title: Dipyridamole increases gap junction coupling in bovine GM-7373 aortic endothelial cells by a cAMP-protein kinase A dependent pathway.
abstract: The scrape-loading/dye transfer technique was applied on the bovine aortic endothelial cell line GM-7373 to analyze the effects of the antithrombolytic drug dipyridamole on gap junction coupling in endothelial cells. We found that a cell treatment for 24 h with dipyridamole in therapeutically relevant concentrations (1-100 microM) increased gap junction coupling in a dose dependent manner. Similar to dipyridamole, forskolin as well as 8-Br-cAMP increased the gap junction coupling, while dibutyryl-cGMP (db-cGMP) did not affect the gap junction coupling of the GM-7373 endothelial cells. In parallel, a pharmacological inhibition of protein kinase A (PKA) with N-[2-(p-bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide dihydrochloride (H-89), antagonised the action of dipyridamole on gap junction coupling. We propose that the observed dipyridamole induced increase in gap junction coupling in endothelial cells is related to a cAMP-PKA dependent phosphorylation pathway. The report shows that gap junction coupling in endothelial cells is a suitable therapeutic target for treatment of cardiovascular diseases.
authors.affiliation: Institute of Biophysics, Leibniz University Hannover, Herrenhäuserstr. 2, 30419, Hannover, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Begandt
authors.forename: W
authors.initials: W
authors.lastname: Bintig
authors.forename: K
authors.initials: K
authors.lastname: Oberheide
authors.forename: S
authors.initials: S
authors.lastname: Schlie
authors.forename: A
authors.initials: A
authors.lastname: Ngezahayo
mesh_terms: D000818:Animals; D002417:Cattle; D002460:Cell Line; D017630:Connexins / Q000378:metabolism; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D004176:Dipyridamole / Q000494:pharmacology*; D042783:Endothelial Cells / Q000187:drug effects* / Q000378:metabolism*; D005343:Fibrinolytic Agents / Q000494:pharmacology; D017629:Gap Junctions / Q000187:drug effects* / Q000378:metabolism*; D007546:Isoquinolines / Q000494:pharmacology; D008954:Models, Biological; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology
chemical_list: D017630:Connexins; D005343:Fibrinolytic Agents; D007546:Isoquinolines; D047428:Protein Kinase Inhibitors; D013449:Sulfonamides; D004176:Dipyridamole; D017868:Cyclic AMP-Dependent Protein Kinases; C063509:N-(2-(4-bromocinnamylamino)ethyl)-5-isoquinolinesulfonamide