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- W2140295514 abstract "In the current study, we examined the mechanisms that regulate hepatic apolipoprotein B (apoB)-containing lipoprotein secretion in Psammomys obesus, a good animal model for the investigation of insulin resistance and diabetes.When fed chow ad libitum, 22% maintained normoglycemia and normoinsulinemia (group A), 33% exhibited normoglycemia and appreciable hyperinsulinemia (group B), and 45% developed overt diabetes (group C). Body weight gain, plasma free fatty acid elevation, hypertriglyceridemia, and hypercholesterolemia characterized groups B and C. Triton WR-1339 injection, at fasting, resulted in higher plasma VLDL-triglyceride and VLDL-apoB accumulation in groups B and C, suggesting increased VLDL production by the liver. Pulse-chase labeling experiments in cultured hepatocytes with [35S]methionine revealed reduced intracellular degradation and enhanced secretion of newly synthesized apoB in groups B and C. Concomitant with the raised triglyceride and cholesterol contents in the livers of groups B and C, there was an increase in lipogenesis and in the activity of microsomal triglyceride transfer protein, monoacylglycerol acyltransferase, and diacylglycerol transferase. Pretreatment of hepatocytes with proteasomal inhibitors eliminated the differences in apoB secretion among groups A, B, and C.Our data indicate that both insulin resistance and diabetes triggered the intracellular machinery involved in VLDL assembly and secretion." @default.
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- W2140295514 date "2004-01-01" @default.
- W2140295514 modified "2023-10-01" @default.
- W2140295514 title "Both Insulin Resistance and Diabetes inPsammomys obesusUpregulate the Hepatic Machinery Involved in Intracellular VLDL Assembly" @default.
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- W2140295514 doi "https://doi.org/10.1161/01.atv.0000105901.18785.99" @default.
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