Exp Clin Endocrinol Diabetes 2011; 119(2): 81-85
DOI: 10.1055/s-0030-1262860
Article

© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York

Stanniocalcin 1 Induction by Thyroid Hormone Depends on Thyroid Hormone Receptor β and Phosphatidylinositol 3-kinase Activation

L. C. Moeller1 , N. E. Haselhorst1 , A. M Dumitrescu2 , X. Cao4 , H. Seo4 , S. Refetoff2 , 3 , K. Mann1 , O. E. Janssen1 , 5
  • 1Department of Endocrinology and Division of Laboratory Research, University of Duisburg-Essen, Essen, Germany
  • 2Department of Medicine, The University of Chicago, Chicago, Illinois, USA
  • 3Department of Pediatrics and Committees on Genetics and Molecular Medicine, The University of Chicago, Chicago, Illinois, USA
  • 4Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan
  • 5Present Address: Endokrinologikum, Hamburg 22767, Germany
Further Information

Publication History

received 24.03.2010 first decision 28.06.2010

accepted 20.07.2010

Publication Date:
08 September 2010 (online)

Abstract

Context: Thyroid hormone (TH) mediated changes in gene expression were thought to be primarily initiated by the nuclear TH receptor (TR) binding to a thyroid hormone response element in the promoter of target genes. A recently described extranuclear mechanism of TH action consists of the association of TH-liganded TRβ with phosphatidylinositol 3-kinase (PI3K) in the cytosol and subsequent activation of the PI3K pathway.

Objective: The aim of this study was to examine the effect of TH, TRβ and PI3K on stanniocalcin 1 (STC1) expression in human cells.

Design: We treated human skin fibroblasts with triiodothyronine (T3) in the absence or presence of the PI3K inhibitor LY294002, a dominant negative PI3K subunit, Δp85α, and the protein synthesis inhibitor cycloheximide (CHX). The role of the TRβ was studied in cells from patients with resistance to thyroid hormone (RTH). STC-1 mRNA expression was measured by real-time PCR.

Results: We found an induction of STC1 by T3 in normal cells, but less in cells from subjects with RTH (2.7±0.2 vs. 1.6±0.04, P<0.01). The effect of T3 was completely abrogated by blocking PI3K with LY294002 (3.9±0.5 vs. 0.85±0.5; P<0.05) and greatly reduced after transfection of a dominant negative PI3K subunit, demonstrating dependency on the PI3K pathway.

Conclusion: These results establish STC1 as a TH target gene in humans. Furthermore, we show that STC1 induction by TH depends on both TRβ and PI3K activation.

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Correspondence

L. C. Moeller

Department of Endocrinology

University of Duisburg-Essen

Hufelandstraße 55

45122 Essen

Germany

Phone: +49/201/723 2821

Fax: +49/201/723 5187

Email: lars.moeller@uni-due.de

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