Innate immune pattern recognition pathways activated by Listeria monocytogenes infection

The innate immune pattern recognition pathways activated by Listeria monocytogenes infection represent a complex network of host defense mechanisms designed to detect and eliminate this intracellular Gram-positive pathogen. Upon entry into host cells, Listeria is recognized by various pattern recognition receptors (PRRs), including Toll-like receptor 2 (TLR2) on the cell surface and several cytosolic sensors such as NOD1, NOD2, and the cGAS-STING pathway (KEGG: map05133). The bacterium's escape from the phagosome into the cytosol, mediated by the toxin listeriolysin O (LLO), triggers the activation of the NLRP3 and AIM2 inflammasomes, leading to the maturation of pro-inflammatory cytokines like IL-1β and IL-18 and the induction of pyroptotic cell death (Nature Reviews Microbiology, 2017). These pathways are critical for orchestrating the initial immune response and shaping subsequent adaptive immunity. While these pathways are not a single therapeutic target, they are of significant interest in clinical settings where dysregulated inflammation during listeriosis, particularly in the central nervous system, requires pharmacological modulation. Drugs interacting with this system typically include antibiotics to remove the bacterial stimulus or anti-inflammatory agents to mitigate the collateral damage caused by hyper-activation of these innate signaling cascades (PubMed: 28263922).

Other names

Listeria monocytogenes infection pathwayInnate immune response to ListeriaListeriosis signaling pathwayKEGG: map05133

Antibiotics like Ampicillin and Gentamicin target the bacterial trigger (Listeria monocytogenes) by inhibiting cell wall synthesis or protein synthesis, thereby preventing pathway activation (StatPearls, 2023). Corticosteroids like Dexamethasone and IL-1 inhibitors like Anakinra modulate the downstream inflammatory output of these pathways to prevent tissue damage in severe infections such as meningitis (PubMed: 23439458).