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长期接触低剂量氯化甲基汞对发育阶段大鼠小脑蛋白激酶C活性的影响

郭 杰1,毕晓颖1,雷翠萍2,李永进1,李志超1*   

  1. 1. 吉林大学公共卫生学院卫生毒理学教研室,吉林 长春 130021;2. 中国疾病预防控制中心辐射安全所,北京 100088 
  • 收稿日期:2005-06-16 修回日期:1900-01-01 出版日期:2006-05-28 发布日期:2006-05-28
  • 通讯作者: 李志超

Effects of chronic mthylmercury chloride exposure on activityof protein kinase C in rat cerebellum during development

GUO Jie1,BI Xiao-ying1,LEI Cui-ping2,LI Yong-jin1,LI Zhi-chao1*

  1. 1. Department of Health Toxicology, School of Public Health, Changchun 130021, China;2.Institute of Radiation Safety, Chinese Center of Disease Prevention and Control, Beijing 100088,China
  • Received:2005-06-16 Revised:1900-01-01 Online:2006-05-28 Published:2006-05-28
  • Contact: LI Zhi-chao

摘要: 目的:探讨氯化甲基汞(mthylmercury chloride,MMC)对发育大鼠小脑组织蛋白激酶C(PKC )活性的影响。方法:实验组母鼠从妊娠前90 d至仔鼠出生后30 d连续喂饲含有不同剂量MMC(0.75、1.50和3.00 mg·kg-1)的普通饲料,取其生后(Postnatal day, PND)3、7、14、21和30 d仔鼠小脑组织提取胞浆和胞膜PKC。采用改良Takai法观察MMC对发育大鼠小脑PKC活性的影响。结果:实验组生后不同时间仔鼠小脑组织胞浆和胞膜PKC活性均高于相应对照组,其中实验组Ⅰ(0.75 mg·kg-1 MMC)PND 3、7和14 d,实验组Ⅱ (1.5 mg·kg-1 MMC)和实验组Ⅲ (3.0 mg·kg-1 MMC)仔鼠小脑组织胞浆和胞膜PKC活性明显高于对照组(P<0.05)。结论:MMC可能通过影响大鼠脑发育过程中PKC活性介导其神经毒性作用。

关键词: 毒性, 蛋白激酶C, 汞中毒, 神经系统, 动物, 实验 

Abstract: Objective To study the effects of methylmercury chloride (MMC) on protein kinase C (PKC) activities in rat developing cerebellum. Methods The animals in experimental groups were fed standard ra t chow with 0.75 mg MMC (ExpⅠ),1.5 mg MMC (ExpⅡ) and 3.0 mg MMC (ExpⅢ) respectively for 90 d before gestation to 30 d post parturition. Cerebella of pups from each group on postnatal days (PND) 3, 7,17,21 and 30 were dissected. All the samples were separated into cytosol and membrane subcellular fractions and assay ed for PKC activity by the improved method from Takai′s. Results Membrane and cytosolic PKC activities of pups′ cerebella from certain experimental groups were significantly higher than those of corresponding control group, PKC activities of rats from ExpⅡ, ExpⅢ and PND 3,7,14 in ExpⅠwere significantly higher than those in control group (P<0.05).Conclusion The damage of the rat developing cerebellum by chronic exposure to MMC is possibly correlative with the enhanced effect of MMC on PKC activity.

Key words: toxicity, protein kinase C, mercury poisoning, nervous system, animal, laboratory

中图分类号: 

  • R135.13