Cot Kinase Promotes Ca2+ Oscillation/calcineurin-independent Osteoclastogenesis by Stabilizing NFATc1 Protein

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 2012 May 23

PMID 22615493

Citations 13

Authors

Yukiko Kuroda

Chihiro Hisatsune

Akihiro Mizutani

Naoko Ogawa

Koichi Matsuo

Katsuhiko Mikoshiba

Affiliations

Soon will be listed here.

Abstract

Osteoclasts are multinuclear bone-resorbing cells formed by the fusion of monocyte/macrophage-lineage precursor cells. Activation of the transcription factor NFATc1 (nuclear factor of activated T cells c1) by the receptor activator of NF-κB ligand (RANKL) is critical for osteoclast differentiation. In our previous report (Y. Kuroda, C. Hisatsune, T. Nakamura, K. Matsuo, and K. Mikoshiba. Proc. Natl. Acad. Sci. U. S. A. 105:8643, 2008), we demonstrated that osteoblasts induce osteoclast differentiation via Ca(2+) oscillation/calcineurin-dependent and -independent NFATc1 activation pathways; however, the mechanism underlying the latter remained unclear. Here we show that Cot, a serine/threonine kinase also known as tumor progression locus 2 (Tpl-2), directly phosphorylates all Ca(2+)/calcineurin-regulated NFAT family members (NFATc1 through NFATc4) and increases their protein levels. Moreover, Cot activity in osteoclasts was enhanced via cell-cell interaction with osteoblasts, and Cot promoted Ca(2+) oscillation/calcineurin-independent osteoclastogenesis by increasing NFATc1 stability through phosphorylation. We propose that NFAT activation in vivo occurs via phosphorylation-induced protein stabilization, even in the absence of Ca(2+) oscillation and calcineurin activity.

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