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Neurobehavioral assessment of combined exposure to methylmercury and PCB in mice

Research Project

Project/Area Number 17390167
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Hygiene
Research InstitutionTohoku University

Principal Investigator

NAKAI Kunihiko  Tohoku University, Graduate school of Medicine, Associate Professor, 大学院医学系研究科, 助教授 (00291336)

Co-Investigator(Kenkyū-buntansha) SATOH Hiroshi  Tohoku University, Graduate School of Medicine, Professor, 大学院医学系研究科, 教授 (40125571)
KAMEO Satomi  Tohoku University, Graduate School of Medicine Research Associate, 大学院医学系研究科, 助手 (40312558)
SUGAWARA Norio  Hirosaki University, school of Medicihe, Research Associate, 医学部, 助手 (80431435)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥12,700,000 (Direct Cost: ¥12,700,000)
Fiscal Year 2006: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 2005: ¥7,400,000 (Direct Cost: ¥7,400,000)
Keywordsmethylmercury / PCBs / environmental pollutant / combined exposure / neurobehavioral development / perinatal exposure / PCB / 環境汚染化学物質
Research Abstract

Polychlorinated biphenyls (PCBs) and Methylmercury (MeHg) are environmental pollutants that cause neurobehavioral deficits in human. Because the exposures to MeHg and PCBs occur through fish-eating, the interaction of PCB and MeHg should be considered to clarify the exact adverse effects. We therefore investigated the effects of perinatal exposure to MeHg and PCBs in mice. Female mice (C57BL/6Cr) were divided into four groups by the exposures : 1) vehicle control, 2) MeHg alone, 3) PCBs alone, 4) MeHg + PCBs. The MeHg exposed groups fed diet containing 5 ppm MeHg (as Hg) beginning 4 weeks prior to mating, and through pregnancy and lactation. The PCBs exposed groups received a commercial mixture of PCBs (Aroclor 1254) at a dose of 18 mg/kg body-weight in 10 ml/kg corn oil by gavage every 3 days from 5 days after breeding and continued through postnatal day (PND)20. Before weaning, assessment of eye opening revealed the interactive effect between Mel-1g and PCBs on PND12. We also observed the delays of grasp reflex on PND12 and 14. When the offspring were at 8 weeks olds, the group exposed to PCBs alone showed increasing number of defecation and urination in an open field test. Analysis of the latency revealed the interaction between two exposures. Treatment with MeHg decreased the distance and interacted with PCBs exposure. Water maze test shows that treatment with MeHg prolonged the time to reach the platform, but this effect did not interact with PCBs exposure. Spontaneous locomotion activity was not affected by exposure at 9 weeks olds. These behavioral changes did not accompany with any histopathological changes in brains. These findings showed that perinatal combined exposure to MeHg and PCBs does not produce additive or synergistic effects.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (8 results)

All 2006 2005

All Journal Article (6 results) Book (2 results)

  • [Journal Article] Developmental and neurobehavioral effects of perinatal exposure to polychlorinated biphenyls in mice2006

    • Author(s)
      Sugawara N, et al.
    • Journal Title

      Arch Toxicol 80

      Pages: 286-292

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Developmental and neurobehavioral effects of perinatal exposure to polychlorinated biphenyls in mice.2006

    • Author(s)
      Sugawara N, Nakai K, Nakamura T, Ohba T, Suzuki K, Kameo S, Satoh C, Satoh H.
    • Journal Title

      Arch Toxicol 80

      Pages: 286-292

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Developmental and neurobehavioral effects of perinatal exposure to polychlorinated biphenyls in mice.2006

    • Author(s)
      Sugawara N, et al.
    • Journal Title

      Arch Toxicol 80

      Pages: 286-292

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Developmental and neurobehavioral effects of perinatal exposure to polychlorinated biophenyls in mice.2006

    • Author(s)
      Sugawara N, et al.
    • Journal Title

      Arch Toxicol (In press)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Metal components analysis of metallothionein-III in the brain sections of metallothionein-I and metallothionei-II null mice exposed to mercury vapor with HPLC/ICP-MS.2005

    • Author(s)
      Kameo S, et al.
    • Journal Title

      Anal Bioanal Chem 381

      Pages: 1514-1519

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Difference in methylmercury exposure to fetus and breast-feeding offspring : a mini-review.2005

    • Author(s)
      Sakamoto M, et al.
    • Journal Title

      Kor J Environ Health 31

      Pages: 179-186

    • Related Report
      2005 Annual Research Report
  • [Book] Proceedings of NIMD Forum 2006. Recent Topics of Fetal Methylmercury Exposure and its effects.2006

    • Author(s)
      Sugawara N, et al.
    • Publisher
      National Institute for Minamata Disease
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Book] National Institute for Minamata Disease2006

    • Author(s)
      Sagawara N, et al.
    • Total Pages
      13
    • Publisher
      Proceedings of NIMD Forum 2006. Recent Topics of Fetal Methylmercury Exposure and its effects
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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