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Transcription factor, nuclear factor kappaB (NF-kappaB), is required for osteoclast formation in vivo and mice lacking both of the NF-kappaB p50 and p52 proteins are osteopetrotic. Here we address the relative roles of the two catalytic subunits of the IkappaB kinase (IKK) complex that mediate NF-kappaB activation, IKKalpha and IKKbeta, in osteoclast formation and inflammation-induced bone loss. Our findings point out the importance of the IKKbeta subunit as a transducer of signals from receptor activator of NF-kappaB (RANK) to NF-kappaB. Although IKKalpha is required for RANK ligand-induced osteoclast formation in vitro, it is not needed in vivo. However, IKKbeta is required for osteoclastogenesis in vitro and in vivo. IKKbeta also protects osteoclasts and their progenitors from tumor necrosis factor alpha-induced apoptosis, and its loss in hematopoietic cells prevents inflammation-induced bone loss.

IκB kinase (IKK)β, but not IKKα, is a critical mediator of osteoclast survival and is required for inflammation-induced bone loss