Journal
PHYTOCHEMISTRY
Volume 159, Issue -, Pages 65-74Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2018.12.011
Keywords
Hypericum elatoides R. Keller; Hypericaceae; Polycyclic polyprenylated acylphloroglucinol; Flavanone-resveratrol adduct; Phenylpropanoid-substituted flavan-3-ol; Xanthone glycoside; Neuroprotective activity; Anti-neuroinflammatory activity
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Funding
- National Natural Science Foundation of China [31800291]
- Natural Science Basic Research plan in Shaanxi Province [2018JQ3032]
- Fundamental Research Funds for the Central Universities [2452017173]
- Scientific Startup Foundation for Doctors of Northwest AF University [2452015356]
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A phytochemical study on the aerial parts of Hypericum elatoides led to the isolation of a previously undescribed polycyclic polyprenylated acylphloroglucinol derivative, hyperelatone A, seven previously undescribed phenolic metabolites, hyperelatones B-H, along with ten known analogues. The structures of hyperelatones A-H were elucidated by 1D and 2D NMR spectroscopy, HRESIMS experiment, single-crystal X-ray diffraction and comparison of experimental and calculated ECD spectra, as well as chemical derivatization. All compounds were evaluated for their neuroprotective activity against hydrogen peroxide (H2O2)-induced cell injury in rat pheochromocytoma PC-12 cells and inhibitory effects on lipopolysaccharide (LPS)-induced nitric oxide (NO) production in BV-2 microglial cells. Hyperelatones B-D and H, cinchonain Ib, and tenuiside A showed noticeable neuroprotection at concentrations of 1.0-100.0 mu M. Hyperelatones D, G, and H, (-)-epicatechin, tenuiside A, and (Z)-3-hexenyl-beta-D-glucopyranoside exhibited significant anti-neuroinflammatory activity with IC50 values ranging from 0.75 +/- 0.02 to 5.83 +/- 0.23 mu M.
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