title: Nitric oxide attenuates the expression of natriuretic peptide receptor C and associated adenylyl cyclase signaling in aortic vascular smooth muscle cells: role of MAPK.
abstract: We have earlier shown that the treatment of A10 vascular smooth muscle cells with S-nitroso-N-acetyl-penicillamine (SNAP); nitric oxide donor (NO) for 24 h decreased the expression of natriuretic peptide receptor C (NPR-C) and adenylyl cyclase signaling. The present study was undertaken to examine the implication of different signaling mechanisms in a NO-induced response. The treatment of A10 vascular smooth muscle cells with SNAP decreased the expression of NPR-C and G(i)alpha proteins in a time-dependent manner. The expression of G(i)alpha proteins was decreased at 6 h, whereas the expression of NPR-C was attenuated at 2 h. The NPR-C-mediated inhibition of adenylyl cyclase was attenuated (approximately 50%) after 2 h of treatment and was completely abolished after 6 h of treatment. The decreased expression of NPR-C and NPR-C-mediated attenuation of adenylyl cyclase after 2 h of treatment was reversed to control levels by PD-98059, a MEK inhibitor. SNAP also modulated the ERK1/2 phosphorylation in a time-dependent manner; an increase was observed up to 2 h, and, thereafter, the ERK1/2 phosphorylation was decreased. On the other hand, 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one and KT-5823 inhibitor of soluble guanylyl cyclase and protein kinase G, respectively, and Mn(III)tetrakis(4-benzoic acid)porphyrin, a scavenger of peroxynitrite, were unable to restore the SNAP-induced decreased expression of NPR-C protein and increased ERK1/2 phosphorylation to control levels. However, the decreased levels of phosphorylated ERK1/2 and G(i)alpha proteins were restored to control levels by 8-bromo-cAMP. These results indicate that a temporal relationship follows between a NO-induced decreased expression of NPR-C and G(i)alpha proteins. The decreased expression of NPR-C is mediated through cGMP-independent but MAPK-dependent pathway, whereas NO-induced decreased levels of cAMP may contribute to the decreased activation of MAPK and thereby decreased the expression of G(i)alpha proteins.
authors.affiliation: Department of Physiology, Groupe de recherche sur le système nerveux autonome, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada.
authors.forename: Maria
authors.initials: M
authors.lastname: Arejian
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Madhu B
authors.initials: MB
authors.lastname: Anand-Srivastava
mesh_terms: D015124:8-Bromo Cyclic Adenosine Monophosphate / Q000494:pharmacology; D000067956:Adenylyl Cyclase Inhibitors; D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D001011:Aorta / Q000166:cytology; D002227:Carbazoles / Q000494:pharmacology; D002478:Cells, Cultured; D015536:Down-Regulation / Q000187:drug effects / Q000502:physiology; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000494:pharmacology; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism*; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000502:physiology*; D008665:Metalloporphyrins / Q000494:pharmacology; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism*; D020030:Nitric Oxide Donors / Q000494:pharmacology; D010069:Oxadiazoles / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D011810:Quinoxalines / Q000494:pharmacology; D051381:Rats; D017461:Receptors, Atrial Natriuretic Factor / Q000378:metabolism*; D026423:S-Nitroso-N-Acetylpenicillamine / Q000494:pharmacology
chemical_list: C095284:1H-(1,2,4)oxadiazolo(4,3-a)quinoxalin-1-one; D000067956:Adenylyl Cyclase Inhibitors; D002227:Carbazoles; D004791:Enzyme Inhibitors; D005419:Flavonoids; D016166:Free Radical Scavengers; C522851:Gnai1 protein, rat; D008665:Metalloporphyrins; D020030:Nitric Oxide Donors; D010069:Oxadiazoles; D047428:Protein Kinase Inhibitors; D011810:Quinoxalines; C097284:manganese(III)-tetrakis(4-benzoic acid)porphyrin; C073601:KT 5823; D015124:8-Bromo Cyclic Adenosine Monophosphate; D009569:Nitric Oxide; D026423:S-Nitroso-N-Acetylpenicillamine; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D019206:GTP-Binding Protein alpha Subunits, Gi-Go; D000262:Adenylyl Cyclases; D017461:Receptors, Atrial Natriuretic Factor; C073616:atrial natriuretic factor receptor C; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one