5天寒冷适应条件下肾上腺素对区域血流调节中功能性交感抑制的肾上腺素能机制
- 作者: Ananev V.N.1, Ananev G.V.2, Torshin V.I.3, Ananeva O.V.4
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隶属关系:
- Institute of Biomedical Problems of the Russian Academy of Sciences
- Pharmstandard JSC
- Peoples’ Friendship University of Russia
- Tyumen State Medical University
- 期: 卷 32, 编号 1 (2025)
- 页面: 64-73
- 栏目: ORIGINAL STUDY ARTICLES
- URL: https://journal-vniispk.ru/1728-0869/article/view/314571
- DOI: https://doi.org/10.17816/humeco678047
- EDN: https://elibrary.ru/IQWLOU
- ID: 314571
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BACKGROUND:. During muscle contraction, blood flow in the working muscles increases tens of times due to the mechanisms of sympatholysis. However, there are no studies that would quantitatively describe the effect of epinephrine on arterial alpha-adrenergic receptors during sympatholysis against the background of 5-day cold adaptation.
AIM: Objective. To study the effect of five-day cold adaptation on the adrenoreactivity of muscle arterial vessels during sympatholysis to different doses of epinephrine.
MATERIAL AND METHODS: Material and methods. The experiments were carried out in 4 groups of rabbits. Control group (N1, n = 20) of rabbits. Sympatholysis group (N2, n = 15): electrical stimulation of muscles (frequency 5 Hz, voltage 10 V, L = 5 ms) to induce sympatholysis. Cold adaptation group (N3, n = 15) after 5-day exposure in a climatic chamber (−10 ° C, 6 h / day). Group (N4, n=15): combination of 5 days of cold adaptation with sympatholysis. In all rabbits, the limb muscles were perfused with blood through the femoral artery after ligation of all anastomoses using a constant-flow pump. After the introduction of 8 doses of epinephrine (0.5–30 μg/kg), the adrenoreactivity of the limb arteries was analyzed using the dose-effect reaction in double inverse Lineweaver–Burk coordinates. This allowed us to determine the number of active adrenoreceptors (Pm) and the sensitivity (1/Km) of adrenoreceptors to epinephrine.
RESULTS: Sympatholysis after 5 days of cold adaptation (N4) was much less for all doses of epinephrine than without cold (N2), which proved a decrease in blood flow in the working muscles during sympatholysis against the background of cold. Analysis of this mechanism in double inverse Lineuwer-Burk coordinates revealed an increase in the number of active a-ARs (by 1.407 times or 40.7%) to Pm=312.5 mmHg during sympatholysis after cold with Pm=222 mmHg during sympatholysis without cold. At the same time, after cold (N4) during sympatholysis, the sensitivity (1/Km) of alpha-adrenoreceptors to epinephrine increased by 1.632 times (by 63.2%) to 1/Km=0.08 from the value of 1/Km=0.049 during sympatholysis without cold (N2). Complete leveling of sympatholysis after cold with 30 μg/kg epinephrine confirms the critical role of dose-dependent pharmacokinetics of arterial tone regulation under cold stress conditions.
CONCLUSION: Conclusion. The obtained data allow us to draw the following conclusion: sympatholysis against the background of 5 days of cold persists, but was less than sympatholysis without cold. Increased adrenergic vasoconstriction after 5 days of cold optimizes heat conservation, but reduces blood flow in the working muscles, which limits physical performance. The discovered mechanisms explain the phenomenon of "early cold asthenia" in individuals with short-term arctic exposure, characterized by a decrease in tolerance to physical activity while maintaining basic hemodynamic homeostasis.
作者简介
Vladimir N. Ananev
Institute of Biomedical Problems of the Russian Academy of Sciences
编辑信件的主要联系方式.
Email: noradrenalin1952@mail.ru
ORCID iD: 0000-0002-4679-6441
SPIN 代码: 1718-8446
MD, Dr. Sci. (Medicine), Professor
俄罗斯联邦, MoscowGeorgy V. Ananev
Pharmstandard JSC
Email: gvananiev@pharmstd.ru
ORCID iD: 0009-0005-4287-8430
SPIN 代码: 4845-8340
俄罗斯联邦, Moscow
Vladimir I. Torshin
Peoples’ Friendship University of Russia
Email: vtorshin@mail.ru
ORCID iD: 0000-0002-3950-8296
SPIN 代码: 8602-3159
Dr. Sci. (Biology), Professor
俄罗斯联邦, MoscowOlga V. Ananeva
Tyumen State Medical University
Email: olvasan@mail.ru
ORCID iD: 0000-0002-0672-9164
SPIN 代码: 1239-5484
MD, Dr. Sci. (Medicine), Professor
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