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Reduced expression of MyHC slow isoform in rat soleus during unloading is accompanied by alterations of endogenous inhibitors of calcineurin/NFAT signaling pathway

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An Erratum to this article was published on 07 December 2015

Abstract

Under muscle disuse conditions decrease of expression of MyHC of slow type, and sometimes of type IIa, as well as upregulation of expression of IIb and IId/x isoforms were observed. Through dephosphorylation and entry of NFAT molecules to the nucleus calcineurin/NFATc1 signaling pathway promotes upregulation of the slow MyHC expression. We supposed that downregulation of calcineurin pathway took place during unloading. The study was aimed to analyze the states of the myonuclear NFAT inhibitors calsarcin I (CSI) and calsarcin II (CSII) (also referred to as myozenin II and I) and GSK3β in rat soleus during hindlimb suspension (HS). Male Wistar rats were subjected to 3, 7 and 14 day of HS. We found that after 3 days of HS the content of CSII mRNA twofold increased in soleus as compared to the controls. This level was increased by more than fivefold (as compared to control) after 2 weeks of HS. The increase of CSII mRNA expression may be explained as the mechanism of stabilization of fast phenotype. We found that from the 3 day till 14 day of HS the content of MuRF-1 and MuRF-2 in the nuclear fraction fourfold to fivefold increased in HS soleus. We supposed that nuclear import of the MuRFs allows to promote CSII expression during unloading. We also observed the decline of the phosphorylated GSK3β content in the nuclear extract of the soleus tissue. Thus decline of slow MyHC expression characteristic for the unloading conditions is accompanied with the increased expression and activation of the factors known to prevent NFAT accumulation in the myonuclei.

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Acknowledgments

The authors would like to express their sincere gratitude to Dr. Siegfried Labeit (Mannheim, Germany) for generously sharing antibodies against MuRF-1 and MuRF-2. We would also like to extend our thanks to Anton Pokusaev and Alexandra Minailova who helped us with processing the biosamples. The work was supported by a Russian Science Foundation Grant No. 14-15-00358.

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Correspondence to Boris S. Shenkman.

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Lomonosova, Y.N., Turtikova, O.V. & Shenkman, B.S. Reduced expression of MyHC slow isoform in rat soleus during unloading is accompanied by alterations of endogenous inhibitors of calcineurin/NFAT signaling pathway. J Muscle Res Cell Motil 37, 7–16 (2016). https://doi.org/10.1007/s10974-015-9428-y

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  • DOI: https://doi.org/10.1007/s10974-015-9428-y

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