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Subclinical effects of environmental hazardous factors on nervous and renal functions in humans

Research Project

Project/Area Number 17590507
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MURATA Katsuyuki  Akita University, School of Medicine, Professor, 医学部, 教授 (80157776)

Co-Investigator(Kenkyū-buntansha) ISHII Noriko  Akita University, School of Medicine, Professor, 医学部, 教授 (10222944)
NAKAI Kunihiko  Tohoku University, Graduate School of Medicine, Associate Professor, 大学院・医学系研究科, 助教授 (00291336)
KARITA Kanae  Teikyo University, School of Medicine, Lecturer, 医学部, 講師 (40224711)
IWATA Toyoto  Akita University, School of Medicine, Instructor, 医学部, 助手 (00321894)
DAKEISHI Miwako  Akita University, School of Medicine, Instructor, 医学部, 助手 (70375236)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥2,900,000 (Direct Cost: ¥2,900,000)
KeywordsEnvironmental hazardous factors / Neuroscience / Preventive medicine / Critical concentration / Risk assessment / 鉛 / カドミウム / 水銀 / 身体重心動揺 / 非顕性影響
Research Abstract

The objectives of this research were to clarify the subclinical effects of environmental hazardous factors such as lead, cadmium, and methylmercury (MeHg), on nervous and renal functions in humans. (1) The first study was carried out to estimate the critical dose of lead affecting the neuromotor function in workers by introducing the benchmark dose (BMD) approach. Postural sway parameters with spectral analysis were compared between 121 lead workers with BPb levels of 6-89 μg/dl and 60 unexposed controls. All sway parameters, except for sagittal sways with eyes open, were significantly larger in the lead workers than in the controls. The critical dose of BPb was estimated to be 12.1-17.3 μg/dl for postural sway. (2) To investigate the relations among total mercury (THg) levels in hair, toenail, and urine, together with potential effects of MeHg intake on renal tubular function, their levels, and urinary N-acetyl-glucosaminidase activity (NAG) and α1-microglobulin (AMG) were determined … More in 59 women, and estimated daily mercury intakes from fish and other seafood using a food frequency questionnaire. THg levels in the women were 1.51±0.91 (SD) μg/g in hair, 0.59±0.32 μg/g in toenail, and 0.86±0.66 μg/g creatinine (Cre) in urine ; and, there were positive correlations among them. The daily mercury intake of 9.15±7.84 μg/day was significantly correlated with THg levels in hair, toenail, and urine. Among the women, the NAG and AMG were positively correlated with both the daily mercury intake and THg levels in hair, toenail, and urine ; and, these relations were almost similar when using multiple regression analysis to adjust for possible confounders such as urinary cadmium (0.47±0.28 μg/g Cre). In conclusion, MeHg resulting from fish consumption can explain total mercury levels in hair, toenail, and urine to some degree, partly through the degradation into the inorganic form. (3) To clarify the neuromotor effects of occupational exposure to mercury vapor, hand tremor and postural sway were measured in 27 miners and smelters and 52 unexposed subjects. The means of the urinary mercury level (UHg) were 228 μg/g Cre for the exposed workers and 2.6 μg/g Cre for the unexposed subjects. Total tremor intensity and frequency-specific tremor intensities at 1-6 and 10-14 Hz were significantly larger in the exposed workers than in the unexposed subjects, but they were not significantly related to the UHg among the exposed workers. In contrast, there were no significant differences in any postural sway parameters between the above two group, but the transversal sway with eyes open was positively related to the UHg among the exposed workers in using multiple regression analysis. These findings suggest that postural sway and hand tremor, may be affected by elemental mercury vapor exposure. Less

Report

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

    (16 results)

All 2007 2006 2005

All Journal Article (16 results)

  • [Journal Article] Total mercury levels in hair, toenail, and urine among women free from occupational exposure and their relations to renal tubular function2007

    • Author(s)
      Tomoko Ohno et al.
    • Journal Title

      Environmental Research 103

      Pages: 191-197

    • 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
  • [Journal Article] Effects of mercury vapor exposure on neuromotor function in Chinese miners and smelters2007

    • Author(s)
      Toyoto Iwata et al.
    • Journal Title

      Int Arch Occup Environ Health 80

      Pages: 381-387

    • 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
  • [Journal Article] Effects of mercury vapor exposure on nuromotor function in Chinese miners and smelters2007

    • Author(s)
      Toyoto Iwata et al.
    • Journal Title

      Int Arch Occup Environ Health 80

      Pages: 381-387

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Spontaneous awakening from nocturnal sleep and cardiac autonomic function in preschool children2007

    • Author(s)
      Mari Sampei et al.
    • Journal Title

      Autonomic Neuroscience 133

      Pages: 170-174

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Long-term consequences of arsenic poisoning during infancy due to contaminated milk powder2006

    • Author(s)
      Miwako Dakeishi et al.
    • Journal Title

      Environmental Health 5

      Pages: 31-31

    • 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
  • [Journal Article] Cardiac autonomic hypofunction in presechool children with short nocturnal sleep2006

    • Author(s)
      Mari Sampei et al.
    • Journal Title

      Tohoku J Exp Med 208

      Pages: 235-242

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Cardiac autonomic hypofunction in preschool children with short nocturnal sleep2006

    • Author(s)
      Mari Sampei et al.
    • Journal Title

      Tohoku J Exp Med 208

      Pages: 235-242

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Impact of total sleep duration on blood pressure in preschool children2006

    • Author(s)
      Mari Sampei et al.
    • Journal Title

      Biomedical Research 27

      Pages: 111-115

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Subclinical effects of prenatal methylmercury exposure on cardiac autonomic function in Japanese children.2006

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

      International Archives of Occupational and Environmental Health 79

      Pages: 379-386

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Relation between benchmark dose and no-observed-adverse-effect level in clinical research : effects of daily alcohol intake on blood 〜2006

    • Author(s)
      Dakeishi M, Murata K, et al.
    • Journal Title

      Risk Analysis 26

      Pages: 115-124

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Benchmark dose of lead inducing anemia at the workplace2005

    • Author(s)
      Kanae Karita et al.
    • Journal Title

      Risk Analysis 25

      Pages: 957-962

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Critical dose of lead affecting postural balance in workers2005

    • Author(s)
      Toyoto Iwata et al.
    • Journal Title

      American Journal of Industrial Medicine 48

      Pages: 319-325

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of hair treatment on hair mercury - the best biomarker of methylmercury exposure.2005

    • Author(s)
      Dakeishi M, Murata K, et al.
    • Journal Title

      Environmental Health and Preventive Medicine 10

      Pages: 208-212

    • NAID

      10016602436

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Cardiac autonomic imbalance in female nurses with shift work.2005

    • Author(s)
      Ishii N, Murata K, et al.
    • Journal Title

      Autonomic Neuroscience : Basic and Clinical 122

      Pages: 94-99

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Benchmark dose of lead inducing anemia at the workplace.2005

    • Author(s)
      Karita K, Murata K, et al.
    • Journal Title

      Risk Analysis 25

      Pages: 957-962

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Critical dose of lead affecting postural balance in workers.2005

    • Author(s)
      Iwata T, Murata K, et al.
    • Journal Title

      American Journal of Industrial Medicine 48

      Pages: 319-325

    • Related Report
      2005 Annual Research Report

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

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