Reduction of Dicer impairs Schwann cell differentiation and myelination
Identifieur interne : 000565 ( Main/Exploration ); précédent : 000564; suivant : 000566Reduction of Dicer impairs Schwann cell differentiation and myelination
Auteurs : Jonathan D. Verrier [États-Unis] ; Susan Semple-Rowland [États-Unis] ; Irina Madorsky [États-Unis] ; Joseph E. Papin [États-Unis] ; Lucia Notterpek [États-Unis]Source :
- Journal of Neuroscience Research [ 0360-4012 ] ; 2010-09.
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Abstract
The process of Schwann cell myelination requires precisely coordinated gene expression. At the onset of myelination, there is an increase in the expression of differentiation‐promoting transcription factors that regulate key Schwann cell genes. Further control of myelin gene expression occurs at the posttranscriptional level and, in part, is mediated by RNA binding proteins and micro‐RNAs (miRNAs). miRNAs are small, endogenously derived RNA molecules that repress gene expression by specifically binding to their mRNA targets. In the experiments described here, we tested whether miRNAs were essential in controlling myelination by reducing the levels of Dicer, an essential endoribonuclease in miRNA biogenesis. We decreased the expression of Dicer by about 60% within Schwann cells using a lentiviral vector expressing an shRNA against Dicer. The reduced levels of Dicer led to a decrease in the steady‐state expression of selected miRNAs and of the transcription factors Oct6 and Egr2/Krox20, both of which are critical for Schwann cells differentiation and myelination. In contrast, the levels of c‐jun and Sox2 were up‐regulated by the reduction in Dicer and were associated with an increase in Schwann cell proliferation. In dorsal root ganglion cocultures, Schwann cells transduced with Dicer shRNA synthesized less myelin, which was accompanied by significant reductions in the levels of myelin basic protein and protein zero. These findings support a critical role for Dicer and miRNAs in Schwann cell differentiation and myelination. © 2010 Wiley‐Liss, Inc.
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DOI: 10.1002/jnr.22418
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Res.</title><idno type="ISSN">0360-4012</idno><idno type="eISSN">1097-4547</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2010-09">2010-09</date><biblScope unit="volume">88</biblScope><biblScope unit="issue">12</biblScope><biblScope unit="page" from="2558">2558</biblScope><biblScope unit="page" to="2568">2568</biblScope></imprint><idno type="ISSN">0360-4012</idno></series><idno type="istex">D0B060A7071F4186A88FEB8F5C6FA5FA08EA7AB4</idno><idno type="DOI">10.1002/jnr.22418</idno><idno type="ArticleID">JNR22418</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0360-4012</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Dicer</term><term>Schwann cell</term><term>micro‐RNA</term><term>myelin</term><term>myelination</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The process of Schwann cell myelination requires precisely coordinated gene expression. At the onset of myelination, there is an increase in the expression of differentiation‐promoting transcription factors that regulate key Schwann cell genes. Further control of myelin gene expression occurs at the posttranscriptional level and, in part, is mediated by RNA binding proteins and micro‐RNAs (miRNAs). miRNAs are small, endogenously derived RNA molecules that repress gene expression by specifically binding to their mRNA targets. In the experiments described here, we tested whether miRNAs were essential in controlling myelination by reducing the levels of Dicer, an essential endoribonuclease in miRNA biogenesis. We decreased the expression of Dicer by about 60% within Schwann cells using a lentiviral vector expressing an shRNA against Dicer. The reduced levels of Dicer led to a decrease in the steady‐state expression of selected miRNAs and of the transcription factors Oct6 and Egr2/Krox20, both of which are critical for Schwann cells differentiation and myelination. In contrast, the levels of c‐jun and Sox2 were up‐regulated by the reduction in Dicer and were associated with an increase in Schwann cell proliferation. In dorsal root ganglion cocultures, Schwann cells transduced with Dicer shRNA synthesized less myelin, which was accompanied by significant reductions in the levels of myelin basic protein and protein zero. These findings support a critical role for Dicer and miRNAs in Schwann cell differentiation and myelination. © 2010 Wiley‐Liss, Inc.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Floride</li></region></list><tree><country name="États-Unis"><region name="Floride"><name sortKey="Verrier, Jonathan D" sort="Verrier, Jonathan D" uniqKey="Verrier J" first="Jonathan D." last="Verrier">Jonathan D. Verrier</name></region><name sortKey="Madorsky, Irina" sort="Madorsky, Irina" uniqKey="Madorsky I" first="Irina" last="Madorsky">Irina Madorsky</name><name sortKey="Notterpek, Lucia" sort="Notterpek, Lucia" uniqKey="Notterpek L" first="Lucia" last="Notterpek">Lucia Notterpek</name><name sortKey="Papin, Joseph E" sort="Papin, Joseph E" uniqKey="Papin J" first="Joseph E." last="Papin">Joseph E. Papin</name><name sortKey="Semple Owland, Susan" sort="Semple Owland, Susan" uniqKey="Semple Owland S" first="Susan" last="Semple-Rowland">Susan Semple-Rowland</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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