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Expression of Muscle-Specific Ribosomal Protein L3-Like Impairs Myotube Growth
Center for Muscle Biology, University of Kentucky, Lexington KY, USA; Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky. (MIPA)ORCID-id: 0000-0002-5322-4150
Center for Muscle Biology, University of Kentucky, Lexington KY,USA; Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky.
Center for Muscle Biology, University of Kentucky, Lexington, Kentucky; Department of Physiology, College of Medicine, University of Kentucky, Lexington, Kentucky.
2016 (engelsk)Inngår i: Journal of Cellular Physiology, ISSN 0021-9541, E-ISSN 1097-4652, Vol. 231, nr 9, s. 1894-1902Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The ribosome has historically been considered to have no cell-specific function but rather serve in a "housekeeping" capacity. This view is being challenged by evidence showing that heterogeneity in the protein composition of the ribosome can lead to the functional specialization of the ribosome. Expression profiling of different tissues revealed that ribosomal protein large 3-like (Rpl3l) is exclusively expressed in striated muscle. In response to a hypertrophic stimulus, Rpl3l expression in skeletal muscle was significantly decreased by 82% whereas expression of the ubiquitous paralog Rpl3 was significantly increased by ∼fivefold. Based on these findings, we developed the hypothesis that Rpl3l functions as a negative regulator of muscle growth. To test this hypothesis, we used the Tet-On system to express Rpl3l in myoblasts during myotube formation. In support of our hypothesis, RPL3L expression significantly impaired myotube growth as assessed by myotube diameter (-23%) and protein content (-14%). Further analysis showed that the basis of this impairment was caused by a significant decrease in myoblast fusion as the fusion index was significantly lower (-17%) with RPL3L expression. These findings are the first evidence to support the novel concept of ribosome specialization in skeletal muscle and its role in the regulation of skeletal muscle growth.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2016. Vol. 231, nr 9, s. 1894-1902
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URN: urn:nbn:se:oru:diva-55281DOI: 10.1002/jcp.25294ISI: 000379159100006PubMedID: 26684695Scopus ID: 2-s2.0-84954348847OAI: oai:DiVA.org:oru-55281DiVA, id: diva2:1071036
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Funding Agency:

NIH AR061939  AR064896

Tilgjengelig fra: 2017-02-02 Laget: 2017-02-02 Sist oppdatert: 2018-09-06bibliografisk kontrollert

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