dc.contributor.author | Springer, Jeremy | |
dc.date.accessioned | 2012-11-20T15:51:50Z | |
dc.date.available | 2012-11-20T15:51:50Z | |
dc.date.issued | 2012-11-20 | |
dc.identifier.uri | http://hdl.handle.net/10222/15721 | |
dc.description.abstract | Natriuretic peptides are a group of hormones, including atrial-, brain-, and C-type- natriuretic peptides (ANP, BNP, CNP). BNP can bind to two NP receptors (NPRs) denoted NPR-A (activates guanylyl cyclase) and NPR-C (activates inhibitory G- proteins). This study investigated the electrophysiological effects of BNP on isolated mouse atrial myocytes. Current-clamp experiments show that BNP had no effect on action potential (AP) parameters in basal conditions; however, when pre-stimulated with the ?-adrenergic receptor agonist isoproterenol (ISO), BNP prolonged AP duration. Voltage-clamp experiments demonstrate that BNP increased L-type calcium current (ICa,L) in the presence of ISO without altering cardiac potassium currents. The BNP effect on ICa,L was blocked by A71915 (a selective NPR-A antagonist), maintained in myocytes lacking NPR-C receptors and blocked by the phosphodiesterase-3 (PDE-3) inhibitor milrinone. These data demonstrate that BNP prolongs AP duration and increases ICa,L in atrial myocytes by activating NPR-A, increasing intracellular cGMP, and inhibiting PDE- 3. | en_US |
dc.language.iso | en | en_US |
dc.subject | Brain type natriuretic peptide | en_US |
dc.subject | phosphodiesterase | en_US |
dc.subject | electrophysiology | en_US |
dc.subject | cardiac | en_US |
dc.subject | cGMP | en_US |
dc.subject | atrial | en_US |
dc.title | Brain type natriuretic peptide increases L-type Ca2+ current in atrial myocytes by activating natriuretic peptide receptor A | en_US |
dc.date.defence | 2011-08-02 | |
dc.contributor.department | Department of Physiology & Biophysics | en_US |
dc.contributor.degree | Master of Science | en_US |
dc.contributor.external-examiner | Dr. Susan Howlett | en_US |
dc.contributor.graduate-coordinator | Dr. Elizabeth Cowley | en_US |
dc.contributor.thesis-reader | Dr. Stacy O'Blenes | en_US |
dc.contributor.thesis-reader | Dr. Paul Linsdell | en_US |
dc.contributor.thesis-supervisor | Dr. Robert A. Rose | en_US |
dc.contributor.ethics-approval | Not Applicable | en_US |
dc.contributor.manuscripts | Not Applicable | en_US |
dc.contributor.copyright-release | Not Applicable | en_US |