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      Rbfox-Splicing Factors Maintain Skeletal Muscle Mass by Regulating Calpain3 and Proteostasis

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      Cell Reports

      Elsevier BV

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          Abstract

          <p id="P1">Maintenance of skeletal muscle mass requires a dynamic balance between protein synthesis and tightly controlled protein degradation by the calpain, auto-phagy-lysosome, and ubiquitin-proteasome systems (proteostasis). Several sensing and gene-regulatory mechanisms act together to maintain this balance in response to changing conditions. Here, we show that deletion of the highly conserved Rbfox1 and Rbfox2 alternative splicing regulators in adult mouse skeletal muscle causes rapid, severe loss of muscle mass. Rbfox deletion did not cause a reduction in global protein synthesis, but it led to altered splicing of hundreds of gene transcripts, including capn3, which produced an active form of calpain3 protease. Rbfox knockout also led to a reduction in autophagy flux, likely producing a compensatory increase in general protein degradation by the proteasome. Our results indicate that the Rbfox-splicing factors are essential for the maintenance of skeletal muscle mass and proteostasis. </p><p id="P2"> <div class="figure-container so-text-align-c"> <img alt="" class="figure" src="/document_file/e36cf261-bdc3-4da0-be9b-74962d98989f/PubMedCentral/image/nihms-981691-f0001.jpg"/> </div> </p><p id="P3">Rbfox-splicing factors are highly conserved and expressed in brain, heart, and skeletal muscle. Singh et al. show that Rbfox proteins are essential for the maintenance of muscle mass and proteostasis, as Rbfox double knockout causes increased calpain and proteasome activity and reduced autophagy flux. </p>

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          Author and article information

          Journal
          Cell Reports
          Cell Reports
          Elsevier BV
          22111247
          July 2018
          July 2018
          : 24
          : 1
          : 197-208
          Article
          10.1016/j.celrep.2018.06.017
          6070147
          29972780
          © 2018

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