CD4 T cell

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Definition

Noun: A type of white blood cell (a T lymphocyte) that carries the CD4 protein on its surface. It plays a central role in coordinating the immune system's response by helping to activate other immune cells, such as B cells and killer T cells. These cells are the primary target of the Human Immunodeficiency Virus (HIV).

Usage

This is a specialized scientific and medical term. - It is used to describe a specific component of the immune system. - It is often discussed in the context of immunology, HIV/AIDS research, and patient health monitoring (e.g., CD4 count).

Examples
  • Noun:
    • A low cd4 t cell count is a key indicator of a weakened immune system in HIV-positive individuals.
    • The virus primarily infects and destroys cd4 t cells, compromising the body's ability to fight infections.
    • Researchers are studying how to protect cd4 t cells from viral attack.
Advanced Usage
  • "CD4+ T cell": An alternative notation using a plus sign to indicate the presence of the CD4 receptor.
  • "Helper T cell": A common synonym for this type of cell, emphasizing its coordinating function in the immune response.
Variants and Related Words
  • Helper T cell (n): The most common synonym for a cd4 t cell.
  • CD4 cell (n): A frequently used shorter form, though it can sometimes refer more broadly to any cell with the CD4 receptor (including some macrophages).
  • CD4 count (n): A clinical measurement of the number of cd4 t cells in a cubic millimeter of blood, used to monitor HIV disease progression.
  • T lymphocyte / T cell (n): The broader category of white blood cells to which cd4 t cells belong.
Synonyms
  • Helper T cell
  • Helper T lymphocyte
  • CD4+ lymphocyte
Notes on Meaning

This term has a single, precise meaning in immunology and medicine. It refers specifically to the subset of T lymphocytes that express the CD4 glycoprotein on their surface and perform helper functions, as opposed to cytotoxic T cells (which carry the CD8 receptor).

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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