Effect of anthocyanin-rich extract from black rice (Oryza sativa L. indica) on hyperlipidemia and insulin resistance in fructose-fed rats

Plant Foods Hum Nutr. 2007 Mar;62(1):1-6. doi: 10.1007/s11130-006-0031-7. Epub 2006 Dec 23.

Abstract

This study was designed to evaluate the effect of an anthocyanin-rich extract from black rice on hyperlipidemia and insulin resistance in fructose-fed rats. Rats fed fructose diet for 4 weeks exhibited significantly higher plasma insulin levels and lower insulin sensitivity than the control rats fed AIN-93G diet. Dietary supplementation with the anthocyanin-rich extract (5 g/kg of high-fructose diet) prevented the development of fructose-induced insulin resistance. After fructose-induced insulin resistance had been established, 4-week treatment with the anthocyanin-rich extract (5 g/kg of high-fructose diet) or pioglitazone (270 mg/kg of high-fructose diet) ameliorated the glucose intolerance and hyperlipidemia, but the extract failed to reverse the fructose-induced hyperinsulinemia as pioglitazone did. In addition, rats supplemented by the extract exhibited lower oxidative stress than the fructose-fed controls, as indicated by the lower concentrations of plasma thiobarbituric acid reactive substances and blood oxidized glutathione. Overall, these results suggest that the anthocyanin-rich extract from black rice improves certain metabolic abnormalities associated with diets high in fructose.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anthocyanins / therapeutic use*
  • Area Under Curve
  • Blood Glucose / metabolism
  • Fructose / adverse effects
  • Glutathione / blood
  • Glutathione / metabolism
  • Hyperlipidemias / drug therapy*
  • Hypolipidemic Agents / therapeutic use*
  • Insulin / metabolism
  • Insulin Resistance*
  • Male
  • Oryza / chemistry*
  • Phytotherapy*
  • Plant Extracts / therapeutic use*
  • Random Allocation
  • Rats
  • Rats, Sprague-Dawley
  • Thiobarbituric Acid Reactive Substances / analysis
  • Thiobarbituric Acid Reactive Substances / metabolism
  • Treatment Outcome

Substances

  • Anthocyanins
  • Blood Glucose
  • Hypolipidemic Agents
  • Insulin
  • Plant Extracts
  • Thiobarbituric Acid Reactive Substances
  • Fructose
  • Glutathione