Metabolic profiling of liver from hypercholesterolemic pigs fed rye or wheat fiber and from normal pigs. High-resolution magic angle spinning 1H NMR spectroscopic study

Anal Chem. 2007 Jan 1;79(1):168-75. doi: 10.1021/ac061322+.

Abstract

This study presents the first application of a high-resolution magic angle spinning 1H NMR approach to elucidate the metabolic effects of a hypercholesterolemic condition and two high-fiber diets based on rye and wheat bread, respectively, in intact pig liver biopsy samples. Standard 1D and spin-echo 1H spectra were acquired on a total of 20 biopsy samples, and 2D total correlation spectroscopy experiments were carried out on selected samples for assignment of the observed resonances. Principal component analyses and partial least-squares regression discriminant analysis revealed differences in the hepatic lipid content and choline-containing compounds between normal and hypercholesterolemic pigs. In addition, the results demonstrated that the liver metabolite profile of hypercholesterolemic pigs fed a high-fiber rye bread differed from that of pigs fed high-fiber wheat bread with respect to both the lipoprotein fractions and the choline-containing compounds. These findings suggest that earlier reports on high-fiber rye diet-induced effects on plasma HDL/LDL content partially can be ascribed to effects on liver cholesterol metabolism and that the hepatic phospholipase pathways of phosphatidylcholine breakdown are affected by the high-fiber rye diet.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animal Feed*
  • Animals
  • Cholesterol / metabolism
  • Choline / metabolism
  • Dietary Fiber / administration & dosage
  • Dietary Fiber / pharmacology*
  • Hypercholesterolemia / drug therapy*
  • Least-Squares Analysis
  • Lipid Metabolism / drug effects*
  • Liver / chemistry
  • Liver / drug effects*
  • Liver / metabolism
  • Magnetic Resonance Spectroscopy / methods
  • Magnetic Resonance Spectroscopy / standards
  • Phosphatidylcholines / metabolism
  • Phospholipases / metabolism
  • Principal Component Analysis
  • Secale
  • Swine
  • Triticum

Substances

  • Dietary Fiber
  • Phosphatidylcholines
  • Cholesterol
  • Phospholipases
  • Choline