title: Effects of platelet-activating factor on electrophysiology of isolated retinas and their inhibition by BN 52021, a specific PAF-acether receptor antagonist.
abstract: The effects of (R)PAF-acether have been tested on the isolated rat retina model. Results indicate that (R)PAF-acether inhibits the electrophysiological response (electroretinogram) elicited on isolated retina by a brief light flash. Immediately after the administration of (R)PAF-acether, an irreversible decrease of the electroretinogram b-wave amplitude is observed. This effect is dose-dependent (2 X 10(-11) M, 2 X 10(-9) M, 2 X 10(-7) M) and partially inhibited by simultaneous administration of Ginkgolide B (BN 52021; 2 X 10(-5) M). These results suggest the existence of (R)PAF-acether-specific receptors inside the retina.
mesh_terms: D000818:Animals; D004224:Diterpenes; D004594:Electrophysiology; D004596:Electroretinography; D046934:Ginkgolides; D066298:In Vitro Techniques; D007783:Lactones; D010936:Plant Extracts / Q000494:pharmacology*; D010972:Platelet Activating Factor / Q000037:antagonists & inhibitors / Q000502:physiology*; D010980:Platelet Membrane Glycoproteins; D051381:Rats; D011956:Receptors, Cell Surface / Q000187:drug effects / Q000502:physiology; D043562:Receptors, G-Protein-Coupled; D012160:Retina / Q000187:drug effects* / Q000502:physiology
chemical_list: D004224:Diterpenes; D046934:Ginkgolides; D007783:Lactones; D010936:Plant Extracts; D010972:Platelet Activating Factor; D010980:Platelet Membrane Glycoproteins; D011956:Receptors, Cell Surface; D043562:Receptors, G-Protein-Coupled; C039351:platelet activating factor receptor; C045856:ginkgolide B