T lymphocyte
T cell T" cell` (t[=e]"s[e^]l`) [From Thymus, the site of maturation of T-cells.] A type of white blood cell that circulates in the blood and lymph, and provides cell-mediated immunity for the organism, protecting against infecting cells or the body's own malignant cells; also called {T lymphocyte}. There are several types of T cells. They develop, as do B cells, from progenitor cells in the bone marrow, but are distinguished from B-cells (B-lymphocytes) by their site of differentiation; T-cells mature in the thymus and B-cells in the bone marrow (in birds in the Bursa of Fabricius). They also have different antigen receptors from those of B-cells. T-cells differentiate into cells that can directly kill infecting cells (cell-mediated immunity, cytotoxity) or activate other cells of the immune system (helper T cells), whereas B-cells differentiate on activation into antibody-secreting plasma cells. Helper T cells interact with B-cells by secreting lymphokines that stimulate the B cell which have detected a foreign antigen to enter the cell cycle and develop, by repeated mitosis, into a clone of cells with identical receptors, and then to secrete antibodies to that specific antigen. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • T lymphocyte — T lym pho*cyte Same as {T cell}. [PJC] …   The Collaborative International Dictionary of English

  • T-lymphocyte — Tˈ lymphocyte noun A T cell • • • Main Entry: ↑T …   Useful english dictionary

  • T lymphocyte — tē n T CELL …   Medical dictionary

  • T lymphocyte — n. T CELL …   English World dictionary

  • T lymphocyte — noun a small lymphocyte developed in the thymus; it orchestrates the immune system s response to infected or malignant cells • Syn: ↑T cell • Hypernyms: ↑lymphocyte, ↑lymph cell • Hyponyms: ↑helper T cell, ↑he …   Useful english dictionary

  • T-lymphocyte — noun Physiology a lymphocyte of a type produced or processed by the thymus gland and participating in the cell mediated immune response. Compare with B lymphocyte. Origin 1970s: from T for thymus …   English new terms dictionary

  • T-lymphocyte — n. see lymphocyte …   Medical dictionary

  • T-lymphocyte — n.; see lymphocyte …   The new mediacal dictionary

  • T lymphocyte — One type of white blood cell that attacks virus infected cells, foreign cells, and cancer cells. T lymphocytes also produce a number of substances that regulate the immune response. Also called T cell …   English dictionary of cancer terms

  • T lymphocyte — noun Etymology: thymus derived Date: 1972 T cell …   New Collegiate Dictionary

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