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Targeting Protein Kinases for Bone Disease: Discovery and Development of Src Inhibitors

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The dynamic and highly regulated processes of bone remodeling involve two major cells, osteoclasts and osteoblasts, both of which command a multitude of cellular signaling pathways involving protein kinases. Of the possible kinases in these cells, Src tyrosine kinase stands out as a promising therapeutic target for bone disease as validated by Src knockout mouse studies and in vitro cellular experiments, suggesting a regulatory role for Src in both osteoclasts (positive) and osteoblasts (negative). Advances in structural studies involving both Src and non-Src family kinases, in activated and unactivated protein states, have uncovered key binding site interactions that have led to the design of potent Src inhibitors. The lead compounds originate from a variety of synthetic templates and have demonstrated nM potency in enzymatic / binding assays and efficacy in animal models of bone disease. This review will provide a current understanding of critical Src signalling pathways in osteoclasts and osteoblasts, while detailing the structure-based design and screening-based lead discovery of Src inhibitors to be developed as therapeutic agents for bone disease.
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Keywords: bone; osteoporosis; protein kinase; src inhibitor

Document Type: Review Article

Affiliations: ARIAD Pharmaceuticals, Inc., 26 Landsdowne Street, Cambridge MA 02139-4234, USA.

Publication date: January 1, 2004

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