title: Activation of phospholipases A2 and D of a human neuroblastoma cell line (LA-N-2) by N-dodecyl-L-lysine amide (compound 24), a putative G protein activator: characteristics of inhibition by (-)-nicotine.
abstract: Compound 24, an alkyl-substituted amino acid amide, previously found to activate pertussis toxin-sensitive G proteins in cell membranes and membrane protein fractions, was used as a tool to determine the mechanism/location of nicotine inhibition of amyloid beta peptide-stimulated phospholipase A2 and D activities in a human neuroblastoma cell line, LA-N-2, in vitro. In contrast to our previous findings with amyloid beta peptide, these phospholipase activations by compound 24 were not inhibited by (-)-nicotine, cholera toxin or tetanus toxin pretreatment. The contrasting activation of these phospholipases by amyloid beta peptide and compound 24 are discussed.
authors.affiliation: Department of Pharmacology and Therapeutics, University of Manitoba, A220-770 Bannatyne Avenue, Winnipeg, MB, Canada R3E 0W3.
authors.forename: Byron M
authors.initials: BM
authors.lastname: Garnham
authors.forename: Shirley
authors.initials: S
authors.lastname: Fitzpatrick-Wong
authors.forename: Walter
authors.initials: W
authors.lastname: Schunack
authors.forename: Bernd
authors.initials: B
authors.lastname: Nürnberg
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Sorrentino
authors.forename: Fiona E
authors.initials: FE
authors.lastname: Parkinson
authors.forename: Julian N
authors.initials: JN
authors.lastname: Kanfer
authors.forename: Daniel S
authors.initials: DS
authors.lastname: Sitar
mesh_terms: D001483:Base Sequence; D017931:DNA Primers; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D019204:GTP-Binding Proteins / Q000378:metabolism*; D006801:Humans; D008239:Lysine / Q000031:analogs & derivatives / Q000494:pharmacology*; D009447:Neuroblastoma / Q000201:enzymology* / Q000473:pathology; D009538:Nicotine / Q000494:pharmacology*; D010739:Phospholipase D / Q000037:antagonists & inhibitors / Q000378:metabolism*; D010741:Phospholipases A / Q000037:antagonists & inhibitors / Q000378:metabolism*; D054467:Phospholipases A2; D011978:Receptors, Nicotinic / Q000235:genetics / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D017931:DNA Primers; D004791:Enzyme Inhibitors; C472367:N-dodecyl-L-lysine amide; D011978:Receptors, Nicotinic; D009538:Nicotine; D010741:Phospholipases A; D054467:Phospholipases A2; D010739:Phospholipase D; D019204:GTP-Binding Proteins; D008239:Lysine