Virulence Mechanisms in Vibrio Cholerae
Summary
Vibrio cholerae, the causative agent of cholera, employs a sophisticated array of virulence factors to colonise the human small intestine, evade host defences and facilitate transmission. Central to its pathogenicity is the cholera toxin (CT), an AB5 enterotoxin that disrupts ion transport in enterocytes, provoking profuse watery diarrhoea. Expression of CT is controlled by the ToxR regulatory cascade and depends on the toxin-coregulated pilus (TCP), which mediates microcolony formation on the mucosal surface. Beyond these hallmarks, V. cholerae harnesses a type VI secretion system (T6SS) for interbacterial competition and host interaction, and employs quorum sensing to coordinate transitions between virulent and environmental lifestyles. Biofilm formation on chitinous surfaces and in aquatic reservoirs bolsters environmental persistence, while two-component systems and nucleoid-structuring proteins fine-tune gene expression in response to bile, pH and nutrient cues. Adaptive metabolic programmes allow the pathogen to exploit host-derived substrates and modulate intestinal immunity. Host factors such as mucin secretion and innate immune activation further influence colonisation efficiency. Integrating environmental sensing, regulatory networks and metabolic adaptation, V. cholerae balances virulence and survival to sustain its global impact, underscoring the need for novel interventions targeting key nodes in these interconnected pathways.
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Virulence Mechanisms in Vibrio Cholerae publication trend
The graph below shows the total number of articles in virulence mechanisms in vibrio cholerae across all publications each year (not limited to Nature Index journals).
Technical terms
Cholera toxin (CT): An AB5 enterotoxin secreted by V. cholerae that induces chloride and water efflux in the small intestine, causing diarrhoea.
Toxin-coregulated pilus (TCP): A filamentous appendage essential for microcolony formation on intestinal epithelium and for coordinating toxin gene expression.
Type VI secretion system (T6SS): A contractile apparatus used to inject effector proteins into rival bacteria or host cells, promoting niche establishment.
Quorum sensing: A cell-density-dependent communication system in which bacteria produce, release and detect chemical signals to regulate gene expression collectively.
Biofilm: A multicellular community of bacteria encased in an extracellular matrix, enhancing resistance to environmental stress and antimicrobials.
References
- The intersection between host–pathogen interactions and metabolism during Vibrio cholerae infection. Current Opinion in Microbiology (2024).
- Virulence Regulation and Innate Host Response in the Pathogenicity of Vibrio cholerae. Frontiers in Cellular and Infection Microbiology (2020).
- Pathogenicity and virulence regulation of Vibrio cholerae at the interface of host-gut microbiome interactions. Virulence (2020).
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