In utero and lactational exposure to low doses of chlorinated and brominated dioxins induces deficits in the fear memory of male mice

Asahi Haijima, Toshihiro Endo, Yan Zhang, Wataru Miyazaki, Masaki Kakeyama, Chiharu Tohyama

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Environmental-level in utero and lactational exposures to dioxins have been considered to affect brain functions of offspring. Here, we determined whether in utero and lactational exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and 2,3,7,8-tetrabromodibenzo-p-dioxin (TBDD), at the dose that does not harm the dams, affects the acquisition and retention of fear memory in mouse offspring. Pregnant C57BL/6J mice were administered by gavages TCDD or TBDD at a dose of 0 or 3.0μg/kg body weight on gestation day 12.5, and their male offspring were examined for their behavior in adulthood. In the fear conditioning, a paired presentation of tone and foot shock was repeated three times, and retention tests for contextual and auditory fear memory were carried out 1 and 24. h after the fear conditioning. Groups of mice that were exposed to TCDD and TBDD in utero and via lactation showed deficits in the contextual and auditory retention tests at 1 and 24. h retention intervals. The present results suggest that maternal exposure to a low dose of TCDD or TBDD disrupts the functions of memory and emotion in male mouse offspring, and that the developmental toxicities of these chemicals are similar to each other.

Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalNeuroToxicology
Volume31
Issue number4
DOIs
Publication statusPublished - 2010 Aug 1
Externally publishedYes

Keywords

  • 2,3,7,8-tetrabromodibenzo-p-dioxin
  • 2,3,7,8-tetrachlorodibenzo-p-dioxin
  • Fear conditioning
  • In utero and lactational exposure
  • Mice

ASJC Scopus subject areas

  • Neuroscience(all)
  • Toxicology

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