Immunologic safety of ibuprofen in rheumatoid arthritis: preliminary evidence.

Some evidence indicates that ibuprofen and other prostaglandin synthetase inhibitors may have the potential for cellular immune enhancement in addition to their anti-inflammatory activity. If this is true, treatment of rheumatoid arthritis, a disorder of presumed autoimmune pathogenesis, would present a dilemma. These agents are widely used in rheumatoid arthritis for their anti-inflammatory effects. If they are found to enhance cellular immune function, however, the disease might be stimulated over the long term, rather than suppressed. Preliminary evidence from four patients with rheumatoid arthritis show that oral ibuprofen had no significant immunologic effect during sequential "on" and "off" cycles, as assessed by the following measures: delayed hypersensitivity skin testing; lymphocyte transformation to mitogen (phytohemagglutinin) or specific antigen (Candida albicans); T-cell subsets, as determined by monoclonal antibody techniques; or production of the lymphokine, human immune interferon, in response to phytohemagglutinin or to staphylococcal enterotoxin A. Early evidence, therefore, suggests that oral ibuprofen therapy may be 'immunologically safe' in patients with rheumatoid arthritis, but investigations of large series of patients also assessing local immune reaction in diseased joints may be necessary for confirmation.