Journal
FEBS JOURNAL
Volume 278, Issue 4, Pages 610-621Publisher
WILEY
DOI: 10.1111/j.1742-4658.2010.07982.x
Keywords
NPC remodeling; nuclear pore complex; nuclear transport; Nup358/RanBP2; skeletal myogenesis
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Takeda Science Foundation
- Grants-in-Aid for Scientific Research [23657130, 21247032] Funding Source: KAKEN
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The nuclear pore complex (NPC) is the only gateway for molecular trafficking across the nuclear envelope. The NPC is not merely a static nuclear-cytoplasmic transport gate; the functional analysis of nucleoporins has revealed dynamic features of the NPC in various cellular functions, such as mitotic spindle formation and protein modification. However, it is not known whether the NPC undergoes dynamic changes during biological processes such as cell differentiation. In the present study, we evaluate changes in the expression levels of several nucleoporins and show that the amount of Nup358/RanBP2 within individual NPCs increases during muscle differentiation in C2C12 cells. Using atomic force microscopy, we demonstrate structural differences between the cytoplasmic surfaces of myoblast and myotube NPCs and a correlation between the copy number of Nup358 and the NPC structure. Furthermore, small interfering RNA-mediated depletion of Nup358 in myoblasts suppresses myotube formation without affecting cell viability, suggesting that NUP358 plays a role in myogenesis. These findings indicate that the NPC undergoes dynamic remodeling during muscle cell differentiation and that Nup358 is prominently involved in the remodeling process.
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