Alpha tocopherol supplementation elevates plasma apolipoprotein A1 isoforms in normal healthy subjects

Sarah Aldred, Tommaso Sozzi, Ian Mudway, Melissa M. Grant, Hendrik Neubert, Frank J. Kelly, Helen R. Griffiths*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Plasma α-tocopherol (AT) concentrations are inversely related to cardiovascular (CV) risk; however, intervention studies with AT have failed to show any consistent benefit against CV disease (CVD). Proteomics offers the opportunity to examine novel effects of AT supplementation on protein expression and therefore improve our understanding of the physiological roles of AT. Thus, to investigate the effects of AT supplementation on the plasma proteome of healthy subjects we have undertaken a double-blind, randomised, parallel design supplementation study in which healthy subjects (n = 32; 11 male and 21 female) consumed AT supplements (134 or 268 mg/day) or placebo capsules for up to 28 days. Plasma samples were obtained before supplementation and after 14 and 28 days of supplementation for analysis of changes in the plasma proteome using 2-DE and MALDI-MS. Using semiquantitative proteomics, we observed that proapolipoprotein A1 (identified by MS and Western blotting) was altered at least two-fold. Using quantitative ELISA techniques, we confirmed a significant increase in plasma apolipoprotein A1 concentration following supplementation with AT which was both time and dose dependent (p < 0.01 after 28 days supplementation with 268 mg AT/day). These data demonstrate the time and dose sensitivity of the plasma proteome to AT supplementation. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.

Original languageEnglish
Pages (from-to)1695-1703
Number of pages9
JournalProteomics
Volume6
Issue number5
DOIs
Publication statusPublished - Mar 2006

Keywords

  • α-Tocopherol
  • 2-DE
  • apolipoprotein A1
  • human
  • plasma proteome

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    Aldred, S., Sozzi, T., Mudway, I., Grant, M. M., Neubert, H., Kelly, F. J., & Griffiths, H. R. (2006). Alpha tocopherol supplementation elevates plasma apolipoprotein A1 isoforms in normal healthy subjects. Proteomics, 6(5), 1695-1703. https://doi.org/10.1002/pmic.200500217