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PPAR Research
Volume 2011 (2011), Article ID 867180, 9 pages
http://dx.doi.org/10.1155/2011/867180
Review Article

Thiazolidinediones on PPARγ: The Roles in Bone Remodeling

Department of Pharmacology, UT Southwestern Medical Center, Dallas, TX 75390, USA

Received 27 August 2011; Revised 4 October 2011; Accepted 5 October 2011

Academic Editor: Beata Lecka-Czernik

Copyright © 2011 Wei Wei and Yihong Wan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Thiazolidinediones (TZDs) are synthetic PPARγ (peroxisome proliferator-activated receptor gamma) agonists and a class of drugs for diabetes mellitus type 2 that can decrease blood sugar efficiently by enhancing insulin sensitivity. However, increased bone fracture risk in diabetic individuals treated with TZDs is one of the reported side effects. Recent studies show that TZDs such as rosiglitazone simultaneously inhibit osteoblast differentiation and activate osteoclast differentiation, leading to bone loss due to decreased bone formation and increased bone resorption. Furthermore, TZDs may activate PPARγ in tissues other than bone, such as the hypothalamus-pituitary-gonad (HPG) axis to indirectly regulate bone mass. This paper will focus on current new developments that implicate potential mechanisms for how PPARγ modulates skeletal homeostasis and how TZDs exert bone-loss side effects.