We have shown that during the developing phase of adjuvant disease (AD) in rats the expression of MHC class II (Ia) antigens on blood monocytes (BM) was enhanced. The results of a study in established AD are reported now. Four agents were tested: indomethacin and diclofenac-sodium (1 mg/kg/day); levamisole and prinomide (10 mg/kg/day), administered orally from day 18-31 after induction of AD. We assessed the following BM parameters: Ia expression, interleukin-1 (sIL-1) production, and membrane bound IL-1 (mIL-1). In AD Ia expression was enhanced, no changes occurred in mIL-1 or sIL-1. Indomethacin treatment reduced sIL-1 production, levamisole Ia expression and mIL-1 activity, prinomide all three parameters measured and diclofenac, though clinically effective, none.
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