Cytotoxic T Cell - English Definition & Meaning

Definition

A cytotoxic T cell, also known as a killer T cell or CD8+ T cell, is a type of T lymphocyte that directly kills infected or cancerous cells. Think of them as the elite soldiers of your immune system, programmed to eliminate threats with lethal precision. 🔪 They recognize specific antigens presented on the surface of target cells and release toxic substances that trigger apoptosis (programmed cell death). Cytotoxic T cells are essential for controlling viral infections and preventing the spread of cancer. They are a key component of cell-mediated immunity.

Etymology

The term "cytotoxic T cell" combines "cyto-" (referring to cell) with "toxic" (referring to poisonous or destructive), indicating that these cells are toxic to other cells. "T cell" refers to their origin in the thymus. The term "CD8+ T cell" refers to the presence of the CD8 protein on their surface. Thus, a cytotoxic T cell is a type of T cell characterized by its ability to kill other cells and the presence of the CD8 protein.

Related Words

Examples

• "Cytotoxic T cells recognize and kill virus-infected cells."
• "Cytotoxic T cells play a crucial role in preventing cancer metastasis."
• "The activation of cytotoxic T cells is essential for controlling viral infections."
• "Immunotherapies can enhance the activity of cytotoxic T cells to fight cancer."

Encouragement

Cytotoxic T cells are the precise eliminators of your immune system, protecting you from harmful threats! Keep learning about them and appreciate their vital role in your health. Understanding your immune system empowers you to make healthy choices! 💪

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