The IkappaB kinase (IKK) inhibitor, NEMO-binding domain peptide, blocks osteoclastogenesis and bone erosion in inflammatory arthritis

The Journal of Biological Chemistry
Simon DaiY Abu-Amer

Abstract

Activation of NF-kappaB leads to expression of ample genes that regulate inflammatory and osteoclastogenic responses. The process is facilitated by induction of IkappaB kinase (IKK) complex that phosphorylates IkappaB and leads to its dissociation from the NF-kappaB complex, thus permitting activation of NF-kappaB. The IKK complex contains primarily IKKalpha, IKKbeta, and the regulatory kinase IKKgamma, also known as NEMO. NEMO regulates the IKK complex activity through its binding to carboxyl-terminal region of IKKalpha and IKKbeta, termed NEMO-binding domain (NBD). In this regard, a cell-permeable NBD peptide has been shown to block association of NEMO with the IKK complex and inhibit activation of NF-kappaB. Given the pivotal role of cytokine-induced NF-kappaB in osteoclastogenesis and inflammatory bone loss, we deduced that cell-permeable TAT-NBD peptide may hinder osteoclastogenesis and bone erosion in inflammatory arthritis. Using NBD peptides, we show that wild type, but not mutant, NBD blocks IKK activation and reduces cytokine-induced promoter and DNA binding activities of NF-kappaB and inhibits cytokine-induced osteoclast formation by osteoclast precursors. Consistent with the key role of NF-kappaB in osteoinflammator...Continue Reading

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