缺血预处理减轻大鼠供肝冷保存损伤的作用及其机制  

Effects of ischemic preconditioning on cholesterol content and activity of Na+ -K+ -ATPase of hepatocytes followingcoldpreservationinrats

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作  者:鞠卫强[1] 吴志鹏[1] 何晓顺[1] 郭志勇[1] 巫林伟[1] 王东平[1] 朱晓峰[1] 黄洁夫[1] 

机构地区:[1]中山大学附属第一医院器官移植科,广州510080

出  处:《中华器官移植杂志》2012年第3期156-159,共4页Chinese Journal of Organ Transplantation

基  金:国家自然科学基金(30972951);广东省科技计划项目(20108031600200)

摘  要:目的研究缺血预处理对大鼠冷保存供肝细胞质膜胆固醇含量和Na+-K+-ATP酶活性的影响,以探讨缺血预处理减轻大鼠供肝冷保存损伤的可能机制。方法将25只SD大鼠随机分为对照组、冷保存组、缺血预处理组、30和100μmol/L阿托伐他汀处理组(A30组和A100组),共5组,每组5只。分别测定5组大鼠肝细胞质膜胆固醇含量、磷脂含量及Na+K+-ATP酶活性。结果对照组、冷保存组、缺血预处理组、A30组及A100组大鼠肝组织细胞质膜的胆固醇含量分别为(310.4±27.5)、(187.7±13.1)、(394.3±25.9)、(201.8±14.6)和(122.6±7.7)nmol/mg蛋白,Na+K+-ATP酶的活性分别为(46.55±3.20)、(27.4±2.81)、(52.71±3.02)、(30.67±2.78)和(19.64±2.11)μmol Pi·mg蛋白-1·h-1,5组问细胞质膜胆固醇含量及Na+-K+-ATP酶的活性的两两比较,差异均有统计学意义(P〈0.05);而5组间细胞质膜磷脂含量的两两比较,差异均无统计学意义(P〉0.05)。结论肝细胞质膜胆固醇含量和NatKtATP酶活性下降是造成供肝冷保存损伤的因素之一,而缺血预处理可以明显改善细胞质膜Na+K+-ATP酶的活性,并升高细胞质膜胆固醇含量。使用阿托伐他汀能够降低细胞质膜胆固醇的合成,使Na+K+-ATP酶的活性明显下降,从而减轻供肝的冷保存损伤。Objective To investigate the effects of ischemic preconditioning on the cholesterol content and the activity of Na+ -K+ -ATPase of hepatocytes following cold preservation in rats. Methods Twenty-five rats were randomly divided into five groups, including control group (C), cold preservation group (I), ischemic preconditioning group (IP), atorvastatin (30μmol/L) treatment group (A30), and atorvastatin (100μmol/L) treatment group (A100). The cholesterol content and the activity of Na+-K+ -ATPase were assessed. Results The cholesterol contents on the rat liver tissue cell membrane in the C group, I group, IP group, A30 group and A100 group were (310. 4 ±27.5), (187.7±13.1), (394.3±25.9), (201.8±14.6) and (122.6±7.7) nmol/mg protein, and activity of the Na+-K+ -ATP enzyme was (46. 55±3. 20), (27. 4±2. 81), (52.71±3.02), (30. 67 ±2. 78) and (19. 64±2. 11)μmol Pi/hr mg protein, respectively (P〈0. 05). There was no significant difference in the plasma membrane phospholipid content among the five groups (P〉0.05). Conclusion Reduction of cholesterol content and Na+ -K+ -ATPase activity on the liver cytoplasmic membrane is one of the factors causing donor liver cold preservation injury, but isehemic preconditioning can significantly improve cell membrane Na+ K+ -ATPase activity and increase cytoplasmic membrane cholesterol content. Use of atorvastatin statins can reduce cytoplasmic membrane cholesterol synthesis, and significantly decrease Na+ -K + -ATPase activity, thereby alleviating the donor liver cold preservation injury.

关 键 词:大鼠  器官保存 损伤 缺血预处理 

分 类 号:R657.3[医药卫生—外科学]

 

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