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
Lal A
中科院分区:
生物学1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

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基础p53水平在正常情况下受到严格抑制。破坏这一调控导致p53水平升高,从而诱导细胞周期阻滞、细胞凋亡和肿瘤抑制。在这里,我们报告了一个核的p53调控的长链非编码RNA对基础p53水平的抑制,我们称之为PURPL (p53上调p53水平的调节剂)。结肠直肠癌细胞中PURPL的靶向消耗导致p53基础水平升高,并在细胞培养和小鼠异种移植物中诱导生长缺陷。PURPL与MYBBP1A结合,MYBBP1A是一种结合并稳定p53的蛋白质,并抑制p53-MYBBP1A复合物的形成。在PURPL缺失的情况下,MYBBP1A与p53相互作用并稳定p53。沉默MYBBP1A可显著恢复p53基础水平和PURPL缺陷细胞的增殖,提示MYBBP1A介导PURPL调节p53的作用。这些结果揭示了p53-PURPL的自动调节反馈回路,并证明了PURPL在维持p53基础水平中的作用。为了使细胞分裂,肿瘤抑制蛋白p53必须保持在低水平。Li等人发现,长链非编码RNA PURPL通过保持低p53水平使癌细胞分裂。PURPL结合p53调节因子MYBBP1A抑制p53水平,促进细胞增殖。
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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