Mitogen‐activated protein kinase p38 regulates krox‐20 to direct schwann cell differentiation and peripheral myelination
Identifieur interne : 001400 ( Main/Exploration ); précédent : 001399; suivant : 001401Mitogen‐activated protein kinase p38 regulates krox‐20 to direct schwann cell differentiation and peripheral myelination
Auteurs : Shireen Hossain [Canada] ; Miguel-Angel De La Cruz-Morcillo [Espagne] ; Ricardo Sanchez-Prieto [Espagne] ; Guillermina Almazan [Canada]Source :
- Glia [ 0894-1491 ] ; 2012-07.
English descriptors
- KwdEn :
- CREB, MAPKAPK‐2 (MK2), MSK‐1, Sox10, p27kip1.
Abstract
We previously reported that addition of extracellular matrix (ECM) extracts to rat Schwann cell‐dorsal root ganglion neuron (DRGN) co‐cultures activated mitogen‐activated protein kinase (MAPK) p38, whereas inhibition blocked myelination. Here, we used p38 pharmacological inhibitors and gene silencing to assess their effects on downstream kinases and key transcription factors. We show that p38α regulates expression of the master transcription factor, Krox‐20, required for the onset of myelination in Schwann cell‐DRGNs, as assessed by immunocytochemistry and qRT‐PCR. p38 activity is also required for the expression of the cell cycle inhibitor p27kip1, associated with Schwann cell differentiation. Three potential effectors of p38 were explored: MAPK‐activated protein kinase‐2 (MK2), mitogen and stress‐activated protein kinase‐1 (MSK‐1), and the transcription factor cAMP response element‐binding protein (CREB). Inhibition of MK2 with CMPD1 or gene knockdown with siRNAs reduced numbers of Krox‐20‐positive Schwann cells and expression of myelin proteins MBP and MAG. ECM activated CREB and increased Krox‐20 expression, whereas CREB1 gene silencing reduced Krox‐20. Furthermore, two nonselective inhibitors of MSK‐1 (H89 and R0‐318820) decreased ECM‐induced CREB phosphorylation and, similar to anti‐MSK‐1 siRNAs, reduced Krox‐20‐positive cells. In addition, p38 modulated the expression of two transcription factors involved in the regulation of Krox‐20 [suppressed cAMP‐inducible protein (SCIP) and Sox10], but not Sox2, an antagonist of Krox‐20. Collectively, our results show that p38 primarily directs Schwann cell differentiation and peripheral myelination by regulating Krox‐20 expression through its downstream effectors, MK2 and MSK‐1/CREB, and transcription factors SCIP and Sox10. © 2012 Wiley Periodicals, Inc.
Url:
DOI: 10.1002/glia.22340
Affiliations:
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type="ISSN">0894-1491</idno></series><idno type="istex">C136718D24FE6B543EDDD482BE70D8AEABF07BF8</idno><idno type="DOI">10.1002/glia.22340</idno><idno type="ArticleID">GLIA22340</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0894-1491</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>CREB</term><term>MAPKAPK‐2 (MK2)</term><term>MSK‐1</term><term>Sox10</term><term>p27kip1</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We previously reported that addition of extracellular matrix (ECM) extracts to rat Schwann cell‐dorsal root ganglion neuron (DRGN) co‐cultures activated mitogen‐activated protein kinase (MAPK) p38, whereas inhibition blocked myelination. Here, we used p38 pharmacological inhibitors and gene silencing to assess their effects on downstream kinases and key transcription factors. We show that p38α regulates expression of the master transcription factor, Krox‐20, required for the onset of myelination in Schwann cell‐DRGNs, as assessed by immunocytochemistry and qRT‐PCR. p38 activity is also required for the expression of the cell cycle inhibitor p27kip1, associated with Schwann cell differentiation. Three potential effectors of p38 were explored: MAPK‐activated protein kinase‐2 (MK2), mitogen and stress‐activated protein kinase‐1 (MSK‐1), and the transcription factor cAMP response element‐binding protein (CREB). Inhibition of MK2 with CMPD1 or gene knockdown with siRNAs reduced numbers of Krox‐20‐positive Schwann cells and expression of myelin proteins MBP and MAG. ECM activated CREB and increased Krox‐20 expression, whereas CREB1 gene silencing reduced Krox‐20. Furthermore, two nonselective inhibitors of MSK‐1 (H89 and R0‐318820) decreased ECM‐induced CREB phosphorylation and, similar to anti‐MSK‐1 siRNAs, reduced Krox‐20‐positive cells. In addition, p38 modulated the expression of two transcription factors involved in the regulation of Krox‐20 [suppressed cAMP‐inducible protein (SCIP) and Sox10], but not Sox2, an antagonist of Krox‐20. Collectively, our results show that p38 primarily directs Schwann cell differentiation and peripheral myelination by regulating Krox‐20 expression through its downstream effectors, MK2 and MSK‐1/CREB, and transcription factors SCIP and Sox10. © 2012 Wiley Periodicals, Inc.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Espagne</li></country><region><li>Québec</li></region><settlement><li>Montréal</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="Canada"><region name="Québec"><name sortKey="Hossain, Shireen" sort="Hossain, Shireen" uniqKey="Hossain S" first="Shireen" last="Hossain">Shireen Hossain</name></region><name sortKey="Almazan, Guillermina" sort="Almazan, Guillermina" uniqKey="Almazan G" first="Guillermina" last="Almazan">Guillermina Almazan</name><name sortKey="Almazan, Guillermina" sort="Almazan, Guillermina" uniqKey="Almazan G" first="Guillermina" last="Almazan">Guillermina Almazan</name></country><country name="Espagne"><noRegion><name sortKey="De La Cruz Orcillo, Miguel Ngel" sort="De La Cruz Orcillo, Miguel Ngel" uniqKey="De La Cruz Orcillo M" first="Miguel-Angel" last="De La Cruz-Morcillo">Miguel-Angel De La Cruz-Morcillo</name></noRegion><name sortKey="Sanchez Rieto, Ricardo" sort="Sanchez Rieto, Ricardo" uniqKey="Sanchez Rieto R" first="Ricardo" last="Sanchez-Prieto">Ricardo Sanchez-Prieto</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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