNCM I-745 strain as a prophylactic agent against the gastrointestinal form of anthrax.

Show MeSH
Related in: MedlinePlus