Research Article

Immunomodulatory Effects of Diterpene Quinone Derivatives from the Roots of Horminum pyrenaicum in Human PBMC

Figure 5

Inhibition of indoleamine 2,3-dioxygenase, as indicated by Kyn/Trp, in mitogen-stimulated PBMC by the identified compounds. PBMC treated with PHA alone were used as a control for each experiment (set as 100%). (A) (1) horminone (), (2) 7-O-acetylhorminone (), (3) agastaqiunone () and HP-r4, which is an equimolar mixture of the compounds (4) 15,16-dehydroinuroyleanol and (5) 15,16-dehydroagastol (the average molecular weight was used for calculations; ) and (B) (6) inuroyleanol (), (7) agastol () and (8) 3-deoxyagastaquinone (). The number of replicates is indicated in brackets behind each compound. It was not possible to repeat the experiments in all cases due to the low amount of substance yield.
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