Abstract
Sex hormones have an effect on various immune responses but the mechanisms of action are unknown. One of these mechanisms might be a modification of expression of major histocompatibility complex (MHC) antigens in blood leucocytes. Estradiol-induced variations of the expression of guinea pig blood leukocytes MHC antigens (GPL-A) was studied. Class I and class II MHC antigens were detected by a sensitive rosetting method using specific alloimmune sera (AIS) and staphylococcal protein A-coated sheep red blood cells (SPA-SRBC) and evaluated by counting the number of bound SPA-SRBC per 100 cells. MHC antigens decreased after estrogen treatment. Estradiol modifies the expression of GPL-A antigens on the mononuclear cells including the Kurloff cells, which are involved in immunity or in a natural killer effect, but did not affect the expression of polymorphonuclear cells, ones which are not involved in immunity.
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