Crystal Structures and Cytotoxicity of ent-Kaurane-Type Diterpenoids from Two Aspilia Species
by
Souaibou Yaouba 1
, Arto Valkonen 2, Paolo Coghi 3, Jiaying Gao 3, Eric M. Guantai 4, Solomon Derese 1, Vincent K. W. Wong 3, Máté Erdélyi 5,6,7,* and Abiy Yenesew 1,*
Souaibou Yaouba 1, Arto Valkonen 2, Paolo Coghi 3, Jiaying Gao 3, Eric M. Guantai 4, Solomon Derese 1, Vincent K. W. Wong 3, Máté Erdélyi 5,6,7,* and Abiy Yenesew 1,*
1
Department of Chemistry, University of Nairobi, P. O. Box 30197, 00100 Nairobi, Kenya
2
Department of Chemistry, University of Jyvaskyla, P.O. Box 35, 40014 Jyvaskyla, Finland
3
State Key Laboratory of Quality Research in Chinese Medicine/Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macau 999078, China
4
Department of Pharmacology and Pharmacognosy, School of Pharmacy, University of Nairobi, P. O. Box 19676, 00202 Nairobi, Kenya
5
Department of Chemistry–BMC, Uppsala University, Husargatan 3, 75237 Uppsala, Sweden
6
The Swedish NMR Centre, Medicinaregatan 5, 40530 Gothenburg, Sweden
7
Department of Chemistry and Molecular Biology, University of Gothenburg, 40530 Gothenburg, Sweden
*
Authors to whom correspondence should be addressed.
Academic Editors: Isabel C.F.R. Ferreira and Nancy D. Turner
Molecules 2018, 23(12), 3199; https://doi.org/10.3390/molecules23123199
Received: 11 November 2018 / Revised: 26 November 2018 / Accepted: 30 November 2018 / Published: 4 December 2018
(This article belongs to the Collection Bioactive Compounds)
A phytochemical investigation of the roots of Aspilia pluriseta led to the isolation of ent-kaurane-type diterpenoids and additional phytochemicals (1–23). The structures of the isolated compounds were elucidated based on Nuclear Magnetic Resonance (NMR) spectroscopic and mass spectrometric analyses. The absolute configurations of seven of the ent-kaurane-type diterpenoids (3–6, 6b, 7 and 8) were determined by single crystal X-ray diffraction studies. Eleven of the compounds were also isolated from the roots and the aerial parts of Aspilia mossambicensis. The literature NMR assignments for compounds 1 and 5 were revised. In a cytotoxicity assay, 12α-methoxy-ent-kaur-9(11),16-dien-19-oic acid (1) (IC50 = 27.3 ± 1.9 µM) and 9β-hydroxy-15α-angeloyloxy-ent-kaur-16-en-19-oic acid (3) (IC50 = 24.7 ± 2.8 µM) were the most cytotoxic against the hepatocellular carcinoma (Hep-G2) cell line, while 15α-angeloyloxy-16β,17-epoxy-ent-kauran-19-oic acid (5) (IC50 = 30.7 ± 1.7 µM) was the most cytotoxic against adenocarcinomic human alveolar basal epithelial (A549) cells.
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Keywords:
Asteraceae; Aspilia pluriseta; Aspilia mossambicensis; ent-kaurane diterpenoid; X-ray crystal structure; cytotoxicity
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MDPI and ACS Style
Yaouba, S.; Valkonen, A.; Coghi, P.; Gao, J.; Guantai, E.M.; Derese, S.; Wong, V.K.W.; Erdélyi, M.; Yenesew, A. Crystal Structures and Cytotoxicity of ent-Kaurane-Type Diterpenoids from Two Aspilia Species. Molecules 2018, 23, 3199.
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