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Attenuation of Brain Injury by Water Extract of Goat's-beard (Aruncus dioicus) and Its Ethyl Acetate Fraction in a Rat Model of Ischemia-Reperfusion

  • Han, Hyung-Soo (Department of Physiology, Kyungpook National University School of Medicine) ;
  • Lee, Jong-Won (Department of Biochemistry, School of Medicine, Catholic University of Daegu)
  • 투고 : 2011.06.10
  • 심사 : 2011.07.26
  • 발행 : 2011.09.30

초록

Ischemic stroke constitutes about 80% of all stroke incidences. It is characterized by brain cell death in a region where cerebral arteries supplying blood are occluded. Under these ischemic conditions, apoptosis is responsible for the cell death, at least in part. Goat's-beard (Aruncus dioicus var. kamtschaticus) is a perennial plant that grows naturally in the alpine regions of Korea. In the present study, we first determined whether water extract of goat's-beard (HY1646) and some of its fractions prepared by partitioning with organic solvents could improve the viability of human hepatocellular carcinoma cells (HepG2) cultured under hypoxic condition by blocking apoptotic pathways. Based on the in vitro findings, we subsequently investigated whether HY1646 and the ethyl acetate fraction (EA) selected from cell culture-based screening could attenuate brain injury in a rat middle cerebral artery occlusion (MCAO) model of ischemia (2 hr), followed by 22 hours of reperfusion. The cell number was sustained close to that initially plated in the presence of HY1646 even after 24 hr of cell culture under hypoxic condition (3% $O_2$), at which time the cell number reached almost zero in the absence of HY1646. This improvement in cell viability was attributed to the delay in apoptosis, identified by the formation of DNA ladder in gel electrophoresis. Of fractions soluble in hexane, ethyl acetate (EA) and butanol, EA was chosen for the animal experiments because EA demonstrated the best cell viability at the lowest concentration (10 ${\mu}g$/mL). HY1646 (200 mg/kg) and EA (10 and 20 mg/kg) significantly reduced infarct size, an index of brain injury, by 16.6, 40.0 and 61.0%, respectively, as assessed by 2,3,5-triphenyl tetrazolium chloride staining. The findings suggest that prophylactic intake of goat's beard might be beneficial for preventing ischemic stroke.

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피인용 문헌

  1. DNA Damage Protection and Anti-inflammatory Activity of Different Solvent Fractions from Aruncus dioicus var. kamtschaticus vol.27, pp.6, 2014, https://doi.org/10.7732/kjpr.2014.27.6.714
  2. Plant-based foods containing cell wall polysaccharides rich in specific active monosaccharides protect against myocardial injury in rat myocardial infarction models vol.6, pp.1, 2016, https://doi.org/10.1038/srep38728
  3. Methanol Extract of Goat's-beard (Aruncus dioicus) Reduces Renal Injury by Inhibiting Apoptosis in a Rat Model of Ischemia-Reperfusion vol.17, pp.2, 2012, https://doi.org/10.3746/pnf.2012.17.2.101
  4. Identification of active compounds from Aurantii Immatri Pericarpium attenuating brain injury in a rat model of ischemia–reperfusion vol.138, pp.1, 2013, https://doi.org/10.1016/j.foodchem.2012.09.137