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2015 ; 5
(ä): 11777
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Cytoplasmic nucleophosmin has elevated T199 phosphorylation upon which G2/M phase
progression is dependent
#MMPMID26123729
Chan N
; Lim TM
Sci Rep
2015[Jun]; 5
(ä): 11777
PMID26123729
show ga
The cytoplasmic mutant of nucleophosmin (NPMc) is found approximately in
one-third of acute myeloid leukemia (AML) cases and is highly associated with
normal karyotype. Whereas previous studies have focused on wtNPM in centrosome
duplication, we further elucidate the role of NPM in the cell cycle by utilizing
the increased cytoplasmic load of NPMc. Overexpression of NPMc causes increased
phosphorylation of NPM on T199 and, to a lesser degree, S4. T199 phosphorylation
is dependent on cdk2 but activators of cdk2 were not elevated. Upon inhibition of
cdk2, NPMc-overexpressing cells demonstrate a greater G2/M phase arrest than
wtNPM or GFP counterparts. However, the number of cells with 2 centrosomes did
not increase concordantly. This suggests that the arrest was caused by a delay in
centrosome duplication, most likely due to the inhibition of centrosome
duplication caused by unphosphorylated NPMc. Overall, these results suggest that
the phosphorylation of T199 is important in the mitotic progression of
NPMc-expressing cells. This further supports the hypothesis that NPMc is
associated with normal karyotypes in AML because the higher cytoplasmic load of
NPM can better suppress centrosome overduplication which would otherwise result
in unequal segregation of chromosomes during mitosis, leading to aneuploidy and
other genomic instabilities.