Immune cells and cytokines

Immune cells and cytokines encompass the diverse array of cellular lineages and signaling proteins that constitute the vertebrate immune system (NIH, 2023). Immune cells, including lymphocytes, myeloid cells, and granulocytes, serve as the primary effectors of innate and adaptive immunity, while cytokines act as the essential chemical messengers—such as interleukins and interferons—that regulate cell growth, differentiation, and activation (StatPearls, 2023). This broad category is fundamental to the pathophysiology of numerous conditions, including autoimmune diseases, infectious diseases, and various cancers where immune evasion or overactivation occurs (Nature Reviews Immunology, 2021). In pharmacology, this term does not refer to a single therapeutic target but rather a complex network of potential targets, such as specific interleukins or cell-surface receptors. Drugs like monoclonal antibodies and small molecule inhibitors are designed to modulate specific components within this system to restore immune homeostasis. Because it aggregates thousands of distinct molecular entities and cell types, it is classified as a general biological system rather than a specific druggable receptor or enzyme. Consequently, it is considered an imprecise and overly broad designation for a therapeutic target in a drug discovery context.

Other names

Immune system componentsLeukocytes and inflammatory mediatorsImmune effectors

Not applicable as this is a broad biological category rather than a specific molecular target; drugs interacting with this system employ diverse mechanisms such as cytokine neutralization, receptor blockade, and lymphocyte depletion.