CD4 cell

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Definition

Noun: A type of white blood cell (a T cell) that carries the CD4 protein receptor on its surface. Its primary role is to help coordinate the immune system's response by recognizing infected cells and signaling other immune cells to act.

Usage

This term is used specifically in immunology and medicine. * The HIV virus specifically targets and destroys cd4 cells, weakening the immune system. * A standard blood test measures a person's cd4 cell count to monitor immune health.

Advanced Usage
  • "cd4 cell count": A critical clinical measurement indicating the number of these cells in a cubic millimeter of blood, used to assess immune system strength, especially in HIV management.
    • A declining cd4 cell count is a sign of HIV progression.
Variants and Related Words
  • Helper T cell: The more common biological name for a cd4 cell.
  • CD4+ T lymphocyte: A formal, equivalent term.
  • CD8 cell: A different type of T cell (cytotoxic T cell) that destroys infected cells.
Synonyms
  • Helper T cell
  • CD4+ T lymphocyte
  • T-helper cell
Related Terms (Not Synonyms)
  • T cell: The broader category of white blood cells that includes cd4 cells.
  • Lymphocyte: The general type of white blood cell that includes all T cells and B cells.
  • HIV/AIDS: The disease context where cd4 cells are most frequently discussed.
Noun
  1. T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells; helper T cells are infected and killed by the AIDS virus

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