Isolation of chebulic acid from Terminalia chebula Retz. and its antioxidant effect in isolated rat hepatocytes.
A hepatoprotective compound was isolated from the ethanolic extract of the fruits of Terminalia chebula Retz. by consecutive solvent partitioning, followed by silica gel and Sephadex LH-20 column chromatographies. The purified compound was identified as a mixture of chebulic acid and its minor isomer, neochebulic acid, with a ratio of 2:1 by spectroscopic analysis including 1D and 2D NMR and MS spectroscopy. To our knowledge, this is the first report on the protection of rat hepatocytes against oxidative toxicity by chebulic acid obtained from T. chebula Retz. This compound exhibited in vitro a free radical-scavenging activity and ferric-reducing antioxidant activity. Also, the specific ESR spectrum for the (*)OOH radical signals consisting of three-line ESR spectra was within the field of 0.27 mT, whereas 2.5 and 0.25 mg/ml of chebulic acid significantly reduced the signal intensity of the ESR spectra to 0.06 mT and 0.11 mT, respectively. Using isolated rat hepatocyte experiment, we demonstrated that the treatment of hepatocytes with chebulic acid significantly reduced the tert-butyl hydroperoxide (t-BHP)-induced cell cytotoxicity, intracellular reactive oxygen species level, and the ratio of GSSH, oxidized form of glutathione (GSH) to the over total GSH (GSH + GSSG) (4.42%) as compared to that with t-BHP alone (8.33%).
Lee
Hyun-Sun
HS
Department of Food Science, College of Life sciences and Biotechnology, Korea University, 1,5-ga, Anam-dong, Sungbuk-ku, Seoul, 136-701, South Korea.
Jung
Sung-Hoon
SH
Yun
Bong-Sik
BS
Lee
Kwang-Won
KW
D000818:Animals; D000975:Antioxidants / Q000302:isolation & purification* / Q000494:pharmacology; D004578:Electron Spin Resonance Spectroscopy; D005978:Glutathione / Q000032:analysis; D019803:Glutathione Disulfide / Q000032:analysis; D022781:Hepatocytes / Q000187:drug effects* / Q000378:metabolism; D047348:Hydrolyzable Tannins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D029766:Terminalia / Q000737:chemistry*
D000975:Antioxidants; D047348:Hydrolyzable Tannins; C103481:chebulinic acid; D005978:Glutathione; D019803:Glutathione Disulfide