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Toxicity and its mechanism of dioxin-like chemicals in infants through their mothers exposed during a pregnancy and lactational period.

Research Project

Project/Area Number 12671064
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Embryonic/Neonatal medicine
Research InstitutionTokyo Woman's Medical University (2001-2002)
Tottori University (2000)

Principal Investigator

KONO Yumi  Tokyo Woman's Medical University, Faculty of Medicine, Assistant Professor, 医学部, 講師 (50243390)

Co-Investigator(Kenkyū-buntansha) 三科 潤  東京女子医科大学, 医学部, 助教授 (60277192)
MURA Tetsuo  Tokyo Woman's Medical University, Faculty of Medicine, Associate Professor, 医学部, 助教授 (80093631)
神崎 晋  鳥取大学, 医学部, 教授 (90224873)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsdioxin / lactation / newborn rat / CYP1A1 / antioxidant enzyme / RT-PCR / ダイオキシン / 胎児 / 新生児 / CYP1B1 / 臍帯血 / 喫煙 / neonate / 授乳
Research Abstract

The aim of this study was to assess the potency of the biological action of dioxins via lactation on the gene expression in neonates. Maternal rats were treated with a single dose of 50 or 100 mmol/kg 1, 2, 3, 4 - tetrachlorodibenzo-p-dioxin (1, 2, 3, 4 - TCDD), a low potent congener of dioxins, on the first day postpartum (day 1). Induction of CYP1A1 mRNA and other CYP isoenzymes mRNA was quantitatively analyzed by the competitive RT-PCR method. To assess the response to dioxin-induced oxidative stress in neonates via lactation, mRNA expression of the key antioxidant enzymes (AOEs) ; such as ph-GPx, cell-GPx, CuZn-SOD, Mn-SOD and catalse (CAT), were also determined.
The mRNA ratios of CYP 1A1 to β-actin in neonates were dose-dependently increased by the treatment of 1, 2, 3, 4 - TCDD of their mothers. The effect was at its peak on day 6 and sustained at the same level on day 10. Increases of the ratio with 100 mmol/kg 1, 2, 3, 4 ? TCDD on day 2, 6, and 10 were 26-, 40-, and 40-fold of the appropriate controls, respectively. Quantitative analysis of AOEs mRNA showed that ph-GPx and cell-GPx mRNA as well as CuZn-SOD and CAT mRNA in the neonatal liver were suppressed on day2 and returned to the control levels on d 6 and thereafter increased higher than the controls on d 10.
Although the dose of 1, 2, 3, 4 - TCDD selected in this study was about 5000 times higher than the daily intake of dioxins in breast-fed infants, CYP1A1 mRNA was highly induced for a longer period of time than the treated maternal rats. AOE mRNA in the neonatal liver was suppressed only on day 2, probably reflecting increase of lipid peroxidation. Dioxin itself and induced oxidative stress by lactational transfer alters CYP gene expression and may affect the physiological response to oxidative stress.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Kono Y, et al.: "Effect of 1,2,3,4-TCDD on the mRNA expression of cytochrome P450 isoenzymes in the neonatal rat liver via lactation"J Pediatric Gastroenterol Nutri. 31. S184-S184 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tazawa Y, et al.: "Infantile chole static jaundice associated with adult-onset type II citrullinemia"J Pediatr. 138. 735-740 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, et al.: "Messenger RNA expression on antioxidant eznymes in the neonatal rat liver exposed to 1,2,3,4-TCDD via lactation"Environmental Sciences. 8. 128-129 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 河野由美, 他: "肝臓の疾患-体質性黄疸"周産期医学. 31. 669-673 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, et al.: "The effect of lactational exposure to 1,2,3,4-tetrachlorodiben30-p-dioxin on cytochrome p-450 1A1 mRNA in the neonatal rat liver"Pediatri Int. 43. 458-464 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, et al.: "Messenger RNA expression of anti oxidant enzymes in the neonatal rat liver exposed to 1,2,3,4-TCDD via lactation"Pediatri Int. 44. 481-487 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, Okada S, Tazawa Y, Kanzaki S, Mura T, Ueta E, Nanba E: "Effects of 1, 2, 3, 4 - TCDD on the mRNA expression of cytochrome P450 isoenzymes in the neonatal rat liver via lactation."J Pediatric Gastroenterol Nutri. 31 (supple S184). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tazawa Y, Kobayashi K, Ohura T, Abukawa D, Nishinomiya F, Hosoda Y, Yamashita M, Nagata I, Kono Y, Yasuda T, Yamaguchi N, Saeki T: "Infantile cholestatic jaundice associated with adult-onset type II citrullinemia."J Pediatr.. 138. 735-740 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, Okada S, Tazawa Y, Kanzaki S, Mura T, Ueta E, Nanba E, Ohtsuka Y: "Messenger RNA expression of antioxidant enzymes in the neonatal rat liver exposed to 1, 2, 3, 4 - TCDD via lactation."Environmental Sciences. 8. 128-129 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, Tazawa Y: "Familial nonhemolytic Jaundice"Syusanki Igaku. 31. 669-673 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, Okada S, Tazawa Y, Kanzaki S, Mura T, Ueta E, Nanba E, Ohtsuka Y: "The effect of lactational exposure to 1, 2, 3, 4 - tetrachlorodibenzo-p-dioxin on cytochrome P-450 1A1 mRNA in the neonatal rat liver, quantitative analysis by the competitive RT-PCR method."Pediatri Int. 43. 458-464 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono Y, Okada S, Tazawa Y, Kanzaki S, Mura T, Ueta E, Nanba E, Ohtsuka Y: "Messenger RNA expression of antioxidant enzymes in the neonatal rat liver exposed to 1, 2, 3,,4 - TCDD via lactation."Pediatri Int. 44. 481-487 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kono, Y, et al.: "Messenger RNA expression of antioxidant enzymes in the neonatal rat liver exposed to 1.2.3.4-TCDD via lactation"Pediatri Int. 44. 481-487 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yumi Kono, et al: "The effect of lactational exposure to 1,2,3,4- tetrachlorodibenzo-p-dioxin on cytochrome P-450 1A1 mRNA in the neonatal rat liver, quantitative analysis by the competitive RT-PCR method"Pediatrics International. 43・5. 458-464 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yusaku Tazawa, et al: "Infantile cholestatic jaundice associated with adult-onset type II citrullinemia"Journal of Pediatrics. 138・5. 735-740 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yumi Kono, et al: "Messenger RNA expression of antioxidant enzymes in the neonatal rat liver exposed to 1,2,3,4-TCDD via lactation"Environmental Sciences. 8・2&3. 128-129 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 河野 由美: "肝臓の疾患-体質性黄疸"周産期医学. 31・5. 669-673 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yumi Kono, et al: "Messenger RNA expression of antioxidant enzymes in the neonatal rat liver exposed to 1,2,3,4,-TCDD via lactation"Environmental Sciences. 8,2/3(発表予定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yumi Kono, et al: "Effects of 1,2,3,4,-TCDD on the mRNA expression of cytochromes P450 isoenzymes in the neonatal rat liver via lactation."Journal of Pediatric Gastroenterology and Nutrition. 31,supl 2. S184 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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