Article Text

PDF
Association of blood lead and homocysteine levels among lead exposed subjects in Vietnam and Singapore
  1. Sin Eng Chia1,2,
  2. Safiyya Mohamed Ali2,
  3. Bee Lan Lee1,
  4. Gek Hsiang Lim2,
  5. Su Jin1,
  6. Nguyen-Viet Dong3,
  7. Nguyen Thi Hong Tu4,
  8. Choon Nam Ong,
  9. Kee Seng Chia2
  1. 1
    Department of Community, Occupational and Family Medicine, National University of Singapore, Republic of Singapore
  2. 2
    Centre for Molecular Epidemiology, National University of Singapore, Republic of Singapore
  3. 3
    Centre of Occupational Health and Environment, Ministry of Industry, Vietnam
  4. 4
    General Department of Preventive Medicine and HIV/AIDS Control, Ministry of Health, Vietnam
  1. Professor S E Chia, Department of Community, Occupational and Family Medicine (MD3), Faculty of Medicine, National University of Singapore, 16, Medical Drive, Singapore 117597, Republic of Singapore; cofcse{at}nus.edu.sg

Abstract

Objectives: Lead and homocysteine are both linked to cardiovascular disease. With this in mind, the authors evaluated the relation between blood lead and homocysteine in people aged 19–66 years in two Asian populations.

Methods: This cross-sectional study comprised 183 workers from a lead stabiliser factory in Singapore and 323 workers from a battery factory in Vietnam. Workers were occupationally exposed to lead. Blood lead was analysed using atomic absorption spectrophotometry while plasma homocysteine was measured using high performance liquid chromatography.

Results: Chinese subjects had the lowest blood lead levels while the Indians had the highest. Controlling for age, sex and race, an increase of 1 μg/dl in blood lead was associated with an increase of 0.04 μmol/l of homocysteine on the log scale. Gender and ethnicity seemed to be strongly associated with the relation between lead and homocysteine. The positive relation between lead and homocysteine among the Vietnamese subjects was significant (Pearson’s r = 0.254, p<0.01). When blood lead levels were divided by quartiles, the correlation coefficient between blood lead levels in the 4th quartile and homocysteine among the Vietnamese was higher (r = 0.405, p<0.01). Overall, an increase of 1 μg/dl in blood lead in all the Vietnamese subjects was associated with an increase of 0.05 μmol/l increase in homocysteine on the log scale. However, in the 4th quartile, the same increase was associated with an increase of 0.41 μmol/l of homocysteine on the log scale.

Conclusions: Blood lead was found to be associated with homocysteine levels in this Asian sample. Although we cannot determine causality from cross-sectional data, it is sensible to consider the probability that this relation could explain one of the mechanisms of the impact of lead on the cardiovascular system. More studies would be needed to confirm this inference.

Statistics from Altmetric.com

Footnotes

  • Funding: This project was made possible through the funding of Office of Life Sciences, National University of Singapore grant no: WBS R329-000-008-712.

  • Competing interests: None.

  • The study was approved by the National University Singapore Intuitional Review Board. Informed consent was obtained from each worker before the commencement of the study.

  • Abbreviations:
    HPLC
    high performance liquid chromatography

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.