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Transcriptional regulation of flotillins by the extracellularly regulated kinases and retinoid X receptor complexes

Banning, Antje ; Ockenga, Wymke ; Finger, Fabian ; Siebrasse, Philipp ; Tikkanen, Ritva


Originalveröffentlichung: (2012) PLoS ONE, 7(9), e45514, 1-17 doi:10.1371/journal.pone.0045514
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URN: urn:nbn:de:hebis:26-opus-90719
URL: http://geb.uni-giessen.de/geb/volltexte/2012/9071/


Freie Schlagwörter (Englisch): flotillins , transcriptional regulation , ERK1/2 , retinoic acid , retinoid X receptor
Sammlung: Open Access - Publikationsfonds
Universität Justus-Liebig-Universit√§t Gie√üen
Institut: Institute of Biochemistry
Fachgebiet: Medizin
DDC-Sachgruppe: Medizin
Dokumentart: Aufsatz
Sprache: Englisch
Erstellungsjahr: 2012
Publikationsdatum: 20.11.2012
Kurzfassung auf Englisch: Flotillin-1 and flotillin-2 are important regulators of signal transduction pathways such as growth factor signaling. Flotillin expression is increased under pathological conditions such as neurodegenerative disorders and cancer. Despite their importance for signal transduction, very little is known about the transcriptional regulation of flotillins. Here, we analyzed the expression of flotillins at transcriptional level and identified flotillins as downstream targets of the mitogen activated kinases ERK1/2. The promoter activity of flotillins was increased upon growth factor stimulation in a MAPK dependent manner. Overexpression of serum response factor or early growth response gene 1 resulted in increased flotillin mRNA and protein expression. Furthermore, both promoter activity and expression of endogenous flotillins were increased upon treatment with retinoic acid or by overexpression of the retinoid X receptor and its binding partners RARa and PPAR?. Our data indicate that the expression of flotillins, which can be detected in all cultured cells, is fine-tuned in response to various external stimuli. This regulation may be critical for the outcome of signaling cascades in which flotillins are known to be involved.
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