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Smooth muscle expression of lipoma preferred partner is mediated by an alternative intronic promoter that is regulated by serum response factor/myocardin.

Artikel i vetenskaplig tidskrift
Författare Marleen MR Petit
Henrik Lindskog
Erik Larsson
Per Wasteson
Elisabet Athley
Silke Breuer
Meike Angstenberger
David Hertfelder
Erney Mattsson
Alfred Nordheim
Sven Nelander
Per Lindahl
Publicerad i Circulation research
Volym 103
Nummer/häfte 1
Sidor 61-9
ISSN 1524-4571
Publiceringsår 2008
Publicerad vid Wallenberglaboratoriet
Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi
Institutionen för medicin, avdelningen för molekylär och klinisk medicin
Sidor 61-9
Språk en
Länkar dx.doi.org/10.1161/CIRCRESAHA.108.1...
Ämnesord Aorta, Cells, Cultured, Mice, Smooth Muscle, Nuclear Proteins, Serum Response Element, Serum Response Factor
Ämneskategorier Medicinsk cellbiologi, Kardiovaskulär medicin, Medicinsk bioteknologi (med inriktning mot cellbiologi (inklusive stamcellsbiologi), molekylärbiologi, mikrobiologi, biokemi eller biofarmaci)

Sammanfattning

Lipoma preferred partner (LPP) was recently recognized as a smooth muscle marker that plays a role in smooth muscle cell migration. In this report, we focus on the transcriptional regulation of the LPP gene. In particular, we investigate whether LPP is directly regulated by serum response factor (SRF). We show that the LPP gene contains 3 evolutionarily conserved CArG boxes and that 1 of these is part of an alternative promoter in intron 2. Quantitative RT-PCR shows that this alternative promoter directs transcription specifically to smooth muscle containing tissues in vivo. By using chromatin immunoprecipitation, we demonstrate that 2 of the CArG boxes, including the promoter-associated CArG box, bind to endogenous SRF in cultured aortic smooth muscle cells. Electrophoretic mobility-shift assays show that the conserved CArG boxes bind SRF in vitro. In reporter experiments, we show that the alternative promoter has transcriptional capacity that is dependent on SRF/myocardin and that the promoter associated CArG box is required for that activity. Finally, we show by quantitative RT-PCR that the alternative promoter is strongly downregulated in SRF-deficient embryonic stem cells and in smooth muscle tissues derived from conditional SRF knockout mice. Collectively, our data demonstrate that expression of LPP in smooth muscle is mediated by an alternative promoter that is regulated by SRF/myocardin.

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