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ARTICLES |
B Ligand Activates Nuclear Factor-
B in Osteoclast Precursors1
Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110
Address all correspondence and requests for reprints to: F. Patrick Ross, Ph.D., Department of Pathology, Washington University School of Medicine, Barnes-Jewish Hospital North Mail Stop #9030-669, 216 South Kingshighway, St. Louis, Missouri 63110. E-mail: rossf{at}medicine.wustl.edu
Receptor activator of nuclear factor-
B ligand [RANK ligand
(RANK-L)] stimulates mature osteoclasts to resorb bone, a process
associated with NF-
B activation. RANK-L also prompts macrophages to
develop the osteoclast phenotype. Although NF-
B is essential for
osteoclast differentiation, it is not known whether RANK-L activates
this transcription complex in osteoclast precursors. We report that
RANK-L rapidly induces NF-
B activation in both authentic osteoclast
precursors, namely bone marrow macrophages, and RAW 264.7 cells, a
murine macrophage line also capable of RANK-L-mediated
osteoclastogenesis. Supershift studies reveal the RANK-L-induced DNA
binding moiety contains p50/p65, the most common NF-
B complex.
Subcellular translocation of p50 and p65 subunits is confirmed by
Western blots and immunofluorescence analysis. RANK-L activates NF-
B
in both bone marrow macrophages and RAW 264.7 cells by serine
phosphorylation of I
B
within 5 min, resulting in rapid I
B
degradation and resynthesis. Attesting to function, RANK-L treatment of
RAW 264.7 cells transiently transfected with a plasmid containing
NF-
B consensus elements linked to luciferase greatly enhances
reporter activity. Our data suggest that activation of the NF-
B
pathway is an integral component of RANK-L-induced osteoclast
differentiation.
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