Impact of сold adaptation on reactivity of muscular arteries to epinephrine in functional sympatholysis
- Authors: Ananev V.N.1, Ananev G.V.2, Torshin V.I.3, Ananeva O.V.4
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Affiliations:
- Institute of Biomedical Problems of the Russian Academy of Sciences
- JSC "Pharmstandard"
- Peoples' Friendship University of Russia
- Tyumen State Medical University
- Issue: Vol 31, No 4 (2024)
- Pages: 303-313
- Section: ORIGINAL STUDY ARTICLES
- URL: https://journal-vniispk.ru/1728-0869/article/view/316998
- DOI: https://doi.org/10.17816/humeco633895
- ID: 316998
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Abstract
Background: Functional sympatholysis is determined as a tenfold increase in blood flow in the muscular arteries following the muscle contraction. This is explained by various mechanisms. However, there are no works on quantitative analysis of the pharmacokinetics and pharmacodynamics of the epinephrine effects on the arterial α-adrenergic receptors in sympatholysis before and during the cold adaptation.
Aim: To study the effect of the 30-day cold adaptation on the adrenal reactivity of muscular arterial vessels to epinephrine in the functional sympatholysis.
Material and methods: The experiments used four groups of rabbits. First group: control ( n =20); second group ( n =15): modelling of the muscle contraction by electrical stimulation in the sympatholysis; third group ( n =15): after 30-day cold adaptation; and fourth group ( n =15): modelling of the muscle contraction by electrical stimulation after 30-day cold adaptation. Adaptation to low temperatures was modeled at the daily 6-hour cooling at 10°C. A unique technique was used: blood was perfused into the limb muscles of all the rabbits via the femoral artery, after ligation of all anastomoses, using a constant flow pump. The adrenal reactivity was analyzed using the “dose-effect” response in double-reversed Lineweaver–Burk plot. This approach allowed determining the maximum pressor (Pm) response, which characterizes the number of active adrenergic receptors and the sensitivity (1/K) of the adrenergic receptors to epinephrine.
Results: The sympatholysis was proved to be present in both the cold-adapted and control rabbits, but to a lesser extent. Sympatholysis reduced the contraction of arteries in response to epinephrine solely due to the mechanisms of the 24.49-fold reduced sensitivity of adrenergic receptors from 1/Km=1.2±6.7 1/μg.kg in the control group to 1/Km = 0.049±0.0016 1/μg.kg in the sympatholysis group ( p <0.05). The number of active adrenergic receptors did not significantly change (Pm=222.0 ±6.7 in the control group, Pm=222.0 ±7.5 in the sympatholysis group). As a process of arterial dilatation, sympatholysis reduced in the rabbits after the cold adaptation due to the increased number of the pressor adrenergic receptors in the cold conditions to Рm=312.5 ±11.0 mm Hg from Pm=222.0 ±7.5 mm Hg in the no-cold sympatholysis ( p <0.05). The sensitivity of adrenergic receptors to epinephrine (1/Km) in the no-cold sympatholysis and in the cold conditions did not significantly change ( p >0.05).
Conclusion: Sympatholysis persists in the cold conditions but to a lesser extent than in the control group. As a stress hormone, epinephrine causes a greater contraction of arteries in the cold-adapted rabbits in sympatholysis than in no-cold conditions, which helps conserving heat in the body in such source of stress as the arctic cold, and improves survival.
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##article.viewOnOriginalSite##About the authors
Vladimir N. Ananev
Institute of Biomedical Problems of the Russian Academy of Sciences
Author for correspondence.
Email: noradrenalin1952@mail.ru
ORCID iD: 0000-0002-4679-6441
SPIN-code: 1718-8446
MD, Dr. Sci. (Medicine), Professor
Russian Federation, 76 Khoroshevskoe Highway, 123007 MoscowGeorgy V. Ananev
JSC "Pharmstandard"
Email: gvananiev@pharmstd.ru
ORCID iD: 0009-0005-4287-8430
SPIN-code: 4845-8340
Russian Federation, Moscow
Vladimir I. Torshin
Peoples' Friendship University of Russia
Email: vtorshin@mail.ru
ORCID iD: 0000-0002-3950-8296
SPIN-code: 8602-3159
Dr. Sci. (Biology), Professor
Russian Federation, MoscowOlga V. Ananeva
Tyumen State Medical University
Email: olvasan@mail.ru
ORCID iD: 0000-0002-0672-9164
SPIN-code: 1239-5484
MD, Dr. Sci. (Medicine), Professor
Russian Federation, TyumenReferences
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