Question

Which of the following properties is NOT exhibited by TH cells?

• A. Stimulate division of B cells
• B. Are cytotoxic for other cells
• C. Stimulate division of cytotoxic T cells
• D. Stimulate migration of macrophages

Hint:

Helper T cells are key for activating and coordinating other cells. Cytokines are secreted by helper T cells, which act as messengers for various cells of the immune system. Cy-totoxic T cells directly destroy infected or cancerous cells, by using mechanisms such as perforin and granzyme.

Answer 1

The Correct Option is B

Helper T (TH) cells are a type of white blood cell crucial for adaptive immune responses. Key functions include:
• Promoting B cell proliferation and differentiation into antibody-producing plasma cells.
• Activating and expanding cytotoxic T (Tc) cells via cytokines. Tc cells are responsible for directly eliminating infected or tumor cells.
• Enhancing macrophage phagocytic and microbicidal activity through cytokines.
TH cells themselves are not cytotoxic. Cytotoxicity is a primary function of cytotoxic T cells, not helper T cells. Cytotoxic T cells have CD8+ receptors, whereas TH cells have CD4+ receptors.