Key result
In a mouse skeletal muscle cell line, IL-15RA regulates the localization and expression of IL-15 at the protein level during myotube differentiation.
Why the study?
The dynamics of interleukin-15 and its receptors, which regulate the IL-15 pathway during skeletal muscle differentiation, had not yet been clarified.
IL-15RA regulates the protein kinetics and localization of IL-15 signaling during skeletal muscle differentiation.
Cell-line data warrant no clinical changes in muscle disorders; leaves open IL-15RA's role in human myogenesis.
NEW FINDINGS: What is the central question of this study? How are the dynamics of interleukin (IL)-15 and its receptors altered during the differentiation of myoblasts into myotubes, and how is IL-15 regulated? What is the main finding and its importance? The mRNA levels of IL-15 and interleukin-2 receptor subunits beta and gamma increase during skeletal muscle differentiation, whereas interleukin-15 receptor subunit alpha (IL-15RA) exhibits different kinetics. IL-15RA regulates the localization and expression of IL-15 at the protein level. ABSTRACT: Interleukin-15 (IL-15) is a myokine in the interleukin-2 (IL-2) family that is generated in the skeletal muscle during exercise. The functional effect of IL-15 involves muscle regeneration and metabolic regulation in skeletal muscle. Reports have indicated that interleukin-15 receptor subunit alpha (IL-15RA) acts by regulating IL-15 localization in immune cells. However, the dynamics of IL-15 and its receptors, which regulate the IL-15 pathway in skeletal muscle differentiation, have not yet been clarified. In this study, we investigated the mechanism of IL-15 regulation using a mouse skeletal muscle cell line, C2C12 cells. We found that the mRNA expression of IL-15, interleukin-2 receptor subunit beta (IL-2RB; CD122) and interleukin-2 receptor subunit gamma (IL-2RG; CD132) increased, but that IL-15RA exhibited different kinetics as differentiation progressed. We also found that IL-15, mainly present in the cytosol, pre-assembled with IL-15RA in the cytosol and fused to the plasma membrane. Moreover, IL-15RA increased IL-15 protein levels. Our findings suggest that genes involved in the IL-15 signalling complex are enhanced with the differentiation of myotubes and that IL-15RA regulates the protein kinetics of IL-15 signalling in skeletal muscle.
No takes yet. Share an insight, caveat, or question.
A 2022 study studied Skeletal muscle differentiation. IL-15RA was evaluated on IL-15 localization and protein expression. In a mouse skeletal muscle cell line, IL-15RA regulates the localization and expression of IL-15 at the protein level during myotube differentiation.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: