Toggle Main Menu Toggle Search

Open Access padlockePrints

L-selegiline potentiates the cellular poly(ADP-ribosyl)ation response to ionizing radiation

Lookup NU author(s): Ragen Pfeiffer, Alan Leake, Professor Alexander Burkle

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Abstract

DNA strand breaks induced by alkylating agents, oxidants, or ionizing radiation trigger the covalent modification of nuclear proteins with poly(ADP-ribose), which is catalyzed for the most part by poly(ADP-ribose) polymerase-1 and plays a role in DNA base-excision repair. Poly(ADP-ribosyl)ation capacity of mononuclear blood cells correlates positively with life span of mammalian species. Here, we show that L-selegiline, an anti-Parkinson drug with neuroprotective activity and life span-extending effect in laboratory animals, can potentiate γ-radiation-induced poly(ADP-ribose) formation in intact cells. COR4 hamster cells were incubated with L-selegiline (50 nM) for various time periods, followed by γ-irradiation (45 Gy). Quantification of cellular poly(ADP-ribose) levels at 10 min after starting the irradiation revealed significant increases (up to 1.8-fold) in cells preincubated with the drug for 8 h to 7 days compared with drug-free irradiated controls. There was no selegiline-induced change in poly(ADP-ribose) levels of unirradiated cells nor in basal or radiation-induced DNA strand breaks, respectively. Surprisingly, poly(ADP-ribose) polymerase-1 protein was down-regulated by L-selegiline treatment. Addition of L-selegiline to purified poly(ADP-ribose) polymerase-1 did not alter enzymatic activity. In conclusion, the results of the present study identify a novel intervention to potentiate the cellular poly(ADP-ribosyl)ation response. We hypothesize that the effect of L-selegiline is due to modulation of accessory proteins regulating poly(ADP-ribose) polymerase-1 activity and that increased cellular poly(ADP-ribosyl)ation capacity may contribute to the neuroprotective potential and/or life span extension afforded by L-selegiline.


Publication metadata

Author(s): Brabeck C, Pfeiffer R, Leake A, Beneke S, Meyer R, Burkle A

Publication type: Article

Publication status: Published

Journal: Journal of Pharmacology and Experimental Therapeutics

Year: 2003

Volume: 306

Issue: 3

Pages: 973-979

ISSN (print): 0022-3565

ISSN (electronic): 1521-0103

Publisher: American Society for Pharmacology and Experimental Therapeutics

URL: http://dx.doi.org/10.1124/jpet.103.051342

DOI: 10.1124/jpet.103.051342

PubMed id: 12750436


Altmetrics

Altmetrics provided by Altmetric


Share