Self-antigen epitopes

Definition

Self-antigen epitopes are fragments of proteins or other molecules from an individual's own cells that are presented by major histocompatibility complex (MHC) molecules. They play a crucial role in the immune system's ability to distinguish between self and non-self.

5 Must Know Facts For Your Next Test

1. Self-antigen epitopes are critical for maintaining self-tolerance and preventing autoimmune reactions.
2. They are presented on the surface of cells by MHC class I and II molecules.
3. T cells recognize these epitopes through their T cell receptors (TCRs), which helps in immune surveillance.
4. Failure to properly present self-antigens can lead to autoimmune diseases, where the body attacks its own tissues.
5. Regulatory T cells (Tregs) help in maintaining tolerance to self-antigens by suppressing autoreactive T cells.

Review Questions

Related terms

Major Histocompatibility Complex (MHC):

A set of cell surface proteins essential for acquired immune system recognition of foreign molecules.

Antigen-Presenting Cells (APCs):

Cells that process and present antigens to T-cells, initiating an immune response.

Regulatory T Cells (Tregs): A subset of T cells that maintain tolerance to self-antigens and prevent autoimmune disease.