Streptococcal mitogenic exotoxin

Definition

Streptococcal mitogenic exotoxin is a protein toxin produced by Streptococcus bacteria that stimulates T lymphocyte division and can lead to an excessive immune response. It plays a significant role in diseases caused by streptococcal infections.

5 Must Know Facts For Your Next Test

1. The toxin can act as a superantigen, triggering an overwhelming activation of T cells.
2. It is implicated in the pathogenesis of severe infections such as streptococcal toxic shock syndrome (STSS).
3. Streptococcal mitogenic exotoxins bypass normal antigen processing, leading to non-specific polyclonal T cell activation.
4. This exotoxin can cause massive cytokine release, resulting in inflammation and tissue damage.
5. Understanding its mechanisms helps in developing targeted therapies for streptococcal infections.

Related terms

Superantigen: A class of antigens that result in excessive activation of the immune system.

Cytokine Storm:

A severe immune reaction where the body releases too many cytokines into the blood too quickly.

T Lymphocytes:

A type of white blood cell that is essential for the immune system, particularly in identifying and killing infected host cells.