Prevention of chemical carcinogen DNA binding and inhibition of nuclear RNA polymerase activity by organosulfur compounds as the possible mechanisms for their anticancer initiation and proliferation effects

Fu Li Yu, Wanda Bender, Qingming Fang, Anna Ludeke, Brianna Welch

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

This report examines the transcriptional roles and DNA binding properties of the three major organosulfur compounds (OSCs) from garlic, diallyl sulfide (DAS), diallyl disulfide (DADS) and diallyl trisulfide (DATS). We found DADS and DATS, but not DAS, could be activated by the versatile epoxide-forming oxidant dimethyldioxirane (DMDO) and could strongly inhibit nuclear RNA synthesis in vitro. We also found that when incubated together with [ 3H]-labeled 17β-estradiol (E2) for activation by DMDO, DADS and DATS, but not DAS, were able to prevent the binding of [ 3H]E2 to DNA. This preventive effect of DADS and DATS was confirmed when liver microsomes were used, and further verified by 32P post-labeling analysis. Additionally, we discovered that the DMDO treated DADS and DATS, but not DAS, were able to directly inhibit the enzyme RNA polymerase per se. These novel findings provide new insights into the potential mechanisms of the preventive effects of OSCs on tumor initiation and promotion.

Original languageEnglish (US)
Pages (from-to)370-379
Number of pages10
JournalCancer detection and prevention
Volume27
Issue number5
DOIs
StatePublished - 2003
Externally publishedYes

Keywords

  • 17β-Estradiol
  • DNA adducts
  • Diallyl disulfide
  • Diallyl sulfide
  • Diallyl trisulfide
  • RNA synthesis

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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