Poster Presentation 23rd International Society of Magnetic Resonance Conference 2023

Application of low sample volume of proton NMR spectra for plasma lipoprotein subclass and metabolite analysis to evaluate the effect of the high-fat diet in Apo-E -/- mice (#248)

Mei-Ling Cheng 1 , YU-HSUAN HO 1 , Chi-Jen Lo 1
  1. Chang Gung University, Taoyuan City, Taiwan

The 1H NMR spectra of low-volume plasma samples could be acquired by NMR spectrometer and using 3 mm NMR sample tubes. This strategy is essential for the limited availability of samples, such as plasma samples from mice or children. Thus, we investigated the effects of a high-fat diet on Apo-E-/- mice via the utility of low sample volume in proton nuclear magnetic resonance (-H NMR) experiments. The 1H1 NMR spectra, including 1D solvent-presaturation, and CPMG spin−echo, were acquired and applied for 33 metabolites and 112 lipoproteins subclass analysis. In lipoprotein subclass analysis, we acquired data that includes cholesterol, free-form cholesterol, triacylglycerol, and phospholipid in individual lipoprotein subfractions (VLDL, IDL, LDL, and HDL) of plasma samples. The total triacylglycerol and cholesterol values in Apo-E-/- mice were higher than in wild-type mice. However, there is only cholesterol and phospholipid enhanced in high-fat diet-treated mice. Furthermore, the lipoprotein profiles revealed that the high-fat diet enhanced cholesterol, free-form cholesterol, and phospholipids accumulation in LDL subclass lipoprotein of Apo-E-/- mice but in HDL of wild-type mice. The Apo-B in the LDL subfraction  (LDL-1, LDL-2, and LDL-3), and Apo-A in the HDL subfraction of HDL-4 were enhanced in high-fat diet-treated Apo-E-/- mice. The 3 mm NMR tube and lipoprotein subclass analysis were suitable for volume-limited samples of lipoprotein subclass quantitation and low molecular weight metabolites profiling, which could be applied in mice disease model research.