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We are analyzing https://link.springer.com/article/10.1186/s12943-017-0725-5.

Title:
A novel mechanism of lncRNA and miRNA interaction: CCAT2 regulates miR-145 expression by suppressing its maturation process in colon cancer cells | Molecular Cancer
Description:
Background Although both long and micro RNAs are emerging as important functional components in colorectal cancer (CRC) progression and metastasis, the mechanism of their interaction remains poorly understood. CCAT2 (Colon cancer-associated transcript-2), a long noncoding RNA (lncRNA), has been reported to be over-expressed in CRC and is found to promote tumor growth. miRNAs, a class of naturally occurring short RNAs negatively control the expression of target genes by cleaving mRNA or through translation repression. Recently, we reported that miR-145 and miR-21 cooperate to regulate colon cancer stem cell (CSC) proliferation and differentiation. Considering that CCAT2 is mainly located in the nucleus and miRNA maturation process begins in the nucleus, we hypothesize that CCAT2 selectively blocks miR-145 maturation process, resulting in decreased mature miR-145 affecting colon CSC proliferation and differentiation. Methods The levels of CCAT2 were manipulated by transfection of CCAT2 expression plasmid or knockdown by siRNA or by CRISPR/Cas9. Quantitative RT-PCR was performed to examine the expression of CCAT2 and pri-, pre- and mature miR-145/21. Fluorescence in situ hybridization (FISH) was used to visualize CCAT2 in the cells. In vitro processing of pri-miRNA-145 was performed using T7 RNA polymerase and recombinant human Dicer. Results We have observed that modulated expression of CCAT2 regulates the expression of miR-145 in colon cancer HCT-116 and HT-29 cells. Knockout of CCAT2 increases miR-145 and negatively regulates miR-21 in HCT-116 cells, impairs proliferation and differentiation. In contrast, stable up-regulation of CCAT2 decreases mature miR-145 and increases the expression of several CSC markers in colon cancer cells. We have also observed that CCAT2 is enriched in the nucleus and correlates with the expression of pre-miR-145 but not pre-miR-21 in HCT-116 cells. These results indicate CCAT2 selectively blocks miR-145 maturation by inhibiting pre-miR-145 export to cytoplasm. Further, we revealed that CCAT2 blocks cleavage of pre-miR-145 by Dicer in vitro. Conclusions Our results identify CCAT2 as a negative regulator of miRNA-145 biogenesis, and expose a novel mechanism of lncRNA-miRNA crosstalk.
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28 years and 1 months (reg. 1997-05-29).

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Keywords {🔍}

ccat, cells, cancer, expression, pubmed, article, rna, colon, google, scholar, hct, premir, cas, mirna, cell, dicer, fig, rnas, noncoding, mirnas, primir, central, mature, long, data, nucleus, results, microrna, nuclear, qrtpcr, process, tumor, growth, human, cytoplasmic, overexpressing, lncrna, regulates, vitro, biogenesis, exportin, crht, pcr, reaction, maturation, control, stem, compared, analysis, majumdar,

Topics {✒️}

quantitative real-time rt-pcr real-time quantitative rt-pcr precursor mir-145/146a/146b/15a/1207/10a cell-cycle-regulated gene encodes anti-biotin monoclonal antibody chemo-resistant cr-ht-29 cells article download pdf detecting biotin-labeled ccat2 mir-146a/146b/15a/1207 small multi-faceted rna lung adenocarcinoma-specific long data represent means ± sem enhanced gfp-selectable marker mirna reverse transcription-pcr increased β-catenin activity genome-wide association scan digxigenin labeled pri-mir-145 real time pcr dig-labed pri-mir-145 pcmv/ccat2 plasmid dig-labeled pri-mir-145 tcf7l2-mediated transcriptional regulation lncrna-mirna crosstalk quantitative rt-pcr dig-labeled rnas detected full access wnt signaling pathway cr-ht29/ccat2 + dicer inhibiting pre-mir-145 export denaturing polyacrylamide gel qrt-pcr results show mirna biogenesis process privacy choices/manage cookies mirna biogenesis pathway stem cell growth promotes tumor growth colon cancer stem single- nucleotide polymorphism recombinant dicer reaction qrt-pcr showing recombinant dicer enzyme conserved seed pairing creative commons license cell-type specific recombinant human dicer human cell quiescence 4 mg/ml g418 article yu rna polymerase ii roche molecular biochemicals

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WebPage:
      mainEntity:
         headline:A novel mechanism of lncRNA and miRNA interaction: CCAT2 regulates miR-145 expression by suppressing its maturation process in colon cancer cells
         description:Although both long and micro RNAs are emerging as important functional components in colorectal cancer (CRC) progression and metastasis, the mechanism of their interaction remains poorly understood. CCAT2 (Colon cancer-associated transcript-2), a long noncoding RNA (lncRNA), has been reported to be over-expressed in CRC and is found to promote tumor growth. miRNAs, a class of naturally occurring short RNAs negatively control the expression of target genes by cleaving mRNA or through translation repression. Recently, we reported that miR-145 and miR-21 cooperate to regulate colon cancer stem cell (CSC) proliferation and differentiation. Considering that CCAT2 is mainly located in the nucleus and miRNA maturation process begins in the nucleus, we hypothesize that CCAT2 selectively blocks miR-145 maturation process, resulting in decreased mature miR-145 affecting colon CSC proliferation and differentiation. The levels of CCAT2 were manipulated by transfection of CCAT2 expression plasmid or knockdown by siRNA or by CRISPR/Cas9. Quantitative RT-PCR was performed to examine the expression of CCAT2 and pri-, pre- and mature miR-145/21. Fluorescence in situ hybridization (FISH) was used to visualize CCAT2 in the cells. In vitro processing of pri-miRNA-145 was performed using T7 RNA polymerase and recombinant human Dicer. We have observed that modulated expression of CCAT2 regulates the expression of miR-145 in colon cancer HCT-116 and HT-29 cells. Knockout of CCAT2 increases miR-145 and negatively regulates miR-21 in HCT-116 cells, impairs proliferation and differentiation. In contrast, stable up-regulation of CCAT2 decreases mature miR-145 and increases the expression of several CSC markers in colon cancer cells. We have also observed that CCAT2 is enriched in the nucleus and correlates with the expression of pre-miR-145 but not pre-miR-21 in HCT-116 cells. These results indicate CCAT2 selectively blocks miR-145 maturation by inhibiting pre-miR-145 export to cytoplasm. Further, we revealed that CCAT2 blocks cleavage of pre-miR-145 by Dicer in vitro. Our results identify CCAT2 as a negative regulator of miRNA-145 biogenesis, and expose a novel mechanism of lncRNA-miRNA crosstalk.
         datePublished:2017-09-30T00:00:00Z
         dateModified:2017-09-30T00:00:00Z
         pageStart:1
         pageEnd:11
         license:http://creativecommons.org/publicdomain/zero/1.0/
         sameAs:https://doi.org/10.1186/s12943-017-0725-5
         keywords:
            miRNA biogenesis
            lncRNA-miRNA crosstalk
            cancer stem cells
            Cancer Research
            Oncology
         image:
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                        type:PostalAddress
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ScholarlyArticle:
      headline:A novel mechanism of lncRNA and miRNA interaction: CCAT2 regulates miR-145 expression by suppressing its maturation process in colon cancer cells
      description:Although both long and micro RNAs are emerging as important functional components in colorectal cancer (CRC) progression and metastasis, the mechanism of their interaction remains poorly understood. CCAT2 (Colon cancer-associated transcript-2), a long noncoding RNA (lncRNA), has been reported to be over-expressed in CRC and is found to promote tumor growth. miRNAs, a class of naturally occurring short RNAs negatively control the expression of target genes by cleaving mRNA or through translation repression. Recently, we reported that miR-145 and miR-21 cooperate to regulate colon cancer stem cell (CSC) proliferation and differentiation. Considering that CCAT2 is mainly located in the nucleus and miRNA maturation process begins in the nucleus, we hypothesize that CCAT2 selectively blocks miR-145 maturation process, resulting in decreased mature miR-145 affecting colon CSC proliferation and differentiation. The levels of CCAT2 were manipulated by transfection of CCAT2 expression plasmid or knockdown by siRNA or by CRISPR/Cas9. Quantitative RT-PCR was performed to examine the expression of CCAT2 and pri-, pre- and mature miR-145/21. Fluorescence in situ hybridization (FISH) was used to visualize CCAT2 in the cells. In vitro processing of pri-miRNA-145 was performed using T7 RNA polymerase and recombinant human Dicer. We have observed that modulated expression of CCAT2 regulates the expression of miR-145 in colon cancer HCT-116 and HT-29 cells. Knockout of CCAT2 increases miR-145 and negatively regulates miR-21 in HCT-116 cells, impairs proliferation and differentiation. In contrast, stable up-regulation of CCAT2 decreases mature miR-145 and increases the expression of several CSC markers in colon cancer cells. We have also observed that CCAT2 is enriched in the nucleus and correlates with the expression of pre-miR-145 but not pre-miR-21 in HCT-116 cells. These results indicate CCAT2 selectively blocks miR-145 maturation by inhibiting pre-miR-145 export to cytoplasm. Further, we revealed that CCAT2 blocks cleavage of pre-miR-145 by Dicer in vitro. Our results identify CCAT2 as a negative regulator of miRNA-145 biogenesis, and expose a novel mechanism of lncRNA-miRNA crosstalk.
      datePublished:2017-09-30T00:00:00Z
      dateModified:2017-09-30T00:00:00Z
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      pageEnd:11
      license:http://creativecommons.org/publicdomain/zero/1.0/
      sameAs:https://doi.org/10.1186/s12943-017-0725-5
      keywords:
         miRNA biogenesis
         lncRNA-miRNA crosstalk
         cancer stem cells
         Cancer Research
         Oncology
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         name:BioMed Central
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            type:ImageObject
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      author:
            name:Yingjie Yu
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                     type:PostalAddress
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                     type:PostalAddress
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            name:Adhip P. N. Majumdar
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            address:
               name:Department of Veterans Affairs Medical Center, Detroit, USA
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               name:Department of Veterans Affairs Medical Center, Detroit, USA
               type:PostalAddress
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            address:
               name:Karmanos Cancer Institute, Detroit, USA
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            address:
               name:Department of Veterans Affairs Medical Center, Detroit, USA
               type:PostalAddress
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            name:Department of Veterans Affairs Medical Center
            address:
               name:Department of Veterans Affairs Medical Center, Detroit, USA
               type:PostalAddress
            type:Organization
            name:Karmanos Cancer Institute
            address:
               name:Karmanos Cancer Institute, Detroit, USA
               type:PostalAddress
            type:Organization
            name:Wayne State University
            address:
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               type:PostalAddress
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      email:[email protected]
PostalAddress:
      name:Department of Veterans Affairs Medical Center, Detroit, USA
      name:Departments of Internal Medicine, Wayne State University, Detroit, USA
      name:Department of Veterans Affairs Medical Center, Detroit, USA
      name:Karmanos Cancer Institute, Detroit, USA
      name:Departments of Internal Medicine, Wayne State University, Detroit, USA
      name:Department of Veterans Affairs Medical Center, Detroit, USA
      name:Departments of Internal Medicine, Wayne State University, Detroit, USA
      name:Department of Veterans Affairs Medical Center, Detroit, USA
      name:Karmanos Cancer Institute, Detroit, USA
      name:Departments of Internal Medicine, Wayne State University, Detroit, USA

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