Table 1.

IC₅₀ values (in μM) for substances tested in LPS-activated RAW264.7 cells

	PGE2		Nitric Oxide
	Mean ± S.E.M.	N	Mean ± S.E.M.	N
Z-ligustilide	9.3 ± 1.6	33	12.8 ± 1.4	58
15d–PGJ2	2.2 ± 0.5	16	2.3 ± 0.6	25
Rosiglitazone	>50	2	26.9 ± 1.9	16
L-NAME	>500	2	150 ± 12	2

Cells (in triplicates) were incubated with graded amounts of substances, stimulated with 1 μg/mL LPS and cultured for 24 h. PGE₂ and NO were measured by EIA and the Griess reaction, respectively, and the IC₅₀ values were calculated for each experimental series. N: number of independent experimental series. L-NAME: L-N^G-Nitroarginine methyl ester