ORIGINAL ARTICLES
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Structurally Diverse Sesquiterpenoids with Anti-neuroinflammatory Activity from the Endolichenic Fungus Cryptomarasmius aucubae
Yi-Jie Zhai, Jian-Nan Li, Yu-Qi Gao, Lin-Lin Gao, Da-Cheng Wang, Wen-Bo Han, Jin-Ming Gao
Shaanxi Key Laboratory of Natural Products and Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
Abstract Two new sterpurane sesquiterpenoids named sterpurol D (1 ) and sterpurol E (2 ), and one skeletally new sesquiterpene, cryptomaraone (3 ), bearing a 5,6-fused bicyclic ring system, along with five known ones, sterpurol A (4 ), sterpurol B (5 ), paneolilludinic Acid (6 ), murolane-2α , 9β -diol-3-ene (7 ) and (-)-10,11-dihydroxyfarnesol (8 ) were isolated from an endolichenic fungus Cryptomarasmius aucubae . The structures of the new compounds were elucidated by analysis of NMR spectroscopic spectra and HRESIMS data. The absolute configurations of 1 and 2 were established by spectroscopic data analysis and comparison of specific optical rotation, as well as the biosynthetic consideration. Additionally, compounds 1 , 2 , 4 -6 , and 8 showed significant nitric oxide (NO) production inhibition in Lipopolysaccharide (LPS)-induced BV-2 microglial cells with the IC 50 values ranging from 9.06 to 14.81 μ M.
Keywords
Endolichenic fungus
Cryptomarasmius aucubae
Sesquiterpenes
Anti-neuroinflammatory activity
Fund: This work was financed by the National Natural Science Foundation of China (Grant Nos. 21702169, 22077102).
Corresponding Authors:
Wen-Bo Han, Jin-Ming Gao
E-mail: wbhan@nwafu.edu.cn;jinminggao@nwsuaf.edu.cn
Issue Date: 04 June 2021
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