Archives of Toxicology

, Volume 83, Issue 10, pp 909–924

Subacute exposure to N-ethyl perfluorooctanesulfonamidoethanol results in the formation of perfluorooctanesulfonate and alters superoxide dismutase activity in female rats

  • Wei Xie
  • Qian Wu
  • Izabela Kania-Korwel
  • Job C. Tharappel
  • Sanjay Telu
  • Mitchell C. Coleman
  • Howard P. Glauert
  • Kurunthachalam Kannan
  • S. V. S.  Mariappan
  • Douglas R. Spitz
  • Jamie Weydert
  • Hans-Joachim Lehmler
Toxicokinetics and Metabolism

DOI: 10.1007/s00204-009-0450-y

Cite this article as:
Xie, W., Wu, Q., Kania-Korwel, I. et al. Arch Toxicol (2009) 83: 909. doi:10.1007/s00204-009-0450-y

Abstract

Perfluorooctanesulfonamides, such as N-ethyl perfluorooctanesulfonamidoethanol (N-EtFOSE), are large scale industrial chemicals but their disposition and toxicity are poorly understood despite significant human exposure. The hypothesis that subacute exposure to N-EtFOSE, a weak peroxisome proliferator, causes a redox imbalance in vivo was tested using the known peroxisome proliferator, ciprofibrate, as a positive control. Female Sprague–Dawley rats were treated orally with N-EtFOSE, ciprofibrate or corn oil (vehicle) for 21 days, and levels of N-EtFOSE and its metabolites as well as markers of peroxisome proliferation and oxidative stress were assessed in serum, liver and/or uterus. The N-EtFOSE metabolite profile in liver and serum was in good agreement with reported in vitro biotransformation pathways in rats and the metabolite levels decreasing in the order perfluorooctanesulfonate ≫ perfluorooctanesulfonamide ~ N-ethyl perfluorooctanesulfonamidoacetate ≫ perfluorooctanesulfonamidoethanol ~ N-EtFOSE. Although N-EtFOSE treatment significantly decreased the growth rate, increased relative liver weight and activity of superoxide dismutases (SOD) in liver and uterus (total SOD, CuZnSOD and MnSOD), a metabolic study revealed no differences in the metabolome in serum from N-EtFOSE-treated and control animals. Ciprofibrate treatment increased liver weight and peroxisomal acyl Co-A oxidase activity in the liver and altered antioxidant enzyme activities in the uterus and liver. According to NMR metabolomic studies, ciprofibrate treated animals had altered serum lipid profiles compared to N-EtFOSE-treated and control animals, whereas putative markers of peroxisome proliferation in serum were not affected. Overall, this study demonstrates the biotransformation of N-EtFOSE to PFOS in rats that is accompanied by N-EtFOSE-induced alterations in antioxidant enzyme activity.

Keywords

MetabolomicsPerfluorooctanesulfonamidesPerfluorooctanesulfonatePeroxisomal acyl Co-A oxidaseSuperoxide dismutase

Supplementary material

204_2009_450_MOESM1_ESM.docx (269 kb)
Supplementary material 1 (DOCX 268 kb)

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Wei Xie
    • 1
  • Qian Wu
    • 2
  • Izabela Kania-Korwel
    • 1
  • Job C. Tharappel
    • 3
  • Sanjay Telu
    • 1
  • Mitchell C. Coleman
    • 4
  • Howard P. Glauert
    • 3
    • 5
  • Kurunthachalam Kannan
    • 2
  • S. V. S.  Mariappan
    • 6
  • Douglas R. Spitz
    • 4
  • Jamie Weydert
    • 7
  • Hans-Joachim Lehmler
    • 1
  1. 1.Department of Occupational and Environmental Health, College of Public HealthThe University of IowaIowa CityUSA
  2. 2.Wadsworth Center, New York State Department of Health and Department of Environmental Health SciencesState University of New YorkAlbanyUSA
  3. 3.Graduate Center for Nutritional SciencesUniversity of KentuckyLexingtonUSA
  4. 4.Free Radical and Radiation Biology Program, Department of Radiation Oncology, Holden Comprehensive Cancer CenterThe University of IowaIowa CityUSA
  5. 5.Graduate Center for ToxicologyUniversity of KentuckyLexingtonUSA
  6. 6.Department of Chemistry, College of Liberal Arts and SciencesThe University of IowaIowa CityUSA
  7. 7.Department of Pathology, Carver College of MedicineThe University of IowaIowa CityUSA