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1 Departments of Pathobiology and Nutritional Sciences, 2 Department of Biostatistics, and 3 Department of Medicine, University of Washington, Seattle, Washington 98195
The aim of this study was to
determine whether phenotypes associated with type 2 diabetes are
altered in dyslipidemic obese mice. C57BL/6 wild-type, low-density
lipoprotein (LDL) receptor-deficient (LDLR
/
), and
apolipoprotein E-deficient (apoE
/
) mice were fed a high-fat,
high-carbohydrate diet (diabetogenic diet), and the development of
obesity, diabetes, and hypertriglyceridemia was examined. Wild-type
mice became obese and developed hyperglycemia, but not
hypertriglyceridemia, in response to this diet. LDLR
/
mice fed the
diabetogenic diet became more obese than wild-type mice and developed
severe hypertriglyceridemia and hyperleptinemia. Surprisingly, glucose
levels were only modestly higher and insulin levels and
insulin-to-glucose ratios were not strikingly different from those of
wild-type mice. In contrast, diabetogenic diet-fed apoE
/
mice were
resistant to changes in glucose and lipid homeostasis despite becoming
obese. These data suggest that modifications in lipoprotein profiles
associated with loss of the LDL receptor or apoE function have profound
and unique consequences on susceptibility to diet-induced obesity and
type 2 diabetic phenotypes.
obesity; type 2 diabetes; triglycerides; leptin; lipoproteins
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