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1998 Fiscal Year Final Research Report Summary

Study of Biological-Effect Monitoring to Arsenic Exposure

Research Project

Project/Area Number 09670417
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Public health/Health science
Research InstitutionSt.Marianna University School of Medicine

Principal Investigator

YAMAUCHI Hiroshi  St.Marianna University School of Medicine, Department of Preventive Medicine, Associate Professor, 医学部, 助教授 (90081661)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Takahiko  Tokai University School of Medicine, Department of Environmental Health, Associa, 医学部, 助教授 (90200998)
Project Period (FY) 1997 – 1998
Keywordsarsenic / biological monitoring / exposure monitoring / effect monitoring / methylation / urinary porphrine / carcinogenesis / hyperkeratosis
Research Abstract

In recent years, arsenic contamination to drinking water is a cause, and a large-scale chronic arsenic poisoning occurs in China. Exposure doses of iAs were approximately 1 mg or more a day. The mean urinary total arsenic (iAs + metabolites) level in the 36 subjects was 2.39 = 0.67 mu As/L, composed of 15% iAs, 20% monomethylated arsenic (MA) and 65% dimethylated arsenic (DMA). The tendency for excretion of urinary MA and DMA keep pace with lAs, and increased was observed by the patients with chronic arsenic poisoning. The difference of sex difference was observed by 2nd methylation for iAs in vivo. The mean hair total arsenic level in the 29 subjects was 1.82 mug As/g, composed of 88% iAs and 12% DMA.As for DMA concentration in hair, the tendency which rose was shown to lAs exposure.
Histopathologically, significant alteration in epidermis was not observed in mice of the exposed groups. In contrast, dermis in the exposed animals showed moderately thick collagen bundles compared with control animals. Seven of 12 exposed animals showed significantly thickened collagen bundles in dermis. The mRNA expressions of GM-CSF and TGFalpha were enhanced moderately in the exposed animals compared with those of control animals. This result shows arsenic induces tight skin in mice and suggests that up-regulations of collagen production might responsible on the tightened skin in arsenic poisoning probably via induction of GM-CSF and TGFalpha.

  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] Loffredo. C.A, Yamauchi, H.et al .: "Variability in human susceptibility of arsenic" Science. (投稿中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yamauchi et al.: "metabolism and biological monitoring of arsenic poisoning following chronic arsenic exposure in Inner Mongolia, China" The Toxicologist. 42. 1998 (1581)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] C.A.Loffredo, H.Yamauchi et al.: "Variablity in Human Susceptibility to Arsenic" Science. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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