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Correspondence to:
Dirk Müller-Wieland
The classic sterol regulatory cis element (sre-1) in the LDL receptor promoter mediates sterol regulatory element binding protein (SREBP)-binding and the effects of insulin and platelet derived growth factor (PDGF). To elucidate whether SREBP-1a and SREBP-2 play a direct role in insulin and PDGF action, stable cell lines of HepG2 deficient in either SREBP-1 or SREBP-2 were used. Transfection of these cells with the wild-type promoter fragment of the low density lipoprotein (LDL) receptor gene showed that the effects of insulin and PDGF were significantly reduced in both, SREBP-1- as well as SREBP-2-deficient cells. Insulin and PDGF action could be reconstituted again in these deficient cell lines by reintroducing SREBP-1a or SREBP-2. Preincubation of cells with either the phosphatidylinositol (PI)-3 kinase inhibitor wortmannin or the mitogen-activated protein (MAP) kinase cascade inhibitor PD 98059 showed that the latter abolished the stimulatory effects of insulin and PDGF on LDL receptor promoter activity completely, whereas wortmannin had no effect. Overexpression of upstream activators of the MAP kinases, like MEKK1 or MEK1, stimulated LDL receptor promoter activity several fold in an sre-1 related manner. These effects could be enhanced by coexpression of the transcriptional active N-terminal domains of SREBP-1a and SREBP-2. Using the heterologous Gal-4 system, we could show that intracellular activation of the MAP kinase cascade by ectopic expression of MEKK1 or MEK1 has a direct stimulatory effect on the transcriptional activity of SREBP-1a and SREBP-2. Experimental evidence for a direct link between MAP kinases and SREBPs was obtained due to the MAP kinases ERK1 and ERK2 phosphorylating recombinant GST-fusion proteins of SREBP-1a and SREBP-2, in vitro.
We conclude that SREBP-1a and SREBP-2 mediate different regulatory effects converging at sre-1 and that they appear to be linked to the MAP kinase cascade, possibly being direct substrates of ERK1 and ERK2.—Kotzka, J., D. Müller-Wieland, G. Roth, L. Kremer, M. Munck, S. Schürmann, B. Knebel, and W. Krone. Sterol regulatory element binding proteins (SREBP)-1a and SREBP-2 are linked to the MAP-kinase cascade. J. Lipid Res. 2000. 41: 99;–108.
Supplementary key words:
SREBPs, MAP kinase cascade, transcription factors, insulin, growth factors
Copyright © 2000 by Lipid Research, Inc.
Original Article
Sterol regulatory element binding proteins (SREBP)-1a and SREBP-2 are linked to the MAP-kinase cascade
Jörg Kotzkaa,
Dirk Müller-Wielanda,
Gunther Rotha,
Lorena Kremera,
Martina Muncka,
Sandra Schürmanna,
Birgit Knebela, and
Wilhelm Kronea
a Klinik II und Poliklinik für Innere Medizin at the Center of Molecular Medicine Cologne, D-50924 Cologne, Germany
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