title: Role of class I and class II antigens in the allogenic stimulation: class I and class II recognition in allogenic stimulation; blocking of MLR by monoclonal antibodies and F(ab')2 fragments.
abstract: Purified monomorphic monoclonal antibodies against Class I and Class II antigens in the inhibition of in vitro allogenic response were assayed. As expected, anti-Class II antibodies are highly inhibitory when used in concentrations greater than 5 micrograms/ml in MLRI and 50 micrograms/ml in MLRII. Surprisingly, anti-Class I monoclonal antibodies are as effective as anti-Class II in inhibiting primary MLR although they have no effect in MLRII. These results were confirmed by using F(ab')2 fragments. The inhibitory effect of anti-Class I has been shown to occur at the stimulator cell level. It is proposed that the allogenic stimulation is elicited after Class I and Class II recognition although only Class II differences are responsible for the proliferative response.
mesh_terms: D000911:Antibodies, Monoclonal / Q000145:classification / Q000502:physiology*; D000920:Antibody-Dependent Cell Cytotoxicity; D001667:Binding, Competitive; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000145:classification* / Q000276:immunology; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000276:immunology*; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D001613:beta 2-Microglobulin / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007140:Immunoglobulin Fab Fragments; D001613:beta 2-Microglobulin