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Serologic evaluation of human microcystin exposure.

E D Hilborn1, W W Carmichael, R M Soares

  • 1United States Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Research Triangle Park, North Carolina, USA.

Environmental Toxicology
|August 19, 2007
PubMed
Summary

Microcystins, potent cyanobacteria toxins, were detected in human serum after kidney dialysis exposure. These toxins exist in both free and protein-bound forms, with free forms representing a variable portion of total microcystins.

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Area of Science:

  • Environmental Toxicology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Cyanobacteria blooms release microcystins, a common global toxin.
  • Intravenous exposure incidents in dialysis patients highlighted human exposure risks.
  • Microcystins can exist as free and protein-bound forms in human serum.

Purpose of the Study:

  • To biochemically characterize human microcystin exposure.
  • To identify uncertainties in interpreting microcystin exposure data.
  • To define research needs for understanding microcystin toxicokinetics.

Main Methods:

  • Serum samples analyzed using enzyme-linked immunosorbent assay (ELISA) for free microcystins.
  • Gas chromatography/mass spectrometry (GC/MS) used to detect 2-methyl-3-methoxy-4-phenylbutyric acid (MMPB), a marker for total microcystins.
  • MMPB quantification reflects both free and protein-bound microcystins after chemical oxidation.

Main Results:

  • Free microcystins were detected in patient serum for over 50 days post-exposure.
  • ELISA detected free microcystins as only 8-51% of total microcystin concentrations measured by GC/MS.
  • Evidence suggests microcystins circulate in both free and protein-bound forms in human serum.

Conclusions:

  • Human serum contains microcystins in both free and protein-bound states following intravenous exposure.
  • Free microcystins constitute a small, variable fraction of total serum microcystins.
  • Further research is crucial to understand microcystin toxicokinetics and exposure assessment.