INO-8875, a highly selective A1 adenosine receptor agonist: Evaluation of chronotropic, dromotropic, and hemodynamic effects in rats

Michal Mor, Aryeh Shalev, Shani Dror, Oleg Pikovsky, Ofer Beharier, Arie Moran, Amos Katz, Yoram Etzion

Research output: Contribution to journalArticlepeer-review

Abstract

Selective pharmacological activation of the adenosine 1 receptor (A1R) is a promising new approach to achieve a potent block of atrioventricular (A-V)-nodal conduction without significant cardiovascular side effects. The purpose of the present study was to evaluate the cardiovascular profile of INO-8875, a highly selective A1R agonist, and to compare its properties with N -[3( R )-tetrahydrofuranyl]-6-aminopurine riboside (CVT-510), which has already been shown to induce negative dromotropic effects with minimal cardiovascular side effects in animals and in clinical studies. Dose-response experiments in the isolated hearts of rats were used to evaluate the functional selectivity of INO-8875 for the slowing of A-V-nodal conduction. Ventilated adult rats were used to study the effects of INO-8875, in vivo, on arterial blood pressure as well as on supraventricular electrophysiology. Ex vivo, INO-8875 (100 nM to 3 μM) progressively prolonged A-V- nodal conduction without reducing left ventricular function or coronary resistance. In vivo, INO-8875 up to a dose of 50 μg/kg did not reduce the carotid arterial blood pressure ( n = 4). INO-8875 (1 - 50 μg/kg) and CVT-510 (20 and 50 μg/kg) both induced a dose-dependent decrease in heart rate and atrial refractoriness, as well as slowing of A-V - nodal conduction. However, compared with CVT-510, the activity of INO-8875 was more pronounced in A-V - nodal function. INO-8875 exhibited a greater duration of action, lasting up to 2.5 hours post dosing, whereas the effects of CVT-510 dissipated over 1 hour. INO-8875 demonstrates functional properties of a highly selective A 1R agonist. INO-8875 exhibits an increased dromotropic effect and greater duration of action compared with CVT-510.

Original languageAmerican English
Pages (from-to)59-67
Number of pages9
JournalJournal of Pharmacology and Experimental Therapeutics
Volume344
Issue number1
DOIs
StatePublished - 1 Jan 2013

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Pharmacology

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