REAL

Poly(ADP-ribose) polymerase-2 depletion reduces doxorubicin-induced damage through SIRT1 induction

Szántó, Magdolna and Rutkai, Ibolya and Hegedűs, Csaba and Czikora, Ágnes and Rózsahegyi, Máté and Kiss, Borbála Katalin and Virág, László and Gergely, Pál and Tóth, Attila and Bay, Péter (2011) Poly(ADP-ribose) polymerase-2 depletion reduces doxorubicin-induced damage through SIRT1 induction. Cardiovascular Research, 92 (3). pp. 430-438. ISSN 0008-6363 (print), 1755-3245 (online)

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Abstract

AIMS: Doxorubicin (DOX) is widely used in cytostatic treatments, although it may cause cardiovascular dysfunction as a side effect. DOX treatment leads to enhanced free radical production that in turn causes DNA strand breakage culminating in poly(ADP-ribose) polymerase (PARP) activation and mitochondrial and cellular dysfunction. DNA nicks can activate numerous enzymes, such as PARP-2. Depletion of PARP-2 has been shown to result in a protective phenotype against free radical-mediated diseases, suggesting similar properties in the case of DOX-induced vascular damage. METHODS AND RESULTS: PARP-2(+/+) and PARP-2(-/-) mice and aortic smooth muscle (MOVAS) cells were treated with DOX (25 mg/kg or 3 μM, respectively). Aortas were harvested 2-day post-treatment while MOVAS cells were treated with DOX for 7 hours. Aortas from PARP-2(-/-) mice displayed partial protection against DOX toxicity, and the protection depended on the conservation of smooth muscle but not on the conservation of endothelial function. DOX treatment evoked free radical production, DNA breakage and PARP activation. Importantly, depletion of PARP-2 did not quench any of these phenomena, suggesting an alternative mechanism. Depletion of PARP-2 prevented DOX-induced mitochondrial dysfunction through SIRT1 activation. Genetic deletion of PARP-2 resulted in the induction of the SIRT1 promoter and consequently increased SIRT1 expression both in aortas and in MOVAS cells. SIRT1 activation enhanced mitochondrial biogenesis, which provided protection against DOX-induced mitochondrial damage. CONCLUSION: Our data identify PARP-2 as a mediator of DOX toxicity by regulating vascular SIRT1 activity and mitochondrial biogenesis. Moreover, to the best of our knowledge, this is the first report of SIRT1 as a protective factor in the vasculature upon oxidative stress.

Item Type: Article
Subjects: Q Science / természettudomány > QD Chemistry / kémia
R Medicine / orvostudomány > R1 Medicine (General) / orvostudomány általában
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 17 Sep 2014 08:48
Last Modified: 17 Sep 2014 08:48
URI: http://real.mtak.hu/id/eprint/15212

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