IL-17 (Interleukin-17)

Interleukin-17 (IL-17) is a type of signaling protein, called a cytokine, produced mainly by immune cells. It plays a crucial role in protecting the body against bacterial and fungal infections by activating other immune responses. However, IL-17 can also contribute to inflammation and has been linked to certain autoimmune conditions, where the immune system mistakenly attacks the body's own tissues. In these cases, IL-17's activity can become unbalanced, leading to chronic inflammation and tissue damage. Overall, IL-17 is essential for immune defense but must be carefully regulated to prevent harm.