title: Effects of sodium azide on the secretion of soluble amyloid-beta precursor protein and the accumulation of beta-amyloid(1-40) in cultured chick neurons.
abstract: Sodium azide has been reported in the literature to reduce the release of secreted amyloid beta-precursor protein (AbetaPPs) and to produce a large increase in the cellular level of an 11.5 kDa C-terminal AbetaPP derivative containing the beta-amyloid (Abeta) sequence. Here we report that 1 mM of sodium azide, reduced the constitutive AbetaPPs secretion from cultured embryonic chick neurons after 12 h of incubation. After 24 h of incubation there was a modest increase in lactate dehydrogenase (LDH) release and no change in MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) reduction, suggesting that the reduced AbetaPPs secretion was not due to the cell toxic effects of NaN(3). However, NaN(3) reduced the accumulation of Abeta(1-40) in the cell lysates and decreased the acetylcholine esterase activity both in cell culture media and in cell lysates. It is concluded that the effect of NaN(3) upon AbetaPP metabolism in the chick cultured neurons may be a rather non-specific effect.
authors.affiliation: Department of Pharmacology and Clinical Neuroscience, Umeâ University, SE-901 87, Umeå, Sweden. henrietta.hedin@pharm.umu.se
authors.forename: H L
authors.initials: HL
authors.lastname: Hedin
authors.forename: C J
authors.initials: CJ
authors.lastname: Fowler
mesh_terms: D016229:Amyloid beta-Peptides / Q000037:antagonists & inhibitors / Q000378:metabolism*; D016564:Amyloid beta-Protein Precursor / Q000037:antagonists & inhibitors / Q000378:metabolism*; D000818:Animals; D015153:Blotting, Western; D002478:Cells, Cultured; D002642:Chick Embryo; D016895:Culture Media, Serum-Free; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007202:Indicators and Reagents; D010446:Peptide Fragments / Q000037:antagonists & inhibitors / Q000378:metabolism*; D019810:Sodium Azide / Q000494:pharmacology*
chemical_list: D016229:Amyloid beta-Peptides; D016564:Amyloid beta-Protein Precursor; D016895:Culture Media, Serum-Free; D004791:Enzyme Inhibitors; D007202:Indicators and Reagents; D010446:Peptide Fragments; C078592:amyloid beta-protein (1-40); D019810:Sodium Azide