Innate immune system cells

The innate immune system represents the body's immediate, non-specific defense mechanism against pathogens and foreign substances (StatPearls, 2023). It is composed of diverse cell populations, including macrophages, neutrophils, dendritic cells, and natural killer (NK) cells, which utilize pattern recognition receptors (PRRs) to detect conserved microbial motifs (NIH, 2022). These cells are essential for initiating inflammatory responses, performing phagocytosis, and bridging the gap to adaptive immunity via antigen presentation (Nature Reviews Immunology, 2021). In disease contexts, overactive innate immune cells drive chronic inflammatory conditions and tissue damage, while their suppression within the tumor microenvironment can facilitate cancer progression (PubMed, 2020). Although innate immune cells are a broad category rather than a single molecular target, many drugs modulate these cells; for instance, Toll-like receptor (TLR) agonists are used as vaccine adjuvants to enhance innate activation, whereas corticosteroids provide broad immunosuppression by inhibiting inflammatory gene expression across these cell types (PubChem, 2023).

Other names

Innate immunityNon-specific immune systemInnate immune effectorsMyeloid and NK cell populations

Modulation of innate immune cell recruitment, activation, or effector functions through various molecular pathways including PRR signaling and cytokine modulation.