Use of proton spectroscopy for detection of homozygous fatty ZDF-drt rats before weaning

D. T. Stein, E. E. Babcock, C. R. Malloy, J. D. McGarry

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

OBJECTIVE: To investigate the use of proton spectroscopy to measure abdominal fat content in pre-obese offspring of obese and lean Zucker diabetic fatty (ZDF-drt) rats. DESIGN: Large and small litters (size 4-15, 127 pups total) were serially measured during the suckling period to assess their abdominal fat index (AFI) and subsequently identified as to their genotype (fa/fa obese or Fa/? lean). MEASUREMENTS: Body weight, abdominal fat index (derived from percent fat by proton spectroscopy x body weight). When the abdominal fat index was plotted vs body weight, the data fell along two regression lines that distinguished pre-obese from lean pups. Percent fat by proton spectroscopy was validated against chemical measurement. RESULTS: Genotypes of pre-obese and lean pups were distinguishable from 13 days of age onwards. The procedure allowed prediction of genotype with 98% accuracy at 12-15 days and was 100% reliable at 16 days and beyond. The rate of fat accretion in the pups correlated directly with genotype, litter size and caloric density of the mother's food. CONCLUSION: Unlike currently available methods, the technique is rapid, simple, non-invasive and has the additional advantage of providing a measure of fat content sequentially over time in the same animal. It should be useful for the study of early metabolic derangements in the development of obesity and non-insulin dependent diabetes syndromes.

Original languageEnglish (US)
Pages (from-to)804-810
Number of pages7
JournalInternational Journal of Obesity
Volume19
Issue number11
StatePublished - Jan 1 1995

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Keywords

  • Animal model
  • Body composition
  • Magnetic resonance imaging
  • Non-insulin dependent diabetes
  • Proton spectroscopy
  • Zucker diabetic fatty rat

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

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