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Peroxynitrite-mediated DNA strand breakage activates poly-adenosine diphosphate ribosyl synthetase and causes cellular energy depletion in macrophages stimulated with bacterial lipopolysaccharide.
J Immunol. 1996 Jan 01; 156(1):350-8.JI

Abstract

The inducible isoform of nitric oxide (NO) synthase produces large quantities of NO, a cytotoxic free radical. Recent studies show that treatment with exogenous NO produces DNA strand breaks, activating the nuclear repair enzyme poly(ADP)ribosyltransferase (PARS), which results in ADP ribosylation, NAD+ consumption, and exhaustion of intracellular energy stores. Here we have characterized the cytotoxic effect of endogenous NO and peroxynitrite, a reactive oxidant formed from NO and superoxide. Immunostimulation of J774.2 macrophages with endotoxin resulted in the generation of superoxide (within 1 h) and NO (after 8 h). NO production paralleled an increase in peroxynitrite formation and DNA strand breakage, and a decrease in intracellular NAD+ content and mitochondrial respiration. Inhibition of NO synthase by NG-methyl-L-arginine or S-methyl-isothiourea or inhibition of PARS activity by 3-aminobenzamide or nicotinamide prevented the decrease in mitochondrial respiration and the depletion of NAD+. A similar pattern of free radical formation and cytotoxicity was observed in peritoneal macrophages from endotoxemic rats (formation of NO, superoxide, peroxynitrite, and DNA strand breaks). In vivo treatment with 3-aminobenzamide preserved mitochondrial respiration, NAD+, and ATP. Our data suggest that inflammatory cell injury involved DNA strand breakage and PARS, triggering an energy-consuming, futile repair cycle leading to cellular energy depletion. The active species responsible for the development of DNA strand breaks is peroxynitrite, rather than NO, since exogenous peroxynitrite, but not NO, induces DNA strand breaks. Inhibition of PARS may improve cellular energy homeostasis in patho-physiologic conditions associated with peroxynitrite generation.

Authors+Show Affiliations

Division of Critical Care, Children's Hospital Medical Center, Cincinnati, OH 45229, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8598485

Citation

Zingarelli, B, et al. "Peroxynitrite-mediated DNA Strand Breakage Activates Poly-adenosine Diphosphate Ribosyl Synthetase and Causes Cellular Energy Depletion in Macrophages Stimulated With Bacterial Lipopolysaccharide." Journal of Immunology (Baltimore, Md. : 1950), vol. 156, no. 1, 1996, pp. 350-8.
Zingarelli B, O'Connor M, Wong H, et al. Peroxynitrite-mediated DNA strand breakage activates poly-adenosine diphosphate ribosyl synthetase and causes cellular energy depletion in macrophages stimulated with bacterial lipopolysaccharide. J Immunol. 1996;156(1):350-8.
Zingarelli, B., O'Connor, M., Wong, H., Salzman, A. L., & Szabó, C. (1996). Peroxynitrite-mediated DNA strand breakage activates poly-adenosine diphosphate ribosyl synthetase and causes cellular energy depletion in macrophages stimulated with bacterial lipopolysaccharide. Journal of Immunology (Baltimore, Md. : 1950), 156(1), 350-8.
Zingarelli B, et al. Peroxynitrite-mediated DNA Strand Breakage Activates Poly-adenosine Diphosphate Ribosyl Synthetase and Causes Cellular Energy Depletion in Macrophages Stimulated With Bacterial Lipopolysaccharide. J Immunol. 1996 Jan 1;156(1):350-8. PubMed PMID: 8598485.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Peroxynitrite-mediated DNA strand breakage activates poly-adenosine diphosphate ribosyl synthetase and causes cellular energy depletion in macrophages stimulated with bacterial lipopolysaccharide. AU - Zingarelli,B, AU - O'Connor,M, AU - Wong,H, AU - Salzman,A L, AU - Szabó,C, PY - 1996/1/1/pubmed PY - 1996/1/1/medline PY - 1996/1/1/entrez SP - 350 EP - 8 JF - Journal of immunology (Baltimore, Md. : 1950) JO - J Immunol VL - 156 IS - 1 N2 - The inducible isoform of nitric oxide (NO) synthase produces large quantities of NO, a cytotoxic free radical. Recent studies show that treatment with exogenous NO produces DNA strand breaks, activating the nuclear repair enzyme poly(ADP)ribosyltransferase (PARS), which results in ADP ribosylation, NAD+ consumption, and exhaustion of intracellular energy stores. Here we have characterized the cytotoxic effect of endogenous NO and peroxynitrite, a reactive oxidant formed from NO and superoxide. Immunostimulation of J774.2 macrophages with endotoxin resulted in the generation of superoxide (within 1 h) and NO (after 8 h). NO production paralleled an increase in peroxynitrite formation and DNA strand breakage, and a decrease in intracellular NAD+ content and mitochondrial respiration. Inhibition of NO synthase by NG-methyl-L-arginine or S-methyl-isothiourea or inhibition of PARS activity by 3-aminobenzamide or nicotinamide prevented the decrease in mitochondrial respiration and the depletion of NAD+. A similar pattern of free radical formation and cytotoxicity was observed in peritoneal macrophages from endotoxemic rats (formation of NO, superoxide, peroxynitrite, and DNA strand breaks). In vivo treatment with 3-aminobenzamide preserved mitochondrial respiration, NAD+, and ATP. Our data suggest that inflammatory cell injury involved DNA strand breakage and PARS, triggering an energy-consuming, futile repair cycle leading to cellular energy depletion. The active species responsible for the development of DNA strand breaks is peroxynitrite, rather than NO, since exogenous peroxynitrite, but not NO, induces DNA strand breaks. Inhibition of PARS may improve cellular energy homeostasis in patho-physiologic conditions associated with peroxynitrite generation. SN - 0022-1767 UR - https://www.unboundmedicine.com/medline/citation/8598485/Peroxynitrite_mediated_DNA_strand_breakage_activates_poly_adenosine_diphosphate_ribosyl_synthetase_and_causes_cellular_energy_depletion_in_macrophages_stimulated_with_bacterial_lipopolysaccharide_ L2 - https://www.jimmunol.org/lookup/pmidlookup?view=long&pmid=8598485 DB - PRIME DP - Unbound Medicine ER -