Gout Clinical Trial
Official title:
Denosumab In Addition To Intense Urate-Lowering Therapy for Bone Erosions in Gout: A Pilot Study
Bone erosions are a common manifestation and feature of structural damage in severe/chronic tophaceous gout. Management of this destructive and often debilitating gout complication has focused exclusively on urate-lowering therapy (ULT) to reduce frequency of gout attacks, but little attention has been given to prevention or reversal of gout related bone erosions and other structural damage to bone caused by gout. Since there is no known effective treatment to attenuate or improve structural damage caused by gout, we propose a pilot, controlled, proof-of-concept study in which denosumab, an FDA approved medication for the treatment of bone loss, will be added to standard ULT in 20 patients with erosive gout.
A recently published clinical trial with zoledronic acid failed to show an effect in improving bone erosions among individuals with chronic tophaceous gout, despite improvements in bone mineral density (BMD) and bone turnover markers. However, it is known that increased numbers of osteoclasts (cells that absorb bone tissue during growth and healing) in patients with tophaceous gout are most likely a result of enhanced osteoclast activity as these patients also have higher circulating levels of the protein receptor activator of nuclear factor kappa-B ligand (RANKL). RANKL has been identified to affect the immune system and control bone regeneration and remodeling. Furthermore, peripheral blood cells and synovial fluid cells taken from patients with erosive gout preferentially formed osteoclast-like cells in the presence of RANKL. The number of osteoclasts formed significantly correlates with the number of tophi in gout patients. Denosumab (Prolia®) is a fully human monoclonal antibody with a high affinity for RANKL that can bind and neutralize the activity of human RANKL. Given the relevance of RANKL in the mechanism of gouty erosions,a central hypothesis of this pilot study is that denosumab is more likely to precisely target RANKL and the mechanism of gouty erosions than zoledronic acid. ;
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