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Vibrio parahaemolyticus strengthens their virulence through modulation of cellular reactive oxygen species in vitro.

El-Malah SS, Yang Z, Hu M, Li Q, Pan Z, Jiao X - Front Cell Infect Microbiol (2014)

Bottom Line: Our results show that Vp adheres to cell monolayers and can invade non-phagocytic cells.It also survives and persists in non-phagocytic cells by modulating reactive oxygen species (ROS), allowing its replication, and resulting in complete cellular destruction.We conclude that the pathogenicity of Vp is based on its capacities for adhesion and invasion.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University Yangzhou, China.

ABSTRACT
Vibrio parahaemolyticus (Vp) is one of the emergent food-borne pathogens that are commensally associated with various shellfish species throughout the world. It is strictly environmental and many strains are pathogenic to humans. The virulent strains cause distinct diseases, including wound infections, septicemia, and most commonly, acute gastroenteritis, which is acquired through the consumption of raw or undercooked seafood, especially shellfish. Vp has two type three secretion systems (T3SSs), which triggering its cytotoxicity and enterotoxicity via their effectors. To better understand the pathogenesis of Vp, we established a cell infection model in vitro using a non-phagocytic cell line. Caco-2 cells were infected with different strains of Vp (pandemic and non-pandemic strains) and several parameters of cytotoxicity were measured together with adhesion and invasion indices, which reflect the pathogen's virulence. Our results show that Vp adheres to cell monolayers and can invade non-phagocytic cells. It also survives and persists in non-phagocytic cells by modulating reactive oxygen species (ROS), allowing its replication, and resulting in complete cellular destruction. We conclude that the pathogenicity of Vp is based on its capacities for adhesion and invasion. Surprisingly's; enhanced of ROS resistance period could promote the survival of Vp inside the intestinal tract, facilitating tissue infection by repressing the host's oxidative stress response.

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ROS levels in Caco-2 cells. ROS levels were determined in Caco-2 cells by staining with DCFH-DA, and flow cytometric analysis. (A) ROS levels in uninfected cells (control) and in cells infected with all strains at each specific time points. (B) ROS levels in uninfected cells and cells infected with RIMD, a pandemic strain (Vp024), or a non-pandemic strain (Vp029) at different time points. (C) Chart showing the percentages of ROS levels. The reported values are the means ± SEM of three independent experiments.
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Figure 4: ROS levels in Caco-2 cells. ROS levels were determined in Caco-2 cells by staining with DCFH-DA, and flow cytometric analysis. (A) ROS levels in uninfected cells (control) and in cells infected with all strains at each specific time points. (B) ROS levels in uninfected cells and cells infected with RIMD, a pandemic strain (Vp024), or a non-pandemic strain (Vp029) at different time points. (C) Chart showing the percentages of ROS levels. The reported values are the means ± SEM of three independent experiments.

Mentions: Furthermore, surprisingly, the intracellular ROS levels in Caco-2 cells infected with the Vibrio parahaemolyticus strains for different times (1, 2, 3, or 4 h after infection) were lower than those in the uninfected (control) cells (Figure 4). Therefore, several parameters related to ROS, including NO, Ca2+, pH, and MMP, were examined.


Vibrio parahaemolyticus strengthens their virulence through modulation of cellular reactive oxygen species in vitro.

El-Malah SS, Yang Z, Hu M, Li Q, Pan Z, Jiao X - Front Cell Infect Microbiol (2014)

ROS levels in Caco-2 cells. ROS levels were determined in Caco-2 cells by staining with DCFH-DA, and flow cytometric analysis. (A) ROS levels in uninfected cells (control) and in cells infected with all strains at each specific time points. (B) ROS levels in uninfected cells and cells infected with RIMD, a pandemic strain (Vp024), or a non-pandemic strain (Vp029) at different time points. (C) Chart showing the percentages of ROS levels. The reported values are the means ± SEM of three independent experiments.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4269196&req=5

Figure 4: ROS levels in Caco-2 cells. ROS levels were determined in Caco-2 cells by staining with DCFH-DA, and flow cytometric analysis. (A) ROS levels in uninfected cells (control) and in cells infected with all strains at each specific time points. (B) ROS levels in uninfected cells and cells infected with RIMD, a pandemic strain (Vp024), or a non-pandemic strain (Vp029) at different time points. (C) Chart showing the percentages of ROS levels. The reported values are the means ± SEM of three independent experiments.
Mentions: Furthermore, surprisingly, the intracellular ROS levels in Caco-2 cells infected with the Vibrio parahaemolyticus strains for different times (1, 2, 3, or 4 h after infection) were lower than those in the uninfected (control) cells (Figure 4). Therefore, several parameters related to ROS, including NO, Ca2+, pH, and MMP, were examined.

Bottom Line: Our results show that Vp adheres to cell monolayers and can invade non-phagocytic cells.It also survives and persists in non-phagocytic cells by modulating reactive oxygen species (ROS), allowing its replication, and resulting in complete cellular destruction.We conclude that the pathogenicity of Vp is based on its capacities for adhesion and invasion.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University Yangzhou, China.

ABSTRACT
Vibrio parahaemolyticus (Vp) is one of the emergent food-borne pathogens that are commensally associated with various shellfish species throughout the world. It is strictly environmental and many strains are pathogenic to humans. The virulent strains cause distinct diseases, including wound infections, septicemia, and most commonly, acute gastroenteritis, which is acquired through the consumption of raw or undercooked seafood, especially shellfish. Vp has two type three secretion systems (T3SSs), which triggering its cytotoxicity and enterotoxicity via their effectors. To better understand the pathogenesis of Vp, we established a cell infection model in vitro using a non-phagocytic cell line. Caco-2 cells were infected with different strains of Vp (pandemic and non-pandemic strains) and several parameters of cytotoxicity were measured together with adhesion and invasion indices, which reflect the pathogen's virulence. Our results show that Vp adheres to cell monolayers and can invade non-phagocytic cells. It also survives and persists in non-phagocytic cells by modulating reactive oxygen species (ROS), allowing its replication, and resulting in complete cellular destruction. We conclude that the pathogenicity of Vp is based on its capacities for adhesion and invasion. Surprisingly's; enhanced of ROS resistance period could promote the survival of Vp inside the intestinal tract, facilitating tissue infection by repressing the host's oxidative stress response.

Show MeSH
Related in: MedlinePlus