1. Involvement of nucleostemin
in the p53-mediated regulatory
pathway
in cellular senescence
骨髄由来の間葉系幹細胞で
高発現している
ヌクレオステミンの機能
2. Nucleostemin
Nucleostemin is expressed in nucleoli of CNS stem cells,
mbryonic stem cells and several cancer cells.
Nucleostemin expression decreases rapidly prior to
neuronal differentiation of CNS stem cells.
he N-terminal basic domain specifies the p53 interaction
nd growth regulatory functions.
3. Human nucleostemin
C23 NS merge
epitope1 epitope2
1 549
B CC G4 G1 A
NLS
2
KRPK
5 42 46
KKPRK
86 89
NoLS of p14ARF: RRPR H10-8 H1299 U2OS
B: basic domain
CC: coiled-coil domain
G4: GTP-binding motif MRC5 Hacat U2OS
G1: GTP-binding motif
A: acidic domain
NLS: nuclear localization signal
5. Expression of nucleostemin
in senescent marrow stromal cells
100
Y S Y S
80 NS NS
60 p53 p53
PD
40
mdm2 mdm2
20
p21 p21
actin GAPDH
0
0 100 200 300
day
SA-βgal SA-βgal young senescent
NS NS
young
X100 X40 X200
senescent
X100 X40 X200
6. Introduction of nucleostemin into
late-passage marrow stromal cells
70
BrdU-positive cell (%)
BrdU 60
P=0.0053
50
p53
40
30
actin
20
10
X40
S
FP
dN
dG
0
A
AdNS
A
S
FP
dN
dG
A
A