Congratulations Mexico! With more than 38 components identified in Propolis, you've discovered 2 more...
Institute of Natural Medicine, Univ. of Toyama , Japan, College of Medical Science, China Three Gorges Univ. , China;
Two New Cytotoxic Phenylallylflavanones from Mexican Propolis
Summary:
Two new phenylallylflavanones, (2R,3R)-6-[1-(4 -hydroxy-3 -methoxyphenyl)prop-2-en-1-yl]pinobanksin (1) and (2R,3R)-6-[1-(4 -hydroxy-3 -methoxyphenyl)prop-2-en-1-yl]pinobanksin 3-acetate (2) were isolated from a methanolic extract of Mexican propolis. Their structures were elucidated with spectroscopic analysis. Both compounds (1, 2) exhibited preferential cytotoxic activity against PANC-1 human pancreatic cancer cells in a nutrient-deprived medium with the concentration at which 50% cells died preferentially in NDM (PC50) values of 17.9 M and 9.1 M, respectively.
Propolis is the resinous substance collected by bees from various plants, and used for hive construction and repairs as well as for defense purposes. 1) Humans have used propolis as a natural remedy for thousands of years because of its numerous health benefits. 1) Propolis has been reported to have anticancer, 2,3) antiviral, 4) antifungal, 4,5) antibacterial, 4,6) antioxidant, 7) immunomodulatory, 8) and anti-inflammatory activity. 9) Today, propolis is widely used in food, beverage, and pharmaceutical industries as a health supplement. 10) As acontinuation of our previous research on propolis from different geographic locations, 11—19) we previously reported two new flavonoids, 8-[1-(4[1]-hydroxy-3[1]-methoxyphenyl)prop- 2-en-1-yl]galangin (3) and 8-[1-(4[1]-hydroxy-3[1]-methoxyphenyl)prop-2-en-1-yl]chrysin (4), possessing a unique structural feature with a phenylallyl moiety attached to their flavone skeleton, from a methanol (MeOH) extract of Mexican propolis. 19) Interestingly, they showed strong preferential cytotoxic activity against PANC-1 human pancreatic cancer cells (PANC-1) in a nutrient-deprived medium (NDM). Further work on the extract resulted in the isolation of two new phenylallylflavanones (1, 2), shown in Chart 1...
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