title: Inhibitory effects of mesoionic 3-aryl substituted oxatriazole-5-imine derivatives on vascular smooth muscle cell mitogenesis and proliferation in vitro.
abstract: 1. The effects of oxatriazole-type (GEA 3162 and GEA 5624) nitric oxide (NO) donors on mitogenesis and proliferation were studied in vascular smooth muscle cell (VSMC) culture. The effects of the GEA-compounds were compared with well-known NO-donors 3-morpholinosydnonimine (SIN-1) and S-nitroso-N-acetylpenicillamine (SNAP). 2. All NO-donors released NO and increased the production of cyclic GMP concentration-dependently. The production of cyclic GMP was inhibited by the guanylate cyclase inhibitor, ODQ (1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one). 3. The NO-donors inhibited basal and serum-induced DNA synthesis concentration-dependently. The GEA-compounds were needed in concentrations 10 times lower than SIN-1 and SNAP. GEA 3162, SIN-1 and SNAP were also able to inhibit serum-induced cell proliferation. GEA 5624 was ineffective. The antimitogenic effect of NO-donors was not reduced by inhibiting the guanylate cyclase. 4. These results suggest that NO inhibits serum-induced DNA synthesis and proliferation of VSMC by a cyclic GMP-independent mechanism. The oxatriazole-type NO-donor GEA 3162 was found to be a more potent inhibitor of mitogenesis and cell proliferation than SIN-1 and SNAP.
authors.affiliation: Institute of Biomedicine, Department of Pharmacology and Toxicology, University of Helsinki, Finland.
authors.forename: T
authors.initials: T
authors.lastname: Lähteenmäki
authors.forename: E
authors.initials: E
authors.lastname: Sievi
authors.forename: H
authors.initials: H
authors.lastname: Vapaatalo
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D006152:Cyclic GMP / Q000378:metabolism; D004247:DNA / Q000096:biosynthesis / Q000187:drug effects; D008297:Male; D008981:Molsidomine / Q000031:analogs & derivatives / Q000494:pharmacology; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D020030:Nitric Oxide Donors / Q000494:pharmacology*; D009573:Nitrites / Q000378:metabolism; D010396:Penicillamine / Q000031:analogs & derivatives / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D015398:Signal Transduction; D014230:Triazoles / Q000494:pharmacology*; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: C116249:GEA 5624; D020030:Nitric Oxide Donors; D009573:Nitrites; C110881:S-nitro-N-acetylpenicillamine; D014230:Triazoles; C002385:linsidomine; C082874:GEA 3162; D014508:Urea; D004247:DNA; D008981:Molsidomine; D010396:Penicillamine; D006152:Cyclic GMP