Effect of αα2-adrenoceptor stimulation on the isolated rat heart after acute myocardial infarction
- 作者: Kuptsova A.M.1, Ziyatdinova N.I.1, Sadykov A.M.1, Zefirov T.L.1
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隶属关系:
- Kazan (Volga Region) Federal University
- 期: 卷 16, 编号 3 (2025)
- 页面: 219-229
- 栏目: Original study articles
- URL: https://journal-vniispk.ru/2221-7185/article/view/357953
- DOI: https://doi.org/10.17816/CS678242
- EDN: https://elibrary.ru/DFXJXU
- ID: 357953
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Background: α2-Adrenoceptors (α2-ARs) are a family of G protein–coupled receptors. They are located on presynaptic membranes of adrenergic fibers, postsynaptic membranes of cardiomyocytes and vascular smooth muscle cells, as well as in the peripheral and central nervous systems, intestinal and renal epithelium, and the sarcolemma of cardiomyocytes. The cardioprotective properties of myocardial α2-ARs have been demonstrated. However, the specific contribution of α2-ARs to myocardial responses after infarction remains insufficiently understood.
AIM: The work aimed to investigate the effect of α2-AR stimulation on functional parameters of the isolated rat heart in a model of acute myocardial infarction.
METHODS: The experiment involved 48 outbred rats aged 100–120 days with a mean body weight of 200–250 g. Myocardial infarction was induced by ligation of the left anterior descending coronary artery. Ex vivo experiments were performed on isolated hearts. To evaluate the effects of α2-AR stimulation, clonidine hydrochloride was administered at concentrations of 10–9 M and 10–6 M.
RESULTS: Activation of α2-ARs (10–9 M, 10–6 M) produced opposite effects on the functional parameters of the isolated heart: it increased left ventricular developed pressure and coronary flow in sham-operated rats and those with acute myocardial infarction, whereas it decreased these parameters in healthy animals. Heart rate decreased in all groups during α2-AR stimulation, whereas in healthy rats the α2-AR agonist (10–6 M) induced bidirectional changes. Stimulation of α2-ARs (10–9 M) reduced contraction duration and increased relaxation and total contraction cycle duration of the left ventricular myocardium in healthy and sham-operated rats, whereas bidirectional effects were observed in rats with acute myocardial infarction. Activation of α2-ARs (10–6 M) induced bidirectional changes in contraction, relaxation, and contraction cycle duration of the left ventricular myocardium in healthy rats. Clonidine hydrochloride (10–6 M) did not affect contraction duration but increased relaxation and total contraction cycle duration in sham-operated rats and in those with acute myocardial infarction.
CONCLUSION: Activation of α2-ARs in rats with acute myocardial infarction alters the parameters of left ventricular developed pressure and coronary flow, decreases heart rate, and exerts bidirectional effects on the time–velocity characteristics of the left ventricular myocardium.
作者简介
Anna Kuptsova
Kazan (Volga Region) Federal University
编辑信件的主要联系方式.
Email: anuta0285@mail.ru
ORCID iD: 0000-0002-3592-6589
SPIN 代码: 3695-6970
Cand. Sci. (Biology), Assistant Professor
俄罗斯联邦, KazanNafisa Ziyatdinova
Kazan (Volga Region) Federal University
Email: nafisaz@mail.ru
ORCID iD: 0000-0002-4503-7451
SPIN 代码: 6539-5350
Dr. Sci. (Biology), Professor
俄罗斯联邦, KazanAiziriak Sadykov
Kazan (Volga Region) Federal University
Email: samow1995@mail.ru
ORCID iD: 0009-0009-8302-3833
SPIN 代码: 2136-1107
俄罗斯联邦, Kazan
Timur Zefirov
Kazan (Volga Region) Federal University
Email: zefirovtl@mail.ru
ORCID iD: 0000-0001-9557-1639
SPIN 代码: 5267-1350
MD, Dr. Sci. (Medicine), Professor
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