title: Cytoprotective effect of 1-nitro-2-phenylethane in mice pancreatic acinar cells subjected to taurocholate: putative role of guanylyl cyclase-derived 8-nitro-cyclic-GMP.
abstract: The nitroderivative 1-nitro-2-phenylethane (NPE) was recently described as a compound possessing heme-dependent soluble guanylyl cyclase (sGC) stimulating properties in vascular smooth muscle cells. In this study, we tested such pharmacological property of NPE in mice pancreatic acinar cells subjected to the bile salt taurocholate, a type of pathological stimulus that simulates pancreatitis. Here, isolated acinar cells were treated with NPE in order to assess the role of sGC on the detrimental effects induced by taurocholate. NPE reduced taurocholate-elicited Ca(2+) overload, production of reactive oxygen species (ROS), apoptosis, necrosis, and exerted a protective effect against mitochondrial membrane potential (ΔΨm) dissipation. These NPE-induced effects were abolished by pretreatment with ODQ and KT 5823, and after the blockade of nitric oxide (NO) synthase with l-NAME, inhibitors of key components of the sGC pathway. Contrarily to cGMP that alone increased ΔΨm collapse and cell damage, the cytoprotective effect of NPE on ΔΨm and cell necrosis was almost reproduced by 8-nitro-cGMP, a second messenger generated by sGC under oxidative stress conditions. In conclusion, putative sGC stimulation with NPE reveals its cytoprotective profile on pancreatic cells subjected to taurocholate. Moreover, ROS and NO conjunctly appear to drive sGC activity in pancreatic acinar cells to implement an adaptive mechanism in response to oxidative and Ca(2+) stress through 8-nitro-cGMPsynthesis.
authors.affiliation: Biomedical Institute of the Brazilian Semiarid (INCT-IBISAB-CNPq), Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará 60430-270, Brazil. Electronic address: fffcosker@yahoo.fr.
authors.forename: François
authors.initials: F
authors.lastname: Cosker
authors.affiliation: Biomedical Institute of the Brazilian Semiarid (INCT-IBISAB-CNPq), Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará 60430-270, Brazil.
authors.forename: Francisco J B
authors.initials: FJ
authors.lastname: Lima
authors.affiliation: Biomedical Institute of the Brazilian Semiarid (INCT-IBISAB-CNPq), Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará 60430-270, Brazil.
authors.forename: Saad
authors.initials: S
authors.lastname: Lahlou
authors.affiliation: Biomedical Institute of the Brazilian Semiarid (INCT-IBISAB-CNPq), Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará 60430-270, Brazil.
authors.forename: Pedro J C
authors.initials: PJ
authors.lastname: Magalhães
mesh_terms: D061354:Acinar Cells / Q000187:drug effects*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001555:Benzene Derivatives / Q000494:pharmacology*; D020013:Calcium Signaling / Q000502:physiology; D002478:Cells, Cultured; D006152:Cyclic GMP / Q000031:analogs & derivatives* / Q000378:metabolism; D008297:Male; D051379:Mice; D009336:Necrosis; D010179:Pancreas / Q000166:cytology* / Q000187:drug effects; D017382:Reactive Oxygen Species; D013656:Taurocholic Acid / Q000633:toxicity*
chemical_list: C541822:1-nitro-2-phenylethane; C525106:8-nitroguanosine 3',5'-cyclic monophosphate; D001555:Benzene Derivatives; D017382:Reactive Oxygen Species; D013656:Taurocholic Acid; D006152:Cyclic GMP
keywords: 8-Nitro-cGMP; Acute pancreatitis; Bile salts; Exocrine pancreas; Guanylyl cyclase