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Induction of endosomal/lysosomal pathways in differentiating osteoblasts as revealed by combined proteomic and transcriptomic analyses

By Takako Taniguchi, Shinsuke Kido, Emiko Yamauchi, Masahiro Abe, Toshio Matsumoto and Hisaaki Taniguchi


AbstractWe have analyzed proteome changes associated with bone-forming osteoblast differentiation by quantitative differential proteomic and transcriptomic analyses using in vitro differentiation model. Sixty nine proteins were found up-regulated (>2-fold) and 18 were down-regulated (<0.5-fold) at protein level. The mRNA levels of these proteins were then analyzed by quantitative real-time PCR combined with clustering analysis. The most prominent cluster with increased protein and mRNA levels contains endosomal and lysosomal proteins, demonstrating the drastic induction of degradative endosomal/lysosomal pathways in osteoblasts. Osteoblasts, therefore, are involved not only in the synthesis but also in the turnover of the extracellular matrix proteins such as collagens

Publisher: Federation of European Biochemical Societies. Published by Elsevier B.V.
Year: 2010
DOI identifier: 10.1016/j.febslet.2010.07.055
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