Endosulfan exposure inhibits brain AChE activity and impairs swimming performance in adult zebrafish (Danio rerio)

详细信息	查看全文 | 推荐本文 |

• 作者：Vanessa Maynart Pereira^a ; Josiane Woutheres Bortolotto^b ; Luiza Wilges Kist^a ; Mariana Barbieri de Azevedo^a ; Rachel Seemann Fritsch^a ; Renata da Luz Oliveira^b ; Talita Carneiro Brandã ; o Pereira^a ; Carla Denise Bonan^b ; ^d ; Monica Ryff Vianna^c ; ^d ; Maurí ; cio Reis Bogo^a ; ^d ; ^{mbogo@pucrs.br}
• 关键词：Organochlorines ; Endosulfan ; Neurotoxicity ; Acetylcholinesterase ; Altered-behavior ; Zebrafish
• 刊名：Neurotoxicology
• 出版年：2012
• 期刊代码：35_0161813x
• 类别：pha
• 出版时间：June, 2012
• 卷：33
• 期：3
• 页码：469-475
• 文件大小：504 K

摘要

Endosulfan is a broad spectrum organochlorine pesticide that is still widely in use in many developing countries. Following application, endosulfan can get to watercourses through surface runoff from agricultural fields and disturb the non-target aquatic animals including freshwater fish species. Given that the activity of the enzyme acetylcholinesterase (AChE) is one of the most recurrently used biomarkers of exposure to pesticides and there are controversial results concerning the effects of endosulfan exposure and AChE activity in fish, the aim of the present study was to evaluate the effects of endosulfan in brain AChE activity and its gene expression pattern using adult zebrafish (m>Danio reriom>) as an animal model. Moreover, we have analyzed the effects of endosulfan exposure in different parameters of zebrafish swimming activity and in long-term memory formation. After 96 h of exposition, fish in the 2.4 渭g endosulfan/L group presented a significant decrease in AChE activity (9.44 卤 1.038 渭mol SCh h^鈭? mg protein^鈭?; m>pm> = 0.0205) when compared to the control group (15.87 卤 1.768 渭mol SCh h^鈭? mg protein^鈭?; m>pm> = 0.0205) which corresponds to approximately 40%. The down-regulation of brain AChE activity is not directly related with the transcriptional control as demonstrated by the RT-qPCR analysis. Our results reinforce AChE activity inhibition as a pathway of endosulfan-induced toxicity in brain of fish species. In addition, exposure to 2.4 渭g endosulfan/L during 96 h impaired all exploratory parameters evaluated: decreased line crossings (鈮?1%, 273.7 卤 28.12 number of line crossings compared to the control group 344.6 卤 21.30, m>pm> = 0.0483), traveled distance (鈮?0%, 23.44 卤 2.127 m compared to the control group 29.39 卤 1.585, m>pm> = 0.0281), mean speed (鈮?5%, 0.03 卤 0.003 m/s compared to the control group 0.04 卤 0.002, m>pm> = 0.0275) and body turn angle (鈮?1%, 69,940 卤 4871 absolute turn angle compared to the control group 88,010 卤 4560, m>pm> = 0.0114). These results suggest that endosulfan exposure significantly impairs animals鈥?exploratory performance, and potentially compromises their ecological and interspecific interaction. Our results also showed that the same endosulfan exposure did not compromise animals鈥?performance in the inhibitory avoidance apparatus. These findings provide further evidence of the deleterious effects of endosulfan exposure in the nervous system.