Abstract
pRb and p53 are two major tumor suppressors. Here, we found that p53 activates expression of Pirh2 and KPC1, two of the three ubiquitin ligases for p27. Loss of p53 in the absence of Skp2, the third ubiquitin ligase for p27, shrinks the cellular pool of p27 ubiquitin ligases to accumulate p27 protein. In the absence of pRb and p53, p27 was unable to inhibit DNA synthesis in spite of its abundance, but could inhibit division of cells that maintain DNA replication with rereplication. This mechanism blocked pRb/p53 doubly deficient pituitary and prostate tumorigenesis lastingly coexistent with bromodeoxyuridine-labeling neoplastic lesions, revealing an unconventional cancer cell vulnerability when pRb and p53 are inactivated.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 645-659 |
| Number of pages | 15 |
| Journal | Cancer Cell |
| Volume | 24 |
| Issue number | 5 |
| DOIs | |
| State | Published - Nov 11 2013 |
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ASJC Scopus subject areas
- Cancer Research
- Cell Biology
- Oncology
Cite this
Skp2 Deletion Unmasks a p27 Safeguard that Blocks Tumorigenesis in the Absence of pRb and p53 Tumor Suppressors. / Zhao, Hongling; Bauzon, Frederick; Fu, Hao; Lu, Zhonglei; Cui, Jinhua; Nakayama, Keiko; Nakayama, Keiich I.; Locker, Joseph; Zhu, Liang.
In: Cancer Cell, Vol. 24, No. 5, 11.11.2013, p. 645-659.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Skp2 Deletion Unmasks a p27 Safeguard that Blocks Tumorigenesis in the Absence of pRb and p53 Tumor Suppressors
AU - Zhao, Hongling
AU - Bauzon, Frederick
AU - Fu, Hao
AU - Lu, Zhonglei
AU - Cui, Jinhua
AU - Nakayama, Keiko
AU - Nakayama, Keiich I.
AU - Locker, Joseph
AU - Zhu, Liang
PY - 2013/11/11
Y1 - 2013/11/11
N2 - pRb and p53 are two major tumor suppressors. Here, we found that p53 activates expression of Pirh2 and KPC1, two of the three ubiquitin ligases for p27. Loss of p53 in the absence of Skp2, the third ubiquitin ligase for p27, shrinks the cellular pool of p27 ubiquitin ligases to accumulate p27 protein. In the absence of pRb and p53, p27 was unable to inhibit DNA synthesis in spite of its abundance, but could inhibit division of cells that maintain DNA replication with rereplication. This mechanism blocked pRb/p53 doubly deficient pituitary and prostate tumorigenesis lastingly coexistent with bromodeoxyuridine-labeling neoplastic lesions, revealing an unconventional cancer cell vulnerability when pRb and p53 are inactivated.
AB - pRb and p53 are two major tumor suppressors. Here, we found that p53 activates expression of Pirh2 and KPC1, two of the three ubiquitin ligases for p27. Loss of p53 in the absence of Skp2, the third ubiquitin ligase for p27, shrinks the cellular pool of p27 ubiquitin ligases to accumulate p27 protein. In the absence of pRb and p53, p27 was unable to inhibit DNA synthesis in spite of its abundance, but could inhibit division of cells that maintain DNA replication with rereplication. This mechanism blocked pRb/p53 doubly deficient pituitary and prostate tumorigenesis lastingly coexistent with bromodeoxyuridine-labeling neoplastic lesions, revealing an unconventional cancer cell vulnerability when pRb and p53 are inactivated.
UR - http://www.scopus.com/inward/record.url?scp=84887560579&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84887560579&partnerID=8YFLogxK
U2 - 10.1016/j.ccr.2013.09.021
DO - 10.1016/j.ccr.2013.09.021
M3 - Article
VL - 24
SP - 645
EP - 659
JO - Cancer Cell
JF - Cancer Cell
SN - 1535-6108
IS - 5
ER -