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Xanthine oxidase mediates cytokine-induced, but not hormone-induced bone resorption

Kanczler, Janos M., Millar, Timothy M., Bodamyali, Tulin, Blake, David R. and Stevens, Cliff R. (2003) Xanthine oxidase mediates cytokine-induced, but not hormone-induced bone resorption Free Radical Research, 37, (2), pp. 179-187. (doi:10.1080/1071576021000040673).

Record type: Article


Reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) have been implicated as mediators of osteoclastic bone resorption. Xanthine oxidase (XO) a ubiquitous enzyme is widely known for its production of these ROS. We therefore evaluated the potential of XO as a source of ROS in cytokine-and hormone-induced bone resorption. XO activity in rat calvarial osteoblasts was found to be significantly elevated upon stimulation by the cytokines, TNFalpha and IL-1beta. These cytokines also caused a dose related increase in bone resorption of mouse calvariae, which was significantly inhibited by catalase (10 IU/ml). Allopurinol, the competitive inhibitor of XO, also caused a dose related (1-50 microM) inhibition of TNFalpha (20 ng/ml) and (0.01-10 microM) IL-1beta (50 IU/ml)-induced bone resorption, respectively. PTH- and 1,25-(OH)2 Vitamin D3-induced bone resorption could also be inhibited by catalase (100 IU/ml) but was unaffected by allopurinol, indicating that another mediator, other than XO, is required for hormone-induced bone resorption. These results demonstrate, that modulation of the redox balance in the bone microenvironment, which contains XO, can affect the bone resorbing process. Therefore, XO may play a pivotal role in cytokine-induced bone resorption and, if manipulated appropriately, could show a therapeutic benefit in inflammatory bone disorders such as RA.

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Published date: February 2003
Keywords: xanthine oxidase, bone resorption, cytokines, hydrogen peroxide


Local EPrints ID: 44322
ISSN: 1071-5762
PURE UUID: f8ecb348-c231-4a11-8829-a9130ac3faea
ORCID for Janos M. Kanczler: ORCID iD

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Date deposited: 23 Feb 2007
Last modified: 17 Jul 2017 15:15

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Author: Janos M. Kanczler ORCID iD
Author: Tulin Bodamyali
Author: David R. Blake
Author: Cliff R. Stevens

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