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• W3203574791 abstract "Abstract It is well established that microgravity exposure causes significant muscle weakness and atrophy via muscle unloading. On Earth, muscle unloading leads to a disproportionate loss in muscle force and size with the loss in muscle force occurring at a faster rate. Though the exact mechanisms are unknown, a role for Ca 2+ dysregulation has been suggested. The sarco(endo)plasmic reticulum Ca 2+ ATPase (SERCA) pump actively brings cytosolic Ca 2+ into the SR, eliciting muscle relaxation and maintaining low intracellular Ca 2+ ([Ca 2+ ] i ). SERCA dysfunction contributes to elevations in [Ca 2+ ] i , leading to cellular damage and thus may contribute to the muscle weakness and atrophy observed with spaceflight. Here, we investigated SERCA function, SERCA regulatory protein content (sarcolipin, phospholamban, and neuronatin), and reactive oxygen/nitrogen species (RONS) protein adduction in murine skeletal muscle after 35-37 days of spaceflight. In male and female soleus muscles, spaceflight led to drastic impairments in Ca 2+ uptake despite significant increases in SERCA1a protein content. We attribute this impairment to an increase in RONS production and elevated total protein tyrosine (T) nitration and cysteine (S) nitrosylation. Contrarily, in the tibialis anterior (TA) we observed an enhancement in Ca 2+ uptake, which we attribute to a shift towards a faster muscle fiber type (i.e., increased myosin heavy chain IIb and SERCA1a) without elevated total protein T-nitration and S-nitrosylation. Thus, spaceflight affects SERCA function differently between the soleus and TA. As the soleus is severely affected by spaceflight, future studies should determine whether improving SERCA function in this muscle can mitigate muscle atrophy and weakness." @default.
• W3203574791 created "2021-10-11" @default.
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• W3203574791 date "2021-09-27" @default.
• W3203574791 modified "2023-10-14" @default.
• W3203574791 title "Characterizing SERCA function in murine skeletal muscles after 35-37 days of spaceflight" @default.
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• W3203574791 doi "https://doi.org/10.1101/2021.09.27.462048" @default.
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