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• W2153688154 abstract "The role of insulin resistance (IR) in atherogenesis is poorly understood, in part because of a lack of appropriate animal models. We assumed that fructose-fed LDL receptor-deficient (LDLR-/-) mice might be a model of IR and atherosclerosis because (1) fructose feeding induces hyperinsulinemia and IR in rats; (2) a preliminary experiment showed that fructose feeding markedly increases plasma cholesterol levels in LDLR-/- mice; and (3) hypercholesterolemic LDLR-/- mice develop extensive atherosclerosis. To test whether IR could be induced in LDLR-/- mice, 3 groups of male mice were fed a fructose-rich diet (60% of total calories; n=16), a fat-enriched (Western) diet intended to yield the same plasma cholesterol levels (n=18), or regular chow (n=7) for approximately 5.5 months. The average cholesterol levels of both hypercholesterolemic groups were similar (849+/-268 versus 964+/-234 mg/dL) and much higher than in the chow-fed group (249+/-21 mg/dL). Final body weights in the Western diet group were higher (39+/-6.2 g) than in the fructose- (27.8+/-2.7 g) or chow-fed (26.7+/-3.8 g) groups. Contrary to expectation, IR was induced in mice fed the Western diet, but not in fructose-fed mice. The Western diet group had higher average glucose levels (187+/-16 versus 159+/-12 mg/dL) and 4.5-fold higher plasma insulin levels. Surprisingly, the non-insulin-resistant, fructose-fed mice had significantly more atherosclerosis than the insulin-resistant mice fed Western diet (11.8+/-2.9% versus 7.8+/-2. 5% of aortic surface; P<0.01). These results suggest that (1) fructose-enriched diets do not induce IR in LDLR-/- mice; (2) the Western diets commonly used in LDLR-/- mice may not only induce atherosclerosis, but also IR, potentially complicating the interpretation of results; and (3) IR and hyperinsulinemia do not enhance atherosclerosis in LDLR-/- mice, at least under conditions of very high plasma cholesterol levels. The fact that various levels of hypercholesterolemia can be induced in LDLR-/- mice by fat-enriched diets and that such diets induce IR and hyperinsulinemia suggest that LDLR-/- mice may be used as models to elucidate the effect of IR on atherosclerosis, eg, by feeding them Western diets with or without insulin-sensitizing agents." @default.
• W2153688154 created "2016-06-24" @default.
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• W2153688154 date "1999-05-01" @default.
• W2153688154 modified "2023-09-26" @default.
• W2153688154 title "Western-Type Diets Induce Insulin Resistance and Hyperinsulinemia in LDL Receptor-Deficient Mice But Do Not Increase Aortic Atherosclerosis Compared With Normoinsulinemic Mice in Which Similar Plasma Cholesterol Levels Are Achieved by a Fructose-Rich Diet" @default.
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• W2153688154 doi "https://doi.org/10.1161/01.atv.19.5.1223" @default.
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