Acute cardiovascular effects of the calcimimetic R-568 and its enantiomer S-568 in rats
| Autor: | Niru Parekh, Eberhard Ritz, Kumiko Nakagawa, Franz Schaefer, Claus Peter Schmitt, Nadezda Koleganova |
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| Rok vydání: | 2008 |
| Předmět: |
Male
medicine.medical_specialty Calcimimetic Femoral vein Blood Pressure Femoral artery Cardiovascular System Renal Circulation Rats Sprague-Dawley Heart Rate Internal medicine medicine.artery Phenethylamines medicine Animals Splanchnic Circulation Hyperparathyroidism Aniline Compounds Dose-Response Relationship Drug Propylamines business.industry Stereoisomerism Blood flow medicine.disease Rats Blood pressure medicine.anatomical_structure Endocrinology Nephrology Renal blood flow Pediatrics Perinatology and Child Health business Receptors Calcium-Sensing Artery |
| Zdroj: | Pediatric nephrology (Berlin, Germany). 24(7) |
| ISSN: | 1432-198X |
| Popis: | Calcimimetics increase the sensitivity of the calcium sensing receptor (CaSR) to calcium ions (Ca(2+)) and allow for efficient control of uraemic hyperparathyroidism. Recent studies suggested an additional blood pressure-lowering action, the underlying mechanisms are as yet unknown. We infused R-568 and its enantiomer S-568, which has little activity at the CaSR, in anaesthetized rats. Mean arterial blood pressure (MAP) and heart rate (HR) were measured in the femoral artery; renal blood flow (RBF) and mesenteric blood flow (MBF) were measured locally. Infusion of R-568 at 0.7 mg/kg per 10 min into the femoral vein, a dose known to reduce levels of parathyroid hormone (PTH) and Ca(2+) in plasma, did not affect blood pressure or heart rate. Infusion of 2.1 mg/kg per 3 min of R-568 and S-568 into the femoral vein significantly reduced MAP by 26 +/- 4.5 and 23.7 +/- 3.1% and HR by 7.8 +/- 2.9 and 5.8 +/- 2.0%, respectively. Intra-arterial infusions of R-568 increased blood flow in a dose-dependent fashion. At plasma concentrations of 70 micromol/l R-568 and S-568 increased RBF by 17 +/- 3 and 15 +/- 3% and MBF by 28 +/- 5 and 29 +/- 5%. The effects on blood flow were greater in the mesenteric artery than in the renal artery, but not different between both compounds.The calcimimetic R-568 exerts acute, CaSR-independent, hypotensive effects via vasodilation and negative chronotropy at concentrations exceeding those required for modulation of PTH secretion. |
| Databáze: | OpenAIRE |
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