The effect of immunosuppressive and anti-inflammatory drugs on the T and B lymphocyte populations, as well as cellular hypersensitivity in relation to GBM antigens (measured by MIF activity) in 60 patients with different types of glomerulopathy has been tested. The results were compared with a control group of 47 untreated patients and 32 healthy subjects. The treatment was carried out using the following drugs: azathioprine, cyclophosphamide, prednisone, ibuprofen and indomethacin. In a sample of 14 patients receiving ibuprofen and in 7 receiving arathioprine, indomethacin and prednisone, the T and B lymphocyte kinetics as well as MIF activity were repeatedly tested before and during the treatment of 150 days. In the patients under this treatment, a decreased percentage of lymphocytes with receptors for a complement as well as, in some cases. MIF suppression was observed. A comparison of healthy subjects and untreated patients with a group of 39 subjects tested for T and B lymphocytes as well as MIF activity after several months of the above treatment was made. It was found that supportive therapy with azathioprine and prednisone led to a normalization of B lymphocytes (EA and EAC rosettes) and to a small increase of T lymphocytes number. On the other hand, treatment with indomethacin and ibuprofen led to an increased B lymphocyte count (EA and EAC rosettes). Cyclophosphamide given with azathioprine caused a decrease in the proportion of T lymphocytes and an increase in the number of null cells. In addition, it was found that immunosuppressive drugs as well as anti-inflammatory drugs, even when administered in supportive doses caused in some cases, the suppression of cellular immunity as measured by MIF activity.