The Effect of Na+, K+-ATPase and Dihydropyridine Receptor Activity on Ca2+ Content and Contractile Properties of M. Soleus in Rats under Three-Day Functional Unloading
- Authors: Nemirovskaya T.L.1, Sharlo K.A.1, Tyganov S.A.1, Sidorenko D.A.1, Bokov R.O.1, Zaripova K.A.1
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Affiliations:
- Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
- Issue: Vol 42, No 5 (2025)
- Pages: 414-420
- Section: ***
- URL: https://journal-vniispk.ru/0233-4755/article/view/353194
- DOI: https://doi.org/10.31857/S0233475525050061
- ID: 353194
Cite item
Abstract
Hypokinesia is characterized by muscle atrophy and decreased strength, which can occur at the earliest stages of unloading. To study the relationship between calcium-dependent processes in the fiber and changes in the contractile properties of m. soleus, a 3-day period of unloading was used in male Wistar rats, which were administered nifedipine, a dihydropyridine receptor (DHPR) blocker, or ouabain, a cardiac glycoside that binds to the α-subunit of Na+,K+-ATPase. In two series of experiments, three groups of rats were used (16 individuals in each group): control (C), suspension (3HS), suspension + nifedipine (3HS + N), or (for the second series) suspension + ouabain (3HS + Ou). A decrease in m. soleus weight was found in all suspension groups (HS, 3HS + N, 3HS + Ou) (p < 0.05). The three-day inhibition of DHPR during functional unloading prevented the decrease in force and the increase in the Ca2+ level in the myoplasm of m. soleus. Administration of nifedipine at early stages of unloading prevents the decrease in the maximum force of single and tetanic contraction of the soleus (in contrast to the group of suspension without the drug, where the decrease occurs by 24 and 29% relative to the control, respectively, p < 0.05). Administration of ouabain led to a decrease (by 22 and 18%, respectively, p < 0.05) in the specific maximum force of single and tetanic contraction of the soleus in animals subjected to suspension (without and with the drug), relative to the intact control. However, the drug significantly affected the passive mechanical properties of m. soleus: the maximum peak force and the maximum force at the end of the stretch test in muscles with ouabain administration did not differ from the intact control group, whereas in the suspended group (3HS) it decreased (by 33 and 34%, respectively, p < 0.05). In summary, the administration of ouabain and nifedipine leads to the prevention of myoplasmic calcium accumulation against the background of hindlimb unloading, which is accompanied by the preservation of specific muscle stiffness and strength, a slowdown in the decrease in the cross-sectional area of muscle fibers, and the prevention of a change in the percentage of fibers towards fast-type fibers.
About the authors
T. L. Nemirovskaya
Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
Email: Nemirovskaya@bk.ru
Moscow, 123007 Russia
K. A. Sharlo
Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
Email: Nemirovskaya@bk.ru
Moscow, 123007 Russia
S. A. Tyganov
Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
Email: Nemirovskaya@bk.ru
Moscow, 123007 Russia
D. A. Sidorenko
Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
Email: Nemirovskaya@bk.ru
Moscow, 123007 Russia
R. O. Bokov
Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
Email: Nemirovskaya@bk.ru
Moscow, 123007 Russia
K. A. Zaripova
Myology Laboratory, Institute of Biomedical Problems (IBP), Russian Academy of Sciences
Author for correspondence.
Email: Nemirovskaya@bk.ru
Moscow, 123007 Russia
References
- Marusic U., Narici M., Simunic B., Pisot R., Ritzmann R. 2021. Nonuniform loss of muscle strength and atrophy during bed rest: a systematic review. J. Appl. Physiol. (1985). 131 (1), 194–206. https://doi.org/10.1152/japplphysiol.00363.2020
- Baldwin K.M., Haddad F. 2002. Skeletal muscle plasticity: Сellular and molecular responses to altered physical activity paradigms. Am. J. Phys. Med. Rehabil. 81, 40–51. https://doi.org/10.1097/01.PHM.0000029723.36419.0D
- Shenkman B.S. 2020. How postural muscle senses disuse? Early signs and signals. Int. J. Mol. Sci. 21 (14), 5037. https://doi.org/10.3390/ijms21145037
- Ingalls C.P., Warren G.L., Armstrong R.B. 1999. Intracellular Ca2+ transients in mouse soleus muscle after hindlimb unloading and reloading. J. Appl. Physiol. 87 (1), 386–390. https://doi.org/10.1152/jappl.1999.87.1.386
- Zaripova K.A., Kalashnikova E.P., Belova S.P., Kostrominova T.Y., Shenkman B.S., Nemirovskaya T.L. 2021. Role of pannexin 1 ATP-permeable channels in the regulation of signaling pathways during skeletal muscle unloading. Int. J. Mol. Sci. 22 (19), 10444. https://doi.org/10.3390/ijms221910444
- Kravtsova V.V., Matchkov V.V., Bouzinova E.V., Vasiliev A.N., Razgovorova I.A., Heiny J.A., Krivoi I.I. 2015. Isoform-specific Na,K-ATPase alterations precede disuse-induced atrophy of rat soleus muscle. Biomed Res Int. 2015, 720172. https://doi.org/10.1155/2015/720172
- Kravtsova V.V., Petrov A.M., Matchkov V.V., Bouzinova E.V., Vasiliev A.N., Benziane B, Zefirov A.L., Chibalin A.V., Heiny J.A., Krivoi I.I. 2016. Distinct alpha2 Na,K-ATPase membrane pools are differently involved in early skeletal muscle remodeling during disuse. J. Gen. Physiol. 147 (2), 175–188. https://doi.org/10.1085/jgp.201511494
- Kravtsova V.V., Bouzinova E.V., Matchkov V.V., Krivoi I.I. 2020. Skeletal muscle Na,K-ATPase as a target for circulating ouabain. Int. J. Mol. Sci. 21 (8), 2875. https://doi.org/10.3390/ijms21082875
- Morey-Holton E.R., Globus R.K. 2002. Hindlimb unloading rodent model: Technical aspects. J. Appl. Physiol. 92 (4), 1367–1377. https://doi.org/10.1152/japplphysiol.00969.2001
- Sharlo K., Lvova I., Turtikova O., Tyganov S., Kalashnikov V., Shenkman B. 2022. Plantar stimulation prevents the decrease in fatigue resistance in rat soleus muscle under one week of hindlimb suspension. Arch Biochem Biophys. 718, 109150. https://doi.org/10.1016/j.abb.2022.109150
- Belova S.P., Lomonosova Y.N., Shenkman B.S., Nemirovskaya T.L. 2015. The blockade of dihydropyridine channels prevents an increase in mu-calpain level under m. soleus unloading. Dokl. Biochem. Biophys. 460, 1–3. https://doi.org/10.1134/S1607672915010019
- Nicogossian A.E., Williams R., Huntoon C.L., Doarn C.R., Poll J.D., Schneider V.S. 2016. Space physiology and medicine: From evidence to practice. Eds. A.E. Nicogossian, R.S. Williams, C.L. Huntoon et al. New York: Springer. 509 p. https://doi.org/10.1007/978-1-4939-6652-3
- Глашев М.М., Разговорова И.А., Михайлова Е. В., Кравцова В.В., Кривой И.И. 2011. Электрофизиологические и сократительные характеристики m. soleus крысы и монгольской песчанки при функциональной разгрузке. Вестник СПбГУ. 4, 73–83.
- Melnikov I.Y., Tyganov S.A., Sharlo K.A., Ulanova A.D., Vikhlyantsev I.M., Mirzoev T.M., Shenkman B.S. 2022. Calpain-dependent degradation of cytoskeletal proteins as a key mechanism for a reduction in intrinsic passive stiffness of unloaded rat postural muscle. Pflugers Arch. 474 (11), 1171–1183. https://doi.org/10.1007/s00424-022-02740-5
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