Identification of the Herbicide Surflan and Its Active Ingredient Oryzalin, a Dinitrosulfonamide, as Xenoestrogens

  • L. C. HallEmail author
  • J. M. Rogers
  • M. S. Denison
  • M. L. Johnson


Numerous environmental contaminants have been identified as endocrine disruptors (EDs) — substances that alter endocrine homeostasis by interfering with the biological action, production, or pharmacokinetics of endogenous hormones. Xenoestrogens are those EDs whose biological activity is similar to endogenous estrogen. This report presents data that identified Surflan, a proprietary herbicide emulsion, and its active ingredient oryzalin as xenoestrogens. In vitro, Surflan and oryzalin activated an estrogen-inducible reporter gene, and oryzalin competitively displaced 17β-estradiol from the estrogen receptor. In vivo, Surflan and oryzalin induced expression of estrogen-regulated high-molecular-weight choriogenin genes in medaka (Oryzias latipes). These results are consistent with the characteristics of previously identified xenoestrogens and indicate that Surflan and oryzalin have the potential to adversely affect numerous estrogen-regulated biological processes.


Estrogenic Activity Striped Bass Mouse Mammalian Tumor Virus Oryzalin Competitive Displacement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • L. C. Hall
    • 1
    Email author
  • J. M. Rogers
    • 2
  • M. S. Denison
    • 3
  • M. L. Johnson
    • 3
  1. 1.Lawrence Livermore National Laboratory, L-396LivermoreUSA
  2. 2.Oregon State UniversityCorvallisUSA
  3. 3.University of California DavisDavisUSA

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