Long Noncoding RNA PURPL Suppresses Basal p53 Levels and Promotes Tumorigenicity in Colorectal Cancer.
Long Noncoding RNA PURPL Suppresses Basal p53 Levels and Promotes Tumorigenicity in Colorectal Cancer.
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长期非编码RNA PURPL抑制基础p53水平并促进大肠癌中的肿瘤性。
DOI:
10.1016/j.celrep.2017.08.041
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发表时间:
2017-09-05
期刊:
影响因子:
8.8
通讯作者:
Lal A
中科院分区:
文献类型:
--
作者:
Li XL;Subramanian M;Jones MF;Chaudhary R;Singh DK;Zong X;Gryder B;Sindri S;Mo M;Schetter A;Wen X;Parvathaneni S;Kazandjian D;Jenkins LM;Tang W;Elloumi F;Martindale JL;Huarte M;Zhu Y;Robles AI;Frier SM;Rigo F;Cam M;Ambs S;Sharma S;Harris CC;Dasso M;Prasanth KV;Lal A
Basal p53 levels are tightly suppressed under normal conditions. Disrupting this regulation results in elevated p53 levels to induce cell cycle arrest, apoptosis and tumor suppression. Here, we report the suppression of basal p53 levels by a nuclear, p53-regulated long noncoding RNA that we termed PURPL (p53 upregulated regulator of p53 levels). Targeted depletion of PURPL in colorectal cancer cells results in elevated basal p53 levels and induces growth defects in cell culture and in mouse xenografts. PURPL associates with MYBBP1A, a protein that binds to and stabilizes p53, and inhibits the formation of the p53-MYBBP1A complex. In the absence of PURPL, MYBBP1A interacts with and stabilizes p53. Silencing MYBBP1A significantly rescues basal p53 levels and proliferation in PURPL-deficient cells, suggesting that MYBBP1A mediates the effect of PURPL in regulating p53. These results reveal a p53-PURPL autoregulatory feedback loop and demonstrate a role for PURPL in maintaining basal p53 levels. For a cell to divide, the tumor suppressor protein p53 must be kept at low levels. Li et al. find that a long noncoding RNA PURPL allows cancer cells to divide by keeping p53 levels low. PURPL binds to the p53-regulator MYBBP1A to suppress p53 levels and facilitate cell proliferation.
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影响因子:
64.5
作者:
Huarte M;Guttman M;Feldser D;Garber M;Koziol MJ;Kenzelmann-Broz D;Khalil AM;Zuk O;Amit I;Rabani M;Attardi LD;Regev A;Lander ES;Jacks T;Rinn JL
通讯作者:
Rinn JL
影响因子:
64.8
作者:
通讯作者:
--
影响因子:
64.5
作者:
ELDEIRY, WS;TOKINO, T;VOGELSTEIN, B
通讯作者:
VOGELSTEIN, B
影响因子:
56.9
作者:
Bunz, F;Dutriaux, A;Vogelstein, B
通讯作者:
Vogelstein, B
影响因子:
10.5
作者:
Dey BK;Pfeifer K;Dutta A
通讯作者:
Dutta A