Archives of Toxicology

, Volume 80, Issue 12, pp 811–816 | Cite as

Clinical evidence for lead-induced inhibition of nitric oxide formation

  • Fernando BarbosaJr
  • Jonas T. C. Sertorio
  • Raquel F. Gerlach
  • Jose E. Tanus-Santos
Inorganic Compounds

Abstract

Lead exposure has been associated with increased cardiovascular risk, which may result, at least in part, from lead-induced increases in oxidative stress and depressed nitric oxide (NO) availability. However, no previous clinical study has examined whether lead exposure is associated with significant effects on biomarkers of NO activity (plasma nitrites, nitrates, and cyclic guanosine 3′,5′-monophosphate; cGMP). We investigated whether there is an association between the circulating concentrations of nitrites, nitrates, and cGMP and the concentrations of lead in whole blood (B-Pb) or plasma (P-Pb) from 62 lead-exposed subjects (30 men and 32 women). P-Pb was determined by inductively coupled plasma mass spectrometry and B-Pb by graphite furnace atomic absorption spectrometry. Plasma nitrite and nitrate concentrations were measured using an ozone-based chemiluminescence assay. Plasma cGMP concentrations were measured using a commercial enzyme immunoassay. We found a negative correlation between plasma nitrite and B-Pb concentrations (= −0.358; = 0.004), and between plasma nitrite and P-Pb concentrations (= −0.264; = 0.038), thus suggesting increased inhibition of NO formation with increasing B-Pb or P-Pb concentrations. However, no significant correlations were found between plasma nitrate or cGMP and B-Pb or P-Pb concentrations (all > 0.05). These findings suggest a significant inhibitory effect of lead exposure on NO formation and provide clinical evidence for a biological mechanism possibly involved the association between lead exposure and increased cardiovascular risk.

Keywords

Cyclic GMP Lead toxicology Nitric oxide Nitrates Nitrites Plasma lead Whole blood lead 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Fernando BarbosaJr
    • 1
  • Jonas T. C. Sertorio
    • 2
  • Raquel F. Gerlach
    • 3
  • Jose E. Tanus-Santos
    • 2
  1. 1.Department of Clinical, Toxicological and Food Science AnalysisFaculty of Pharmaceutical Sciences of Ribeirao PretoRibeirao PretoBrazil
  2. 2.Department of Pharmacology, Faculty of Medicine of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil
  3. 3.Department of Morphology, Estomatology and Physiology, Dental School of Ribeirao PretoUniversity of Sao Paulo Ribeirao PretoBrazil

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