Calcified Tissue International

, 85:538

Biphasic Glucocorticoid-Dependent Regulation of Wnt Expression and Its Inhibitors in Mature Osteoblastic Cells

  • Wendy Mak
  • Xinyu Shao
  • Colin R. Dunstan
  • Markus J. Seibel
  • Hong Zhou
Article

Abstract

Glucocorticoids exert both anabolic and catabolic effects on bone. Previously, we reported that endogenous glucocorticoids control mesenchymal lineage commitment and osteoblastogenesis through regulation of Wnt signaling in osteoblasts. Here, we investigated the effects of glucocorticoids on Wnt expression in mature osteoblasts. Mature osteoblasts and their immature progenitors were separately isolated from Col2.3-GFP transgenic mice in which mature osteoblasts are identifiable through GFP expression. mRNA levels of Wnt2, Wnt2b, Wnt4, Wnt5a, Wnt10b, and Wnt11 were 4- to 12-fold higher in osteoblasts compared to their progenitors (P < 0.05). Expression of Wnt7b and Wnt10b in osteoblasts was modulated by corticosterone (CS), in a biphasic fashion with 3- to 3.5-fold upregulation at 10 nM CS (P < 0.01) and 50% downregulation at 100 nM CS (P < 0.05). CS 100 nM also increased expression of the Wnt inhibitors sFRP-1 and DKK-1 two- to threefold (P < 0.05). We conclude that the contrasting anabolic and catabolic effects of glucocorticoids on bone are, at least in part, mediated through the regulation of Wnt expression and its inhibitors in mature osteoblasts.

Keywords

Glucocorticoid Osteoblast Wnt Wnt inhibitor Hydroxysteroid dehydrogenase Col2.3-GFP mice 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Wendy Mak
    • 1
  • Xinyu Shao
    • 1
    • 2
    • 3
  • Colin R. Dunstan
    • 1
    • 4
  • Markus J. Seibel
    • 1
    • 5
  • Hong Zhou
    • 1
  1. 1.Bone Research Program, ANZAC Research InstituteThe University of SydneySydneyAustralia
  2. 2.Department of Endocrinology and MetabolismShanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai Diabetes InstituteShanghaiChina
  3. 3.Department of Endocrinology and MetabolismThe First Affiliated Hospital of Soochow UniversitySuzhouChina
  4. 4.Biomedical EngineeringThe University of SydneySydneyAustralia
  5. 5.Department of Endocrinology and MetabolismConcord Hospital and The University of SydneySydneyAustralia

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