دورية أكاديمية
Cardiac noradrenergic mechanisms mediate GABA-enhanced ouabain cardiotoxicity.
| العنوان: | Cardiac noradrenergic mechanisms mediate GABA-enhanced ouabain cardiotoxicity. |
|---|---|
| المؤلفون: | McLemore GL; Department of Pharmacology, College of Medicine, Milton S. Hershey Medical Center of the Pennsylvania State University, Hershey 17033., Billingsley ML, Severs WB |
| المصدر: | Pharmacology [Pharmacology] 1994 Dec; Vol. 49 (6), pp. 343-50. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Karger Country of Publication: Switzerland NLM ID: 0152016 Publication Model: Print Cited Medium: Print ISSN: 0031-7012 (Print) Linking ISSN: 00317012 NLM ISO Abbreviation: Pharmacology Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Basel (Switzerland) : Karger, |
| مواضيع طبية MeSH: | Heart/*drug effects , Myocardium/*metabolism , Norepinephrine/*physiology , Ouabain/*pharmacology , Receptors, GABA-A/*metabolism , gamma-Aminobutyric Acid/*pharmacology, Analysis of Variance ; Animals ; Bradycardia/chemically induced ; Bradycardia/metabolism ; Dose-Response Relationship, Drug ; Glutamate Decarboxylase/metabolism ; Rats ; Rats, Inbred F344 ; Rats, Sprague-Dawley ; Rats, Wistar ; Reserpine/pharmacology ; Tyrosine 3-Monooxygenase/metabolism |
| مستخلص: | Peripherally administered gamma-aminobutyric acid (GABA) alters cardiovascular function and has been reported to enhance ouabain-induced cardiotoxicity in vivo. Control and reserpinized rat hearts were perfused in vitro to determine if GABA directly evokes bradycardia by GABAA receptors, interacts with ouabain, and if noradrenergic mechanisms are required. Also, double-staining immunohistochemistry was employed to determine whether GABA-ergic and noradrenergic synthetic enzymes were juxtaposed within atrial tissue. The main results were as follows. GABA produced a dose-dependent bradycardia (p < 0.05) by stimulating GABAA receptors in Langendorff-perfused hearts. Reserpinized hearts were unresponsive (p < 0.05) to GABA, except at the highest dose (20 mg/ml). Ouabain-induced cardiotoxicity was enhanced (p < 0.05) by GABA in isolated control, but not reserpinized hearts. Lastly, glutamic acid decarboxylase and tyrosine hydroxylase immunoreactivities were in close proximity in atrial slices. Collectively, the results document that GABA causes bradycardia and enhances ouabain cardiotoxicity by modulating noradrenergic mechanisms in the isolated rat heart. Since the synthetic enzymes for GABA and norepinephrine were in close proximity in atrial tissue, these transmitters may interact under physiological conditions. |
| المشرفين على المادة: | 0 (Receptors, GABA-A) 56-12-2 (gamma-Aminobutyric Acid) 5ACL011P69 (Ouabain) 8B1QWR724A (Reserpine) EC 1.14.16.2 (Tyrosine 3-Monooxygenase) EC 4.1.1.15 (Glutamate Decarboxylase) X4W3ENH1CV (Norepinephrine) |
| تواريخ الأحداث: | Date Created: 19941201 Date Completed: 19950403 Latest Revision: 20180214 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1159/000139253 |
| PMID: | 7878072 |
| قاعدة البيانات: | MEDLINE |
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