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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2015 ; 208
(6
): 671-81
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The nucleoporin gp210/Nup210 controls muscle differentiation by regulating
nuclear envelope/ER homeostasis
#MMPMID25778917
Gomez-Cavazos JS
; Hetzer MW
J Cell Biol
2015[Mar]; 208
(6
): 671-81
PMID25778917
show ga
Previously, we identified the nucleoporin gp210/Nup210 as a critical regulator of
muscle and neuronal differentiation, but how this nucleoporin exerts its function
and whether it modulates nuclear pore complex (NPC) activity remain unknown.
Here, we show that gp210/Nup210 mediates muscle cell differentiation in vitro via
its conserved N-terminal domain that extends into the perinuclear space. Removal
of the C-terminal domain, which partially mislocalizes gp210/Nup210 away from
NPCs, efficiently rescues the differentiation defect caused by the knockdown of
endogenous gp210/Nup210. Unexpectedly, a gp210/Nup210 mutant lacking the
NPC-targeting transmembrane and C-terminal domains is sufficient for C2C12
myoblast differentiation. We demonstrate that the endoplasmic reticulum (ER)
stress-specific caspase cascade is exacerbated during Nup210 depletion and that
blocking ER stress-mediated apoptosis rescues differentiation of Nup210-deficient
cells. Our results suggest that the role of gp210/Nup210 in cell differentiation
is mediated by its large luminal domain, which can act independently of NPC
association and appears to play a pivotal role in the maintenance of nuclear
envelope/ER homeostasis.