食物中晚期糖基化终产物对5/6肾切除大鼠的肾脏损害作用及其机制

食物中晚期糖基化终产物对5/6肾切除大鼠的肾脏损害作用及其机制

论文摘要

研究背景 晚期糖基化终产物(advanced glycation end products,AGEs)是糖的醛基组和蛋白质的氨基酸组之间非酶性糖基化反应(Maillard反应)的终产物。是多种不同分子结构物质的混合物。目前已明确结构的一些AGEs组分是:戊糖苷、羧甲基赖氨酸(CML)、咪唑鎓盐类(GOLD,MOLD)、咪唑啉酮和吡咯啉等。 正常人体内该反应进行的非常缓慢,通常只发生于某些转换率很低的蛋白质,故各种胶原结构中的AGEs水平随年龄增长而缓慢增加。但在慢性肾功能衰竭时,血浆AGEs的水平比糖尿病患者及肾功能正常者升高约7倍,组织中AGEs的潴留与血浆AGEs的水平升高相一致。造成慢性肾功能衰竭时AGEs蓄积的原因尚不清楚,目前认为除经典的糖基化通路合成增加或者经肾脏排泄AGEs下降外,氧化和羰基应激也具有重要作用。 近年研究发现人类日常饮食中含有大量AGEs,因为食物在加热过程中会产生大量AGEs。研究表明食物中的AGEs约有10%~30%经消化道吸收进入体内,其中主要是低分子量的AGEs,其吸收的量远远超过在高血糖状态下内源性生成的AGEs的量。经消化道吸收的AGEs量与循环AGEs水平直接相关。 目前认为AGEs是一类重要的尿毒症毒素,已经证实AGEs参与透析相关性淀粉样变、加速性动脉粥样硬化等尿毒症并发症的发病机制。动物试验也发现,

论文目录

  • 摘要
  • ABSTRACT
  • 前言
  • 1 材料与方法
  • 1.1 主要试剂
  • 1.2 主要仪器与设备
  • 1.3 高低AGEs大鼠饲料、动物模型制作和分组
  • 1.4 标本收集、处理及观测指标
  • 1.5 统计分析
  • 2 结果
  • 3 讨论
  • 4 结论
  • 5 参考文献
  • 缩略语词汇表
  • 综述
  • 致谢
  • 原创性声明
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    食物中晚期糖基化终产物对5/6肾切除大鼠的肾脏损害作用及其机制
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