Abstract | BACKGROUND: METHODS: Rat PT cell cultures were incubated with H2O2 (1 mM) either in the presence or absence of the PARS inhibitors 3-aminobenzamide (3-AB, 3 mM), 1,5-dihydroxyisoquinoline (0.3 mM) or nicotinamide (Nic, 3 mM), or increasing concentrations of desferrioxamine (0.03 to 3 mM) or catalase (0.03 to 3 U/ml). Cellular injury and death were determined using the MTT and lactate dehydrogenase (LDH) assays, respectively. H2O2-mediated PARS activation in rat PT cells and the effects of PARS inhibitors on PARS activity were determined by measurement of the incorporation of [3H] NAD into nuclear proteins. RESULTS: Incubation of rat PT cells with H2O2 significantly inhibited mitochondrial respiration and increased LDH release, respectively. Both desferrioxamine and catalase reduced H2O2-mediated cellular injury and death. All three PARS inhibitors significantly attenuated the H2O2-mediated decrease in mitochondrial respiration and the increase in LDH release. Incubation with H2O2 produced a significant increase in PARS activity that was significantly reduced by all PARS inhibitors. 3-Aminobenzoic acid (3 mM) and nicotinic acid (3 mM), structural analogs of 3-AB and Nic, respectively, which did not inhibit PARS activity, did not reduce the H2O2-mediated injury and necrosis in cultures of rat PT cells. CONCLUSION: We propose that PARS activation contributes to ROS-mediated injury of rat PT cells and, therefore, to the cellular injury and cell death associated with conditions of oxidant stress in the kidney.
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Authors | P K Chatterjee, S Cuzzocrea, C Thiemermann |
Journal | Kidney international
(Kidney Int)
Vol. 56
Issue 3
Pg. 973-84
(Sep 1999)
ISSN: 0085-2538 [Print] United States |
PMID | 10469365
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Benzamides
- Enzyme Inhibitors
- Isoquinolines
- Poly(ADP-ribose) Polymerase Inhibitors
- Niacinamide
- 1,5-dihydroxyisoquinoline
- 3-aminobenzamide
- Hydrogen Peroxide
- L-Lactate Dehydrogenase
- Catalase
- Deferoxamine
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Topics |
- Animals
- Benzamides
(pharmacology)
- Catalase
(pharmacology)
- Cells, Cultured
- DNA Damage
- Deferoxamine
(pharmacology)
- Enzyme Activation
(drug effects)
- Enzyme Inhibitors
(pharmacology)
- Hydrogen Peroxide
(toxicity)
- Isoquinolines
(pharmacology)
- Kidney Tubules, Proximal
(cytology, drug effects, metabolism)
- L-Lactate Dehydrogenase
(metabolism)
- Necrosis
- Niacinamide
(pharmacology)
- Oxidative Stress
(drug effects)
- Poly(ADP-ribose) Polymerase Inhibitors
- Rats
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