What is the CD marker for CD40L found on T cells?

The CD marker for CD40L, which is expressed on activated T cells, is known as CD154. CD40L plays a critical role in the immune response by interacting with CD40 on antigen-presenting cells, thereby promoting their activation and enhancing the subsequent immune response. This interaction is pivotal for T cell-dependent activation of B cells and is essential for processes like class switching and affinity maturation of antibodies.

Understanding the function of CD154 helps clarify its significance in both normal immune responses and in various immunological conditions. The other markers listed—CD32, CD19, and CD28—have distinct roles in the immune system but do not refer to CD40L. CD32 is an Fc receptor, CD19 is a pan-B cell marker, and CD28 is a co-stimulatory molecule crucial for T cell activation. Each marker has its unique functions, but none correlate with the CD40L function like CD154 does.