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New Development in Osteoporosis Treatment. Reducing bone resorption by cathepsin K inhibitor and treatment of osteoporosis. Watanabe Reiko 1 , Okazaki Ryo 2 1Third Department of Medicine, Teikyo University Chiba Medical Center, Japan. 2Third Department of Medicine, Teikyo University Chiba Medical Center, Japan. pp.59-67
Published Date 2013/12/28
DOI https://doi.org/10.20837/4201401059
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 Cathepsin K is a lysosomal cysteine protease, secreted from osteoclasts. It plays a major role in the osteoclastic bone resorption by cleaving type 1 collagen, the major bone matrix protein, under acidic pH. In cathepsin K knockout mice, bone mineral density(BMD)is increased, bone resorption is decreased without reduction in the number of osteoclast whereas bone formation is decreased. Based on these results, cathepsin K inhibitors have been developed for the treatment of osteoporosis. Odanacatib is one of them and is perhaps closest for launching. In phase 1 and 2 trials, it markedly reduced bone resorption with a transient reduction in bone formation, thus resulted in a robust increase in both trabecular and cortical BMD in osteoporotics. Currently, Odanacatib is in phase 3 fracture prevention trial, of which results are anticipated in 2014.



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電子版ISSN 印刷版ISSN 0917-5857 医薬ジャーナル社

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