Naïve helper T cells

Definition

Naïve helper T cells are a subset of T cells that have not yet encountered their specific antigen. They play a crucial role in the adaptive immune response by differentiating into various types of effector T cells upon activation.

5 Must Know Facts For Your Next Test

1. They originate from the thymus and circulate in peripheral lymphoid organs.
2. Upon encountering an antigen, they differentiate into effector helper T cells, such as Th1, Th2, or Th17.
3. Their activation requires two signals: antigen presentation and co-stimulatory signals from antigen-presenting cells (APCs).
4. They express the surface marker CD4, which assists in recognizing antigens presented by MHC class II molecules.
5. They are essential for orchestrating both cellular and humoral immunity by helping activate other immune cells.

Related terms

Effector Helper T Cells: Differentiated form of naïve helper T cells that help activate other immune cells.

Antigen-Presenting Cells (APCs):

Cells that display antigens on their surface to naïve helper T cells, initiating their activation.

Major Histocompatibility Complex (MHC) Class II: Molecules on APCs that present antigens to CD4+ naïve helper T cells.