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http://dx.doi.org/10.7783/KJMCS.2012.20.4.222

Inhibitory Effect of the Phenolic Compounds from Geranium thunbergii on Rat Lens Aldose Reductase and Galactitol Formation  

Choi, Se-Jin (Department of Food Science and Nutrition, Hallym University)
Kim, Jin-Kyu (Institute of Natural Medicine, Hallym University)
Jang, Jai-Man (Institute of Natural Medicine, Hallym University)
Lim, Soon-Sung (Department of Food Science and Nutrition, Hallym University)
Publication Information
Korean Journal of Medicinal Crop Science / v.20, no.4, 2012 , pp. 222-230 More about this Journal
Abstract
We evaluated the inhibitory effects of extracts and components of Geranium thunbergii on aldose reductase (AR) and galactitol formation in rat lenses with high levels of galactose as a part of our ongoing search of natural sources for therapeutic and preventive agents for diabetic complications. The inhibitory effects of water, methanol and ethanol extracts of G. thunbergii on rat lens AR (RLAR) were determined. Comparing inhibitory effects of various solvent extracts, ethanol extract showed RLAR inhibitory activity ($IC_{50}$ values, 5.24 and $6.39{\mu}g/m{\ell}$, respectively). The ethanol extract was fractionated to chloroform, ethyl acetate and water. Of these, the ethyl acetate fraction from ethanol extract of G. thunbergii exhibited RLAR inhibitory activity ($IC_{50}$ value, $2.64{\mu}g/m{\ell}$). In order to identify the bioactive components of ethyl acetate soluble fraction of ethanol extract from G. thunbergii, eight compounds, namely gallic acid (1), protocatechuic acid (2), p-hydroxybenzoic acid (3), brevifolin carboxylic acid (4), geraniin (5), ellagic acid (6), kaempferol-3-O-arabinofuranosyl-7-O-rhamnopyranoside (7), kaempferitrin (8) were isolated. The isolates were subjected to in vitro bioassays to evaluate their inhibitory activity on RLAR and galactitol formation in rat lenses. The ellagic tannins (5, 6) and flavonoid (7) exhibited strong inhibitory effects on RLAR. Also, these three compounds (5, 6 and 7) suppressed galactitol accumulation in rat lens under high galactose conditions, demonstrating the potential to prevent galactitol accumulation exo vivo. These results suggest that the extracts and components of G. thunbergii are a promising agent in the prevention or treatment of diabetic complications.
Keywords
Geranium thunbergii; Aldose Reductase; Galactitol Accumulation; Ellagic Acid; Geraniin;
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