Bioactive Natural Products from Soft Corals

A special issue of Marine Drugs (ISSN 1660-3397).

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 6476

Special Issue Editors


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Guest Editor
Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804201, Taiwan
Interests: synthesis of bioactive natural products; structure modification of natural products; chemistry of marine natural products
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804201, Taiwan
Interests: natural product chemistry; establishment and application of natural extract bank
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,                

Marine organisms are regarded as very important producers for bioactive natural products. Among these organisms, soft corals are the second most prolific source of marine natural products, next to sponges. Compared to stony corals, soft corals do not produce calcium carbonate skeletons. Although rare peptide-type and proteinaceous metabolites have been discovered, they biosynthesize abundant natural products with unique carbon skeletons, including fatty acids, steroids, and terpenoids as the main types of secondary metabolite produced. These metabolites can defend the host organisms against predators, fight diseases, and prevent the fouling and overgrowth of other organisms. The discoveries of lemnalol and clavulones in the 1980s and cembranolides before and up to the 1980s make soft corals the attractive targets for new drug development. In addition, metabolites from Pseudopterogorgia elisabethae and Briareum excavatum have been found to demonstrate attracting anti-inflammatory effects. Furthermore, the discovery of austrasulfone and its synthesized derivative dihydroaustrasulfone alcohol exhibit not only anti-inflammatory activity, but the latter compound could potentially exhibit therapeutic ability in the treatment of neuropathic pain, atherosclerosis, and multiple sclerosis. Therefore, natural products from soft corals have been considered to be medicinally important and could be beneficial to human health.

The goal of this Special Issue is to provide a platform for scientists of related fields to share and report the discovery and development of bioactive natural products from soft corals. We invite researchers of this field all over the world to publish original research and review articles in this Special Issue. Potential topics include but are not limited to:

  • Soft coral natural products as antifouling agents;
  • Soft coral natural products as anti-inflammatory agents;
  • Soft coral natural products as anticancer agents;
  • Soft coral natural products as antiviral agents;
  • Soft coral natural products for fighting diseases.

Prof. Dr. Jyh-Horng Sheu
Prof. Dr. Yuan-Bin Cheng
Guest Editors

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Keywords

  • Soft corals
  • Natural products and structure elucidation
  • Synthesis of bioactive derivatives and activities
  • Drug development

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Published Papers (2 papers)

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Research

11 pages, 2017 KiB  
Article
Targeted Isolation of Xenicane Diterpenoids From Taiwanese Soft Coral Asterospicularia laurae
by Yu-Chi Lin, Yi-Jen Chen, Shu-Rong Chen, Wan-Ju Lien, Hsueh-Wei Chang, Yu-Liang Yang, Chia-Ching Liaw, Jui-Hsin Su, Ching-Yeu Chen and Yuan-Bin Cheng
Mar. Drugs 2021, 19(3), 123; https://doi.org/10.3390/md19030123 - 25 Feb 2021
Cited by 4 | Viewed by 2350
Abstract
Application of LC-MS/MS-based molecular networking indicated the ethanol extract of octocoral Asterospicularia laurae is a potential source for the discovery of new xenicane derivatives. A natural product investigation of this soft coral resulted in the isolation of four new xenicane diterpenoids, asterolaurins O–R [...] Read more.
Application of LC-MS/MS-based molecular networking indicated the ethanol extract of octocoral Asterospicularia laurae is a potential source for the discovery of new xenicane derivatives. A natural product investigation of this soft coral resulted in the isolation of four new xenicane diterpenoids, asterolaurins O–R (14), together with six known compounds, xeniolide-A (5), isoxeniolide-A (6), xeniolide-B (7), 7,8-epoxyxeniolide-B (8), 7,8-oxido-isoxeniolide-A (9), and 9-hydroxyxeniolide-F (10). The structures of isolated compounds were characterized by employing spectroscopic analyses, including 2D-NMR (COSY, HMQC, HMBC, and NOESY) and high-resolution electrospray ionization mass spectrometry (HRESIMS). Asterolaurin O is the first case of brominated tricarbocyclic type floridicin in the family Xeniidae. Concerning bioactivity, the cytotoxic activity of those isolates was evaluated. As a result, compounds 1 and 2 demonstrated a selective cytotoxic effect against the MCF-7 cell line at IC50 of 14.7 and 25.1 μM, respectively. Full article
(This article belongs to the Special Issue Bioactive Natural Products from Soft Corals)
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11 pages, 1493 KiB  
Article
New Hydroquinone Monoterpenoid and Cembranoid-Related Metabolites from the Soft Coral Sarcophyton tenuispiculatum
by Tzu-Yin Huang, Chiung-Yao Huang, Shu-Rong Chen, Jing-Ru Weng, Tzu-Hsuan Tu, Yuan-Bin Cheng, Shih-Hsiung Wu and Jyh-Horng Sheu
Mar. Drugs 2021, 19(1), 8; https://doi.org/10.3390/md19010008 - 27 Dec 2020
Cited by 14 | Viewed by 3328
Abstract
Chemical investigation of the marine soft coral Sarcophyton tenuispiculatum resulted in the isolation of a 1,4-dihydrobenzoquinone, sarcotenuhydroquinone (1), three new cembranoids, sarcotenusenes A‒C (24), and ten previously reported metabolites 514. The chemical structures of [...] Read more.
Chemical investigation of the marine soft coral Sarcophyton tenuispiculatum resulted in the isolation of a 1,4-dihydrobenzoquinone, sarcotenuhydroquinone (1), three new cembranoids, sarcotenusenes A‒C (24), and ten previously reported metabolites 514. The chemical structures of all isolated metabolites were determined by detailed spectroscopic analyses. In biological assays, anti-inflammatory, cytotoxic, and peroxisome proliferator-activated receptor γ (PPAR-γ) transcription factor assays of all compounds were performed. None of the isolated compounds were found to exhibit activity in the PPAR-γ transcription factor assay. The anti-inflammatory assays showed that (+)-7α,8β-dihydroxydeepoxysarcophine (13) inhibited the production of IL-1β to 56 ± 1% at a concentration of 30 µM in lipopolysaccharide (LPS)-stimulated J774A.1 macrophage cells. In addition, 1 and 2 were found to exhibit cytotoxicity towards a panel of cancer cell lines. Full article
(This article belongs to the Special Issue Bioactive Natural Products from Soft Corals)
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