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Indole Alkaloids Inhibiting Neural Stem Cell from Uncaria rhynchophylla |
Xin Wei1,2, Li-Ping Jiang2,3, Ying Guo1,2, Afsar Khan4, Ya-Ping Liu1, Hao-Fei Yu1,2, Bei Wang1,2, Cai-Feng Ding1,2, Pei-Feng Zhu1,2, Ying-Ying Chen1, Yun-Li Zhao1, Yong-Bing Chen3, Yi-Fen Wang1, Xiao-Dong Luo1,5 |
1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China; 2. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 3. Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, People's Republic of China; 4. Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan; 5. Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, People's Republic of China |
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Abstract Uncaria rhynchophylla is commonly recognized as a traditional treatment for dizziness, cerebrovascular diseases, and nervous disorders in China. Previously, the neuro-protective activities of the alkaloids from U. rhynchophylla were intensively reported. In current work, three new indole alkaloids (1-3), identified as geissoschizic acid (1), geissoschizic acid N4-oxide (2), and 3β-sitsirikine N4-oxide (3), as well as 26 known analogues were isolated from U. rhynchophylla. However, in the neural stem cells (NSCs) proliferation assay for all isolated compounds, geissoschizic acid (1), geissoschizic acid N4-oxide (2), isocorynoxeine (6), isorhynchophylline (7), (4S)-akuammigine N-oxide (8), and (4S)-rhynchophylline N-oxide (10) showed unexpected inhibitory activities at 10μM. Unlike previous neuro-protective reports, as a warning or caution, our finding showcased a clue for possible NSCs toxicity and the neural lesions risk of U. rhynchophylla, while the structure-activity relationships of the isolated compounds were discussed also.
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Keywords
Uncaria rhynchophylla
Indole alkaloids
NSCs proliferation
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Fund:The authors are grateful to the National Natural Science Foundation of China (81225024, 31500292, 31770388) for financial support. |
Issue Date: 06 February 2018
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