Korean Journal of Medicinal Crop Science (한국약용작물학회지)

The Korean Society of Medicinal Crop Science (한국약용작물학회)
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Inhibitory Effect of the Phenolic Compounds from Geranium thunbergii on Rat Lens Aldose Reductase and Galactitol Formation

현초에서 분리된 페놀성 화합물들의 흰쥐 수정체 유래 알도즈 환원효소 및 갈락티톨 생성 억제 효과

  • 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)
  • 최세진 (한림대학교 식품영양학과) ;
  • 김진규 (한림대학교 천연의약연구소) ;
  • 장재만 (한림대학교 천연의약연구소) ;
  • 임순성 (한림대학교 식품영양학과)
  • Received : 2012.05.08
  • Accepted : 2012.07.23
  • Published : 2012.08.30
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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.

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References

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