[Decrease of mitogen stimulation of lymphocytes in rheumatoid arthritis].
Peripheral blood lymphocytes of 51 patients with rheumatoid arthritis and of 14 healthy blood donors were cultivated in autologous and homologous normal pool-serum and stimulated with phytohemagglutinin (PHA-P), concanavalin A (Con A) and pokeweed mitogen (PMW) in different doses. In autologous as well as in homologous pool-serum the 3H-thymidine uptake of stimulated lymphocytes from patients with rheumatoid arthritis was significantly depressed independent of the mitogen concentration used. Serum from patients with rheumatoid arthritis depressed the activation of blood donor lymphocytes by Con A and PWM. The depression of lymphocyte activation was not related to the presence of rheumatoid factors in the serum, the severity of the disease and the anti-rheumatic therapy.