... articular cartilage and has beenshown to play a role in collagen cleavage in at least a subset of OA patients [5].Cathepsin O and cathepsin Z are also highly expressed genesin cartilage and, again, ... Osteoarthritis Cartilage 2009, 17:547-555.45. Nakayama Y, Nara N, Kawakita Y, Takeshima Y, Arakawa M, KatohM, Morita S, Iwatsuki K, Tanaka K, Okamoto S, Kitamura T, Seki N,Matsuda R, Matsuo ... compared with normal, with CFI, C2 and DF increas-ing and CFB decreasing. In the complement pathway, C2 ispart of the classical pathway and CFB and DF are part of the alternative pathway with...