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Estrogen metabolism by conjugation.

R Raftogianis1, C Creveling, R Weinshilboum

  • 1Department of Pharmacology, Fox Chase Cancer Center, Philadelphia, PA 19111, USA. RB_Raftogianis@FCCC.EDU

Journal of the National Cancer Institute. Monographs
|August 30, 2000
PubMed
Summary

Estrogens can cause cancer by damaging DNA, forming reactive molecules that lead to mutations. Detoxification pathways, influenced by genetic variations, help protect against estrogen-induced cancer.

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Area of Science:

  • Biochemistry
  • Molecular Genetics
  • Carcinogenesis

Background:

  • Estrogens are implicated in cancer development in hormone-sensitive tissues.
  • Traditionally, estrogen's mitogenic effects via estrogen receptors were the focus.
  • Emerging research suggests estrogens directly cause DNA damage and mutations.

Purpose of the Study:

  • To explore the mechanisms of estrogen-induced DNA damage and mutagenesis.
  • To discuss the biochemical pathways involved in estrogen metabolism and detoxification.
  • To examine the role of genetic polymorphisms in these detoxification pathways.

Main Methods:

  • Review of biochemical and molecular genetics literature on estrogen metabolism.
  • Analysis of the formation of reactive oxygen species and electrophilic molecules from catechol estrogens.

Related Experiment Videos

  • Investigation of conjugation reactions (sulfation, glucuronidation, methylation, glutathione conjugation) as detoxification mechanisms.

    • Main Results:

    • Catechol estrogens can be oxidized to semiquinones and quinones, forming depurinating DNA adducts.
    • Conjugation reactions detoxify estrogens and their reactive metabolites.
    • Interindividual variability in detoxification enzyme activity is linked to genetic polymorphisms.

    Conclusions:

    • Estrogens can be both mitogenic and mutagenic, contributing to cancer.
    • Detoxification pathways are crucial for mitigating estrogen-induced DNA damage.
    • Genetic variations in detoxification enzymes can influence cancer susceptibility.