V L D L METABOLISM IN EXPERIMENTAL DIABETES MELLITUS

糖尿病与动脉粥样硬化风险增加有关 这可能与脂质代谢的改变有关。 整体 本研究的目的是确定 极低密度脂蛋白实验性糖尿病 （VLDL）代谢。 为了实现这一目标， 将追求以下具体目标：1）125 I-VLDL的清除 将在体内测量糖尿病大鼠和对照大鼠的载脂蛋白， 在隔离的肝脏灌注中。 特别是，是否存在 选择性清除任一种主要形式的载脂蛋白B 将被确定。 2)胰岛素和甲状腺激素参与 将研究糖尿病患者中载脂蛋白清除率的控制。 3)糖尿病动物载脂蛋白的糖基化程度 糖基化对载脂蛋白的影响 将确定清除。 4)脂蛋白脂酶活性和 将在糖尿病大鼠中测量肝脂肪酶。 的影响 载脂蛋白在脂蛋白脂酶和肝脂酶上的糖基化 活动将被调查。 糖尿病模型将用于这些 实验将是链脲佐菌素糖尿病大鼠。 糖尿病将是 以65 mg/kg体重的剂量注射链脲佐菌素诱导。 大鼠将维持胰岛素一周，以最大限度地减少直接 链脲佐菌素的毒性作用，那么胰岛素将被撤回， 在任何实验程序之前至少3天。

Diabetes mellitus is associated with an increased risk of atherosclerosis that may be associated with alterations in lipid metabolism. The overall objective of this study is to determine the effects of experimentally-induced diabetes mellitus on very-low-density-lipoprotein (VLDL) metabolism in the rat. In order to accomplish this objective, the following specific aims will be pursued: 1) Clearance of 125I-VLDL apolipoproteins by diabetic and control rats will be measured in vivo and in isolated liver perfusions. In particular, the presence or absence of selective clearance of either of the predominant forms of apolipoprotein B will be determined. 2) The involvement of insulin and thyroid hormones in the control of apolipoprotein clearance in diabetics will be investigated. 3) The degree of glycosylation of apolipoproteins from diabetic animals will be measured, and the effects of glycosylation on apolipoprotein clearance will be determined. 4) Activity of lipoprotein lipase and hepatic lipase will be measured in diabetic rats. The effects of glycosylation of apolipoproteins on lipoprotein lipase and hepatic lipase activities will be investigated. The model of diabetes to be used in these experiments will be the streptozotocin-diabetic rat. Diabetes will be induced by injection of streptozotocin at a dose of 65 mg/kg body weight. Rats will be maintained on insulin for one week in order to minimize direct toxic effects of streptozotocin, then insulin will be withdrawn for at least 3 days prior to any experimental procedures.