Final answer:
CD4+ helper T cells and antigen-presenting cells are known to release interleukin-2 (IL-2) when they interact during an immune response, aiding in the proliferation and differentiation of T cells and contributing to immune system activation.
Step-by-step explanation:
Types of Cells Releasing Interleukin-2
One type of cell that releases interleukin-2 (IL-2) is the CD4+ helper T cell. During an immune response, when a CD4+ helper T cell binds to the major histocompatibility complex (MHC) II-antigen complex on an antigen-presenting cell (APC), both the APC and the T cell release cytokines, including IL-2. Interleukin-2 is crucial for the proliferation and differentiation of T cells, which are essential components of the adaptive immune response. IL-2 plays a significant role in immunity and inflammation, stimulating the growth of T cells and natural killer (NK) cells, thereby promoting a robust immune response against pathogens. Additionally, other lymphocytes, such as activated B cells, can also contribute to the release of certain types of interleukins.
The interleukin-2 (IL-2) is released by CD4+ helper T cells when they bind to the MHC II-antigen complex on an antigen-presenting cell. This activation leads to the release of cytokines by both the antigen-presenting cell and the T cell. IL-2 plays a key role in the immune response by promoting the proliferation and activation of other immune cells, such as cytotoxic T cells and natural killer cells.