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Updated: Jul 10, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
Published on: February 19, 2019
Beyond bacterial communication: host factors that modulate quorum sensing and virulence in human pathogens
1University of Bejaia, Microbial Ecology Laboratory, FSNV, Bejaia, Algeria.
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Quorum sensing (QS) coordinates collective bacterial behavior, but during infection, its activity is also shaped by host biology. This review examines how host-derived factors modulate QS-linked virulence in enteric pathogens, Pseudomonas aeruginosa and Staphylococcus aureus. Across these systems, host control operates through three recurring modes: activation or signal mimicry, enzymatic signal degradation, and extracellular sequestration or receptor-level interference. Catecholamines and related metabolites can feed into bacterial sensory pathways and promote virulence signaling; PONs (paraoxonases) and other host enzymes can degrade autoinducers; and lipoproteins, immune mediators, and epithelial surveillance systems can intercept or reinterpret quorum signals. Together, these data support the view that the host is an active signal-processing environment that reshapes colonization, persistence, and tissue damage, and they point to host-inspired anti-virulence strategies that target signaling rather than viability.
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