Abstract
Sera and synovial fluids from patients with a variety of rheumatic diseases were assayed for interleukin-2 (IL-2) activity in a system utilizing the proliferative response of cultured human phytohaemagglutinin (PHA) T cell blasts. The synovial fluids from 14 rheumatoid arthritis, eight ankylosing spondylitis, three psoriatic arthritis and 11 osteoarthritis patients, all showed IL-2 activity. The amounts of IL-2 present in the fluids from different diseases were compared and ranged from 4.2 to 140.0 units/ml.
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