The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading
Skeletal muscle abnormalities and atrophy during unloading are accompanied by the accumulation of excess calcium in the sarcoplasm. We hypothesized that calcium accumulation may occur, among other mechanisms, due to the inhibition of sarco/endoplasmic reticulum Ca<sup>2+</sup>-ATPase (SE...
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MDPI AG
2023-09-01
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| author | Kristina A. Sharlo Irina D. Lvova Sergey A. Tyganov Ksenia A. Zaripova Svetlana P. Belova Tatiana Y. Kostrominova Boris S. Shenkman Tatiana L. Nemirovskaya |
| author_facet | Kristina A. Sharlo Irina D. Lvova Sergey A. Tyganov Ksenia A. Zaripova Svetlana P. Belova Tatiana Y. Kostrominova Boris S. Shenkman Tatiana L. Nemirovskaya |
| author_sort | Kristina A. Sharlo |
| collection | DOAJ |
| description | Skeletal muscle abnormalities and atrophy during unloading are accompanied by the accumulation of excess calcium in the sarcoplasm. We hypothesized that calcium accumulation may occur, among other mechanisms, due to the inhibition of sarco/endoplasmic reticulum Ca<sup>2+</sup>-ATPase (SERCA) activity. Consequently, the use of the SERCA activator will reduce the level of calcium in the sarcoplasm and prevent the negative consequences of muscle unloading. Wistar rats were randomly assigned into one of three groups (eight rats per group): control rats with placebo (C), 7 days of unloading/hindlimb suspension with placebo (7HS), and 7 days of unloading treated with SERCA activator CDN1163 (7HSC). After seven days of unloading the soleus muscle, the 7HS group displayed increased fatigue in the ex vivo test, a significant increase in the level of calcium-dependent CaMK II phosphorylation and the level of tropomyosin oxidation, as well as a decrease in the content of mitochondrial DNA and protein, slow-type myosin mRNA, and the percentage of slow-type muscle fibers. All of these changes were prevented in the 7HSC group. Moreover, treatment with CDN1163 blocked a decrease in the phosphorylation of p70S6k, an increase in eEF2 phosphorylation, and an increase in MuRF-1 mRNA expression. Nevertheless, there were no differences in the degree of fast and slow muscle fiber atrophy between the 7HS and 7HSC groups. Conclusion: SERCA activation during 7 days of unloading prevented an increase in soleus fatigue, the decrease of slow-type myosin, mitochondrial markers, and markers of calcium homeostasis but had no effect on muscle atrophy. |
| first_indexed | 2024-03-10T22:59:26Z |
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| last_indexed | 2024-03-10T22:59:26Z |
| publishDate | 2023-09-01 |
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| series | Biomolecules |
| spelling | doaj.art-83c62eaa9271412c94f8a1a79dbb052a2023-11-19T09:45:50ZengMDPI AGBiomolecules2218-273X2023-09-01139135410.3390/biom13091354The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of UnloadingKristina A. Sharlo0Irina D. Lvova1Sergey A. Tyganov2Ksenia A. Zaripova3Svetlana P. Belova4Tatiana Y. Kostrominova5Boris S. Shenkman6Tatiana L. Nemirovskaya7Myology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaMyology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaMyology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaMyology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaMyology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaDepartment of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine-Northwest, Gary, IN 46202, USAMyology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaMyology Laboratory, Institute of Biomedical Problems, RAS (Russian Academy of Sciences), Moscow 123007, RussiaSkeletal muscle abnormalities and atrophy during unloading are accompanied by the accumulation of excess calcium in the sarcoplasm. We hypothesized that calcium accumulation may occur, among other mechanisms, due to the inhibition of sarco/endoplasmic reticulum Ca<sup>2+</sup>-ATPase (SERCA) activity. Consequently, the use of the SERCA activator will reduce the level of calcium in the sarcoplasm and prevent the negative consequences of muscle unloading. Wistar rats were randomly assigned into one of three groups (eight rats per group): control rats with placebo (C), 7 days of unloading/hindlimb suspension with placebo (7HS), and 7 days of unloading treated with SERCA activator CDN1163 (7HSC). After seven days of unloading the soleus muscle, the 7HS group displayed increased fatigue in the ex vivo test, a significant increase in the level of calcium-dependent CaMK II phosphorylation and the level of tropomyosin oxidation, as well as a decrease in the content of mitochondrial DNA and protein, slow-type myosin mRNA, and the percentage of slow-type muscle fibers. All of these changes were prevented in the 7HSC group. Moreover, treatment with CDN1163 blocked a decrease in the phosphorylation of p70S6k, an increase in eEF2 phosphorylation, and an increase in MuRF-1 mRNA expression. Nevertheless, there were no differences in the degree of fast and slow muscle fiber atrophy between the 7HS and 7HSC groups. Conclusion: SERCA activation during 7 days of unloading prevented an increase in soleus fatigue, the decrease of slow-type myosin, mitochondrial markers, and markers of calcium homeostasis but had no effect on muscle atrophy.https://www.mdpi.com/2218-273X/13/9/1354soleus muscle unloadingmuscle atrophyATPAMPKMuRF1MAFbx |
| spellingShingle | Kristina A. Sharlo Irina D. Lvova Sergey A. Tyganov Ksenia A. Zaripova Svetlana P. Belova Tatiana Y. Kostrominova Boris S. Shenkman Tatiana L. Nemirovskaya The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading Biomolecules soleus muscle unloading muscle atrophy ATP AMPK MuRF1 MAFbx |
| title | The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading |
| title_full | The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading |
| title_fullStr | The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading |
| title_full_unstemmed | The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading |
| title_short | The Effect of SERCA Activation on Functional Characteristics and Signaling of Rat Soleus Muscle upon 7 Days of Unloading |
| title_sort | effect of serca activation on functional characteristics and signaling of rat soleus muscle upon 7 days of unloading |
| topic | soleus muscle unloading muscle atrophy ATP AMPK MuRF1 MAFbx |
| url | https://www.mdpi.com/2218-273X/13/9/1354 |
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