IL-5 (Interleukin 5)

Interleukin-5 (IL-5) is a protein, or cytokine, produced mainly by certain immune cells like T cells and mast cells. It plays a key role in the body's immune response by specifically targeting and activating eosinophils, a type of white blood cell involved in defending against parasites and contributing to allergic reactions. When IL-5 levels increase, it promotes the growth and activation of eosinophils, which can lead to inflammation, especially in conditions like asthma or allergies. Therefore, IL-5 is important in managing immune responses and inflammatory processes related to allergies and asthma.