Radiosensitization of human and rodent cell lines by INO-1001, a novel inhibitor of poly(ADP-ribose) polymerase

William A. Brock, Luka Milas, Sherry Bergh, Ruth Lo, Csaba Szabo, Kathy A. Mason

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Inhibition of poly(ADP-ribose) polymerase (PARP) by a novel, potent inhibitor, INO-1001, was examined in two rodent and one human fibroblast cell lines, after single and fractionated radiation treatments. Since PARP plays a role in the early events following DNA damage and influences the effectiveness of DNA repair, its inhibition has been proposed to constitute a drug target for the development of novel radiosensitizers. We found that INO-1001 effectively inhibited PARP activity at non-cytotoxic concentrations. Combination treatment of 10 μM INO-1001 and a single dose of radiation resulted in significant radiosensitization of all three cells lines (enhancement ratios 1.4-1.6). This radioenhancement was even greater when the drug and radiation were given as fractionated treatments (enhancement ratio 8.0). Apoptosis (as evaluated by TUNEL staining) was not enhanced by the treatments, suggesting that inhibiting PARP enzyme activity by INO-1001 enhanced radiation-induced cell killing by interfering with DNA repair mechanisms, resulting in necrotic cell death. INO-1001 therefore, appears to have potential as a potent enhancer of radiation sensitivity, without any intrinsic cytotoxicity from the drug alone.

Original languageEnglish (US)
Pages (from-to)155-160
Number of pages6
JournalCancer Letters
Volume205
Issue number2
DOIs
StatePublished - Mar 18 2004
Externally publishedYes

Fingerprint

Poly(ADP-ribose) Polymerases
Rodentia
Cell Line
Radiation
DNA Repair
Pharmaceutical Preparations
Radiation Tolerance
In Situ Nick-End Labeling
DNA Damage
Cell Death
Fibroblasts
Poly(ADP-ribose) Polymerase Inhibitors
INO 1001
Apoptosis
Staining and Labeling
Enzymes

Keywords

  • Fibroblasts
  • Poly(ADP-ribose) polymerase
  • Poly(ADP-ribose) synthetase
  • Radiation
  • Radiosensitizer
  • Tumor cells

ASJC Scopus subject areas

  • Cancer Research
  • Molecular Biology
  • Oncology

Cite this

Radiosensitization of human and rodent cell lines by INO-1001, a novel inhibitor of poly(ADP-ribose) polymerase. / Brock, William A.; Milas, Luka; Bergh, Sherry; Lo, Ruth; Szabo, Csaba; Mason, Kathy A.

In: Cancer Letters, Vol. 205, No. 2, 18.03.2004, p. 155-160.

Research output: Contribution to journalArticle

Brock, William A. ; Milas, Luka ; Bergh, Sherry ; Lo, Ruth ; Szabo, Csaba ; Mason, Kathy A. / Radiosensitization of human and rodent cell lines by INO-1001, a novel inhibitor of poly(ADP-ribose) polymerase. In: Cancer Letters. 2004 ; Vol. 205, No. 2. pp. 155-160.
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