title: Lysophosphatidylcholine activates mitogen-activated protein kinases by a tyrosine kinase-dependent pathway in bovine aortic endothelial cells.
abstract: Lysophosphatidylcholine (lyso-PC) is a major component of an atherogenic lipoprotein. In this study, to investigate the involvement of mitogen-activated protein kinases in the signaling pathway by lyso-PC in endothelial cells, we measured the activity of extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) in bovine aortic endothelial cells. Lyso-PC activated ERK and JNK in a dose-dependent manner. However, the time courses of activation of these kinases were different. ERK and JNK activation by lyso-PC was inhibited by a tyrosine kinase inhibitor, herbimycin A, but not by a protein kinase C (PKC) specific inhibitor. We conclude, therefore, that lyso-PC-mediated ERK and JNK activation is caused by a tyrosine kinase-dependent mechanism, but not conventional types of PKC-dependent mechanisms.
authors.affiliation: Department of Geriatric Medicine, Graduate School of Medicine, Kyoto University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ozaki
authors.forename: K
authors.initials: K
authors.lastname: Ishii
authors.forename: H
authors.initials: H
authors.lastname: Arai
authors.forename: N
authors.initials: N
authors.lastname: Kume
authors.forename: T
authors.initials: T
authors.lastname: Kita
mesh_terms: D000818:Animals; D016227:Benzoquinones; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000187:drug effects / Q000378:metabolism*; D002417:Cattle; D002478:Cells, Cultured / Q000378:metabolism; D002850:Chromatography, Gel; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D004730:Endothelium, Vascular / Q000166:cytology / Q000201:enzymology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D048031:JNK Mitogen-Activated Protein Kinases; D047029:Lactams, Macrocyclic; D008244:Lysophosphatidylcholines / Q000378:metabolism* / Q000494:pharmacology; D008564:Membrane Potentials; D020928:Mitogen-Activated Protein Kinases; D011809:Quinones / Q000494:pharmacology; D017828:Rifabutin / Q000031:analogs & derivatives; D015398:Signal Transduction
chemical_list: D016227:Benzoquinones; D004791:Enzyme Inhibitors; D047029:Lactams, Macrocyclic; D008244:Lysophosphatidylcholines; D011809:Quinones; D017828:Rifabutin; C020754:herbimycin; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases