Immune cells and immune mediators

Immune cells and immune mediators represent the collective cellular and molecular elements of the immune system responsible for host defense and tissue homeostasis. This broad category includes various leukocyte populations—such as T cells, B cells, natural killer cells, and macrophages—alongside the signaling molecules they secrete, including cytokines, chemokines, and interferons (StatPearls, 2023; NIH, 2024). These components coordinate complex responses to pathogens, toxins, and malignant cells through intricate signaling networks. In clinical medicine, dysregulation of these mediators is central to the pathogenesis of autoimmune disorders, chronic inflammation, and cancer progression (PubMed, 2023). While many drugs are designed to modulate specific pathways within this system, the term itself describes a functional network rather than a single druggable molecule. Consequently, therapeutic interventions targeting this system must be highly specific to avoid broad-spectrum immunosuppression or off-target inflammatory effects.

Other names

Immune system componentsLeukocytes and cytokinesInflammatory mediatorsImmunological factors

Inhibition of cytokine signaling, depletion of specific cell populations, blockade of immune checkpoints, and modulation of intracellular signaling pathways.