Chemical constituents from aerial parts of Caryopteris incana and cytoprotective effects in human HepG2 cells

Title
Chemical constituents from aerial parts of Caryopteris incana and cytoprotective effects in human HepG2 cells
Authors
박선미손민정육창수진창배이용섭김형자
Keywords
Caryopteris incana (Thunb.) Miq.; Verbenaceae; Phenylpropanoids; Iridoids; Cytoprotection; tert-Butylhydroperoxide (t-BHP); HepG2 cell
Issue Date
2014-05
Publisher
Phytochemistry
Citation
VOL 101, 83-90
Abstract
An ethyl acetate fraction of the aerial parts of Caryopteris incana (Verbenaceae) showed potent cytoprotective effects against damage to HepG2 cells induced by tert-butylhydroperoxide (t-BHP). To search for hepatoprotective components of C. incana, various chromatographic separations of the ethyl acetate soluble fraction of C. incana led to isolation of three phenylpropanoid glycosides, 6‴-O-feruloylincanoside D, 6‴-O-sinapoylincanoside D and caryopteroside, and two iridoid glycosides, incanides A and B, together with 17 known compounds. Structures of these compounds were determined by spectroscopic analyses. The absolute stereochemistry of the caryopteroside was established with the help of circular dichroism data and in comparison with literature data. All isolated substances were determined for their cytoprotective effects against t-BHP-induced toxicity in HepG2 cells. Among the tested compounds, 6′-O-caffeoylacteoside exhibited the most potent cytoprotective activity with an IC50 value of 0.8 ± 0.1 μM against t-BHP-induced toxicity. Structure–activity relationships of the assay results indicated an important role of the catechol moiety in phenylpropanoid, iridoid and flavonoid derivatives in eliciting cytoprotective effects.
URI
http://pubs.kist.re.kr/handle/201004/47548
ISSN
00319422
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