Interleukin-4 (IL-4)

Interleukin-4 (IL-4) is a signaling protein, known as a cytokine, produced by immune cells. It plays a key role in the immune system by helping certain cells, such as T helper 2 cells, B cells, and mast cells, communicate. IL-4 promotes the production of antibodies that target specific pathogens and influences the balance between different immune responses, particularly encouraging a response associated with allergy and defense against parasites. Overall, IL-4 is essential for regulating immune activity and maintaining immune system balance.