definition of killer t cell
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T lymphocyte Noun. 1. cytotoxic T cell-T cell with CD8 receptor that recognizes antigens on the surface of a virus-infected cell and binds to the infected cell and kill it. CD8 cell, CD8 T cell, killer cell, killer T cell. T cell, T lymphocyte-a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells.
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T cell A T cell or T lymphocyte is a type of lymphocyte (a subtype of white blood cell) that plays a central role in cell-mediated immunity. T cells can be distinguished from other lymphocytes, such as B cells and natural killer cells, by the presence of a T-cell receptor on the cell surface. They are called T cells because they mature in the thymus from thymocytes (although some also mature in the tonsils).
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- Dendritic cells are also proving to be major adjuvants in cancer vaccine research. Natural killer cells (NK cells) are a type of cytotoxic T-cell that are not specific for one cancer cell type, as are the tumor specific cells produced in response to dendritic cells.riginally NK cells were thought to simply attack cancer cells when they find them and not require activation by finding a specific cancer cell marker, hence the name natural killer cells. We now know that they are activated by lack of a cell marker that identifies the cell as “self” that is normal to the body.
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Lymph Nodes Lymphocytes. A lymphocyte is a type of white blood cell that is part of the immune system. There are two main types of lymphocytes: B cells and T cells. The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins.The T cells destroy the body's own cells that have themselves been taken over by viruses or become cancerous.here are two main types of lymphocytes: B cells and T cells. The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins. The T cells destroy the body's own cells that have themselves been taken over by viruses or become cancerous.
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Memory T cell Memory T cells are a subset of infection- as well as potentially cancer-fighting T cells (also known as a T lymphocyte) that have previously encountered and responded to their cognate antigen; thus, the term antigen-experienced T cell is often applied. Such T cells can recognize foreign invaders, such as bacteria or viruses, as well as cancer cells. Memory T cells have become experienced by having encountered antigen during a prior infection, encounter with cancer, or previous vaccination.
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- The regulatory T cells (Tregs pronunciation: /ˈtiːrɛɡ/), formerly known as suppressor T cells, are a subpopulation of T cells which modulate the immune system, maintain tolerance to self-antigens, and prevent autoimmune disease.
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Medical Definition of T cell Not all of their functions are known. T cells can produce substances called cytokines such as the interleukins which further stimulate the immune response. T-cell activation is measured as a way to assess the health of patients with HIV/AIDS and less frequently in other disorders.
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Killer T-Cells Killer T-Cells. The promise of using genetic engineering to treat cancer. Once a week, it seems, there is news of a breakthrough in cancer treatment. But the announcement 10 days ago that scientists have succeeded in using gene therapy to treat malignant melanoma merits special interest.
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Helper T Cells What are Th cells? T-helper cells (Th cells) are a subset of αβT-cells that usually express the CD4 co-receptor and have a major role in controlling and regulating the immune system by providing ‘help’ to other white blood cells.
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What is Immunity? - Definition & Types Since T-cells require direct contact with other cells, T-cell immunity is termed cell-mediated immunity. Activated T-cells become helper cells (TH) and cytotoxic (killer) T-cells. They recognize and cause the destruction of infected cells.
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T-Cells When a Helper T-cell sends out a chemical message, its matched Killer T-cell is alerted that there is a virus present. After a Killer T-cell finds and destroys an infected cell, this Helper T-cell message tells it to copy itself, making an army of Killer T-cells. Since only T-cells that can fight the invading virus are copied, your body saves energy and is still very good at killing the virus.
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Cell-Mediated Immune Responses T cells or T lymphocytes are a type of lymphocyte (in turn, a type of white blood cell) that plays a central role in cell-mediated immunity. They can be distinguished from other lymphocytes, such as B cells and natural killer cells (NK cells), by the presence of a T-cell receptor (TCR) on the cell surface.
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Beginners Guide to T cells T-cells are a type of white blood cell that circulate around our bodies, scanning for cellular abnormalities and infections. T-cells are essential for human immunity. The devastating effects of a lower than normal number of just one type of T-cell are all too evident in HIV/AIDS. There are several different kinds of T-cell; broadly speaking they can be divided into two different types, killer T-cells and helper T-cells.
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Suppressor T cell Suppressor T cell. Definition. noun. A type of T cell that expresses CD8 transmembrane glycoprotein, and functions by inhibiting, suppressing, or helping to stop an immune response by releasing signals to other immune cells. Supplement. Examples of suppressor T cells are suppressor macrophages.
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Cloning an Army of T Cells for Immune Defense Millions of different T cells are present in the lymphatic tissue. Each is poised to rapidly reproduce if triggered by the right molecular signal. The signal is presented by a special cell called the antigen-presenting cell (APC). The APC carries a foreign antigen, a piece of protein from an invader.
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T helper cell The T helper cells (Th cells) are a type of T cell that play an important role in the immune system, particularly in the adaptive immune system. They help the activity of other immune cells by releasing T cell cytokines.These cells help suppress or regulate immune responses.They are essential in B cell antibody class switching, in the activation and growth of cytotoxic T cells, and in maximizing bactericidal activity of phagocytes such as macrophages.onsidering the diverse and important role helper T cells play in the immune system, it is not surprising that these cells often influence the immune response against disease. They also appear to make occasional mistakes, or generate responses that would be politely considered non-beneficial.
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- 11 Comments. 1  Update: After researching and researching, here is my conclusion: Everybody wants to play it safe by not contradicting the “official numbers” that Mac releases, which state that the user base of Mac should be around 30 million now.
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Definitions &Translations U.S. National Library of Medicine(0.00 / 0 votes)Rate this definition: Lymphoid Progenitor Cells. Stem cells from which B-LYMPHOCYTES; T-LYMPHOCYTES; NATURAL KILLER CELLS; and some DENDRITIC CELLS derive.
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Learn About the Thymus Gland T lymphocytes or T-cells are white blood cells that protect against foreign organisms (bacteria and viruses) that have managed to infect body cells. They also protect the body from itself by controlling cancerous cells. From infancy to adolescence, the thymus is relatively large in size.
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Leukocytes  (White Blood Cells) T-Lymphocytes (T-Cells). A type of white blood cell. T-lymphocytes are part of the immune system and develop from stem cells in the bone marrow. They help protect the body from infection and may help fight cancer. Also called T cell and thymocyte.acrophages. A type of white blood cell that surrounds and kills microorganisms, removes dead cells, and stimulates the action of other immune system cells. Monocytes. A type of immune cell that is made in the bone marrow and travels through the blood to tissues in the body where it becomes a macrophage.
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- Dendritic cell: A special type of cell that is a key regulator of the immune system, acting as a professional antigen-presenting cell (APC) capable of activating naive Naïve t cells and stimulating the growth and differentiation Of b. cells
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Medical Definition of T cell home / medterms medical dictionary a-z list / t cell definition Medical Definition of T cell T cell: A type of white blood cell that is of key importance to the immune system and is at the core of adaptive immunity, the system that tailors the body's immune response to specific pathogens. The T cells are like soldiers who search out and destroy the targeted invaders.
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Blood This T cell (blue), one of the immune system's principal means of defense, identifies the molecular signature of a dendritic cell (green) at a contact point called the immunological synapse. If the immunological synapse signals the presence of a foe, the T cell will attack.
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- Once activated, helper T cells start to divide and to produce proteins that activate B and T cells as well as other immune cells. The killer T cell is specialized in attacking cells of the body infected by viruses and sometimes also by bacteria.
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The Immune System - in More Detail Once activated, helper T cells start to divide and to produce proteins that activate B and T cells as well as other immune cells. The killer T cell is specialized in attacking cells of the body infected by viruses and sometimes also by bacteria. It can also attack cancer cells.
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The Immune System - in More Detail T cells come in two different types, helper cells and killer cells. They are named T cells after the thymus, an organ situated under the breastbone. T cells are produced in the bone marrow and later move to the thymus where they mature.