Journal
JOURNAL OF NATURAL PRODUCTS
Volume 79, Issue 8, Pages 1922-1928Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.6b00158
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan [18406002, 25293025, 26305005]
- Grants-in-Aid for Scientific Research [25293025, 26305005] Funding Source: KAKEN
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Seven new spongian diterpenes, ceylonamides A-F (1-6) and 15 alpha,16-dimethoxyspongi-13-en-19-oic acid (7), were isolated from the Indonesian marine sponge Spongia ceylonensis along with eight known spongian diterpenes, 8-15. Compounds 1-6 were determined to be nitrogenous spongian diterpenes. The isolated compounds were examined for the inhibition of RANKL-induced osteoclastogenesis in RAW264 macrophages. Ceylonamide A (1) exhibited the most potent inhibitory activity with an IC50 value of 13 mu M, followed by ceylonamide B (2) (IC50, 18 mu M). An examination of the structure activity relationships of the isolated compounds revealed that the position of the carbonyl group of the y-lactam ring and bulkiness of the substituent at its nitrogen atom were important for inhibitory activity.
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