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Liang XX, Zhang XJ, Zhao YX, Feng J, Zeng JC, Shi QQ, Kaunda JS, Li XL, Wang WG, Xiao WL. Aspulvins A-H, Aspulvinone Analogues with SARS-CoV-2 M pro Inhibitory and Anti-inflammatory Activities from an Endophytic Cladosporium sp. J Nat Prod 2022; 85:878-887. [PMID: 35293744 PMCID: PMC8938825 DOI: 10.1021/acs.jnatprod.1c01003] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Indexed: 05/06/2023]
Abstract
Eight new aspulvinone analogues, aspulvins A-H (1-8) and aspulvinones D, M, O, and R (9-12), were isolated from cultures of the endophytic fungus Cladosporium sp. 7951. Detailed spectroscopic analyses were conducted to determine the structures of the new compounds. All isolates displayed different degrees of inhibitory activity against the severe acute respiratory syndrome coronavirus 2 main protease (SARS-CoV-2 Mpro) at 10 μM. Notably, compounds 9, 10, and 12 showed potential SARS-CoV-2 Mpro inhibition with IC50 values of 10.3 ± 0.6, 9.4 ± 0.6, and 7.7 ± 0.6 μM, respectively. For all compounds except 3 and 4, the anti-inflammatory activity occurred by inhibiting the release of lactate dehydrogenase (LDH) with IC50 values ranging from 0.7 to 7.4 μM. Compound 10 showed the most potent anti-inflammatory activity by inhibiting Casp-1 cleavage, IL-1β maturation, NLRP3 inflammasome activation, and pyroptosis. The findings reveal that the aspulvinone analogues 9, 10, and 12 could be promising candidates for coronavirus disease 2019 (COVID-19) treatment as they inhibit SARS-CoV-2 infection and reduce inflammatory reactions caused by SARS-CoV-2.
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Affiliation(s)
- Xin-Xin Liang
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
| | - Xing-Jie Zhang
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
| | - Ying-Xin Zhao
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
| | - Jian Feng
- Key Laboratory of Chemistry in Ethnic Medicinal
Resources, State Ethnic Affairs Commission and Ministry of Education and Key Laboratory of
Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs
Commission, Yunnan Minzu University, Kunming 650031,
People’s Republic of China
| | - Jie-Chun Zeng
- Key Laboratory of Chemistry in Ethnic Medicinal
Resources, State Ethnic Affairs Commission and Ministry of Education and Key Laboratory of
Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs
Commission, Yunnan Minzu University, Kunming 650031,
People’s Republic of China
| | - Qiang-Qiang Shi
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
| | - Joseph Sakah Kaunda
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
| | - Xiao-Li Li
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
| | - Wei-Guang Wang
- Key Laboratory of Chemistry in Ethnic Medicinal
Resources, State Ethnic Affairs Commission and Ministry of Education and Key Laboratory of
Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs
Commission, Yunnan Minzu University, Kunming 650031,
People’s Republic of China
| | - Wei-Lie Xiao
- Key Laboratory of Medicinal Chemistry for Natural
Resource, Ministry of Education; Yunnan Provincial Center for Research & Development
of Natural Products; School of Chemical Science and Technology, Yunnan
University, Kunming 650091, People’s Republic of
China
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