Dual role of poly(ADP-ribose) glycohydrolase in the regulation of cell death in oxidatively stressed A549 cells

Katalin Erdélyi, Péter Bai, István Kovács, Éva Szabó, Gábor Mocsár, Annamária Kakuk, Csaba Szabo, Pál Gergely, László Virág

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Abstract

Activation of poly(ADP-ribose) polymerase-1 (PARP1) has been shown to mediate cell death induced by genotoxic stimuli. The role of poly(ADPribose) glycohydrolase (PARG), the enzyme responsible for polymer degradation, has been largely unexplored in the regulation of cell death. Using lentiviral gene silencing we generated A549 lung adenocarcinoma cell lines with stably suppressed PARG and PARP1 expression (shPARG and shPARP1 cell lines, respectively) and determined parameters of apoptotic and necrotic cell death following hydrogen peroxide exposure. shPARG cells accumulated large amounts of poly-(ADP-ribosyl)ated proteins and exhibited reduced PARP activation. Hydrogen peroxide-induced cell death is regulated by PARG in a dual fashion. Whereas the shPARG cell line (similarly to shPARP1 cells) was resistant to the necrotic effect of high concentrations of hydrogen peroxide, these cells exhibited stronger apoptotic response. Both shPARP1 and especially shPARG cells displayed a delayed repair of DNA breaks and exhibited reduced clonogenic survival following hydrogen peroxide treatment. Translocation of apoptosis-inducing factor could not be observed, but cells could be saved by methyl pyruvate and α-ketoglutarate, indicating that energy failure may mediate cytotoxicity in our model. These data indicate that PARG is a survival factor at mild oxidative damage but contributes to the apoptosis-necrosis switch in severely damaged cells.

Original languageEnglish (US)
Pages (from-to)3553-3563
Number of pages11
JournalFASEB Journal
Volume23
Issue number10
DOIs
StatePublished - Oct 2009

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Cell death
Hydrogen Peroxide
Cell Death
Poly(ADP-ribose) Polymerases
Cells
Chemical activation
Apoptosis Inducing Factor
Cell Line
Cytotoxicity
Polymers
DNA Breaks
Repair
Genes
Switches
Gene Silencing
Apoptosis
Degradation
poly ADP-ribose glycohydrolase
A549 Cells
DNA

Keywords

  • Apoptosis
  • Apoptosis-inducing factor
  • DNA damage
  • Gene silencing
  • Hydrogen peroxide
  • Necrosis

ASJC Scopus subject areas

  • Biochemistry
  • Biotechnology
  • Genetics
  • Molecular Biology

Cite this

Erdélyi, K., Bai, P., Kovács, I., Szabó, É., Mocsár, G., Kakuk, A., ... Virág, L. (2009). Dual role of poly(ADP-ribose) glycohydrolase in the regulation of cell death in oxidatively stressed A549 cells. FASEB Journal, 23(10), 3553-3563. https://doi.org/10.1096/fj.09-133264

Dual role of poly(ADP-ribose) glycohydrolase in the regulation of cell death in oxidatively stressed A549 cells. / Erdélyi, Katalin; Bai, Péter; Kovács, István; Szabó, Éva; Mocsár, Gábor; Kakuk, Annamária; Szabo, Csaba; Gergely, Pál; Virág, László.

In: FASEB Journal, Vol. 23, No. 10, 10.2009, p. 3553-3563.

Research output: Contribution to journalArticle

Erdélyi, K, Bai, P, Kovács, I, Szabó, É, Mocsár, G, Kakuk, A, Szabo, C, Gergely, P & Virág, L 2009, 'Dual role of poly(ADP-ribose) glycohydrolase in the regulation of cell death in oxidatively stressed A549 cells', FASEB Journal, vol. 23, no. 10, pp. 3553-3563. https://doi.org/10.1096/fj.09-133264
Erdélyi, Katalin ; Bai, Péter ; Kovács, István ; Szabó, Éva ; Mocsár, Gábor ; Kakuk, Annamária ; Szabo, Csaba ; Gergely, Pál ; Virág, László. / Dual role of poly(ADP-ribose) glycohydrolase in the regulation of cell death in oxidatively stressed A549 cells. In: FASEB Journal. 2009 ; Vol. 23, No. 10. pp. 3553-3563.
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