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Journal Article
Research Support, Non-U.S. Gov't
Chemical constituents from the rare mushroom Calvatia nipponica inhibit the promotion of angiogenesis in HUVECs.
Bioorganic & Medicinal Chemistry Letters 2017 September 2
Calvatia species, also known as puffball mushrooms, are common sources of food worldwide. Calvatia nipponica (Agaricaceae) is one of the most rare species in the Calvatia genus. It was first validated in 2008. Due to its scarcity, C. nipponica has never been chemically investigated. Its recent discovery in Korea allowed to conduct this study, and using bioactivity-guided fractionation for antiangiogenic activity, chemical investigation of the MeOH extract of the fruiting bodies of C. nipponica led to the isolation of five alkaloids (1-5) and two phenolic compounds (6-7). This is the first study to report the chemical investigation of C. nipponica, and compound 1 was previously reported as chemically synthesized only until our report of its isolation and identification from natural sources. The structure of 1 was determined by spectroscopic analysis by 1D and 2D NMR spectra and HR-MS. All compounds (1-7) were tested for inhibition of angiogenesis using human umbilical vein endothelial cells (HUVECs). Compounds 2, 4 and 5 significantly inhibited the promotion of angiogenesis in HUVECs. Compound 5 showed the most potent inhibition via downregulation of VEGF, p38 and ERK signaling pathways. These results suggested that the rare mushroom C. nipponica might be beneficial in antiangiogenesis therapy for cancer treatment.
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