title: Rabbit extracellular superoxide dismutase: expression and effect on LDL oxidation.
abstract: Extracellular superoxide dismutase (EC-SOD) is a secreted antioxidative enzyme with an abundant mRNA expression in kidney and arterial wall. In order to study expression and antioxidative function of EC-SOD, we cloned the rabbit ec-sod cDNA and produced the recombinant protein in cell culture. In vitro studies did not show a direct relationship between the amounts of synthesized mRNA and secreted protein activity, suggesting post-transcriptional regulation. The antiatherogenic role of EC-SOD was studied by determining the effect of EC-SOD on the oxidation (ox) of low density lipoprotein (LDL), and subsequent degradation of oxLDL in RAW 264 macrophages in vitro. It was found that recombinant EC-SOD reduced both the degradation of LDL in RAW 264 macrophages by 28-36% and its electrophoretic mobility caused by endothelial cell-mediated oxidation. It is therefore suggested that EC-SOD can act as a protective enzyme against the development of atherosclerosis.
authors.affiliation: A.I. Virtanen Institute for Molecular Sciences, University of Kuopio, P.O. Box 1627, FIN-70211, Kuopio, Finland.
authors.forename: M O
authors.initials: MO
authors.lastname: Laukkanen
authors.forename: P
authors.initials: P
authors.lastname: Lehtolainen
authors.forename: P
authors.initials: P
authors.lastname: Turunen
authors.forename: S
authors.initials: S
authors.lastname: Aittomäki
authors.forename: P
authors.initials: P
authors.lastname: Oikari
authors.forename: S L
authors.initials: SL
authors.lastname: Marklund
authors.forename: S
authors.initials: S
authors.lastname: Ylä-Herttuala
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D016466:CHO Cells; D002460:Cell Line; D003001:Cloning, Molecular; D006224:Cricetinae; D005110:Extracellular Space / Q000201:enzymology; D015971:Gene Expression Regulation, Enzymologic; D008077:Lipoproteins, LDL / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011817:Rabbits; D013482:Superoxide Dismutase / Q000235:genetics* / Q000378:metabolism; D014018:Tissue Distribution
chemical_list: D008077:Lipoproteins, LDL; D012333:RNA, Messenger; C099252:oxidized low density lipoprotein; D013482:Superoxide Dismutase