T-dependent antigens

Definition

T-dependent antigens are antigens that require assistance from T-helper cells to induce a B-cell response and the production of antibodies. These antigens typically have protein components that are presented to T-cells via MHC class II molecules.

5 Must Know Facts For Your Next Test

1. T-dependent antigens necessitate the involvement of CD4+ T-helper cells for a robust immune response.
2. Upon recognition, B-cells present antigen fragments on MHC class II molecules to T-helper cells.
3. Cytokines released by T-helper cells provide essential signals for B-cell activation, proliferation, and differentiation.
4. Antibody affinity maturation and isotype switching primarily occur in responses to T-dependent antigens.
5. Vaccines often use T-dependent antigens to elicit strong, long-lasting immunity.

Review Questions

Related terms

MHC Class II Molecules: Proteins on antigen-presenting cells that display processed antigens to CD4+ T-helper cells.

Cytokines:

Signaling proteins released by cells, particularly immune cells, that influence cell behavior and modulate the immune response.

Affinity Maturation:

The process by which B-cells produce antibodies with increased binding affinity for their specific antigen through somatic hypermutation and selection.