[The effect of certain substances on changes in the expression of class II HLA antigens]

With the aid of the RIA method, the authors found that the stimulation of T-lymphocytes by means of PWM lectin is linked to the expressivity of HLA antigens of class II on their surface. A simultaneous addition of indomethacin, tetracycline, coreton, hydrocortisone and novozir was decreasing the expressivity of the Ia antigens and, at the same time inhibited the lymphocyte proliferation. The growth factor for T (IL-2) lymphocytes was increasing the expressivity of HLA-DR antigens in the cells even without a previous stimulation by mitogen. Glucan, serous thymic factor, natrium salicylicum, hippuric acid had no effect on the expressivity of the HLA antigens of class II.