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| This glossary contains: 19186 medical terms |
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MHC restriction
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MHC restriction The ability of T lymphocytes to respond only when they 'see' the appropriate antigen in association with "self" MHC class I or class II proteins on the antigen presenting cells.
RELATED TERMS--------------------------------------
Antigen
A substance which, when present in animal tissue, stimulates the production of antibodies
Association
1. In dysmorphology (the study of birth defects), the nonrandom occurrence in two or more individuals of a pattern of multiple anomalies (birth defects) not known to be a malformation syndrome (such as Down syndrome), a malformation sequence (of events) or what is called a polytopic field defect (in which all of the defects are concentrated in one particular area of the body). An example of an association in dysmorphology is the VACTERL association of birth defects. 2. In genetics, the occurrence together of two or more characteristics more often than would be expected by chance alone. An example of association involves a feature on the surface of white blood cells called HLA (HLA stands for human leukocyte antigen). A particular HLA type, HLA type B-27, is associated with an increased risk for a number of diseases including ankylosing spondylitis. The extent of the association is enormous. Ankylosing spondylitis is 87 times more likely to occur in people with HLA B-27 than in the general population.
SIMILAR TERMS--------------------------------------
MHC class I molecule
A molecule encoded to genes of the MHC which participates in antigen presentation to cytotoxic T (CD8+) cells.
MHC class II molecule
A molecule encoded by genes of the MHC which participates in antigen presentation to helper T (CD4+) cells.
PREVIOUS AND NEXT TERMS--------------------------------------
Major histocompatibility complex (MHC)
A cluster of genes on chromosome 6 in humans, encoding cell surface molecules that are polymorphic and that code for antigens which lead to rapid graft rejection between members of a single species which differ at these loci. Several classes of protein such as MHC class I and II proteins are encoded in this region. These in humans, are known as 'Human leukocyte antigens' (HLA).
Mast cell
Tissue located cell probably derived from basophils. Possesses receptor for Fc of IgE. Participates in 'Immediate hypersensitivity' reactions.
Memory
In the immune system, memory denotes an active state of immunity to a specific antigen, such that a second encounter with that antigen leads to a larger and more rapid response.
MHC class I molecule
A molecule encoded to genes of the MHC which participates in antigen presentation to cytotoxic T (CD8+) cells.
MHC class II molecule
A molecule encoded by genes of the MHC which participates in antigen presentation to helper T (CD4+) cells.
MHC restriction
Migration inhibition factor (MIF)
A lymphokine that inhibits the motility of macrophages in culture.
Minor histocompatibility antigens
These antigens, encoded outside the MHC, are numerous, but do not generate rapid graft rejection or primary responses of T cells in vitro. They do not serve as restricting elements in cell interactions.
Mitogen
A substance that stimulates the proliferation of many different clones of lymphocytes.
Mixed lymphocyte reaction (MLR)
When lymphocytes from two individuals are cultured together, a proliferative response is generally observed, as the result of reactions of T cells of one individual to MHC antigens on the other individual's cells.
Monoclonal
Literally, coming from a single clone. A clone is the progeny of a single cell. In immunology, monoclonal generally describes a preparation of antibody that is monogenous, or cells of a single specificity.
RELATED TERMS--------------------------------------
Antigen
A substance which, when present in animal tissue, stimulates the production of antibodies
Association
1. In dysmorphology (the study of birth defects), the nonrandom occurrence in two or more individuals of a pattern of multiple anomalies (birth defects) not known to be a malformation syndrome (such as Down syndrome), a malformation sequence (of events) or what is called a polytopic field defect (in which all of the defects are concentrated in one particular area of the body). An example of an association in dysmorphology is the VACTERL association of birth defects. 2. In genetics, the occurrence together of two or more characteristics more often than would be expected by chance alone. An example of association involves a feature on the surface of white blood cells called HLA (HLA stands for human leukocyte antigen). A particular HLA type, HLA type B-27, is associated with an increased risk for a number of diseases including ankylosing spondylitis. The extent of the association is enormous. Ankylosing spondylitis is 87 times more likely to occur in people with HLA B-27 than in the general population.
SIMILAR TERMS--------------------------------------
MHC class I molecule
A molecule encoded to genes of the MHC which participates in antigen presentation to cytotoxic T (CD8+) cells.
MHC class II molecule
A molecule encoded by genes of the MHC which participates in antigen presentation to helper T (CD4+) cells.
PREVIOUS AND NEXT TERMS--------------------------------------
Major histocompatibility complex (MHC)
A cluster of genes on chromosome 6 in humans, encoding cell surface molecules that are polymorphic and that code for antigens which lead to rapid graft rejection between members of a single species which differ at these loci. Several classes of protein such as MHC class I and II proteins are encoded in this region. These in humans, are known as 'Human leukocyte antigens' (HLA).
Mast cell
Tissue located cell probably derived from basophils. Possesses receptor for Fc of IgE. Participates in 'Immediate hypersensitivity' reactions.
Memory
In the immune system, memory denotes an active state of immunity to a specific antigen, such that a second encounter with that antigen leads to a larger and more rapid response.
MHC class I molecule
A molecule encoded to genes of the MHC which participates in antigen presentation to cytotoxic T (CD8+) cells.
MHC class II molecule
A molecule encoded by genes of the MHC which participates in antigen presentation to helper T (CD4+) cells.
MHC restriction
Migration inhibition factor (MIF)
A lymphokine that inhibits the motility of macrophages in culture.
Minor histocompatibility antigens
These antigens, encoded outside the MHC, are numerous, but do not generate rapid graft rejection or primary responses of T cells in vitro. They do not serve as restricting elements in cell interactions.
Mitogen
A substance that stimulates the proliferation of many different clones of lymphocytes.
Mixed lymphocyte reaction (MLR)
When lymphocytes from two individuals are cultured together, a proliferative response is generally observed, as the result of reactions of T cells of one individual to MHC antigens on the other individual's cells.
Monoclonal
Literally, coming from a single clone. A clone is the progeny of a single cell. In immunology, monoclonal generally describes a preparation of antibody that is monogenous, or cells of a single specificity.
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This dictionary contains 19186 terms.
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