Abstract
Gravitational unloading leads to a slow-to-fast shift in the myosin phenotype. The reason for these changes is a decrease in the expression of the genes encoding heavy chains of myosin (MyHC) of the slow type, and an increase in the expression of the genes encoding MyHC of the fast types. Signal cascades such as calcineurin/NFAT and HDAC4/MEF-2D are known to regulate MyHC I gene expression. There is almost no data in the literature on the content of transcription factors NFATc1 and MEF-2D involved in the regulation of the gene expression of MyHC I, as well as histone deacetylase HDAC4 and MAP kinase ERK2 in the rat soleus muscle under the gravitational unloading. The aim of this study was to explore the role of various mechanisms controlling the expression of MyHC type I at each stage of gravitational unloading. The levels of proteins MEF-2D and ERK2 in the nuclear fraction were decreased significantly after 3 and 7 days of unloading, and the level of NFATc1 was decreased on the first and seventh days. However, the content of NFATc1, HDAC4, MEF-2D and ERK2 in the nuclear fraction after 14 days of gravitational unloading corresponded to the control level. These data indicate that the content of transcriptional regulators in the muscle nuclei at a late stage of gravitational unloading is not a limiting factor for maintaining their transcriptional activity.
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ACKNOWLEDGMENTS
The work was supported by the Russian Science Foundation (project no. 18-15-00107).
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All procedures with animals were approved by the Commission on Biomedical Ethics of the SSC RF-IBP RAS, and with the rules and requirements set out in the European Communities Council Directive 1986 (86/609/EEC) and Guide for the Care and Use of Laboratory Animals.
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Translated by E. Puchkov
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Paramonova, I.I., Sharlo, K.A., Vilchinskaya, N.A. et al. The Time Course of Muscle Nuclear Content of Transcription Factors Regulating the MyHC I(β) Expression in the Rat Soleus Muscle under Gravitational Unloading. Biochem. Moscow Suppl. Ser. A 14, 242–248 (2020). https://doi.org/10.1134/S1990747820020099
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DOI: https://doi.org/10.1134/S1990747820020099