Interleukins are proteins that facilitate communication between cells, particularly in the immune system. They are involved in regulating cell growth, differentiation, and motility, and are essential for initiating and modulating immune responses, including inflammation. The human genome encodes over 50 interleukins, each with specific roles in immune regulation and other biological functions.

Functions of Interleukins

Interleukins exert their effects by binding to specific receptors on target cells, triggering intracellular signaling pathways that alter cellular behavior. Some key functions include:

• Activation of Immune Cells: Interleukins such as IL-1 and IL-2 are vital for activating T and B lymphocytes, which are crucial for adaptive immunity. IL-2, for example, promotes the proliferation and differentiation of T cells, while IL-1 enhances the activation of various immune cells.
• Regulation of Inflammation: Interleukins are central to the inflammatory response. IL-1 and IL-6 are known to mediate fever and acute phase responses, while other interleukins can either promote or inhibit inflammation depending on the context.
• B-cell Differentiation: IL-4 and IL-5 are important for B-cell growth and differentiation, influencing antibody production and class switching, which are essential for effective immune responses.