p53 Regulates the Expression of LRP1 and Apoptosis through a Stress Intensity-Dependent MicroRNA Feedback Loop.
p53 Regulates the Expression of LRP1 and Apoptosis through a Stress Intensity-Dependent MicroRNA Feedback Loop.
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DOI:
10.1016/j.celrep.2018.07.010
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发表时间:
2018-08-07
期刊:
影响因子:
8.8
通讯作者:
Zhang Y
中科院分区:
文献类型:
--
作者:
Leslie PL;Franklin DA;Liu Y;Zhang Y
Understanding how p53 activates certain gene programs and not others is critical. Here, we identify low-density lipoprotein receptor-related protein 1 (LRP1), a transmembrane endocytic receptor, as a p53 target gene. We show that, although LRP1 transcript expression is upregulated in response to both sub-lethal and lethal doses of p53-activating stress, LRP1 protein is only upregulated in response to sub-lethal stress. Interestingly, lethal doses of p53-activating stress inhibit LRP1 de novo translation through an miRNA-based translational repression mechanism. We show that the p53-regulated miRNAs miR-103 and miR-107 are significantly upregulated by lethal doses of stress, resulting in suppression of LRP1 translation and cell death. Our results define a negative feedback loop involving the p53-regulated coding gene LRP1 and p53-regulated miRNA genes. These findings provide mechanistic insight into the selective expression of p53 target genes in response to different stress intensities to elicit either cell survival or cell death. Leslie et al. uncover a p53-dependent feedback loop whereby p53-regulated protein-coding genes are inhibited by p53-regulated microRNAs in a stress intensity-dependent manner, resulting in increased cell death. The findings provide insight into how p53 controls the expression of its target genes to induce a pro-survival or pro-death response to stress.
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