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Related Experiment Videos

4-Hydroxytamoxifen sulfation metabolism.

Guangping Chen1, Shuhua Yin, Smarajit Maiti

  • 1Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA. cguang@okstate.edu

Journal of Biochemical and Molecular Toxicology
|December 14, 2002
PubMed
Summary

Tamoxifen (TAM) metabolism differs between species. While alpha-hydroxytamoxifen (alpha-OH-TAM) sulfation may activate TAM, 4-hydroxytamoxifen (4-OH-TAM) sulfation appears to detoxify it, explaining species-specific toxicity.

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Area of Science:

  • Pharmacology
  • Toxicology
  • Biochemistry

Background:

  • Tamoxifen (TAM) is a crucial breast cancer therapeutic and preventative agent.
  • Concerns exist regarding TAM's association with endometrial cancer and its hepatocarcinogenicity in rats.
  • Oxidative metabolites like alpha-hydroxytamoxifen (alpha-OH-TAM) and 4-hydroxytamoxifen (4-OH-TAM) are key to TAM's effects.

Purpose of the Study:

  • To investigate the limited studies on the sulfation of TAM metabolites.
  • To compare the sulfation of 4-OH-TAM in human and rat liver and intestinal cytosols.
  • To elucidate the roles of sulfation pathways in TAM bioactivation and detoxification.

Main Methods:

  • Investigated sulfation activity of human and rat liver and intestinal cytosols towards 4-OH-TAM.

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  • Identified key enzymes involved in human 4-OH-TAM sulfation, including phenol-sulfating sulfotransferase, estrogen sulfotransferase, and dopamine-sulfating sulfotransferase.
  • Assessed sulfation activity using biochemical assays.

    • Main Results:

    • Human liver and intestinal cytosols exhibit significant sulfation activity for 4-OH-TAM.
    • Human phenol-sulfating sulfotransferase, estrogen sulfotransferase, and dopamine-sulfating sulfotransferase catalyze 4-OH-TAM sulfation.
    • Rat liver and intestinal cytosols showed no detectable sulfation activity for 4-OH-TAM.
    • Alpha-OH-TAM is a substrate for rat hydroxysteroid sulfotransferase a (STa).

    Conclusions:

    • The sulfation of alpha-OH-TAM may lead to TAM bioactivation.
    • The sulfation of 4-OH-TAM appears to be a detoxification pathway in humans.
    • Differential sulfation pathways explain the higher toxicity of TAM observed in rats compared to humans.