中国神经再生研究(英文版) ›› 2015, Vol. 10 ›› Issue (3): 467-472.doi: 10.4103/1673-5374.153698

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

乌司他丁可抑制急性百草枯中毒大鼠海马组织内质网应激及细胞凋亡

  

  • 收稿日期:2014-11-14 出版日期:2015-03-20 发布日期:2015-03-20
  • 基金资助:

    2012年国家重点专科建设项目(卫办医政涵[2012]650号)

Ulinastatin suppresses endoplasmic reticulum stress and apoptosis in the hippocampus of rats with acute paraquat poisoning

Hai-feng Li, Shi-xing Zhao, Bao-peng Xing, Ming-li Sun   

  1. Department of Emergency Medicine, the First Hospital of Jilin University-the Eastern Division, Changchun, Jilin Province, China
  • Received:2014-11-14 Online:2015-03-20 Published:2015-03-20
  • Contact: Ming-li Sun, M.D., sunmingli_1972@163.com
  • Supported by:

    This study was supported by a grant from the National Key Specialty Construction Project in China in 2012, No. [2012]650.

摘要:

百草枯中毒以肺损伤为主要表现,目前对百草枯中毒后的脑损伤研究较少见。乌司他丁是一种蛋白酶抑制剂,可有效地稳定溶酶体膜、防止细胞损伤,减少体内自由基的产生。实验希望乌司他丁的这些作用发挥在对急性百草枯中毒脑组织的影响上。为此,建立了百草枯中毒模型大鼠,采用乌司他丁腹腔注射,同时设腹腔注射生理盐水大鼠为对照组。以苏木精伊红染色、Western Blot、免疫组织化学染色和TUNEL检测发现,中毒后第7天,与百草枯中毒大鼠模型相比,乌司他丁腹腔注射模型大鼠海马区仅少数细胞浓缩及核仁消失,海马内质网应激相关蛋白GRP78、细胞凋亡调控相关蛋白caspase3的激活蛋白-Cleaved-caspase3蛋白表达均下降,内质网应激相关蛋白CHOP蛋白免疫阳性反应减弱,凋亡细胞减少。说明急性百草枯中毒可诱发大鼠海马组织内质网发生应激反应。乌司他丁可有效抑制急性百草枯中毒大鼠海马组织内质网应激和细胞凋亡,发挥神经保护效应。

关键词: 神经再生, 百草枯, 中毒, 大鼠, 内质网应激, 细胞凋亡, 乌司他丁, CHOP, GRP78, caspase3, 海马, 凋亡, 活性氧

Abstract:

Lung injury is the main manifestation of paraquat poisoning. Few studies have addressed brain damage after paraquat poisoning. Ulinastatin is a protease inhibitor that can effectively stabilize lysosomal membranes, prevent cell damage, and reduce the production of free radicals. This study assumed that ulinastatin would exert these effects on brain tissues that had been poisoned with paraquat. Rat models of paraquat poisoning were intraperitoneally injected with ulinastatin. Simultaneously, rats in the control group were administered normal saline. Hematoxylin-eosin staining showed that most hippocampal cells were contracted and nucleoli had disappeared in the paraquat group. Fewer cells in the hippocampus were concentrated and nucleoli had disappeared in the ulinastatin group. Western blot assay showed that expressions of GRP78 and cleaved-caspase-3 were significantly lower in the ulinastatin group than in the paraquat group. Immunohistochemical findings showed that CHOP immunoreactivity was significantly lower in the ulinastatin group than in the paraquat group. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling staining showed that the number of apoptotic cells was reduced in the paraquat and ulinastatin groups. These data confirmed that endoplasmic reticular stress can be induced by acute paraquat poisoning. Ulinastatin can effectively inhibit this stress as well as cell apoptosis, thereby exerting a neuroprotective effect.

Key words: nerve regeneration, paraquat, poisoning, rats, endoplasmic reticulum stress, apoptosis, ulinastatin, CHOP, GRP78, caspase-3, hippocampus, reactive oxygen species, neural regeneration