畜牧兽医学报 ›› 2009, Vol. 40 ›› Issue (6): 928-933.

• 临床兽医 • 上一篇    下一篇

乐果诱导大鼠肝细胞凋亡的分析

刘学忠, 袁燕,袁楷,卞建春,刘宗平*   

  1. 扬州大学兽医学院, 扬州 225009
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-06-26 发布日期:2009-06-26
  • 通讯作者: 刘宗平

Studies on Hepatic Cell Apoptosis Induced by Dimethoate in Rats

LIU Xuezhong, YUAN Yan, YUAN Kai, BIAN Jianchun, LIU Zongping*   

  1. College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-06-26 Published:2009-06-26
  • Contact: LIU Zongping

摘要: 为研究乐果对大鼠肝细胞凋亡的影响,将24只SD大鼠分成对照组和3个染毒组,分别按体质量以0、1、6和30 mg·kg-1的剂量灌服乐果,连续灌服30 d后,观察肝脏组织学和超微结构变化。同时,通过给大鼠肝细胞培养液中加入乐果(染毒终浓度分别为0、3、10、30、100和300 μmol·L-1),染毒12、24 h后,Annexin V/PI双染法检测肝细胞凋亡率;分别用Fluo2/AM、双氢乙酰乙酸二氯荧光黄(DCFHDA)和罗丹明123检测细胞内Ca2+浓度、活性氧(ROS)和线粒体膜电位(Δψm)变化。结果表明,组织学和超微结构检查显示肝细胞脂肪变性、凋亡等。肝细胞染毒12和24 h后,细胞凋亡率明显升高,除3 μmol·L-1组外,与对照组相比差异显著(P<005或P<001),且呈时间剂量效应;3 μmol·L-1组细胞内Ca2+浓度极显著高于对照组(P<001),之后随染毒剂量的增加,细胞内Ca2+浓度逐渐下降;细胞内ROS水平在3~100 μmol·L-1范围内随染毒剂量的增大和染毒时间的延长而升高,而在300 μmol·L-1组略有下降,除3 μmol·L-1组外,与对照组相比均差异极显著(P<001);Δψm除24 h高剂量染毒组(300 μmol·L-1)外均出现持续下降,30~300 μmol·L-1组均小于对照组(P<001)。本研究表明低剂量乐果染毒可诱导肝细胞发生凋亡,细胞内Ca2+、ROS和Δψm可能参与了这一过程。

关键词: 大鼠, 肝脏, 乐果, 细胞凋亡

Abstract: In order to study the histopathological and ultrastructure changes in hepatic cells, twentyfour SD rats were divided into four groups with one control and three experimental groups; Dimethoate was administrated daily intragastrically to SD rats in four groups with concentration of 0, 1, 6 and 30 mg·kg-1 body weight respectivelyMeanwhile,Dimethoate was added to hepatocyte culture fluid of rats with final concentration of 0,3,10,30,100 and 300 μmol·L-1 in each in vitro treatment After 12 and 24 h, apoptosis rate was analyzed by Annexin V/PI method; intracellular Ca2+ concentration, reactive oxygen species (ROS) and mitochondria membrane potential (Δψm) changes were analyzed by Fluo2/AM, Dichlorofluorescin diacetate (DCFHDA ) and rhodamine 123 method respectively to study the effects of Dimethoate on liver cell apoptosis The results showed that adipose degeneration and apoptosis were observed by histopathological and ultrastructure examination After 12 and 24 h exposure, cell apoptosis rate increased significantly; experimental groups (apart from the group with 3 mmol·L-1) had significant (P<005 or P<001) differences with control group and followed dose proportionality. Intracellular Ca2+ concentration in group with 3 mmol·L-1 was significantly (P<001) higher than that of control group, and then the concentration decreased with increasing dosage. Intracellular ROS level increased with increasing dosage and time of exposure in the range of 3-100 μmol·L-1; however, ROS level decreased slightly in group with 300 μmol·L-1. Apart from group with 3 μmol·L-1, the differences between control group and experimental groups were significant (P<001). Δψm decreased continuously apart from group with 300 μmol·L-1 after 24 h exposure.The Δψm of 30-300 μmol·L-1 groups were significantly lower than that of control (P<001). It was concluded that low dosage of Dimethoate can induce liver cell apoptosis, and intracellular Ca2+, ROS and Δψm may participate in this process.

Key words: rat, liver, Dimethoate, apoptosis