Synthesis and biological activity of DNA damaging agents that form decoy binding sites for the estrogen receptor

Stacia M. Rink, Kevin J Yarema, Marjorie S. Solomon, Lisa A. Paige, B. Mitra Tadayoni-Rebek, John M. Essigmann, Robert G. Croy

Research output: Contribution to journalArticle

Abstract

It is a goal of cancer chemotherapy to achieve the selective killing of tumor cells while minimizing toxicity to normal tissues. We describe the design of selective toxins forming DNA adducts that attract the estrogen receptor (ER), a transcription factor that is overexpressed in many human breast and ovarian tumors. The compounds consist of 4-(3-aminopropyl)-N,N- (2-chloroethyl)-aniline linked to 2-(4'-hydroxyphenyl)-3-methyl-5-hydroxy- indole. The former moiety is a DNA damaging nitrogen mustard and the latter is a ligand for the ER. The connection between these groups was refined to permit DNA adducts formed by the mustard portion of the molecule to present the ligand domain so that it was able to interact efficiently with the ER. By using 16-mers containing specific DNA adducts, it was determined that monoadducts and putative intrastrand crosslinks were preferred targets for the ER over interstrand crosslinks. A series of structurally related 2- phenylindole mustards was prepared, some of which were selectively toxic to the ER-positive breast cancer cell line MCF-7, as compared with the ER(-) negative line MDA-MB231. The ability both to bind to DNA and to interact significantly with the ER were essential to achieve selective lethality toward ER(+) cells. Compounds forming DNA adducts without the ability to bind receptor showed similar toxicities in the two cell lines. Several models could explain the selective toxicity of the mustard-phenylindole compounds toward ER(+) cells. The favored model suggests that a mustard-DNA adduct is shielded by the ER from DNA repair enzymes and hence cells possessing an abundance of the ER selectively retain the adduct and are killed.

Original languageEnglish (US)
Pages (from-to)15063-15068
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume93
Issue number26
DOIs
StatePublished - Dec 24 1996
Externally publishedYes

Fingerprint

Estrogen Receptors
Binding Sites
DNA
DNA Adducts
Mustard Plant
Mustard Compounds
Breast Neoplasms
DNA Repair Enzymes
Ligands
Cell Line
Mechlorethamine
Poisons
Neoplasms
Transcription Factors
Drug Therapy

Keywords

  • breast cancer
  • DNA repair
  • molecular recognition

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

Synthesis and biological activity of DNA damaging agents that form decoy binding sites for the estrogen receptor. / Rink, Stacia M.; Yarema, Kevin J; Solomon, Marjorie S.; Paige, Lisa A.; Tadayoni-Rebek, B. Mitra; Essigmann, John M.; Croy, Robert G.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 93, No. 26, 24.12.1996, p. 15063-15068.

Research output: Contribution to journalArticle

Rink, Stacia M. ; Yarema, Kevin J ; Solomon, Marjorie S. ; Paige, Lisa A. ; Tadayoni-Rebek, B. Mitra ; Essigmann, John M. ; Croy, Robert G. / Synthesis and biological activity of DNA damaging agents that form decoy binding sites for the estrogen receptor. In: Proceedings of the National Academy of Sciences of the United States of America. 1996 ; Vol. 93, No. 26. pp. 15063-15068.
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