| 释义 |
T cell
T celln. Any of a class of lymphocytes, including the helper T cells and cytotoxic T lymphocytes, that form in bone marrow and mature in the thymus. T cells are activated when receptors on the cell surface recognize specific antigens. Also called T lymphocyte.
[t(hymus-derived) cell.]T cell
n. any of several closely related lymphocytes, developed in the thymus, that circulate in the blood and lymph and regulate the immune system's response to infected or malignant cells. Also called T lymphocyte. [1965–70; T(hymus-derived)] T cell Any of the lymphocytes that act to defend the body against disease by binding foreign antigens to receptors on the surface of their cells. T cells also regulate the function of B cells.Thesaurus| Noun | 1.T cell - a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cellsT lymphocytelymph cell, lymphocyte - an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infectionCD4 cell, CD4 T cell, helper cell, helper T cell - T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells; helper T cells are infected and killed by the AIDS virusCD8 cell, CD8 T cell, cytotoxic T cell, killer cell, killer 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 |
T cell
T cell[′tē ‚sel] (immunology) One of a heterogeneous population of thymus-derived lymphocytes which participates in the immune responses. Also known as T lymphocyte. T cell
T lym·pho·cytea lymphocyte formed in the bone marrow from which it migrates to the thymic cortex to become an immunologically competent cell; T lymphocytes have long lifespans (months to years) and are responsible for cell-mediated immunity; T lymphocytes form rosettes with sheep erythrocytes and differentiate and divide in the presence of transforming agents (mitogens); T lymphocytes have characteristic T cell receptor-CD3 complexes as surface markers and may be further categorized by function, such as helper and cytotoxic.
See also: B lymphocyte. Synonym(s): T cellT celln. Any of the lymphocytes that mature in the thymus and have the ability to recognize specific peptide antigens through the receptors on their cell surface. Also called T lymphocyte.T cell Cardiology
A specialised myocyte found in clusters in the sinus node, which is intermediate in size, structure, and organisation between P cells and normal atrial myocytes, and connect swith either of these cells; perinodal T cells surround the sinus tract and are thought to “bundle” impulses leaving the sinus node and to filter premature ectopic atrial impulses.
Immunology
A thymus-derived white cell responsible for cell-mediated immunity and immunoregulation which is the most complex cell of the immune system, given:
(1) The diversity of T-cell types, including T cells with activator, cytotoxic, delayed hypersensitivity and suppressor activities;
(2) The wide range of cytokines, growth factors and immune modulators produced by activated T cells;
(3) The complexity of T-cell interaction with exogenous and endogenous antigens (e.g., mediation of delayed hypersensitivity, graft-versus-host disease);
(4) The complexity of T-cell maturation in the thymus.
50 to 70% of circulating WBCs are granulocytes (neutrophils); the rest are lymphocytes, of which T cells (defined as having “pan T cell” markers), CD2 and CD7 and other T-cell markers (e.g., CD1, CD3, and CD5) comprise 70 to 85%; B cells comprise 15 to 30%.T lym·pho·cyte (lim'fŏ-sīt) A thymocyte-derived lymphocyte of immunologic importance that is responsible for cell-mediated immunity. These cells have the characteristic T3 surface marker and may be further divided into subsets according to function, such as helper, suppressor, and cytotoxic.
See also: B lymphocyte
Synonym(s): T cell. T cell One of the two broad categories of LYMPHOCYTE, the other being the B cell group. Subsets of T cells with different functions include cytotoxic T cells (CD8+ T cells) which destroy tumour cells and cells infected with viruses; helper T cells (CD4+ T cells) which assist the immune response, and are a target of HIV infection; REGULATORY T CELLS, formerly called suppressor T cells, which are essential for the maintenance of immunological tolerance; and natural Killer T cells (NKT cells).T cellA type of white blood cell produced in the thymus gland that regulates the immune system's response to diseased or malignant cells. It is possible that a subcategory of T cells known as CD4 cells plays a role in Ménière's disease.Mentioned in: Kawasaki Syndrome, Ménière's DiseaseT lym·pho·cyte (lim'fŏ-sīt) Lymphocyte formed in bone marrow from which it migrates to thymic cortex to become an immunologically competent cell. Patient discussion about T cellQ. How are cancer cells similar to normal cells, and how are they different? I know that a similarity would be cells regenerate, and a difference would be cancer cells grow uncontrollably.Is there anything else?A. I learned a lot of new things from the answers. Thanks. Q. what is difference between normal cell and a cell infected with cancer? A. Malignant cells (cancerous cells, which is the correct term, since cancer isn't transmitted from cell to cell like microbes), are immortalized cells: the life span of each cell in our body is tightly regulated according to the body's needs, so cells don't multiply endlessly and eventually undergo programmed death (called apoptosis). Cancerous cells succeed to overcome this regulation, and therefore become immortalized: either excessive multiplication or avoidance of death.
You may read more here:
http://www.mayoclinic.com/health/cancer/CA99999
Q. What tests can the doctors do to see if I have cancer cells still in me? Am using my friend user name. I had a mastectomy in October of the 3cms lump. They also removed lymph nodes from armpit. They found that 2 nodes were slightly infected and 2 blood vessels leading away were the same. My oncologist says I should start chemo for 5 months followed by 5 wks of radiotherapy. I am awaiting the results from bone, heart, lungs and blood tests. What tests can the doctors do to see if I have cancer cells still in me?A. You need to have your own self examination, which you can get guidance from doctor and all the tests which you already had and the tests which you are awaiting. Like you may have clinical examination, mammograms- which you already had, breast biopsy, ultrasonography, post biopsy pathology test, HER-2 gene test to find the speed of your tumor growth. Tests to check cancer spread – like lymph, bone, liver and lungs whose results you are waiting for. More discussions about T cellLegalSeeCellFinancialSeecellT cell
Related to T cell: killer T cell, T helper cell, T cell lymphoma, T cell receptorSynonyms for T cellnoun a small lymphocyte developed in the thymusSynonymsRelated Words- lymph cell
- lymphocyte
- CD4 cell
- CD4 T cell
- helper cell
- helper T cell
- CD8 cell
- CD8 T cell
- cytotoxic T cell
- killer cell
- killer T cell
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