| antibodies, anti-idiotypic | Antibodies which react with the individual structural determinants (idiotopes) on the variable region of other antibodies. (12 Dec 1998) |
|---|---|
| antibodies, antineutrophil cytoplasmic | Autoantibodies directed against cytoplasmic constituents of polymorphonuclear leukocytes and/or monocytes. They are used as specific markers for wegener's granulomatosis and other diseases, though their pathophysiological role is not clear. Anca are routinely detected by indirect immunofluorescence with three different patterns: c-anca (cytoplasmic), p-anca (perinuclear), and atypical anca. (12 Dec 1998) |
| antibodies, antinuclear | See: Antinuclear antibodies. (12 Dec 1998) |
| antibodies, antiphospholipid | Autoantibodies directed against phospholipids. These antibodies are characteristically found in patients with systemic lupus erythematosus (lupus erythematosus, systemic), antiphospholipid syndrome, related autoimmune diseases, some non-autoimmune diseases, and also in healthy individuals. (12 Dec 1998) |
| antibodies, archaeal | Immunoglobulins induced by substances elaborated by archaea that have an antigenic activity. (12 Dec 1998) |
| antibodies, bacterial | Immunoglobulins induced by substances elaborated by bacteria that have an antigenic activity. (12 Dec 1998) |
| antibodies, bispecific | Antibodies, often monoclonal, in which the two antigen-binding sites are specific for separate antigenic determinants. They are artificial antibodies produced by chemical crosslinking, fusion of hybridoma cells, or by molecular genetic techniques. They function as the main mediators of targeted cellular cytotoxicity and have been shown to be efficient in the targeting of drugs, toxins, radiolabelled haptens, and effector cells to diseased tissue, primarily tumours. (12 Dec 1998) |
| antibodies, blocking | Antibodies that inhibit the reaction between antigen and other antibodies or sensitised T-lymphocytes (e.g., antibodies of the IgG class that compete with IgE antibodies for antigen, thereby blocking an allergic response). Blocking antibodies that bind tumours and prevent destruction of tumour cells by cytotoxic T-lymphocytes have also been called enhancing antibodies. (12 Dec 1998) |
| antibodies, catalytic | Antibodies that can catalyze a wide variety of chemical reactions. They are characterised by high substrate specificity and share many mechanistic features with enzymes. (12 Dec 1998) |
| antibodies, fungal | Immunoglobulins induced by substances elaborated by fungi that have an antigenic activity. (12 Dec 1998) |
| antibodies, helminth | Antibodies produced by human or animal cells following clinical or experimental exposure to parasitic helminth antigens. The IgE class of immunoglobulins is usually formed and released, but IgG, IgM, and IgA may also occur. (12 Dec 1998) |
| antibodies, heterophile | Antibodies elicited in a different species from which the antigen originated. These antibodies are directed against a wide variety of interspecies-specific antigens, the best known of which are forssman, hanganutziu-deicher (h-d), and paul-bunnell (p-b). Incidence of antibodies to these antigens--i.e., the phenomenon of heterophile antibody response--is useful in the serodiagnosis, pathogenesis, and prognosis of infection and latent infectious states as well as in cancer classification. (12 Dec 1998) |
| antibodies, monoclonal | Antibodies produced by clones of cells such as those isolated after hybridization of activated b lymphocytes with neoplastic cells. These hybrids are often referred to as hybridomas. (12 Dec 1998) |
| antibodies, neoplasm | Immunoglobulins induced by antigens specific for tumours other than the normally occurring histocompatibility antigens. (12 Dec 1998) |
| antibodies, protozoan | Antibodies produced by human or animal cells following clinical or experimental exposure to parasitic protozoan antigens. (12 Dec 1998) |