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alcohol-treated rats, heart rate, β1 receptors blockade, caffeine stress, epinephrine

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Panova, T., Koshelnyk, M., & Scherbak, S. (2017). THE CHANGES OF HUMORAL ADRENERGIC REGULATION OF HEART IN ALCOHOL-TREATED RATS. Medical Science of Ukraine (MSU), 13(1-2), 3-11.


Relevance. Under the chronic influence of ethanol the genes expression is changed which contain the information about synthesis of adrenergic receptors, epinephrine enzymes. However studies of the systemic manifestations of these changes are unknown. The distortion of the adrenergic drugs effect in an alcohol-treated organism is probable.

Objective: to investigate the adrenergic regulation of the heart in alcohol-treated rates by means of variation of the number of β1 receptors and their ligands.

Materials and methods. In control (n=10) and alcohol-treated rats chronically for 120 days (n=10) the number of β1-adrenergic receptors (by means of administration of concor cor selective blocker – 0,28 mg/kg) and the quantity of epinephrine in the blood (by means of activation of sympathoadrenal system after sodium caffeine-benzoate injection – 7,14 mg/kg) were varied. The concor cor and caffeine were administered separately and together. The heart rate (HR) was recorded with the help of sphygmomanometer. The results were processed by using MedStat package.

Results. In alcohol-treated rats chronically the HR is 27,6±2,5% higher than in the control ones (383,8±12,9 min-1 and 300,8±8,7 min-1). The caffeine administration leads to an increase in heart rate by 11,5±1,1 % in control rats (up to 335,4±9,5 min-1) while it doesn’t affect this index in alcohol-treated rats (389,6±12,6 min-1). The blockade of β1 receptors leads to a decrease in the HR by 7,5±0,7 % (up to 278,2±7,9 min-1) in control rats and by 15,5±1,1 % (up to 324,4±9,3 min-1) in alcohol-treated rats. When co-administration the β1 receptors blocker and caffeine have nivelated the opposite effects of each other in the control rats and HR remained the same (307,0±8,2 min-1); this has resulted in a decrease in the HR by 4,8±1,0 % (up to 365,4±10,9 min-1) in alcohol-treated animals.

Conclusions. It is assumed that the basal secretion of epinephrine is increased and the number of β1 receptors is decreased in alcohol-treated rats compared to control ones.
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