What additional cells are stimulated by IL-2 apart from T helper cells?

What additional cells are stimulated by IL-2 apart from T helper cells?

• A. B cells and macrophages
• B. NK cells and T cytotoxic cells
• C. Dendritic cells and monocytes
• D. Neutrophils and eosinophils

Answer: (B)

Interleukin-2 (IL-2) plays a crucial role in the immune response, particularly in the proliferation and activation of various types of lymphocytes. While T helper cells are a primary target of IL-2, this cytokine also stimulates the activity and proliferation of natural killer (NK) cells and T cytotoxic cells.

NK cells are vital components of the innate immune system and are involved in responding to virally infected cells and tumor cells. Upon stimulation by IL-2, NK cells enhance their cytotoxic capabilities and proliferation, becoming more effective in their immune surveillance roles.

T cytotoxic cells, on the other hand, are essential for adaptive immunity. IL-2 promotes their growth, differentiation, and activation, allowing them to effectively target and kill infected or cancerous cells. The presence of IL-2 signals to these cells to divide and expand in number, which amplifies the immune response.

This dual action of IL-2 on NK cells and T cytotoxic cells underscores its important role in bridging innate and adaptive immunity, facilitating a more robust immune response.