1 Ocak 2010 Dergi makalesi Açık Erişim

Alotaibi, Hani; Yaman, Elif; Salvatore, Domenico; Di Dato, Valeria; Telkoparan, Pelin; Di Lauro, Roberto; Tazebay, Uygar H.

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    <subfield code="a">Intronic elements in the Na+/I- symporter gene (NIS) interact with retinoic acid receptors and mediate initiation of transcription</subfield>
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    <subfield code="a">Activity of the sodium/iodide symporter (NIS) in lactating breast is essential for iodide (I(-)) accumulation in milk. Significant NIS upregulation was also reported in breast cancer, indicating a potential use of radioiodide treatment. All-trans-retinoic acid (tRA) is a potent ligand that enhances NIS expression in a subset of breast cancer cell lines and in experimental breast cancer models. Indirect tRA stimulation of NIS in breast cancer cells is very well documented; however, direct upregulation by tRA-activated nuclear receptors has not been identified yet. Aiming to uncover cis-acting elements directly regulating NIS expression, we screened evolutionary-conserved non-coding genomic sequences for responsiveness to tRA in MCF-7. Here, we report that a potent enhancer in the first intron of NIS mediates direct regulation by tRA-stimulated nuclear receptors. In vitro as well as in vivo DNA-protein interaction assays revealed direct association between retinoic acid receptor-a (RAR alpha) and retinoid-X-receptor (RXR) with this enhancer. Moreover, using chromatin immunoprecipitation (ChIP) we uncovered early events of NIS transcription in response to tRA, which require the interaction of several novel intronic tRA responsive elements. These findings indicate a complex interplay between nuclear receptors, RNA Pol-II and multiple intronic RAREs in NIS gene, and they establish a novel mechanistic model for tRA-induced gene transcription.</subfield>
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    <subfield code="u">Bilkent Univ, Dept Mol Biol &amp; Genet, TR-06800 Ankara, Turkey</subfield>
    <subfield code="a">Yaman, Elif</subfield>
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    <subfield code="u">Univ Naples Federico 2, Dept Endocrinol &amp; Mol &amp; Clin Oncol, I-80131 Naples, Italy</subfield>
    <subfield code="a">Salvatore, Domenico</subfield>
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    <subfield code="a">Tazebay, Uygar H.</subfield>
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    <subfield code="a">Alotaibi, Hani</subfield>
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