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Research Article

A RANKL-Inducible Gene Znf216 in Osteoclast Differentiation

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Pages 199-216 | Published online: 10 Oct 2008
 

Abstract

Osteoclasts possess catabolic activity in mineralized tissues and are involved in bone remodeling coordinating with osteoblasts. Although the pathway using receptor and activator of NF-κ B (RANK) and its ligand, RANKL, is known to be essential for osteoclast differentiation, their precise mechanisms are not fully understood. Using DNA microarray technology, we searched for genes that were up-regulated after RANKL stimulation in the macrophage cell line, RAW264.7 cells. A gene, Znf216, which encodes a zinc-finger protein, was detected among those genes up-regulated after RANKL stimulation. Expression of Znf216 was also induced by other cytokines such as TNFα and IL-1β. Although ectopic expression of full-length ZNF216 abrogated osteoclast differentiation, its truncated forms accelerated it. No significant inhibitory effect on the NF-κ B pathway was observed, however. These results suggest that ZNF216 is a potent inhibitory factor for osteoclast differentiation and that the mechanism is unlikely due to direct attenuation of the NF-κ B pathway.

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