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Possible antiinflammatory effects of dehydroevodiamine (1) and evodiamine (2) were examined by assessing their effects on NO production in the murine macrophage-like cell line RAW 264.7. The results indicated that both 1 and 2 inhibited the IFN-gamma/LPS-stimulated NO production in a concentration-dependent manner. However, 1 appeared to inhibit NO production by interfering not only with the priming signal initiated by IFN-gamma but also with iNOS protein synthesis, while 2 affected the former only.
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Chiou et al. (1997) studied this question.
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