The urinary excretion of two proteins, B-2-microglobulin (beta 2M) and N-acetyl-B-D-glucosaminidase (NAG) was measured in 25 patients with rheumatoid arthritis (RA) on nonsteroidal anti-inflammatory drugs (NSAID). Although beta 2M excretion was normal NAG excretion was raised. As NAG excretion by a group of osteoarthritis patients receiving similar doses of NSAIDs was normal, it is concluded that rheumatoid disease per se may be associated with mild renal tubular dysfunction. Twelve of the above 25 patients were then given oral triethylphosphine-gold (auranofin) 6 mg daily and urinary beta 2M and NAG were measured after 6 months' treatment. Urinary excretion of beta 2M and NAG was also measured in 13 patients with RA established on intramuscular sodium aurothiomalate (MGST) and NSAIDs. Neither auranofin nor myocrisin were found to further significantly increase beta 2M and NAG excretion. These results suggest that gold compounds are not toxic to renal tubular epithelium.
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