title: Effect of Purine Co-Transmitters on Automatic Activity Caused by Norepinephrine in Myocardial Sleeves of Pulmonary Veins.
abstract: We studied the effect of extracellular purine nucleotides (NAD+and ATP) on spontaneous arrhythmogenic activity caused by norepinephrine in myocardial sleeves of pulmonary veins. In pulmonary veins, NAD+and ATP reduced the frequency of action potentials and their duration at regular type of spontaneous activity caused by norepinephrine. NAD+and ATP lengthened the intervals between spike bursts at periodic (burst) type of spontaneous activity. In addition, ATP shortened the duration of spike bursts and the number of action potentials in the "bursts" caused by norepinephrine in the pulmonary veins. It was hypothesized that NAD+and ATP attenuate the effects of sympathetic stimulation and when released together with norepinephrine from sympathetic endings in vivo, probably, reduce arrhythmogenic activity in myocardial sleeves of pulmonary veins.
authors.affiliation: Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia. vm_karimova@mail.ru.
authors.forename: V M
authors.initials: VM
authors.lastname: Karimova
authors.affiliation: Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia.|Department of Physiology, N. I. Pirogov Russian National Research Medical University, Moscow, Russia.
authors.forename: K B
authors.initials: KB
authors.lastname: Pustovit
authors.affiliation: Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia.|Department of Physiology, N. I. Pirogov Russian National Research Medical University, Moscow, Russia.
authors.forename: D V
authors.initials: DV
authors.lastname: Abramochkin
authors.affiliation: Department of Human and Animal Physiology, M. V. Lomonosov Moscow State University, Moscow, Russia.|Department of Physiology, N. I. Pirogov Russian National Research Medical University, Moscow, Russia.
authors.forename: V S
authors.initials: VS
authors.lastname: Kuz'min
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000255:Adenosine Triphosphate / Q000494:pharmacology*; D000818:Animals; D008297:Male; D009206:Myocardium; D009243:NAD / Q000494:pharmacology*; D009638:Norepinephrine / Q000494:pharmacology; D011667:Pulmonary Veins / Q000187:drug effects / Q000502:physiology*; D051381:Rats
chemical_list: D009243:NAD; D000255:Adenosine Triphosphate; D009638:Norepinephrine
keywords: ATP; NAD+; arrhythmogenic activity; atrial fibrillation; pulmonary veins