Journal
JOURNAL OF NATURAL PRODUCTS
Volume 81, Issue 3, Pages 465-474Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.7b00578
Keywords
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Funding
- National Natural Science Foundation of China [81302660, 81673513]
- Provincial Universities of Jiangsu Province Natural Science Foundation [13KJB350006]
- NIH from the National Cancer Institute [CA177584]
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The strong hemolytic toxicity of pulsatilla saponin D (1, HD50 6.3 mu M) has hampered its clinical development as an injectable anticancer agent. To combat this challenge, 17 new derivatives of 1 with ring C, C-28, or C-3 modifications were synthesized and evaluated for cytotoxicity against several selected human tumor lines, as well as for hemolytic toxicity against rabbit erythrocytes. Structure-activity relationship (SAR) and structure-toxicity relationship (STR) correlations were also elucidated. Compared to the lead compound 1, the hemolytic activity of all 17 derivatives dropped dramatically. Notably, compound 14 exhibited significant cytotoxicity toward A549 human lung cancer cells (IC50 2.8 mu M) in a dose-dependent manner without hemolytic toxicity (HD50 > 500 mu M). Molecular studies indicated that 14 induced typical G(1) cell cycle arrest and apoptosis in A549 cells, and Western blot assays suggested that both intrinsic and extrinsic apoptosis pathways were activated by 14. Collectively, compound 14 may merit further development as a potential anti-lung cancer agent.
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