MRI and NMR spectroscopy of the lipids of atherosclerotic plaque in rabbits and humans

Theodore "Ted" Trouard, Maria I Altbach, Glenn C. Hunter, Cleamond D. Eskelson, Arthur F Gmitro

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The early stages of atherosclerosis are characterized by the deposition of cholesteryl esters and triglycerides into the arterial wall. In the excised human atherosclerotic plaque these lipids are in a liquid-like state at body temperature and observable via MRI and NMR spectroscopy. To assess the ability of MRI to quantitatively image the lipids of atherosclerotic plaque in vivo, we have investigated eight New Zealand White rabbits fed atherogenic diets (2 weight (wt)% cholesterol, 1 wt% cholesterol + 6 wt% peanut oil, and 1 wt% cholesterol + 6 wt% corn oil). Postmortem examination indicated that all rabbits developed atherosclerosis in the aorta. Except for one animal, magnetic resonance angiography showed no noticeable obstruction in the aorta. MRI was carried out in an attempt to image atherosclerotic plaque lipids directly, but no signal was detected in vivo. However, a plaque lipid signal was observed from excised tissue using a small diameter RF coil. 1H NMR spectroscopy of the atherosclerotic plaque from excised aortas indicated that the major fraction of plaque lipids in rabbits is not in a liquid state at physiological temperature and are only marginally MRI- visible compared to human plaque lipid. The differences in the MRI characteristics of rabbit and human plaque are due to differences in the fatty acid profile of the cholesteryl esters, chiefly a decrease of linoleic acid in rabbit lesions.

Original languageEnglish (US)
Pages (from-to)19-26
Number of pages8
JournalMagnetic Resonance in Medicine
Volume38
Issue number1
DOIs
StatePublished - Jul 1997

Fingerprint

Atherosclerotic Plaques
Magnetic Resonance Spectroscopy
Rabbits
Lipids
Weights and Measures
Aorta
Cholesterol Esters
Cholesterol
Atherosclerosis
Atherogenic Diet
Corn Oil
Magnetic Resonance Angiography
Linoleic Acid
Body Temperature
Autopsy
Triglycerides
Fatty Acids
Temperature

Keywords

  • Atherosclerosis
  • Lipids
  • MRI
  • NMR
  • Rabbits

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

MRI and NMR spectroscopy of the lipids of atherosclerotic plaque in rabbits and humans. / Trouard, Theodore "Ted"; Altbach, Maria I; Hunter, Glenn C.; Eskelson, Cleamond D.; Gmitro, Arthur F.

In: Magnetic Resonance in Medicine, Vol. 38, No. 1, 07.1997, p. 19-26.

Research output: Contribution to journalArticle

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