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The aim of this study was to compare the potency of intestinal lipid absorption in Zucker obese rats compared with Sprague-Dawley (SD) rats. Six male Zucker obese (fa/fa) and six male SD rats baring intestinal lymph fistulae were used in this study. After 24 h recovery, rats were infused inraduodenally with a lipid emulsion containing 40 micromol triolein (labeled with glycerol tri[(3)H-oleate]), 7.8 micromol phosphatidyl choline in 3 ml phosphate buffered saline at a rate of 3 ml/h for 8 h. Lymph samples were collected and the radioactive lipid content determined. Apolipoprotein B (apo B) level in the lymph was evaluated. The Zucker obese rats transported more radioactive lipid into the lymph compared with the SD rats, particularly in the early phase of lipid absorption. Lymph apo B levels in the intestinal mucosa were significantly increased compared with the SD rats. In conclusion, this study indicated that lipid absorption and transport in Zucker obese rats is concomitant with increased apo B levels in the mesenteric lymph, indicating that the increase in lipid absorption may be responsible, at least in part, for obesity progression and hyperlipidemia.

Increased Lipid Absorption and Transport in the Small Intestine of Zucker Obese Rats