Which receptor type is associated with T cytotoxic cells?

Which receptor type is associated with T cytotoxic cells?

• A. CD-4
• B. CD-8
• C. CD-3
• D. CD-28

Answer: (B)

T cytotoxic cells, also known as cytotoxic T lymphocytes (CTLs), are primarily associated with the CD-8 receptor. This receptor is essential for the function and activation of cytotoxic T cells, allowing them to recognize and bind to antigens presented on the surface of infected or cancerous cells in conjunction with MHC class I molecules. The presence of CD-8 enables these T cells to carry out their primary role in the immune response, which includes directly killing infected or aberrant cells to help control infections or eliminate tumors.

The other receptor types, such as CD-4, are associated with a different subset of T cells called helper T cells, which assist in the immune response but do not directly kill infected cells. CD-3 is a signal transduction molecule found on all T cells that plays a critical role in T cell activation, while CD-28 is a co-stimulatory receptor that provides necessary secondary signals for T cell activation. Each of these molecules has distinct roles, highlighting the specialized functions of different T cell types in the immune system.