Toxicological Research

  • 제29권3호
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  • Pages.173-179
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  • 2013
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  • 1976-8257(pISSN)
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  • 2234-2753(eISSN)
한국독성학회 (Korean Society of Toxicology & Korea Environmental Mutagen Society)
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Gastrointestinal Tract Abnormalities Induced by Prenatal Valproic Acid Exposure in Rat Offspring

  • Kim, Ji-Woon (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Choi, Chang Soon (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Kim, Ki Chan (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Park, Jin Hee (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Seung, Hana (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Joo, So Hyun (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Yang, Sung Min (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Shin, Chan Young (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University) ;
  • Park, Seung Hwa (Department of Neuroscience, School of Medicine and Center for Neuroscience Research, SMART Institute of Advanced Biomedical Sciences, Konkuk University)
  • 투고 : 2013.09.09
  • 심사 : 2013.09.27
  • 발행 : 2013.09.30
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초록

In-utero exposure to valproic acid (VPA) has been known as a potent inducer of autism spectrum disorder (ASD), not only in humans, but also in animals. In addition to the defects in communication and social interaction as well as repetitive behaviors, ASD patients usually suffer from gastrointestinal (GI) problems. However, the exact mechanism underlying these disorders is not known. In this study, we examined the gross GI tract structure and GI motility in a VPA animal model of ASD. On embryonic day 12 (E12), 4 pregnant Sprague-Dawley (SD) rats were subcutaneously injected with VPA (400 mg/kg) in the treatment group, and with phosphate buffered saline (PBS) in the control group; the resulting male offspring were analyzed at 4 weeks of age. VPA exposure decreased the thickness of tunica mucosa and tunica muscularis in the stomach and ileum. Other regions such as duodenum, jejunum, and colon did not show a significant difference. In high-resolution microscopic observation, atrophy of the parietal and chief cells in the stomach and absorptive cells in the ileum was observed. In addition, decreased staining of the epithelial cells was observed in the hematoxylin and eosin (H&E)-stained ileum section. Furthermore, decreased motility in GI tract was also observed in rat offspring prenatally exposed to VPA. However, the mechanism underlying GI tract defects in VPA animal model as well as the association between abnormal GI structure and function with ASD is yet to be clearly understood. Nevertheless, the results from the present study suggest that this VPA ASD model undergoes abnormal changes in the GI structure and function, which in turn could provide beneficial clues pertaining to the pathophysiological relevance of GI complications and ASD phenotypes.

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