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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Otero, Jesse E. Abu-amer, Yousef Foglia, Domenica Pasparakis, Manolis Alhawagri, Muhammad Vacher, Jean Dai, Simon |
| Description | Author Affiliation: Otero JE ( Department of Orthedic Surgery, Washington University School of Medicine, St. Louis, Missouri 63110, USA.) |
| Abstract | It has been reported previously that inhibitory kappaB kinase (IKK) supports osteoclastogenesis through NF-kappaB-mediated prevention of apoptosis. This finding suggests that the ligand for receptor activator of NF-kappaB (RANKL), the master osteoclastogenic cytokine, induces apoptosis of osteoclast precursors (OCPs) in the absence of IKKbeta/NF-kappaB competency. To validate this hypothesis, we sought to determine the pro-apoptotic signaling factors induced by RANKL in IKKbeta-null osteoclast OCPs and to rescue osteoclast differentiation in the absence of IKKbeta through their inhibition. To accomplish this, we generated mice that lack IKKbeta in multiple hematopoietic lineages, including OCPs. We found that these mice possess both in vitro and in vivo defects in osteoclast generation, in concurrence with previous reports, and that this defect is a result of susceptibility to RANKL-mediated apoptosis as a result of gain-of-function of JNK activation. We demonstrate that differentiation of OCPs depends on IKKbeta because reduced IKKbeta mRNA expression correlates with impaired induction of osteoclast differentiation markers in response to RANKL stimulation. We further show that fine-tuned inhibition of JNK activation in these cells inhibits RANKL-induced apoptosis and restores the ability of IKKbeta-null OCPs to become mature osteoclasts. Our data highlight the pro-osteoclastogenic and anti-apoptotic roles of IKKbeta in OCPs and identify a pro-apoptotic mechanism activated within the RANK signalosome. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 36 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-09-05 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Apoptosis Physiology Cell Differentiation I-kappa B Kinase Metabolism MAP Kinase Kinase 4 Osteoclasts RANK Ligand Stem Cells Animals Antigens, Differentiation Biosynthesis Enzyme Activation Genetics Gene Expression Regulation Mice Mice, Transgenic Cytology Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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