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.
T cells are lymphocytes that are produced in the bone marrow and mature in the thymus. T cells are responsible for mediating the second branch of the immune system called "cellular immune response." T cells can live for months to years. This lymphocyte population is defined by the presence of a rearranged T-cell receptor.
Subset of lymphocytes defined by their development in the thymus and by heterodimeric receptors associated with the proteins of the CD3 complex. T cells are the central players in the adaptive cell-mediated immunity.
A type of lymphocyte, involved in the cellular immune response. The final stages of its development occur in the thymus gland. (Contrast with B cell; see also cytotoxic T cell, helper T cell, suppressor T cell.)
a blood cell called a lymphocyte, a helper cell that controls the initiation or suppression of the human immune system.
type of lymphocyte that mainly attacks viruses
a type of white blood cell which is formed by lymphoid tissue. It is involved in cell-mediated immunity and humoral immunity. It is also known as a T lymphocyte.
a lymphocyte that originates in the bone marrow. It matures in the thymus and reacts in lymphoid tissues with foreign molecules to become one of a number of different forms which can combat infection in different ways.
A type of immune system cell which is damaged in the course of HIV infection. CD4 and CD8 cells are both sub-types of T cell.
Type of lymphocyte that, on simulation with an appropriate antigen, gives rises to a population of sensitised lymphocytes with receptor sites for that antigen on their surface membranes; so called because they are processed through the thymus; of primary importance in cell-mediated immunity.
lymphocytes that have the ability to recognize specific peptide antigens through the receptors on their cell surface. Also called T lymphocyte.
(T sell) Type of white blood cell that matures in the thymus and is essential for various aspects of immunity, especially in combating viral infections and cancers. Also called T lymphocyte.
A cell of the immune system that specializes in killing foreign cells or virus infected cells.
lymphocyte that either helps or activates other cells (T helper) or kills infected cells (cytotoxic T cell).
See also CD4 cell. T cells are white blood cells made in the thymus gland in the body. White blood cells participate in the immune system response. There are three very different types of T cells: helper, killer and suppressor. These cells are responsible for organizing certain immune responses, "policing" the immune system to find infected cells, stimulating antibodies and cell- killing T cells and then shutting down an immune response if it has effectively cleared out the invading organisms. An HIV+ person's immune system does not function properly because HIV takes over the helper CD4 cells to make more HIV, and the killer T cells (T8 or CD8 cells) continue to try to shut the immune system.
a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells
an effector cell that function in the cell-mediated immune response
a special kind of white blood cell, and the more you have, the stronger your immune system is
a type of lymphocyte, or "white blood cell", that mediates the cellular immune response to foreign macromolecule, termed antigens
a type of white blood cell used by the body to fight infection
A lymphocyte (white blood cell) that develops in the bone marrow, matures in the thymus, and works as part of the immune system in the body.
A specific type of white blood cell that starts an immune response or actively works to attack and destroy foreign substances ( antigens). Psoriasis is often considered a "T-cell–mediated" disease because T cells appear to be over-activated.
abbreviation for T lymphocytes
A type of white blood cell that is part of the immune system and normally helps protect the body against infection and disease. In psoriasis, it also can trigger inflammation and excessive skin cell reproduction.
A type of cell produced by the thymus that plays a major role in immune reactions
Specialized white blood cells that destroy cells infected by viruses.
A class of immune cells that help to bind and display foreign microbes or to destroy them.
A type of immune cell that produces special molecules that allow them to recognize and react to foreign antigens. The two main kinds of T cells are cytotoxic T cells (also known as killer T cells) and helper T cells.
Immune cells that fight infections. Two broad categories are alpha-beta and gamma-delta T cells. Alpha-beta subsets include helper T cells (CD4+) and killer T cells (CD8+).
cells of the immune system responsible for B-cell stimulation and cell mediated immunity. There are 3 main subtypes of T cell, cytotoxic, helper and suppressor.
A kind of white blood cell. T cells mature in the thymus and derive their name from that organ. They are subdivided into T4 cells and T8 cells.
Also called 'T lymphocytes.' The type of lymphocyte which is responsible for cell-mediated immunity. T cells may directly kill a cell or produce chemicals called lymphokines that activate macrophages which will kill the cell. Compare with 'B cell.'
A type of white blood cell (lymphocyte) that is part of the body's immune system.
T stands for the thymus, where T lymphocytes mature. T cells are white blood cells that playa critical role in immune response, but, unlike B lymphocytes, do not produce antibodies (immunoglobulins). There are two main subtypes: the CD4+ helper T cells and the CD8+ cytotoxic or suppressor T cells.
Lymphocytes that mediate cellular immunity. They include helper, killer, suppressor, and memory cells.
A white blood cell which orchestrates the immune system's response to infected or malignant cells. CD4+ cells, which HIV targets, are a particular type of T cell. Click here to return to list
A disease-fighting white blood cell, including CD4 and CD8 cells. HIV infects and kills CD4 cells, weakening the immune system. The number of CD4 cells in a blood sample indicates the health of the immune system.
Type of lymphocyte (white cell), derived from the thymus, that attacks infected cells, foreign tissue, and cancer cells.
Type of lymphocyte - T cells help B cells make antibodies as part of an immune system response.
A type of lymphocyte that is a crucial part of the immune system.
type of white blood cell that regulates the immune response; T lymphocyte
a white blood cell of the immune system that participates in a number of immune responses.
One type of white blood cell that attacks virus-infected cells, foreign cells, and cancer cells. They also produce a number of substances that regulate the immune response.
white blood cell critical to the immune response. Among these are CD4+ T cells and CD8+ T cells. The "T" stands for the thymus, where T lymphocytes mature. (See also lymphocyte.)
See T lymphocyte.
A lymphocyte which undergoes a developmental stage in the thymus.
A type of white blood cell know as a lymphocyte. These cells are important body's immune system which helps fight off infections and cancer.
A thymus-derived lymphocyte primarily involved in cellular-type immunity.
A type of lymphocyte (white blood cell). Helper T cells play a prominent roll in the allergic response (see Allergies).
Type of lymphocyte which is involved in cellular immunity
A type of white blood cell known as a lymphocyte that expresses an antigen binding complex (T cell receptor – CD3 ) on the cell-surface. T cells bind processed antigen (antigenic peptides) presented by special cell surface (Major Histocompatibility Complex) molecules on antigen presenting cells or target cells.
T cell (or T lymphocyte) is a type of lymphocyte that matures in the thymus (hence "T") and is especially important in cell-mediated immunity. There are three types of T cells â€“ cytotoxic T cells (CD8+), helper T cells (CD4+), and regulatory T cells (CD4+CD25+). [ edit][ edit][ edit
T cells belong to a group of white blood cells known as lymphocytes and play a central role in cell-mediated immunity. They can be distinguished from other lymphocyte types, such as B cells and NK cells by the presence of a special receptor on their cell surface that is called the T cell receptor (TCR). The abbreviation "T", in T cell, stands for thymus since it is the principal organ for their development.