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C-TAK1 interacts with microphthalmia-associated transcription factor, Mitf, but not the related family member Tfe3.

Biochem. Biophys. Res. Commun.2010 Apr 16;394(4):890-5. Epub 2010 Mar 07
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摘要


Microphthalmia-associated transcription factor, Mitf, has been shown to be necessary for regulating genes involved in osteoclast differentiation. Previously it was shown by others that Mitf translocates from the cytoplasm to the nucleus upon M-CSF/RANKL signaling in osteoclasts. Mitf's movement is regulated by its interaction with 14-3-3 and the kinase C-TAK1. Here we demonstrate that the related family member, Tfe3, does not shuttle from the cytoplasm to the nucleus and does not interact with C-TAK1. We also demonstrate that overexpression of C-TAK1 inhibits the expression of Acp5 while a kinase dead C-TAK1 or a Mitf mutant that cannot interact with C-TAK1 increased expression of Acp5. Finally, we show that the catalytic subunit of protein phosphatase 2A is up-regulated in osteoclasts with M-CSF/RANKL signaling, indicating a possible mechanism for dephosphorylating Mitf on its 14-3-3 binding site and allowing Mitf to be translocated to the nucleus of osteoclasts.

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