The protective role of amla (Emblica officinalis Gaertn.) against fructose-induced metabolic syndrome in a rat model

Br J Nutr. 2010 Feb;103(4):502-12. doi: 10.1017/S0007114509991978. Epub 2009 Nov 2.

Abstract

We investigated the effects of amla (Emblica officinalis Gaertn.) on fructose-induced metabolic syndrome using a rat model. Male Wistar rats were fed a high-fructose (65 %) diet or standard chow for 1 week, and treated with an ethyl acetate (EtOAc) extract of amla, a polyphenol-rich fraction, at 10 or 20 mg/kg body weight per d, or vehicle, for 2 weeks. Serum glucose, TAG, total cholesterol and blood pressure levels of the high-fructose diet-fed rats were increased compared with those of the normal rats (P < 0.001). However, the EtOAc extract of amla ameliorated the high fructose-induced metabolic syndrome, including hypertriacylglycerolaemia and hypercholesterolaemia. Also, the elevated levels of hepatic TAG and total cholesterol in rats given the high-fructose diet were significantly reduced by 33.8 and 24.6 %, respectively (P < 0.001), on the administration of the EtOAc extract of amla at the dose of 20 mg/kg with the regulation of sterol regulatory element-binding protein (SREBP)-1 expression. The protein levels of PPARalpha and SREBP-2 were not affected by the feeding of the high-fructose diet or EtOAc extract of amla. In addition, oral administration of the amla extract at the dose of 20 mg/kg significantly inhibited the increased serum and hepatic mitochondrial thiobarbituric acid-reactive substance levels (21.1 and 43.1 %, respectively; P < 0.001). Furthermore, the amla extract inhibited the increase of cyclo-oxygenase-2 with the regulation of NF-kappaB and bcl-2 proteins in the liver, while the elevated expression level of bax was significantly decreased by 8.5 and 10.2 % at the doses of 10 and 20 mg/kg body weight per d, respectively. These findings suggest that fructose-induced metabolic syndrome is attenuated by the polyphenol-rich fraction of amla.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Blood Glucose / metabolism
  • Blood Pressure / drug effects
  • Cholesterol / blood*
  • Cyclooxygenase 2 / blood
  • Dietary Sucrose / pharmacology
  • Disease Models, Animal
  • Fructose
  • Fruit
  • Hypercholesterolemia / drug therapy
  • Hyperlipidemias / drug therapy
  • Liver / metabolism*
  • Male
  • Metabolic Syndrome / chemically induced
  • Metabolic Syndrome / prevention & control*
  • Mitochondria / metabolism
  • NF-kappa B / antagonists & inhibitors
  • PPAR alpha / metabolism
  • Phyllanthus emblica*
  • Phytotherapy*
  • Plant Extracts / pharmacology
  • Plant Extracts / therapeutic use*
  • Rats
  • Rats, Wistar
  • Sterol Regulatory Element Binding Proteins / metabolism
  • Thiobarbituric Acid Reactive Substances / metabolism
  • Triglycerides / blood*
  • Triglycerides / metabolism
  • bcl-2-Associated X Protein / metabolism

Substances

  • Blood Glucose
  • Dietary Sucrose
  • NF-kappa B
  • PPAR alpha
  • Plant Extracts
  • Sterol Regulatory Element Binding Proteins
  • Thiobarbituric Acid Reactive Substances
  • Triglycerides
  • bcl-2-Associated X Protein
  • Fructose
  • Cholesterol
  • Cyclooxygenase 2