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Molecular Pharmacology

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Research ArticleArticle

The Transcription Factor Fos-Related Antigen 1 Is Induced by Thiazolidinediones During Differentiation of 3T3-L1 Cells

Tatjana Albrektsen and Jan Fleckner
Molecular Pharmacology March 2001, 59 (3) 567-575; DOI: https://doi.org/10.1124/mol.59.3.567
Tatjana Albrektsen
Department of Molecular Genetics, Novo Nordisk A/S, Bagsvaerd, Denmark
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Jan Fleckner
Department of Molecular Genetics, Novo Nordisk A/S, Bagsvaerd, Denmark
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Abstract

Thiazolidinediones (TZDs) are a new class of compounds that improve the insulin sensitivity in patients with non–insulin-dependent diabetes mellitus (NIDDM) as well as in rodent models of NIDDM. These compounds act as high-affinity ligands for a member of the nuclear hormone receptor superfamily PPARγ, which has been shown to play an important role in adipocyte differentiation. The strong correlation between the antidiabetic activity of TZDs and their ability to activate PPARγ has led to suggestions that PPARγ or downstream regulated genes mediate the effects of TZDs. To identify novel genes that potentially mediate the effects of TZDs, we have isolated genes that are differentially expressed during thiazolidinedione-stimulated differentiation of 3T3-L1 cells. Using mRNA differential display, we have compared 3T3-L1 cells treated to differentiate in the presence of BRL49653 with untreated 3T3-L1 cells and identified Fos-related antigen 1 (Fra-1), a member of the Fos protein family, as a novel molecular target for BRL49653 action in 3T3-L1 cells. Analysis of all members of the Fos-Jun family of transcription factors showed that Fra-1 was the only member that was specifically up-regulated by BRL49653. The only other member of the Fos-Jun family expressed in differentiated 3T3-L1 cells was JunD and a complex of Fra-1 and JunD was formed on a consensus AP-1 binding element in differentiated 3T3-L1 cells, suggesting that the complex of Fra-1 and JunD may play a role in the stimulation of the differentiation process of 3T3-L1 cells observed after treatment of the cells with insulin sensitizers.

Footnotes

    • Received July 21, 2000.
    • Accepted October 13, 2000.
  • Send reprint requests to: Dr. Jan Fleckner, Department of Molecular Genetics, Novo Nordisk A/S, Novo Allé 6B2.83, DK-2880 Bagsværd, Denmark. Email: jafl{at}novonordisk.com

  • T.A. was supported by The Academy of Technical Science.

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 59 (3)
Molecular Pharmacology
Vol. 59, Issue 3
1 Mar 2001
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Research ArticleArticle

The Transcription Factor Fos-Related Antigen 1 Is Induced by Thiazolidinediones During Differentiation of 3T3-L1 Cells

Tatjana Albrektsen and Jan Fleckner
Molecular Pharmacology March 1, 2001, 59 (3) 567-575; DOI: https://doi.org/10.1124/mol.59.3.567

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Research ArticleArticle

The Transcription Factor Fos-Related Antigen 1 Is Induced by Thiazolidinediones During Differentiation of 3T3-L1 Cells

Tatjana Albrektsen and Jan Fleckner
Molecular Pharmacology March 1, 2001, 59 (3) 567-575; DOI: https://doi.org/10.1124/mol.59.3.567
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