Encyclopedia > T-cell

  Article Content

T cell

Redirected from T-cell

T cells are a subset of lymphocytes[?] that play a large role in the primary immune response[?]. The abbreviation "T" stands for thymus, the organ in which their final stage of their development occurs.

There are many types of T cells:

  • Cytotoxic T cells (CD8+) destroy infected cells. These cells function as 'killer' or cytotoxic cells because they are able to destroy target cells which express specific antigens that they recognize.
  • Helper T cells (CD4+) are "middlemen" in the immune response and proliferate to activate many other types of cells which act more directly in the response. CD4+ T cells regulate or 'help' other lymphocyte function. They are known as the target of HIV infection, and the decrease of CD4+ T cells results in AIDS.
  • Suppressor T cells turn off the immune response once an antigen has been eliminated from the body.

Cell-mediated immunity[?] (the immune response against pathogenic organisms inside body cells) involves T cell activation.

See also:

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article

... The president has extensive executive powers and is both head of state and head of government and he also appoints the cabinet. The Brazilian parliament, the bicameral ...

This page was created in 23.7 ms