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Phosphoproteomic analysis of kinase-deficient mice reveals multiple TAK1 targets in osteoclast differentiation

Eriko Sumiya1, Takako Negishi-Koga2, Yusuke Nagai2

  • 1Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033, Japan; Department of Cell Signaling, Tokyo Medical and Dental University, Yushima 1-5-45, Bunkyo-ku, Tokyo, 113-8510, Japan; Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO) Program, Takayanagi Osteonetwork Project, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033, Japan.

Biochemical and Biophysical Research Communications
|June 24, 2015
PubMed

Insights

Transforming growth factor-beta activated kinase 1 (TAK1) is crucial for osteoclast differentiation. Its kinase activity regulates late-stage differentiation by controlling protein phosphorylation, impacting bone development and diseases.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Bone Biology

Background:

  • Transforming growth factor-beta activated kinase 1 (TAK1) is a MAP3K that activates AP-1 and NF-κB.
  • TAK1 is a key regulator of osteoclast differentiation, a process vital for bone remodeling.
  • Osteoclast differentiation is essential for maintaining bone homeostasis and is implicated in bone diseases.

Purpose of the Study:

  • To investigate the functional role of TAK1 kinase activity in the late stages of osteoclast differentiation in vivo.
  • To identify novel TAK1 targets involved in osteoclastogenesis.
  • To elucidate the molecular mechanisms by which TAK1 regulates osteoclast differentiation.

Main Methods:

  • Utilized Ctsk-Cre and TAK1 mutant mice (Map3k7(flox/kd)Ctsk(Cre/+)) to study TAK1 function in vivo.
  • Analyzed osteoclast differentiation, osteoclast number, and bone phenotype in genetically modified mice.
  • Performed phosphoproteomic analysis on RANKL-stimulated osteoclast precursor cells to identify TAK1 targets.

Main Results:

  • Map3k7(flox/kd)Ctsk(Cre/+) mice exhibited a severe osteopetrotic phenotype with significantly reduced osteoclast numbers.
  • RANKL-induced activation of MAPK and NF-κB pathways was impaired in the late stages of osteoclast differentiation.
  • Phosphoproteomic analysis identified multiple novel TAK1 targets regulated during osteoclastogenesis.

Conclusions:

  • TAK1 kinase activity is essential for the late stage of osteoclast differentiation in vivo.
  • TAK1 regulates osteoclastogenesis by controlling the phosphorylation status of various cellular proteins.
  • These findings highlight TAK1 as a critical regulator of bone metabolism and a potential therapeutic target for bone disorders.
Keywords:
OsteoclastOsteopetrosisPhosphoproteomeRANKLTAK1

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