Inhibition of repair of radiation-induced DNA damage enhances gene expression from replication-defective adenoviral vectors

Mohan Hingorani, Christine L. White, Andrew Merron, Inge Peerlinck, Martin E. Gore, Andrew Slade, Simon D. Scott, Christopher M. Nutting, Hardev S. Pandha, Alan A. Melcher, Richard Geoffrey Vile, Georges Vassaux, Kevin J. Harrington

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Abstract

Radiation has been shown to up-regulate gene expression from adenoviral vectors in previous studies. In the current study, we show that radiation-induced dsDNA breaks and subsequent signaling through the mitogen-activated protein kinase (MAPK) pathway are responsible, at least in part, for this enhancement of transgene expression both in vitro and in vivo. Inhibitors of ataxia-telangiectasia-mutated, poly(ADP-ribose) polymerase-mutated, and DNA-dependent protein kinase (DNA-PK)-mediated DNA repair were shown to maintain dsDNA breaks (γH2AX foci) by fluorescence-activated cell sorting and microscopy. Inhibition of DNA repair was associated with increased green fluorescent protein (GFP) expression from a replication-defective adenoviral vector (Ad-CMV-GFP). Radiation-induced up-regulation of gene expression was abrogated by inhibitors of MAPK (PD980059 and U0126) and phosphatidylinositol 3-kinase (LY294002) but not by p38 MAPK inhibition. A reporter plasmid assay in which GFP was under the transcriptional control of artificial Egr-1 or cytomegalovirus promoters showed that the DNA repair inhibitors increased GFP expression only in the context of the Egr-1 promoter. In vivo administration of a water-soluble DNA-PK inhibitor (KU0060648) was shown to maintain luciferase expression in HCT116 xenografts after intratumoral delivery of Ad-RSV-Luc. These data have important implications for therapeutic strategies involving multimodality use of radiation, targeted drugs, and adenoviral gene delivery and provide a framework for evaluating potential advantageous combinatorial effects.

Original languageEnglish (US)
Pages (from-to)9771-9778
Number of pages8
JournalCancer Research
Volume68
Issue number23
DOIs
StatePublished - Dec 1 2008

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Green Fluorescent Proteins
DNA Damage
DNA-Activated Protein Kinase
DNA Repair
Radiation
Gene Expression
Mitogen-Activated Protein Kinases
Up-Regulation
Phosphatidylinositol 3-Kinase
Ataxia Telangiectasia
2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one
Poly(ADP-ribose) Polymerases
Gene Expression Regulation
p38 Mitogen-Activated Protein Kinases
Protein Kinase Inhibitors
Luciferases
Cytomegalovirus
Transgenes
Heterografts
Microscopy

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Hingorani, M., White, C. L., Merron, A., Peerlinck, I., Gore, M. E., Slade, A., ... Harrington, K. J. (2008). Inhibition of repair of radiation-induced DNA damage enhances gene expression from replication-defective adenoviral vectors. Cancer Research, 68(23), 9771-9778. https://doi.org/10.1158/0008-5472.CAN-08-1911

Inhibition of repair of radiation-induced DNA damage enhances gene expression from replication-defective adenoviral vectors. / Hingorani, Mohan; White, Christine L.; Merron, Andrew; Peerlinck, Inge; Gore, Martin E.; Slade, Andrew; Scott, Simon D.; Nutting, Christopher M.; Pandha, Hardev S.; Melcher, Alan A.; Vile, Richard Geoffrey; Vassaux, Georges; Harrington, Kevin J.

In: Cancer Research, Vol. 68, No. 23, 01.12.2008, p. 9771-9778.

Research output: Contribution to journalArticle

Hingorani, M, White, CL, Merron, A, Peerlinck, I, Gore, ME, Slade, A, Scott, SD, Nutting, CM, Pandha, HS, Melcher, AA, Vile, RG, Vassaux, G & Harrington, KJ 2008, 'Inhibition of repair of radiation-induced DNA damage enhances gene expression from replication-defective adenoviral vectors', Cancer Research, vol. 68, no. 23, pp. 9771-9778. https://doi.org/10.1158/0008-5472.CAN-08-1911
Hingorani, Mohan ; White, Christine L. ; Merron, Andrew ; Peerlinck, Inge ; Gore, Martin E. ; Slade, Andrew ; Scott, Simon D. ; Nutting, Christopher M. ; Pandha, Hardev S. ; Melcher, Alan A. ; Vile, Richard Geoffrey ; Vassaux, Georges ; Harrington, Kevin J. / Inhibition of repair of radiation-induced DNA damage enhances gene expression from replication-defective adenoviral vectors. In: Cancer Research. 2008 ; Vol. 68, No. 23. pp. 9771-9778.
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AU - Gore, Martin E.

AU - Slade, Andrew

AU - Scott, Simon D.

AU - Nutting, Christopher M.

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AU - Vile, Richard Geoffrey

AU - Vassaux, Georges

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