Diabetes-induced accelerated atherosclerosis in swine

被引:210
作者
Gerrity, RG
Natarajan, R
Nadler, JL
Kimsey, T
机构
[1] Med Coll Georgia, Dept Pathol, Augusta, GA 30912 USA
[2] City Hope Natl Med Ctr, Beckman Res Inst, Gonda Diabet Ctr, Duarte, CA 91010 USA
[3] Univ Virginia, Hlth Sci Ctr, Div Endocrinol & Metab, Charlottesville, VA USA
关键词
D O I
10.2337/diabetes.50.7.1654
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Patients with diabetes are at higher risk for atherosclerotic disease than nondiabetic individuals with other comparable risk factors, Studies examining mechanisms underlying diabetes-accelerated atherosclerosis have been limited by the lack of suitable humanoid animal models, In this study, diabetes was superimposed on a well-characterized swine model of atherosclerosis by injection of the p-cell cytotoxin streptozotocin (STZ), resulting in a >80% reduction in beta -cells and an increase in plasma glucose to diabetic levels. Animals were maintained without exogenous insulin for up to 48 weeks. Plasma:glucose and cholesterol levels and lesion extent and severity were quantified in swine with diabetes and hyperlipemia alone and in combination compared with controls, Diabetes had no effect on plasma cholesterol levels, but diabetic/hyperlipemic (D-HL) swine developed hypertriglyceridemia and showed a doubling in aortic sudanophilia over nondiabetic/hyperlipemic (NHL) swine as early as 12 weeks (47.25 +/- 4.5 vs, 24.0 +/- 4.6%). At 20 weeks, coronary artery stenosis was significantly greater in D-HL than in N-HL animals (86 +/- 10 vs. 46 +/- 8%), Coronary lesions predominantly arose in the first 2-3 cm of the vessels and displayed humanoid morphology, Aortic lesions in D-HL swine had double the cholesterol content of those in N-HL swine, and incorporation of oleate into cholesteryl ester was Significantly greater in grossly normal aortic areas of D-HL swine compared with N-HL and was attributed to similar elevated incorporation in monocytes, This large study demonstrates that a model of diabetes with humanoid characteristics, including hypertriglyceridemia and severe, accelerated atherosclerosis can be reproducibly induced-and maintained in swine. This model should potentially be of great value in elucidating mechanisms underlying the accelerated atherosclerosis seen in human diabetic individuals.
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页码:1654 / 1665
页数:12
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