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Mar. Drugs 2018, 16(4), 127; https://doi.org/10.3390/md16040127

Terpenoids from the Soft Coral Sinularia sp. Collected in Yongxing Island

1
Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Yushan Road 5, Qingdao 266003, China
2
Laboratory of Marine Drugs and Biological Products, National Laboratory for Marine Science and Technology, Qingdao 266235, China
3
College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, Qingdao 266100, China
4
Nationaal Natuurhistorisch Museum, P.O. Box 9517, 2300 BA Leiden, The Netherlands
5
National Museum of Marine Biology and Aquarium, Pingtung 94450, Taiwan
6
Graduate Institute of Marine Biology, National Dong Hwa University, Pingtung 94450, Taiwan
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 20 March 2018 / Revised: 8 April 2018 / Accepted: 10 April 2018 / Published: 13 April 2018
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Abstract

Three new sesquiterpenoids (sinuketal (1), sinulins A and B (2 and 3)) and two new cembranoids (sinulins C and D (4 and 5)), as well as eight known sesquiterpenoids (6–13) and eight known cembranoids (14–21), were isolated from the Xisha soft coral Sinularia sp. Their structures were elucidated by extensive spectroscopic analysis. Compound 1 possesses an unprecedented isopropyl-branched bicyclo [6.3.0] undecane carbon skeleton with unique endoperoxide moiety, and a plausible biosynthetic pathway of it was postulated. According to the reported biological properties of endoperoxide, the antimalarial, cytotoxic, antiviral, and target inhibitory activities of 1 were tested. Compound 1 showed mild in vitro antimalarial activity against Plasmodium falciparum 3D7, weak cytotoxic activities toward Jurkat, MDA-MB-231, and U2OS cell lines, inhibitory effects against influenza A viruses H1N1 and PR8, as well as mild target inhibitory activity against acetylcholinesterase. The other compounds were evaluated for cytotoxicities against HeLa, HCT-116, and A549 tumor cell lines and target inhibitory activities against protein tyrosine phosphatase 1B (PTP1B). Compound 20 exhibited cytotoxicities against HeLa and HCT-116, and compounds 5, 11, and 15 showed mild target inhibitory activities against PTP1B. View Full-Text
Keywords: soft coral; Sinularia sp.; sesquiterpenoid; cembranoid; antimalarial; cytotoxicities; antiviral; targets inhibitory activities soft coral; Sinularia sp.; sesquiterpenoid; cembranoid; antimalarial; cytotoxicities; antiviral; targets inhibitory activities
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Qin, G.-F.; Tang, X.-L.; Sun, Y.-T.; Luo, X.-C.; Zhang, J.; van Ofwegen, L.; Sung, P.-J.; Li, P.-L.; Li, G.-Q. Terpenoids from the Soft Coral Sinularia sp. Collected in Yongxing Island. Mar. Drugs 2018, 16, 127.

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