肝性脂酶及脂蛋白脂酶在兔胆囊结石形成过程中的变化及意义

为研究肝脂酶及脂蛋白脂酶在胆固醇结石成石过程中的变化及其对成石的影响,采用高胆固醇膳食诱发兔胆囊胆固醇结石模型,观测对照组及高胆固醇膳食1、2 、3、4周组动物血浆脂蛋白脂酶(LPL)、肝脂酶(HL)活性、血浆脂蛋白胆固醇及胆汁中甘氨胆酸(GCA)、甘氨脱氧胆酸(GDCA)、胆固醇的变化.结果显示:随着进食高胆固醇膳食时间的增加,血中LPL活性增高明显(P＜0.05);HL活性也逐渐升高,3周组及4 周组与对照组差异显著(P＜0.05);血中VLDL-C、LDL-C及胆汁中胆固醇也明显升高(P ＜0.05);而血中 HDL-C、HDL2-C及HDL3-C以及胆汁中GCA、GDCA无明显变化(P＞0.05).结果表明:LPL及HL活性升高可能使肝脏摄取及向胆汁中排泌胆固醇增加,进而影响结石形成.

Changes of Lipoprotein Lipase and Hepatic Lipase and Their Significance in Gal l stone Formation in Rabbit Model

This experiment was made to investigate the changes of lipoprotein lipase(LPL) and hepatic lipase (HL) activity and their effects on gallstone formation in rabbit model in which the stones were induced by high cholesterol diet. Activities of plasma LPL and HL were determined; other data including concentration of plasma lipoprotein cholesterol, concentration of bile cholesterol and bile acids were also obtained. The results showed that with the rabbits continuously fed on high cholesterol diet, LPL activity heightened markedly (P<0.05), and HL activity increased gradually (3 and 4 weeks groups vs control group, P<0.05). The changes of concentration of plasma VLDL-C and LDL-C were the same as that of LPL activity, but the concentration of plasma HDL-C, HDL2-C, HDL3-C and bile acids showed no significant changes (P >0.05). These results suggest that the heightened activities of LPL and HL might make the liver take up more cholesterol, secrete it into the bile duct and hence accelerate gallstone formation.