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Ma XL, Li J, Zheng J, Gu XP, Ferreira D, Zjawiony JK, Zhao MB, Guo XY, Tu PF, Jiang Y. LC-MS-Guided Isolation of Insulin-Secretion-Promoting Monoterpenoid Carbazole Alkaloids from Murraya microphylla. JOURNAL OF NATURAL PRODUCTS 2018; 81:2371-2380. [PMID: 30381950 DOI: 10.1021/acs.jnatprod.8b00338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fifteen new structurally unique monoterpenoid carbazole alkaloids, including two pairs of epimers (1/2 and 3/4), three pairs of enantiomers (6a/6b, 7a/7b, and 8a/8b), and five optically pure analogues (5, 9-12), were obtained from a 95% aqueous EtOH extract of Murraya microphylla by a combination of bioassay- and LC-MS-guided fractionation procedures. Their structures were established based on NMR and HRESIMS data interpretation. The absolute configuration of compound 1 was determined via X-ray crystallographic data analysis and for all compounds by comparison of experimental and calculated ECD data. Compounds 1-5 were assigned as five new thujane-carbazole alkaloids, and compounds 6-12 as 10 new menthene-carbazole alkaloids linked through an ether or carbon-carbon bond. Compounds 1-12 promoted insulin secretion in the HIT-T15 cell line, 1.9-3.1-fold higher than the gliclazide control at 100 μM.
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Affiliation(s)
- Xiao-Li Ma
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , People's Republic of China
| | - Jun Li
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica , Beijing University of Chinese Medicine , Beijing 100029 , People's Republic of China
| | - Jiao Zheng
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica , Beijing University of Chinese Medicine , Beijing 100029 , People's Republic of China
| | - Xiao-Pan Gu
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica , Beijing University of Chinese Medicine , Beijing 100029 , People's Republic of China
| | - Daneel Ferreira
- Department of BioMolecular Sciences, Division of Pharmacognosy, and Research Institute of Pharmaceutical Sciences, School of Pharmacy , University of Mississippi , University , Mississippi 38677-1848 , United States
| | - Jordan K Zjawiony
- Department of BioMolecular Sciences, Division of Pharmacognosy, and Research Institute of Pharmaceutical Sciences, School of Pharmacy , University of Mississippi , University , Mississippi 38677-1848 , United States
| | - Ming-Bo Zhao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , People's Republic of China
| | - Xiao-Yu Guo
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , People's Republic of China
| | - Peng-Fei Tu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , People's Republic of China
| | - Yong Jiang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , People's Republic of China
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