CD8 T cell

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Definition

Noun: A type of lymphocyte (white blood cell) that is a crucial component of the adaptive immune system. It is characterized by the presence of a cell surface protein called CD8. Its primary function is to identify and destroy cells in the body that have been infected by viruses or that have become cancerous.

Usage

This term is used in medical, biological, and immunological contexts to describe a specific subset of T lymphocytes (T cells). * The cd8 t cell is often called a "killer T cell" or "cytotoxic T lymphocyte" (CTL) because of its function. * When a virus infects a cell, the cell displays fragments of the virus (antigens) on its surface. The cd8 t cell recognizes these antigens and binds to the infected cell. * A strong cd8 t cell response is critical for clearing viral infections.

Examples
  • Researchers are studying how to enhance the cd8 t cell response to fight cancer more effectively.
  • The vaccine was designed to stimulate the body's production of memory cd8 t cells.
  • In patients with a weakened immune system, the activity of cd8 t cells may be reduced.
Advanced Usage
  • CD8+ T cell: This is a more precise notation, where the "+" symbol indicates the presence of the CD8 protein on the cell's surface.
  • Cytotoxic CD8 T cell: Emphasizes the cell-killing (cytotoxic) function of this lymphocyte.
  • CD8 T cell exhaustion: A state of dysfunction that can occur in chronic infections or cancer, where the T cells lose their ability to effectively kill target cells.
Variants and Related Words
  • Cytotoxic T lymphocyte (CTL): A direct synonym.
  • Killer T cell: A common informal name.
  • CD4 T cell: Another major type of T helper cell, which assists immune responses including those of CD8 T cells.
  • T cell / T lymphocyte: The broader category of white blood cells to which CD8 T cells belong.
Synonyms
  • Cytotoxic T lymphocyte (CTL)
  • Killer T cell
  • CD8+ lymphocyte
Related Phrases
  • CD8 T cell response: The collective activity and proliferation of these cells in reaction to an antigen.
  • CD8 T cell-mediated immunity: The aspect of the immune response that is carried out primarily by CD8 T cells.
Noun
  1. T cell with CD8 receptor that recognizes antigens on the surface of a virus-infected cell and binds to the infected cell and kill it

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