›› 2013, Vol. 56 ›› Issue (11): 1258-1266.

• 研究论文 • 上一篇    下一篇

吡虫啉对意大利蜜蜂脑乙酰胆碱受体分布的影响

周婷1, 2, 宋怀磊1, 2, 王强1, 2, 代平礼1, 2, 吴艳艳1, 2, 孙继虎3,*   

  1. (1. 中国农业科学院蜜蜂研究所, 北京 100093; 2. 农业部授粉昆虫生物学重点开放实验室, 北京 100093; 3. 第二军医大学生理学教研室, 上海 200433)
  • 出版日期:2013-11-20 发布日期:2013-11-20

Effects of imidacloprid on the distribution of nicotine acetylcholine receptors in the brain of adult honeybee (Apis mellifera ligustica)

ZHOU Ting1,2, SONG Huai-Lei1,2, WANG Qiang1,2, DAI Ping-Li1,2, WU Yan-Yan1,2, SUN Ji-Hu3,*   

  1. (1. Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China; 2. Key Laboratory of Pollinating Insect Biology, Ministry of Agriculture, Beijing 100093, China; 3. Department of Physiology, Second Military Medical University, Shanghai 200433, China)
  • Online:2013-11-20 Published:2013-11-20

摘要: 蜜蜂是自然界主要的授粉昆虫; 新烟碱类杀虫剂(neonicotinoid insecticide)通过结合害虫体内乙酰胆碱受体(nAChR)使害虫致死, 是目前广泛用于田间害虫防控的杀虫剂。本研究以意大利蜜蜂Apis mellifera ligustica和新烟碱类杀虫剂的代表品种吡虫啉为材料, 应用免疫组织化学的方法, 研究了正常成年蜜蜂脑内蘑菇体及视叶nAChR-α7的表达和分布; 分析了亚致死剂量新烟碱类杀虫剂吡虫啉对nAChR-α7表达和分布的影响。结果表明, nAChR-α7在正常蜜蜂脑蘑菇体和视叶中均可检测到, 在蘑菇体中分布相对较少, 但在视叶分布丰富。吡虫啉对nAChR-α7在视叶的表达和分布有显著抑制作用, 但对蘑菇体nAChR-α7的表达没有显著影响。结果提示, 新烟碱类杀虫剂吡虫啉除了文献报道的抑制nAChR的表达外, 还能抑制nAChR-α7的表达量, 这是新烟碱类杀虫剂作用机制的新发现。

关键词: 意大利蜜蜂, 吡虫啉, 乙酰胆碱受体, 脑组织, 免疫组织化学

Abstract: Honeybees are the main pollinators in the nature. Currently neonicotinoid insecticides are widely used in the control of field pests in China due to its ability of binding to nicotinic acetylcholine receptors (nAChR) and inducing pest death. Imidacloprid, a type of neonicotinoid insecticides, was used in this study to observe the distribution of nAChR-α7 in mushroom body and optic lobes in the brain of adult honeybee (Apis mellifera ligustica) with the immunohistochemical staining method. The results showed that nAChR-α7 was detected in the mushroom bodies and optic lobes of normal adult honeybees, with a stronger labeling in optic lobes. The feeding of sublethal doses of imidacloprid induced down-regulation of nAChR-α7 in the optic lobes but not in the mushroom bodies. The results indicate that in addition to the wellknown inhibition of nAChR, the neonicotinoid insecticide imidacloprid can also suppress the expression of nAChR-α7. This finding might present a novel toxic mechanism of neonicotinoid insecticides in killing pests.

Key words: Apis mellifera ligustica, imidacloprid, nicotine acetylcholine receptor, brain tissue, immunohistochemical staining