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Oligotide, a new single-stranded oligodeoxyribonucleotide, preserves postsynaptic beta-adrenergic and cholinergic
1Department of Pharmacology, Chemotherapy and Medical Toxicology, University of Milan, Italy.
Abstract:
Acute myocardial infarction was induced in New Zealand male albino rabbits. 3 days after surgery, the mortality rate and plasma CPK activity were reduced by 64% and 66% respectively by intravenous infusion of Oligotide (32 mg/kg/h for 6h), a single-stranded oligodeoxyribonucleotide of mammalian origin. Perfused hearts, obtained from Oligotide-treated rabbits 3 days after surgery, showed a strength of contraction in the range of that of hearts of sham-operated animals and an ameliorated postsynaptic beta-adrenergic and cholinergic receptor function. In addition, in these hearts, "ex vivo" treatment with Oligotide resulted in almost complete preservation of both adrenergic and cholinergic responses to their specific agonists. These data suggest that Oligotide by protecting the hearts from the ischemic damage and possibly by restricting left ventricular tissue necrosis may have normalized the biological responses of this organ to isoproterenol and preserved the integrity of coronary endothelial-dependent relaxant function.
Insights
Oligotide treatment significantly reduced mortality and cardiac damage in rabbits with myocardial infarction. This cardiac drug preserved heart function and receptor responses, suggesting protective effects against ischemic injury.
Area of Science:
- Cardiology
- Pharmacology
- Molecular Biology
Background:
- Acute myocardial infarction (AMI) leads to significant mortality and cardiac dysfunction.
- Current treatments aim to limit infarct size and preserve cardiac function.
- Oligotide, a novel oligodeoxynucleotide, is investigated for its cardioprotective potential.
Purpose of the Study:
- To evaluate the efficacy of Oligotide in a rabbit model of acute myocardial infarction.
- To assess Oligotide's impact on mortality, cardiac enzyme levels, and cardiac function post-MI.
- To investigate Oligotide's effects on beta-adrenergic and cholinergic receptor function in the infarcted heart.
Main Methods:
- Acute myocardial infarction was induced in male New Zealand albino rabbits.
- Oligotide (32 mg/kg/h for 6h) was administered intravenously.
- Mortality rate, plasma creatine phosphokinase (CPK) activity, and cardiac contractility were measured.
- Postsynaptic beta-adrenergic and cholinergic receptor function were assessed in ex vivo perfused hearts.
Main Results:
- Oligotide treatment reduced mortality by 64% and plasma CPK activity by 66%.
- Hearts from Oligotide-treated rabbits exhibited preserved contractile strength and improved receptor function.
- Ex vivo treatment with Oligotide further preserved adrenergic and cholinergic responses to agonists.
Conclusions:
- Oligotide demonstrates significant cardioprotective effects in a rabbit model of myocardial infarction.
- The drug appears to protect against ischemic damage, limit necrosis, and preserve cardiac function.
- Oligotide may normalize biological responses to stress and maintain coronary endothelial function.