title: Delineation of an immunoregulatory amplifier population recognizing autologous Ia molecules. Analysis with human T cell clones.
abstract: Autoreactive T lymphocytes were generated by culturing human peripheral blood mononuclear cells with an antigen-specific major histocompatibility complex (MHC)-restricted autologous inducer T cell, termed RW17C and subsequently cloned in soft agar. The majority of such clones (AC1-13) expressed the T3+T4+T8-T11+Ia+ phenotype and were directed at autologous class II MHC gene products found on B cells, macrophages, and B lymphoblastoid cells as judged by their proliferative response to the latter. For this recognition, the clones employed a T3-Ti molecular complex and a T4 structure analogous to those found on allospecific T cells. Perhaps more importantly, it was observed that the same AC1-13 autoreactive clones (AC) induced autologous B cells to produce high levels of immunoglobulin in the absence of exogenous antigen and could synergize with the RW17C clone to effect maximal B cell Ig production. These results support the notion that such autoreactive cells can function in a physiologic amplifier role by facilitating induction via an internal set of signals (i.e. autologous MHC).
mesh_terms: D000485:Allergens; D000911:Antibodies, Monoclonal / Q000276:immunology; D000921:Antibody-Producing Cells / Q000276:immunology; D052179:Antigens, Plant; D001402:B-Lymphocytes / Q000276:immunology; D002999:Clone Cells / Q000276:immunology / Q000502:physiology; D000939:Epitopes; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D008213:Lymphocyte Activation; D010940:Plant Proteins; D011058:Pollen / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology* / Q000502:physiology
chemical_list: D000485:Allergens; C026967:Amb a I protein, Ambrosia artemisiifolia; D000911:Antibodies, Monoclonal; D052179:Antigens, Plant; D000939:Epitopes; D000949:Histocompatibility Antigens Class II; D010940:Plant Proteins; D011948:Receptors, Antigen, T-Cell