Abstract
Background
In addition to recognized antimalarial effects, Artemisia annua L. (Qinghao) possesses anticancer properties. The underlying mechanisms of this activity are unknown. The aim of our experiments was to investigate the effects of distinct types of compounds isolated from A. annua on the immune-activated production of major mediators of angiogenesis playing a crucial role in growth of tumors and formation of metastasis.
Methods
Included in the study were the sesquiterpene lactones artemisinin and its biogenetic precursors arteannuin B and artemisinic acid. The semi-synthetic analogue dihydroartemisinin was used for comparative purposes. The flavonoids were represented by casticin and chrysosplenol D, the coumarin type of compounds by 4-methylesculetin. Their effects on the lipopolysaccharide (LPS)-induced in vitro production of nitric oxide (NO) were analyzed in rat peritoneal cells using Griess reagent. The LPS-activated production of prostaglandin E2 (PGE2) and cytokines (VEGF, IL-1β, IL-6 and TNF-α) was determined in both rat peritoneal cells and human peripheral blood mononuclear cells using ELISA.
Results
All sesquiterpenes (artemisinin, dihydroartemisinin, artemisinic acid, arteannuin B) significantly reduced production of PGE2. Arteannuin B also inhibited production of NO and secretion of cytokines. All NO, PGE2 and cytokines were suppressed by flavonoids casticin and chrysosplenol D. The coumarin derivative, 4-methylesculetin, was ineffective to change the production of any of these factors.
Conclusions
The inhibition of immune mediators of angiogenesis by sesquiterpene lactones and flavonoids may be one of the mechanisms of anticancer activity of Artemisia annua L.
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Abbreviations
- IL-:
-
interleukin-
- LPS:
-
lipopolysaccharide
- NO:
-
nitric oxide
- PBMC:
-
peripheral blood mononuclear cells
- PGE2:
-
prostaglandin E2
- TNF:
-
tumor necrosis factor
- VEGF:
-
vascular endothelial growth factor
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Zhu, X.X., Yang, L., Li, Y.J. et al. Effects of sesquiterpene, flavonoid and coumarin types of compounds from Artemisia annua L. on production of mediators of angiogenesis. Pharmacol. Rep 65, 410–420 (2013). https://doi.org/10.1016/S1734-1140(13)71016-8
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DOI: https://doi.org/10.1016/S1734-1140(13)71016-8