['Traditional Chinese medicine herbs (TCMHs) are used in medicines as well as in daily dietary supplements in Asia. In this study, we employed pNF-kappaB-Luc or pIFN-gamma-Luc and BALB/c mice peritoneal macrophages or splenocytes to investigate both the immune and inflammatory effects of six selected plant species.', 'Specifically, we used ethyl acetate fractions of Astragalus membranaceus (Fisch.) Bunge var. mongholicus (Bunge) Hsiao (Fabaceae) (AM), Andrographis paniculata (Burm. f.) Nees (Acanthaceae) (AP), Angelica sinensis (Oliv.) Diels (Apiaceae) (AS), Eucommia ulmodes Oliv. (Eucommiaceae) leaves (EU leaves), Isatis indigotica Fort. (Brassicaceae) (II) and Morus alba L. (Moraceae) (MA).', 'We found that ethyl acetate fractions of AP, AS and MA significantly decreased NF-kappaB luciferase activity and also the secretion of NO and PGE(2) in LPS/IFN-gamma stimulated mouse peritoneal macrophages (p<0.05). In contrast, they did not affect IFN-gamma luciferase activity or IFN-gamma production in concanavalin A (Con A)-activated mouse splenocytes. Our results indicated that the anti-inflammatory properties of these plant extracts might be resulted from the inhibition of pro-inflammatory mediators (e.g., NO and PGE(2)), at least in part via suppression of a signaling pathway such as NF-kappaB.'] Is the production of nitric oxide and prostaglandin E2 in peritoneal macrophages inhibited by Andrographis paniculata , Angelica sinensis and Morus alba ethyl acetate fractions?