CD8
Noun: A type of protein found on the surface of certain immune cells, primarily cytotoxic T cells. It acts as a co-receptor that helps these cells recognize and respond to infected or abnormal cells in the body.
CD8 is a specialized scientific term used in immunology and medicine. It is typically used as a noun to refer to the specific protein marker or the type of T cell that carries it.
* The presence of CD8 on a T cell's surface identifies it as a cytotoxic T cell.
* Researchers are studying how the CD8 receptor interacts with infected cells.
- Scientific Context: "The patient's blood test showed a high count of T cells, indicating an active immune response."
- Research Context: "The virus has evolved mechanisms to downregulate expression on infected cells to evade detection."
- Medical Context: "Certain immunotherapies aim to enhance the function of -positive lymphocytes."
- As a cell classifier: The term is often used adjectivally in compound forms to classify cell types (e.g., cell, lymphocyte, -positive T cell). These are considered standard technical terms in the field.
- In compound terminology: It forms the basis for related terms like + (pronounced "C D eight positive"), which is shorthand for a cell that expresses the CD8 protein.
- CD8+ (adj): A common notation meaning "CD8-positive," used to describe cells that have the CD8 protein on their surface.
- Cytotoxic T lymphocyte (CTL): The primary type of immune cell that carries CD8; these two terms are closely associated.
- T cell receptor (TCR): The main receptor on T cells that works in conjunction with the CD8 co-receptor.
- Cluster of Differentiation 8: The formal, full name for CD8.
- T8 (less common): An older synonym.
This word has a single, highly specific meaning in biomedical science. It does not have different general meanings, idioms, or phrasal verbs. Its usage is confined to technical discussions in immunology, virology, cancer research, and clinical medicine.
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a membrane glycoprotein that is found primarily on the surface of cytotoxic T cells
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