title: The effect of N-methyl-2-pyridone-5-carboxamide--A nicotinamide catabolite on poly ADP-rybosylation and oxidative stress injury in endothelial cells.
abstract: This study evaluated the effect of nicotinamide (NA) and its endogenous metabolite 2PY (N-methyl-2-pyridone-5-carboxamide) on the activity of poly (ADP-ribose) polymerase (PARP) and on peroxynitrite-induced injury in endothelial cells. 2PY and NA inhibited isolated PARP with half-maximal constants of 0.53 mM and 0.025 mM, respectively. Exposure to peroxynitrite caused a decrease of the NAD pool in cultured endothelial cells to below 10% of initial level. Addition of 2PY or NA provided partial protection from peroxynitrite-induced NAD depletion, with NA being more effective. 2PY and NA also provide protection from ATP depletion. We conclude that NA as well as 2PY protect from oxidative stress injury in endothelial cells by inhibition of PARP and protection from NAD depletion. This, in turn, protects energetics, allowing maintaining cellular ATP.
authors: Department of Biochemistry, Medical University of Gdansk, Gdansk, Poland.
authors: E M
authors: EM
authors: Slominska
authors: R T
authors: RT
authors: Smolenski
authors: F
authors: F
authors: Osborne
authors: J
authors: J
authors: Swierczynski
authors: M H
authors: MH
authors: Yacoub
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D004730:Endothelium, Vascular / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000494:pharmacology; D018384:Oxidative Stress; D030421:Peroxynitrous Acid / Q000737:chemistry; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism
chemical_list: D030421:Peroxynitrous Acid; D000246:Adenosine Diphosphate Ribose; D009536:Niacinamide; C005211:N'-methyl-2-pyridone-5-carboxamide; D011065:Poly(ADP-ribose) Polymerases