华东师范大学学报(自然科学版) ›› 2017, Vol. ›› Issue (4): 168-179.doi: 10.3969/j.issn.1000-5641.2017.04.015

• 生命科学 • 上一篇    

Cd2+Cypridopsis vidua(介形纲)肠壁结构的毒性效应

陈仕梅1, 李丹妮1, 丁晴晴1, 禹娜1,2   

  1. 1. 华东师范大学 生命科学学院, 上海 200240;
    2.华东师范大学 教师教育学院, 上海 200062
  • 收稿日期:2016-09-12 出版日期:2017-07-25 发布日期:2017-07-20
  • 通讯作者: 禹娜,女,教授,博士生导师,研究方向为水生动物生态学.E-mail:nyu@bio.ecnu.edu.cn. E-mail:nyu@bio.ecnu.edu.cn
  • 作者简介:陈仕梅,女,硕士研究生,研究方向动物毒理学.
  • 基金资助:
    公益性行业(农业)科研专项项目(201203065-04);国家自然科学基金(31672263,41372365)

Toxic effects of Cd2+ on the intestinal structure of Cypridopsis vidua (Ostracoda)

CHEN Shi-mei1, Li Dan-ni1, Ding Qing-qing1, YU Na1,2   

  1. 1. School of Life Science, East China Normal University, Shanghai 200240, China;
    2. College of Teacher Education, East China Normal University, Shanghai 200062, China
  • Received:2016-09-12 Online:2017-07-25 Published:2017-07-20

摘要: Cypridopsis vidua是少数能在重污染水体中生存的介形类之一.本文采用急性毒性实验方法,研究了Cd2+对介形类C.vidua及其肠壁结构的影响,结果表明,24、48、72和96h时Cd2+C.vidua的半致死浓度(LC50)分别为5.00、2.01、0.46和0.14 mg/L,安全浓度为0.014 mg/L.在急性毒性试验的基础上,于安全浓度上下分别设置了两个Cd2+实验浓度对介形类进行攻毒研究,目的是进一步探讨在安全浓度附近,Cd2+C.vidua肠壁细胞的损伤情况,实验持续7 d.显微结果显示,在安全浓度以下时,C.vidua的胃肠道结构基本没有受到损伤,但超过安全浓度后,C.vidua的胃肠道结构损伤程度于96h以内表现出了一定的时间和剂量效应,但至第7天时部分幸存下来的C.vidua其受损胃肠道结构出现一定程度的恢复,但已无法恢复到最初的状态了;亚显微切片显示,肠壁细胞的膜结构、胞质、胞器等均有不同程度的损伤,且随镉离子浓度的升高损伤明显加剧,其中细胞的膜结构损伤尤为严重.

关键词: 介形类, Cd2+, 急性毒性, 肠壁结构

Abstract: Cypridopsis vidua is one of the few ostracods which can surrive from heavy pollution water. The toxic effects of Cd2+ on C. vidua and its intestinal ultrastructure were examined using a static renewal system. The LC50 values for cadmium in C. vidua were 5.00, 2.01, 0.46 and 0.14 mg/L at 24, 48, 72 and 96 h exposure respectively, and the safe concentration of Cd2+ for long-term C. vidua survival was less than 0.014 mg/L. To observe the structure changes of its intestinal, four Cd2+ concentrations were set up, and two of them were below the safe concentration of Cd2+ (0.001 and 0.004 mg/L) and the other concentrations were above its safe concentration (0.016 and 0.064 mg/L). The experiment lasted for 7 days. When microstructure of C. vidua was observed, the gastrointestinal orga- nization was not damaged below the safe concentration; while the degree of injury showed a certain amount of time and dose effects in 24-72 hours above the safe concentration, and some structures among those surviving animals were slightly recovered in 7 days under same concentration. Sub-microscopic analysis of intestinal cells of C. vidua in two concentrations (0.004 and 0.064 mg/L) groups showed, different degrees of structure damage were found in the cell membrane, cytoplasm and organelles, which worsened with increasing Cd2+ con- centrations. Among these cellular structures, the damage to the membrane system of the cell was especially serious.

Key words: Ostracoda, Cd2+, acute toxicity, intestinal ultrastructure

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