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The glucocorticoid (GC) receptor (GR) and Kruppel-like factor Klf4 are transcription factors that play major roles in skin homeostasis. However, whether these transcription factors cooperate in binding genomic regulatory regions in epidermal keratinocytes was not known. Here, we show that in dexamethasone-treated keratinocytes GR and Klf4 are recruited to genomic regions containing adjacent GR and KLF binding motifs to control transcription of the anti-inflammatory genes Tsc22d3 and Zfp36. GR- and Klf4 loss of function experiments showed total GR but partial Klf4 requirement for full gene induction in response to dexamethasone. In wild type keratinocytes induced to differentiate, GR and Klf4 protein expression increased concomitant with Tsc22d3 and Zfp36 up-regulation. In contrast, GR-deficient cells failed to differentiate or fully induce Klf4, Tsc22d3 and Zfp36 correlating with increased expression of the epithelium-specific Trp63, a known transcriptional repressor of Klf4. The identified transcriptional cooperation between GR and Klf4 may determine cell-type specific regulation and have implications for developing therapies for skin diseases.

Original publication

DOI

10.1016/j.mce.2015.05.015

Type

Journal article

Journal

Mol Cell Endocrinol

Publication Date

05/09/2015

Volume

412

Pages

281 - 289

Keywords

Glucocorticoid receptor, Inflammation, Keratinocyte, Kruppel-like factor 4, Transcription, Animals, Base Sequence, Binding Sites, Cells, Cultured, Female, Gene Expression Regulation, Keratinocytes, Kruppel-Like Transcription Factors, Mice, Molecular Sequence Data, Phosphoproteins, Protein Isoforms, Receptors, Glucocorticoid, Trans-Activators