Lipid metabolism in diet-induced obese rabbits is similar to that of obese humans

Xiao Jun Zhang, David L. Chinkes, Asle Aarsland, David N. Herndon, Robert R. Wolfe

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Whereas diet-induced obese rabbits have been used to study various aspects of obesity, alterations of lipid metabolism in this model have not been clarified. This study aimed to compare plasma nonesterified fatty acid (NEFA) and triglyceride (TG) kinetics in obese and lean rabbits by means of U- 13C16-palmitate infusion. Young female rabbits consumed either a high-fat diet (49% energy from fat) ad libitum to develop obesity (n = 6) or a normal diet (7.9% energy from fat) as lean control (n = 5). After 10 wk of feeding, the body weight of obese rabbits (5.33 ± 0.05 kg) was greater (P < 0.001) than that of lean rabbits (3.89 ± 0.07 kg). The obese rabbits had higher concentrations of plasma NEFA and TG and a greater rate of fatty acid (FA) turnover. Whereas the fractional secretion rates of hepatic TG did not differ, 100% of hepatic secretory TG was synthesized from plasma NEFA in the lean rabbits compared to 59% in the obese rabbits (P < 0.001). In the lean rabbits, hepatic lipase-mediated hydrolysis of lipoprotein TG did not contribute to the FA pool for synthesis of secretory TG, consistent with the naturally occurring deficit in hepatic lipase in this species. We conclude that lipid metabolism in diet-induced obese rabbits is similar to that in obese humans. The deficiency in hepatic lipase in rabbits simplifies the quantitation of hepatic lipid kinetics.

Original languageEnglish (US)
Pages (from-to)515-518
Number of pages4
JournalJournal of Nutrition
Volume138
Issue number3
DOIs
StatePublished - Mar 2008

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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