Novel phenanthridinone inhibitors of poly (adenosine 5'-diphosphate-ribose) synthetase: potent cytoprotective and antishock agents


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Novel phenanthridinone inhibitors of poly (adenosine 5'-diphosphate-ribose) synthetase: potent cytoprotective and antishock agents
Critical Care Medicine
Jagtap  P., Soriano  F. G., Virag  L., Liaudet  L., Mabley  J., Szabo  E., Hasko  G., Marton  A., Lorigados  C. B., Gallyas, F., Jr. , Sumegi  B., Hoyt  D. G., Baloglu  E., VanDuzer  J., Salzman  A. L., Southan  G. J., Szabo  C.
0090-3493 (Print)
Statut éditorial
Date de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S. --- Old month value: May
OBJECTIVE: To synthesize novel inhibitors of the nuclear enzyme poly(adenosine 5'-diphosphate [ADP]-ribose) synthetase (PARS), also known as poly(ADP-ribose) polymerase (PARP), and to test them in in vitro models of oxidant-induced cytotoxicity and in endotoxin and splanchnic occlusion-reperfusion-induced shock. DESIGN: Randomized, prospective laboratory study. SETTING: Research laboratory. SUBJECTS: Murine macrophages, thymocytes, and endothelial cells; Balb/c mice and Wistar rats. INTERVENTIONS: Macrophages and endothelial cells were treated with peroxynitrite and bleomycin to induce PARS activation, and thymocytes were treated with peroxynitrite to induce cell necrosis. Novel PARS inhibitors were synthesized and used to reduce PARS activation and to reverse cytotoxicity. Balb/c mice were subjected to splanchnic occlusion and reperfusion and were pretreated with various doses (1-10 mg/kg intraperitoneally) of PJ34, a selected, potent, water-soluble PARS inhibitor. The passage of fluorescein isothiocyanate-conjugated dextran (4 kDa) was analyzed in everted gut ileal sacs incubated ex vivo as an index of gut permeability. Wistar rats were subjected to Escherichia coli bacterial lipopolysaccharide (40 mg/kg intraperitoneally). PJ34 was also used at 10 mg/kg intraperitoneally, 1 hr before lipopolysaccharide or at 25 mg/kg intraperitoneally 1 hr after lipopolysaccharide treatment. Serum concentrations of indicators or multiple organ injury, concentrations of various proinflammatory mediators, and tissue concentrations of myeloperoxidase and malondialdehyde were measured. In addition, survival rates and vascular contractile and relaxant responses were recorded. MEASUREMENTS AND MAIN RESULTS: Appropriate modifications of the phenanthridinone core structure yielded significant increases in the potency of the compounds, both as PARS inhibitors and as cytoprotective agents. The compound N-(6-oxo-5,6-dihydro-phenanthridin-2-yl) -N,N-dimethylacetamide (designated as PJ34) was one of the potent PARS inhibitors of the series, and it dose-dependently protected against thymocyte necrosis, with a half-maximal restoration of cell viability of 35 nM and complete protection at 200 nM. PARS activation also was visualized by immunohistochemistry and was dose-dependently suppressed by PJ34. The effect of PJ34 was dose-dependently reversed by excess nicotinamide adenine dinucleotide (oxidized). The PARS inhibitors dose-dependently suppressed proinflammatory cytokine and chemokine production and restored viability in immunostimulated macrophages. PJ34 was selected for the subsequent in vivo studies. PJ34 significantly protected against splanchnic reperfusion-induced intestinal hyperpermeability in the mouse. PJ34 reduced peak plasma concentrations of tumor necrosis factor-alpha, interleukin-1beta, and nitrite/nitrate in the plasma of lipopolysaccharide-treated rats. PJ34 ameliorated the lipopolysaccharide-induced increases in indexes of liver and kidney failure and concentrations of myeloperoxidase and malondialdehyde in the lung and gut. Lipopolysaccharide elicited vascular dysfunction, which was normalized by PJ34. Lipopolysaccharide-induced mortality was reduced by PJ34 (both pre- and posttreatment). CONCLUSIONS: The novel series of phenanthridinone PARS inhibitors have potent cytoprotective effects in vitro and significant protective effects in shock and reperfusion injury in rodent models in vivo.
Animals Bleomycin/pharmacology Cells, Cultured *Cytoprotection Dose-Response Relationship, Drug Enzyme Activation Enzyme Inhibitors/*pharmacology Interleukin-1/blood Kidney/chemistry Lipopolysaccharides/pharmacology Lung/chemistry Malondialdehyde/analysis Mice Mice, Inbred BALB C Nitrates/blood Nitrites/blood Peroxidase/analysis Peroxynitrous Acid/pharmacology Phenanthrenes/*pharmacology Poly(ADP-ribose) Polymerases/*antagonists & inhibitors Rats Rats, Wistar Shock/*prevention & control Tumor Necrosis Factor-alpha/analysis
Web of science
Création de la notice
24/01/2008 18:00
Dernière modification de la notice
20/08/2019 16:21
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