Life-time exposure to dichlorvos affects behaviour of mature rats

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Wistar rats were exposed to dichlorvos [CAS number 62737]. Doses were 1/25; 1/50; 1/75; and 1/100 LD50, that is 3.88; 1.94; 1.46; and 0.97 mg kg-1 DDVP, respectively, throughout gestation (GD1-birth) and during suckling via oral dosing to the dams, and then via the same doses by gavage for the rest of their lives. The offspring were tested in an open field (OF), a multiple T-maze, and in a ‘novelty-induced- grooming’ test to assess behavioural competence as adults. Dose-related increases in running time and incorrect choices in the maze were observed during the first 2 weeks of a 3-week study at 9-11 weeks of age. Horizontal activity was increased, vertical activity decreased, and defecation decreased in the OF at 9-12 weeks of age; these changes were again dose-related. Sleep was also affected at 12 weeks of age. AChE activity in the brain and in blood at sacrifice was roughly 40% to 65% of control, again reflect ing the doses administered. The significantly changed behavioural profile of DDVP treated rats may serve as a useful biomarker to judge functional damage of CNS prop erties.

Original languageEnglish
Pages (from-to)721-726
Number of pages6
JournalHuman & Experimental Toxicology
Issue number9
Publication statusPublished - Sep 1995



  • acetylcholine esterase
  • dichloro-vinyl-phosphate
  • dichlorvos
  • maze learning
  • novelty
  • open-field behaviour
  • rats

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis

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