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

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


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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


DOI: 10.1124/jpet.103.051342

PubMed id: 12750436


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