quel le rôle des interleukine? (what is the role of interleukins?)

They play a crucial role in the immune system, acting as chemical messengers that coordinate communication between different immune cells. They are essential for orchestrating a complex and multifaceted immune response. They play a critical role in various immune functions, including:
Fighting off infections caused by bacteria, viruses, and other pathogens

Cytokine is a general term used for small secreted proteins that are key modulators of inflammation. Cytokines are produced in response to invading pathogens to stimulate, recruit, and proliferate immune cells. Cytokines includes interleukins (IL), chemokines, interferons, and tumor necrosis factors (TNF). Cytokines are subdivided based on the nature of the immune response and the source of their production. From my research interest imbalance between pro- inflammatory and anti- inflammatory   cytokines are contributing in many diseases. Recently pro- inflammatory cytokines are related to all diseases through the gut microbiota- organ axis as hot point of research. Interestingly pro inflammatory cytokines and impaired gut microbiota was scientifically accepted to be involved in COVID-19 complications or “ long covid -19

These are signaling mediators responsible for cellular functioning. Important issue, poorly analyzed in humans. 
Best

Interleukins are a group of signaling molecules produced by various body immune cells, such as T cells, B cells, and macrophages. They play a critical role in regulating the immune response, including the activation, proliferation, and differentiation of immune cells. Some interleukins, such as IL-1 and IL-6, can also promote inflammation in the body, which is an important part of the immune response to pathogens. Overall, interleukins play a crucial role in regulating the immune response, and imbalances in their production or activity can contribute to various diseases, including autoimmune disorders and cancer.