Journal of Research in Microbiology and Immunology ISSN: 3108-0952 (Online)

Authors :Dr. Anjali Menon, Dr. Vikram Singh

Abstract: Bacterial quorum sensing (QS) is a cell-density-dependent communication mechanism that regulates gene expression, biofilm formation, virulence factor production, and immune evasion. QS allows bacteria to sense environmental cues and coordinate collective behavior, enhancing survival in hostile host environments. Immune evasion strategies, including modulation of host cytokine responses, inhibition of phagocytosis, and secretion of immunosuppressive molecules, are often controlled by QS circuits. This paper explores molecular mechanisms of QS in Gram-positive and Gram-negative bacteria, links QS pathways to immune evasion, and discusses potential therapeutic strategies targeting QS systems. Tables summarizing key QS molecules, bacterial species, and immune evasion mechanisms are included. Understanding QS-mediated immune modulation provides novel insights into controlling bacterial infections and developing anti-virulence therapies.

Keywords: Quorum sensing, Bacterial communication, Virulence factors, Immune evasion, Biofilm formation, Anti-virulence therapy, Pathogen survival