Dataset Information

RNA-binding protein NONO promotes breast cancer proliferation by post-transcriptional regulation of SKP2 and E2F8.

ABSTRACT: The majority of breast cancers are primarily hormone-sensitive and can be managed by endocrine therapy, although therapy-resistant or hormone-refractory cancers need alternative treatments. Recently, increasing attention is being paid to RNA-binding proteins (RBP) in cancer pathophysiology. The precise role of RBP in breast cancer, however, remains to be clarified. We herein show that an RBP non-POU domain-containing octamer binding (NONO) plays a critical role in the pathophysiology of breast cancers regardless of their hormone dependency. Clinicopathological and immunohistochemical study of 127 breast cancer cases showed that NONO is a significant independent prognostic factor for breast cancer patients. Notably, siRNA-mediated NONO knockdown substantially repressed the proliferation of both hormone-sensitive MCF-7 and hormone-refractory MB-MDA-231 breast cancer cells. Integrative analysis combined with expression microarray and RIP-sequencing (RNA immunoprecipitation-sequencing) showed that NONO post-transcriptionally regulates the expression of cell proliferation-related genes by binding to their mRNAs, as exemplified by S-phase-associated kinase 2 and E2F transcription factor 8. Overall, these results suggest that NONO is a key regulator for breast cancer proliferation through the pre-mRNA splicing of cell proliferation-related genes and could be a potential new diagnostic and therapeutic target for advanced disease.

SUBMITTER: Iino K

PROVIDER: S-EPMC6942431 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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RNA-binding protein NONO promotes breast cancer proliferation by post-transcriptional regulation of SKP2 and E2F8.

Iino Kaori K Mitobe Yuichi Y Ikeda Kazuhiro K Takayama Ken-Ichi KI Suzuki Takashi T Kawabata Hidetaka H Suzuki Yutaka Y Horie-Inoue Kuniko K Inoue Satoshi S

Cancer science 20191211 1

The majority of breast cancers are primarily hormone-sensitive and can be managed by endocrine therapy, although therapy-resistant or hormone-refractory cancers need alternative treatments. Recently, increasing attention is being paid to RNA-binding proteins (RBP) in cancer pathophysiology. The precise role of RBP in breast cancer, however, remains to be clarified. We herein show that an RBP non-POU domain-containing octamer binding (NONO) plays a critical role in the pathophysiology of breast c ...[more]

PMID: 31733123

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Project description:The human ZFP36 zinc finger protein family consists of ZFP36, ZFP36L1, and ZFP36L2. These proteins regulate various cellular processes, including cell apoptosis, by binding to adenine uridine rich elements in the 3' untranslated regions of sets of target mRNAs to promote their degradation. The pro-apoptotic and other functions of ZFP36 family members have been implicated in the pathogenesis of lymphoid malignancies. To identify candidate mRNAs that are targeted in the pro-apoptotic response by ZFP36L1, we reverse-engineered a gene regulatory network for all three ZFP36 family members using the 'maximum information coefficient' (MIC) for target gene inference on a large microarray gene expression dataset representing cells of diverse histological origin. Of the three inferred ZFP36L1 mRNA targets that were identified, we focussed on experimental validation of mRNA for the pro-survival protein, BCL2, as a target for ZFP36L1. RNA electrophoretic mobility shift assay experiments revealed that ZFP36L1 interacted with the BCL2 adenine uridine rich element. In murine BCL1 leukemia cells stably transduced with a ZFP36L1 ShRNA lentiviral construct, BCL2 mRNA degradation was significantly delayed compared to control lentiviral expressing cells and ZFP36L1 knockdown in different cell types (BCL1, ACHN, Ramos), resulted in increased levels of BCL2 mRNA levels compared to control cells. 3' untranslated region luciferase reporter assays in HEK293T cells showed that wild type but not zinc finger mutant ZFP36L1 protein was able to downregulate a BCL2 construct containing the BCL2 adenine uridine rich element and removal of the adenine uridine rich core from the BCL2 3' untranslated region in the reporter construct significantly reduced the ability of ZFP36L1 to mediate this effect. Taken together, our data are consistent with ZFP36L1 interacting with and mediating degradation of BCL2 mRNA as an important target through which ZFP36L1 mediates its pro-apoptotic effects in malignant B-cells.

Dataset Information

RNA-binding protein NONO promotes breast cancer proliferation by post-transcriptional regulation of SKP2 and E2F8.

Publications

RNA-binding protein NONO promotes breast cancer proliferation by post-transcriptional regulation of SKP2 and E2F8.

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