Broad immune system

The immune system is a complex, multi-layered network of cells (such as lymphocytes and phagocytes), tissues (like the spleen and thymus), and soluble factors that protect the host from pathogenic organisms and provide surveillance against neoplastic cells (Source: NIH, Overview of the Immune System). It is broadly divided into the innate immune system, providing rapid, non-specific responses, and the adaptive immune system, which generates highly specific, memory-based protection. In clinical pharmacology, the broad immune system is not considered a single therapeutic target but rather a physiological system containing thousands of distinct molecular targets, including G protein-coupled receptors, enzymes, and cytokines. Dysregulation of this system is central to the pathogenesis of numerous conditions, ranging from rheumatoid arthritis and multiple sclerosis to sepsis and various cancers (Source: StatPearls, Immune System). Therapeutic strategies involve immunomodulation, where drugs either suppress an overactive response (immunosuppressants) or enhance a deficient one (immunotherapy). Because of the system's interconnected nature, broad modulation often carries significant risks, such as severe infection or the development of lymphoma (Source: Merck Manual, Overview of the Immune System).

Other names

Immune systemHost defense systemLymphatic system

Not applicable as a single molecular mechanism; drugs targeting the immune system act via diverse pathways including cytokine inhibition, lymphocyte depletion, and checkpoint blockade (Source: StatPearls, Physiology, Immune Response).