Protective protein/cathepsin A down-regulates osteoclastogenesis by associating with and degrading NF-κB p50/p65

Springer Science and Business Media LLC - Tập 27 - Trang 46-56 - 2008
Masaaki Masuhara1, Takuya Sato1, Naoto Hada1, Yoshiyuki Hakeda1
1Division of Oral Anatomy, Department of Human Development and Fostering, Meikai University School of Dentistry, Sakado, Japan

Tóm tắt

Disruption of the cooperative function balance between osteoblasts and osteoclasts causes various bone disorders, some of which are attributed to abnormal osteoclast recruitment. Osteoclast differentiation is dependent on the receptor activator of nuclear factor (NF)-κB ligand (RANKL) as well as the macrophage colony-stimulating factor. The osteoclast formation induced by cytokines requires activation of NF-κB, AP-1 and nuclear factor of activated T cells c1. However, osteoclasts are not the only cell types that express these transcription factors, suggesting that some unknown molecules specific for osteoclasts may associate with the transcription factors. Here, we explored the possibility of molecules binding directly to NF-κB and cloned protective protein/cathepsin A (PPCA) by yeast two-hybrid screening using a cDNA library of osteoclast precursors. Forced expression of PPCA with p50/p65 in HEK293 cells decreased both the level of p50/p65 proteins and the transcriptional activity. Abundant PPCA was detected in the lysosomes of the transfected HEK293 cells, but a small amount of this enzyme was also present in the cytosolic fraction. In addition, over-expression of PPCA caused the disappearance of p50/p65 in both the lysosomal and cytosolic fractions. PPCA was expressed throughout osteoclastogenesis, and the expression was slightly up-regulated by RANKL signaling. Knockdown of PPCA in osteoclast precursors with PPCA siRNA stimulated binding of nuclear proteins to oligonucleotides containing an NF-κB binding motif and increased osteoclastogenesis. Our present results indicate a novel role for PPCA in osteoclastogenesis via down-regulation of NF-κB activity and suggest a new function for PPCA as an NF-κB-degrading enzyme in addition to its known multifunctional properties.

Tài liệu tham khảo

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