Which cytokine is critical for T cell proliferation and activation?

Which cytokine is critical for T cell proliferation and activation?

• A. IL-1
• B. IL-6
• C. IL-2
• D. IL-12

Answer: (C)

IL-2 is the cytokine that plays a crucial role in the proliferation and activation of T cells. After T cells are activated by their specific antigen, they begin to produce IL-2, which then acts in an autocrine and paracrine manner to promote their own growth and the growth of neighboring T cells. This process enhances the immune response by allowing for a rapid expansion of T cells, which are essential for the elimination of pathogens and the development of an effective adaptive immune response. IL-2 is often referred to as a growth factor for T cells, underscoring its importance in T cell biology. This unique ability of IL-2 to stimulate T cell proliferation makes it a key player in immune regulation and response.