Abstract
The mechanism of endoplasmic reticulum (ER)–Golgi complex (GC) traffic is conserved from yeast to higher animals, but the architectures and the dynamics of vesicles’ traffic between ER and GC vary across cell types and species. Skeletal muscle is a unique tissue in which ER and GC undergo a structural reorganization during differentiation that completely remodels the secretory pathway. In mature skeletal muscle, the ER is turned into sarcoplasmic reticulum, which is composed of junctional and longitudinal regions specialized, respectively, in calcium release and uptake during contraction. During skeletal muscle differentiation, GC acquires a particular fragmented organization as it appears as spots both at the nuclear poles and along the fibers. The ubiquitary-expressed Yip1A isoform has been proposed to be involved in anterograde trafficking from the ER exit sites to the cis-side of the GC and in ER and GC architecture organization. We investigated the role of Yip1 in skeletal muscle. Here we report that, following skeletal muscle development, the expression of the Yip1A decreases and is replaced by the muscle-specific Yip1B isoform. Confocal microscope analysis revealed that in adult skeletal muscle the Yip1B isoform is localized in the ER–Golgi intermediate and cis-Golgi compartments. Finally, skeletal muscle knockdown experiments in vitro and in vivo suggested that Yip1B is not involved in GC structure maintenance.
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This work was supported by Telethon Grant GGP13213 to VS. We thank Dr Jaakko Saraste for providing the anti-P58 antibody.
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Virginia Barone and Elisa Mazzoli have contributed equally to this work.
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Barone, V., Mazzoli, E., Kunic, J. et al. Yip1B isoform is localized at ER–Golgi intermediate and cis-Golgi compartments and is not required for maintenance of the Golgi structure in skeletal muscle. Histochem Cell Biol 143, 235–243 (2015). https://doi.org/10.1007/s00418-014-1277-z
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DOI: https://doi.org/10.1007/s00418-014-1277-z