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Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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DNA adducts formed by a novel antitumor agent 11beta-dichloro in vitro and in vivo

Shawn M Hillier1, John C Marquis, Beatriz Zayas

  • 1Department of Chemistry and Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Molecular Cancer Therapeutics
|May 2, 2006
PubMed

Insights

The novel molecule 11beta-dichloro forms DNA adducts that bind the androgen receptor, potentially inhibiting tumor growth by blocking DNA repair and gene expression. This compound shows stability and tissue distribution in vivo.

Area of Science:

  • Molecular Pharmacology
  • Cancer Biology
  • Drug Development

Background:

  • The androgen receptor (AR) plays a crucial role in the growth and survival of various cancers, particularly prostate cancer.
  • Targeting the AR is a key strategy in cancer therapy, but resistance mechanisms often emerge.
  • Novel therapeutic agents are needed to overcome existing treatment limitations.

Purpose of the Study:

  • To investigate the formation and function of DNA adducts created by the novel molecule 11beta-dichloro.
  • To determine the in vivo distribution and stability of 11beta-dichloro.
  • To explore the potential antitumor mechanisms of 11beta-dichloro through its interaction with the androgen receptor and DNA.

Main Methods:

  • Synthesis and characterization of 11beta-dichloro, a molecule combining an AR ligand with a bifunctional alkylating agent.
  • In vitro studies to assess DNA adduct formation and AR binding.
  • In vivo studies using [14C]-labeled 11beta-dichloro in mouse models with tumor xenografts.
  • Quantification of DNA adducts in various tissues using accelerator mass spectrometry (AMS).

Main Results:

  • 11beta-dichloro is stable in circulation and widely distributed in mouse tissues after intraperitoneal injection.
  • Covalent 11beta-guanine adducts were detected in DNA from cells in culture and from liver and tumor tissues of treated mice.
  • The levels of DNA adducts in tumor tissue were comparable to those in cultured cells treated with 11beta-dichloro.
  • The formed DNA adducts are capable of binding the androgen receptor in target tissues in vivo.

Conclusions:

  • 11beta-dichloro demonstrates sufficient stability for systemic administration and tissue penetration.
  • The formation of AR-binding DNA adducts in vivo suggests a novel mechanism for antitumor activity.
  • These findings support the potential of 11beta-dichloro as a therapeutic agent targeting AR-dependent cancers through unique molecular interactions.

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