The effects of several monoclonal antibodies (MAbs) directed against different epitopes of HLA class I and class II antigens on interferon (IFN)-gamma and IFN-alpha production were studied. The results indicate that: these MAbs have a marked inhibitory effect on the production of IFN-gamma induced by alloantigens and microbial antigens; they influence only to a lesser extent staphylococcal enterotoxin B (SEB)- and phytohemagglutinin (PHA)-induced IFN-gamma production; such effects parallel inhibition of lymphoproliferation except for PHA-induced blastogenesis, which is not affected; on the other hand, these MAbs have no effect on the production of IFN-alpha induced by lipopolysaccharide (LPS) or viruses.
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